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Diffstat (limited to 'gcc/config/elfos.h')
| -rw-r--r-- | gcc/config/elfos.h | 531 |
1 files changed, 531 insertions, 0 deletions
diff --git a/gcc/config/elfos.h b/gcc/config/elfos.h new file mode 100644 index 000000000..e483216ef --- /dev/null +++ b/gcc/config/elfos.h @@ -0,0 +1,531 @@ +/* elfos.h -- operating system specific defines to be used when + targeting GCC for some generic ELF system + Copyright (C) 1991, 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004, + 2007, 2009, 2010 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. */ + +#define ASM_OUTPUT_IDENT(FILE, NAME) \ + fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME); + +#define IDENT_ASM_OP "\t.ident\t" + +#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 \ + { \ + sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (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) + +/* 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 an object properly. */ + +#ifdef HAVE_GAS_GNU_UNIQUE_OBJECT +#define USE_GNU_UNIQUE_OBJECT 1 +#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 = int_size_in_bytes (TREE_TYPE (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 = int_size_in_bytes (TREE_TYPE (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 + +/* 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 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 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) \ + do \ + { \ + register const unsigned char *_limited_str = \ + (const unsigned char *) (STR); \ + register unsigned ch; \ + \ + fprintf ((FILE), "%s\"", STRING_ASM_OP); \ + \ + for (; (ch = *_limited_str); _limited_str++) \ + { \ + register int escape; \ + \ + switch (escape = ESCAPES[ch]) \ + { \ + case 0: \ + putc (ch, (FILE)); \ + break; \ + case 1: \ + fprintf ((FILE), "\\%03o", ch); \ + break; \ + default: \ + putc ('\\', (FILE)); \ + putc (escape, (FILE)); \ + break; \ + } \ + } \ + \ + fprintf ((FILE), "\"\n"); \ + } \ + while (0) + +/* 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) \ + do \ + { \ + const unsigned char *_ascii_bytes = \ + (const unsigned char *) (STR); \ + const unsigned char *limit = _ascii_bytes + (LENGTH); \ + const unsigned char *last_null = NULL; \ + unsigned bytes_in_chunk = 0; \ + \ + for (; _ascii_bytes < limit; _ascii_bytes++) \ + { \ + const unsigned char *p; \ + \ + if (bytes_in_chunk >= 60) \ + { \ + fprintf ((FILE), "\"\n"); \ + bytes_in_chunk = 0; \ + } \ + \ + if (_ascii_bytes > last_null) \ + { \ + for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \ + continue; \ + last_null = p; \ + } \ + else \ + p = last_null; \ + \ + if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT) \ + { \ + if (bytes_in_chunk > 0) \ + { \ + fprintf ((FILE), "\"\n"); \ + bytes_in_chunk = 0; \ + } \ + \ + ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \ + _ascii_bytes = p; \ + } \ + else \ + { \ + register int escape; \ + register unsigned ch; \ + \ + if (bytes_in_chunk == 0) \ + fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP); \ + \ + switch (escape = ESCAPES[ch = *_ascii_bytes]) \ + { \ + case 0: \ + putc (ch, (FILE)); \ + bytes_in_chunk++; \ + break; \ + case 1: \ + fprintf ((FILE), "\\%03o", ch); \ + bytes_in_chunk += 4; \ + break; \ + default: \ + putc ('\\', (FILE)); \ + putc (escape, (FILE)); \ + bytes_in_chunk += 2; \ + break; \ + } \ + } \ + } \ + \ + if (bytes_in_chunk > 0) \ + fprintf ((FILE), "\"\n"); \ + } \ + while (0) + +/* 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 |