| /* elfos.h -- operating system specific defines to be used when |
| targeting GCC for some generic ELF system |
| Copyright (C) 1991-2020 Free Software Foundation, Inc. |
| Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com). |
| |
| This file is part of GCC. |
| |
| GCC 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 3, or (at your option) |
| any later version. |
| |
| GCC 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. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #define TARGET_OBJFMT_CPP_BUILTINS() \ |
| do \ |
| { \ |
| builtin_define ("__ELF__"); \ |
| } \ |
| while (0) |
| |
| /* Define a symbol indicating that we are using elfos.h. |
| Some CPU specific configuration files use this. */ |
| #define USING_ELFOS_H |
| |
| /* The prefix to add to user-visible assembler symbols. |
| |
| For ELF systems the convention is *not* to prepend a leading |
| underscore onto user-level symbol names. */ |
| |
| #undef USER_LABEL_PREFIX |
| #define USER_LABEL_PREFIX "" |
| |
| /* The biggest alignment supported by ELF in bits. 32-bit ELF |
| supports section alignment up to (0x80000000 * 8), while |
| 64-bit ELF supports (0x8000000000000000 * 8). If this macro |
| is not defined, the default is the largest alignment supported |
| by 32-bit ELF and representable on a 32-bit host. Use this |
| macro to limit the alignment which can be specified using |
| the `__attribute__ ((aligned (N)))' construct. */ |
| #ifndef MAX_OFILE_ALIGNMENT |
| #define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8) |
| #endif |
| |
| /* Use periods rather than dollar signs in special g++ assembler names. */ |
| |
| #define NO_DOLLAR_IN_LABEL |
| |
| /* Writing `int' for a bit-field forces int alignment for the structure. */ |
| |
| #ifndef PCC_BITFIELD_TYPE_MATTERS |
| #define PCC_BITFIELD_TYPE_MATTERS 1 |
| #endif |
| |
| /* All ELF targets can support DWARF-2. */ |
| |
| #define DWARF2_DEBUGGING_INFO 1 |
| |
| /* The GNU tools operate better with dwarf2, and it is required by some |
| psABI's. Since we don't have any native tools to be compatible with, |
| default to dwarf2. */ |
| |
| #ifndef PREFERRED_DEBUGGING_TYPE |
| #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG |
| #endif |
| |
| /* All SVR4 targets use the ELF object file format. */ |
| #define OBJECT_FORMAT_ELF |
| |
| |
| /* Output #ident as a .ident. */ |
| |
| #undef TARGET_ASM_OUTPUT_IDENT |
| #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive |
| |
| #undef SET_ASM_OP |
| #define SET_ASM_OP "\t.set\t" |
| |
| /* Most svr4 assemblers want a .file directive at the beginning of |
| their input file. */ |
| #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true |
| |
| /* This is how to allocate empty space in some section. The .zero |
| pseudo-op is used for this on most svr4 assemblers. */ |
| |
| #define SKIP_ASM_OP "\t.zero\t" |
| |
| #undef ASM_OUTPUT_SKIP |
| #define ASM_OUTPUT_SKIP(FILE, SIZE) \ |
| fprintf ((FILE), "%s" HOST_WIDE_INT_PRINT_UNSIGNED "\n",\ |
| SKIP_ASM_OP, (SIZE)) |
| |
| /* This is how to store into the string LABEL |
| the symbol_ref name of an internal numbered label where |
| PREFIX is the class of label and NUM is the number within the class. |
| This is suitable for output with `assemble_name'. |
| |
| For most svr4 systems, the convention is that any symbol which begins |
| with a period is not put into the linker symbol table by the assembler. */ |
| |
| #undef ASM_GENERATE_INTERNAL_LABEL |
| #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \ |
| do \ |
| { \ |
| char *__p; \ |
| (LABEL)[0] = '*'; \ |
| (LABEL)[1] = '.'; \ |
| __p = stpcpy (&(LABEL)[2], PREFIX); \ |
| sprint_ul (__p, (unsigned long) (NUM)); \ |
| } \ |
| while (0) |
| |
| /* Output the label which precedes a jumptable. Note that for all svr4 |
| systems where we actually generate jumptables (which is to say every |
| svr4 target except i386, where we use casesi instead) we put the jump- |
| tables into the .rodata section and since other stuff could have been |
| put into the .rodata section prior to any given jumptable, we have to |
| make sure that the location counter for the .rodata section gets pro- |
| perly re-aligned prior to the actual beginning of the jump table. */ |
| |
| #undef ALIGN_ASM_OP |
| #define ALIGN_ASM_OP "\t.align\t" |
| |
| #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL |
| #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \ |
| ASM_OUTPUT_ALIGN ((FILE), 2) |
| #endif |
| |
| #undef ASM_OUTPUT_CASE_LABEL |
| #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \ |
| do \ |
| { \ |
| ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE); \ |
| (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \ |
| } \ |
| while (0) |
| |
| /* The standard SVR4 assembler seems to require that certain builtin |
| library routines (e.g. .udiv) be explicitly declared as .globl |
| in each assembly file where they are referenced. */ |
| |
| #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \ |
| (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0)) |
| |
| /* This says how to output assembler code to declare an |
| uninitialized external linkage data object. Under SVR4, |
| the linker seems to want the alignment of data objects |
| to depend on their types. We do exactly that here. */ |
| |
| #define COMMON_ASM_OP "\t.comm\t" |
| |
| #undef ASM_OUTPUT_ALIGNED_COMMON |
| #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ |
| do \ |
| { \ |
| fprintf ((FILE), "%s", COMMON_ASM_OP); \ |
| assemble_name ((FILE), (NAME)); \ |
| fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", \ |
| (SIZE), (ALIGN) / BITS_PER_UNIT); \ |
| } \ |
| while (0) |
| |
| /* This says how to output assembler code to declare an |
| uninitialized internal linkage data object. Under SVR4, |
| the linker seems to want the alignment of data objects |
| to depend on their types. We do exactly that here. */ |
| |
| #define LOCAL_ASM_OP "\t.local\t" |
| |
| #undef ASM_OUTPUT_ALIGNED_LOCAL |
| #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ |
| do \ |
| { \ |
| fprintf ((FILE), "%s", LOCAL_ASM_OP); \ |
| assemble_name ((FILE), (NAME)); \ |
| fprintf ((FILE), "\n"); \ |
| ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \ |
| } \ |
| while (0) |
| |
| /* This is the pseudo-op used to generate a contiguous sequence of byte |
| values from a double-quoted string WITHOUT HAVING A TERMINATING NUL |
| AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */ |
| |
| #undef ASCII_DATA_ASM_OP |
| #define ASCII_DATA_ASM_OP "\t.ascii\t" |
| |
| /* Support a read-only data section. */ |
| #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata" |
| |
| /* On svr4, we *do* have support for the .init and .fini sections, and we |
| can put stuff in there to be executed before and after `main'. We let |
| crtstuff.c and other files know this by defining the following symbols. |
| The definitions say how to change sections to the .init and .fini |
| sections. This is the same for all known svr4 assemblers. */ |
| |
| #define INIT_SECTION_ASM_OP "\t.section\t.init" |
| #define FINI_SECTION_ASM_OP "\t.section\t.fini" |
| |
| /* Output assembly directive to move to the beginning of current section. */ |
| #ifdef HAVE_GAS_SUBSECTION_ORDERING |
| # define ASM_SECTION_START_OP "\t.subsection\t-1" |
| # define ASM_OUTPUT_SECTION_START(FILE) \ |
| fprintf ((FILE), "%s\n", ASM_SECTION_START_OP) |
| #endif |
| |
| #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) |
| |
| /* Switch into a generic section. */ |
| #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section |
| |
| #undef TARGET_ASM_SELECT_RTX_SECTION |
| #define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section |
| #undef TARGET_ASM_SELECT_SECTION |
| #define TARGET_ASM_SELECT_SECTION default_elf_select_section |
| #undef TARGET_HAVE_SWITCHABLE_BSS_SECTIONS |
| #define TARGET_HAVE_SWITCHABLE_BSS_SECTIONS true |
| |
| /* 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. */ |
| |
| #define TYPE_ASM_OP "\t.type\t" |
| #define SIZE_ASM_OP "\t.size\t" |
| |
| /* This is how we tell the assembler that a symbol is weak. */ |
| |
| #define ASM_WEAKEN_LABEL(FILE, NAME) \ |
| do \ |
| { \ |
| fputs ("\t.weak\t", (FILE)); \ |
| assemble_name ((FILE), (NAME)); \ |
| fputc ('\n', (FILE)); \ |
| } \ |
| while (0) |
| |
| #define ASM_OUTPUT_SYMVER_DIRECTIVE(FILE, NAME, NAME2) \ |
| do \ |
| { \ |
| fputs ("\t.symver\t", (FILE)); \ |
| assemble_name ((FILE), (NAME)); \ |
| fputs (", ", (FILE)); \ |
| assemble_name ((FILE), (NAME2)); \ |
| fputc ('\n', (FILE)); \ |
| } \ |
| 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" |
| |
| /* Write the extra assembler code needed to declare a function's result. |
| Most svr4 assemblers don't require any special declaration of the |
| result value, but there are exceptions. */ |
| |
| #ifndef ASM_DECLARE_RESULT |
| #define ASM_DECLARE_RESULT(FILE, RESULT) |
| #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 a function properly. |
| Some svr4 assemblers need to also have something extra said about the |
| function's return value. We allow for that here. */ |
| |
| #ifndef ASM_DECLARE_FUNCTION_NAME |
| #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ |
| do \ |
| { \ |
| ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ |
| ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ |
| ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \ |
| } \ |
| while (0) |
| #endif |
| |
| /* Write the extra assembler code needed to declare the name of a |
| cold function partition properly. Some svr4 assemblers need to also |
| have something extra said about the function's return value. We |
| allow for that here. */ |
| |
| #ifndef ASM_DECLARE_COLD_FUNCTION_NAME |
| #define ASM_DECLARE_COLD_FUNCTION_NAME(FILE, NAME, DECL) \ |
| do \ |
| { \ |
| ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ |
| ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ |
| ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \ |
| } \ |
| while (0) |
| #endif |
| |
| /* Write the extra assembler code needed to declare an object properly. */ |
| |
| #ifdef HAVE_GAS_GNU_UNIQUE_OBJECT |
| #define USE_GNU_UNIQUE_OBJECT flag_gnu_unique |
| #else |
| #define USE_GNU_UNIQUE_OBJECT 0 |
| #endif |
| |
| #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ |
| do \ |
| { \ |
| HOST_WIDE_INT size; \ |
| \ |
| /* For template static data member instantiations or \ |
| inline fn local statics and their guard variables, use \ |
| gnu_unique_object so that they will be combined even under \ |
| RTLD_LOCAL. Don't use gnu_unique_object for typeinfo, \ |
| vtables and other read-only artificial decls. */ \ |
| if (USE_GNU_UNIQUE_OBJECT && DECL_ONE_ONLY (DECL) \ |
| && (!DECL_ARTIFICIAL (DECL) || !TREE_READONLY (DECL))) \ |
| ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "gnu_unique_object"); \ |
| else \ |
| ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ |
| \ |
| size_directive_output = 0; \ |
| if (!flag_inhibit_size_directive \ |
| && (DECL) && DECL_SIZE (DECL)) \ |
| { \ |
| size_directive_output = 1; \ |
| size = tree_to_uhwi (DECL_SIZE_UNIT (DECL)); \ |
| ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ |
| } \ |
| \ |
| ASM_OUTPUT_LABEL (FILE, NAME); \ |
| } \ |
| 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); \ |
| HOST_WIDE_INT size; \ |
| \ |
| 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; \ |
| size = tree_to_uhwi (DECL_SIZE_UNIT (DECL)); \ |
| ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ |
| } \ |
| } \ |
| while (0) |
| |
| /* This is how to declare the size of a function. */ |
| #ifndef ASM_DECLARE_FUNCTION_SIZE |
| #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ |
| do \ |
| { \ |
| if (!flag_inhibit_size_directive) \ |
| ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \ |
| } \ |
| while (0) |
| #endif |
| |
| /* This is how to declare the size of a cold function partition. */ |
| #ifndef ASM_DECLARE_COLD_FUNCTION_SIZE |
| #define ASM_DECLARE_COLD_FUNCTION_SIZE(FILE, FNAME, DECL) \ |
| do \ |
| { \ |
| if (!flag_inhibit_size_directive) \ |
| ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \ |
| } \ |
| while (0) |
| #endif |
| |
| /* A table of bytes codes used by the ASM_OUTPUT_ASCII and |
| ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table |
| corresponds to a particular byte value [0..255]. For any |
| given byte value, if the value in the corresponding table |
| position is zero, the given character can be output directly. |
| If the table value is 1, the byte must be output as a \ooo |
| octal escape. If the tables value is anything else, then the |
| byte value should be output as a \ followed by the value |
| in the table. Note that we can use standard UN*X escape |
| sequences for many control characters, but we don't use |
| \a to represent BEL because some svr4 assemblers (e.g. on |
| the i386) don't know about that. Also, we don't use \v |
| since some versions of gas, such as 2.2 did not accept it. */ |
| |
| #define ELF_ASCII_ESCAPES \ |
| "\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ |
| \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ |
| \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\ |
| \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\ |
| \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ |
| \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ |
| \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ |
| \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1" |
| |
| /* Some svr4 assemblers have a limit on the number of characters which |
| can appear in the operand of a .string directive. If your assembler |
| has such a limitation, you should define STRING_LIMIT to reflect that |
| limit. Note that at least some svr4 assemblers have a limit on the |
| actual number of bytes in the double-quoted string, and that they |
| count each character in an escape sequence as one byte. Thus, an |
| escape sequence like \377 would count as four bytes. |
| |
| If your target assembler doesn't support the .string directive, you |
| should define this to zero. |
| */ |
| |
| #define ELF_STRING_LIMIT ((unsigned) 256) |
| |
| #define STRING_ASM_OP "\t.string\t" |
| |
| /* The routine used to output NUL terminated strings. We use a special |
| version of this for most svr4 targets because doing so makes the |
| generated assembly code more compact (and thus faster to assemble) |
| as well as more readable, especially for targets like the i386 |
| (where the only alternative is to output character sequences as |
| comma separated lists of numbers). */ |
| |
| #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \ |
| default_elf_asm_output_limited_string ((FILE), (STR)) |
| |
| /* The routine used to output sequences of byte values. We use a special |
| version of this for most svr4 targets because doing so makes the |
| generated assembly code more compact (and thus faster to assemble) |
| as well as more readable. Note that if we find subparts of the |
| character sequence which end with NUL (and which are shorter than |
| STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */ |
| |
| #undef ASM_OUTPUT_ASCII |
| #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \ |
| default_elf_asm_output_ascii ((FILE), (STR), (LENGTH)) |
| |
| /* Allow the use of the -frecord-gcc-switches switch via the |
| elf_record_gcc_switches function defined in varasm.c. */ |
| #undef TARGET_ASM_RECORD_GCC_SWITCHES |
| #define TARGET_ASM_RECORD_GCC_SWITCHES elf_record_gcc_switches |
| |
| /* A C statement (sans semicolon) to output to the stdio stream STREAM |
| any text necessary for declaring the name of an external symbol |
| named NAME which is referenced in this compilation but not defined. |
| It is needed to properly support non-default visibility. */ |
| |
| #ifndef ASM_OUTPUT_EXTERNAL |
| #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ |
| default_elf_asm_output_external (FILE, DECL, NAME) |
| #endif |
| |
| #undef TARGET_LIBC_HAS_FUNCTION |
| #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function |
