| /* Install given context. |
| Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. |
| |
| 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" |
| |
| |
| ENTRY(__setcontext) |
| /* Load address of the context data structure. */ |
| movl 4(%esp), %eax |
| |
| /* Get the current signal mask. Note that we preserve EBX in case |
| the system call fails and we return from the function with an |
| error. */ |
| pushl %ebx |
| cfi_adjust_cfa_offset (4) |
| xorl %edx, %edx |
| leal oSIGMASK(%eax), %ecx |
| movl $SIG_SETMASK, %ebx |
| cfi_rel_offset (ebx, 0) |
| movl $__NR_sigprocmask, %eax |
| ENTER_KERNEL |
| popl %ebx |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (ebx) |
| cmpl $-4095, %eax /* Check %eax for error. */ |
| jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ |
| |
| /* EAX was modified, reload it. */ |
| movl 4(%esp), %eax |
| |
| /* Restore the floating-point context. Not the registers, only the |
| rest. */ |
| movl oFPREGS(%eax), %ecx |
| fldenv (%ecx) |
| |
| /* Restore the FS segment register. We don't touch the GS register |
| since it is used for threads. */ |
| movl oFS(%eax), %ecx |
| movw %cx, %fs |
| |
| /* Fetch the address to return to. */ |
| movl oEIP(%eax), %ecx |
| |
| /* Load the new stack pointer. */ |
| cfi_def_cfa (eax, 0) |
| cfi_offset (edi, oEDI) |
| cfi_offset (esi, oESI) |
| cfi_offset (ebp, oEBP) |
| cfi_offset (ebx, oEBX) |
| cfi_offset (edx, oEDX) |
| cfi_offset (ecx, oECX) |
| movl oESP(%eax), %esp |
| |
| /* Push the return address on the new stack so we can return there. */ |
| pushl %ecx |
| |
| /* Load the values of all the 32-bit registers (except ESP). |
| Since we are loading from EAX, it must be last. */ |
| movl oEDI(%eax), %edi |
| movl oESI(%eax), %esi |
| movl oEBP(%eax), %ebp |
| movl oEBX(%eax), %ebx |
| movl oEDX(%eax), %edx |
| movl oECX(%eax), %ecx |
| movl oEAX(%eax), %eax |
| |
| /* End FDE here, we fall into another context. */ |
| cfi_endproc |
| cfi_startproc |
| |
| /* The following 'ret' will pop the address of the code and jump |
| to it. */ |
| |
| L(pseudo_end): |
| ret |
| PSEUDO_END(__setcontext) |
| |
| weak_alias (__setcontext, setcontext) |
