diff options
Diffstat (limited to 'compiler-rt/lib/builtins')
| -rw-r--r-- | compiler-rt/lib/builtins/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | compiler-rt/lib/builtins/arm/chkstk.S | 34 |
2 files changed, 35 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/CMakeLists.txt b/compiler-rt/lib/builtins/CMakeLists.txt index 99184baf5bc..75ff6640564 100644 --- a/compiler-rt/lib/builtins/CMakeLists.txt +++ b/compiler-rt/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/compiler-rt/lib/builtins/arm/chkstk.S b/compiler-rt/lib/builtins/arm/chkstk.S new file mode 100644 index 00000000000..e3002105897 --- /dev/null +++ b/compiler-rt/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) |
