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/* Copyright (C) 1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written by Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999.
Based on code originally written by David Mosberger-Tang
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. */
#ifndef _LINUX_IA64_SYSDEP_H
#define _LINUX_IA64_SYSDEP_H 1
#include <features.h>
#include <asm/unistd.h>
#ifdef __ASSEMBLER__
/* Macros to help writing .prologue directives in assembly code. */
#define ASM_UNW_PRLG_RP 0x8
#define ASM_UNW_PRLG_PFS 0x4
#define ASM_UNW_PRLG_PSP 0x2
#define ASM_UNW_PRLG_PR 0x1
#define ASM_UNW_PRLG_GRSAVE(ninputs) (32+(ninputs))
#ifdef __STDC__
#define C_LABEL(name) name :
#else
#define C_LABEL(name) name/**/:
#endif
#define CALL_MCOUNT
#define ENTRY(name) \
.text; \
.align 32; \
.proc C_SYMBOL_NAME(name); \
.global C_SYMBOL_NAME(name); \
C_LABEL(name) \
CALL_MCOUNT
#define HIDDEN_ENTRY(name) \
.text; \
.align 32; \
.proc C_SYMBOL_NAME(name); \
.global C_SYMBOL_NAME(name); \
.hidden C_SYMBOL_NAME(name); \
C_LABEL(name) \
CALL_MCOUNT
#define LEAF(name) \
.text; \
.align 32; \
.proc C_SYMBOL_NAME(name); \
.global name; \
C_LABEL(name)
/* Mark the end of function SYM. */
#undef END
#define END(sym) .endp C_SYMBOL_NAME(sym)
/* 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
#ifdef __STDC__
# define SYS_ify(syscall_name) __NR_##syscall_name
#else
# define SYS_ify(syscall_name) __NR_/**/syscall_name
#endif
/* 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 %d0 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. */
/* We don't want the label for the error handler to be visible in the symbol
table when we define it here. */
#define SYSCALL_ERROR_LABEL __syscall_error
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
ENTRY(name) \
DO_CALL (SYS_ify(syscall_name)); \
cmp.eq p6,p0=-1,r10; \
(p6) br.cond.spnt.few __syscall_error;
#define DO_CALL_VIA_BREAK(num) \
mov r15=num; \
break __BREAK_SYSCALL
#ifdef IA64_USE_NEW_STUB
# ifdef SHARED
# define DO_CALL(num) \
.prologue; \
adds r2 = SYSINFO_OFFSET, r13;; \
ld8 r2 = [r2]; \
.save ar.pfs, r11; \
mov r11 = ar.pfs;; \
.body; \
mov r15 = num; \
mov b7 = r2; \
br.call.sptk.many b6 = b7;; \
.restore sp; \
mov ar.pfs = r11; \
.prologue; \
.body
# else /* !SHARED */
# define DO_CALL(num) \
.prologue; \
mov r15 = num; \
movl r2 = _dl_sysinfo;; \
ld8 r2 = [r2]; \
.save ar.pfs, r11; \
mov r11 = ar.pfs;; \
.body; \
mov b7 = r2; \
br.call.sptk.many b6 = b7;; \
.restore sp; \
mov ar.pfs = r11; \
.prologue; \
.body
# endif
#else
# define DO_CALL(num) DO_CALL_VIA_BREAK(num)
#endif
#undef PSEUDO_END
#define PSEUDO_END(name) .endp C_SYMBOL_NAME(name);
#undef PSEUDO_NOERRNO
#define PSEUDO_NOERRNO(name, syscall_name, args) \
ENTRY(name) \
DO_CALL (SYS_ify(syscall_name));
#undef PSEUDO_END_NOERRNO
#define PSEUDO_END_NOERRNO(name) .endp C_SYMBOL_NAME(name);
#undef PSEUDO_ERRVAL
#define PSEUDO_ERRVAL(name, syscall_name, args) \
ENTRY(name) \
DO_CALL (SYS_ify(syscall_name)); \
cmp.eq p6,p0=-1,r10; \
(p6) mov r10=r8;
#undef PSEUDO_END_ERRVAL
#define PSEUDO_END_ERRVAL(name) .endp C_SYMBOL_NAME(name);
#undef END
#define END(name) \
.size C_SYMBOL_NAME(name), . - C_SYMBOL_NAME(name) ; \
.endp C_SYMBOL_NAME(name)
#define ret br.ret.sptk.few b0
#define ret_NOERRNO ret
#define ret_ERRVAL ret
#endif /* not __ASSEMBLER__ */
#endif /* linux/ia64/sysdep.h */
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