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- /* 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 <common/sysdep.h>
- #ifdef __ASSEMBLER__
- /* Syntactic details of assembler. */
- /* 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
- /* 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;
- # define SETUP_PIC_REG(reg) \
- .ifndef __x86.get_pc_thunk.reg; \
- .section .gnu.linkonce.t.__x86.get_pc_thunk.reg,"ax",@progbits; \
- .globl __x86.get_pc_thunk.reg; \
- .hidden __x86.get_pc_thunk.reg; \
- .type __x86.get_pc_thunk.reg,@function; \
- __x86.get_pc_thunk.reg: \
- movl (%esp), %e##reg; \
- ret; \
- .size __x86.get_pc_thunk.reg, . - __x86.get_pc_thunk.reg; \
- .previous; \
- .endif; \
- call __x86.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__ */
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