| /* Definitions of target machine for GNU compiler. MIPS R3000 version with |
| GOFAST floating point library. |
| Copyright (C) 1994, 1997, 1999, 2000 Free Software Foundation, Inc. |
| |
| This file is part of GNU CC. |
| |
| GNU CC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU CC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU CC; see the file COPYING. If not, write to |
| the Free Software Foundation, 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* Use ELF. */ |
| #define OBJECT_FORMAT_ELF |
| |
| /* Until we figure out what MIPS ELF targets normally use, just do |
| stabs in ELF. */ |
| #ifndef PREFERRED_DEBUGGING_TYPE |
| #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG |
| #endif |
| |
| /* Mostly like ECOFF. */ |
| #include "gofast.h" |
| #include "mips/ecoff.h" |
| |
| /* We need to use .esize and .etype instead of .size and .type to |
| avoid conflicting with ELF directives. */ |
| #undef PUT_SDB_SIZE |
| #define PUT_SDB_SIZE(a) \ |
| do { \ |
| extern FILE *asm_out_text_file; \ |
| fprintf (asm_out_text_file, "\t.esize\t%d;", (a)); \ |
| } while (0) |
| |
| #undef PUT_SDB_TYPE |
| #define PUT_SDB_TYPE(a) \ |
| do { \ |
| extern FILE *asm_out_text_file; \ |
| fprintf (asm_out_text_file, "\t.etype\t0x%x;", (a)); \ |
| } while (0) |
| |
| /* Biggest alignment supported by the object file format of this |
| machine. Use this macro to limit the alignment which can be |
| specified using the `__attribute__ ((aligned (N)))' construct. If |
| not defined, the default value is `BIGGEST_ALIGNMENT'. */ |
| |
| #define MAX_OFILE_ALIGNMENT (32768*8) |
| |
| /* A C statement to output something to the assembler file to switch to section |
| NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL or |
| NULL_TREE. Some target formats do not support arbitrary sections. Do not |
| define this macro in such cases. */ |
| |
| #define ASM_OUTPUT_SECTION_NAME(F, DECL, NAME, RELOC) \ |
| do { \ |
| extern FILE *asm_out_text_file; \ |
| if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL) \ |
| fprintf (asm_out_text_file, "\t.section %s,\"ax\",@progbits\n", (NAME)); \ |
| else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC)) \ |
| fprintf (F, "\t.section %s,\"a\",@progbits\n", (NAME)); \ |
| else if (! strcmp (NAME, ".bss")) \ |
| fprintf (F, "\t.section %s,\"aw\",@nobits\n", (NAME)); \ |
| else \ |
| fprintf (F, "\t.section %s,\"aw\",@progbits\n", (NAME)); \ |
| } while (0) |
| |
| /* The following macro defines the format used to output the second |
| operand of the .type assembler directive. Different svr4 assemblers |
| expect various different forms for this operand. The one given here |
| is just a default. You may need to override it in your machine- |
| specific tm.h file (depending upon the particulars of your assembler). */ |
| |
| #define TYPE_OPERAND_FMT "@%s" |
| |
| /* Define the strings used for the special svr4 .type and .size directives. |
| These strings generally do not vary from one system running svr4 to |
| another, but if a given system (e.g. m88k running svr) needs to use |
| different pseudo-op names for these, they may be overridden in the |
| file which includes this one. */ |
| |
| #undef TYPE_ASM_OP |
| #undef SIZE_ASM_OP |
| #define TYPE_ASM_OP "\t.type\t" |
| #define SIZE_ASM_OP "\t.size\t" |
| |
| /* If defined, a C expression whose value is a string containing the |
| assembler operation to identify the following data as |
| uninitialized global data. If not defined, and neither |
| `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined, |
| uninitialized global data will be output in the data section if |
| `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be |
| used. */ |
| #ifndef BSS_SECTION_ASM_OP |
| #define BSS_SECTION_ASM_OP "\t.section\t.bss" |
| #endif |
| |
| #define SBSS_SECTION_ASM_OP "\t.section .sbss" |
| |
| /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a |
| separate, explicit argument. If you define this macro, it is used |
| in place of `ASM_OUTPUT_BSS', and gives you more flexibility in |
| handling the required alignment of the variable. The alignment is |
| specified as the number of bits. |
| |
| Try to use function `asm_output_aligned_bss' defined in file |
| `varasm.c' when defining this macro. */ |
| #ifndef ASM_OUTPUT_ALIGNED_BSS |
| #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ |
| do { \ |
| ASM_GLOBALIZE_LABEL (FILE, NAME); \ |
| if (SIZE > 0 && SIZE <= mips_section_threshold) \ |
| sbss_section (); \ |
| else \ |
| bss_section (); \ |
| ASM_OUTPUT_ALIGN (FILE, floor_log2 (ALIGN / BITS_PER_UNIT)); \ |
| last_assemble_variable_decl = DECL; \ |
| ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL); \ |
| ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1); \ |
| } while (0) |
| #endif |
| |
| /* These macros generate the special .type and .size directives which |
| are used to set the corresponding fields of the linker symbol table |
| entries in an ELF object file under SVR4. These macros also output |
| the starting labels for the relevant functions/objects. */ |
| |
| /* Write the extra assembler code needed to declare an object properly. */ |
| |
| #undef ASM_DECLARE_OBJECT_NAME |
| #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ |
| do { \ |
| fprintf (FILE, "%s", TYPE_ASM_OP); \ |
| assemble_name (FILE, NAME); \ |
| putc (',', FILE); \ |
| fprintf (FILE, TYPE_OPERAND_FMT, "object"); \ |
| putc ('\n', FILE); \ |
| size_directive_output = 0; \ |
| if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \ |
| { \ |
| size_directive_output = 1; \ |
| fprintf (FILE, "%s", SIZE_ASM_OP); \ |
| assemble_name (FILE, NAME); \ |
| fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \ |
| } \ |
| mips_declare_object (FILE, NAME, "", ":\n", 0); \ |
| } while (0) |
| |
| /* Output the size directive for a decl in rest_of_decl_compilation |
| in the case where we did not do so before the initializer. |
| Once we find the error_mark_node, we know that the value of |
| size_directive_output was set |
| by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */ |
| |
| #undef ASM_FINISH_DECLARE_OBJECT |
| #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ |
| do { \ |
| const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ |
| if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ |
| && ! AT_END && TOP_LEVEL \ |
| && DECL_INITIAL (DECL) == error_mark_node \ |
| && !size_directive_output) \ |
| { \ |
| size_directive_output = 1; \ |
| fprintf (FILE, "%s", SIZE_ASM_OP); \ |
| assemble_name (FILE, name); \ |
| fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \ |
| } \ |
| } while (0) |
| |
| #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \ |
| do { fputc ( '\t', FILE); \ |
| assemble_name (FILE, LABEL1); \ |
| fputs ( " = ", FILE); \ |
| assemble_name (FILE, LABEL2); \ |
| fputc ( '\n', FILE); \ |
| } while (0) |
| |
| /* Note about .weak vs. .weakext |
| The mips native assemblers support .weakext, but not .weak. |
| mips-elf gas supports .weak, but not .weakext. |
| mips-elf gas has been changed to support both .weak and .weakext, |
| but until that support is generally available, the 'if' below |
| should serve. */ |
| |
| #define ASM_WEAKEN_LABEL(FILE,NAME) ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,0) |
| #define ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,VALUE) \ |
| do { \ |
| if (TARGET_GAS) \ |
| fputs ("\t.weak\t", FILE); \ |
| else \ |
| fputs ("\t.weakext\t", FILE); \ |
| assemble_name (FILE, NAME); \ |
| if (VALUE) \ |
| { \ |
| fputc (' ', FILE); \ |
| assemble_name (FILE, VALUE); \ |
| } \ |
| fputc ('\n', FILE); \ |
| } while (0) |
| |
| #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) |
| #undef UNIQUE_SECTION_P |
| #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL)) |
| #define UNIQUE_SECTION(DECL,RELOC) \ |
| do { \ |
| int len, size, sec; \ |
| char *name, *string, *prefix; \ |
| static char *prefixes[4][2] = { \ |
| { ".text.", ".gnu.linkonce.t." }, \ |
| { ".rodata.", ".gnu.linkonce.r." }, \ |
| { ".data.", ".gnu.linkonce.d." }, \ |
| { ".sdata.", ".gnu.linkonce.s." } \ |
| }; \ |
| \ |
| name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \ |
| size = int_size_in_bytes (TREE_TYPE (decl)); \ |
| \ |
| /* Determine the base section we are interested in: \ |
| 0=text, 1=rodata, 2=data, 3=sdata, [4=bss]. */ \ |
| if (TREE_CODE (DECL) == FUNCTION_DECL) \ |
| sec = 0; \ |
| else if (DECL_INITIAL (DECL) == 0 \ |
| || DECL_INITIAL (DECL) == error_mark_node) \ |
| sec = 2; \ |
| else if ((TARGET_EMBEDDED_PIC || TARGET_MIPS16) \ |
| && TREE_CODE (decl) == STRING_CST \ |
| && !flag_writable_strings) \ |
| { \ |
| /* For embedded position independent code, put constant strings \ |
| in the text section, because the data section is limited to \ |
| 64K in size. For mips16 code, put strings in the text \ |
| section so that a PC relative load instruction can be used to \ |
| get their address. */ \ |
| sec = 0; \ |
| } \ |
| else if (TARGET_EMBEDDED_DATA) \ |
| { \ |
| /* For embedded applications, always put an object in read-only data \ |
| if possible, in order to reduce RAM usage. */ \ |
| \ |
| if (DECL_READONLY_SECTION (DECL, RELOC)) \ |
| sec = 1; \ |
| else if (size > 0 && size <= mips_section_threshold) \ |
| sec = 3; \ |
| else \ |
| sec = 2; \ |
| } \ |
| else \ |
| { \ |
| /* For hosted applications, always put an object in small data if \ |
| possible, as this gives the best performance. */ \ |
| \ |
| if (size > 0 && size <= mips_section_threshold) \ |
| sec = 3; \ |
| else if (DECL_READONLY_SECTION (DECL, RELOC)) \ |
| sec = 1; \ |
| else \ |
| sec = 2; \ |
| } \ |
| \ |
| prefix = prefixes[sec][DECL_ONE_ONLY (DECL)]; \ |
| len = strlen (name) + strlen (prefix); \ |
| string = alloca (len + 1); \ |
| sprintf (string, "%s%s", prefix, name); \ |
| \ |
| DECL_SECTION_NAME (DECL) = build_string (len, string); \ |
| } while (0) |
| |
| /* Support the ctors/dtors and other sections. */ |
| |
| /* Define the names of and pseudo-ops used to switch to the .ctors and |
| .dtors sections. |
| |
| Note that we want to give these sections the SHF_WRITE attribute |
| because these sections will actually contain data (i.e. tables of |
| addresses of functions in the current root executable or shared library |
| file) and, in the case of a shared library, the relocatable addresses |
| will have to be properly resolved/relocated (and then written into) by |
| the dynamic linker when it actually attaches the given shared library |
| to the executing process. (Note that on SVR4, you may wish to use the |
| `-z text' option to the ELF linker, when building a shared library, as |
| an additional check that you are doing everything right. But if you do |
| use the `-z text' option when building a shared library, you will get |
| errors unless the .ctors and .dtors sections are marked as writable |
| via the SHF_WRITE attribute.) */ |
| |
| #define CTORS_SECTION_NAME ".ctors" |
| #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\"" |
| #define DTORS_SECTION_NAME ".dtors" |
| #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\"" |
| |
| /* There's no point providing a default definition of __CTOR_LIST__ |
| since people are expected either to use crtbegin.o, or an equivalent, |
| or provide their own definition. */ |
| #define CTOR_LISTS_DEFINED_EXTERNALLY |
| |
| /* A list of other sections which the compiler might be "in" at any |
| given time. */ |
| #undef EXTRA_SECTIONS |
| #define EXTRA_SECTIONS in_sdata, in_sbss, in_rdata, in_ctors, in_dtors |
| |
| #define INVOKE__main |
| |
| #undef EXTRA_SECTION_FUNCTIONS |
| #define EXTRA_SECTION_FUNCTIONS \ |
| SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \ |
| SECTION_FUNCTION_TEMPLATE(sbss_section, in_sbss, SBSS_SECTION_ASM_OP) \ |
| SECTION_FUNCTION_TEMPLATE(rdata_section, in_rdata, RDATA_SECTION_ASM_OP) \ |
| SECTION_FUNCTION_TEMPLATE(ctors_section, in_ctors, CTORS_SECTION_ASM_OP) \ |
| SECTION_FUNCTION_TEMPLATE(dtors_section, in_dtors, DTORS_SECTION_ASM_OP) |
| |
| #define SECTION_FUNCTION_TEMPLATE(FN, ENUM, OP) \ |
| void FN () \ |
| { \ |
| if (in_section != ENUM) \ |
| { \ |
| fprintf (asm_out_file, "%s\n", OP); \ |
| in_section = ENUM; \ |
| } \ |
| } |
| |
| |
| /* A C statement (sans semicolon) to output an element in the table of |
| global constructors. */ |
| #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \ |
| do { \ |
| ctors_section (); \ |
| fprintf (FILE, "\t%s\t", TARGET_LONG64 ? ".dword" : ".word"); \ |
| assemble_name (FILE, NAME); \ |
| fprintf (FILE, "\n"); \ |
| } while (0) |
| |
| |
| /* A C statement (sans semicolon) to output an element in the table of |
| global destructors. */ |
| #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \ |
| do { \ |
| dtors_section (); \ |
| fprintf (FILE, "\t%s\t", TARGET_LONG64 ? ".dword" : ".word"); \ |
| assemble_name (FILE, NAME); \ |
| fprintf (FILE, "\n"); \ |
| } while (0) |
| |
| #define CTOR_LIST_BEGIN \ |
| func_ptr __CTOR_LIST__ __attribute__((section(CTORS_SECTION_NAME))) = \ |
| (func_ptr) (-1) |
| |
| #define CTOR_LIST_END \ |
| func_ptr __CTOR_END__ __attribute__((section(CTORS_SECTION_NAME))) = \ |
| (func_ptr) 0 |
| |
| #define DTOR_LIST_BEGIN \ |
| func_ptr __DTOR_LIST__ __attribute__((section(DTORS_SECTION_NAME))) = \ |
| (func_ptr) (-1) |
| |
| #define DTOR_LIST_END \ |
| func_ptr __DTOR_END__ __attribute__((section(DTORS_SECTION_NAME))) = \ |
| (func_ptr) 0 |
| |
| /* Don't set the target flags, this is done by the linker script */ |
| #undef LIB_SPEC |
| #define LIB_SPEC "" |
| |
| #undef STARTFILE_SPEC |
| #define STARTFILE_SPEC "crtbegin%O%s %{!mno-crt0:crt0%O%s}" |
| |
| #undef ENDFILE_SPEC |
| #define ENDFILE_SPEC "crtend%O%s" |
