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| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2015-09-23 01:03:51 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2015-09-23 01:03:51 +0000 |
| commit | ce2e16f00c5f544879e8ac1e149b5fb268241817 (patch) | |
| tree | a8fba6bbe7813194c0c3893a18a46b26942c7fcd /llvm/test/Transforms/SafeStack | |
| parent | b54a72ef78f3236a6c831687d505cdb725cb51ff (diff) | |
| download | bcm5719-llvm-ce2e16f00c5f544879e8ac1e149b5fb268241817.tar.gz bcm5719-llvm-ce2e16f00c5f544879e8ac1e149b5fb268241817.zip | |
Android support for SafeStack.
Add two new ways of accessing the unsafe stack pointer:
* At a fixed offset from the thread TLS base. This is very similar to
StackProtector cookies, but we plan to extend it to other backends
(ARM in particular) soon. Bionic-side implementation here:
https://android-review.googlesource.com/170988.
* Via a function call, as a fallback for platforms that provide
neither a fixed TLS slot, nor a reasonable TLS implementation (i.e.
not emutls).
llvm-svn: 248357
Diffstat (limited to 'llvm/test/Transforms/SafeStack')
| -rw-r--r-- | llvm/test/Transforms/SafeStack/abi.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/llvm/test/Transforms/SafeStack/abi.ll b/llvm/test/Transforms/SafeStack/abi.ll new file mode 100644 index 00000000000..c8d0553e527 --- /dev/null +++ b/llvm/test/Transforms/SafeStack/abi.ll @@ -0,0 +1,38 @@ +; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s --check-prefix=TLS +; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s --check-prefix=TLS +; RUN: opt -safe-stack -S -mtriple=i686-linux-android < %s -o - | FileCheck %s --check-prefix=DIRECT-TLS32 +; RUN: opt -safe-stack -S -mtriple=x86_64-linux-android < %s -o - | FileCheck %s --check-prefix=DIRECT-TLS64 +; RUN: opt -safe-stack -S -mtriple=arm-linux-android < %s -o - | FileCheck %s --check-prefix=CALL +; RUN: opt -safe-stack -S -mtriple=aarch64-linux-android < %s -o - | FileCheck %s --check-prefix=CALL + + +define void @foo() nounwind uwtable safestack { +entry: +; TLS: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr +; TLS: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16 +; TLS: store i8* %[[USST]], i8** @__safestack_unsafe_stack_ptr + +; DIRECT-TLS32: %[[USP:.*]] = load i8*, i8* addrspace(36)* inttoptr (i32 256 to i8* addrspace(36)*) +; DIRECT-TLS32: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16 +; DIRECT-TLS32: store i8* %[[USST]], i8* addrspace(36)* inttoptr (i32 256 to i8* addrspace(36)*) + +; DIRECT-TLS64: %[[USP:.*]] = load i8*, i8* addrspace(72)* inttoptr (i32 257 to i8* addrspace(72)*) +; DIRECT-TLS64: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16 +; DIRECT-TLS64: store i8* %[[USST]], i8* addrspace(72)* inttoptr (i32 257 to i8* addrspace(72)*) + +; CALL: %[[SPA:.*]] = call i8** @__safestack_pointer_address() +; CALL: %[[USP:.*]] = load i8*, i8** %[[SPA]] +; CALL: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16 +; CALL: store i8* %[[USST]], i8** %[[SPA]] + + %a = alloca i8, align 8 + call void @Capture(i8* %a) + +; TLS: store i8* %[[USP]], i8** @__safestack_unsafe_stack_ptr +; DIRECT-TLS32: store i8* %[[USP]], i8* addrspace(36)* inttoptr (i32 256 to i8* addrspace(36)*) +; DIRECT-TLS64: store i8* %[[USP]], i8* addrspace(72)* inttoptr (i32 257 to i8* addrspace(72)*) +; CALL: store i8* %[[USP]], i8** %[[SPA]] + ret void +} + +declare void @Capture(i8*) |
