diff options
Diffstat (limited to 'sysdeps/mach/hurd/x86_64/getcontext.S')
-rw-r--r-- | sysdeps/mach/hurd/x86_64/getcontext.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/x86_64/getcontext.S b/sysdeps/mach/hurd/x86_64/getcontext.S new file mode 100644 index 0000000000..ef431be1a3 --- /dev/null +++ b/sysdeps/mach/hurd/x86_64/getcontext.S @@ -0,0 +1,68 @@ +/* Save current context. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + <https://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +#include "ucontext_i.h" + + +ENTRY(__getcontext) + /* Save the preserved registers, the registers used for passing + args, and the return address. */ + movq %rbx, oRBX(%rdi) + movq %rbp, oRBP(%rdi) + movq %r12, oR12(%rdi) + movq %r13, oR13(%rdi) + movq %r14, oR14(%rdi) + movq %r15, oR15(%rdi) + + movq %rdi, oRDI(%rdi) + movq %rsi, oRSI(%rdi) + movq %rdx, oRDX(%rdi) + movq %rcx, oRCX(%rdi) + movq %r8, oR8(%rdi) + movq %r9, oR9(%rdi) + + movq (%rsp), %rcx + movq %rcx, oRIP(%rdi) + leaq 8(%rsp), %rcx /* Exclude the return address. */ + movq %rcx, oRSP(%rdi) + + /* We have separate floating-point register content memory on the + stack. We use the __fpregs_mem block in the context. Set the + links up correctly. */ + + leaq oFPREGSMEM(%rdi), %rcx + movq %rcx, oFPREGS(%rdi) + /* Save the floating-point environment. */ + fnstenv (%rcx) + fldenv (%rcx) + stmxcsr oMXCSR(%rdi) + + /* Save the current signal mask with + * __sigprocmask(SIG_BLOCK, NULL, oSIGMASK(%rdi)); */ + leaq oSIGMASK(%rdi), %rdx + movq $0, %rsi + movl $SIG_BLOCK, %edi + call HIDDEN_JUMPTARGET (__sigprocmask) + + /* Propagate %rax (and errno, in case). */ + ret +PSEUDO_END(__getcontext) + +weak_alias (__getcontext, getcontext) |