| /* Assembler macros for x86-64. |
| Copyright (C) 2001, 2002, 2003 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. */ |
| |
| #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; |
| #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. */ |
| #define ENTRY(name) \ |
| ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ |
| ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ |
| .align ALIGNARG(4); \ |
| C_LABEL(name) \ |
| cfi_startproc; \ |
| CALL_MCOUNT |
| |
| #undef END |
| #define END(name) \ |
| cfi_endproc; \ |
| ASM_SIZE_DIRECTIVE(name) |
| |
| #define ENTRY_CHK(name) ENTRY (name) |
| #define END_CHK(name) END (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 \ |
| pushq %rbp; \ |
| cfi_adjust_cfa_offset(8); \ |
| movq %rsp, %rbp; \ |
| cfi_def_cfa_register(%rbp); \ |
| call JUMPTARGET(mcount); \ |
| popq %rbp; \ |
| cfi_def_cfa(rsp,8); |
| #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: \ |
| 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) |
| |
| #undef JUMPTARGET |
| #ifdef PIC |
| #define JUMPTARGET(name) name##@PLT |
| #else |
| #define JUMPTARGET(name) name |
| #endif |
| |
| /* Local label name for asm code. */ |
| #ifndef L |
| # ifdef HAVE_ELF |
| /* ELF-like local names start with `.L'. */ |
| # define L(name) .L##name |
| # else |
| # define L(name) name |
| # endif |
| #endif |
| |
| #endif /* __ASSEMBLER__ */ |