131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/* Assembler macros for i386.
|
|
Copyright (C) 1991, 92, 93, 95, 96, 98 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. */
|
|
|
|
#define NO_UNDERSCORES
|
|
|
|
#include <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) \
|
|
CALL_MCOUNT
|
|
|
|
#undef END
|
|
#define END(name) \
|
|
ASM_SIZE_DIRECTIVE(name) \
|
|
STABS_FUN_END(name)
|
|
|
|
/* 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;
|
|
|
|
/* 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
|
|
|
|
#undef PSEUDO_END
|
|
#define PSEUDO_END(name) \
|
|
END (name)
|
|
|
|
#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
|
|
|
|
/* Local label name for asm code. */
|
|
#ifndef L
|
|
#define L(name) name
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLER__ */
|