115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/* Assembler macros for CRIS.
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Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdeps/generic/sysdep.h>
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#ifndef HAVE_ELF
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# error ELF is assumed. Generalize the code and retry.
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#endif
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#ifndef NO_UNDERSCORES
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# error User-label prefix (underscore) assumed absent. Generalize the code and retry.
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#endif
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#ifdef __ASSEMBLER__
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/* Syntactic details of assembly-code. */
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/* It is *not* generally true that "ELF uses byte-counts for .align, most
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others use log2 of count of bytes", like some neighboring configs say.
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See "align" in gas/read.c which is not overridden by
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gas/config/obj-elf.c. It takes a log2 argument. *Some* targets
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override it to take a byte argument. People should read source instead
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of relying on hearsay. */
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# define ALIGNARG(log2) log2
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# define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
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# define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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/* The non-PIC jump is preferred, since it does not stall, and does not
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invoke generation of a PLT. These macros assume that $r0 is set up as
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GOT register. */
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# ifdef __PIC__
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# define PLTJUMP(_x) \
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add.d C_SYMBOL_NAME (_x):PLT,$pc
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# define PLTCALL(_x) \
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move.d C_SYMBOL_NAME (_x):PLTG,$r9 @ \
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add.d $r0,$r9 @ \
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jsr $r9
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# define SETUP_PIC \
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push $r0 @ \
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move.d $pc,$r0 @ \
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sub.d .:GOTOFF,$r0
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# define TEARDOWN_PIC pop $r0
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# else
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# define PLTJUMP(_x) jump C_SYMBOL_NAME (_x)
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# define PLTCALL(_x) jsr C_SYMBOL_NAME (_x)
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# define SETUP_PIC
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# define TEARDOWN_PIC
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# endif
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/* Define an entry point visible from C. */
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# define ENTRY(name) \
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.text @ \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (name) @ \
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ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME (name), function) @ \
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.align ALIGNARG (2) @ \
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C_LABEL(name) @ \
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CALL_MCOUNT
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# undef END
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# define END(name) \
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ASM_SIZE_DIRECTIVE (C_SYMBOL_NAME (name))
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/* If compiled for profiling, call `mcount' at the start of each function.
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FIXME: Note that profiling is not actually implemented. This is just
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example code which might not even compile, though it is believed to be
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correct. */
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# ifdef PROF
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# define CALL_MCOUNT \
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push $srp @ \
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push $r9 @ \
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push $r10 @ \
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push $r11 @ \
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push $r12 @ \
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push $r13 @ \
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SETUP_PIC @ \
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PLTCALL (mcount) @ \
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TEARDOWN_PIC @ \
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pop $r13 @ \
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pop $r12 @ \
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pop $r11 @ \
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pop $r10 @ \
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pop $r9 @ \
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pop $srp
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# else
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# define CALL_MCOUNT /* Do nothing. */
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# endif
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/* Since C identifiers are not normally prefixed with an underscore
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on this system, the asm identifier `syscall_error' intrudes on the
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C name space. Make sure we use an innocuous name. */
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# define syscall_error __syscall_error
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# define mcount _mcount
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#endif /* __ASSEMBLER__ */
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