From 06bcdbfcc0962c0312cb4bfa4ec6447254a511c4 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 22 Jul 1995 10:47:25 +0000 Subject: [PATCH] Include . Save %ebx in call-clobbered %edx instead of stack. Use JUMPTARGET(syscall_error) in jump insn. --- sysdeps/unix/sysv/sysv4/linux/i386/socket.S | 54 +++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 sysdeps/unix/sysv/sysv4/linux/i386/socket.S diff --git a/sysdeps/unix/sysv/sysv4/linux/i386/socket.S b/sysdeps/unix/sysv/sysv4/linux/i386/socket.S new file mode 100644 index 0000000..7b8dd75 --- /dev/null +++ b/sysdeps/unix/sysv/sysv4/linux/i386/socket.S @@ -0,0 +1,54 @@ +/* Copyright (C) 1995 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 +#include + +.globl syscall_error + +/* The socket-oriented system calls are handled unusally in Linux. + They are all gated through the single `socketcall' system call number. + `socketcall' takes two arguments: the first is the subcode, specifying + which socket function is being called; and the second is a pointer to + the arguments to the specific function. + + The .S files for the other calls just #define socket and #include this. */ + +ENTRY (socket) + + /* Save registers. */ + movl %ebx, %edx + + movl $SYS_socketcall, %eax /* System call number in %eax. */ + + /* Use ## so `socket' is a separate token that might be #define'd. */ + movl $SYS_##socket, %ebx /* Subcode is first arg to syscall. */ + lea 8(%esp), %ecx /* Address of args is 2nd arg. */ + + /* Do the system call trap. */ + int $0x80 + + /* Restore registers. */ + movl %edx, %ebx + + /* %eax is < 0 if there was an error. */ + testl %eax, %eax + jl JUMPTARGET(syscall_error) + + /* Successful; return the syscall's value. */ + ret -- 2.7.4