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Support OpenBSD's native frame protection conventions.

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OpenBSD's stack smashing protection differs slightly from other
platforms:

  1. The smash handler function is "__stack_smash_handler(const char
     *funcname)" instead of "__stack_chk_fail(void)".

  2. There's a hidden "long __guard_local" object that gets linked
     into each executable and DSO.

Patch by Matthew Dempsky.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183533 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-06-07 16:35:57 +00:00
parent 47b0c0a9a0
commit 62ed8d3e35
2 changed files with 41 additions and 11 deletions
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5
test/CodeGen/X86/stack-protector.ll
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@@ -2,6 +2,7 @@
; RUN: llc -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck --check-prefix=LINUX-X64 %s
; RUN: llc -code-model=kernel -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck --check-prefix=LINUX-KERNEL-X64 %s
; RUN: llc -mtriple=x86_64-apple-darwin < %s -o - | FileCheck --check-prefix=DARWIN-X64 %s
; RUN: llc -mtriple=amd64-pc-openbsd < %s -o - | FileCheck --check-prefix=OPENBSD-AMD64 %s
%struct.foo = type { [16 x i8] }
%struct.foo.0 = type { [4 x i8] }
@@ -69,6 +70,10 @@ entry:
; DARWIN-X64: test1b:
; DARWIN-X64: mov{{l|q}} ___stack_chk_guard
; DARWIN-X64: callq ___stack_chk_fail
; OPENBSD-AMD64: test1b:
; OPENBSD-AMD64: movq __guard_local(%rip)
; OPENBSD-AMD64: callq __stack_smash_handler
%a.addr = alloca i8*, align 8
%buf = alloca [16 x i8], align 16
store i8* %a, i8** %a.addr, align 8