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ntdll/tests: Avoid misaligned load in exception handler code in run_exception_test_flags().

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This is required for testing EH behavior on alignment check (#AC)
exceptions.
This commit is contained in:
Jinoh Kang 2024-01-06 22:36:09 +09:00 • committed by Alexandre Julliard
parent 702aeb3acb
commit b07ce09982
1 changed files with 8 additions and 6 deletions
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14
dlls/ntdll/tests/exception.c
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@ -3200,7 +3200,7 @@ static void run_exception_test_flags(void *handler, const void* context,
const void *code, unsigned int code_size, const void *code, unsigned int code_size,
DWORD access, DWORD handler_flags) DWORD access, DWORD handler_flags)
{ {
unsigned char buf[8 + 6 + 8 + 8]; unsigned char buf[2 + 8 + 2 + 8 + 8];
RUNTIME_FUNCTION runtime_func; RUNTIME_FUNCTION runtime_func;
UNWIND_INFO *unwind = (UNWIND_INFO *)buf; UNWIND_INFO *unwind = (UNWIND_INFO *)buf;
void (*func)(void) = code_mem; void (*func)(void) = code_mem;
@ -3219,11 +3219,13 @@ static void run_exception_test_flags(void *handler, const void* context,
*(ULONG *)&buf[4] = 0x1010; *(ULONG *)&buf[4] = 0x1010;
*(const void **)&buf[8] = context; *(const void **)&buf[8] = context;
/* jmp near */ /* movabs $<handler>, %rax */
buf[16] = 0xff; buf[16] = 0x48;
buf[17] = 0x25; buf[17] = 0xb8;
*(ULONG *)&buf[18] = 0; *(void **)&buf[18] = handler;
*(void **)&buf[22] = handler; /* jmp *%rax */
buf[26] = 0xff;
buf[27] = 0xe0;
memcpy((unsigned char *)code_mem + 0x1000, buf, sizeof(buf)); memcpy((unsigned char *)code_mem + 0x1000, buf, sizeof(buf));
memcpy(code_mem, code, code_size); memcpy(code_mem, code, code_size);