1 /* Definitions of target machine for GNU compiler. MIPS R3000 version with
2 GOFAST floating point library.
3 Copyright (C) 1994, 1997, 1999, 2000, 2002, 2003
4 Free Software Foundation, Inc.
6 This file is part of GNU CC.
8 GNU CC 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 2, or (at your option)
13 GNU CC 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.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 #undef OBJECT_FORMAT_COFF
27 /* ??? Move all SDB stuff into separate header file. */
28 #undef SDB_DEBUGGING_INFO
30 #define DBX_DEBUGGING_INFO 1
31 #define DWARF2_DEBUGGING_INFO 1
33 #undef PREFERRED_DEBUGGING_TYPE
34 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
36 #undef SUBTARGET_ASM_DEBUGGING_SPEC
37 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
39 /* Biggest alignment supported by the object file format of this
40 machine. Use this macro to limit the alignment which can be
41 specified using the `__attribute__ ((aligned (N)))' construct. If
42 not defined, the default value is `BIGGEST_ALIGNMENT'. */
44 #undef MAX_OFILE_ALIGNMENT
45 #define MAX_OFILE_ALIGNMENT (32768*8)
47 /* Switch into a generic section. */
48 #undef TARGET_ASM_NAMED_SECTION
49 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
51 /* Given that Irix has it's own headers, not having TARGET_GAS here
52 seems a mistake. If we actually need to be prepared for file
53 switching, then we need a custom TARGET_ASM_NAMED_SECTION too. */
56 #define TEXT_SECTION() \
58 if (TARGET_FILE_SWITCHING) \
60 fputs (TEXT_SECTION_ASM_OP, asm_out_file); \
61 fputc ('\n', asm_out_file); \
64 /* The following macro defines the format used to output the second
65 operand of the .type assembler directive. Different svr4 assemblers
66 expect various different forms for this operand. The one given here
67 is just a default. You may need to override it in your machine-
68 specific tm.h file (depending upon the particulars of your assembler). */
70 #define TYPE_OPERAND_FMT "@%s"
72 /* Define the strings used for the special svr4 .type and .size directives.
73 These strings generally do not vary from one system running svr4 to
74 another, but if a given system (e.g. m88k running svr) needs to use
75 different pseudo-op names for these, they may be overridden in the
76 file which includes this one. */
80 #define TYPE_ASM_OP "\t.type\t"
81 #define SIZE_ASM_OP "\t.size\t"
83 /* If defined, a C expression whose value is a string containing the
84 assembler operation to identify the following data as
85 uninitialized global data. If not defined, and neither
86 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
87 uninitialized global data will be output in the data section if
88 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
91 #ifndef BSS_SECTION_ASM_OP
92 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
95 #undef SBSS_SECTION_ASM_OP
96 #define SBSS_SECTION_ASM_OP "\t.section .sbss"
98 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
99 separate, explicit argument. If you define this macro, it is used
100 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
101 handling the required alignment of the variable. The alignment is
102 specified as the number of bits.
104 Try to use function `asm_output_aligned_bss' defined in file
105 `varasm.c' when defining this macro. */
106 #ifndef ASM_OUTPUT_ALIGNED_BSS
107 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
109 if (SIZE > 0 && SIZE <= (unsigned HOST_WIDE_INT)mips_section_threshold)\
113 ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT)); \
114 last_assemble_variable_decl = DECL; \
115 ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL); \
116 ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1); \
120 /* These macros generate the special .type and .size directives which
121 are used to set the corresponding fields of the linker symbol table
122 entries in an ELF object file under SVR4. These macros also output
123 the starting labels for the relevant functions/objects. */
125 /* Write the extra assembler code needed to declare an object properly. */
127 #undef ASM_DECLARE_OBJECT_NAME
128 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
130 HOST_WIDE_INT size; \
131 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
132 size_directive_output = 0; \
133 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
135 size_directive_output = 1; \
136 size = int_size_in_bytes (TREE_TYPE (DECL)); \
137 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
139 mips_declare_object (FILE, NAME, "", ":\n", 0); \
142 /* Output the size directive for a decl in rest_of_decl_compilation
143 in the case where we did not do so before the initializer.
144 Once we find the error_mark_node, we know that the value of
145 size_directive_output was set
146 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
148 #undef ASM_FINISH_DECLARE_OBJECT
149 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
151 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
152 HOST_WIDE_INT size; \
154 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
155 && ! AT_END && TOP_LEVEL \
156 && DECL_INITIAL (DECL) == error_mark_node \
157 && !size_directive_output) \
159 size_directive_output = 1; \
160 size = int_size_in_bytes (TREE_TYPE (DECL)); \
161 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
165 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
166 do { fputc ( '\t', FILE); \
167 assemble_name (FILE, LABEL1); \
168 fputs ( " = ", FILE); \
169 assemble_name (FILE, LABEL2); \
170 fputc ( '\n', FILE); \
173 /* Note about .weak vs. .weakext
174 The mips native assemblers support .weakext, but not .weak.
175 mips-elf gas supports .weak, but not .weakext.
176 mips-elf gas has been changed to support both .weak and .weakext,
177 but until that support is generally available, the 'if' below
180 #undef ASM_WEAKEN_LABEL
181 #define ASM_WEAKEN_LABEL(FILE,NAME) ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,0)
182 #define ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,VALUE) \
185 fputs ("\t.weak\t", FILE); \
187 fputs ("\t.weakext\t", FILE); \
188 assemble_name (FILE, NAME); \
192 assemble_name (FILE, VALUE); \
194 fputc ('\n', FILE); \
197 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
199 #define TARGET_ASM_UNIQUE_SECTION mips_unique_section
201 /* A list of other sections which the compiler might be "in" at any
203 #undef EXTRA_SECTIONS
204 #define EXTRA_SECTIONS in_sdata, in_sbss
206 #undef EXTRA_SECTION_FUNCTIONS
207 #define EXTRA_SECTION_FUNCTIONS \
208 SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \
209 SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP)
211 #define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP) \
214 if (in_section != ENUM) \
216 fprintf (asm_out_file, "%s\n", OP); \
221 /* On elf, we *do* have support for the .init and .fini sections, and we
222 can put stuff in there to be executed before and after `main'. We let
223 crtstuff.c and other files know this by defining the following symbols.
224 The definitions say how to change sections to the .init and .fini
225 sections. This is the same for all known elf assemblers. */
227 #undef INIT_SECTION_ASM_OP
228 #define INIT_SECTION_ASM_OP "\t.section\t.init"
229 #undef FINI_SECTION_ASM_OP
230 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
232 /* Don't set the target flags, this is done by the linker script */
236 #undef STARTFILE_SPEC
237 #define STARTFILE_SPEC "crti%O%s crtbegin%O%s"
240 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
242 /* We support #pragma. */
243 #define HANDLE_SYSV_PRAGMA 1