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/* Copyright (C) 1992, 93, 95-99, 2000 Free Software Foundation,
Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>.
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_SH_SYSDEP_H
#define _LINUX_SH_SYSDEP_H 1
/* There is some commonality. */
#include <sysdeps/unix/sh/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 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. */
#define _IMM12 #-12
#undef PSEUDO
#ifdef SHARED
#define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name); \
DO_CALL (args, syscall_name); \
mov r0,r1; \
mov _IMM12,r2; \
shad r2,r1; \
not r1,r1; \
tst r1,r1; \
bf 1f; \
mov r0,r4; \
mov.l r12,@-r15; \
sts.l pr,@-r15; \
mov.l 0f,r12; \
mova 0f,r0; \
add r0,r12; \
mov.l 2f,r1; \
mova 2f,r0; \
add r0,r1; \
jsr @r1; \
nop; \
lds.l @r15+,pr; \
rts; \
mov.l @r15+,r12; \
.align 2; \
2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \
0: .long _GLOBAL_OFFSET_TABLE_; \
1:
#else
#define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name); \
DO_CALL (args, syscall_name); \
mov r0,r1; \
mov _IMM12,r2; \
shad r2,r1; \
not r1,r1; \
tst r1,r1; \
bf 1f; \
mov.l 2f,r1; \
jmp @r1; \
mov r0, r4; \
.align 2; \
2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \
1:
#endif
#undef PSEUDO_END
#define PSEUDO_END(name) \
SYSCALL_ERROR_HANDLER \
END (name)
#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
#define SYSCALL_INST0 trapa #0
#define SYSCALL_INST1 trapa #0
#define SYSCALL_INST2 trapa #0
#define SYSCALL_INST3 trapa #0
#define SYSCALL_INST4 trapa #0
#define SYSCALL_INST5 trapa #1
#define SYSCALL_INST6 trapa #2
#undef DO_CALL
#define DO_CALL(args, syscall_name) \
mov.l 1f,r0; \
SYSCALL_INST##args; \
bra 2f; \
nop; \
.align 2; \
1: .long SYS_ify(syscall_name); \
2:
#else /* not __ASSEMBLER__ */
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
__syscall_##name(args)
#endif /* __ASSEMBLER__ */
#endif /* linux/sh/sysdep.h */
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