mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-27 03:41:23 +08:00
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* Assembler macros for i386.
|
|
Copyright (C) 1991, 92, 93, 95, 96 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., 675 Mass Ave,
|
|
Cambridge, MA 02139, 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;
|
|
|
|
/* 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. */
|
|
|
|
#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(4); \
|
|
C_LABEL(name) \
|
|
CALL_MCOUNT
|
|
|
|
/* If compiled for profiling, call `mcount' at the start of each function. */
|
|
#ifdef PROF
|
|
/* The mcount code relies on a normal frame pointer being on the stack
|
|
to locate our caller, so push one just for its benefit. */
|
|
#define CALL_MCOUNT \
|
|
pushl %ebp; movl %esp, %ebp; call JUMPTARGET(mcount); popl %ebp;
|
|
#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 \
|
|
jmp JUMPTARGET(syscall_error) \
|
|
.globl syscall_error; \
|
|
ENTRY (name) \
|
|
DO_CALL (syscall_name, args); \
|
|
jb lose
|
|
|
|
#ifdef PIC
|
|
#define JUMPTARGET(name) name##@PLT
|
|
#define SYSCALL_PIC_SETUP \
|
|
pushl %ebx; \
|
|
call 0f; \
|
|
0: popl %ebx; \
|
|
addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx;
|
|
#else
|
|
#define JUMPTARGET(name) name
|
|
#define SYSCALL_PIC_SETUP /* Nothing. */
|
|
#endif
|
|
|
|
#endif /* ASSEMBLER */
|