Implement x86 chkstk in "rust"
Matt Ickstadt
parent
35dec6bd8a
commit
b3679bcfba
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@ -159,8 +159,8 @@ features = ["c"]
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- [x] floatunsisf.c
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- [ ] i386/ashldi3.S
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- [ ] i386/ashrdi3.S
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- [ ] i386/chkstk.S
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- [ ] i386/chkstk2.S
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- [x] i386/chkstk.S
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- [x] i386/chkstk2.S
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- [ ] i386/divdi3.S
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- [ ] i386/lshrdi3.S
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- [ ] i386/moddi3.S
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2
build.rs
2
build.rs
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@ -4176,8 +4176,6 @@ mod c {
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&[
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"i386/ashldi3.S",
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"i386/ashrdi3.S",
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"i386/chkstk.S",
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"i386/chkstk2.S",
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"i386/divdi3.S",
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"i386/floatdidf.S",
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"i386/floatdisf.S",
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@ -51,6 +51,9 @@ pub mod mem;
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#[cfg(target_arch = "arm")]
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pub mod arm;
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#[cfg(target_arch = "x86")]
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pub mod x86;
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#[cfg(target_arch = "x86_64")]
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pub mod x86_64;
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@ -0,0 +1,71 @@
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#![allow(unused_imports)]
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use core::intrinsics;
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// NOTE These functions are implemented using assembly because they using a custom
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// calling convention which can't be implemented using a normal Rust function
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// NOTE These functions are never mangled as they are not tested against compiler-rt
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// and mangling ___chkstk would break the `jmp ___chkstk` instruction in __alloca
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#[cfg(all(windows, target_env = "gnu"))]
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#[naked]
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#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
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pub unsafe fn ___chkstk_ms() {
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asm!("
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push %ecx
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push %eax
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cmp $$0x1000,%eax
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lea 12(%esp),%ecx
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jb 1f
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2:
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sub $$0x1000,%ecx
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test %ecx,(%ecx)
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sub $$0x1000,%eax
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cmp $$0x1000,%eax
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ja 2b
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1:
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sub %eax,%ecx
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test %ecx,(%ecx)
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pop %eax
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pop %ecx
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ret");
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intrinsics::unreachable();
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}
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// FIXME: __alloca should be an alias to __chkstk
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#[cfg(all(windows, target_env = "gnu"))]
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#[naked]
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#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
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pub unsafe fn __alloca() {
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asm!("jmp ___chkstk // Jump to ___chkstk since fallthrough may be unreliable");
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intrinsics::unreachable();
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}
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#[cfg(all(windows, target_env = "gnu"))]
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#[naked]
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#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
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pub unsafe fn ___chkstk() {
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asm!("
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push %ecx
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cmp $$0x1000,%eax
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lea 8(%esp),%ecx // esp before calling this routine -> ecx
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jb 1f
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2:
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sub $$0x1000,%ecx
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test %ecx,(%ecx)
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sub $$0x1000,%eax
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cmp $$0x1000,%eax
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ja 2b
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1:
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sub %eax,%ecx
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test %ecx,(%ecx)
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lea 4(%esp),%eax // load pointer to the return address into eax
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mov %ecx,%esp // install the new top of stack pointer into esp
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mov -4(%eax),%ecx // restore ecx
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push (%eax) // push return address onto the stack
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sub %esp,%eax // restore the original value in eax
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ret");
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intrinsics::unreachable();
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}
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@ -12,23 +12,24 @@ use core::intrinsics;
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#[naked]
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#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
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pub unsafe fn ___chkstk_ms() {
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asm!("push %rcx
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push %rax
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cmp $$0x1000,%rax
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lea 24(%rsp),%rcx
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jb 1f
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2:
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sub $$0x1000,%rcx
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test %rcx,(%rcx)
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sub $$0x1000,%rax
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cmp $$0x1000,%rax
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ja 2b
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1:
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sub %rax,%rcx
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test %rcx,(%rcx)
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pop %rax
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pop %rcx
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ret");
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asm!("
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push %rcx
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push %rax
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cmp $$0x1000,%rax
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lea 24(%rsp),%rcx
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jb 1f
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2:
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sub $$0x1000,%rcx
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test %rcx,(%rcx)
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sub $$0x1000,%rax
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cmp $$0x1000,%rax
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ja 2b
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1:
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sub %rax,%rcx
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test %rcx,(%rcx)
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pop %rax
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pop %rcx
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ret");
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intrinsics::unreachable();
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}
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@ -45,25 +46,26 @@ pub unsafe fn __alloca() {
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#[naked]
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#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
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pub unsafe fn ___chkstk() {
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asm!("push %rcx
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cmp $$0x1000,%rax
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lea 16(%rsp),%rcx // rsp before calling this routine -> rcx
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jb 1f
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2:
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sub $$0x1000,%rcx
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test %rcx,(%rcx)
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sub $$0x1000,%rax
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cmp $$0x1000,%rax
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ja 2b
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1:
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sub %rax,%rcx
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test %rcx,(%rcx)
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asm!("
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push %rcx
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cmp $$0x1000,%rax
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lea 16(%rsp),%rcx // rsp before calling this routine -> rcx
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jb 1f
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2:
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sub $$0x1000,%rcx
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test %rcx,(%rcx)
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sub $$0x1000,%rax
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cmp $$0x1000,%rax
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ja 2b
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1:
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sub %rax,%rcx
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test %rcx,(%rcx)
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lea 8(%rsp),%rax // load pointer to the return address into rax
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mov %rcx,%rsp // install the new top of stack pointer into rsp
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mov -8(%rax),%rcx // restore rcx
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push (%rax) // push return address onto the stack
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sub %rsp,%rax // restore the original value in rax
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ret");
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lea 8(%rsp),%rax // load pointer to the return address into rax
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mov %rcx,%rsp // install the new top of stack pointer into rsp
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mov -8(%rax),%rcx // restore rcx
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push (%rax) // push return address onto the stack
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sub %rsp,%rax // restore the original value in rax
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ret");
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intrinsics::unreachable();
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}
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