Commit 1190935d98ec8a8e2e2438858bee8bd5e49ee324
1 parent
bfbc9133
precise self modifying code test
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@742 c046a42c-6fe2-441c-8c8c-71466251a162
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tests/test-i386.c
| @@ -1580,8 +1580,23 @@ uint8_t code[] = { | @@ -1580,8 +1580,23 @@ uint8_t code[] = { | ||
| 1580 | 0xc3, /* ret */ | 1580 | 0xc3, /* ret */ |
| 1581 | }; | 1581 | }; |
| 1582 | 1582 | ||
| 1583 | -typedef int FuncType(void); | 1583 | +asm("smc_code2:\n" |
| 1584 | + "movl 4(%esp), %eax\n" | ||
| 1585 | + "movl %eax, smc_patch_addr2 + 1\n" | ||
| 1586 | + "nop\n" | ||
| 1587 | + "nop\n" | ||
| 1588 | + "nop\n" | ||
| 1589 | + "nop\n" | ||
| 1590 | + "nop\n" | ||
| 1591 | + "nop\n" | ||
| 1592 | + "nop\n" | ||
| 1593 | + "nop\n" | ||
| 1594 | + "smc_patch_addr2:\n" | ||
| 1595 | + "movl $1, %eax\n" | ||
| 1596 | + "ret\n"); | ||
| 1584 | 1597 | ||
| 1598 | +typedef int FuncType(void); | ||
| 1599 | +extern int smc_code2(int); | ||
| 1585 | void test_self_modifying_code(void) | 1600 | void test_self_modifying_code(void) |
| 1586 | { | 1601 | { |
| 1587 | int i; | 1602 | int i; |
| @@ -1592,6 +1607,13 @@ void test_self_modifying_code(void) | @@ -1592,6 +1607,13 @@ void test_self_modifying_code(void) | ||
| 1592 | code[1] = i; | 1607 | code[1] = i; |
| 1593 | printf("func%d = 0x%x\n", i, ((FuncType *)code)()); | 1608 | printf("func%d = 0x%x\n", i, ((FuncType *)code)()); |
| 1594 | } | 1609 | } |
| 1610 | + | ||
| 1611 | + /* more difficult test : the modified code is just after the | ||
| 1612 | + modifying instruction. It is forbidden in Intel specs, but it | ||
| 1613 | + is used by old DOS programs */ | ||
| 1614 | + for(i = 2; i <= 4; i++) { | ||
| 1615 | + printf("smc_code2(%d) = %d\n", i, smc_code2(i)); | ||
| 1616 | + } | ||
| 1595 | } | 1617 | } |
| 1596 | 1618 | ||
| 1597 | static void *call_end __init_call = NULL; | 1619 | static void *call_end __init_call = NULL; |