105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/* Copyright (C) 1991, 92, 93, 95, 96 Free Software Foundation, Inc.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <sysdeps/unix/sysdep.h>
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#ifdef ASSEMBLER
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/* Syntactic details of assembler. */
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#ifdef HAVE_ELF
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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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/* For ELF we need the `.type' directive to make shared libs work right. */
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#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
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/* In ELF C symbols are asm symbols. */
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#undef NO_UNDERSCORES
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#define NO_UNDERSCORES
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#else
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#define ALIGNARG(log2) log2
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#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
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#endif
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/* Define an entry point visible from C. */
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#define ENTRY(name) \
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ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
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ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \
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.align ALIGNARG(4); \
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C_LABEL(name) \
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CALL_MCOUNT
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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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/* The mcount code relies on a normal frame pointer being on the stack
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to locate our caller, so push one just for its benefit. */
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#define CALL_MCOUNT \
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pushl %ebp; movl %esp, %ebp; call JUMPTARGET(mcount); popl %ebp;
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#else
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#define CALL_MCOUNT /* Do nothing. */
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#endif
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#ifdef NO_UNDERSCORES
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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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#endif
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#define PSEUDO(name, syscall_name, args) \
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lose: SYSCALL_PIC_SETUP \
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jmp 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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jb lose
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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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pushl %ebx; \
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call 0f; \
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0: popl %ebx; \
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addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx;
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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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/* This is defined as a separate macro so that other sysdep.h files
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can include this one and then redefine DO_CALL. */
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#define DO_CALL(syscall_name, args) \
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lea SYS_ify (syscall_name), %eax; \
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/* lcall $7, $0; */ \
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/* Above loses; GAS bug. */ \
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.byte 0x9a, 0, 0, 0, 0, 7, 0
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#define r0 %eax /* Normal return-value register. */
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#define r1 %edx /* Secondary return-value register. */
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#define scratch %ecx /* Call-clobbered register for random use. */
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#define MOVE(x,y) movl x, y
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#endif /* ASSEMBLER */
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