linux_kernel/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-vsx.c

/*
 * Ptrace test for VMX/VSX registers in the TM Suspend context
 *
 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
 *
 * 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 "ptrace.h"
#include "tm.h"
#include "ptrace-vsx.h"

int shm_id;
int *cptr, *pptr;

unsigned long fp_load[VEC_MAX];
unsigned long fp_load_new[VEC_MAX];
unsigned long fp_store[VEC_MAX];
unsigned long fp_load_ckpt[VEC_MAX];
unsigned long fp_load_ckpt_new[VEC_MAX];

__attribute__((used)) void load_vsx(void)
{
	loadvsx(fp_load, 0);
}

__attribute__((used)) void load_vsx_new(void)
{
	loadvsx(fp_load_new, 0);
}

__attribute__((used)) void load_vsx_ckpt(void)
{
	loadvsx(fp_load_ckpt, 0);
}

__attribute__((used)) void wait_parent(void)
{
	cptr[2] = 1;
	while (!cptr[1])
		asm volatile("" : : : "memory");
}

void tm_spd_vsx(void)
{
	unsigned long result, texasr;
	int ret;

	cptr = (int *)shmat(shm_id, NULL, 0);

trans:
	cptr[2] = 0;
	asm __volatile__(
		"bl load_vsx_ckpt;"

		"1: ;"
		"tbegin.;"
		"beq 2f;"

		"bl load_vsx_new;"
		"tsuspend.;"
		"bl load_vsx;"
		"bl wait_parent;"
		"tresume.;"

		"tend.;"
		"li 0, 0;"
		"ori %[res], 0, 0;"
		"b 3f;"

		"2: ;"
		"li 0, 1;"
		"ori %[res], 0, 0;"
		"mfspr %[texasr], %[sprn_texasr];"

		"3: ;"
		: [res] "=r" (result), [texasr] "=r" (texasr)
		: [fp_load] "r" (fp_load), [fp_load_ckpt] "r" (fp_load_ckpt),
		[sprn_texasr] "i"  (SPRN_TEXASR)
		: "memory", "r0", "r1", "r2", "r3", "r4",
		"r8", "r9", "r10", "r11"
		);

	if (result) {
		if (!cptr[0])
			goto trans;
		shmdt((void *)cptr);

		storevsx(fp_store, 0);
		ret = compare_vsx_vmx(fp_store, fp_load_ckpt_new);
		if (ret)
			exit(1);
		exit(0);
	}
	shmdt((void *)cptr);
	exit(1);
}

int trace_tm_spd_vsx(pid_t child)
{
	unsigned long vsx[VSX_MAX];
	unsigned long vmx[VMX_MAX + 2][2];

	FAIL_IF(start_trace(child));
	FAIL_IF(show_vsx(child, vsx));
	FAIL_IF(validate_vsx(vsx, fp_load));
	FAIL_IF(show_vmx(child, vmx));
	FAIL_IF(validate_vmx(vmx, fp_load));
	FAIL_IF(show_vsx_ckpt(child, vsx));
	FAIL_IF(validate_vsx(vsx, fp_load_ckpt));
	FAIL_IF(show_vmx_ckpt(child, vmx));
	FAIL_IF(validate_vmx(vmx, fp_load_ckpt));

	memset(vsx, 0, sizeof(vsx));
	memset(vmx, 0, sizeof(vmx));

	load_vsx_vmx(fp_load_ckpt_new, vsx, vmx);

	FAIL_IF(write_vsx_ckpt(child, vsx));
	FAIL_IF(write_vmx_ckpt(child, vmx));

	pptr[0] = 1;
	pptr[1] = 1;
	FAIL_IF(stop_trace(child));

	return TEST_PASS;
}

int ptrace_tm_spd_vsx(void)
{
	pid_t pid;
	int ret, status, i;

	SKIP_IF(!have_htm());
	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);

	for (i = 0; i < 128; i++) {
		fp_load[i] = 1 + rand();
		fp_load_new[i] = 1 + 2 * rand();
		fp_load_ckpt[i] = 1 + 3 * rand();
		fp_load_ckpt_new[i] = 1 + 4 * rand();
	}

	pid = fork();
	if (pid < 0) {
		perror("fork() failed");
		return TEST_FAIL;
	}

	if (pid == 0)
		tm_spd_vsx();

	if (pid) {
		pptr = (int *)shmat(shm_id, NULL, 0);
		while (!pptr[2])
			asm volatile("" : : : "memory");

		ret = trace_tm_spd_vsx(pid);
		if (ret) {
			kill(pid, SIGKILL);
			shmdt((void *)pptr);
			shmctl(shm_id, IPC_RMID, NULL);
			return TEST_FAIL;
		}

		shmdt((void *)pptr);
		ret = wait(&status);
		shmctl(shm_id, IPC_RMID, NULL);
		if (ret != pid) {
			printf("Child's exit status not captured\n");
			return TEST_FAIL;
		}

		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
			TEST_PASS;
	}
	return TEST_PASS;
}

int main(int argc, char *argv[])
{
	return test_harness(ptrace_tm_spd_vsx, "ptrace_tm_spd_vsx");
}