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| author | Saleem Abdulrasool <compnerd@compnerd.org> | 2014-04-30 07:05:07 +0000 |
|---|---|---|
| committer | Saleem Abdulrasool <compnerd@compnerd.org> | 2014-04-30 07:05:07 +0000 |
| commit | ddbde80aae45be5c461efd4fa850536d185c95b8 (patch) | |
| tree | 25e1ce9b6bd6b3a5d2c11f9daa2cb11df6ad6037 /test | |
| parent | 38dbc8460217c5a5e89b09d901a0a006c9c99385 (diff) | |
| download | llvm-ddbde80aae45be5c461efd4fa850536d185c95b8.tar.gz llvm-ddbde80aae45be5c461efd4fa850536d185c95b8.tar.bz2 llvm-ddbde80aae45be5c461efd4fa850536d185c95b8.tar.xz | |
ARM: support stack probe emission for Windows on ARM
This introduces the stack lowering emission of the stack probe function for
Windows on ARM. The stack on Windows on ARM is a dynamically paged stack where
any page allocation which crosses a page boundary of the following guard page
will cause a page fault. This page fault must be handled by the kernel to
ensure that the page is faulted in. If this does not occur and a write access
any memory beyond that, the page fault will go unserviced, resulting in an
abnormal program termination.
The watermark for the stack probe appears to be at 4080 bytes (for
accommodating the stack guard canaries and stack alignment) when SSP is
enabled. Otherwise, the stack probe is emitted on the page size boundary of
4096 bytes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207615 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/ARM/Windows/chkstk.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/Windows/chkstk.ll b/test/CodeGen/ARM/Windows/chkstk.ll new file mode 100644 index 0000000000..9c58fa08d3 --- /dev/null +++ b/test/CodeGen/ARM/Windows/chkstk.ll @@ -0,0 +1,24 @@ +; RUN: llc -mtriple=thumbv7-windows -mcpu=cortex-a9 %s -o - \ +; RUN: | FileCheck -check-prefix CHECK-DEFAULT-CODE-MODEL %s + +; RUN: llc -mtriple=thumbv7-windows -mcpu=cortex-a9 -code-model=large %s -o - \ +; RUN: | FileCheck -check-prefix CHECK-LARGE-CODE-MODEL %s + +define arm_aapcs_vfpcc void @check_watermark() { +entry: + %buffer = alloca [4096 x i8], align 1 + ret void +} + +; CHECK-DEFAULT-CODE-MODEL: check_watermark: +; CHECK-DEFAULT-CODE-MODEL: movw r4, #1024 +; CHECK-DEFAULT-CODE-MODEL: bl __chkstk +; CHECK-DEFAULT-CODE-MODEL: sub.w sp, sp, r4 + +; CHECK-LARGE-CODE-MODEL: check_watermark: +; CHECK-LARGE-CODE-MODEL: movw r4, #1024 +; CHECK-LARGE-CODE-MODEL: movw r12, :lower16:__chkstk +; CHECK-LARGE-CODE-MODEL: movt r12, :upper16:__chkstk +; CHECK-LARGE-CODE-MODEL: blx r12 +; CHECK-LARGE-CODE-MODEL: sub.w sp, sp, r4 + |