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95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/* Assembler macros for 64 bit S/390.
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Copyright (C) 2001-2016 Free Software Foundation, Inc.
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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 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, see
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<http://www.gnu.org/licenses/>. */
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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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/* 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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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
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/* Define an entry point visible from C. */
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#define ENTRY(name) \
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.globl C_SYMBOL_NAME(name); \
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.type C_SYMBOL_NAME(name),@function; \
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.align ALIGNARG(2); \
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C_LABEL(name) \
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cfi_startproc; \
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CALL_MCOUNT
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#undef END
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#define END(name) \
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cfi_endproc; \
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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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lgr 0,14 ; larl 1,0f ; brasl 14,_mcount@PLT ; lgr 14,0 ; \
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.data ; .align 4 ; 0: .long 0 ; .text ;
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#else
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#define CALL_MCOUNT \
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lgr 0,14 ; larl 1,0f ; brasl 14,_mcount ; lgr 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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/* 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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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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lose: SYSCALL_PIC_SETUP \
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jg 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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#undef JUMPTARGET
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#ifdef PIC
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#define JUMPTARGET(name) name##@PLT
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#define SYSCALL_PIC_SETUP \
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larl %r12,_GLOBAL_OFFSET_TABLE_
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#else
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#define JUMPTARGET(name) name
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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) .L##name
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#endif
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#endif /* __ASSEMBLER__ */
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