From b128f924ec347d3b1f0287957f8b40f03b1dd8f1 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Fri, 9 Apr 1993 01:33:44 +0000 Subject: [PATCH] Initial revision --- sysdeps/unix/bsd/sequent/i386/sigvec.S | 45 ++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 sysdeps/unix/bsd/sequent/i386/sigvec.S diff --git a/sysdeps/unix/bsd/sequent/i386/sigvec.S b/sysdeps/unix/bsd/sequent/i386/sigvec.S new file mode 100644 index 0000000000..03b1c7df4f --- /dev/null +++ b/sysdeps/unix/bsd/sequent/i386/sigvec.S @@ -0,0 +1,45 @@ +/* Copyright (C) 1993 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 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., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include + +/* The Dynix `sigvec' system call takes an extra argument, + which is the address of the trampoline function. */ + +.text +.align 4 +trampoline: + cld /* Clear direction flag. */ + call %eax /* Call the handler, address in %eax. */ + addl $8, %esp /* Pop signum & code off the stack. */ + /* __sigreturn will restore the context, and never return here. */ + jsr C_SYMBOL_NAME (__sigreturn) + +.globl syscall_error +ENTRY (__sigvec) + /* Put the address of the trampoline in a scratch register. */ + mov $trampoline, %edx + /* Now exchange this register with the top of the stack, + wherein now lies the return PC. */ + xchg 0(%esp), %edx + mov %esp, %ecx /* Point the syscall at the arguments. */ + DO_CALL (sigvec, 4) /* Do the system call. */ + /* Exchange again, restoring the return PC. */ + xchg 0(%esp), %edx + jb syscall_error /* Check for error. */ + ret