From 4ee87eccd95908f1804412f274ef8595fff376b7 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Sat, 7 Apr 2001 20:09:42 +0000 Subject: Update. 2001-04-07 Ulrich Drepper * sysdeps/unix/sysv/linux/i386/getcontext.S: New file. * sysdeps/unix/sysv/linux/i386/setcontext.S: New file. * sysdeps/unix/sysv/linux/i386/makecontext.S: New file. * sysdeps/unix/sysv/linux/i386/swapcontext.S: New file. * sysdeps/unix/sysv/linux/i386/ucontext_i.h: New file. * sysdeps/unix/sysv/linux/i386/Dist: Add ucontext_i.h. --- sysdeps/unix/sysv/linux/i386/setcontext.S | 96 +++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/i386/setcontext.S (limited to 'sysdeps/unix/sysv/linux/i386/setcontext.S') diff --git a/sysdeps/unix/sysv/linux/i386/setcontext.S b/sysdeps/unix/sysv/linux/i386/setcontext.S new file mode 100644 index 0000000000..cd4b1bfe8a --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/setcontext.S @@ -0,0 +1,96 @@ +/* Install given context. + Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +#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 + xorl %edx, %edx + leal oSIGMASK(%eax), %ecx + movl $SIG_SETMASK, %ebx + movl $__NR_sigprocmask, %eax + int $0x80 + popl %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 and GS segment registers. */ + movl oGS(%eax), %edx + movl oFS(%eax), %ecx + movw %dx, %gs + movw %cx, %fs + + /* Load the new stack pointer. */ + movl oESP(%eax), %ecx + /* Make room for 8 registers and the return address. We will load + the values from the stack. */ + subl $36, %ecx + + /* Move the values of all the 32-bit registers (except ESP) on + the stack. This happens in the form the 'popa' instruction + expects it. Before this block put the address of the code + to execute. */ + movl oEDI(%eax), %ebx + movl oESI(%eax), %edx + movl oEBP(%eax), %esi + movl oEBX(%eax), %edi + movl %ebx, (%ecx) + movl %edx, 4(%ecx) + movl %esi, 8(%ecx) + movl %edi, 16(%ecx) + movl oEDX(%eax), %ebx + movl oECX(%eax), %edx + movl oEAX(%eax), %esi + movl oEIP(%eax), %edi + movl %ebx, 20(%ecx) + movl %edx, 24(%ecx) + movl %esi, 28(%ecx) + movl %edi, 32(%ecx) + + /* Set the new stack address. The stack points now to the block + we put the register content in. */ + movl %ecx, %esp + /* Restore the register content. */ + popa + /* The following 'ret' will pop the addres of the code and jump + to it. */ + +L(pseudo_end): + ret +PSEUDO_END(__setcontext) + +weak_alias(__setcontext, setcontext) -- cgit v1.2.1