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-rw-r--r--tests/test-i386.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/tests/test-i386.c b/tests/test-i386.c
index 3e10a9931e..27a899830f 100644
--- a/tests/test-i386.c
+++ b/tests/test-i386.c
@@ -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;