1*7c3d14c8STreehugger Robot// This file is dual licensed under the MIT and the University of Illinois Open 2*7c3d14c8STreehugger Robot// Source Licenses. See LICENSE.TXT for details. 3*7c3d14c8STreehugger Robot 4*7c3d14c8STreehugger Robot#include "../assembly.h" 5*7c3d14c8STreehugger Robot 6*7c3d14c8STreehugger Robot// _chkstk routine 7*7c3d14c8STreehugger Robot// This routine is windows specific 8*7c3d14c8STreehugger Robot// http://msdn.microsoft.com/en-us/library/ms648426.aspx 9*7c3d14c8STreehugger Robot 10*7c3d14c8STreehugger Robot// Notes from r227519 11*7c3d14c8STreehugger Robot// MSVC x64s __chkstk and cygmings ___chkstk_ms do not adjust %rsp 12*7c3d14c8STreehugger Robot// themselves. It also does not clobber %rax so we can reuse it when 13*7c3d14c8STreehugger Robot// adjusting %rsp. 14*7c3d14c8STreehugger Robot 15*7c3d14c8STreehugger Robot#ifdef __x86_64__ 16*7c3d14c8STreehugger Robot 17*7c3d14c8STreehugger Robot.text 18*7c3d14c8STreehugger Robot.balign 4 19*7c3d14c8STreehugger RobotDEFINE_COMPILERRT_FUNCTION(___chkstk_ms) 20*7c3d14c8STreehugger Robot push %rcx 21*7c3d14c8STreehugger Robot push %rax 22*7c3d14c8STreehugger Robot cmp $0x1000,%rax 23*7c3d14c8STreehugger Robot lea 24(%rsp),%rcx 24*7c3d14c8STreehugger Robot jb 1f 25*7c3d14c8STreehugger Robot2: 26*7c3d14c8STreehugger Robot sub $0x1000,%rcx 27*7c3d14c8STreehugger Robot test %rcx,(%rcx) 28*7c3d14c8STreehugger Robot sub $0x1000,%rax 29*7c3d14c8STreehugger Robot cmp $0x1000,%rax 30*7c3d14c8STreehugger Robot ja 2b 31*7c3d14c8STreehugger Robot1: 32*7c3d14c8STreehugger Robot sub %rax,%rcx 33*7c3d14c8STreehugger Robot test %rcx,(%rcx) 34*7c3d14c8STreehugger Robot pop %rax 35*7c3d14c8STreehugger Robot pop %rcx 36*7c3d14c8STreehugger Robot ret 37*7c3d14c8STreehugger RobotEND_COMPILERRT_FUNCTION(___chkstk_ms) 38*7c3d14c8STreehugger Robot 39*7c3d14c8STreehugger Robot#endif // __x86_64__ 40