1/* Definitions for Intel 386 systems using GNU userspace. 2 Copyright (C) 1994-2015 Free Software Foundation, Inc. 3 Contributed by Eric Youngdale. 4 Modified for stabs-in-ELF by H.J. Lu. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify 9it under the terms of the GNU General Public License as published by 10the Free Software Foundation; either version 3, or (at your option) 11any later version. 12 13GCC is distributed in the hope that it will be useful, 14but WITHOUT ANY WARRANTY; without even the implied warranty of 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16GNU General Public License for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING3. If not see 20<http://www.gnu.org/licenses/>. */ 21 22/* Output at beginning of assembler file. */ 23/* The .file command should always begin the output. */ 24#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true 25 26#undef ASM_COMMENT_START 27#define ASM_COMMENT_START "#" 28 29#undef DBX_REGISTER_NUMBER 30#define DBX_REGISTER_NUMBER(n) \ 31 (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n]) 32 33/* Output assembler code to FILE to call the profiler. 34 To the best of my knowledge, no GNU userspace libc has required the label 35 argument to mcount. */ 36 37#define NO_PROFILE_COUNTERS 1 38 39#undef MCOUNT_NAME 40#define MCOUNT_NAME "mcount" 41 42/* The GLIBC version of mcount for the x86 assumes that there is a 43 frame, so we cannot allow profiling without a frame pointer. */ 44 45#undef SUBTARGET_FRAME_POINTER_REQUIRED 46#define SUBTARGET_FRAME_POINTER_REQUIRED crtl->profile 47 48#undef SIZE_TYPE 49#define SIZE_TYPE "unsigned int" 50 51#undef PTRDIFF_TYPE 52#define PTRDIFF_TYPE "int" 53 54#undef WCHAR_TYPE 55#define WCHAR_TYPE "long int" 56 57#undef WCHAR_TYPE_SIZE 58#define WCHAR_TYPE_SIZE BITS_PER_WORD 59 60/* Provide a LINK_SPEC appropriate for GNU userspace. Here we provide support 61 for the special GCC options -static and -shared, which allow us to 62 link things in one of these three modes by applying the appropriate 63 combinations of options at link-time. 64 65 When the -shared link option is used a final link is not being 66 done. */ 67 68#undef ASM_SPEC 69#define ASM_SPEC \ 70 "--32 %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}" 71 72#undef SUBTARGET_EXTRA_SPECS 73#define SUBTARGET_EXTRA_SPECS \ 74 { "link_emulation", GNU_USER_LINK_EMULATION },\ 75 { "dynamic_linker", GNU_USER_DYNAMIC_LINKER } 76 77#define GNU_USER_TARGET_LINK_SPEC "-m %(link_emulation) %{shared:-shared} \ 78 %{!shared: \ 79 %{!static: \ 80 %{rdynamic:-export-dynamic} \ 81 -dynamic-linker %(dynamic_linker)} \ 82 %{static:-static}}" 83 84#undef LINK_SPEC 85#define LINK_SPEC GNU_USER_TARGET_LINK_SPEC 86 87/* A C statement (sans semicolon) to output to the stdio stream 88 FILE the assembler definition of uninitialized global DECL named 89 NAME whose size is SIZE bytes and alignment is ALIGN bytes. 90 Try to use asm_output_aligned_bss to implement this macro. */ 91 92#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 93 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 94 95/* A C statement to output to the stdio stream FILE an assembler 96 command to advance the location counter to a multiple of 1<<LOG 97 bytes if it is within MAX_SKIP bytes. 98 99 This is used to align code labels according to Intel recommendations. */ 100 101#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 102#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ 103 do { \ 104 if ((LOG) != 0) { \ 105 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 106 else { \ 107 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 108 /* Make sure that we have at least 8 byte alignment if > 8 byte \ 109 alignment is preferred. */ \ 110 if ((LOG) > 3 \ 111 && (1 << (LOG)) > ((MAX_SKIP) + 1) \ 112 && (MAX_SKIP) >= 7) \ 113 fputs ("\t.p2align 3\n", (FILE)); \ 114 } \ 115 } \ 116 } while (0) 117#endif 118 119/* Handle special EH pointer encodings. Absolute, pc-relative, and 120 indirect are handled automatically. */ 121#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ 122 do { \ 123 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \ 124 { \ 125 fputs (ASM_LONG, FILE); \ 126 assemble_name (FILE, XSTR (ADDR, 0)); \ 127 fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \ 128 goto DONE; \ 129 } \ 130 } while (0) 131 132#ifdef TARGET_LIBC_PROVIDES_SSP 133/* i386 glibc provides __stack_chk_guard in %gs:0x14. */ 134#define TARGET_THREAD_SSP_OFFSET 0x14 135 136/* We steal the last transactional memory word. */ 137#define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30 138#endif 139