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 #define DBX_DEBUGGING_INFO 1
28 #define DWARF2_DEBUGGING_INFO 1
30 #undef PREFERRED_DEBUGGING_TYPE
31 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
33 #undef SUBTARGET_ASM_DEBUGGING_SPEC
34 #define SUBTARGET_ASM_DEBUGGING_SPEC "-g0"
36 /* Biggest alignment supported by the object file format of this
37 machine. Use this macro to limit the alignment which can be
38 specified using the `__attribute__ ((aligned (N)))' construct. If
39 not defined, the default value is `BIGGEST_ALIGNMENT'. */
41 #undef MAX_OFILE_ALIGNMENT
42 #define MAX_OFILE_ALIGNMENT (32768*8)
44 /* Switch into a generic section. */
45 #undef TARGET_ASM_NAMED_SECTION
46 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
48 /* The following macro defines the format used to output the second
49 operand of the .type assembler directive. Different svr4 assemblers
50 expect various different forms for this operand. The one given here
51 is just a default. You may need to override it in your machine-
52 specific tm.h file (depending upon the particulars of your assembler). */
54 #define TYPE_OPERAND_FMT "@%s"
56 /* Define the strings used for the special svr4 .type and .size directives.
57 These strings generally do not vary from one system running svr4 to
58 another, but if a given system (e.g. m88k running svr) needs to use
59 different pseudo-op names for these, they may be overridden in the
60 file which includes this one. */
64 #define TYPE_ASM_OP "\t.type\t"
65 #define SIZE_ASM_OP "\t.size\t"
67 /* If defined, a C expression whose value is a string containing the
68 assembler operation to identify the following data as
69 uninitialized global data. If not defined, and neither
70 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
71 uninitialized global data will be output in the data section if
72 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
75 #ifndef BSS_SECTION_ASM_OP
76 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
79 #undef SBSS_SECTION_ASM_OP
80 #define SBSS_SECTION_ASM_OP "\t.section .sbss"
82 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
83 separate, explicit argument. If you define this macro, it is used
84 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
85 handling the required alignment of the variable. The alignment is
86 specified as the number of bits.
88 Try to use function `asm_output_aligned_bss' defined in file
89 `varasm.c' when defining this macro. */
90 #ifndef ASM_OUTPUT_ALIGNED_BSS
91 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
93 if (SIZE > 0 && SIZE <= (unsigned HOST_WIDE_INT)mips_section_threshold)\
94 named_section (0, ".sbss", 0); \
97 ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT)); \
98 last_assemble_variable_decl = DECL; \
99 ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL); \
100 ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1); \
104 /* These macros generate the special .type and .size directives which
105 are used to set the corresponding fields of the linker symbol table
106 entries in an ELF object file under SVR4. These macros also output
107 the starting labels for the relevant functions/objects. */
109 /* Write the extra assembler code needed to declare an object properly. */
111 #undef ASM_DECLARE_OBJECT_NAME
112 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
114 HOST_WIDE_INT size; \
115 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
116 size_directive_output = 0; \
117 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
119 size_directive_output = 1; \
120 size = int_size_in_bytes (TREE_TYPE (DECL)); \
121 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
123 mips_declare_object (FILE, NAME, "", ":\n", 0); \
126 /* Output the size directive for a decl in rest_of_decl_compilation
127 in the case where we did not do so before the initializer.
128 Once we find the error_mark_node, we know that the value of
129 size_directive_output was set
130 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
132 #undef ASM_FINISH_DECLARE_OBJECT
133 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
135 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
136 HOST_WIDE_INT size; \
138 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
139 && ! AT_END && TOP_LEVEL \
140 && DECL_INITIAL (DECL) == error_mark_node \
141 && !size_directive_output) \
143 size_directive_output = 1; \
144 size = int_size_in_bytes (TREE_TYPE (DECL)); \
145 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
149 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
150 do { fputc ( '\t', FILE); \
151 assemble_name (FILE, LABEL1); \
152 fputs ( " = ", FILE); \
153 assemble_name (FILE, LABEL2); \
154 fputc ( '\n', FILE); \
157 /* Note about .weak vs. .weakext
158 The mips native assemblers support .weakext, but not .weak.
159 mips-elf gas supports .weak, but not .weakext.
160 mips-elf gas has been changed to support both .weak and .weakext,
161 but until that support is generally available, the 'if' below
164 #undef ASM_WEAKEN_LABEL
165 #define ASM_WEAKEN_LABEL(FILE,NAME) ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,0)
166 #define ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,VALUE) \
169 fputs ("\t.weak\t", FILE); \
171 fputs ("\t.weakext\t", FILE); \
172 assemble_name (FILE, NAME); \
176 assemble_name (FILE, VALUE); \
178 fputc ('\n', FILE); \
181 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
183 /* On elf, we *do* have support for the .init and .fini sections, and we
184 can put stuff in there to be executed before and after `main'. We let
185 crtstuff.c and other files know this by defining the following symbols.
186 The definitions say how to change sections to the .init and .fini
187 sections. This is the same for all known elf assemblers. */
189 #undef INIT_SECTION_ASM_OP
190 #define INIT_SECTION_ASM_OP "\t.section\t.init"
191 #undef FINI_SECTION_ASM_OP
192 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
194 /* Don't set the target flags, this is done by the linker script */
198 #undef STARTFILE_SPEC
199 #define STARTFILE_SPEC "crti%O%s crtbegin%O%s"
202 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
204 /* We support #pragma. */
205 #define HANDLE_SYSV_PRAGMA 1