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precise self modifying code test 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@742 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-04-25 17:54:32 +00:00
parent bfbc9133eb
commit 1190935d98
1 changed files with 23 additions and 1 deletions
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24
tests/test-i386.c
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@ -1580,8 +1580,23 @@ uint8_t code[] = {
0xc3, /* ret */
};
typedef int FuncType(void);
asm("smc_code2:\n"
"movl 4(%esp), %eax\n"
"movl %eax, smc_patch_addr2 + 1\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"smc_patch_addr2:\n"
"movl $1, %eax\n"
"ret\n");
typedef int FuncType(void);
extern int smc_code2(int);
void test_self_modifying_code(void)
{
int i;
@ -1592,6 +1607,13 @@ void test_self_modifying_code(void)
code[1] = i;
printf("func%d = 0x%x\n", i, ((FuncType *)code)());
}
/* more difficult test : the modified code is just after the
modifying instruction. It is forbidden in Intel specs, but it
is used by old DOS programs */
for(i = 2; i <= 4; i++) {
printf("smc_code2(%d) = %d\n", i, smc_code2(i));
}
}
static void *call_end __init_call = NULL;