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Diffstat (limited to 'src/x86/getcontext-solaris.S')
-rw-r--r-- | src/x86/getcontext-solaris.S | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/x86/getcontext-solaris.S b/src/x86/getcontext-solaris.S new file mode 100644 index 00000000..c469dadb --- /dev/null +++ b/src/x86/getcontext-solaris.S @@ -0,0 +1,74 @@ +/* libunwind - a platform-independent unwind library + Copyright (C) 2009 Google, Inc + Contributed by Paul Pluzhnikov <ppluzhnikov@google.com> + +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 "offsets.h" + +/* int _Ux86_getcontext (ucontext_t *ucp) + + Saves the machine context in UCP necessary for libunwind. + Unlike the libc implementation, we don't save the signal mask + and hence avoid the cost of a system call per unwind. + +*/ + + .global _Ux86_getcontext + .type _Ux86_getcontext, @function +_Ux86_getcontext: + .cfi_startproc + mov 4(%esp),%eax /* ucontext_t* */ + + /* EAX is not preserved. */ + movl $0, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EAX_OFF)(%eax) + + movl %ebx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EBX_OFF)(%eax) + movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ECX_OFF)(%eax) + movl %edx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EDX_OFF)(%eax) + movl %edi, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EDI_OFF)(%eax) + movl %esi, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ESI_OFF)(%eax) + movl %ebp, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EBP_OFF)(%eax) + + movl (%esp), %ecx + movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_EIP_OFF)(%eax) + + leal 4(%esp), %ecx /* Exclude the return address. */ + movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_ESP_OFF)(%eax) + + /* glibc getcontext saves FS, but not GS */ + xorl %ecx, %ecx + movw %fs, %cx + movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_FS_OFF)(%eax) + + leal LINUX_UC_FPREGS_MEM_OFF(%eax), %ecx + movl %ecx, (LINUX_UC_MCONTEXT_OFF+LINUX_SC_FPSTATE_OFF)(%eax) + fnstenv (%ecx) + fldenv (%ecx) + + xor %eax, %eax + ret + .cfi_endproc + .size _Ux86_getcontext, . - _Ux86_getcontext + + /* We do not need executable stack. */ + .section .note.GNU-stack,"",@progbits |