crashpad/util/win/safe_terminate_process.asm
Mark Mentovai 6278690abe Update copyright boilerplate, 2022 edition (Crashpad)
sed -i '' -E -e 's/Copyright (.+) The Crashpad Authors\. All rights reserved\.$/Copyright \1 The Crashpad Authors/' $(git grep -El 'Copyright (.+) The Crashpad Authors\. All rights reserved\.$')

Bug: chromium:1098010
Change-Id: I8d6138469ddbe3d281a5d83f64cf918ec2491611
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3878262
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
2022-09-06 23:54:07 +00:00

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; Copyright 2017 The Crashpad Authors
;
; Licensed under the Apache License, Version 2.0 (the "License");
; you may not use this file except in compliance with the License.
; You may obtain a copy of the License at
;
; http://www.apache.org/licenses/LICENSE-2.0
;
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
; See the License for the specific language governing permissions and
; limitations under the License.
; Detect ml64 assembling for x86_64 by checking for rax.
ifdef rax
_M_X64 equ 1
else
_M_IX86 equ 1
endif
ifdef _M_IX86
.586
.xmm
.model flat
includelib kernel32.lib
extern __imp__TerminateProcess@8:proc
; namespace crashpad {
; bool SafeTerminateProcess(HANDLE process, UINT exit_code);
; } // namespace crashpad
SAFETERMINATEPROCESS_SYMBOL equ ?SafeTerminateProcess@crashpad@@YA_NPAXI@Z
_TEXT segment
public SAFETERMINATEPROCESS_SYMBOL
SAFETERMINATEPROCESS_SYMBOL proc
; This function is written in assembler source because its important for it
; to not be inlined, for it to allocate a stack frame, and most critically,
; for it to not trust esp on return from TerminateProcess().
; __declspec(noinline) can prevent inlining and #pragma optimize("y", off) can
; disable frame pointer omission, but theres no way to force a C compiler to
; distrust esp, and even if there was a way, itd probably be fragile.
push ebp
mov ebp, esp
push [ebp+12]
push [ebp+8]
call dword ptr [__imp__TerminateProcess@8]
; Convert from BOOL to bool.
test eax, eax
setne al
; TerminateProcess() is supposed to be stdcall (callee clean-up), and esp and
; ebp are expected to already be equal. But if its been patched badly by
; something thats cdecl (caller clean-up), this next move will get things
; back on track.
mov esp, ebp
pop ebp
ret
SAFETERMINATEPROCESS_SYMBOL endp
_TEXT ends
endif
end