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/* Assembler macros for CRIS.
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 _SYSDEP_H_
#define _SYSDEP_H_
#ifndef C_LABEL
/* Define a macro we can use to construct the asm name for a C symbol. */
#ifdef __STDC__
#define C_LABEL(name) name##:
#else
#define C_LABEL(name) name/**/:
#endif
#endif /* C_LABEL */
#define __STR(x) #x
#define STR(x) __STR(x)
/* Mark the end of function named SYM. This is used on some platforms
to generate correct debugging information. */
#ifndef END
#define END(sym)
#endif
#define C_SYMBOL_NAME(name) name
#ifdef __ASSEMBLER__
/* Syntactic details of assembly-code. */
/* It is *not* generally true that "ELF uses byte-counts for .align, most
others use log2 of count of bytes", like some neighboring configs say.
See "align" in gas/read.c which is not overridden by
gas/config/obj-elf.c. It takes a log2 argument. *Some* targets
override it to take a byte argument. People should read source instead
of relying on hearsay. */
#define ALIGNARG(log2) log2
#define ASM_GLOBAL_DIRECTIVE .globl
#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
/* The non-PIC jump is preferred, since it does not stall, and does not
invoke generation of a PLT. These macros assume that $r0 is set up as
GOT register. */
#ifdef __PIC__
#define PLTJUMP(_x) \
add.d C_SYMBOL_NAME (_x):PLT,$pc
#define PLTCALL(_x) \
jsr [$r0+C_SYMBOL_NAME (_x):GOTPLT16]
#define SETUP_PIC \
push $r0 @ \
move.d $pc,$r0 @ \
sub.d .:GOTOFF,$r0
#define TEARDOWN_PIC pop $r0
#else
#define PLTJUMP(_x) jump C_SYMBOL_NAME (_x)
#define PLTCALL(_x) jsr C_SYMBOL_NAME (_x)
#define SETUP_PIC
#define TEARDOWN_PIC
#endif
/* Define an entry point visible from C. */
#define ENTRY(name) \
.text @ \
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (name) @ \
ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME (name), function) @ \
.align ALIGNARG (2) @ \
C_LABEL(name) @ \
CALL_MCOUNT
#undef END
#define END(name) \
ASM_SIZE_DIRECTIVE (C_SYMBOL_NAME (name))
#define PSEUDO(name, syscall_name, args) \
ENTRY (name) @ \
DOARGS_##args @ \
movu.w SYS_ify (syscall_name),$r9 @ \
break 13 @ \
cmps.w -4096,$r10 @ \
bhs 0f @ \
nop @ \
UNDOARGS_return_##args
#define PSEUDO_END(name) \
0: @ \
SETUP_PIC @ \
PLTJUMP (syscall_error) @ \
END (name)
/* If compiled for profiling, call `mcount' at the start of each function.
FIXME: Note that profiling is not actually implemented. This is just
example code which might not even compile, though it is believed to be
correct. */
#ifdef PROF
#define CALL_MCOUNT \
push $srp @ \
push $r9 @ \
push $r10 @ \
push $r11 @ \
push $r12 @ \
push $r13 @ \
SETUP_PIC @ \
PLTCALL (mcount) @ \
TEARDOWN_PIC @ \
pop $r13 @ \
pop $r12 @ \
pop $r11 @ \
pop $r10 @ \
pop $r9 @ \
pop $srp
#else
#define CALL_MCOUNT /* Do nothing. */
#endif
/* Since C identifiers are not normally prefixed with an underscore
on this system, the asm identifier `syscall_error' intrudes on the
C name space. Make sure we use an innocuous name. */
#define syscall_error __syscall_error
#define mcount _mcount
#endif /* __ASSEMBLER__ */
#endif /* _SYSDEP_H_ */
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