diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/socket.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/socket.S | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/socket.S b/sysdeps/unix/sysv/linux/arm/socket.S new file mode 100644 index 0000000000..212a489afe --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/socket.S @@ -0,0 +1,123 @@ +/* Copyright (C) 1995, 1996, 1997, 1998, 2003 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> + +#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 +#define __socket P(__,socket) +#endif + +#define PUSHARGS_1 str a1, [sp, $-4]! +#define PUSHARGS_2 stmfd sp!, {a1, a2} +#define PUSHARGS_3 stmfd sp!, {a1, a2, a3} +#define PUSHARGS_4 stmfd sp!, {a1, a2, a3, a4} +#define PUSHARGS_5 stmfd sp!, {a1, a2, a3, a4} /* Caller has already pushed arg 5 */ +#define PUSHARGS_6 stmfd sp!, {a1, a2, a3, a4} + +#define POPARGS_1 add sp, sp, #4 +#define POPARGS_2 add sp, sp, #8 +#define POPARGS_3 add sp, sp, #12 +#define POPARGS_4 add sp, sp, #16 +#define POPARGS_5 add sp, sp, #16 +#define POPARGS_6 add sp, sp, #16 + +#ifndef NARGS +#define NARGS 3 /* If we were called with no wrapper, this is really socket() */ +#endif + +#if defined NEED_CANCELLATION && defined CENABLE + PSEUDO_PROLOGUE +#endif + +.globl __socket +ENTRY (__socket) + /* This code previously moved sp into ip and stored the args using + stmdb ip!, {a1-a4}. It did not modify sp, so the stack never had + to be restored after the syscall completed. It saved an + instruction and meant no stack cleanup work was required. + + This will not work in the case of a socket call being interrupted + by a signal. If the signal handler uses any stack the arguments + to socket will be trashed. The results of a restart of any + socket call are then unpredictable. */ + + /* Push args onto the stack. */ + P(PUSHARGS_,NARGS) + +#if defined NEED_CANCELLATION && defined CENABLE +#ifdef PIC + SINGLE_THREAD_P_PIC(r3) +#else + SINGLE_THREAD_P +#endif + bne 1f +#endif + + /* Do the system call trap. */ + mov a1, $P(SOCKOP_,socket) + mov a2, sp + swi SYS_ify(socketcall) + + /* Pop args off the stack */ + P(POPARGS_,NARGS) + + /* r0 is < 0 if there was an error. */ + cmn r0, $124 + RETINSTR(cc, r14) + b PLTJMP(SYSCALL_ERROR) + +#if defined NEED_CANCELLATION && defined CENABLE +1: + str lr, [sp, #-4]! + CENABLE + mov ip, r0 + + mov r0, #P(SOCKOP_,socket) + add r1, sp, #4 + swi SYS_ify(socketcall) + + str r0, [sp, #-4]! + mov r0, ip + CDISABLE + ldr r0, [sp], #4 + ldr lr, [sp], #4 + + P(POPARGS_,NARGS) + + /* r0 is < 0 if there was an error. */ + cmn r0, $124 + RETINSTR(cc, r14) + b PLTJMP(SYSCALL_ERROR) +#endif + +PSEUDO_END (__socket) + +weak_alias (__socket, socket) |