diff options
Diffstat (limited to 'libc/sysdeps/unix/sysv/linux/i386/socket.S')
-rw-r--r-- | libc/sysdeps/unix/sysv/linux/i386/socket.S | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/libc/sysdeps/unix/sysv/linux/i386/socket.S b/libc/sysdeps/unix/sysv/linux/i386/socket.S new file mode 100644 index 000000000..7c8ac29b8 --- /dev/null +++ b/libc/sysdeps/unix/sysv/linux/i386/socket.S @@ -0,0 +1,124 @@ +/* Copyright (C) 1995-1998,2002,2003,2005 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep-cancel.h> +#include <socketcall.h> +#include <tls.h> + +#define P(a, b) P2(a, b) +#define P2(a, b) a##b + + .text +/* 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. */ + +#ifndef __socket +# ifndef NO_WEAK_ALIAS +# define __socket P(__,socket) +# else +# define __socket socket +# endif +#endif + +.globl __socket +ENTRY (__socket) +#if defined NEED_CANCELLATION && defined CENABLE + SINGLE_THREAD_P + jne 1f +#endif + + /* Save registers. */ + movl %ebx, %edx + cfi_register (3, 2) + + movl $SYS_ify(socketcall), %eax /* System call number in %eax. */ + + /* Use ## so `socket' is a separate token that might be #define'd. */ + movl $P(SOCKOP_,socket), %ebx /* Subcode is first arg to syscall. */ + lea 4(%esp), %ecx /* Address of args is 2nd arg. */ + + /* Do the system call trap. */ + ENTER_KERNEL + + /* Restore registers. */ + movl %edx, %ebx + cfi_restore (3) + + /* %eax is < 0 if there was an error. */ + cmpl $-125, %eax + jae SYSCALL_ERROR_LABEL + + /* Successful; return the syscall's value. */ +L(pseudo_end): + ret + + +#if defined NEED_CANCELLATION && defined CENABLE + /* We need one more register. */ +1: pushl %esi + cfi_adjust_cfa_offset(4) + + /* Enable asynchronous cancellation. */ + CENABLE + movl %eax, %esi + cfi_offset(6, -8) /* %esi */ + + /* Save registers. */ + movl %ebx, %edx + cfi_register (3, 2) + + movl $SYS_ify(socketcall), %eax /* System call number in %eax. */ + + /* Use ## so `socket' is a separate token that might be #define'd. */ + movl $P(SOCKOP_,socket), %ebx /* Subcode is first arg to syscall. */ + lea 8(%esp), %ecx /* Address of args is 2nd arg. */ + + /* Do the system call trap. */ + ENTER_KERNEL + + /* Restore registers. */ + movl %edx, %ebx + cfi_restore (3) + + /* Restore the cancellation. */ + xchgl %esi, %eax + CDISABLE + + /* Restore registers. */ + movl %esi, %eax + popl %esi + cfi_restore (6) + cfi_adjust_cfa_offset(-4) + + /* %eax is < 0 if there was an error. */ + cmpl $-125, %eax + jae SYSCALL_ERROR_LABEL + + /* Successful; return the syscall's value. */ + ret +#endif +PSEUDO_END (__socket) + +#ifndef NO_WEAK_ALIAS +weak_alias (__socket, socket) +#endif |