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| author | Youfu Zhang <zhangyoufu@gmail.com> | 2021-02-23 03:52:43 +0000 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2021-03-20 17:08:03 +0000 |
| commit | e0fae78e1deeaae5bc3c6a8426ece37c62445bf4 (patch) | |
| tree | 466dba0a2c801df33f6573e800d968d284e5f3a2 /src/runtime/rt0_windows_amd64.s | |
| parent | 6ae3b70ef255cd7317764a12b7230f293683f2c5 (diff) | |
| download | go-e0fae78e1deeaae5bc3c6a8426ece37c62445bf4.tar.xz | |
runtime: fix stack alignment for Windows amd64 lib entry
Windows amd64 calling convention requires 16-bytes aligned
stack pointer. Before this patch, the real frame size is
0x48 (frame size) + 0x10 (frame pointer & return address),
which does not satisfy the alignment requirement.
_cgo_sys_thread_create eventually calls NtCreateThread,
which receives a pointer to a ThreadContext structure
allocated from (mis-aligned) stack, and may fail with
STATUS_DATATYPE_MISALIGNMENT on some implementations.
BP is saved/restored by prolog/epilog.
AX, CX, DX are volatile, no need to save and restore.
Fixes #41075
Change-Id: I01c0a22b4bf3b4cfdebf4df587445aa46c667973
GitHub-Last-Rev: 15d2bd740e3e61c9753b3e1b574fdb5da538459c
GitHub-Pull-Request: golang/go#44524
Reviewed-on: https://go-review.googlesource.com/c/go/+/295329
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Christopher Nelson <nadiasvertex@gmail.com>
Diffstat (limited to 'src/runtime/rt0_windows_amd64.s')
| -rw-r--r-- | src/runtime/rt0_windows_amd64.s | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/src/runtime/rt0_windows_amd64.s b/src/runtime/rt0_windows_amd64.s index 345e141802..e60bf4c86d 100644 --- a/src/runtime/rt0_windows_amd64.s +++ b/src/runtime/rt0_windows_amd64.s @@ -16,24 +16,12 @@ TEXT _rt0_amd64_windows(SB),NOSPLIT,$-8 // phase. // Leave space for four pointers on the stack as required // by the Windows amd64 calling convention. -TEXT _rt0_amd64_windows_lib(SB),NOSPLIT,$0x48 - MOVQ BP, 0x20(SP) - MOVQ BX, 0x28(SP) - MOVQ AX, 0x30(SP) - MOVQ CX, 0x38(SP) - MOVQ DX, 0x40(SP) - +TEXT _rt0_amd64_windows_lib(SB),NOSPLIT,$0x20 // Create a new thread to do the runtime initialization and return. MOVQ _cgo_sys_thread_create(SB), AX MOVQ $_rt0_amd64_windows_lib_go(SB), CX MOVQ $0, DX CALL AX - - MOVQ 0x20(SP), BP - MOVQ 0x28(SP), BX - MOVQ 0x30(SP), AX - MOVQ 0x38(SP), CX - MOVQ 0x40(SP), DX RET TEXT _rt0_amd64_windows_lib_go(SB),NOSPLIT,$0 |