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) \ 78 lose: \ 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