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/* Copyright (C) 1999, 2000 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. */
#include <sysdeps/unix/sysdep.h>
#include <sysdeps/ia64/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
#ifdef __STDC__
# define SYS_ify(syscall_name) __NR_##syscall_name
#else
# define SYS_ify(syscall_name) __NR_/**/syscall_name
#endif
#ifdef __ASSEMBLER__
#undef CALL_MCOUNT
#ifdef PROF
# define CALL_MCOUNT \
.data; \
1: data8 0; /* XXX fixme: use .xdata8 once labels work */ \
.previous; \
.prologue; \
.save ar.pfs, r40; \
alloc out0 = ar.pfs, 8, 0, 4, 0; \
mov out1 = gp; \
.save rp, out2; \
mov out2 = rp; \
.body; \
;; \
addl out3 = @ltoff(1b), gp; \
br.call.sptk.many rp = _mcount \
;;
#else
# define CALL_MCOUNT /* Do nothing. */
#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(num) \
mov r15=num; \
break __BREAK_SYSCALL;
#undef PSEUDO_END
#define PSEUDO_END(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
#else /* not __ASSEMBLER__ */
/* Define a macro which expands into the inline wrapper code for a system
call. */
#if 0
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) __##name (args)
#endif
#endif /* not __ASSEMBLER__ */
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