| /* Install given context. |
| Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Andreas Jaeger <aj@suse.de>, 2002. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| |
| #include "ucontext_i.h" |
| |
| |
| /* int __setcontext (const ucontext_t *ucp) |
| |
| Restores the machine context in UCP and thereby resumes execution |
| in that context. |
| |
| This implementation is intended to be used for *synchronous* context |
| switches only. Therefore, it does not have to restore anything |
| other than the PRESERVED state. */ |
| |
| ENTRY(__setcontext) |
| /* Save argument since syscall will destroy it. */ |
| pushq %rdi |
| cfi_adjust_cfa_offset(8) |
| |
| /* Set the signal mask with |
| rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */ |
| leaq oSIGMASK(%rdi), %rsi |
| xorl %edx, %edx |
| movl $SIG_SETMASK, %edi |
| movl $_NSIG8,%r10d |
| movl $__NR_rt_sigprocmask, %eax |
| syscall |
| popq %rdi /* Reload %rdi, adjust stack. */ |
| cfi_adjust_cfa_offset(-8) |
| cmpq $-4095, %rax /* Check %rax for error. */ |
| jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ |
| |
| /* Restore the floating-point context. Not the registers, only the |
| rest. */ |
| movq oFPREGS(%rdi), %rcx |
| fldenv (%rcx) |
| ldmxcsr oMXCSR(%rdi) |
| |
| |
| /* Load the new stack pointer, the preserved registers and |
| registers used for passing args. */ |
| cfi_def_cfa(%rdi, 0) |
| cfi_offset(%rbx,oRBX) |
| cfi_offset(%rbp,oRBP) |
| cfi_offset(%r12,oR12) |
| cfi_offset(%r13,oR13) |
| cfi_offset(%r14,oR14) |
| cfi_offset(%r15,oR15) |
| cfi_offset(%rsp,oRSP) |
| cfi_offset(%rip,oRIP) |
| |
| movq oRSP(%rdi), %rsp |
| movq oRBX(%rdi), %rbx |
| movq oRBP(%rdi), %rbp |
| movq oR12(%rdi), %r12 |
| movq oR13(%rdi), %r13 |
| movq oR14(%rdi), %r14 |
| movq oR15(%rdi), %r15 |
| |
| /* The following ret should return to the address set with |
| getcontext. Therefore push the address on the stack. */ |
| movq oRIP(%rdi), %rcx |
| pushq %rcx |
| |
| movq oRSI(%rdi), %rsi |
| movq oRDX(%rdi), %rdx |
| movq oRCX(%rdi), %rcx |
| movq oR8(%rdi), %r8 |
| movq oR9(%rdi), %r9 |
| |
| /* Setup finally %rdi. */ |
| movq oRDI(%rdi), %rdi |
| |
| /* End FDE here, we fall into another context. */ |
| cfi_endproc |
| cfi_startproc |
| |
| /* Clear rax to indicate success. */ |
| xorl %eax, %eax |
| |
| L(pseudo_end): |
| ret |
| PSEUDO_END(__setcontext) |
| |
| weak_alias (__setcontext, setcontext) |
