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Diffstat (limited to 'REORG.TODO/sysdeps/i386/sysdep.h')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/sysdep.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/sysdep.h b/REORG.TODO/sysdeps/i386/sysdep.h new file mode 100644 index 0000000000..d2b0860b99 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/sysdep.h @@ -0,0 +1,159 @@ +/* Assembler macros for i386. + Copyright (C) 1991-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdeps/generic/sysdep.h> + +#include <features.h> /* For __GNUC_PREREQ. */ + +/* It is desirable that the names of PIC thunks match those used by + GCC so that multiple copies are eliminated by the linker. Because + GCC 4.6 and earlier use __i686 in the names, it is necessary to + override that predefined macro. */ +#if defined __i686 && defined __ASSEMBLER__ +#undef __i686 +#define __i686 __i686 +#endif + +#ifdef __ASSEMBLER__ +# define GET_PC_THUNK(reg) __x86.get_pc_thunk.reg +#else +# define GET_PC_THUNK_STR(reg) "__x86.get_pc_thunk." #reg +#endif + +#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 +#define ASM_SIZE_DIRECTIVE(name) .size name,.-name; + + +/* 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) \ + .globl C_SYMBOL_NAME(name); \ + .type 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 \ + 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 + +/* 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 + +#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) + +# define SETUP_PIC_REG(reg) \ + .ifndef GET_PC_THUNK(reg); \ + .section .gnu.linkonce.t.GET_PC_THUNK(reg),"ax",@progbits; \ + .globl GET_PC_THUNK(reg); \ + .hidden GET_PC_THUNK(reg); \ + .p2align 4; \ + .type GET_PC_THUNK(reg),@function; \ +GET_PC_THUNK(reg): \ + movl (%esp), %e##reg; \ + ret; \ + .size GET_PC_THUNK(reg), . - GET_PC_THUNK(reg); \ + .previous; \ + .endif; \ + call GET_PC_THUNK(reg) + +# define LOAD_PIC_REG(reg) \ + SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg + +#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; + +#else +#define JUMPTARGET(name) name +#define SYSCALL_PIC_SETUP /* Nothing. */ +#endif + +/* Local label name for asm code. */ +#ifndef L +#define L(name) .L##name +#endif + +#define atom_text_section .section ".text.atom", "ax" + +#else /* __ASSEMBLER__ */ + +# define SETUP_PIC_REG_STR(reg) \ + ".ifndef " GET_PC_THUNK_STR (reg) "\n" \ + ".section .gnu.linkonce.t." GET_PC_THUNK_STR (reg) ",\"ax\",@progbits\n" \ + ".globl " GET_PC_THUNK_STR (reg) "\n" \ + ".hidden " GET_PC_THUNK_STR (reg) "\n" \ + ".p2align 4\n" \ + ".type " GET_PC_THUNK_STR (reg) ",@function\n" \ +GET_PC_THUNK_STR (reg) ":" \ + "movl (%%esp), %%e" #reg "\n" \ + "ret\n" \ + ".size " GET_PC_THUNK_STR (reg) ", . - " GET_PC_THUNK_STR (reg) "\n" \ + ".previous\n" \ + ".endif\n" \ + "call " GET_PC_THUNK_STR (reg) + +# define LOAD_PIC_REG_STR(reg) \ + SETUP_PIC_REG_STR (reg) "\naddl $_GLOBAL_OFFSET_TABLE_, %%e" #reg + +#endif /* __ASSEMBLER__ */ |