Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/i386/sysdep.h
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
175 lines (148 sloc)
5.56 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Assembler macros for i386. | |
Copyright (C) 1991-93,95,96,98,2002,2003,2005 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 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. | |
There is currently a bug in gdb which prevents us from specifying | |
incomplete stabs information. Fake some entries here which specify | |
the current source file. */ | |
#define ENTRY(name) \ | |
STABS_CURRENT_FILE1("") \ | |
STABS_CURRENT_FILE(name) \ | |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ | |
ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ | |
.align ALIGNARG(4); \ | |
STABS_FUN(name) \ | |
C_LABEL(name) \ | |
cfi_startproc; \ | |
CALL_MCOUNT | |
#undef END | |
#define END(name) \ | |
cfi_endproc; \ | |
ASM_SIZE_DIRECTIVE(name) \ | |
STABS_FUN_END(name) | |
#ifdef HAVE_CPP_ASM_DEBUGINFO | |
/* Disable that goop, because we just pass -g through to the assembler | |
and it generates proper line number information directly. */ | |
# define STABS_CURRENT_FILE1(name) | |
# define STABS_CURRENT_FILE(name) | |
# define STABS_FUN(name) | |
# define STABS_FUN_END(name) | |
#else | |
/* Remove the following two lines once the gdb bug is fixed. */ | |
#define STABS_CURRENT_FILE(name) \ | |
STABS_CURRENT_FILE1 (#name) | |
#define STABS_CURRENT_FILE1(name) \ | |
1: .stabs name,100,0,0,1b; | |
/* Emit stabs definition lines. We use F(0,1) and define t(0,1) as `int', | |
the same way gcc does it. */ | |
#define STABS_FUN(name) STABS_FUN2(name, name##:F(0,1)) | |
#define STABS_FUN2(name, namestr) \ | |
.stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0; \ | |
.stabs #namestr,36,0,0,name; | |
#define STABS_FUN_END(name) \ | |
1: .stabs "",36,0,0,1b-name; | |
#endif | |
/* 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; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \ | |
cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \ | |
popl %ebp; cfi_def_cfa (esp, 4); | |
#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) \ | |
.globl syscall_error; \ | |
lose: SYSCALL_PIC_SETUP \ | |
jmp JUMPTARGET(syscall_error); \ | |
ENTRY (name) \ | |
DO_CALL (syscall_name, args); \ | |
jb lose | |
#undef PSEUDO_END | |
#define PSEUDO_END(name) \ | |
END (name) | |
#undef JUMPTARGET | |
#ifdef PIC | |
#define JUMPTARGET(name) name##@PLT | |
#define SYSCALL_PIC_SETUP \ | |
pushl %ebx; \ | |
cfi_adjust_cfa_offset (4); \ | |
call 0f; \ | |
0: popl %ebx; \ | |
cfi_adjust_cfa_offset (-4); \ | |
addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx; | |
# ifndef HAVE_HIDDEN | |
# define SETUP_PIC_REG(reg) \ | |
call 1f; \ | |
.subsection 1; \ | |
1:movl (%esp), %e##reg; \ | |
ret; \ | |
.previous | |
# else | |
# define SETUP_PIC_REG(reg) \ | |
.ifndef __i686.get_pc_thunk.reg; \ | |
.section .gnu.linkonce.t.__i686.get_pc_thunk.reg,"ax",@progbits; \ | |
.globl __i686.get_pc_thunk.reg; \ | |
.hidden __i686.get_pc_thunk.reg; \ | |
.type __i686.get_pc_thunk.reg,@function; \ | |
__i686.get_pc_thunk.reg: \ | |
movl (%esp), %e##reg; \ | |
ret; \ | |
.size __i686.get_pc_thunk.reg, . - __i686.get_pc_thunk.reg; \ | |
.previous; \ | |
.endif; \ | |
call __i686.get_pc_thunk.reg | |
# endif | |
# define LOAD_PIC_REG(reg) \ | |
SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg | |
#else | |
#define JUMPTARGET(name) name | |
#define SYSCALL_PIC_SETUP /* Nothing. */ | |
#endif | |
/* Local label name for asm code. */ | |
#ifndef L | |
#ifdef HAVE_ELF | |
#define L(name) .L##name | |
#else | |
#define L(name) name | |
#endif | |
#endif | |
#endif /* __ASSEMBLER__ */ |