mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
a64e578b6f
1999-04-12 Philip Blundell <philb@gnu.org> * elf/elf.h: Update ARM definitions to match current gas2. * sysdeps/arm/bits/endian.h: Support big endian operation. * sysdeps/unix/sysv/linux/arm/ioperm.c (_outw, _outb, _outl): Don't bother range checking the port number. * sysdeps/unix/sysv/linux/arm/vfork.S: New file. * sysdeps/unix/sysv/linux/arm/sysdep.h (INLINE_SYSCALL): Include the syscall name in assembler output for ease of debugging. * sysdeps/unix/sysv/linux/arm/sigaction.c: Don't rely on undefined compiler behaviour. * sysdeps/unix/sysv/linux/arm/sigrestorer.S: New file. * sysdeps/unix/sysv/linux/arm/Makefile [$(subdir) = signal] (sysdep_routines): Add sigrestorer. * string/tester.c (test_strcpy): Add new tests for unaligned arguments. * sysdeps/arm/bits/string.h: Delete inline implementations of strcpy and stpcpy.
156 lines
5.0 KiB
C
156 lines
5.0 KiB
C
/* Copyright (C) 1992, 93, 95, 96, 97, 98 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
|
|
ARM changes by Philip Blundell, <pjb27@cam.ac.uk>, May 1997.
|
|
|
|
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., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#ifndef _LINUX_ARM_SYSDEP_H
|
|
#define _LINUX_ARM_SYSDEP_H 1
|
|
|
|
/* There is some commonality. */
|
|
#include <sysdeps/unix/arm/sysdep.h>
|
|
|
|
/* For Linux we can use the system call table in the header file
|
|
/usr/include/asm/unistd.h
|
|
of the kernel. But these symbols do not follow the SYS_* syntax
|
|
so we have to redefine the `SYS_ify' macro here. */
|
|
#undef SYS_ify
|
|
#define SWI_BASE (0x900000)
|
|
#define SYS_ify(syscall_name) (__NR_##syscall_name)
|
|
|
|
|
|
#ifdef __ASSEMBLER__
|
|
|
|
/* Linux uses a negative return value to indicate syscall errors,
|
|
unlike most Unices, which use the condition codes' carry flag.
|
|
|
|
Since version 2.1 the return value of a system call might be
|
|
negative even if the call succeeded. E.g., the `lseek' system call
|
|
might return a large offset. Therefore we must not anymore test
|
|
for < 0, but test for a real error by making sure the value in R0
|
|
is a real error number. Linus said he will make sure the no syscall
|
|
returns a value in -1 .. -4095 as a valid result so we can savely
|
|
test with -4095. */
|
|
|
|
#undef PSEUDO
|
|
#define PSEUDO(name, syscall_name, args) \
|
|
.text; \
|
|
.type syscall_error,%function; \
|
|
ENTRY (name); \
|
|
DO_CALL (args, syscall_name); \
|
|
cmn r0, $4096; \
|
|
bhs PLTJMP(C_SYMBOL_NAME(__syscall_error));
|
|
|
|
#undef PSEUDO_END
|
|
#define PSEUDO_END(name) \
|
|
SYSCALL_ERROR_HANDLER \
|
|
END (name)
|
|
|
|
#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
|
|
|
|
/* Linux takes system call args in registers:
|
|
syscall number in the SWI instruction
|
|
arg 1 r0
|
|
arg 2 r1
|
|
arg 3 r2
|
|
arg 4 r3
|
|
arg 5 r4 (this is different from the APCS convention)
|
|
|
|
The compiler is going to form a call by coming here, through PSEUDO, with
|
|
arguments
|
|
syscall number in the DO_CALL macro
|
|
arg 1 r0
|
|
arg 2 r1
|
|
arg 3 r2
|
|
arg 4 r3
|
|
arg 5 [sp]
|
|
|
|
We need to shuffle values between R4 and the stack so that the caller's
|
|
R4 is not corrupted, and the kernel sees the right argument there.
|
|
|
|
*/
|
|
|
|
#undef DO_CALL
|
|
#define DO_CALL(args, syscall_name) \
|
|
DOARGS_##args \
|
|
swi SYS_ify (syscall_name); \
|
|
UNDOARGS_##args
|
|
|
|
#define DOARGS_0 /* nothing */
|
|
#define DOARGS_1 /* nothing */
|
|
#define DOARGS_2 /* nothing */
|
|
#define DOARGS_3 /* nothing */
|
|
#define DOARGS_4 /* nothing */
|
|
#define DOARGS_5 ldr ip, [sp]; str r4, [sp]; mov r4, ip;
|
|
|
|
#define UNDOARGS_0 /* nothing */
|
|
#define UNDOARGS_1 /* nothing */
|
|
#define UNDOARGS_2 /* nothing */
|
|
#define UNDOARGS_3 /* nothing */
|
|
#define UNDOARGS_4 /* nothing */
|
|
#define UNDOARGS_5 ldr r4, [sp];
|
|
|
|
#else /* not __ASSEMBLER__ */
|
|
|
|
/* Define a macro which expands into the inline wrapper code for a system
|
|
call. */
|
|
#undef INLINE_SYSCALL
|
|
#define INLINE_SYSCALL(name, nr, args...) \
|
|
({ unsigned int _sys_result; \
|
|
{ \
|
|
register int _a1 asm ("a1"); \
|
|
LOAD_ARGS_##nr (args) \
|
|
asm volatile ("swi %1 @ syscall " #name \
|
|
: "=r" (_a1) \
|
|
: "i" (SYS_ify(name)) ASM_ARGS_##nr \
|
|
: "a1"); \
|
|
_sys_result = _a1; \
|
|
} \
|
|
if (_sys_result >= (unsigned int) -4095) \
|
|
{ \
|
|
__set_errno (-_sys_result); \
|
|
_sys_result = (unsigned int) -1; \
|
|
} \
|
|
(int) _sys_result; })
|
|
|
|
#define LOAD_ARGS_0()
|
|
#define ASM_ARGS_0
|
|
#define LOAD_ARGS_1(a1) \
|
|
_a1 = (int) (a1); \
|
|
LOAD_ARGS_0 ()
|
|
#define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1)
|
|
#define LOAD_ARGS_2(a1, a2) \
|
|
register int _a2 asm ("a2") = (int) (a2); \
|
|
LOAD_ARGS_1 (a1)
|
|
#define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2)
|
|
#define LOAD_ARGS_3(a1, a2, a3) \
|
|
register int _a3 asm ("a3") = (int) (a3); \
|
|
LOAD_ARGS_2 (a1, a2)
|
|
#define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3)
|
|
#define LOAD_ARGS_4(a1, a2, a3, a4) \
|
|
register int _a4 asm ("a4") = (int) (a4); \
|
|
LOAD_ARGS_3 (a1, a2, a3)
|
|
#define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4)
|
|
#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
|
|
register int _v1 asm ("v1") = (int) (a5); \
|
|
LOAD_ARGS_4 (a1, a2, a3, a4)
|
|
#define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1)
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#endif /* linux/arm/sysdep.h */
|