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only export __chkstk for windows

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it's a windows only function anyway
This commit is contained in:
Andrew Kelley 2017-08-31 20:10:24 -04:00
parent e93ece7514
commit 06b64d82bf
1 changed files with 26 additions and 24 deletions
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50
std/special/compiler_rt/index.zig
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@ -101,30 +101,32 @@ export nakedcc fn __aeabi_uidivmod() {
export nakedcc fn __chkstk() {
@setDebugSafety(this, false);
if (comptime builtin.arch == builtin.Arch.x86_64) {
asm volatile (
\\ push %%rcx
\\ cmp $0x1000,%%rax
\\ lea 16(%%rsp),%%rcx // rsp before calling this routine -> rcx
\\ jb 1f
\\ 2:
\\ sub $0x1000,%%rcx
\\ test %%rcx,(%%rcx)
\\ sub $0x1000,%%rax
\\ cmp $0x1000,%%rax
\\ ja 2b
\\ 1:
\\ sub %%rax,%%rcx
\\ test %%rcx,(%%rcx)
\\
\\ lea 8(%%rsp),%%rax // load pointer to the return address into rax
\\ mov %%rcx,%%rsp // install the new top of stack pointer into rsp
\\ mov -8(%%rax),%%rcx // restore rcx
\\ push (%%rax) // push return address onto the stack
\\ sub %%rsp,%%rax // restore the original value in rax
\\ ret
);
unreachable;
if (comptime builtin.os == builtin.Os.windows) {
if (comptime builtin.arch == builtin.Arch.x86_64) {
asm volatile (
\\ push %%rcx
\\ cmp $0x1000,%%rax
\\ lea 16(%%rsp),%%rcx // rsp before calling this routine -> rcx
\\ jb 1f
\\ 2:
\\ sub $0x1000,%%rcx
\\ test %%rcx,(%%rcx)
\\ sub $0x1000,%%rax
\\ cmp $0x1000,%%rax
\\ ja 2b
\\ 1:
\\ sub %%rax,%%rcx
\\ test %%rcx,(%%rcx)
\\
\\ lea 8(%%rsp),%%rax // load pointer to the return address into rax
\\ mov %%rcx,%%rsp // install the new top of stack pointer into rsp
\\ mov -8(%%rax),%%rcx // restore rcx
\\ push (%%rax) // push return address onto the stack
\\ sub %%rsp,%%rax // restore the original value in rax
\\ ret
);
unreachable;
}
}
@setGlobalLinkage(__chkstk, builtin.GlobalLinkage.Internal);