diff options
| author | Martin Storsjo <martin@martin.st> | 2018-07-17 19:14:47 +0000 |
|---|---|---|
| committer | Martin Storsjo <martin@martin.st> | 2018-07-17 19:14:47 +0000 |
| commit | a22026054ba1a9befadef306c3f56481b4397ab3 (patch) | |
| tree | 75b55f0f2c03a43b73d03859cbdc29cacc902e97 /lib | |
| parent | 823b254fc6354740a99e824b7757c83668496918 (diff) | |
[builtins] Implement the __chkstk function for ARM for MinGW
This function is available for linking in from kernel32.dll, but
it's not allowed to link that function from there in Windows Store
apps.
Differential Revision: https://reviews.llvm.org/D49055
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@337313 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/builtins/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | lib/builtins/arm/chkstk.S | 34 |
2 files changed, 35 insertions, 0 deletions
diff --git a/lib/builtins/CMakeLists.txt b/lib/builtins/CMakeLists.txt index 99184baf5..75ff66405 100644 --- a/lib/builtins/CMakeLists.txt +++ b/lib/builtins/CMakeLists.txt @@ -406,6 +406,7 @@ if(MINGW) arm/aeabi_ldivmod.S arm/aeabi_uidivmod.S arm/aeabi_uldivmod.S + arm/chkstk.S divmoddi4.c divmodsi4.c divdi3.c diff --git a/lib/builtins/arm/chkstk.S b/lib/builtins/arm/chkstk.S new file mode 100644 index 000000000..e30021058 --- /dev/null +++ b/lib/builtins/arm/chkstk.S @@ -0,0 +1,34 @@ +// This file is dual licensed under the MIT and the University of Illinois Open +// Source Licenses. See LICENSE.TXT for details. + +#include "../assembly.h" + +// __chkstk routine +// This routine is windows specific. +// http://msdn.microsoft.com/en-us/library/ms648426.aspx + +// This clobbers the register r12, and the condition codes, and uses r5 and r6 +// as temporaries by backing them up and restoring them afterwards. +// Does not modify any memory or the stack pointer. + +// movw r4, #256 // Number of bytes of stack, in units of 4 byte +// bl __chkstk +// sub.w sp, sp, r4 + +#define PAGE_SIZE 4096 + + .p2align 2 +DEFINE_COMPILERRT_FUNCTION(__chkstk) + lsl r4, r4, #2 + mov r12, sp + push {r5, r6} + mov r5, r4 +1: + sub r12, r12, #PAGE_SIZE + subs r5, r5, #PAGE_SIZE + ldr r6, [r12] + bgt 1b + + pop {r5, r6} + bx lr +END_COMPILERRT_FUNCTION(__chkstk) |