/* Assembler macros for i386. Copyright (C) 1991-93,95,96,98,2002,2003,2005 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) #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; # ifndef HAVE_HIDDEN # define SETUP_PIC_REG(reg) \ call 1f; \ .subsection 1; \ 1:movl (%esp), %e##reg; \ ret; \ .previous # else # 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 # endif # 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__ */