diff options
Diffstat (limited to 'sysdeps/i386/sysdep.h')
| -rw-r--r-- | sysdeps/i386/sysdep.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/sysdeps/i386/sysdep.h b/sysdeps/i386/sysdep.h new file mode 100644 index 0000000000..9c312b0d0c --- /dev/null +++ b/sysdeps/i386/sysdep.h @@ -0,0 +1,91 @@ +/* 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 */ |