| /* Assembler macros for i386. |
| Copyright (C) 1991-93,95,96,98,2002,2003,2005,2006 |
| 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. |
| |
| There is currently a bug in gdb which prevents us from specifying |
| incomplete stabs information. Fake some entries here which specify |
| the current source file. */ |
| #define ENTRY(name) \ |
| STABS_CURRENT_FILE1("") \ |
| STABS_CURRENT_FILE(name) \ |
| ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ |
| ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ |
| .align ALIGNARG(4); \ |
| STABS_FUN(name) \ |
| C_LABEL(name) \ |
| cfi_startproc; \ |
| CALL_MCOUNT |
| |
| #undef END |
| #define END(name) \ |
| cfi_endproc; \ |
| ASM_SIZE_DIRECTIVE(name) \ |
| STABS_FUN_END(name) |
| |
| #define ENTRY_CHK(name) ENTRY (name) |
| #define END_CHK(name) END (name) |
| |
| #ifdef HAVE_CPP_ASM_DEBUGINFO |
| /* Disable that goop, because we just pass -g through to the assembler |
| and it generates proper line number information directly. */ |
| # define STABS_CURRENT_FILE1(name) |
| # define STABS_CURRENT_FILE(name) |
| # define STABS_FUN(name) |
| # define STABS_FUN_END(name) |
| #else |
| /* Remove the following two lines once the gdb bug is fixed. */ |
| #define STABS_CURRENT_FILE(name) \ |
| STABS_CURRENT_FILE1 (#name) |
| #define STABS_CURRENT_FILE1(name) \ |
| 1: .stabs name,100,0,0,1b; |
| /* Emit stabs definition lines. We use F(0,1) and define t(0,1) as `int', |
| the same way gcc does it. */ |
| #define STABS_FUN(name) STABS_FUN2(name, name##:F(0,1)) |
| #define STABS_FUN2(name, namestr) \ |
| .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0; \ |
| .stabs #namestr,36,0,0,name; |
| #define STABS_FUN_END(name) \ |
| 1: .stabs "",36,0,0,1b-name; |
| #endif |
| |
| /* 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; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \ |
| cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \ |
| popl %ebp; cfi_def_cfa (esp, 4); |
| #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) \ |
| .globl syscall_error; \ |
| lose: SYSCALL_PIC_SETUP \ |
| jmp JUMPTARGET(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 |
| #define SYSCALL_PIC_SETUP \ |
| pushl %ebx; \ |
| cfi_adjust_cfa_offset (4); \ |
| call 0f; \ |
| 0: popl %ebx; \ |
| cfi_adjust_cfa_offset (-4); \ |
| addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx; |
| |
| # define SETUP_PIC_REG(reg) \ |
| .ifndef __i686.get_pc_thunk.reg; \ |
| .section .gnu.linkonce.t.__i686.get_pc_thunk.reg,"ax",@progbits; \ |
| .globl __i686.get_pc_thunk.reg; \ |
| .hidden __i686.get_pc_thunk.reg; \ |
| .type __i686.get_pc_thunk.reg,@function; \ |
| __i686.get_pc_thunk.reg: \ |
| movl (%esp), %e##reg; \ |
| ret; \ |
| .size __i686.get_pc_thunk.reg, . - __i686.get_pc_thunk.reg; \ |
| .previous; \ |
| .endif; \ |
| call __i686.get_pc_thunk.reg |
| |
| # define LOAD_PIC_REG(reg) \ |
| SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg |
| |
| #else |
| #define JUMPTARGET(name) name |
| #define SYSCALL_PIC_SETUP /* Nothing. */ |
| #endif |
| |
| /* Local label name for asm code. */ |
| #ifndef L |
| #ifdef HAVE_ELF |
| #define L(name) .L##name |
| #else |
| #define L(name) name |
| #endif |
| #endif |
| |
| #endif /* __ASSEMBLER__ */ |