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100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
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/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999.
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Based on code originally written by David Mosberger-Tang
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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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#include <sysdeps/unix/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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#ifdef __STDC__
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# define SYS_ify(syscall_name) __NR_##syscall_name
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#else
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# define SYS_ify(syscall_name) __NR_/**/syscall_name
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#endif
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#ifdef __ASSEMBLER__
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/* Linux uses a negative return value to indicate syscall errors, unlike
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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 negative
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even if the call succeeded. E.g., the `lseek' system call might return
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a large offset. Therefore we must not anymore test for < 0, but test
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for a real error by making sure the value in %d0 is a real error
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number. Linus said he will make sure the no syscall returns a value
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in -1 .. -4095 as a valid result so we can savely test with -4095. */
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/* We don't want the label for the error handler to be visible in the symbol
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table when we define it here. */
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#define SYSCALL_ERROR_LABEL __syscall_error
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#ifdef PROF
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#error "define CALL_MCOUNT"
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#else
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#define CALL_MCOUNT
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#endif
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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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ENTRY(name) \
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DO_CALL (SYS_ify(syscall_name)); \
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cmp.eq p6,p0=-1,r10;; \
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(p6) br.cond.spnt.few __syscall_error;
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#define ENTRY(name) \
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.psr abi64; \
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.psr lsb; \
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.lsb; \
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.proc C_SYMBOL_NAME(name); \
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.text; \
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.align 32; \
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.proc C_SYMBOL_NAME(name); \
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.global C_SYMBOL_NAME(name); \
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C_LABEL(name) \
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CALL_MCOUNT
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#define DO_CALL(num) \
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mov r15=num; \
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break __BREAK_SYSCALL;
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#undef PSEUDO_END
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#define PSEUDO_END(name) .endp C_SYMBOL_NAME(name);
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#undef END
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#define END(name) \
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.size C_SYMBOL_NAME(name), . - C_SYMBOL_NAME(name) ; \
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.endp C_SYMBOL_NAME(name)
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#define ret br.ret.sptk.few b0
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#else /* not __ASSEMBLER__ */
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/* Define a macro which expands into the inline wrapper code for a system
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call. */
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#if 0
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) __##name (args)
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#endif
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#endif /* not __ASSEMBLER__ */
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