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@@ -0,0 +1,670 @@
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+#include <sys/types.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <fcntl.h>
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+#include <unistd.h>
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+#include <inttypes.h>
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+#include <byteswap.h>
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+#include <sys/stat.h>
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+#include <sys/mman.h>
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+
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+#include "util.h"
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+#include "event.h"
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+#include "debug.h"
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+#include "evlist.h"
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+#include "symbol.h"
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+#include "strlist.h"
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+#include <elf.h>
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+
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+#include "session.h"
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+#include "jit.h"
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+#include "jitdump.h"
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+#include "genelf.h"
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+#include "../builtin.h"
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+
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+struct jit_buf_desc {
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+ struct perf_data_file *output;
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+ struct perf_session *session;
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+ struct machine *machine;
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+ union jr_entry *entry;
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+ void *buf;
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+ uint64_t sample_type;
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+ size_t bufsize;
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+ FILE *in;
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+ bool needs_bswap; /* handles cross-endianess */
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+ void *debug_data;
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+ size_t nr_debug_entries;
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+ uint32_t code_load_count;
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+ u64 bytes_written;
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+ struct rb_root code_root;
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+ char dir[PATH_MAX];
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+};
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+
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+struct debug_line_info {
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+ unsigned long vma;
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+ unsigned int lineno;
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+ /* The filename format is unspecified, absolute path, relative etc. */
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+ char const filename[0];
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+};
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+
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+struct jit_tool {
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+ struct perf_tool tool;
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+ struct perf_data_file output;
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+ struct perf_data_file input;
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+ u64 bytes_written;
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+};
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+
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+#define hmax(a, b) ((a) > (b) ? (a) : (b))
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+#define get_jit_tool(t) (container_of(tool, struct jit_tool, tool))
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+
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+static int
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+jit_emit_elf(char *filename,
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+ const char *sym,
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+ uint64_t code_addr,
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+ const void *code,
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+ int csize)
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+{
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+ int ret, fd;
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+
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+ if (verbose > 0)
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+ fprintf(stderr, "write ELF image %s\n", filename);
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+
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+ fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY, 0644);
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+ if (fd == -1) {
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+ pr_warning("cannot create jit ELF %s: %s\n", filename, strerror(errno));
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+ return -1;
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+ }
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+
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+ ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize);
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+
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+ close(fd);
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+
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+ if (ret)
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+ unlink(filename);
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+
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+ return ret;
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+}
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+
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+static void
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+jit_close(struct jit_buf_desc *jd)
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+{
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+ if (!(jd && jd->in))
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+ return;
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+ funlockfile(jd->in);
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+ fclose(jd->in);
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+ jd->in = NULL;
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+}
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+
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+static int
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+jit_open(struct jit_buf_desc *jd, const char *name)
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+{
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+ struct jitheader header;
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+ struct jr_prefix *prefix;
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+ ssize_t bs, bsz = 0;
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+ void *n, *buf = NULL;
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+ int ret, retval = -1;
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+
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+ jd->in = fopen(name, "r");
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+ if (!jd->in)
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+ return -1;
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+
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+ bsz = hmax(sizeof(header), sizeof(*prefix));
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+
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+ buf = malloc(bsz);
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+ if (!buf)
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+ goto error;
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+
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+ /*
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+ * protect from writer modifying the file while we are reading it
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+ */
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+ flockfile(jd->in);
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+
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+ ret = fread(buf, sizeof(header), 1, jd->in);
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+ if (ret != 1)
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+ goto error;
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+
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+ memcpy(&header, buf, sizeof(header));
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+
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+ if (header.magic != JITHEADER_MAGIC) {
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+ if (header.magic != JITHEADER_MAGIC_SW)
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+ goto error;
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+ jd->needs_bswap = true;
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+ }
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+
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+ if (jd->needs_bswap) {
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+ header.version = bswap_32(header.version);
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+ header.total_size = bswap_32(header.total_size);
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+ header.pid = bswap_32(header.pid);
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+ header.elf_mach = bswap_32(header.elf_mach);
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+ header.timestamp = bswap_64(header.timestamp);
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+ header.flags = bswap_64(header.flags);
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+ }
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+
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+ if (verbose > 2)
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+ pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\n",
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+ header.version,
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+ header.total_size,
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+ (unsigned long long)header.timestamp,
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+ header.pid,
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+ header.elf_mach);
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+
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+ if (header.flags & JITDUMP_FLAGS_RESERVED) {
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+ pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n",
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+ (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED);
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+ goto error;
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+ }
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+
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+ bs = header.total_size - sizeof(header);
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+
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+ if (bs > bsz) {
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+ n = realloc(buf, bs);
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+ if (!n)
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+ goto error;
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+ bsz = bs;
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+ buf = n;
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+ /* read extra we do not know about */
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+ ret = fread(buf, bs - bsz, 1, jd->in);
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+ if (ret != 1)
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+ goto error;
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+ }
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+ /*
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+ * keep dirname for generating files and mmap records
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+ */
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+ strcpy(jd->dir, name);
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+ dirname(jd->dir);
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+
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+ return 0;
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+error:
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+ funlockfile(jd->in);
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+ fclose(jd->in);
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+ return retval;
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+}
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+
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+static union jr_entry *
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+jit_get_next_entry(struct jit_buf_desc *jd)
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+{
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+ struct jr_prefix *prefix;
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+ union jr_entry *jr;
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+ void *addr;
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+ size_t bs, size;
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+ int id, ret;
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+
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+ if (!(jd && jd->in))
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+ return NULL;
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+
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+ if (jd->buf == NULL) {
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+ size_t sz = getpagesize();
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+ if (sz < sizeof(*prefix))
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+ sz = sizeof(*prefix);
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+
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+ jd->buf = malloc(sz);
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+ if (jd->buf == NULL)
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+ return NULL;
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+
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+ jd->bufsize = sz;
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+ }
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+
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+ prefix = jd->buf;
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+
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+ /*
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+ * file is still locked at this point
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+ */
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+ ret = fread(prefix, sizeof(*prefix), 1, jd->in);
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+ if (ret != 1)
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+ return NULL;
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+
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+ if (jd->needs_bswap) {
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+ prefix->id = bswap_32(prefix->id);
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+ prefix->total_size = bswap_32(prefix->total_size);
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+ prefix->timestamp = bswap_64(prefix->timestamp);
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+ }
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+ id = prefix->id;
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+ size = prefix->total_size;
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+
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+ bs = (size_t)size;
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+ if (bs < sizeof(*prefix))
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+ return NULL;
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+
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+ if (id >= JIT_CODE_MAX) {
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+ pr_warning("next_entry: unknown prefix %d, skipping\n", id);
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+ return NULL;
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+ }
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+ if (bs > jd->bufsize) {
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+ void *n;
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+ n = realloc(jd->buf, bs);
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+ if (!n)
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+ return NULL;
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+ jd->buf = n;
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+ jd->bufsize = bs;
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+ }
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+
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+ addr = ((void *)jd->buf) + sizeof(*prefix);
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+
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+ ret = fread(addr, bs - sizeof(*prefix), 1, jd->in);
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+ if (ret != 1)
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+ return NULL;
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+
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+ jr = (union jr_entry *)jd->buf;
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+
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+ switch(id) {
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+ case JIT_CODE_DEBUG_INFO:
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+ if (jd->needs_bswap) {
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+ uint64_t n;
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+ jr->info.code_addr = bswap_64(jr->info.code_addr);
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+ jr->info.nr_entry = bswap_64(jr->info.nr_entry);
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+ for (n = 0 ; n < jr->info.nr_entry; n++) {
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+ jr->info.entries[n].addr = bswap_64(jr->info.entries[n].addr);
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+ jr->info.entries[n].lineno = bswap_32(jr->info.entries[n].lineno);
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+ jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim);
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+ }
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+ }
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+ break;
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+ case JIT_CODE_CLOSE:
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+ break;
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+ case JIT_CODE_LOAD:
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+ if (jd->needs_bswap) {
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+ jr->load.pid = bswap_32(jr->load.pid);
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+ jr->load.tid = bswap_32(jr->load.tid);
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+ jr->load.vma = bswap_64(jr->load.vma);
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+ jr->load.code_addr = bswap_64(jr->load.code_addr);
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+ jr->load.code_size = bswap_64(jr->load.code_size);
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+ jr->load.code_index= bswap_64(jr->load.code_index);
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+ }
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+ jd->code_load_count++;
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+ break;
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+ case JIT_CODE_MOVE:
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+ if (jd->needs_bswap) {
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+ jr->move.pid = bswap_32(jr->move.pid);
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+ jr->move.tid = bswap_32(jr->move.tid);
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+ jr->move.vma = bswap_64(jr->move.vma);
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+ jr->move.old_code_addr = bswap_64(jr->move.old_code_addr);
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+ jr->move.new_code_addr = bswap_64(jr->move.new_code_addr);
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+ jr->move.code_size = bswap_64(jr->move.code_size);
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+ jr->move.code_index = bswap_64(jr->move.code_index);
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+ }
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+ break;
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+ case JIT_CODE_MAX:
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+ default:
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+ return NULL;
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+ }
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+ return jr;
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+}
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+
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+static int
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+jit_inject_event(struct jit_buf_desc *jd, union perf_event *event)
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+{
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+ ssize_t size;
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+
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+ size = perf_data_file__write(jd->output, event, event->header.size);
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+ if (size < 0)
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+ return -1;
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+
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+ jd->bytes_written += size;
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+ return 0;
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+}
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+
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+static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)
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+{
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+ struct perf_sample sample;
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+ union perf_event *event;
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+ struct perf_tool *tool = jd->session->tool;
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+ uint64_t code, addr;
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+ uintptr_t uaddr;
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+ char *filename;
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+ struct stat st;
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+ size_t size;
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+ u16 idr_size;
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+ const char *sym;
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+ uint32_t count;
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+ int ret, csize;
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+ pid_t pid, tid;
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+ struct {
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+ u32 pid, tid;
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+ u64 time;
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+ } *id;
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+
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+ pid = jr->load.pid;
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+ tid = jr->load.tid;
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+ csize = jr->load.code_size;
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+ addr = jr->load.code_addr;
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+ sym = (void *)((unsigned long)jr + sizeof(jr->load));
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+ code = (unsigned long)jr + jr->load.p.total_size - csize;
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+ count = jr->load.code_index;
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+ idr_size = jd->machine->id_hdr_size;
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+
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+ event = calloc(1, sizeof(*event) + idr_size);
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+ if (!event)
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+ return -1;
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+
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+ filename = event->mmap2.filename;
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+ size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%u.so",
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+ jd->dir,
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+ pid,
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+ count);
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+
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+ size++; /* for \0 */
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+
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+ size = PERF_ALIGN(size, sizeof(u64));
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+ uaddr = (uintptr_t)code;
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+ ret = jit_emit_elf(filename, sym, addr, (const void *)uaddr, csize);
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+
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+ if (jd->debug_data && jd->nr_debug_entries) {
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+ free(jd->debug_data);
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+ jd->debug_data = NULL;
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+ jd->nr_debug_entries = 0;
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+ }
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+
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+ if (ret) {
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+ free(event);
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+ return -1;
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+ }
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+ if (stat(filename, &st))
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+ memset(&st, 0, sizeof(stat));
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+
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+ event->mmap2.header.type = PERF_RECORD_MMAP2;
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+ event->mmap2.header.misc = PERF_RECORD_MISC_USER;
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+ event->mmap2.header.size = (sizeof(event->mmap2) -
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+ (sizeof(event->mmap2.filename) - size) + idr_size);
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+
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+ event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
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+ event->mmap2.start = addr;
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+ event->mmap2.len = csize;
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+ event->mmap2.pid = pid;
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+ event->mmap2.tid = tid;
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+ event->mmap2.ino = st.st_ino;
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+ event->mmap2.maj = major(st.st_dev);
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+ event->mmap2.min = minor(st.st_dev);
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+ event->mmap2.prot = st.st_mode;
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+ event->mmap2.flags = MAP_SHARED;
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+ event->mmap2.ino_generation = 1;
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+
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+ id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
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+ if (jd->sample_type & PERF_SAMPLE_TID) {
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+ id->pid = pid;
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+ id->tid = tid;
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+ }
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+ if (jd->sample_type & PERF_SAMPLE_TIME)
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+ id->time = jr->load.p.timestamp;
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+
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+ /*
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+ * create pseudo sample to induce dso hit increment
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+ * use first address as sample address
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+ */
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+ memset(&sample, 0, sizeof(sample));
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+ sample.pid = pid;
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+ sample.tid = tid;
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+ sample.time = id->time;
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+ sample.ip = addr;
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+
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+ ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
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+ if (ret)
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+ return ret;
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+
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+ ret = jit_inject_event(jd, event);
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+ /*
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+ * mark dso as use to generate buildid in the header
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+ */
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+ if (!ret)
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+ build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
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+
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+ return ret;
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+}
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+
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+static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr)
|
|
|
+{
|
|
|
+ struct perf_sample sample;
|
|
|
+ union perf_event *event;
|
|
|
+ struct perf_tool *tool = jd->session->tool;
|
|
|
+ char *filename;
|
|
|
+ size_t size;
|
|
|
+ struct stat st;
|
|
|
+ u16 idr_size;
|
|
|
+ int ret;
|
|
|
+ pid_t pid, tid;
|
|
|
+ struct {
|
|
|
+ u32 pid, tid;
|
|
|
+ u64 time;
|
|
|
+ } *id;
|
|
|
+
|
|
|
+ pid = jr->move.pid;
|
|
|
+ tid = jr->move.tid;
|
|
|
+ idr_size = jd->machine->id_hdr_size;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * +16 to account for sample_id_all (hack)
|
|
|
+ */
|
|
|
+ event = calloc(1, sizeof(*event) + 16);
|
|
|
+ if (!event)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ filename = event->mmap2.filename;
|
|
|
+ size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%"PRIu64,
|
|
|
+ jd->dir,
|
|
|
+ pid,
|
|
|
+ jr->move.code_index);
|
|
|
+
|
|
|
+ size++; /* for \0 */
|
|
|
+
|
|
|
+ if (stat(filename, &st))
|
|
|
+ memset(&st, 0, sizeof(stat));
|
|
|
+
|
|
|
+ size = PERF_ALIGN(size, sizeof(u64));
|
|
|
+
|
|
|
+ event->mmap2.header.type = PERF_RECORD_MMAP2;
|
|
|
+ event->mmap2.header.misc = PERF_RECORD_MISC_USER;
|
|
|
+ event->mmap2.header.size = (sizeof(event->mmap2) -
|
|
|
+ (sizeof(event->mmap2.filename) - size) + idr_size);
|
|
|
+ event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET;
|
|
|
+ event->mmap2.start = jr->move.new_code_addr;
|
|
|
+ event->mmap2.len = jr->move.code_size;
|
|
|
+ event->mmap2.pid = pid;
|
|
|
+ event->mmap2.tid = tid;
|
|
|
+ event->mmap2.ino = st.st_ino;
|
|
|
+ event->mmap2.maj = major(st.st_dev);
|
|
|
+ event->mmap2.min = minor(st.st_dev);
|
|
|
+ event->mmap2.prot = st.st_mode;
|
|
|
+ event->mmap2.flags = MAP_SHARED;
|
|
|
+ event->mmap2.ino_generation = 1;
|
|
|
+
|
|
|
+ id = (void *)((unsigned long)event + event->mmap.header.size - idr_size);
|
|
|
+ if (jd->sample_type & PERF_SAMPLE_TID) {
|
|
|
+ id->pid = pid;
|
|
|
+ id->tid = tid;
|
|
|
+ }
|
|
|
+ if (jd->sample_type & PERF_SAMPLE_TIME)
|
|
|
+ id->time = jr->load.p.timestamp;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * create pseudo sample to induce dso hit increment
|
|
|
+ * use first address as sample address
|
|
|
+ */
|
|
|
+ memset(&sample, 0, sizeof(sample));
|
|
|
+ sample.pid = pid;
|
|
|
+ sample.tid = tid;
|
|
|
+ sample.time = id->time;
|
|
|
+ sample.ip = jr->move.new_code_addr;
|
|
|
+
|
|
|
+ ret = perf_event__process_mmap2(tool, event, &sample, jd->machine);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ ret = jit_inject_event(jd, event);
|
|
|
+ if (!ret)
|
|
|
+ build_id__mark_dso_hit(tool, event, &sample, NULL, jd->machine);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr)
|
|
|
+{
|
|
|
+ void *data;
|
|
|
+ size_t sz;
|
|
|
+
|
|
|
+ if (!(jd && jr))
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ sz = jr->prefix.total_size - sizeof(jr->info);
|
|
|
+ data = malloc(sz);
|
|
|
+ if (!data)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ memcpy(data, &jr->info.entries, sz);
|
|
|
+
|
|
|
+ jd->debug_data = data;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * we must use nr_entry instead of size here because
|
|
|
+ * we cannot distinguish actual entry from padding otherwise
|
|
|
+ */
|
|
|
+ jd->nr_debug_entries = jr->info.nr_entry;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+jit_process_dump(struct jit_buf_desc *jd)
|
|
|
+{
|
|
|
+ union jr_entry *jr;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ while ((jr = jit_get_next_entry(jd))) {
|
|
|
+ switch(jr->prefix.id) {
|
|
|
+ case JIT_CODE_LOAD:
|
|
|
+ ret = jit_repipe_code_load(jd, jr);
|
|
|
+ break;
|
|
|
+ case JIT_CODE_MOVE:
|
|
|
+ ret = jit_repipe_code_move(jd, jr);
|
|
|
+ break;
|
|
|
+ case JIT_CODE_DEBUG_INFO:
|
|
|
+ ret = jit_repipe_debug_info(jd, jr);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ ret = 0;
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+jit_inject(struct jit_buf_desc *jd, char *path)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (verbose > 0)
|
|
|
+ fprintf(stderr, "injecting: %s\n", path);
|
|
|
+
|
|
|
+ ret = jit_open(jd, path);
|
|
|
+ if (ret)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ ret = jit_process_dump(jd);
|
|
|
+
|
|
|
+ jit_close(jd);
|
|
|
+
|
|
|
+ if (verbose > 0)
|
|
|
+ fprintf(stderr, "injected: %s (%d)\n", path, ret);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * File must be with pattern .../jit-XXXX.dump
|
|
|
+ * where XXXX is the PID of the process which did the mmap()
|
|
|
+ * as captured in the RECORD_MMAP record
|
|
|
+ */
|
|
|
+static int
|
|
|
+jit_detect(char *mmap_name, pid_t pid)
|
|
|
+ {
|
|
|
+ char *p;
|
|
|
+ char *end = NULL;
|
|
|
+ pid_t pid2;
|
|
|
+
|
|
|
+ if (verbose > 2)
|
|
|
+ fprintf(stderr, "jit marker trying : %s\n", mmap_name);
|
|
|
+ /*
|
|
|
+ * get file name
|
|
|
+ */
|
|
|
+ p = strrchr(mmap_name, '/');
|
|
|
+ if (!p)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * match prefix
|
|
|
+ */
|
|
|
+ if (strncmp(p, "/jit-", 5))
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * skip prefix
|
|
|
+ */
|
|
|
+ p += 5;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * must be followed by a pid
|
|
|
+ */
|
|
|
+ if (!isdigit(*p))
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ pid2 = (int)strtol(p, &end, 10);
|
|
|
+ if (!end)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * pid does not match mmap pid
|
|
|
+ * pid==0 in system-wide mode (synthesized)
|
|
|
+ */
|
|
|
+ if (pid && pid2 != pid)
|
|
|
+ return -1;
|
|
|
+ /*
|
|
|
+ * validate suffix
|
|
|
+ */
|
|
|
+ if (strcmp(end, ".dump"))
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ if (verbose > 0)
|
|
|
+ fprintf(stderr, "jit marker found: %s\n", mmap_name);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+jit_process(struct perf_session *session,
|
|
|
+ struct perf_data_file *output,
|
|
|
+ struct machine *machine,
|
|
|
+ char *filename,
|
|
|
+ pid_t pid,
|
|
|
+ u64 *nbytes)
|
|
|
+{
|
|
|
+ struct perf_evsel *first;
|
|
|
+ struct jit_buf_desc jd;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * first, detect marker mmap (i.e., the jitdump mmap)
|
|
|
+ */
|
|
|
+ if (jit_detect(filename, pid))
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ memset(&jd, 0, sizeof(jd));
|
|
|
+
|
|
|
+ jd.session = session;
|
|
|
+ jd.output = output;
|
|
|
+ jd.machine = machine;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * track sample_type to compute id_all layout
|
|
|
+ * perf sets the same sample type to all events as of now
|
|
|
+ */
|
|
|
+ first = perf_evlist__first(session->evlist);
|
|
|
+ jd.sample_type = first->attr.sample_type;
|
|
|
+
|
|
|
+ *nbytes = 0;
|
|
|
+
|
|
|
+ ret = jit_inject(&jd, filename);
|
|
|
+ if (!ret)
|
|
|
+ *nbytes = jd.bytes_written;
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
Stephane Eranian