diff options
Diffstat (limited to 'src/third_party/unwind/dist/src/x86_64/setcontext.S')
| -rw-r--r-- | src/third_party/unwind/dist/src/x86_64/setcontext.S | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/third_party/unwind/dist/src/x86_64/setcontext.S b/src/third_party/unwind/dist/src/x86_64/setcontext.S new file mode 100644 index 00000000000..358217defba --- /dev/null +++ b/src/third_party/unwind/dist/src/x86_64/setcontext.S @@ -0,0 +1,83 @@ +/* libunwind - a platform-independent unwind library + Copyright (C) 2007 Google, Inc + Contributed by Arun Sharma <arun.sharma@google.com> + Copyright (C) 2010 Konstantin Belousov <kib@freebsd.org> + +This file is part of libunwind. + +Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ + +#include "ucontext_i.h" + +/* int _Ux86_64_setcontext (const ucontext_t *ucp) + + Restores the machine context provided. + Unlike the libc implementation, doesn't clobber %rax + +*/ + .global _Ux86_64_setcontext + .type _Ux86_64_setcontext, @function + +_Ux86_64_setcontext: + +#if defined __linux__ + /* restore fp state */ + mov UC_MCONTEXT_FPREGS_PTR(%rdi),%r8 + fldenv (%r8) + ldmxcsr FPREGS_OFFSET_MXCSR(%r8) +#elif defined __FreeBSD__ + /* restore fp state */ + cmpq $UC_MCONTEXT_FPOWNED_FPU,UC_MCONTEXT_OWNEDFP(%rdi) + jne 1f + cmpq $UC_MCONTEXT_FPFMT_XMM,UC_MCONTEXT_FPFORMAT(%rdi) + jne 1f + fxrstor UC_MCONTEXT_FPSTATE(%rdi) +1: +#else +#error Port me +#endif + + /* restore the rest of the state */ + mov UC_MCONTEXT_GREGS_R8(%rdi),%r8 + mov UC_MCONTEXT_GREGS_R9(%rdi),%r9 + mov UC_MCONTEXT_GREGS_RBX(%rdi),%rbx + mov UC_MCONTEXT_GREGS_RBP(%rdi),%rbp + mov UC_MCONTEXT_GREGS_R12(%rdi),%r12 + mov UC_MCONTEXT_GREGS_R13(%rdi),%r13 + mov UC_MCONTEXT_GREGS_R14(%rdi),%r14 + mov UC_MCONTEXT_GREGS_R15(%rdi),%r15 + mov UC_MCONTEXT_GREGS_RSI(%rdi),%rsi + mov UC_MCONTEXT_GREGS_RDX(%rdi),%rdx + mov UC_MCONTEXT_GREGS_RAX(%rdi),%rax + mov UC_MCONTEXT_GREGS_RCX(%rdi),%rcx + mov UC_MCONTEXT_GREGS_RSP(%rdi),%rsp + + /* push the return address on the stack */ + mov UC_MCONTEXT_GREGS_RIP(%rdi),%rcx + push %rcx + + mov UC_MCONTEXT_GREGS_RCX(%rdi),%rcx + mov UC_MCONTEXT_GREGS_RDI(%rdi),%rdi + retq + + .size _Ux86_64_setcontext, . - _Ux86_64_setcontext + + /* We do not need executable stack. */ + .section .note.GNU-stack,"",@progbits |