mirror of git://sourceware.org/git/glibc.git
133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/* Copyright (C) 1992, 93, 95-99, 2000 Free Software Foundation,
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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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Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>.
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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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#ifndef _LINUX_SH_SYSDEP_H
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#define _LINUX_SH_SYSDEP_H 1
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/* There is some commonality. */
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#include <sysdeps/unix/sh/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 SYS_ify(syscall_name) (__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 R0
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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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#define _IMM12 #-12
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#undef PSEUDO
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#ifdef SHARED
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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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mov r0,r1; \
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mov _IMM12,r2; \
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shad r2,r1; \
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not r1,r1; \
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tst r1,r1; \
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bf 1f; \
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mov r0,r4; \
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mov.l r12,@-r15; \
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sts.l pr,@-r15; \
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mov.l 0f,r12; \
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mova 0f,r0; \
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add r0,r12; \
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mov.l 2f,r1; \
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mova 2f,r0; \
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add r0,r1; \
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jsr @r1; \
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nop; \
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lds.l @r15+,pr; \
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rts; \
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mov.l @r15+,r12; \
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.align 2; \
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2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \
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0: .long _GLOBAL_OFFSET_TABLE_; \
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1:
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#else
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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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mov r0,r1; \
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mov _IMM12,r2; \
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shad r2,r1; \
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not r1,r1; \
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tst r1,r1; \
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bf 1f; \
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mov.l 2f,r1; \
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jmp @r1; \
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mov r0, r4; \
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.align 2; \
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2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \
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1:
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#endif
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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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#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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#define SYSCALL_INST0 trapa #0
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#define SYSCALL_INST1 trapa #0
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#define SYSCALL_INST2 trapa #0
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#define SYSCALL_INST3 trapa #0
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#define SYSCALL_INST4 trapa #0
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#define SYSCALL_INST5 trapa #1
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#define SYSCALL_INST6 trapa #2
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#undef DO_CALL
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#define DO_CALL(args, syscall_name) \
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mov.l 1f,r0; \
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SYSCALL_INST##args; \
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bra 2f; \
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nop; \
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.align 2; \
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1: .long SYS_ify(syscall_name); \
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2:
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#else /* not __ASSEMBLER__ */
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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__syscall_##name(args)
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#endif /* __ASSEMBLER__ */
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#endif /* linux/sh/sysdep.h */
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