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Linux/ARM specific implementation
This commit is contained in:
Ulrich Drepper
parent
bd85bd7500
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33
sysdeps/unix/sysv/linux/arm/clone.S
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33
sysdeps/unix/sysv/linux/arm/clone.S
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/* Copyright (C) 1996, 1997 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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <errnos.h>
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
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.text
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ENTRY(__clone)
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/* Somebody needs to write this. */
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PSEUDO_END (__clone)
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weak_alias (__clone, clone)
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49
sysdeps/unix/sysv/linux/arm/socket.S
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49
sysdeps/unix/sysv/linux/arm/socket.S
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/* Copyright (C) 1995, 1996, 1997 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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include <sys/socketcall.h>
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#define P(a, b) P2(a, b)
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#define P2(a, b) a##b
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.text
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/* The socket-oriented system calls are handled unusally in Linux.
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They are all gated through the single `socketcall' system call number.
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`socketcall' takes two arguments: the first is the subcode, specifying
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which socket function is being called; and the second is a pointer to
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the arguments to the specific function.
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The .S files for the other calls just #define socket and #include this. */
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.globl P(__,socket)
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ENTRY (P(__,socket))
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/* Do the system call trap. */
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swi SYS_ify(socketcall)
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/* %eax is < 0 if there was an error. */
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cmn r0, $124
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bge syscall_error
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/* Successful; return the syscall's value. */
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RETINSTR(mov,pc,r14)
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PSEUDO_END (P(__,socket))
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weak_alias (P(__,socket), socket)
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47
sysdeps/unix/sysv/linux/arm/syscall.S
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47
sysdeps/unix/sysv/linux/arm/syscall.S
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/* Copyright (C) 1995, 1996 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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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/* Please consult the file sysdeps/unix/sysv/linux/arm/sysdep.h for
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more information about the value -4095 used below.*/
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.text
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ENTRY (syscall)
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/* Normally encoding the system call number in the instruction is
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good. But we pay the price here. */
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sub sp, sp, $0xc @ get 3 words on the stack
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orr r0, r0, $0xef000000 @ make up a SWI instruction
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orr r0, r0, $SWI_BASE
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str r0, [sp]
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ldr r0, _reti
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str r0, [sp, $4]
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adr r0, _ret
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str r0, [sp, $8]
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mov r0, r1
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mov r1, r2
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mov r2, r3
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mov pc, sp
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_ret: add sp, sp, $0xc
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RETINSTR(mov, pc, r14)
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_reti: .word 0xe51ff004 @ ldr pc, [pc, $4]
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PSEUDO_END (syscall)
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73
sysdeps/unix/sysv/linux/arm/sysdep.h
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73
sysdeps/unix/sysv/linux/arm/sysdep.h
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/* Copyright (C) 1992, 93, 95, 96, 97 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
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ARM changes by Philip Blundell, <pjb27@cam.ac.uk>, May 1997.
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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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#ifndef _LINUX_ARM_SYSDEP_H
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#define _LINUX_ARM_SYSDEP_H 1
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/* There is some commonality. */
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#include <sysdeps/unix/arm/sysdep.h>
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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so we have to redefine the `SYS_ify' macro here. */
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#undef SYS_ify
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#define SWI_BASE (9 << 20)
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#define SYS_ify(syscall_name) (SWI_BASE + __NR_##syscall_name)
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#ifdef ASSEMBLER
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/* Linux uses a negative return value to indicate syscall errors,
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unlike most Unices, which use the condition codes' carry flag.
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Since version 2.1 the return value of a system call might be
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negative even if the call succeeded. E.g., the `lseek' system call
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might return a large offset. Therefore we must not anymore test
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for < 0, but test for a real error by making sure the value in %eax
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is a real error number. Linus said he will make sure the no syscall
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returns a value in -1 .. -4095 as a valid result so we can savely
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test with -4095. */
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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (args, syscall_name); \
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cmn r0, $4096; \
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bge syscall_error;
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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SYSCALL_ERROR_HANDLER \
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END (name)
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#ifndef PIC
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#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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#else
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#error Aiee
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#endif /* PIC */
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#undef DO_CALL
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#define DO_CALL(args, syscall_name) \
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swi SYS_ify (syscall_name);
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#endif /* ASSEMBLER */
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#endif /* linux/arm/sysdep.h */
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