LXR linux/arch/x86/mm/kmemcheck/selftest.c

   1#include <linux/kernel.h>
   2
   3#include "opcode.h"
   4#include "selftest.h"
   5
   6struct selftest_opcode {
   7        unsigned int expected_size;
   8        const uint8_t *insn;
   9        const char *desc;
  10};
  11
  12static const struct selftest_opcode selftest_opcodes[] = {
  13        /* REP MOVS */
  14        {1, "\xf3\xa4",                 "rep movsb <mem8>, <mem8>"},
  15        {4, "\xf3\xa5",                 "rep movsl <mem32>, <mem32>"},
  16
  17        /* MOVZX / MOVZXD */
  18        {1, "\x66\x0f\xb6\x51\xf8",     "movzwq <mem8>, <reg16>"},
  19        {1, "\x0f\xb6\x51\xf8",         "movzwq <mem8>, <reg32>"},
  20
  21        /* MOVSX / MOVSXD */
  22        {1, "\x66\x0f\xbe\x51\xf8",     "movswq <mem8>, <reg16>"},
  23        {1, "\x0f\xbe\x51\xf8",         "movswq <mem8>, <reg32>"},
  24
  25#ifdef CONFIG_X86_64
  26        /* MOVZX / MOVZXD */
  27        {1, "\x49\x0f\xb6\x51\xf8",     "movzbq <mem8>, <reg64>"},
  28        {2, "\x49\x0f\xb7\x51\xf8",     "movzbq <mem16>, <reg64>"},
  29
  30        /* MOVSX / MOVSXD */
  31        {1, "\x49\x0f\xbe\x51\xf8",     "movsbq <mem8>, <reg64>"},
  32        {2, "\x49\x0f\xbf\x51\xf8",     "movsbq <mem16>, <reg64>"},
  33        {4, "\x49\x63\x51\xf8",         "movslq <mem32>, <reg64>"},
  34#endif
  35};
  36
  37static bool selftest_opcode_one(const struct selftest_opcode *op)
  38{
  39        unsigned size;
  40
  41        kmemcheck_opcode_decode(op->insn, &size);
  42
  43        if (size == op->expected_size)
  44                return true;
  45
  46        printk(KERN_WARNING "kmemcheck: opcode %s: expected size %d, got %d\n",
  47                op->desc, op->expected_size, size);
  48        return false;
  49}
  50
  51static bool selftest_opcodes_all(void)
  52{
  53        bool pass = true;
  54        unsigned int i;
  55
  56        for (i = 0; i < ARRAY_SIZE(selftest_opcodes); ++i)
  57                pass = pass && selftest_opcode_one(&selftest_opcodes[i]);
  58
  59        return pass;
  60}
  61
  62bool kmemcheck_selftest(void)
  63{
  64        bool pass = true;
  65
  66        pass = pass && selftest_opcodes_all();
  67
  68        return pass;
  69}
  70