tools/perf/tests/genelf.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <limits.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7 #include <linux/compiler.h>
   8
   9 #include "debug.h"
  10 #include "tests.h"
  11
  12 #ifdef HAVE_JITDUMP
  13 #include <libelf.h>
  14 #include "../util/genelf.h"
  15 #endif
  16
  17 #define TEMPL "/tmp/perf-test-XXXXXX"
  18
  19 int test__jit_write_elf(struct test *test __maybe_unused,
  20                         int subtest __maybe_unused)
  21 {
  22 #ifdef HAVE_JITDUMP
  23         static unsigned char x86_code[] = {
  24                 0xBB, 0x2A, 0x00, 0x00, 0x00, /* movl $42, %ebx */
  25                 0xB8, 0x01, 0x00, 0x00, 0x00, /* movl $1, %eax */
  26                 0xCD, 0x80            /* int $0x80 */
  27         };
  28         char path[PATH_MAX];
  29         int fd, ret;
  30
  31         strcpy(path, TEMPL);
  32
  33         fd = mkstemp(path);
  34         if (fd < 0) {
  35                 perror("mkstemp failed");
  36                 return TEST_FAIL;
  37         }
  38
  39         pr_info("Writing jit code to: %s\n", path);
  40
  41         ret = jit_write_elf(fd, 0, "main", x86_code, sizeof(x86_code),
  42                         NULL, 0, NULL, 0, 0);
  43         close(fd);
  44
  45         unlink(path);
  46
  47         return ret ? TEST_FAIL : 0;
  48 #else
  49         return TEST_SKIP;
  50 #endif
  51 }