2000-08-02 15:15:00 +00:00
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/* Assembler macros for s390.
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2001-03-16 09:57:45 +00:00
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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2000-08-02 15:15:00 +00:00
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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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 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/generic/sysdep.h>
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#ifdef __ASSEMBLER__
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/* Syntactic details of assembler. */
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#ifdef HAVE_ELF
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/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
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#define ALIGNARG(log2) 1<<log2
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/* For ELF we need the `.type' directive to make shared libs work right. */
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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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/* In ELF C symbols are asm symbols. */
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#undef NO_UNDERSCORES
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#define NO_UNDERSCORES
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#else
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#define ALIGNARG(log2) log2
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#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
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#define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */
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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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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(name) \
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/* If compiled for profiling, call `mcount' at the start of each function. */
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#ifdef PROF
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#ifdef PIC
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#define CALL_MCOUNT \
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lr 0,14 ; bras 14,.+12 ; .long _GLOBAL_OFFSET_TABLE_ - . ; .long 0f-. ; \
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lr 1,14 ; al 1,4(14) ; al 14,0(14) ; l 14,_mcount@GOT(14) ; \
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basr 14,14 ; lr 14,0 ; .data ; .align 4 ; 0: .long 0 ; .text ;
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#else
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#define CALL_MCOUNT \
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lr 0,14 ; bras 14,.+12 ; .long _mcount ; .long 0f ; \
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l 1,4(14) ; l 14,0(14) ; basr 14,14 ; lr 14,0 ; \
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.data ; .align 4 ; 0: .long 0 ; .text ;
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#endif
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#else
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#define CALL_MCOUNT /* Do nothing. */
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#endif
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#ifdef NO_UNDERSCORES
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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
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#define PSEUDO(name, syscall_name, args) \
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lose: SYSCALL_PIC_SETUP \
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JUMPTARGET(syscall_error) \
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.globl syscall_error; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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jm lose
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END (name)
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#ifdef PIC
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#define JUMPTARGET(name) \
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basr %r1,0 \
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0: al %r1,1f-0b(0,%r1) \
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br %r1 \
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1: .long name##@PLT - 0b
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#define SYSCALL_PIC_SETUP \
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bras %r12,1f \
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0: .long _GLOBAL_OFFSET_TABLE_-0b \
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1: al %r12,0(%r12)
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#else
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#define JUMPTARGET(name) \
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basr %r1,0 \
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0: al %r1,1f-0b(0,%r1) \
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br %r1 \
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1: .long name - 0b
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#define SYSCALL_PIC_SETUP /* Nothing. */
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#endif
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/* Local label name for asm code. */
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#ifndef L
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#define L(name) name
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#endif
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#endif /* __ASSEMBLER__ */
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