Merge tag 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

Pull UML updates from Richard Weinberger:
 - hostfs saw a face lifting
 - old/broken stuff was removed (SMP, HIGHMEM, SKAS3/4)
 - random cleanups and bug fixes

* tag 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: (26 commits)
  um: Print minimum physical memory requirement
  um: Move uml_postsetup in the init_thread stack
  um: add a kmsg_dumper
  x86, UML: fix integer overflow in ELF_ET_DYN_BASE
  um: hostfs: Reduce number of syscalls in readdir
  um: Remove broken highmem support
  um: Remove broken SMP support
  um: Remove SKAS3/4 support
  um: Remove ppc cruft
  um: Remove ia64 cruft
  um: Remove dead code from stacktrace
  hostfs: No need to box and later unbox the file mode
  hostfs: Use page_offset()
  hostfs: Set page flags in hostfs_readpage() correctly
  hostfs: Remove superfluous initializations in hostfs_open()
  hostfs: hostfs_open: Reset open flags upon each retry
  hostfs: Remove superfluous test in hostfs_open()
  hostfs: Report append flag in ->show_options()
  hostfs: Use __getname() in follow_link
  hostfs: Remove open coded strcpy()
  ...

arch/um/Kconfig.um

@@ -95,48 +95,6 @@ config MAGIC_SYSRQ
 	  The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
 	  unless you really know what this hack does.
 
-config SMP
-	bool "Symmetric multi-processing support"
-	default n
-	depends on BROKEN
-	help
-	  This option enables UML SMP support.
-	  It is NOT related to having a real SMP box. Not directly, at least.
-
-	  UML implements virtual SMP by allowing as many processes to run
-	  simultaneously on the host as there are virtual processors configured.
-
-	  Obviously, if the host is a uniprocessor, those processes will
-	  timeshare, but, inside UML, will appear to be running simultaneously.
-	  If the host is a multiprocessor, then UML processes may run
-	  simultaneously, depending on the host scheduler.
-
-	  This, however, is supported only in TT mode. So, if you use the SKAS
-	  patch on your host, switching to TT mode and enabling SMP usually
-	  gives	you worse performances.
-	  Also, since the support for SMP has been under-developed, there could
-	  be some bugs being exposed by enabling SMP.
-
-	  If you don't know what to do, say N.
-
-config NR_CPUS
-	int "Maximum number of CPUs (2-32)"
-	range 2 32
-	depends on SMP
-	default "32"
-
-config HIGHMEM
-	bool "Highmem support"
-	depends on !64BIT && BROKEN
-	default n
-	help
-	  This was used to allow UML to run with big amounts of memory.
-	  Currently it is unstable, so if unsure say N.
-
-	  To use big amounts of memory, it is recommended enable static
-	  linking (i.e. CONFIG_STATIC_LINK) - this should allow the
-	  guest to use up to 2.75G of memory.
-
 config KERNEL_STACK_ORDER
 	int "Kernel stack size order"
 	default 1 if 64BIT

arch/um/Makefile-ia64

@@ -1 +0,0 @@
-START_ADDR = 0x1000000000000000

arch/um/Makefile-ppc

@@ -1,9 +0,0 @@
-ifeq ($(CONFIG_HOST_2G_2G), y)
-START_ADDR = 0x80000000
-else
-START_ADDR = 0xc0000000
-endif
-ARCH_CFLAGS = -U__powerpc__ -D__UM_PPC__
-
-# The arch is ppc, but the elf32 name is powerpc
-ELF_SUBARCH = powerpc

arch/um/include/asm/fixmap.h

@@ -33,10 +33,6 @@
  * fix-mapped?
  */
 enum fixed_addresses {
-#ifdef CONFIG_HIGHMEM
-	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
-	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
-#endif
 	__end_of_fixed_addresses
 };
 

arch/um/include/asm/pgtable.h

@@ -47,11 +47,7 @@ extern unsigned long end_iomem;
 #define VMALLOC_OFFSET	(__va_space)
 #define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
 #define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
-#ifdef CONFIG_HIGHMEM
-# define VMALLOC_END	(PKMAP_BASE-2*PAGE_SIZE)
-#else
-# define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)
-#endif
+#define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)
 #define MODULES_VADDR	VMALLOC_START
 #define MODULES_END	VMALLOC_END
 #define MODULES_LEN	(MODULES_VADDR - MODULES_END)

arch/um/include/asm/processor-generic.h

@@ -98,16 +98,8 @@ struct cpuinfo_um {
 
 extern struct cpuinfo_um boot_cpu_data;
 
-#define my_cpu_data		cpu_data[smp_processor_id()]
-
-#ifdef CONFIG_SMP
-extern struct cpuinfo_um cpu_data[];
-#define current_cpu_data cpu_data[smp_processor_id()]
-#else
 #define cpu_data (&boot_cpu_data)
 #define current_cpu_data boot_cpu_data
-#endif
-
 
 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 extern unsigned long get_wchan(struct task_struct *p);

arch/um/include/asm/smp.h

@@ -1,32 +1,6 @@
 #ifndef __UM_SMP_H
 #define __UM_SMP_H
 
-#ifdef CONFIG_SMP
-
-#include <linux/bitops.h>
-#include <asm/current.h>
-#include <linux/cpumask.h>
-
-#define raw_smp_processor_id() (current_thread->cpu)
-
-#define cpu_logical_map(n) (n)
-#define cpu_number_map(n) (n)
-extern int hard_smp_processor_id(void);
-#define NO_PROC_ID -1
-
-extern int ncpus;
-
-
-static inline void smp_cpus_done(unsigned int maxcpus)
-{
-}
-
-extern struct task_struct *idle_threads[NR_CPUS];
-
-#else
-
 #define hard_smp_processor_id()		0
 
 #endif
-
-#endif

arch/um/include/shared/as-layout.h

@@ -56,6 +56,7 @@ extern unsigned long brk_start;
 extern unsigned long host_task_size;
 
 extern int linux_main(int argc, char **argv);
+extern void uml_finishsetup(void);
 
 struct siginfo;
 extern void (*sig_info[])(int, struct siginfo *si, struct uml_pt_regs *);

arch/um/include/shared/os.h

@@ -174,7 +174,6 @@ extern unsigned long long os_makedev(unsigned major, unsigned minor);
 
 /* start_up.c */
 extern void os_early_checks(void);
-extern void can_do_skas(void);
 extern void os_check_bugs(void);
 extern void check_host_supports_tls(int *supports_tls, int *tls_min);
 
@@ -187,7 +186,6 @@ extern int os_process_parent(int pid);
 extern void os_stop_process(int pid);
 extern void os_kill_process(int pid, int reap_child);
 extern void os_kill_ptraced_process(int pid, int reap_child);
-extern long os_ptrace_ldt(long pid, long addr, long data);
 
 extern int os_getpid(void);
 extern int os_getpgrp(void);

arch/um/include/shared/skas/proc_mm.h

@@ -1,44 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SKAS_PROC_MM_H
-#define __SKAS_PROC_MM_H
-
-#define MM_MMAP 54
-#define MM_MUNMAP 55
-#define MM_MPROTECT 56
-#define MM_COPY_SEGMENTS 57
-
-struct mm_mmap {
-	unsigned long addr;
-	unsigned long len;
-	unsigned long prot;
-	unsigned long flags;
-	unsigned long fd;
-	unsigned long offset;
-};
-
-struct mm_munmap {
-	unsigned long addr;
-	unsigned long len;
-};
-
-struct mm_mprotect {
-	unsigned long addr;
-	unsigned long len;
-	unsigned int prot;
-};
-
-struct proc_mm_op {
-	int op;
-	union {
-		struct mm_mmap mmap;
-		struct mm_munmap munmap;
-	        struct mm_mprotect mprotect;
-		int copy_segments;
-	} u;
-};
-
-#endif

arch/um/include/shared/skas/skas.h

@@ -9,13 +9,10 @@
 #include <sysdep/ptrace.h>
 
 extern int userspace_pid[];
-extern int proc_mm, ptrace_faultinfo, ptrace_ldt;
-extern int skas_needs_stub;
 
 extern int user_thread(unsigned long stack, int flags);
 extern void new_thread_handler(void);
 extern void handle_syscall(struct uml_pt_regs *regs);
-extern int new_mm(unsigned long stack);
 extern long execute_syscall_skas(void *r);
 extern unsigned long current_stub_stack(void);
 

arch/um/include/shared/skas_ptrace.h

@@ -1,14 +0,0 @@
-/* 
- * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#ifndef __SKAS_PTRACE_H
-#define __SKAS_PTRACE_H
-
-#define PTRACE_FAULTINFO 52
-#define PTRACE_SWITCH_MM 55
-
-#include <sysdep/skas_ptrace.h>
-
-#endif

arch/um/kernel/Makefile

@@ -12,8 +12,8 @@ clean-files :=
 
 obj-y = config.o exec.o exitcode.o irq.o ksyms.o mem.o \
 	physmem.o process.o ptrace.o reboot.o sigio.o \
-	signal.o smp.o syscall.o sysrq.o time.o tlb.o trap.o \
-	um_arch.o umid.o maccess.o skas/
+	signal.o syscall.o sysrq.o time.o tlb.o trap.o \
+	um_arch.o umid.o maccess.o kmsg_dump.o skas/
 
 obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
 obj-$(CONFIG_GPROF)	+= gprof_syms.o

arch/um/kernel/irq.c

@@ -35,9 +35,6 @@ void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
 	struct irq_fd *irq_fd;
 	int n;
 
-	if (smp_sigio_handler())
-		return;
-
 	while (1) {
 		n = os_waiting_for_events(active_fds);
 		if (n <= 0) {

arch/um/kernel/kmsg_dump.c

@@ -0,0 +1,43 @@
+#include <linux/kmsg_dump.h>
+#include <linux/console.h>
+#include <shared/init.h>
+#include <shared/kern.h>
+#include <os.h>
+
+static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
+				enum kmsg_dump_reason reason)
+{
+	static char line[1024];
+
+	size_t len = 0;
+	bool con_available = false;
+
+	/* only dump kmsg when no console is available */
+	if (!console_trylock())
+		return;
+
+	if (console_drivers != NULL)
+		con_available = true;
+
+	console_unlock();
+
+	if (con_available == true)
+		return;
+
+	printf("kmsg_dump:\n");
+	while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) {
+		line[len] = '\0';
+		printf("%s", line);
+	}
+}
+
+static struct kmsg_dumper kmsg_dumper = {
+	.dump = kmsg_dumper_stdout
+};
+
+int __init kmsg_dumper_stdout_init(void)
+{
+	return kmsg_dump_register(&kmsg_dumper);
+}
+
+__uml_postsetup(kmsg_dumper_stdout_init);

arch/um/kernel/mem.c

@@ -38,19 +38,6 @@ int kmalloc_ok = 0;
 /* Used during early boot */
 static unsigned long brk_end;
 
-#ifdef CONFIG_HIGHMEM
-static void setup_highmem(unsigned long highmem_start,
-			  unsigned long highmem_len)
-{
-	unsigned long highmem_pfn;
-	int i;
-
-	highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT;
-	for (i = 0; i < highmem_len >> PAGE_SHIFT; i++)
-		free_highmem_page(&mem_map[highmem_pfn + i]);
-}
-#endif
-
 void __init mem_init(void)
 {
 	/* clear the zero-page */
@@ -67,9 +54,6 @@ void __init mem_init(void)
 	/* this will put all low memory onto the freelists */
 	free_all_bootmem();
 	max_low_pfn = totalram_pages;
-#ifdef CONFIG_HIGHMEM
-	setup_highmem(end_iomem, highmem);
-#endif
 	max_pfn = totalram_pages;
 	mem_init_print_info(NULL);
 	kmalloc_ok = 1;
@@ -127,49 +111,6 @@ static void __init fixrange_init(unsigned long start, unsigned long end,
 	}
 }
 
-#ifdef CONFIG_HIGHMEM
-pte_t *kmap_pte;
-pgprot_t kmap_prot;
-
-#define kmap_get_fixmap_pte(vaddr)					\
-	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\
-				     (vaddr)), (vaddr))
-
-static void __init kmap_init(void)
-{
-	unsigned long kmap_vstart;
-
-	/* cache the first kmap pte */
-	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
-	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
-
-	kmap_prot = PAGE_KERNEL;
-}
-
-static void __init init_highmem(void)
-{
-	pgd_t *pgd;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte;
-	unsigned long vaddr;
-
-	/*
-	 * Permanent kmaps:
-	 */
-	vaddr = PKMAP_BASE;
-	fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
-
-	pgd = swapper_pg_dir + pgd_index(vaddr);
-	pud = pud_offset(pgd, vaddr);
-	pmd = pmd_offset(pud, vaddr);
-	pte = pte_offset_kernel(pmd, vaddr);
-	pkmap_page_table = pte;
-
-	kmap_init();
-}
-#endif /* CONFIG_HIGHMEM */
-
 static void __init fixaddr_user_init( void)
 {
 #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
@@ -211,9 +152,6 @@ void __init paging_init(void)
 
 	zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) -
 		(uml_physmem >> PAGE_SHIFT);
-#ifdef CONFIG_HIGHMEM
-	zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT;
-#endif
 	free_area_init(zones_size);
 
 	/*
@@ -224,10 +162,6 @@ void __init paging_init(void)
 	fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
 
 	fixaddr_user_init();
-
-#ifdef CONFIG_HIGHMEM
-	init_highmem();
-#endif
 }
 
 /*

arch/um/kernel/physmem.c

@@ -57,22 +57,51 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
 
 extern int __syscall_stub_start;
 
+/**
+ * setup_physmem() - Setup physical memory for UML
+ * @start:	Start address of the physical kernel memory,
+ *		i.e start address of the executable image.
+ * @reserve_end:	end address of the physical kernel memory.
+ * @len:	Length of total physical memory that should be mapped/made
+ *		available, in bytes.
+ * @highmem:	Number of highmem bytes that should be mapped/made available.
+ *
+ * Creates an unlinked temporary file of size (len + highmem) and memory maps
+ * it on the last executable image address (uml_reserved).
+ *
+ * The offset is needed as the length of the total physical memory
+ * (len + highmem) includes the size of the memory used be the executable image,
+ * but the mapped-to address is the last address of the executable image
+ * (uml_reserved == end address of executable image).
+ *
+ * The memory mapped memory of the temporary file is used as backing memory
+ * of all user space processes/kernel tasks.
+ */
 void __init setup_physmem(unsigned long start, unsigned long reserve_end,
 			  unsigned long len, unsigned long long highmem)
 {
 	unsigned long reserve = reserve_end - start;
-	int pfn = PFN_UP(__pa(reserve_end));
-	int delta = (len - reserve) >> PAGE_SHIFT;
-	int err, offset, bootmap_size;
+	unsigned long pfn = PFN_UP(__pa(reserve_end));
+	unsigned long delta = (len - reserve) >> PAGE_SHIFT;
+	unsigned long offset, bootmap_size;
+	long map_size;
+	int err;
+
+	offset = uml_reserved - uml_physmem;
+	map_size = len - offset;
+	if(map_size <= 0) {
+		printf("Too few physical memory! Needed=%d, given=%d\n",
+		       offset, len);
+		exit(1);
+	}
 
 	physmem_fd = create_mem_file(len + highmem);
 
-	offset = uml_reserved - uml_physmem;
 	err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
-			    len - offset, 1, 1, 1);
+			    map_size, 1, 1, 1);
 	if (err < 0) {
 		printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
-		       "failed - errno = %d\n", len - offset,
+		       "failed - errno = %d\n", map_size,
 		       (void *) uml_reserved, err);
 		exit(1);
 	}

arch/um/kernel/process.c

@@ -259,17 +259,6 @@ int strlen_user_proc(char __user *str)
 	return strlen_user(str);
 }
 
-int smp_sigio_handler(void)
-{
-#ifdef CONFIG_SMP
-	int cpu = current_thread_info()->cpu;
-	IPI_handler(cpu);
-	if (cpu != 0)
-		return 1;
-#endif
-	return 0;
-}
-
 int cpu(void)
 {
 	return current_thread_info()->cpu;

arch/um/kernel/ptrace.c

@@ -8,9 +8,6 @@
 #include <linux/sched.h>
 #include <linux/tracehook.h>
 #include <asm/uaccess.h>
-#include <skas_ptrace.h>
-
-
 
 void user_enable_single_step(struct task_struct *child)
 {
@@ -104,35 +101,6 @@ long arch_ptrace(struct task_struct *child, long request,
 		ret = ptrace_set_thread_area(child, addr, vp);
 		break;
 
-	case PTRACE_FAULTINFO: {
-		/*
-		 * Take the info from thread->arch->faultinfo,
-		 * but transfer max. sizeof(struct ptrace_faultinfo).
-		 * On i386, ptrace_faultinfo is smaller!
-		 */
-		ret = copy_to_user(p, &child->thread.arch.faultinfo,
-				   sizeof(struct ptrace_faultinfo)) ?
-			-EIO : 0;
-		break;
-	}
-
-#ifdef PTRACE_LDT
-	case PTRACE_LDT: {
-		struct ptrace_ldt ldt;
-
-		if (copy_from_user(&ldt, p, sizeof(ldt))) {
-			ret = -EIO;
-			break;
-		}
-
-		/*
-		 * This one is confusing, so just punt and return -EIO for
-		 * now
-		 */
-		ret = -EIO;
-		break;
-	}
-#endif
 	default:
 		ret = ptrace_request(child, request, addr, data);
 		if (ret == -EIO)

arch/um/kernel/reboot.c

@@ -15,28 +15,21 @@ void (*pm_power_off)(void);
 
 static void kill_off_processes(void)
 {
-	if (proc_mm)
-		/*
-		 * FIXME: need to loop over userspace_pids
-		 */
-		os_kill_ptraced_process(userspace_pid[0], 1);
-	else {
-		struct task_struct *p;
-		int pid;
-
-		read_lock(&tasklist_lock);
-		for_each_process(p) {
-			struct task_struct *t;
-
-			t = find_lock_task_mm(p);
-			if (!t)
-				continue;
-			pid = t->mm->context.id.u.pid;
-			task_unlock(t);
-			os_kill_ptraced_process(pid, 1);
-		}
-		read_unlock(&tasklist_lock);
+	struct task_struct *p;
+	int pid;
+
+	read_lock(&tasklist_lock);
+	for_each_process(p) {
+		struct task_struct *t;
+
+		t = find_lock_task_mm(p);
+		if (!t)
+			continue;
+		pid = t->mm->context.id.u.pid;
+		task_unlock(t);
+		os_kill_ptraced_process(pid, 1);
 	}
+	read_unlock(&tasklist_lock);
 }
 
 void uml_cleanup(void)

arch/um/kernel/skas/mmu.c

@@ -54,35 +54,22 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
 	unsigned long stack = 0;
 	int ret = -ENOMEM;
 
-	if (skas_needs_stub) {
-		stack = get_zeroed_page(GFP_KERNEL);
-		if (stack == 0)
-			goto out;
-	}
+	stack = get_zeroed_page(GFP_KERNEL);
+	if (stack == 0)
+		goto out;
 
 	to_mm->id.stack = stack;
 	if (current->mm != NULL && current->mm != &init_mm)
 		from_mm = &current->mm->context;
 
-	if (proc_mm) {
-		ret = new_mm(stack);
-		if (ret < 0) {
-			printk(KERN_ERR "init_new_context_skas - "
-			       "new_mm failed, errno = %d\n", ret);
-			goto out_free;
-		}
-		to_mm->id.u.mm_fd = ret;
-	}
-	else {
-		if (from_mm)
-			to_mm->id.u.pid = copy_context_skas0(stack,
-							     from_mm->id.u.pid);
-		else to_mm->id.u.pid = start_userspace(stack);
-
-		if (to_mm->id.u.pid < 0) {
-			ret = to_mm->id.u.pid;
-			goto out_free;
-		}
+	if (from_mm)
+		to_mm->id.u.pid = copy_context_skas0(stack,
+						     from_mm->id.u.pid);
+	else to_mm->id.u.pid = start_userspace(stack);
+
+	if (to_mm->id.u.pid < 0) {
+		ret = to_mm->id.u.pid;
+		goto out_free;
 	}
 
 	ret = init_new_ldt(to_mm, from_mm);
@@ -105,9 +92,6 @@ void uml_setup_stubs(struct mm_struct *mm)
 {
 	int err, ret;
 
-	if (!skas_needs_stub)
-		return;
-
 	ret = init_stub_pte(mm, STUB_CODE,
 			    (unsigned long) &__syscall_stub_start);
 	if (ret)
@@ -154,25 +138,19 @@ void destroy_context(struct mm_struct *mm)
 {
 	struct mm_context *mmu = &mm->context;
 
-	if (proc_mm)
-		os_close_file(mmu->id.u.mm_fd);
-	else {
-		/*
-		 * If init_new_context wasn't called, this will be
-		 * zero, resulting in a kill(0), which will result in the
-		 * whole UML suddenly dying.  Also, cover negative and
-		 * 1 cases, since they shouldn't happen either.
-		 */
-		if (mmu->id.u.pid < 2) {
-			printk(KERN_ERR "corrupt mm_context - pid = %d\n",
-			       mmu->id.u.pid);
-			return;
-		}
-		os_kill_ptraced_process(mmu->id.u.pid, 1);
+	/*
+	 * If init_new_context wasn't called, this will be
+	 * zero, resulting in a kill(0), which will result in the
+	 * whole UML suddenly dying.  Also, cover negative and
+	 * 1 cases, since they shouldn't happen either.
+	 */
+	if (mmu->id.u.pid < 2) {
+		printk(KERN_ERR "corrupt mm_context - pid = %d\n",
+		       mmu->id.u.pid);
+		return;
 	}
+	os_kill_ptraced_process(mmu->id.u.pid, 1);
 
-	if (skas_needs_stub)
-		free_page(mmu->id.stack);
-
+	free_page(mmu->id.stack);
 	free_ldt(mmu);
 }

arch/um/kernel/skas/process.c

@@ -10,25 +10,6 @@
 #include <os.h>
 #include <skas.h>
 
-int new_mm(unsigned long stack)
-{
-	int fd, err;
-
-	fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
-	if (fd < 0)
-		return fd;
-
-	if (skas_needs_stub) {
-		err = map_stub_pages(fd, STUB_CODE, STUB_DATA, stack);
-		if (err) {
-			os_close_file(fd);
-			return err;
-		}
-	}
-
-	return fd;
-}
-
 extern void start_kernel(void);
 
 static int __init start_kernel_proc(void *unused)
@@ -40,9 +21,7 @@ static int __init start_kernel_proc(void *unused)
 
 	cpu_tasks[0].pid = pid;
 	cpu_tasks[0].task = current;
-#ifdef CONFIG_SMP
-	init_cpu_online(get_cpu_mask(0));
-#endif
+
 	start_kernel();
 	return 0;
 }
@@ -55,14 +34,6 @@ int __init start_uml(void)
 {
 	stack_protections((unsigned long) &cpu0_irqstack);
 	set_sigstack(cpu0_irqstack, THREAD_SIZE);
-	if (proc_mm) {
-		userspace_pid[0] = start_userspace(0);
-		if (userspace_pid[0] < 0) {
-			printf("start_uml - start_userspace returned %d\n",
-			       userspace_pid[0]);
-			exit(1);
-		}
-	}
 
 	init_new_thread_signals();
 

arch/um/kernel/smp.c

@@ -1,238 +0,0 @@
-/*
- * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#include <linux/percpu.h>
-#include <asm/pgalloc.h>
-#include <asm/tlb.h>
-
-#ifdef CONFIG_SMP
-
-#include <linux/sched.h>
-#include <linux/module.h>
-#include <linux/threads.h>
-#include <linux/interrupt.h>
-#include <linux/err.h>
-#include <linux/hardirq.h>
-#include <asm/smp.h>
-#include <asm/processor.h>
-#include <asm/spinlock.h>
-#include <kern.h>
-#include <irq_user.h>
-#include <os.h>
-
-/* Per CPU bogomips and other parameters
- * The only piece used here is the ipi pipe, which is set before SMP is
- * started and never changed.
- */
-struct cpuinfo_um cpu_data[NR_CPUS];
-
-/* A statistic, can be a little off */
-int num_reschedules_sent = 0;
-
-/* Not changed after boot */
-struct task_struct *idle_threads[NR_CPUS];
-
-void smp_send_reschedule(int cpu)
-{
-	os_write_file(cpu_data[cpu].ipi_pipe[1], "R", 1);
-	num_reschedules_sent++;
-}
-
-void smp_send_stop(void)
-{
-	int i;
-
-	printk(KERN_INFO "Stopping all CPUs...");
-	for (i = 0; i < num_online_cpus(); i++) {
-		if (i == current_thread->cpu)
-			continue;
-		os_write_file(cpu_data[i].ipi_pipe[1], "S", 1);
-	}
-	printk(KERN_CONT "done\n");
-}
-
-static cpumask_t smp_commenced_mask = CPU_MASK_NONE;
-static cpumask_t cpu_callin_map = CPU_MASK_NONE;
-
-static int idle_proc(void *cpup)
-{
-	int cpu = (int) cpup, err;
-
-	err = os_pipe(cpu_data[cpu].ipi_pipe, 1, 1);
-	if (err < 0)
-		panic("CPU#%d failed to create IPI pipe, err = %d", cpu, -err);
-
-	os_set_fd_async(cpu_data[cpu].ipi_pipe[0]);
-
-	wmb();
-	if (cpu_test_and_set(cpu, cpu_callin_map)) {
-		printk(KERN_ERR "huh, CPU#%d already present??\n", cpu);
-		BUG();
-	}
-
-	while (!cpu_isset(cpu, smp_commenced_mask))
-		cpu_relax();
-
-	notify_cpu_starting(cpu);
-	set_cpu_online(cpu, true);
-	default_idle();
-	return 0;
-}
-
-static struct task_struct *idle_thread(int cpu)
-{
-	struct task_struct *new_task;
-
-	current->thread.request.u.thread.proc = idle_proc;
-	current->thread.request.u.thread.arg = (void *) cpu;
-	new_task = fork_idle(cpu);
-	if (IS_ERR(new_task))
-		panic("copy_process failed in idle_thread, error = %ld",
-		      PTR_ERR(new_task));
-
-	cpu_tasks[cpu] = ((struct cpu_task)
-		          { .pid = 	new_task->thread.mode.tt.extern_pid,
-			    .task = 	new_task } );
-	idle_threads[cpu] = new_task;
-	panic("skas mode doesn't support SMP");
-	return new_task;
-}
-
-void smp_prepare_cpus(unsigned int maxcpus)
-{
-	struct task_struct *idle;
-	unsigned long waittime;
-	int err, cpu, me = smp_processor_id();
-	int i;
-
-	for (i = 0; i < ncpus; ++i)
-		set_cpu_possible(i, true);
-
-	set_cpu_online(me, true);
-	cpu_set(me, cpu_callin_map);
-
-	err = os_pipe(cpu_data[me].ipi_pipe, 1, 1);
-	if (err < 0)
-		panic("CPU#0 failed to create IPI pipe, errno = %d", -err);
-
-	os_set_fd_async(cpu_data[me].ipi_pipe[0]);
-
-	for (cpu = 1; cpu < ncpus; cpu++) {
-		printk(KERN_INFO "Booting processor %d...\n", cpu);
-
-		idle = idle_thread(cpu);
-
-		init_idle(idle, cpu);
-
-		waittime = 200000000;
-		while (waittime-- && !cpu_isset(cpu, cpu_callin_map))
-			cpu_relax();
-
-		printk(KERN_INFO "%s\n",
-		       cpu_isset(cpu, cpu_calling_map) ? "done" : "failed");
-	}
-}
-
-void smp_prepare_boot_cpu(void)
-{
-	set_cpu_online(smp_processor_id(), true);
-}
-
-int __cpu_up(unsigned int cpu, struct task_struct *tidle)
-{
-	cpu_set(cpu, smp_commenced_mask);
-	while (!cpu_online(cpu))
-		mb();
-	return 0;
-}
-
-int setup_profiling_timer(unsigned int multiplier)
-{
-	printk(KERN_INFO "setup_profiling_timer\n");
-	return 0;
-}
-
-void smp_call_function_slave(int cpu);
-
-void IPI_handler(int cpu)
-{
-	unsigned char c;
-	int fd;
-
-	fd = cpu_data[cpu].ipi_pipe[0];
-	while (os_read_file(fd, &c, 1) == 1) {
-		switch (c) {
-		case 'C':
-			smp_call_function_slave(cpu);
-			break;
-
-		case 'R':
-			scheduler_ipi();
-			break;
-
-		case 'S':
-			printk(KERN_INFO "CPU#%d stopping\n", cpu);
-			while (1)
-				pause();
-			break;
-
-		default:
-			printk(KERN_ERR "CPU#%d received unknown IPI [%c]!\n",
-			       cpu, c);
-			break;
-		}
-	}
-}
-
-int hard_smp_processor_id(void)
-{
-	return pid_to_processor_id(os_getpid());
-}
-
-static DEFINE_SPINLOCK(call_lock);
-static atomic_t scf_started;
-static atomic_t scf_finished;
-static void (*func)(void *info);
-static void *info;
-
-void smp_call_function_slave(int cpu)
-{
-	atomic_inc(&scf_started);
-	(*func)(info);
-	atomic_inc(&scf_finished);
-}
-
-int smp_call_function(void (*_func)(void *info), void *_info, int wait)
-{
-	int cpus = num_online_cpus() - 1;
-	int i;
-
-	if (!cpus)
-		return 0;
-
-	/* Can deadlock when called with interrupts disabled */
-	WARN_ON(irqs_disabled());
-
-	spin_lock_bh(&call_lock);
-	atomic_set(&scf_started, 0);
-	atomic_set(&scf_finished, 0);
-	func = _func;
-	info = _info;
-
-	for_each_online_cpu(i)
-		os_write_file(cpu_data[i].ipi_pipe[1], "C", 1);
-
-	while (atomic_read(&scf_started) != cpus)
-		barrier();
-
-	if (wait)
-		while (atomic_read(&scf_finished) != cpus)
-			barrier();
-
-	spin_unlock_bh(&call_lock);
-	return 0;
-}
-
-#endif

arch/um/kernel/sysrq.c

@@ -29,7 +29,7 @@ static const struct stacktrace_ops stackops = {
 
 void show_stack(struct task_struct *task, unsigned long *stack)
 {
-	unsigned long *sp = stack, bp = 0;
+	unsigned long *sp = stack;
 	struct pt_regs *segv_regs = current->thread.segv_regs;
 	int i;
 
@@ -39,10 +39,6 @@ void show_stack(struct task_struct *task, unsigned long *stack)
 		return;
 	}
 
-#ifdef CONFIG_FRAME_POINTER
-	bp = get_frame_pointer(task, segv_regs);
-#endif
-
 	if (!stack)
 		sp = get_stack_pointer(task, segv_regs);
 

arch/um/kernel/trap.c

@@ -220,7 +220,7 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
 		panic("Segfault with no mm");
 	}
 
-	if (SEGV_IS_FIXABLE(&fi) || SEGV_MAYBE_FIXABLE(&fi))
+	if (SEGV_IS_FIXABLE(&fi))
 		err = handle_page_fault(address, ip, is_write, is_user,
 					&si.si_code);
 	else {

arch/um/kernel/um_arch.c

@@ -11,6 +11,7 @@
 #include <linux/string.h>
 #include <linux/utsname.h>
 #include <linux/sched.h>
+#include <linux/kmsg_dump.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 #include <asm/sections.h>
@@ -66,12 +67,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 {
 	int index = 0;
 
-#ifdef CONFIG_SMP
-	index = (struct cpuinfo_um *) v - cpu_data;
-	if (!cpu_online(index))
-		return 0;
-#endif
-
 	seq_printf(m, "processor\t: %d\n", index);
 	seq_printf(m, "vendor_id\t: User Mode Linux\n");
 	seq_printf(m, "model name\t: UML\n");
@@ -168,23 +163,6 @@ __uml_setup("debug", no_skas_debug_setup,
 "    this flag is not needed to run gdb on UML in skas mode\n\n"
 );
 
-#ifdef CONFIG_SMP
-static int __init uml_ncpus_setup(char *line, int *add)
-{
-	if (!sscanf(line, "%d", &ncpus)) {
-		printf("Couldn't parse [%s]\n", line);
-		return -1;
-	}
-
-	return 0;
-}
-
-__uml_setup("ncpus=", uml_ncpus_setup,
-"ncpus=<# of desired CPUs>\n"
-"    This tells an SMP kernel how many virtual processors to start.\n\n"
-);
-#endif
-
 static int __init Usage(char *line, int *add)
 {
 	const char **p;
@@ -234,6 +212,7 @@ static void __init uml_postsetup(void)
 static int panic_exit(struct notifier_block *self, unsigned long unused1,
 		      void *unused2)
 {
+	kmsg_dump(KMSG_DUMP_PANIC);
 	bust_spinlocks(1);
 	bust_spinlocks(0);
 	uml_exitcode = 1;
@@ -247,6 +226,16 @@ static struct notifier_block panic_exit_notifier = {
 	.priority 		= 0
 };
 
+void uml_finishsetup(void)
+{
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &panic_exit_notifier);
+
+	uml_postsetup();
+
+	new_thread_handler();
+}
+
 /* Set during early boot */
 unsigned long task_size;
 EXPORT_SYMBOL(task_size);
@@ -268,7 +257,6 @@ int __init linux_main(int argc, char **argv)
 	unsigned long stack;
 	unsigned int i;
 	int add;
-	char * mode;
 
 	for (i = 1; i < argc; i++) {
 		if ((i == 1) && (argv[i][0] == ' '))
@@ -291,15 +279,6 @@ int __init linux_main(int argc, char **argv)
 	/* OS sanity checks that need to happen before the kernel runs */
 	os_early_checks();
 
-	can_do_skas();
-
-	if (proc_mm && ptrace_faultinfo)
-		mode = "SKAS3";
-	else
-		mode = "SKAS0";
-
-	printf("UML running in %s mode\n", mode);
-
 	brk_start = (unsigned long) sbrk(0);
 
 	/*
@@ -334,11 +313,6 @@ int __init linux_main(int argc, char **argv)
 	if (physmem_size + iomem_size > max_physmem) {
 		highmem = physmem_size + iomem_size - max_physmem;
 		physmem_size -= highmem;
-#ifndef CONFIG_HIGHMEM
-		highmem = 0;
-		printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
-		       "to %Lu bytes\n", physmem_size);
-#endif
 	}
 
 	high_physmem = uml_physmem + physmem_size;
@@ -362,11 +336,6 @@ int __init linux_main(int argc, char **argv)
 		printf("Kernel virtual memory size shrunk to %lu bytes\n",
 		       virtmem_size);
 
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &panic_exit_notifier);
-
-	uml_postsetup();
-
 	stack_protections((unsigned long) &init_thread_info);
 	os_flush_stdout();
 
@@ -390,15 +359,3 @@ void __init check_bugs(void)
 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 {
 }
-
-#ifdef CONFIG_SMP
-void alternatives_smp_module_add(struct module *mod, char *name,
-				 void *locks, void *locks_end,
-				 void *text,  void *text_end)
-{
-}
-
-void alternatives_smp_module_del(struct module *mod)
-{
-}
-#endif

arch/um/os-Linux/process.c

@@ -16,7 +16,6 @@
 #include <init.h>
 #include <longjmp.h>
 #include <os.h>
-#include <skas_ptrace.h>
 
 #define ARBITRARY_ADDR -1
 #define FAILURE_PID    -1
@@ -102,21 +101,6 @@ void os_kill_process(int pid, int reap_child)
 		CATCH_EINTR(waitpid(pid, NULL, __WALL));
 }
 
-/* This is here uniquely to have access to the userspace errno, i.e. the one
- * used by ptrace in case of error.
- */
-
-long os_ptrace_ldt(long pid, long addr, long data)
-{
-	int ret;
-
-	ret = ptrace(PTRACE_LDT, pid, addr, data);
-
-	if (ret < 0)
-		return -errno;
-	return ret;
-}
-
 /* Kill off a ptraced child by all means available.  kill it normally first,
  * then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
  * which it can't exit directly.

arch/um/os-Linux/skas/mem.c

@@ -12,7 +12,6 @@
 #include <as-layout.h>
 #include <mm_id.h>
 #include <os.h>
-#include <proc_mm.h>
 #include <ptrace_user.h>
 #include <registers.h>
 #include <skas.h>
@@ -46,8 +45,6 @@ static int __init init_syscall_regs(void)
 
 __initcall(init_syscall_regs);
 
-extern int proc_mm;
-
 static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
 {
 	int n, i;
@@ -56,10 +53,6 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
 	unsigned long * syscall;
 	int err, pid = mm_idp->u.pid;
 
-	if (proc_mm)
-		/* FIXME: Need to look up userspace_pid by cpu */
-		pid = userspace_pid[0];
-
 	n = ptrace_setregs(pid, syscall_regs);
 	if (n < 0) {
 		printk(UM_KERN_ERR "Registers - \n");
@@ -178,38 +171,12 @@ int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
 	int phys_fd, unsigned long long offset, int done, void **data)
 {
 	int ret;
+	unsigned long args[] = { virt, len, prot,
+				 MAP_SHARED | MAP_FIXED, phys_fd,
+				 MMAP_OFFSET(offset) };
 
-	if (proc_mm) {
-		struct proc_mm_op map;
-		int fd = mm_idp->u.mm_fd;
-
-		map = ((struct proc_mm_op) { .op	= MM_MMAP,
-				       .u		=
-				       { .mmap	=
-					 { .addr	= virt,
-					   .len	= len,
-					   .prot	= prot,
-					   .flags	= MAP_SHARED |
-					   MAP_FIXED,
-					   .fd	= phys_fd,
-					   .offset= offset
-					 } } } );
-		CATCH_EINTR(ret = write(fd, &map, sizeof(map)));
-		if (ret != sizeof(map)) {
-			ret = -errno;
-			printk(UM_KERN_ERR "map : /proc/mm map failed, "
-			       "err = %d\n", -ret);
-		}
-		else ret = 0;
-	}
-	else {
-		unsigned long args[] = { virt, len, prot,
-					 MAP_SHARED | MAP_FIXED, phys_fd,
-					 MMAP_OFFSET(offset) };
-
-		ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
-				       data, done);
-	}
+	ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
+			       data, done);
 
 	return ret;
 }
@@ -218,32 +185,11 @@ int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 	  int done, void **data)
 {
 	int ret;
+	unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
+				 0 };
 
-	if (proc_mm) {
-		struct proc_mm_op unmap;
-		int fd = mm_idp->u.mm_fd;
-
-		unmap = ((struct proc_mm_op) { .op	= MM_MUNMAP,
-					 .u	=
-					 { .munmap	=
-					   { .addr	=
-					     (unsigned long) addr,
-					     .len		= len } } } );
-		CATCH_EINTR(ret = write(fd, &unmap, sizeof(unmap)));
-		if (ret != sizeof(unmap)) {
-			ret = -errno;
-			printk(UM_KERN_ERR "unmap - proc_mm write returned "
-			       "%d\n", ret);
-		}
-		else ret = 0;
-	}
-	else {
-		unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
-					 0 };
-
-		ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
-				       data, done);
-	}
+	ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
+			       data, done);
 
 	return ret;
 }
@@ -251,33 +197,11 @@ int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 	    unsigned int prot, int done, void **data)
 {
-	struct proc_mm_op protect;
 	int ret;
+	unsigned long args[] = { addr, len, prot, 0, 0, 0 };
 
-	if (proc_mm) {
-		int fd = mm_idp->u.mm_fd;
-
-		protect = ((struct proc_mm_op) { .op	= MM_MPROTECT,
-					   .u	=
-					   { .mprotect	=
-					     { .addr	=
-					       (unsigned long) addr,
-					       .len	= len,
-					       .prot	= prot } } } );
-
-		CATCH_EINTR(ret = write(fd, &protect, sizeof(protect)));
-		if (ret != sizeof(protect)) {
-			ret = -errno;
-			printk(UM_KERN_ERR "protect failed, err = %d", -ret);
-		}
-		else ret = 0;
-	}
-	else {
-		unsigned long args[] = { addr, len, prot, 0, 0, 0 };
-
-		ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
-				       data, done);
-	}
+	ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
+			       data, done);
 
 	return ret;
 }

arch/um/os-Linux/skas/process.c

@@ -16,11 +16,9 @@
 #include <kern_util.h>
 #include <mem.h>
 #include <os.h>
-#include <proc_mm.h>
 #include <ptrace_user.h>
 #include <registers.h>
 #include <skas.h>
-#include <skas_ptrace.h>
 #include <sysdep/stub.h>
 
 int is_skas_winch(int pid, int fd, void *data)
@@ -91,50 +89,33 @@ extern unsigned long current_stub_stack(void);
 static void get_skas_faultinfo(int pid, struct faultinfo *fi)
 {
 	int err;
+	unsigned long fpregs[FP_SIZE];
 
-	if (ptrace_faultinfo) {
-		err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
-		if (err) {
-			printk(UM_KERN_ERR "get_skas_faultinfo - "
-			       "PTRACE_FAULTINFO failed, errno = %d\n", errno);
-			fatal_sigsegv();
-		}
-
-		/* Special handling for i386, which has different structs */
-		if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
-			memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
-			       sizeof(struct faultinfo) -
-			       sizeof(struct ptrace_faultinfo));
+	err = get_fp_registers(pid, fpregs);
+	if (err < 0) {
+		printk(UM_KERN_ERR "save_fp_registers returned %d\n",
+		       err);
+		fatal_sigsegv();
 	}
-	else {
-		unsigned long fpregs[FP_SIZE];
-
-		err = get_fp_registers(pid, fpregs);
-		if (err < 0) {
-			printk(UM_KERN_ERR "save_fp_registers returned %d\n",
-			       err);
-			fatal_sigsegv();
-		}
-		err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
-		if (err) {
-			printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
-			       "errno = %d\n", pid, errno);
-			fatal_sigsegv();
-		}
-		wait_stub_done(pid);
+	err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
+	if (err) {
+		printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
+		       "errno = %d\n", pid, errno);
+		fatal_sigsegv();
+	}
+	wait_stub_done(pid);
 
-		/*
-		 * faultinfo is prepared by the stub-segv-handler at start of
-		 * the stub stack page. We just have to copy it.
-		 */
-		memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
+	/*
+	 * faultinfo is prepared by the stub-segv-handler at start of
+	 * the stub stack page. We just have to copy it.
+	 */
+	memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
 
-		err = put_fp_registers(pid, fpregs);
-		if (err < 0) {
-			printk(UM_KERN_ERR "put_fp_registers returned %d\n",
-			       err);
-			fatal_sigsegv();
-		}
+	err = put_fp_registers(pid, fpregs);
+	if (err < 0) {
+		printk(UM_KERN_ERR "put_fp_registers returned %d\n",
+		       err);
+		fatal_sigsegv();
 	}
 }
 
@@ -198,7 +179,8 @@ extern int __syscall_stub_start;
 static int userspace_tramp(void *stack)
 {
 	void *addr;
-	int err;
+	int err, fd;
+	unsigned long long offset;
 
 	ptrace(PTRACE_TRACEME, 0, 0, 0);
 
@@ -211,36 +193,32 @@ static int userspace_tramp(void *stack)
 		exit(1);
 	}
 
-	if (!proc_mm) {
-		/*
-		 * This has a pte, but it can't be mapped in with the usual
-		 * tlb_flush mechanism because this is part of that mechanism
-		 */
-		int fd;
-		unsigned long long offset;
-		fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
-		addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
-			      PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
+	/*
+	 * This has a pte, but it can't be mapped in with the usual
+	 * tlb_flush mechanism because this is part of that mechanism
+	 */
+	fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
+	addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
+		      PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
+	if (addr == MAP_FAILED) {
+		printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
+		       "errno = %d\n", STUB_CODE, errno);
+		exit(1);
+	}
+
+	if (stack != NULL) {
+		fd = phys_mapping(to_phys(stack), &offset);
+		addr = mmap((void *) STUB_DATA,
+			    UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
+			    MAP_FIXED | MAP_SHARED, fd, offset);
 		if (addr == MAP_FAILED) {
-			printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
-			       "errno = %d\n", STUB_CODE, errno);
+			printk(UM_KERN_ERR "mapping segfault stack "
+			       "at 0x%lx failed, errno = %d\n",
+			       STUB_DATA, errno);
 			exit(1);
 		}
-
-		if (stack != NULL) {
-			fd = phys_mapping(to_phys(stack), &offset);
-			addr = mmap((void *) STUB_DATA,
-				    UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
-				    MAP_FIXED | MAP_SHARED, fd, offset);
-			if (addr == MAP_FAILED) {
-				printk(UM_KERN_ERR "mapping segfault stack "
-				       "at 0x%lx failed, errno = %d\n",
-				       STUB_DATA, errno);
-				exit(1);
-			}
-		}
 	}
-	if (!ptrace_faultinfo && (stack != NULL)) {
+	if (stack != NULL) {
 		struct sigaction sa;
 
 		unsigned long v = STUB_CODE +
@@ -286,11 +264,7 @@ int start_userspace(unsigned long stub_stack)
 
 	sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
 
-	flags = CLONE_FILES;
-	if (proc_mm)
-		flags |= CLONE_VM;
-	else
-		flags |= SIGCHLD;
+	flags = CLONE_FILES | SIGCHLD;
 
 	pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
 	if (pid < 0) {
@@ -413,8 +387,7 @@ void userspace(struct uml_pt_regs *regs)
 
 			switch (sig) {
 			case SIGSEGV:
-				if (PTRACE_FULL_FAULTINFO ||
-				    !ptrace_faultinfo) {
+				if (PTRACE_FULL_FAULTINFO) {
 					get_skas_faultinfo(pid,
 							   &regs->faultinfo);
 					(*sig_info[SIGSEGV])(SIGSEGV, (struct siginfo *)&si,
@@ -571,67 +544,6 @@ int copy_context_skas0(unsigned long new_stack, int pid)
 	return err;
 }
 
-/*
- * This is used only, if stub pages are needed, while proc_mm is
- * available. Opening /proc/mm creates a new mm_context, which lacks
- * the stub-pages. Thus, we map them using /proc/mm-fd
- */
-int map_stub_pages(int fd, unsigned long code, unsigned long data,
-		   unsigned long stack)
-{
-	struct proc_mm_op mmop;
-	int n;
-	unsigned long long code_offset;
-	int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start),
-				   &code_offset);
-
-	mmop = ((struct proc_mm_op) { .op        = MM_MMAP,
-				      .u         =
-				      { .mmap    =
-					{ .addr    = code,
-					  .len     = UM_KERN_PAGE_SIZE,
-					  .prot    = PROT_EXEC,
-					  .flags   = MAP_FIXED | MAP_PRIVATE,
-					  .fd      = code_fd,
-					  .offset  = code_offset
-	} } });
-	CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
-	if (n != sizeof(mmop)) {
-		n = errno;
-		printk(UM_KERN_ERR "mmap args - addr = 0x%lx, fd = %d, "
-		       "offset = %llx\n", code, code_fd,
-		       (unsigned long long) code_offset);
-		printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for code "
-		       "failed, err = %d\n", n);
-		return -n;
-	}
-
-	if (stack) {
-		unsigned long long map_offset;
-		int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
-		mmop = ((struct proc_mm_op)
-				{ .op        = MM_MMAP,
-				  .u         =
-				  { .mmap    =
-				    { .addr    = data,
-				      .len     = UM_KERN_PAGE_SIZE,
-				      .prot    = PROT_READ | PROT_WRITE,
-				      .flags   = MAP_FIXED | MAP_SHARED,
-				      .fd      = map_fd,
-				      .offset  = map_offset
-		} } });
-		CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
-		if (n != sizeof(mmop)) {
-			n = errno;
-			printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for "
-			       "data failed, err = %d\n", n);
-			return -n;
-		}
-	}
-
-	return 0;
-}
-
 void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
 {
 	(*buf)[0].JB_IP = (unsigned long) handler;
@@ -674,7 +586,7 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
 	n = setjmp(initial_jmpbuf);
 	switch (n) {
 	case INIT_JMP_NEW_THREAD:
-		(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
+		(*switch_buf)[0].JB_IP = (unsigned long) uml_finishsetup;
 		(*switch_buf)[0].JB_SP = (unsigned long) stack +
 			UM_THREAD_SIZE - sizeof(void *);
 		break;
@@ -728,17 +640,5 @@ void reboot_skas(void)
 
 void __switch_mm(struct mm_id *mm_idp)
 {
-	int err;
-
-	/* FIXME: need cpu pid in __switch_mm */
-	if (proc_mm) {
-		err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
-			     mm_idp->u.mm_fd);
-		if (err) {
-			printk(UM_KERN_ERR "__switch_mm - PTRACE_SWITCH_MM "
-			       "failed, errno = %d\n", errno);
-			fatal_sigsegv();
-		}
-	}
-	else userspace_pid[0] = mm_idp->u.pid;
+	userspace_pid[0] = mm_idp->u.pid;
 }

arch/um/os-Linux/start_up.c

@@ -24,7 +24,6 @@
 #include <ptrace_user.h>
 #include <registers.h>
 #include <skas.h>
-#include <skas_ptrace.h>
 
 static void ptrace_child(void)
 {
@@ -142,44 +141,6 @@ static int stop_ptraced_child(int pid, int exitcode, int mustexit)
 	return ret;
 }
 
-/* Changed only during early boot */
-int ptrace_faultinfo;
-static int disable_ptrace_faultinfo;
-
-int ptrace_ldt;
-static int disable_ptrace_ldt;
-
-int proc_mm;
-static int disable_proc_mm;
-
-int have_switch_mm;
-static int disable_switch_mm;
-
-int skas_needs_stub;
-
-static int __init skas0_cmd_param(char *str, int* add)
-{
-	disable_ptrace_faultinfo = 1;
-	disable_ptrace_ldt = 1;
-	disable_proc_mm = 1;
-	disable_switch_mm = 1;
-
-	return 0;
-}
-
-/* The two __uml_setup would conflict, without this stupid alias. */
-
-static int __init mode_skas0_cmd_param(char *str, int* add)
-	__attribute__((alias("skas0_cmd_param")));
-
-__uml_setup("skas0", skas0_cmd_param,
-"skas0\n"
-"    Disables SKAS3 and SKAS4 usage, so that SKAS0 is used\n\n");
-
-__uml_setup("mode=skas0", mode_skas0_cmd_param,
-"mode=skas0\n"
-"    Disables SKAS3 and SKAS4 usage, so that SKAS0 is used.\n\n");
-
 /* Changed only during early boot */
 static int force_sysemu_disabled = 0;
 
@@ -376,121 +337,6 @@ void __init os_early_checks(void)
 	stop_ptraced_child(pid, 1, 1);
 }
 
-static int __init noprocmm_cmd_param(char *str, int* add)
-{
-	disable_proc_mm = 1;
-	return 0;
-}
-
-__uml_setup("noprocmm", noprocmm_cmd_param,
-"noprocmm\n"
-"    Turns off usage of /proc/mm, even if host supports it.\n"
-"    To support /proc/mm, the host needs to be patched using\n"
-"    the current skas3 patch.\n\n");
-
-static int __init noptracefaultinfo_cmd_param(char *str, int* add)
-{
-	disable_ptrace_faultinfo = 1;
-	return 0;
-}
-
-__uml_setup("noptracefaultinfo", noptracefaultinfo_cmd_param,
-"noptracefaultinfo\n"
-"    Turns off usage of PTRACE_FAULTINFO, even if host supports\n"
-"    it. To support PTRACE_FAULTINFO, the host needs to be patched\n"
-"    using the current skas3 patch.\n\n");
-
-static int __init noptraceldt_cmd_param(char *str, int* add)
-{
-	disable_ptrace_ldt = 1;
-	return 0;
-}
-
-__uml_setup("noptraceldt", noptraceldt_cmd_param,
-"noptraceldt\n"
-"    Turns off usage of PTRACE_LDT, even if host supports it.\n"
-"    To support PTRACE_LDT, the host needs to be patched using\n"
-"    the current skas3 patch.\n\n");
-
-static inline void check_skas3_ptrace_faultinfo(void)
-{
-	struct ptrace_faultinfo fi;
-	int pid, n;
-
-	non_fatal("  - PTRACE_FAULTINFO...");
-	pid = start_ptraced_child();
-
-	n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
-	if (n < 0) {
-		if (errno == EIO)
-			non_fatal("not found\n");
-		else
-			perror("not found");
-	} else if (disable_ptrace_faultinfo)
-		non_fatal("found but disabled on command line\n");
-	else {
-		ptrace_faultinfo = 1;
-		non_fatal("found\n");
-	}
-
-	stop_ptraced_child(pid, 1, 1);
-}
-
-static inline void check_skas3_ptrace_ldt(void)
-{
-#ifdef PTRACE_LDT
-	int pid, n;
-	unsigned char ldtbuf[40];
-	struct ptrace_ldt ldt_op = (struct ptrace_ldt) {
-		.func = 2, /* read default ldt */
-		.ptr = ldtbuf,
-		.bytecount = sizeof(ldtbuf)};
-
-	non_fatal("  - PTRACE_LDT...");
-	pid = start_ptraced_child();
-
-	n = ptrace(PTRACE_LDT, pid, 0, (unsigned long) &ldt_op);
-	if (n < 0) {
-		if (errno == EIO)
-			non_fatal("not found\n");
-		else
-			perror("not found");
-	} else if (disable_ptrace_ldt)
-		non_fatal("found, but use is disabled\n");
-	else {
-		ptrace_ldt = 1;
-		non_fatal("found\n");
-	}
-
-	stop_ptraced_child(pid, 1, 1);
-#endif
-}
-
-static inline void check_skas3_proc_mm(void)
-{
-	non_fatal("  - /proc/mm...");
-	if (access("/proc/mm", W_OK) < 0)
-		perror("not found");
-	else if (disable_proc_mm)
-		non_fatal("found but disabled on command line\n");
-	else {
-		proc_mm = 1;
-		non_fatal("found\n");
-	}
-}
-
-void can_do_skas(void)
-{
-	non_fatal("Checking for the skas3 patch in the host:\n");
-
-	check_skas3_proc_mm();
-	check_skas3_ptrace_faultinfo();
-	check_skas3_ptrace_ldt();
-
-	if (!proc_mm || !ptrace_faultinfo || !ptrace_ldt)
-		skas_needs_stub = 1;
-}
-
 int __init parse_iomem(char *str, int *add)
 {
 	struct iomem_region *new;

arch/um/sys-ia64/Makefile

@@ -1,11 +0,0 @@
-OBJ = built-in.o
-
-OBJS =
-
-all: $(OBJ)
-
-$(OBJ): $(OBJS)
-	rm -f $@
-	$(LD) $(LINKFLAGS) --start-group $^ --end-group -o $@
-
-clean-files := $(OBJS) link.ld

arch/um/sys-ia64/sysdep/ptrace.h

@@ -1,16 +0,0 @@
-/* 
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYSDEP_IA64_PTRACE_H
-#define __SYSDEP_IA64_PTRACE_H
-
-struct sys_pt_regs {
-  int foo;
-};
-
-#define EMPTY_REGS { 0 }
-
-#endif
-

arch/um/sys-ia64/sysdep/sigcontext.h

@@ -1,10 +0,0 @@
-/* 
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYSDEP_IA64_SIGCONTEXT_H
-#define __SYSDEP_IA64_SIGCONTEXT_H
-
-#endif
-

arch/um/sys-ia64/sysdep/skas_ptrace.h

@@ -1,22 +0,0 @@
-/*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYSDEP_IA64_SKAS_PTRACE_H
-#define __SYSDEP_IA64_SKAS_PTRACE_H
-
-struct ptrace_faultinfo {
-        int is_write;
-        unsigned long addr;
-};
-
-struct ptrace_ldt {
-        int func;
-        void *ptr;
-        unsigned long bytecount;
-};
-
-#define PTRACE_LDT 54
-
-#endif

arch/um/sys-ia64/sysdep/syscalls.h

@@ -1,10 +0,0 @@
-/* 
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYSDEP_IA64_SYSCALLS_H
-#define __SYSDEP_IA64_SYSCALLS_H
-
-#endif
-

arch/um/sys-ppc/Makefile

@@ -1,65 +0,0 @@
-OBJ = built-in.o
-
-.S.o:
-	$(CC) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
-
-OBJS = ptrace.o sigcontext.o checksum.o miscthings.o misc.o \
-	ptrace_user.o sysrq.o
-
-asflags-y := -DCONFIG_PPC32 -I. -I$(srctree)/arch/ppc/kernel
-
-all: $(OBJ)
-
-$(OBJ): $(OBJS)
-	rm -f $@
-	$(LD) $(LINKFLAGS) --start-group $^ --end-group -o $@
-
-ptrace_user.o: ptrace_user.c
-	$(CC) -D__KERNEL__ $(USER_CFLAGS) $(ccflags-y) -c -o $@ $<
-
-sigcontext.o: sigcontext.c
-	$(CC) $(USER_CFLAGS) $(ccflags-y) -c -o $@ $<
-
-checksum.S:
-	rm -f $@
-	ln -s $(srctree)/arch/ppc/lib/$@ $@
-
-mk_defs.c:
-	rm -f $@
-	ln -s $(srctree)/arch/ppc/kernel/$@ $@
-
-ppc_defs.head:
-	rm -f $@
-	ln -s $(srctree)/arch/ppc/kernel/$@ $@
-
-ppc_defs.h: mk_defs.c ppc_defs.head \
-		$(srctree)/include/asm-ppc/mmu.h \
-		$(srctree)/include/asm-ppc/processor.h \
-		$(srctree)/include/asm-ppc/pgtable.h \
-		$(srctree)/include/asm-ppc/ptrace.h
-#	$(CC) $(CFLAGS) -S mk_defs.c
-	cp ppc_defs.head ppc_defs.h
-# for bk, this way we can write to the file even if it's not checked out
-	echo '#define THREAD 608' >> ppc_defs.h
-	echo '#define PT_REGS 8' >> ppc_defs.h
-	echo '#define CLONE_VM 256' >> ppc_defs.h
-#	chmod u+w ppc_defs.h
-#	grep '^#define' mk_defs.s >> ppc_defs.h
-#	rm mk_defs.s
-
-# the asm link is horrible, and breaks the other targets.  This is also
-# not going to work with parallel makes.
-
-checksum.o: checksum.S
-	rm -f asm
-	ln -s $(srctree)/include/asm-ppc asm
-	$(CC) $(asflags-y) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
-	rm -f asm
-
-misc.o: misc.S ppc_defs.h
-	rm -f asm
-	ln -s $(srctree)/include/asm-ppc asm
-	$(CC) $(asflags-y) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
-	rm -f asm
-
-clean-files := $(OBJS) ppc_defs.h checksum.S mk_defs.c

arch/um/sys-ppc/asm/archparam.h

@@ -1,8 +0,0 @@
-#ifndef __UM_ARCHPARAM_PPC_H
-#define __UM_ARCHPARAM_PPC_H
-
-/********* Bits for asm-um/string.h **********/
-
-#define __HAVE_ARCH_STRRCHR
-
-#endif

arch/um/sys-ppc/asm/elf.h

@@ -1,51 +0,0 @@
-#ifndef __UM_ELF_PPC_H
-#define __UM_ELF_PPC_H
-
-
-extern long elf_aux_hwcap;
-#define ELF_HWCAP (elf_aux_hwcap)
-
-#define SET_PERSONALITY(ex) do ; while(0)
-
-#define ELF_EXEC_PAGESIZE 4096
-
-#define elf_check_arch(x) (1)
-
-#ifdef CONFIG_64BIT
-#define ELF_CLASS ELFCLASS64
-#else
-#define ELF_CLASS ELFCLASS32
-#endif
-
-#define R_386_NONE	0
-#define R_386_32	1
-#define R_386_PC32	2
-#define R_386_GOT32	3
-#define R_386_PLT32	4
-#define R_386_COPY	5
-#define R_386_GLOB_DAT	6
-#define R_386_JMP_SLOT	7
-#define R_386_RELATIVE	8
-#define R_386_GOTOFF	9
-#define R_386_GOTPC	10
-#define R_386_NUM	11
-
-#define ELF_PLATFORM (0)
-
-#define ELF_ET_DYN_BASE (0x08000000)
-
-/* the following stolen from asm-ppc/elf.h */
-#define ELF_NGREG	48	/* includes nip, msr, lr, etc. */
-#define ELF_NFPREG	33	/* includes fpscr */
-/* General registers */
-typedef unsigned long elf_greg_t;
-typedef elf_greg_t elf_gregset_t[ELF_NGREG];
-
-/* Floating point registers */
-typedef double elf_fpreg_t;
-typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
-
-#define ELF_DATA        ELFDATA2MSB
-#define ELF_ARCH	EM_PPC
-
-#endif

arch/um/sys-ppc/asm/processor.h

@@ -1,15 +0,0 @@
-#ifndef __UM_PROCESSOR_PPC_H
-#define __UM_PROCESSOR_PPC_H
-
-#if defined(__ASSEMBLY__)
-
-#define CONFIG_PPC_MULTIPLATFORM
-#include "arch/processor.h"
-
-#else
-
-#include "asm/processor-generic.h"
-
-#endif
-
-#endif

arch/um/sys-ppc/misc.S

@@ -1,111 +0,0 @@
-/*
- * This file contains miscellaneous low-level functions.
- *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
- * and Paul Mackerras.
- *
- * A couple of functions stolen from arch/ppc/kernel/misc.S for UML
- * by Chris Emerson.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- */
-
-#include <asm/processor.h>
-#include "ppc_asm.h"
-
-#if defined(CONFIG_4xx) || defined(CONFIG_8xx)
-#define CACHE_LINE_SIZE		16
-#define LG_CACHE_LINE_SIZE	4
-#define MAX_COPY_PREFETCH	1
-#else
-#define CACHE_LINE_SIZE		32
-#define LG_CACHE_LINE_SIZE	5
-#define MAX_COPY_PREFETCH	4
-#endif /* CONFIG_4xx || CONFIG_8xx */
-
-	.text
-
-/*
- * Clear a page using the dcbz instruction, which doesn't cause any
- * memory traffic (except to write out any cache lines which get
- * displaced).  This only works on cacheable memory.
- */
-_GLOBAL(clear_page)
-	li	r0,4096/CACHE_LINE_SIZE
-	mtctr	r0
-#ifdef CONFIG_8xx
-	li	r4, 0
-1:	stw	r4, 0(r3)
-	stw	r4, 4(r3)
-	stw	r4, 8(r3)
-	stw	r4, 12(r3)
-#else
-1:	dcbz	0,r3
-#endif
-	addi	r3,r3,CACHE_LINE_SIZE
-	bdnz	1b
-	blr
-
-/*
- * Copy a whole page.  We use the dcbz instruction on the destination
- * to reduce memory traffic (it eliminates the unnecessary reads of
- * the destination into cache).  This requires that the destination
- * is cacheable.
- */
-#define COPY_16_BYTES		\
-	lwz	r6,4(r4);	\
-	lwz	r7,8(r4);	\
-	lwz	r8,12(r4);	\
-	lwzu	r9,16(r4);	\
-	stw	r6,4(r3);	\
-	stw	r7,8(r3);	\
-	stw	r8,12(r3);	\
-	stwu	r9,16(r3)
-
-_GLOBAL(copy_page)
-	addi	r3,r3,-4
-	addi	r4,r4,-4
-	li	r5,4
-
-#ifndef CONFIG_8xx
-#if MAX_COPY_PREFETCH > 1
-	li	r0,MAX_COPY_PREFETCH
-	li	r11,4
-	mtctr	r0
-11:	dcbt	r11,r4
-	addi	r11,r11,CACHE_LINE_SIZE
-	bdnz	11b
-#else /* MAX_COPY_PREFETCH == 1 */
-	dcbt	r5,r4
-	li	r11,CACHE_LINE_SIZE+4
-#endif /* MAX_COPY_PREFETCH */
-#endif /* CONFIG_8xx */
-
-	li	r0,4096/CACHE_LINE_SIZE
-	mtctr	r0
-1:
-#ifndef CONFIG_8xx
-	dcbt	r11,r4
-	dcbz	r5,r3
-#endif
-	COPY_16_BYTES
-#if CACHE_LINE_SIZE >= 32
-	COPY_16_BYTES
-#if CACHE_LINE_SIZE >= 64
-	COPY_16_BYTES
-	COPY_16_BYTES
-#if CACHE_LINE_SIZE >= 128
-	COPY_16_BYTES
-	COPY_16_BYTES
-	COPY_16_BYTES
-	COPY_16_BYTES
-#endif
-#endif
-#endif
-	bdnz	1b
-	blr

arch/um/sys-ppc/miscthings.c

@@ -1,42 +0,0 @@
-#include <linux/threads.h>
-#include <linux/stddef.h>  // for NULL
-#include <linux/elf.h>  // for AT_NULL
-
-/* The following function nicked from arch/ppc/kernel/process.c and
- * adapted slightly */
-/*
- * XXX ld.so expects the auxiliary table to start on
- * a 16-byte boundary, so we have to find it and
- * move it up. :-(
- */
-void shove_aux_table(unsigned long sp)
-{
-	int argc;
-	char *p;
-	unsigned long e;
-	unsigned long aux_start, offset;
-
-	argc = *(int *)sp;
-	sp += sizeof(int) + (argc + 1) * sizeof(char *);
-	/* skip over the environment pointers */
-	do {
-		p = *(char **)sp;
-		sp += sizeof(char *);
-	} while (p != NULL);
-	aux_start = sp;
-	/* skip to the end of the auxiliary table */
-	do {
-		e = *(unsigned long *)sp;
-		sp += 2 * sizeof(unsigned long);
-	} while (e != AT_NULL);
-	offset = ((aux_start + 15) & ~15) - aux_start;
-	if (offset != 0) {
-		do {
-			sp -= sizeof(unsigned long);
-			e = *(unsigned long *)sp;
-			*(unsigned long *)(sp + offset) = e;
-		} while (sp > aux_start);
-	}
-}
-/* END stuff taken from arch/ppc/kernel/process.c */
-

arch/um/sys-ppc/ptrace.c

@@ -1,58 +0,0 @@
-#include <linux/sched.h>
-#include "asm/ptrace.h"
-
-int putreg(struct task_struct *child, unsigned long regno, 
-		  unsigned long value)
-{
-	child->thread.process_regs.regs[regno >> 2] = value;
-	return 0;
-}
-
-int poke_user(struct task_struct *child, long addr, long data)
-{
-	if ((addr & 3) || addr < 0)
-		return -EIO;
-
-	if (addr < MAX_REG_OFFSET)
-		return putreg(child, addr, data);
-
-	else if((addr >= offsetof(struct user, u_debugreg[0])) &&
-		(addr <= offsetof(struct user, u_debugreg[7]))){
-		  addr -= offsetof(struct user, u_debugreg[0]);
-		  addr = addr >> 2;
-		  if((addr == 4) || (addr == 5)) return -EIO;
-		  child->thread.arch.debugregs[addr] = data;
-		  return 0;
-	}
-	return -EIO;
-}
-
-unsigned long getreg(struct task_struct *child, unsigned long regno)
-{
-	unsigned long retval = ~0UL;
-
-	retval &= child->thread.process_regs.regs[regno >> 2];
-	return retval;
-}
-
-int peek_user(struct task_struct *child, long addr, long data)
-{
-	/* read the word at location addr in the USER area. */
-	unsigned long tmp;
-
-	if ((addr & 3) || addr < 0)
-		return -EIO;
-
-	tmp = 0;  /* Default return condition */
-	if(addr < MAX_REG_OFFSET){
-		tmp = getreg(child, addr);
-	}
-	else if((addr >= offsetof(struct user, u_debugreg[0])) &&
-		(addr <= offsetof(struct user, u_debugreg[7]))){
-		addr -= offsetof(struct user, u_debugreg[0]);
-		addr = addr >> 2;
-		tmp = child->thread.arch.debugregs[addr];
-	}
-	return put_user(tmp, (unsigned long *) data);
-}
-

arch/um/sys-ppc/ptrace_user.c

@@ -1,29 +0,0 @@
-#include <errno.h>
-#include <asm/ptrace.h>
-#include <sysdep/ptrace.h>
-
-int ptrace_getregs(long pid, unsigned long *regs_out)
-{
-    int i;
-    for (i=0; i < sizeof(struct sys_pt_regs)/sizeof(PPC_REG); ++i) {
-	errno = 0;
-	regs_out->regs[i] = ptrace(PTRACE_PEEKUSR, pid, i*4, 0);
-	if (errno) {
-	    return -errno;
-	}
-    }
-    return 0;
-}
-
-int ptrace_setregs(long pid, unsigned long *regs_in)
-{
-    int i;
-    for (i=0; i < sizeof(struct sys_pt_regs)/sizeof(PPC_REG); ++i) {
-	if (i != 34 /* FIXME: PT_ORIG_R3 */ && i <= PT_MQ) {
-	    if (ptrace(PTRACE_POKEUSR, pid, i*4, regs_in->regs[i]) < 0) {
-		return -errno;
-	    }
-	}
-    }
-    return 0;
-}

arch/um/sys-ppc/shared/sysdep/ptrace.h

@@ -1,93 +0,0 @@
-/* 
- * Licensed under the GPL
- */
-
-#ifndef __SYS_PTRACE_PPC_H
-#define __SYS_PTRACE_PPC_H
-
-#include <linux/types.h>
-
-/* the following taken from <asm-ppc/ptrace.h> */
-
-#ifdef CONFIG_PPC64
-#define PPC_REG unsigned long /*long*/
-#else
-#define PPC_REG unsigned long
-#endif
-struct sys_pt_regs_s {
-	PPC_REG gpr[32];
-	PPC_REG nip;
-	PPC_REG msr;
-	PPC_REG orig_gpr3;	/* Used for restarting system calls */
-	PPC_REG ctr;
-	PPC_REG link;
-	PPC_REG xer;
-	PPC_REG ccr;
-	PPC_REG mq;		/* 601 only (not used at present) */
-				/* Used on APUS to hold IPL value. */
-	PPC_REG trap;		/* Reason for being here */
-	PPC_REG dar;		/* Fault registers */
-	PPC_REG dsisr;
-	PPC_REG result; 	/* Result of a system call */
-};
-
-#define NUM_REGS (sizeof(struct sys_pt_regs_s) / sizeof(PPC_REG))
-
-struct sys_pt_regs {
-    PPC_REG regs[sizeof(struct sys_pt_regs_s) / sizeof(PPC_REG)];
-};
-
-#define UM_MAX_REG (PT_FPR0)
-#define UM_MAX_REG_OFFSET (UM_MAX_REG * sizeof(PPC_REG))
-
-#define EMPTY_REGS { { [ 0 ... NUM_REGS - 1] = 0 } }
-
-#define UM_REG(r, n) ((r)->regs[n])
-
-#define UM_SYSCALL_RET(r) UM_REG(r, PT_R3)
-#define UM_SP(r) UM_REG(r, PT_R1)
-#define UM_IP(r) UM_REG(r, PT_NIP)
-#define UM_ELF_ZERO(r) UM_REG(r, PT_FPSCR)
-#define UM_SYSCALL_NR(r) UM_REG(r, PT_R0)
-#define UM_SYSCALL_ARG1(r) UM_REG(r, PT_ORIG_R3)
-#define UM_SYSCALL_ARG2(r) UM_REG(r, PT_R4)
-#define UM_SYSCALL_ARG3(r) UM_REG(r, PT_R5)
-#define UM_SYSCALL_ARG4(r) UM_REG(r, PT_R6)
-#define UM_SYSCALL_ARG5(r) UM_REG(r, PT_R7)
-#define UM_SYSCALL_ARG6(r) UM_REG(r, PT_R8)
-
-#define UM_SYSCALL_NR_OFFSET (PT_R0 * sizeof(PPC_REG))
-#define UM_SYSCALL_RET_OFFSET (PT_R3 * sizeof(PPC_REG))
-#define UM_SYSCALL_ARG1_OFFSET (PT_R3 * sizeof(PPC_REG))
-#define UM_SYSCALL_ARG2_OFFSET (PT_R4 * sizeof(PPC_REG))
-#define UM_SYSCALL_ARG3_OFFSET (PT_R5 * sizeof(PPC_REG))
-#define UM_SYSCALL_ARG4_OFFSET (PT_R6 * sizeof(PPC_REG))
-#define UM_SYSCALL_ARG5_OFFSET (PT_R7 * sizeof(PPC_REG))
-#define UM_SYSCALL_ARG6_OFFSET (PT_R8 * sizeof(PPC_REG))
-#define UM_SP_OFFSET (PT_R1 * sizeof(PPC_REG))
-#define UM_IP_OFFSET (PT_NIP * sizeof(PPC_REG))
-#define UM_ELF_ZERO_OFFSET (PT_R3 * sizeof(PPC_REG))
-
-#define UM_SET_SYSCALL_RETURN(_regs, result)	        \
-do {                                                    \
-        if (result < 0) {				\
-		(_regs)->regs[PT_CCR] |= 0x10000000;	\
-		UM_SYSCALL_RET((_regs)) = -result;	\
-        } else {					\
-		UM_SYSCALL_RET((_regs)) = result;	\
-        }                                               \
-} while(0)
-
-extern void shove_aux_table(unsigned long sp);
-#define UM_FIX_EXEC_STACK(sp) shove_aux_table(sp);
-
-/* These aren't actually defined.  The undefs are just to make sure
- * everyone's clear on the concept.
- */
-#undef UML_HAVE_GETREGS
-#undef UML_HAVE_GETFPREGS
-#undef UML_HAVE_SETREGS
-#undef UML_HAVE_SETFPREGS
-
-#endif
-

arch/um/sys-ppc/shared/sysdep/sigcontext.h

@@ -1,52 +0,0 @@
-/* 
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYS_SIGCONTEXT_PPC_H
-#define __SYS_SIGCONTEXT_PPC_H
-
-#define DSISR_WRITE 0x02000000
-
-#define SC_FAULT_ADDR(sc) ({ \
-		struct sigcontext *_sc = (sc); \
-		long retval = -1; \
-		switch (_sc->regs->trap) { \
-		case 0x300: \
-			/* data exception */ \
-			retval = _sc->regs->dar; \
-			break; \
-		case 0x400: \
-			/* instruction exception */ \
-			retval = _sc->regs->nip; \
-			break; \
-		default: \
-			panic("SC_FAULT_ADDR: unhandled trap type\n"); \
-		} \
-		retval; \
-	})
-
-#define SC_FAULT_WRITE(sc) ({ \
-		struct sigcontext *_sc = (sc); \
-		long retval = -1; \
-		switch (_sc->regs->trap) { \
-		case 0x300: \
-			/* data exception */ \
-			retval = !!(_sc->regs->dsisr & DSISR_WRITE); \
-			break; \
-		case 0x400: \
-			/* instruction exception: not a write */ \
-			retval = 0; \
-			break; \
-		default: \
-			panic("SC_FAULT_ADDR: unhandled trap type\n"); \
-		} \
-		retval; \
-	})
-
-#define SC_IP(sc) ((sc)->regs->nip)
-#define SC_SP(sc) ((sc)->regs->gpr[1])
-#define SEGV_IS_FIXABLE(sc) (1)
-
-#endif
-

arch/um/sys-ppc/shared/sysdep/skas_ptrace.h

@@ -1,22 +0,0 @@
-/*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYSDEP_PPC_SKAS_PTRACE_H
-#define __SYSDEP_PPC_SKAS_PTRACE_H
-
-struct ptrace_faultinfo {
-        int is_write;
-        unsigned long addr;
-};
-
-struct ptrace_ldt {
-        int func;
-        void *ptr;
-        unsigned long bytecount;
-};
-
-#define PTRACE_LDT 54
-
-#endif

arch/um/sys-ppc/shared/sysdep/syscalls.h

@@ -1,43 +0,0 @@
-/* 
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-typedef long syscall_handler_t(unsigned long arg1, unsigned long arg2,
-			       unsigned long arg3, unsigned long arg4,
-			       unsigned long arg5, unsigned long arg6);
-
-#define EXECUTE_SYSCALL(syscall, regs) \
-        (*sys_call_table[syscall])(UM_SYSCALL_ARG1(&regs), \
-			           UM_SYSCALL_ARG2(&regs), \
-				   UM_SYSCALL_ARG3(&regs), \
-				   UM_SYSCALL_ARG4(&regs), \
-				   UM_SYSCALL_ARG5(&regs), \
-				   UM_SYSCALL_ARG6(&regs))
-
-extern syscall_handler_t sys_mincore;
-extern syscall_handler_t sys_madvise;
-
-/* old_mmap needs the correct prototype since syscall_kern.c includes
- * this file.
- */
-int old_mmap(unsigned long addr, unsigned long len,
-	     unsigned long prot, unsigned long flags,
-	     unsigned long fd, unsigned long offset);
-
-#define ARCH_SYSCALLS \
-	[ __NR_modify_ldt ] = sys_ni_syscall, \
-	[ __NR_pciconfig_read ] = sys_ni_syscall, \
-	[ __NR_pciconfig_write ] = sys_ni_syscall, \
-	[ __NR_pciconfig_iobase ] = sys_ni_syscall, \
-	[ __NR_pivot_root ] = sys_ni_syscall, \
-	[ __NR_multiplexer ] = sys_ni_syscall, \
-	[ __NR_mmap ] = old_mmap, \
-	[ __NR_madvise ] = sys_madvise, \
-	[ __NR_mincore ] = sys_mincore, \
-	[ __NR_iopl ] = (syscall_handler_t *) sys_ni_syscall, \
-	[ __NR_utimes ] = (syscall_handler_t *) sys_utimes, \
-	[ __NR_fadvise64 ] = (syscall_handler_t *) sys_fadvise64,
-
-#define LAST_ARCH_SYSCALL __NR_fadvise64
-

arch/um/sys-ppc/sigcontext.c

@@ -1,4 +0,0 @@
-#include "asm/ptrace.h"
-#include "asm/sigcontext.h"
-#include <sysdep/ptrace.h>
-

arch/um/sys-ppc/sysrq.c

@@ -1,33 +0,0 @@
-/* 
- * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
- * Licensed under the GPL
- */
-
-#include <linux/kernel.h>
-#include <linux/smp.h>
-#include "asm/ptrace.h"
-#include "sysrq.h"
-
-void show_regs(struct pt_regs_subarch *regs)
-{
-	printk("\n");
-	show_regs_print_info(KERN_DEFAULT);
-
-	printk("show_regs(): insert regs here.\n");
-#if 0
-        printk("\n");
-        printk("EIP: %04x:[<%08lx>] CPU: %d",0xffff & regs->xcs, regs->eip,
-	       smp_processor_id());
-        if (regs->xcs & 3)
-                printk(" ESP: %04x:%08lx",0xffff & regs->xss, regs->esp);
-        printk(" EFLAGS: %08lx\n", regs->eflags);
-        printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
-                regs->eax, regs->ebx, regs->ecx, regs->edx);
-        printk("ESI: %08lx EDI: %08lx EBP: %08lx",
-                regs->esi, regs->edi, regs->ebp);
-        printk(" DS: %04x ES: %04x\n",
-                0xffff & regs->xds, 0xffff & regs->xes);
-#endif
-
-        show_trace(current, &regs->gpr[1]);
-}

arch/x86/um/Makefile

@@ -21,7 +21,6 @@ obj-$(CONFIG_BINFMT_ELF) += elfcore.o
 
 subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o
 subarch-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += ../lib/rwsem.o
-subarch-$(CONFIG_HIGHMEM) += ../mm/highmem_32.o
 
 else
 

arch/x86/um/asm/barrier.h

@@ -36,22 +36,11 @@
 #endif /* CONFIG_X86_PPRO_FENCE */
 #define dma_wmb()	barrier()
 
-#ifdef CONFIG_SMP
-
-#define smp_mb()	mb()
-#define smp_rmb()	dma_rmb()
-#define smp_wmb()	barrier()
-#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
-
-#else /* CONFIG_SMP */
-
 #define smp_mb()	barrier()
 #define smp_rmb()	barrier()
 #define smp_wmb()	barrier()
 #define set_mb(var, value) do { var = value; barrier(); } while (0)
 
-#endif /* CONFIG_SMP */
-
 #define read_barrier_depends()		do { } while (0)
 #define smp_read_barrier_depends()	do { } while (0)
 

arch/x86/um/asm/elf.h

@@ -210,7 +210,7 @@ extern int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu);
 
 #define ELF_EXEC_PAGESIZE 4096
 
-#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
+#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
 
 extern long elf_aux_hwcap;
 #define ELF_HWCAP (elf_aux_hwcap)

arch/x86/um/ldt.c

@@ -8,9 +8,7 @@
 #include <linux/slab.h>
 #include <asm/unistd.h>
 #include <os.h>
-#include <proc_mm.h>
 #include <skas.h>
-#include <skas_ptrace.h>
 #include <sysdep/tls.h>
 
 extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
@@ -19,105 +17,20 @@ static long write_ldt_entry(struct mm_id *mm_idp, int func,
 		     struct user_desc *desc, void **addr, int done)
 {
 	long res;
-
-	if (proc_mm) {
-		/*
-		 * This is a special handling for the case, that the mm to
-		 * modify isn't current->active_mm.
-		 * If this is called directly by modify_ldt,
-		 *     (current->active_mm->context.skas.u == mm_idp)
-		 * will be true. So no call to __switch_mm(mm_idp) is done.
-		 * If this is called in case of init_new_ldt or PTRACE_LDT,
-		 * mm_idp won't belong to current->active_mm, but child->mm.
-		 * So we need to switch child's mm into our userspace, then
-		 * later switch back.
-		 *
-		 * Note: I'm unsure: should interrupts be disabled here?
-		 */
-		if (!current->active_mm || current->active_mm == &init_mm ||
-		    mm_idp != &current->active_mm->context.id)
-			__switch_mm(mm_idp);
-	}
-
-	if (ptrace_ldt) {
-		struct ptrace_ldt ldt_op = (struct ptrace_ldt) {
-			.func = func,
-			.ptr = desc,
-			.bytecount = sizeof(*desc)};
-		u32 cpu;
-		int pid;
-
-		if (!proc_mm)
-			pid = mm_idp->u.pid;
-		else {
-			cpu = get_cpu();
-			pid = userspace_pid[cpu];
-		}
-
-		res = os_ptrace_ldt(pid, 0, (unsigned long) &ldt_op);
-
-		if (proc_mm)
-			put_cpu();
-	}
-	else {
-		void *stub_addr;
-		res = syscall_stub_data(mm_idp, (unsigned long *)desc,
-					(sizeof(*desc) + sizeof(long) - 1) &
-					    ~(sizeof(long) - 1),
-					addr, &stub_addr);
-		if (!res) {
-			unsigned long args[] = { func,
-						 (unsigned long)stub_addr,
-						 sizeof(*desc),
-						 0, 0, 0 };
-			res = run_syscall_stub(mm_idp, __NR_modify_ldt, args,
-					       0, addr, done);
-		}
+	void *stub_addr;
+	res = syscall_stub_data(mm_idp, (unsigned long *)desc,
+				(sizeof(*desc) + sizeof(long) - 1) &
+				    ~(sizeof(long) - 1),
+				addr, &stub_addr);
+	if (!res) {
+		unsigned long args[] = { func,
+					 (unsigned long)stub_addr,
+					 sizeof(*desc),
+					 0, 0, 0 };
+		res = run_syscall_stub(mm_idp, __NR_modify_ldt, args,
+				       0, addr, done);
 	}
 
-	if (proc_mm) {
-		/*
-		 * This is the second part of special handling, that makes
-		 * PTRACE_LDT possible to implement.
-		 */
-		if (current->active_mm && current->active_mm != &init_mm &&
-		    mm_idp != &current->active_mm->context.id)
-			__switch_mm(&current->active_mm->context.id);
-	}
-
-	return res;
-}
-
-static long read_ldt_from_host(void __user * ptr, unsigned long bytecount)
-{
-	int res, n;
-	struct ptrace_ldt ptrace_ldt = (struct ptrace_ldt) {
-			.func = 0,
-			.bytecount = bytecount,
-			.ptr = kmalloc(bytecount, GFP_KERNEL)};
-	u32 cpu;
-
-	if (ptrace_ldt.ptr == NULL)
-		return -ENOMEM;
-
-	/*
-	 * This is called from sys_modify_ldt only, so userspace_pid gives
-	 * us the right number
-	 */
-
-	cpu = get_cpu();
-	res = os_ptrace_ldt(userspace_pid[cpu], 0, (unsigned long) &ptrace_ldt);
-	put_cpu();
-	if (res < 0)
-		goto out;
-
-	n = copy_to_user(ptr, ptrace_ldt.ptr, res);
-	if (n != 0)
-		res = -EFAULT;
-
-  out:
-	kfree(ptrace_ldt.ptr);
-
 	return res;
 }
 
@@ -145,9 +58,6 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
 		bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
 	err = bytecount;
 
-	if (ptrace_ldt)
-		return read_ldt_from_host(ptr, bytecount);
-
 	mutex_lock(&ldt->lock);
 	if (ldt->entry_count <= LDT_DIRECT_ENTRIES) {
 		size = LDT_ENTRY_SIZE*LDT_DIRECT_ENTRIES;
@@ -229,17 +139,11 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
 			goto out;
 	}
 
-	if (!ptrace_ldt)
-		mutex_lock(&ldt->lock);
+	mutex_lock(&ldt->lock);
 
 	err = write_ldt_entry(mm_idp, func, &ldt_info, &addr, 1);
 	if (err)
 		goto out_unlock;
-	else if (ptrace_ldt) {
-		/* With PTRACE_LDT available, this is used as a flag only */
-		ldt->entry_count = 1;
-		goto out;
-	}
 
 	if (ldt_info.entry_number >= ldt->entry_count &&
 	    ldt_info.entry_number >= LDT_DIRECT_ENTRIES) {
@@ -393,91 +297,56 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
 	int i;
 	long page, err=0;
 	void *addr = NULL;
-	struct proc_mm_op copy;
 
 
-	if (!ptrace_ldt)
-		mutex_init(&new_mm->arch.ldt.lock);
+	mutex_init(&new_mm->arch.ldt.lock);
 
 	if (!from_mm) {
 		memset(&desc, 0, sizeof(desc));
 		/*
-		 * We have to initialize a clean ldt.
+		 * Now we try to retrieve info about the ldt, we
+		 * inherited from the host. All ldt-entries found
+		 * will be reset in the following loop
 		 */
-		if (proc_mm) {
-			/*
-			 * If the new mm was created using proc_mm, host's
-			 * default-ldt currently is assigned, which normally
-			 * contains the call-gates for lcall7 and lcall27.
-			 * To remove these gates, we simply write an empty
-			 * entry as number 0 to the host.
-			 */
-			err = write_ldt_entry(&new_mm->id, 1, &desc, &addr, 1);
-		}
-		else{
-			/*
-			 * Now we try to retrieve info about the ldt, we
-			 * inherited from the host. All ldt-entries found
-			 * will be reset in the following loop
-			 */
-			ldt_get_host_info();
-			for (num_p=host_ldt_entries; *num_p != -1; num_p++) {
-				desc.entry_number = *num_p;
-				err = write_ldt_entry(&new_mm->id, 1, &desc,
-						      &addr, *(num_p + 1) == -1);
-				if (err)
-					break;
-			}
+		ldt_get_host_info();
+		for (num_p=host_ldt_entries; *num_p != -1; num_p++) {
+			desc.entry_number = *num_p;
+			err = write_ldt_entry(&new_mm->id, 1, &desc,
+					      &addr, *(num_p + 1) == -1);
+			if (err)
+				break;
 		}
 		new_mm->arch.ldt.entry_count = 0;
 
 		goto out;
 	}
 
-	if (proc_mm) {
-		/*
-		 * We have a valid from_mm, so we now have to copy the LDT of
-		 * from_mm to new_mm, because using proc_mm an new mm with
-		 * an empty/default LDT was created in new_mm()
-		 */
-		copy = ((struct proc_mm_op) { .op 	= MM_COPY_SEGMENTS,
-					      .u 	=
-					      { .copy_segments =
-							from_mm->id.u.mm_fd } } );
-		i = os_write_file(new_mm->id.u.mm_fd, &copy, sizeof(copy));
-		if (i != sizeof(copy))
-			printk(KERN_ERR "new_mm : /proc/mm copy_segments "
-			       "failed, err = %d\n", -i);
-	}
-
-	if (!ptrace_ldt) {
-		/*
-		 * Our local LDT is used to supply the data for
-		 * modify_ldt(READLDT), if PTRACE_LDT isn't available,
-		 * i.e., we have to use the stub for modify_ldt, which
-		 * can't handle the big read buffer of up to 64kB.
-		 */
-		mutex_lock(&from_mm->arch.ldt.lock);
-		if (from_mm->arch.ldt.entry_count <= LDT_DIRECT_ENTRIES)
-			memcpy(new_mm->arch.ldt.u.entries, from_mm->arch.ldt.u.entries,
-			       sizeof(new_mm->arch.ldt.u.entries));
-		else {
-			i = from_mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
-			while (i-->0) {
-				page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
-				if (!page) {
-					err = -ENOMEM;
-					break;
-				}
-				new_mm->arch.ldt.u.pages[i] =
-					(struct ldt_entry *) page;
-				memcpy(new_mm->arch.ldt.u.pages[i],
-				       from_mm->arch.ldt.u.pages[i], PAGE_SIZE);
+	/*
+	 * Our local LDT is used to supply the data for
+	 * modify_ldt(READLDT), if PTRACE_LDT isn't available,
+	 * i.e., we have to use the stub for modify_ldt, which
+	 * can't handle the big read buffer of up to 64kB.
+	 */
+	mutex_lock(&from_mm->arch.ldt.lock);
+	if (from_mm->arch.ldt.entry_count <= LDT_DIRECT_ENTRIES)
+		memcpy(new_mm->arch.ldt.u.entries, from_mm->arch.ldt.u.entries,
+		       sizeof(new_mm->arch.ldt.u.entries));
+	else {
+		i = from_mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
+		while (i-->0) {
+			page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
+			if (!page) {
+				err = -ENOMEM;
+				break;
 			}
+			new_mm->arch.ldt.u.pages[i] =
+				(struct ldt_entry *) page;
+			memcpy(new_mm->arch.ldt.u.pages[i],
+			       from_mm->arch.ldt.u.pages[i], PAGE_SIZE);
 		}
-		new_mm->arch.ldt.entry_count = from_mm->arch.ldt.entry_count;
-		mutex_unlock(&from_mm->arch.ldt.lock);
 	}
+	new_mm->arch.ldt.entry_count = from_mm->arch.ldt.entry_count;
+	mutex_unlock(&from_mm->arch.ldt.lock);
 
     out:
 	return err;
@@ -488,7 +357,7 @@ void free_ldt(struct mm_context *mm)
 {
 	int i;
 
-	if (!ptrace_ldt && mm->arch.ldt.entry_count > LDT_DIRECT_ENTRIES) {
+	if (mm->arch.ldt.entry_count > LDT_DIRECT_ENTRIES) {
 		i = mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
 		while (i-- > 0)
 			free_page((long) mm->arch.ldt.u.pages[i]);

arch/x86/um/shared/sysdep/faultinfo_32.h

@@ -27,9 +27,6 @@ struct faultinfo {
 /* This is Page Fault */
 #define SEGV_IS_FIXABLE(fi)	((fi)->trap_no == 14)
 
-/* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
-#define SEGV_MAYBE_FIXABLE(fi)	((fi)->trap_no == 0 && ptrace_faultinfo)
-
 #define PTRACE_FULL_FAULTINFO 0
 
 #endif

arch/x86/um/shared/sysdep/faultinfo_64.h

@@ -27,9 +27,6 @@ struct faultinfo {
 /* This is Page Fault */
 #define SEGV_IS_FIXABLE(fi)	((fi)->trap_no == 14)
 
-/* No broken SKAS API, which doesn't pass trap_no, here. */
-#define SEGV_MAYBE_FIXABLE(fi)	0
-
 #define PTRACE_FULL_FAULTINFO 1
 
 #endif

arch/x86/um/shared/sysdep/skas_ptrace.h

@@ -1,22 +0,0 @@
-/*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SYSDEP_X86_SKAS_PTRACE_H
-#define __SYSDEP_X86_SKAS_PTRACE_H
-
-struct ptrace_faultinfo {
-        int is_write;
-        unsigned long addr;
-};
-
-struct ptrace_ldt {
-        int func;
-        void *ptr;
-        unsigned long bytecount;
-};
-
-#define PTRACE_LDT 54
-
-#endif

fs/hostfs/hostfs.h

@@ -66,7 +66,8 @@ extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
 extern int access_file(char *path, int r, int w, int x);
 extern int open_file(char *path, int r, int w, int append);
 extern void *open_dir(char *path, int *err_out);
-extern char *read_dir(void *stream, unsigned long long *pos,
+extern void seek_dir(void *stream, unsigned long long pos);
+extern char *read_dir(void *stream, unsigned long long *pos_out,
 		      unsigned long long *ino_out, int *len_out,
 		      unsigned int *type_out);
 extern void close_file(void *stream);
@@ -77,8 +78,7 @@ extern int write_file(int fd, unsigned long long *offset, const char *buf,
 		      int len);
 extern int lseek_file(int fd, long long offset, int whence);
 extern int fsync_file(int fd, int datasync);
-extern int file_create(char *name, int ur, int uw, int ux, int gr,
-		       int gw, int gx, int or, int ow, int ox);
+extern int file_create(char *name, int mode);
 extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
 extern int make_symlink(const char *from, const char *to);
 extern int unlink_file(const char *file);

fs/hostfs/hostfs_kern.c

@@ -24,6 +24,7 @@ struct hostfs_inode_info {
 	int fd;
 	fmode_t mode;
 	struct inode vfs_inode;
+	struct mutex open_mutex;
 };
 
 static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
@@ -92,16 +93,22 @@ static char *__dentry_name(struct dentry *dentry, char *name)
 		__putname(name);
 		return NULL;
 	}
+
+	/*
+	 * This function relies on the fact that dentry_path_raw() will place
+	 * the path name at the end of the provided buffer.
+	 */
+	BUG_ON(p + strlen(p) + 1 != name + PATH_MAX);
+
 	strlcpy(name, root, PATH_MAX);
 	if (len > p - name) {
 		__putname(name);
 		return NULL;
 	}
-	if (p > name + len) {
-		char *s = name + len;
-		while ((*s++ = *p++) != '\0')
-			;
-	}
+
+	if (p > name + len)
+		strcpy(name + len, p);
+
 	return name;
 }
 
@@ -135,21 +142,19 @@ static char *follow_link(char *link)
 	int len, n;
 	char *name, *resolved, *end;
 
-	len = 64;
-	while (1) {
+	name = __getname();
+	if (!name) {
 		n = -ENOMEM;
-		name = kmalloc(len, GFP_KERNEL);
-		if (name == NULL)
-			goto out;
-
-		n = hostfs_do_readlink(link, name, len);
-		if (n < len)
-			break;
-		len *= 2;
-		kfree(name);
+		goto out_free;
 	}
+
+	n = hostfs_do_readlink(link, name, PATH_MAX);
 	if (n < 0)
 		goto out_free;
+	else if (n == PATH_MAX) {
+		n = -E2BIG;
+		goto out_free;
+	}
 
 	if (*name == '/')
 		return name;
@@ -168,13 +173,12 @@ static char *follow_link(char *link)
 	}
 
 	sprintf(resolved, "%s%s", link, name);
-	kfree(name);
+	__putname(name);
 	kfree(link);
 	return resolved;
 
  out_free:
-	kfree(name);
- out:
+	__putname(name);
 	return ERR_PTR(n);
 }
 
@@ -225,6 +229,7 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
 	hi->fd = -1;
 	hi->mode = 0;
 	inode_init_once(&hi->vfs_inode);
+	mutex_init(&hi->open_mutex);
 	return &hi->vfs_inode;
 }
 
@@ -257,6 +262,9 @@ static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
 	if (strlen(root_path) > offset)
 		seq_printf(seq, ",%s", root_path + offset);
 
+	if (append)
+		seq_puts(seq, ",append");
+
 	return 0;
 }
 
@@ -284,6 +292,7 @@ static int hostfs_readdir(struct file *file, struct dir_context *ctx)
 	if (dir == NULL)
 		return -error;
 	next = ctx->pos;
+	seek_dir(dir, next);
 	while ((name = read_dir(dir, &next, &ino, &len, &type)) != NULL) {
 		if (!dir_emit(ctx, name, len, ino, type))
 			break;
@@ -293,13 +302,12 @@ static int hostfs_readdir(struct file *file, struct dir_context *ctx)
 	return 0;
 }
 
-static int hostfs_file_open(struct inode *ino, struct file *file)
+static int hostfs_open(struct inode *ino, struct file *file)
 {
-	static DEFINE_MUTEX(open_mutex);
 	char *name;
-	fmode_t mode = 0;
+	fmode_t mode;
 	int err;
-	int r = 0, w = 0, fd;
+	int r, w, fd;
 
 	mode = file->f_mode & (FMODE_READ | FMODE_WRITE);
 	if ((mode & HOSTFS_I(ino)->mode) == mode)
@@ -308,12 +316,12 @@ static int hostfs_file_open(struct inode *ino, struct file *file)
 	mode |= HOSTFS_I(ino)->mode;
 
 retry:
+	r = w = 0;
+
 	if (mode & FMODE_READ)
 		r = 1;
 	if (mode & FMODE_WRITE)
-		w = 1;
-	if (w)
-		r = 1;
+		r = w = 1;
 
 	name = dentry_name(file->f_path.dentry);
 	if (name == NULL)
@@ -324,15 +332,16 @@ retry:
 	if (fd < 0)
 		return fd;
 
-	mutex_lock(&open_mutex);
+	mutex_lock(&HOSTFS_I(ino)->open_mutex);
 	/* somebody else had handled it first? */
 	if ((mode & HOSTFS_I(ino)->mode) == mode) {
-		mutex_unlock(&open_mutex);
+		mutex_unlock(&HOSTFS_I(ino)->open_mutex);
+		close_file(&fd);
 		return 0;
 	}
 	if ((mode | HOSTFS_I(ino)->mode) != mode) {
 		mode |= HOSTFS_I(ino)->mode;
-		mutex_unlock(&open_mutex);
+		mutex_unlock(&HOSTFS_I(ino)->open_mutex);
 		close_file(&fd);
 		goto retry;
 	}
@@ -342,12 +351,12 @@ retry:
 		err = replace_file(fd, HOSTFS_I(ino)->fd);
 		close_file(&fd);
 		if (err < 0) {
-			mutex_unlock(&open_mutex);
+			mutex_unlock(&HOSTFS_I(ino)->open_mutex);
 			return err;
 		}
 	}
 	HOSTFS_I(ino)->mode = mode;
-	mutex_unlock(&open_mutex);
+	mutex_unlock(&HOSTFS_I(ino)->open_mutex);
 
 	return 0;
 }
@@ -382,7 +391,7 @@ static const struct file_operations hostfs_file_fops = {
 	.read_iter	= generic_file_read_iter,
 	.write_iter	= generic_file_write_iter,
 	.mmap		= generic_file_mmap,
-	.open		= hostfs_file_open,
+	.open		= hostfs_open,
 	.release	= hostfs_file_release,
 	.fsync		= hostfs_fsync,
 };
@@ -391,6 +400,8 @@ static const struct file_operations hostfs_dir_fops = {
 	.llseek		= generic_file_llseek,
 	.iterate	= hostfs_readdir,
 	.read		= generic_read_dir,
+	.open		= hostfs_open,
+	.fsync		= hostfs_fsync,
 };
 
 static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
@@ -398,7 +409,7 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
 	struct address_space *mapping = page->mapping;
 	struct inode *inode = mapping->host;
 	char *buffer;
-	unsigned long long base;
+	loff_t base = page_offset(page);
 	int count = PAGE_CACHE_SIZE;
 	int end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 	int err;
@@ -407,7 +418,6 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
 		count = inode->i_size & (PAGE_CACHE_SIZE-1);
 
 	buffer = kmap(page);
-	base = ((unsigned long long) page->index) << PAGE_CACHE_SHIFT;
 
 	err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
 	if (err != count) {
@@ -432,26 +442,29 @@ static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
 static int hostfs_readpage(struct file *file, struct page *page)
 {
 	char *buffer;
-	long long start;
-	int err = 0;
+	loff_t start = page_offset(page);
+	int bytes_read, ret = 0;
 
-	start = (long long) page->index << PAGE_CACHE_SHIFT;
 	buffer = kmap(page);
-	err = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
+	bytes_read = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
 			PAGE_CACHE_SIZE);
-	if (err < 0)
+	if (bytes_read < 0) {
+		ClearPageUptodate(page);
+		SetPageError(page);
+		ret = bytes_read;
 		goto out;
+	}
 
-	memset(&buffer[err], 0, PAGE_CACHE_SIZE - err);
+	memset(buffer + bytes_read, 0, PAGE_CACHE_SIZE - bytes_read);
 
-	flush_dcache_page(page);
+	ClearPageError(page);
 	SetPageUptodate(page);
-	if (PageError(page)) ClearPageError(page);
-	err = 0;
+
  out:
+	flush_dcache_page(page);
 	kunmap(page);
 	unlock_page(page);
-	return err;
+	return ret;
 }
 
 static int hostfs_write_begin(struct file *file, struct address_space *mapping,
@@ -528,11 +541,13 @@ static int read_name(struct inode *ino, char *name)
 		init_special_inode(ino, st.mode & S_IFMT, rdev);
 		ino->i_op = &hostfs_iops;
 		break;
-
-	default:
+	case S_IFREG:
 		ino->i_op = &hostfs_iops;
 		ino->i_fop = &hostfs_file_fops;
 		ino->i_mapping->a_ops = &hostfs_aops;
+		break;
+	default:
+		return -EIO;
 	}
 
 	ino->i_ino = st.ino;
@@ -566,10 +581,7 @@ static int hostfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	if (name == NULL)
 		goto out_put;
 
-	fd = file_create(name,
-			 mode & S_IRUSR, mode & S_IWUSR, mode & S_IXUSR,
-			 mode & S_IRGRP, mode & S_IWGRP, mode & S_IXGRP,
-			 mode & S_IROTH, mode & S_IWOTH, mode & S_IXOTH);
+	fd = file_create(name, mode & S_IFMT);
 	if (fd < 0)
 		error = fd;
 	else

fs/hostfs/hostfs_user.c

@@ -97,21 +97,27 @@ void *open_dir(char *path, int *err_out)
 	return dir;
 }
 
-char *read_dir(void *stream, unsigned long long *pos,
+void seek_dir(void *stream, unsigned long long pos)
+{
+	DIR *dir = stream;
+
+	seekdir(dir, pos);
+}
+
+char *read_dir(void *stream, unsigned long long *pos_out,
 	       unsigned long long *ino_out, int *len_out,
 	       unsigned int *type_out)
 {
 	DIR *dir = stream;
 	struct dirent *ent;
 
-	seekdir(dir, *pos);
 	ent = readdir(dir);
 	if (ent == NULL)
 		return NULL;
 	*len_out = strlen(ent->d_name);
 	*ino_out = ent->d_ino;
 	*type_out = ent->d_type;
-	*pos = telldir(dir);
+	*pos_out = ent->d_off;
 	return ent->d_name;
 }
 
@@ -175,21 +181,10 @@ void close_dir(void *stream)
 	closedir(stream);
 }
 
-int file_create(char *name, int ur, int uw, int ux, int gr,
-		int gw, int gx, int or, int ow, int ox)
+int file_create(char *name, int mode)
 {
-	int mode, fd;
-
-	mode = 0;
-	mode |= ur ? S_IRUSR : 0;
-	mode |= uw ? S_IWUSR : 0;
-	mode |= ux ? S_IXUSR : 0;
-	mode |= gr ? S_IRGRP : 0;
-	mode |= gw ? S_IWGRP : 0;
-	mode |= gx ? S_IXGRP : 0;
-	mode |= or ? S_IROTH : 0;
-	mode |= ow ? S_IWOTH : 0;
-	mode |= ox ? S_IXOTH : 0;
+	int fd;
+
 	fd = open64(name, O_CREAT | O_RDWR, mode);
 	if (fd < 0)
 		return -errno;