Update.
2001-04-07 Ulrich Drepper <drepper@redhat.com> * 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.
This commit is contained in:
Ulrich Drepper
parent
71483c00a8
commit
4ee87eccd9
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@ -1,3 +1,12 @@
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2001-04-07 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/unix/sysv/linux/i386/getcontext.S: New file.
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* sysdeps/unix/sysv/linux/i386/setcontext.S: New file.
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* sysdeps/unix/sysv/linux/i386/makecontext.S: New file.
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* sysdeps/unix/sysv/linux/i386/swapcontext.S: New file.
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* sysdeps/unix/sysv/linux/i386/ucontext_i.h: New file.
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* sysdeps/unix/sysv/linux/i386/Dist: Add ucontext_i.h.
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2001-04-07 Andreas Jaeger <aj@suse.de>
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* sysdeps/ieee754/ldbl-96/e_j1l.c (__ieee754_y1l): Use sincos
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@ -14,3 +14,4 @@ sys/procfs.h
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sys/reg.h
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sys/user.h
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sys/vm86.h
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ucontext_i.h
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@ -0,0 +1,113 @@
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/* Create new context.
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Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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ENTRY(__makecontext)
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movl 4(%esp), %eax
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/* Load the address of the function we are supposed to run. */
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movl 8(%esp), %ecx
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/* Compute the address of the stack. The information comes from
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to us_stack element. */
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movl oSS_SP(%eax), %edx
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movl %ecx, oEIP(%eax)
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addl oSS_SIZE(%eax), %edx
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/* Put the next context on the new stack (from the uc_link
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element). */
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movl oLINK(%eax), %ecx
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movl %ecx, -4(%edx)
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/* Remember the number of parameters for the exit handler since
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it has to remove them. We store the number in the EBX register
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which the function we will call must preserve. */
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movl 12(%esp), %ecx
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movl %ecx, oEBX(%eax)
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/* Make room on the new stack for the parameters. */
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negl %ecx
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leal -8(%edx,%ecx,4), %edx
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negl %ecx
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/* Store the future stack pointer. */
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movl %edx, oESP(%eax)
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/* Copy all the parameters. */
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jecxz 2f
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1: movl 12(%esp,%ecx,4), %eax
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movl %eax, (%edx,%ecx,4)
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decl %ecx
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jnz 1b
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2:
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/* If the function we call returns we must continue with the
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context which is given in the uc_link element. To do this
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set the return address for the function the user provides
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to a little bit of helper code which does the magic (see
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below). */
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#ifdef PIC
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call 1f
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1: popl %ecx
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addl $L(exitcode)-1b, %ecx
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movl %ecx, (%edx)
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#else
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movl $L(exitcode), (%edx)
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#endif
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/* 'makecontext' returns no value. */
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ret
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/* This is the helper code which gets called if a function which
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is registered with 'makecontext' returns. In this case we
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have to install the context listed in the uc_link element of
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the context 'makecontext' manipulated at the time of the
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'makecontext' call. If the pointer is NULL the process must
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terminate. */
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L(exitcode):
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/* This removes the parameters passed to the function given to
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'makecontext' from the stack. EBX contains the number of
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parameters (see above). */
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leal (%esp,%ebx,4), %esp
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#ifdef PIC
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call 1f
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1: popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
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#endif
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popl %eax /* This is the next context. */
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testl %eax, %eax
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je 2f /* If it is zero exit. */
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pushl %eax
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call JUMPTARGET(__setcontext)
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/* If this returns (which can happen if the syscall fails) we'll
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exit the program with the return error value (-1). */
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2: pushl %eax
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call JUMPTARGET(exit)
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/* The 'exit' call should never return. In case it does cause
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the process to terminate. */
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hlt
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END(__makecontext)
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weak_alias(__makecontext, makecontext)
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@ -0,0 +1,96 @@
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/* Install given context.
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Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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ENTRY(__setcontext)
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/* Load address of the context data structure. */
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movl 4(%esp), %eax
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/* Get the current signal mask. Note that we preserve EBX in case
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the system call fails and we return from the function with an
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error. */
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pushl %ebx
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xorl %edx, %edx
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leal oSIGMASK(%eax), %ecx
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movl $SIG_SETMASK, %ebx
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movl $__NR_sigprocmask, %eax
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int $0x80
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popl %ebx
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cmpl $-4095, %eax /* Check %eax for error. */
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jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
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/* EAX was modified, reload it. */
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movl 4(%esp), %eax
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/* Restore the floating-point context. Not the registers, only the
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rest. */
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movl oFPREGS(%eax), %ecx
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fldenv (%ecx)
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/* Restore the FS and GS segment registers. */
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movl oGS(%eax), %edx
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movl oFS(%eax), %ecx
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movw %dx, %gs
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movw %cx, %fs
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/* Load the new stack pointer. */
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movl oESP(%eax), %ecx
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/* Make room for 8 registers and the return address. We will load
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the values from the stack. */
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subl $36, %ecx
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/* Move the values of all the 32-bit registers (except ESP) on
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the stack. This happens in the form the 'popa' instruction
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expects it. Before this block put the address of the code
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to execute. */
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movl oEDI(%eax), %ebx
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movl oESI(%eax), %edx
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movl oEBP(%eax), %esi
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movl oEBX(%eax), %edi
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movl %ebx, (%ecx)
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movl %edx, 4(%ecx)
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movl %esi, 8(%ecx)
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movl %edi, 16(%ecx)
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movl oEDX(%eax), %ebx
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movl oECX(%eax), %edx
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movl oEAX(%eax), %esi
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movl oEIP(%eax), %edi
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movl %ebx, 20(%ecx)
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movl %edx, 24(%ecx)
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movl %esi, 28(%ecx)
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movl %edi, 32(%ecx)
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/* Set the new stack address. The stack points now to the block
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we put the register content in. */
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movl %ecx, %esp
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/* Restore the register content. */
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popa
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/* The following 'ret' will pop the addres of the code and jump
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to it. */
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L(pseudo_end):
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ret
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PSEUDO_END(__setcontext)
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weak_alias(__setcontext, setcontext)
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@ -0,0 +1,129 @@
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/* Save current context and install the given one.
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Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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ENTRY(__swapcontext)
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/* Load address of the context data structure we save in. */
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movl 4(%esp), %eax
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/* Return value of swapcontext. EAX is the only register whose
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value is not preserved. */
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movl $0, oEAX(%eax)
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/* Save the 32-bit register values and the return address. */
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movl %ecx, oECX(%eax)
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movl %edx, oEDX(%eax)
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movl %edi, oEDI(%eax)
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movl %esi, oESI(%eax)
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movl %ebp, oEBP(%eax)
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movl (%esp), %ecx
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movl %ecx, oEIP(%eax)
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leal 4(%esp), %ecx
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movl %ecx, oESP(%eax)
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movl %ebx, oEBX(%eax)
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/* Save the FS and GS segment register. */
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xorl %edx, %edx
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xorl %ecx, %ecx
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movw %gs, %dx
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movw %fs, %cx
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movl %edx, oGS(%eax)
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movl %ecx, oFS(%eax)
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/* We have separate floating-point register content memory on the
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stack. We use the __fpregs_mem block in the context. Set the
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links up correctly. */
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leal oFPREGSMEM(%eax), %ecx
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movl %ecx, oFPREGS(%eax)
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/* Save the floating-point context. */
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fnstenv (%ecx)
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/* Load address of the context data structure we have to load. */
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movl 8(%esp), %ecx
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/* Save the current signal mask and install the new one. */
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pushl %ebx
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leal oSIGMASK(%eax), %edx
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leal oSIGMASK(%ecx), %ecx
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movl $SIG_SETMASK, %ebx
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movl $__NR_sigprocmask, %eax
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int $0x80
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popl %ebx
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cmpl $-4095, %eax /* Check %eax for error. */
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jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
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/* EAX was modified, reload it. */
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movl 8(%esp), %eax
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/* Restore the floating-point context. Not the registers, only the
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rest. */
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movl oFPREGS(%eax), %ecx
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fldenv (%ecx)
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/* Restore the FS and GS segment registers. */
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movl oGS(%eax), %edx
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movl oFS(%eax), %ecx
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movw %dx, %gs
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movw %cx, %fs
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/* Load the new stack pointer. */
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movl oESP(%eax), %ecx
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/* Make room for 8 registers and the return address. We will load
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the values from the stack. */
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subl $36, %ecx
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/* Move the values of all the 32-bit registers (except ESP) on
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the stack. This happens in the form the 'popa' instruction
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expects it. Before this block put the address of the code
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to execute. */
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movl oEDI(%eax), %ebx
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movl oESI(%eax), %edx
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movl oEBP(%eax), %esi
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movl oEBX(%eax), %edi
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movl %ebx, (%ecx)
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movl %edx, 4(%ecx)
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movl %esi, 8(%ecx)
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movl %edi, 16(%ecx)
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movl oEDX(%eax), %ebx
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movl oECX(%eax), %edx
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movl oEAX(%eax), %esi
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movl oEIP(%eax), %edi
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movl %ebx, 20(%ecx)
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movl %edx, 24(%ecx)
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movl %esi, 28(%ecx)
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movl %edi, 32(%ecx)
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/* Set the new stack address. The stack points now to the block
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we put the register content in. */
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movl %ecx, %esp
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/* Restore the register content. */
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popa
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/* The following 'ret' will pop the addres of the code and jump
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to it. */
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L(pseudo_end):
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ret
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PSEUDO_END(__swapcontext)
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weak_alias(__swapcontext, swapcontext)
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@ -0,0 +1,41 @@
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/* Offsets and other constants needed in the *context() function
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implementation.
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Copyright (C) 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
|
||||
|
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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. */
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#define SIG_BLOCK 0
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#define SIG_SETMASK 2
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/* Offsets of the fields in the ucontext_t structure. */
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#define oLINK 4
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#define oSS_SP 8
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#define oSS_SIZE 16
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#define oGS 20
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#define oFS 24
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#define oEDI 36
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#define oESI 40
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#define oEBP 44
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#define oESP 48
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#define oEBX 52
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#define oEDX 56
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#define oECX 60
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#define oEAX 64
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#define oEIP 76
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#define oFPREGS 96
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#define oSIGMASK 108
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#define oFPREGSMEM 236
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Loading…
Reference in New Issue