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46 lines
1.7 KiB
ArmAsm
46 lines
1.7 KiB
ArmAsm
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/* Copyright (C) 1993 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
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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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sysdep.h>
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/* The Dynix `sigvec' system call takes an extra argument,
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which is the address of the trampoline function. */
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.text
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.align 4
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trampoline:
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cld /* Clear direction flag. */
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call %eax /* Call the handler, address in %eax. */
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addl $8, %esp /* Pop signum & code off the stack. */
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/* __sigreturn will restore the context, and never return here. */
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jsr C_SYMBOL_NAME (__sigreturn)
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.globl syscall_error
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ENTRY (__sigvec)
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/* Put the address of the trampoline in a scratch register. */
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mov $trampoline, %edx
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/* Now exchange this register with the top of the stack,
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wherein now lies the return PC. */
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xchg 0(%esp), %edx
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mov %esp, %ecx /* Point the syscall at the arguments. */
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DO_CALL (sigvec, 4) /* Do the system call. */
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/* Exchange again, restoring the return PC. */
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xchg 0(%esp), %edx
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jb syscall_error /* Check for error. */
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ret
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