/* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF. Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008 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 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. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see . */ #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 /* 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