1 /* Definitions of target machine for GNU compiler. MIPS R3000 version with
2 GOFAST floating point library.
3 Copyright (C) 1994, 1997, 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #define OBJECT_FORMAT_ELF
25 /* Until we figure out what MIPS ELF targets normally use, just do
27 #ifndef PREFERRED_DEBUGGING_TYPE
28 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
31 /* Mostly like ECOFF. */
33 #include "mips/ecoff.h"
35 /* We need to use .esize and .etype instead of .size and .type to
36 avoid conflicting with ELF directives. */
38 #define PUT_SDB_SIZE(a) \
40 extern FILE *asm_out_text_file; \
41 fprintf (asm_out_text_file, "\t.esize\t%d;", (a)); \
45 #define PUT_SDB_TYPE(a) \
47 extern FILE *asm_out_text_file; \
48 fprintf (asm_out_text_file, "\t.etype\t0x%x;", (a)); \
51 /* Biggest alignment supported by the object file format of this
52 machine. Use this macro to limit the alignment which can be
53 specified using the `__attribute__ ((aligned (N)))' construct. If
54 not defined, the default value is `BIGGEST_ALIGNMENT'. */
56 #undef MAX_OFILE_ALIGNMENT
57 #define MAX_OFILE_ALIGNMENT (32768*8)
59 /* Switch into a generic section. */
60 #undef TARGET_ASM_NAMED_SECTION
61 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
63 /* Given that Irix has it's own headers, not having TARGET_GAS here
64 seems a mistake. If we actually need to be prepared for file
65 switching, then we need a custom TARGET_ASM_NAMED_SECTION too. */
68 #define TEXT_SECTION() \
70 if (TARGET_FILE_SWITCHING) \
72 fputs (TEXT_SECTION_ASM_OP, asm_out_file); \
73 fputc ('\n', asm_out_file); \
76 /* The following macro defines the format used to output the second
77 operand of the .type assembler directive. Different svr4 assemblers
78 expect various different forms for this operand. The one given here
79 is just a default. You may need to override it in your machine-
80 specific tm.h file (depending upon the particulars of your assembler). */
82 #define TYPE_OPERAND_FMT "@%s"
84 /* Define the strings used for the special svr4 .type and .size directives.
85 These strings generally do not vary from one system running svr4 to
86 another, but if a given system (e.g. m88k running svr) needs to use
87 different pseudo-op names for these, they may be overridden in the
88 file which includes this one. */
92 #define TYPE_ASM_OP "\t.type\t"
93 #define SIZE_ASM_OP "\t.size\t"
95 /* If defined, a C expression whose value is a string containing the
96 assembler operation to identify the following data as
97 uninitialized global data. If not defined, and neither
98 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
99 uninitialized global data will be output in the data section if
100 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
103 #ifndef BSS_SECTION_ASM_OP
104 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
107 #undef SBSS_SECTION_ASM_OP
108 #define SBSS_SECTION_ASM_OP "\t.section .sbss"
110 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
111 separate, explicit argument. If you define this macro, it is used
112 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
113 handling the required alignment of the variable. The alignment is
114 specified as the number of bits.
116 Try to use function `asm_output_aligned_bss' defined in file
117 `varasm.c' when defining this macro. */
118 #ifndef ASM_OUTPUT_ALIGNED_BSS
119 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
121 ASM_GLOBALIZE_LABEL (FILE, NAME); \
122 if (SIZE > 0 && SIZE <= mips_section_threshold) \
126 ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT)); \
127 last_assemble_variable_decl = DECL; \
128 ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL); \
129 ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1); \
133 /* These macros generate the special .type and .size directives which
134 are used to set the corresponding fields of the linker symbol table
135 entries in an ELF object file under SVR4. These macros also output
136 the starting labels for the relevant functions/objects. */
138 /* Write the extra assembler code needed to declare an object properly. */
140 #undef ASM_DECLARE_OBJECT_NAME
141 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
143 fprintf (FILE, "%s", TYPE_ASM_OP); \
144 assemble_name (FILE, NAME); \
146 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
148 size_directive_output = 0; \
149 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
151 size_directive_output = 1; \
152 fprintf (FILE, "%s", SIZE_ASM_OP); \
153 assemble_name (FILE, NAME); \
154 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
156 mips_declare_object (FILE, NAME, "", ":\n", 0); \
159 /* Output the size directive for a decl in rest_of_decl_compilation
160 in the case where we did not do so before the initializer.
161 Once we find the error_mark_node, we know that the value of
162 size_directive_output was set
163 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
165 #undef ASM_FINISH_DECLARE_OBJECT
166 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
168 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
169 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
170 && ! AT_END && TOP_LEVEL \
171 && DECL_INITIAL (DECL) == error_mark_node \
172 && !size_directive_output) \
174 size_directive_output = 1; \
175 fprintf (FILE, "%s", SIZE_ASM_OP); \
176 assemble_name (FILE, name); \
177 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
181 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
182 do { fputc ( '\t', FILE); \
183 assemble_name (FILE, LABEL1); \
184 fputs ( " = ", FILE); \
185 assemble_name (FILE, LABEL2); \
186 fputc ( '\n', FILE); \
189 /* Note about .weak vs. .weakext
190 The mips native assemblers support .weakext, but not .weak.
191 mips-elf gas supports .weak, but not .weakext.
192 mips-elf gas has been changed to support both .weak and .weakext,
193 but until that support is generally available, the 'if' below
196 #undef ASM_WEAKEN_LABEL
197 #define ASM_WEAKEN_LABEL(FILE,NAME) ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,0)
198 #define ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,VALUE) \
201 fputs ("\t.weak\t", FILE); \
203 fputs ("\t.weakext\t", FILE); \
204 assemble_name (FILE, NAME); \
208 assemble_name (FILE, VALUE); \
210 fputc ('\n', FILE); \
213 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
214 #undef UNIQUE_SECTION
215 #define UNIQUE_SECTION(DECL,RELOC) \
216 mips_unique_section ((DECL), (RELOC))
218 /* A list of other sections which the compiler might be "in" at any
220 #undef EXTRA_SECTIONS
221 #define EXTRA_SECTIONS in_sdata, in_sbss, in_rdata
223 #undef EXTRA_SECTION_FUNCTIONS
224 #define EXTRA_SECTION_FUNCTIONS \
225 SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \
226 SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP) \
227 SECTION_FUNCTION_TEMPLATE(rdata_section, in_rdata, RDATA_SECTION_ASM_OP)
229 #define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP) \
232 if (in_section != ENUM) \
234 fprintf (asm_out_file, "%s\n", OP); \
239 /* On elf, we *do* have support for the .init and .fini sections, and we
240 can put stuff in there to be executed before and after `main'. We let
241 crtstuff.c and other files know this by defining the following symbols.
242 The definitions say how to change sections to the .init and .fini
243 sections. This is the same for all known elf assemblers. */
245 #undef INIT_SECTION_ASM_OP
246 #define INIT_SECTION_ASM_OP "\t.section\t.init"
247 #undef FINI_SECTION_ASM_OP
248 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
250 /* Don't set the target flags, this is done by the linker script */
254 #undef STARTFILE_SPEC
255 #define STARTFILE_SPEC "crti%O%s crtbegin%O%s %{!mno-crt0:crt0%O%s}"
258 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"