From a22026054ba1a9befadef306c3f56481b4397ab3 Mon Sep 17 00:00:00 2001 From: Martin Storsjo Date: Tue, 17 Jul 2018 19:14:47 +0000 Subject: [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 --- lib/builtins/CMakeLists.txt | 1 + lib/builtins/arm/chkstk.S | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) create mode 100644 lib/builtins/arm/chkstk.S (limited to 'lib') 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) -- cgit v1.2.3