| /* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF. |
| Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
| Free Software Foundation, Inc. |
| Contributed by Richard Henderson (rth@tamu.edu). |
| |
| 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 2, 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. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING. If not, write to |
| the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #undef OBJECT_FORMAT_COFF |
| #undef EXTENDED_COFF |
| #define OBJECT_FORMAT_ELF |
| |
| /* ??? Move all SDB stuff from alpha.h to osf.h. */ |
| #undef SDB_DEBUGGING_INFO |
| |
| #define DBX_DEBUGGING_INFO 1 |
| #define DWARF2_DEBUGGING_INFO 1 |
| |
| #undef PREFERRED_DEBUGGING_TYPE |
| #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG |
| |
| #undef ASM_FINAL_SPEC |
| |
| /* alpha/ doesn't use elfos.h for some reason. */ |
| #define TARGET_OBJFMT_CPP_BUILTINS() \ |
| do \ |
| { \ |
| builtin_define ("__ELF__"); \ |
| } \ |
| while (0) |
| |
| #undef CC1_SPEC |
| #define CC1_SPEC "%{G*}" |
| |
| #undef ASM_SPEC |
| #define ASM_SPEC "%{G*} %{relax:-relax} %{!gstabs*:-no-mdebug}%{gstabs*:-mdebug}" |
| |
| #undef IDENT_ASM_OP |
| #define IDENT_ASM_OP "\t.ident\t" |
| |
| /* Output #ident as a .ident. */ |
| #undef ASM_OUTPUT_IDENT |
| #define ASM_OUTPUT_IDENT(FILE, NAME) \ |
| fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME); |
| |
| /* This is how to allocate empty space in some section. The .zero |
| pseudo-op is used for this on most svr4 assemblers. */ |
| |
| #undef SKIP_ASM_OP |
| #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)) |
| |
| /* 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. */ |
| |
| #undef ASM_OUTPUT_EXTERNAL_LIBCALL |
| #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. */ |
| |
| #undef COMMON_ASM_OP |
| #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. */ |
| |
| #undef ASM_OUTPUT_ALIGNED_LOCAL |
| #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ |
| do { \ |
| if ((SIZE) <= g_switch_value) \ |
| switch_to_section (sbss_section); \ |
| else \ |
| switch_to_section (bss_section); \ |
| ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ |
| if (!flag_inhibit_size_directive) \ |
| ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \ |
| ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \ |
| ASM_OUTPUT_LABEL(FILE, NAME); \ |
| ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \ |
| } while (0) |
| |
| /* This says how to output assembler code to declare an |
| uninitialized external linkage data object. */ |
| |
| #undef ASM_OUTPUT_ALIGNED_BSS |
| #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ |
| do { \ |
| ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN); \ |
| } 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'. |
| |
| This value is really 2^63. Since gcc figures the alignment in bits, |
| we could only potentially get to 2^60 on suitable hosts. Due to other |
| considerations in varasm, we must restrict this to what fits in an int. */ |
| |
| #undef MAX_OFILE_ALIGNMENT |
| #define MAX_OFILE_ALIGNMENT \ |
| (1 << (HOST_BITS_PER_INT < 64 ? HOST_BITS_PER_INT - 2 : 62)) |
| |
| /* 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" |
| |
| #undef READONLY_DATA_SECTION_ASM_OP |
| #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata" |
| #undef BSS_SECTION_ASM_OP |
| #define BSS_SECTION_ASM_OP "\t.section\t.bss" |
| #undef SBSS_SECTION_ASM_OP |
| #define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\"" |
| #undef SDATA_SECTION_ASM_OP |
| #define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"aw\"" |
| |
| /* 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. */ |
| |
| #undef INIT_SECTION_ASM_OP |
| #define INIT_SECTION_ASM_OP "\t.section\t.init" |
| #undef FINI_SECTION_ASM_OP |
| #define FINI_SECTION_ASM_OP "\t.section\t.fini" |
| |
| #ifdef HAVE_GAS_SUBSECTION_ORDERING |
| |
| #define ASM_SECTION_START_OP "\t.subsection\t-1" |
| |
| /* Output assembly directive to move to the beginning of current section. */ |
| #define ASM_OUTPUT_SECTION_START(FILE) \ |
| fprintf ((FILE), "%s\n", ASM_SECTION_START_OP) |
| |
| #endif |
| |
| /* Switch into a generic section. */ |
| #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section |
| #define TARGET_ASM_SELECT_SECTION default_elf_select_section |
| |
| #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) |
| |
| /* 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 |
| #define TYPE_ASM_OP "\t.type\t" |
| #undef SIZE_ASM_OP |
| #define SIZE_ASM_OP "\t.size\t" |
| |
| /* This is how we tell the assembler that a symbol is weak. */ |
| |
| #undef ASM_WEAKEN_LABEL |
| #define ASM_WEAKEN_LABEL(FILE, NAME) \ |
| do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ |
| fputc ('\n', FILE); } while (0) |
| |
| /* This is how we tell the assembler that two symbols have the same value. */ |
| |
| #undef ASM_OUTPUT_DEF |
| #define ASM_OUTPUT_DEF(FILE, ALIAS, NAME) \ |
| do { \ |
| assemble_name(FILE, ALIAS); \ |
| fputs(" = ", FILE); \ |
| assemble_name(FILE, NAME); \ |
| fputc('\n', FILE); \ |
| } while (0) |
| |
| #undef ASM_OUTPUT_DEF_FROM_DECLS |
| #define ASM_OUTPUT_DEF_FROM_DECLS(FILE, DECL, TARGET) \ |
| do { \ |
| const char *alias = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ |
| const char *name = IDENTIFIER_POINTER (TARGET); \ |
| if (TREE_CODE (DECL) == FUNCTION_DECL) \ |
| { \ |
| fputc ('$', FILE); \ |
| assemble_name (FILE, alias); \ |
| fputs ("..ng = $", FILE); \ |
| assemble_name (FILE, name); \ |
| fputs ("..ng\n", FILE); \ |
| } \ |
| assemble_name(FILE, alias); \ |
| fputs(" = ", 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). */ |
| |
| #undef TYPE_OPERAND_FMT |
| #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 an object properly. */ |
| |
| #undef ASM_DECLARE_OBJECT_NAME |
| #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ |
| do { \ |
| HOST_WIDE_INT size; \ |
| ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ |
| size_directive_output = 0; \ |
| if (!flag_inhibit_size_directive \ |
| && DECL_SIZE (DECL) \ |
| && (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \ |
| { \ |
| size_directive_output = 1; \ |
| 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 = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \ |
| { \ |
| size_directive_output = 1; \ |
| ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ |
| } \ |
| } while (0) |
| |
| /* 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. */ |
| |
| #undef ESCAPES |
| #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. */ |
| |
| #undef STRING_LIMIT |
| #define STRING_LIMIT ((unsigned) 256) |
| #undef STRING_ASM_OP |
| #define STRING_ASM_OP "\t.string\t" |
| |
| /* GAS is the only Alpha/ELF assembler. */ |
| #undef TARGET_GAS |
| #define TARGET_GAS (1) |
| |
| /* Provide a STARTFILE_SPEC appropriate for ELF. Here we add the |
| (even more) magical crtbegin.o file which provides part of the |
| support for getting C++ file-scope static object constructed |
| before entering `main'. */ |
| |
| #undef STARTFILE_SPEC |
| #ifdef HAVE_LD_PIE |
| #define STARTFILE_SPEC \ |
| "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\ |
| crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}" |
| #else |
| #define STARTFILE_SPEC \ |
| "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\ |
| crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}" |
| #endif |
| |
| /* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the |
| magical crtend.o file which provides part of the support for |
| getting C++ file-scope static object constructed before entering |
| `main', followed by a normal ELF "finalizer" file, `crtn.o'. */ |
| |
| #undef ENDFILE_SPEC |
| #define ENDFILE_SPEC \ |
| "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ |
| %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s" |
| |
| /* We support #pragma. */ |
| #define HANDLE_SYSV_PRAGMA 1 |
| |
| /* Select a format to encode pointers in exception handling data. CODE |
| is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is |
| true if the symbol may be affected by dynamic relocations. |
| |
| Since application size is already constrained to <2GB by the form of |
| the ldgp relocation, we can use a 32-bit pc-relative relocation to |
| static data. Dynamic data is accessed indirectly to allow for read |
| only EH sections. */ |
| #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \ |
| (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4) |
| |
| /* If defined, a C statement to be executed just prior to the output of |
| assembler code for INSN. */ |
| #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \ |
| (alpha_this_literal_sequence_number = 0, \ |
| alpha_this_gpdisp_sequence_number = 0) |
| extern int alpha_this_literal_sequence_number; |
| extern int alpha_this_gpdisp_sequence_number; |
| |
| /* Since the bits of the _init and _fini function is spread across |
| many object files, each potentially with its own GP, we must assume |
| we need to load our GP. Further, the .init/.fini section can |
| easily be more than 4MB away from the function to call so we can't |
| use bsr. */ |
| #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ |
| asm (SECTION_OP "\n" \ |
| " br $29,1f\n" \ |
| "1: ldgp $29,0($29)\n" \ |
| " unop\n" \ |
| " jsr $26," USER_LABEL_PREFIX #FUNC "\n" \ |
| " .align 3\n" \ |
| " .previous"); |
| |
| /* If we have the capability create headers for efficient EH lookup. |
| As of Jan 2002, only glibc 2.2.4 can actually make use of this, but |
| I imagine that other systems will catch up. In the meantime, it |
| doesn't harm to make sure that the data exists to be used later. */ |
| #if defined(HAVE_LD_EH_FRAME_HDR) |
| #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} " |
| #endif |
