1/* Assembler macros for x86-64. 2 Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20#include_next <sysdep.h> 21 22#ifdef __ASSEMBLER__ 23 24#ifdef HAVE_ELF 25 26/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ 27#define ALIGNARG(log2) 1<<log2 28/* For ELF we need the `.type' directive to make shared libs work right. */ 29#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg; 30#define ASM_SIZE_DIRECTIVE(name) .size name,.-name; 31 32#else 33 34#define ALIGNARG(log2) log2 35#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */ 36#define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */ 37 38#endif 39 40 41/* Define an entry point visible from C. */ 42#define ENTRY(name) \ 43 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ 44 ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ 45 .align ALIGNARG(4); \ 46 C_LABEL(name) \ 47 cfi_startproc; \ 48 CALL_MCOUNT 49 50#undef END 51#define END(name) \ 52 cfi_endproc; \ 53 ASM_SIZE_DIRECTIVE(name) 54 55/* If compiled for profiling, call `mcount' at the start of each function. */ 56#ifdef PROF 57/* The mcount code relies on a normal frame pointer being on the stack 58 to locate our caller, so push one just for its benefit. */ 59#define CALL_MCOUNT \ 60 pushq %rbp; \ 61 cfi_adjust_cfa_offset(8); \ 62 movq %rsp, %rbp; \ 63 cfi_def_cfa_register(%rbp); \ 64 call JUMPTARGET(mcount); \ 65 popq %rbp; \ 66 cfi_def_cfa(rsp,8); 67#else 68#define CALL_MCOUNT /* Do nothing. */ 69#endif 70 71/* Since C identifiers are not normally prefixed with an underscore 72 on this system, the asm identifier `syscall_error' intrudes on the 73 C name space. Make sure we use an innocuous name. */ 74#define syscall_error __syscall_error 75#define mcount _mcount 76 77#define PSEUDO(name, syscall_name, args) \ 78lose: \ 79 jmp JUMPTARGET(syscall_error) \ 80 .globl syscall_error; \ 81 ENTRY (name) \ 82 DO_CALL (syscall_name, args); \ 83 jb lose 84 85#undef PSEUDO_END 86#define PSEUDO_END(name) \ 87 END (name) 88 89#undef JUMPTARGET 90#ifdef PIC 91#define JUMPTARGET(name) name##@PLT 92#else 93#define JUMPTARGET(name) name 94#endif 95 96/* Local label name for asm code. */ 97#ifndef L 98# ifdef HAVE_ELF 99/* ELF-like local names start with `.L'. */ 100# define L(name) .L##name 101# else 102# define L(name) name 103# endif 104#endif 105 106#endif /* __ASSEMBLER__ */ 107