forked from M-Labs/libfringe
arch/x86_64: hack to work around ld64 shortcomings on OS X.
fix #35, close #36
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@ -1,5 +1,8 @@
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language: rust
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rust: nightly
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os:
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- linux
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- osx
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sudo: false
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install:
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- .travis/docs/install
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@ -49,6 +49,7 @@ use stack::Stack;
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pub struct StackPointer(*mut usize);
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pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize) -> !) -> StackPointer {
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#[cfg(not(target_vendor = "apple"))]
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#[naked]
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unsafe extern "C" fn trampoline_1() {
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asm!(
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@ -77,6 +78,21 @@ pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize) -> !) -> StackP
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: : "s" (trampoline_2 as usize) : "memory" : "volatile")
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}
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#[cfg(target_vendor = "apple")]
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#[naked]
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unsafe extern "C" fn trampoline_1() {
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asm!(
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r#"
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# Same as above; however, .local and .size are not supported in Mach-O.
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__morestack:
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.private_extern __morestack
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.cfi_def_cfa %rbx, 0
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.cfi_offset %rbp, -16
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call ${0:c}
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"#
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: : "s" (trampoline_2 as usize) : "memory" : "volatile")
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}
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#[naked]
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unsafe extern "C" fn trampoline_2() {
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asm!(
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@ -84,7 +100,16 @@ pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize) -> !) -> StackP
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# Set up the second part of our DWARF CFI.
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# When unwinding the frame corresponding to this function, a DWARF unwinder
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# will restore %rbx (and thus CFA of the first trampoline) from the stack slot.
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.cfi_offset %rbx, 16
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#
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# The following is functionally equivalent to:
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# .cfi_offset %rbx, 16
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# however positive offsets in .cfi_offset translate to DW_CFA_offset_extended_sf,
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# and ld64's CFI parser only supports regular DW_CFA_offset (which only supports
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# negative offsets, with the sign being implicit), so to avoid crashing the linker
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# on OS X, fold offset into DW_CFA_def_offset.
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.cfi_def_cfa_offset 24
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.cfi_offset %rip, -24
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.cfi_offset %rbx, 0
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# Call the provided function.
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call *8(%rsp)
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"#
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@ -4,7 +4,7 @@
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// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
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// http://opensource.org/licenses/MIT>, at your option. This file may not be
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// copied, modified, or distributed except according to those terms.
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#![feature(asm, naked_functions)]
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#![feature(asm, naked_functions, cfg_target_vendor)]
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#![cfg_attr(feature = "alloc", feature(alloc))]
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#![cfg_attr(test, feature(test, thread_local, const_fn))]
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#![no_std]
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@ -17,13 +17,13 @@ use self::libc::MAP_FAILED;
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const GUARD_PROT: c_int = libc::PROT_NONE;
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const STACK_PROT: c_int = libc::PROT_READ
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| libc::PROT_WRITE;
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#[cfg(not(any(target_os = "freebsd", target_os = "dragonfly")))]
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#[cfg(not(any(target_os = "freebsd", target_os = "dragonfly", target_vendor = "apple")))]
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const STACK_FLAGS: c_int = libc::MAP_STACK
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| libc::MAP_PRIVATE
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| libc::MAP_ANON;
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// workaround for http://lists.freebsd.org/pipermail/freebsd-bugs/2011-July/044840.html
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// according to libgreen, DragonFlyBSD suffers from this too
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#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
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#[cfg(any(target_os = "freebsd", target_os = "dragonfly", target_vendor = "apple"))]
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const STACK_FLAGS: c_int = libc::MAP_PRIVATE
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| libc::MAP_ANON;
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