commit 339976c4dfecfb6e268fe2245a2763f7025e4f2b
author bernhardu <bernhardu@mailbox.org> Mon Jun 02 08:59:43 2025 +0200
committer Copybara-Service <copybara-worker@google.com> Mon Jun 02 00:01:36 2025 -0700
tree 49dd16fdfafe645a923d0bbd36a3a4df0f9b0243
parent b0dd94002ebdf608c5c77ca3f95f27c52ffb9806

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

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;`

https://gitlab.winehq.org/wine/wine/-/blob/290fd532ee7376442d272e3833528256bfe5e9dc/dlls/msvcrt/string.c#L3200

GitOrigin-RevId: 32973408bcb28acac897f4e43cb8f64a4b64529e

lib/interception/interception_win.cpp

diff --git a/lib/interception/interception_win.cpp b/lib/interception/interception_win.cpp
index c9a7718..246a22c 100644
--- a/lib/interception/interception_win.cpp
+++ b/lib/interception/interception_win.cpp
@@ -754,6 +754,12 @@
     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) {

lib/interception/tests/interception_win_test.cpp

diff --git a/lib/interception/tests/interception_win_test.cpp b/lib/interception/tests/interception_win_test.cpp
index 893f346..f11c1d1 100644
--- a/lib/interception/tests/interception_win_test.cpp
+++ b/lib/interception/tests/interception_win_test.cpp
@@ -1043,6 +1043,8 @@
     { 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]"},