1 /* Definitions for Intel 386 systems using GNU userspace. 2 Copyright (C) 1994-2022 Free Software Foundation, Inc. 3 Contributed by Eric Youngdale. 4 Modified for stabs-in-ELF by H.J. Lu. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3, or (at your option) 11 any later version. 12 13 GCC is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along 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 #undef SIZE_TYPE 43 #define SIZE_TYPE "unsigned int" 44 45 #undef PTRDIFF_TYPE 46 #define PTRDIFF_TYPE "int" 47 48 #undef WCHAR_TYPE 49 #define WCHAR_TYPE "long int" 50 51 #undef WCHAR_TYPE_SIZE 52 #define WCHAR_TYPE_SIZE BITS_PER_WORD 53 54 /* Provide a LINK_SPEC appropriate for GNU userspace. Here we provide support 55 for the special GCC options -static and -shared, which allow us to 56 link things in one of these three modes by applying the appropriate 57 combinations of options at link-time. 58 59 When the -shared link option is used a final link is not being 60 done. */ 61 62 #undef ASM_SPEC 63 #define ASM_SPEC \ 64 "--32 %{msse2avx:%{!mavx:-msse2avx}}" 65 66 #undef SUBTARGET_EXTRA_SPECS 67 #define SUBTARGET_EXTRA_SPECS \ 68 { "link_emulation", GNU_USER_LINK_EMULATION },\ 69 { "dynamic_linker", GNU_USER_DYNAMIC_LINKER } 70 71 #define GNU_USER_TARGET_LINK_SPEC "-m %(link_emulation) %{shared:-shared} \ 72 %{!shared: \ 73 %{!static: \ 74 %{!static-pie: \ 75 %{rdynamic:-export-dynamic} \ 76 -dynamic-linker %(dynamic_linker)}} \ 77 %{static:-static} %{static-pie:-static -pie --no-dynamic-linker -z text}}" 78 79 #undef LINK_SPEC 80 #define LINK_SPEC GNU_USER_TARGET_LINK_SPEC 81 82 /* A C statement (sans semicolon) to output to the stdio stream 83 FILE the assembler definition of uninitialized global DECL named 84 NAME whose size is SIZE bytes and alignment is ALIGN bytes. 85 Try to use asm_output_aligned_bss to implement this macro. */ 86 87 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 88 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 89 90 /* A C statement to output to the stdio stream FILE an assembler 91 command to advance the location counter to a multiple of 1<<LOG 92 bytes if it is within MAX_SKIP bytes. */ 93 94 #define SUBALIGN_LOG 3 95 96 /* Handle special EH pointer encodings. Absolute, pc-relative, and 97 indirect are handled automatically. */ 98 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ 99 do { \ 100 if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \ 101 { \ 102 fputs (ASM_LONG, FILE); \ 103 assemble_name (FILE, XSTR (ADDR, 0)); \ 104 fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \ 105 goto DONE; \ 106 } \ 107 } while (0) 108 109 #ifdef TARGET_LIBC_PROVIDES_SSP 110 /* i386 glibc provides __stack_chk_guard in %gs:0x14. */ 111 #define TARGET_THREAD_SSP_OFFSET 0x14 112 113 /* i386 glibc provides __private_ss in %gs:0x30. */ 114 #define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30 115 #endif 116