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