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059631af | 1 | /* Definitions for Intel 386 systems using GNU userspace. |
fbd26352 | 2 | Copyright (C) 1994-2019 Free Software Foundation, Inc. |
059631af | 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 | ||
059631af | 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 | ||
059631af | 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 \ | |
140696c8 | 70 | "--32 %{msse2avx:%{!mavx:-msse2avx}}" |
059631af | 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 | ||
ba102931 | 77 | #define GNU_USER_TARGET_LINK_SPEC "-m %(link_emulation) %{shared:-shared} \ |
059631af | 78 | %{!shared: \ |
79 | %{!static: \ | |
6d1ab23d | 80 | %{!static-pie: \ |
81 | %{rdynamic:-export-dynamic} \ | |
82 | -dynamic-linker %(dynamic_linker)}} \ | |
6783cad4 | 83 | %{static:-static} %{static-pie:-static -pie --no-dynamic-linker -z text}}" |
059631af | 84 | |
ba102931 | 85 | #undef LINK_SPEC |
86 | #define LINK_SPEC GNU_USER_TARGET_LINK_SPEC | |
87 | ||
059631af | 88 | /* A C statement (sans semicolon) to output to the stdio stream |
89 | FILE the assembler definition of uninitialized global DECL named | |
90 | NAME whose size is SIZE bytes and alignment is ALIGN bytes. | |
91 | Try to use asm_output_aligned_bss to implement this macro. */ | |
92 | ||
93 | #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ | |
94 | asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) | |
95 | ||
96 | /* A C statement to output to the stdio stream FILE an assembler | |
97 | command to advance the location counter to a multiple of 1<<LOG | |
bc9f52f5 | 98 | bytes if it is within MAX_SKIP bytes. */ |
059631af | 99 | |
bc9f52f5 | 100 | #define SUBALIGN_LOG 3 |
059631af | 101 | |
102 | #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN | |
103 | #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ | |
104 | do { \ | |
105 | if ((LOG) != 0) { \ | |
bc9f52f5 | 106 | if ((MAX_SKIP) == 0 || (MAX_SKIP) >= (1 << (LOG)) - 1) \ |
107 | fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ | |
108 | else \ | |
059631af | 109 | fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ |
059631af | 110 | } \ |
111 | } while (0) | |
112 | #endif | |
113 | ||
114 | /* Handle special EH pointer encodings. Absolute, pc-relative, and | |
115 | indirect are handled automatically. */ | |
116 | #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \ | |
117 | do { \ | |
118 | if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel) \ | |
119 | { \ | |
120 | fputs (ASM_LONG, FILE); \ | |
121 | assemble_name (FILE, XSTR (ADDR, 0)); \ | |
122 | fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \ | |
123 | goto DONE; \ | |
124 | } \ | |
125 | } while (0) | |
126 | ||
059631af | 127 | #ifdef TARGET_LIBC_PROVIDES_SSP |
128 | /* i386 glibc provides __stack_chk_guard in %gs:0x14. */ | |
129 | #define TARGET_THREAD_SSP_OFFSET 0x14 | |
130 | ||
bb26a399 | 131 | /* i386 glibc provides __private_ss in %gs:0x30. */ |
059631af | 132 | #define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30 |
133 | #endif |