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[win/asan] GetInstructionSize: Support 48 bX movabsq instructions. (#141625)

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Created for Wine's memset by clang or mingw-gcc,
the latter places it quite at the start of the function:

```
   0x00006ffffb67e210 <memset+0>:       0f b6 d2                movzbl %dl,%edx
   0x00006ffffb67e213 <memset+3>:       48 b8 01 01 01 01 01 01 01 01   movabs $0x101010101010101,%rax
```

`3200      uint64_t v = 0x101010101010101ull * (unsigned char)c;`


290fd532ee/dlls/msvcrt/string.c (L3200)
This commit is contained in:
bernhardu
2025-06-02 08:59:43 +02:00
committed by GitHub
parent e49738b3ac
commit 32973408bc
2 changed files with 8 additions and 0 deletions
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6
compiler-rt/lib/interception/interception_win.cpp
View File

@@ -754,6 +754,12 @@ static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
case 0x7B81: // 81 7B YY XX XX XX XX cmp DWORD PTR [rbx+YY], XX XX XX XX
case 0x7981: // 81 79 YY XX XX XX XX cmp dword ptr [rcx+YY], XX XX XX XX
return 7;
case 0xb848: // 48 b8 XX XX XX XX XX XX XX XX :
// movabsq XX XX XX XX XX XX XX XX, rax
case 0xba48: // 48 ba XX XX XX XX XX XX XX XX :
// movabsq XX XX XX XX XX XX XX XX, rdx
return 10;
}
switch (0x00FFFFFF & *(u32 *)address) {

2
compiler-rt/lib/interception/tests/interception_win_test.cpp
View File

@@ -1043,6 +1043,8 @@ const struct InstructionSizeData {
{ 8, {0xc7, 0x44, 0x24, 0x73, 0x74, 0x75, 0x76, 0x77}, 0, "C7 44 24 XX YY YY YY YY : mov dword ptr [rsp + XX], YYYYYYYY"},
{ 9, {0x41, 0x81, 0x7c, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78}, 0, "41 81 7c ZZ YY XX XX XX XX : cmp DWORD PTR [reg+reg*n+YY], XX XX XX XX"},
{ 9, {0xA1, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78}, 0, "A1 XX XX XX XX XX XX XX XX : movabs eax, dword ptr ds:[XXXXXXXX]"},
{10, {0x48, 0xb8, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79}, 0, "48 b8 XX XX XX XX XX XX XX XX : movabsq XX XX XX XX XX XX XX XX, rax"},
{10, {0x48, 0xba, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79}, 0, "48 ba XX XX XX XX XX XX XX XX : movabsq XX XX XX XX XX XX XX XX, rdx"},
#else
// sorted list
{ 3, {0x8B, 0x45, 0x72}, 0, "8B 45 XX : mov eax, dword ptr [ebp + XX]"},