/* Definitions of target machine for GNU compiler, for i386 NetBSD systems. Copyright (C) 1998 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ /* This is used on i386 platforms that use the ELF format. This was taken from the NetBSD/alpha configuration, and modified for NetBSD/i386 by Christos Zoulas */ /* Get generic i386 definitions. */ #include /* Get perform_* macros to build libgcc.a. */ #include /* Get generic NetBSD ELF definitions. We will override these if necessary. */ #define NETBSD_ELF #include #define OBJECT_FORMAT_ELF /* This goes away when the math-emulator is fixed */ #undef TARGET_DEFAULT #define TARGET_DEFAULT \ (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) /* * DBX stabs definitions. Same as Solaris and other i386 ELF platforms. */ #undef DBX_CONTIN_CHAR #define DBX_CONTIN_CHAR '?' /* When generating stabs debugging, use N_BINCL entries. */ #define DBX_USE_BINCL /* Make LBRAC and RBRAC addresses relative to the start of the function. The native Solaris stabs debugging format works this way, gdb expects it, and it reduces the number of relocation entries. */ #define DBX_BLOCKS_FUNCTION_RELATIVE 1 /* When using stabs, gcc2_compiled must be a stabs entry, not an ordinary symbol, or gdb won't see it. Furthermore, since gdb reads the input piecemeal, starting with each N_SO, it's a lot easier if the gcc2 flag symbol is *after* the N_SO rather than before it. So we emit an N_OPT stab there. */ #define ASM_IDENTIFY_GCC(FILE) \ do \ { \ if (write_symbols != DBX_DEBUG) \ fputs ("gcc2_compiled.:\n", FILE); \ } \ while (0) #define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \ do \ { \ if (write_symbols == DBX_DEBUG) \ fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \ } \ while (0) /* Like block addresses, stabs line numbers are relative to the current function. */ #define ASM_OUTPUT_SOURCE_LINE(file, line) \ do \ { \ static int sym_lineno = 1; \ fprintf (file, ".stabn 68,0,%d,.LM%d-", \ line, sym_lineno); \ assemble_name (file, \ XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\ fprintf (file, "\n.LM%d:\n", sym_lineno); \ sym_lineno += 1; \ } \ while (0) /* In order for relative line numbers to work, we must output the stabs entry for the function name first. */ #define DBX_FUNCTION_FIRST /* Generate a blank trailing N_SO to mark the end of the .o file, since we can't depend upon the linker to mark .o file boundaries with embedded stabs. (XXX do we need this?) */ #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ do \ { \ text_section (); \ fprintf (FILE, \ "\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO); \ } \ while (0) #undef ASM_FINAL_SPEC /* Names to predefine in the preprocessor for this target machine. XXX NetBSD, by convention, shouldn't do __alpha, but lots of applications expect it because that's what OSF/1 does. */ /* NetBSD Extension to GNU C: __KPRINTF_ATTRIBUTE__ */ #undef CPP_PREDEFINES #define CPP_PREDEFINES "-D__NetBSD__ -D__ELF__ -Asystem(unix) -Asystem(NetBSD) -Acpu(i386) -Amachine(i386)" /* Make gcc agree with */ #undef SIZE_TYPE #define SIZE_TYPE "unsigned int" #undef PTRDIFF_TYPE #define PTRDIFF_TYPE "int" #undef WCHAR_TYPE #define WCHAR_TYPE "int" #undef WCHAR_UNSIGNED #define WCHAR_UNSIGNED 0 #undef WCHAR_TYPE_SIZE #define WCHAR_TYPE_SIZE 32 /* Output assembler code to FILE to increment profiler label # LABELNO for profiling a function entry. Under NetBSD/i386, the assembler does nothing special with -pg. */ #undef ASM_APP_ON #define ASM_APP_ON "#APP\n" #undef ASM_APP_OFF #define ASM_APP_OFF "#NO_APP\n" #define bsd4_4 #undef HAS_INIT_SECTION #undef ASM_FILE_START #define ASM_FILE_START(FILE) \ { \ output_file_directive (FILE, main_input_filename); \ fprintf (FILE, "\t.version\t\"01.01\"\n"); \ } /* Provide a LINK_SPEC appropriate for a NetBSD/alpha ELF target. Only the linker emulation is i386-specific. The rest are common to all ELF targets, except for the name of the start function. */ #undef LINK_SPEC #define LINK_SPEC \ "-m elf_i386 \ %{assert*} %{R*} \ %{shared:-shared} \ %{!shared: \ -dc -dp \ %{!nostdlib:%{!r*:%{!e*:-e __start}}} \ %{!static: \ %{rdynamic:-export-dynamic} \ %{!dynamic-linker:-dynamic-linker /usr/libexec/ld.elf_so}} \ %{static:-static}}" #undef DEFAULT_VTABLE_THUNKS #define DEFAULT_VTABLE_THUNKS 1 /* Attach a special .ident directive to the end of the file to identify the version of GCC which compiled this code. The format of the .ident string is patterned after the ones produced by native svr4 C compilers. */ /* Output #ident as a .ident. */ /* 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" #undef ASM_OUTPUT_SKIP #define ASM_OUTPUT_SKIP(FILE,SIZE) \ fprintf (FILE, "\t%s\t%u\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. */ #define ALIGN_ASM_OP ".align" #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) \ ASM_OUTPUT_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) \ ASM_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 ".comm" #undef ASM_OUTPUT_ALIGN #define ASM_OUTPUT_ALIGN(FILE,LOG) \ if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1 << (LOG)) #undef ASM_OUTPUT_ALIGNED_COMMON #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ do { \ fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \ assemble_name ((FILE), (NAME)); \ fprintf ((FILE), ",%u,%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 ".local" #undef ASM_OUTPUT_ALIGNED_LOCAL #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ do { \ fprintf ((FILE), "\t%s\t", 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 32-bit word of data with a specific value in some section. */ #define INT_ASM_OP ".long" /* 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 ".ascii" /* Support const sections and the ctors and dtors sections for g++. Note that there appears to be two different ways to support const sections at the moment. You can either #define the symbol READONLY_DATA_SECTION (giving it some code which switches to the readonly data section) or else you can #define the symbols EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and SELECT_RTX_SECTION. We do both here just to be on the safe side. */ #define USE_CONST_SECTION 1 #define CONST_SECTION_ASM_OP ".section\t.rodata" /* Define the 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_ASM_OP ".section\t.ctors,\"aw\"" #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"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. */ #define INIT_SECTION_ASM_OP ".section\t.init" #define FINI_SECTION_ASM_OP ".section\t.fini" /* A default list of other sections which we might be "in" at any given time. For targets that use additional sections (e.g. .tdesc) you should override this definition in the target-specific file which includes this file. */ #undef EXTRA_SECTIONS #define EXTRA_SECTIONS in_const, in_ctors, in_dtors /* A default list of extra section function definitions. For targets that use additional sections (e.g. .tdesc) you should override this definition in the target-specific file which includes this file. */ #undef EXTRA_SECTION_FUNCTIONS #define EXTRA_SECTION_FUNCTIONS \ CONST_SECTION_FUNCTION \ CTORS_SECTION_FUNCTION \ DTORS_SECTION_FUNCTION #undef READONLY_DATA_SECTION #define READONLY_DATA_SECTION() const_section () extern void text_section (); #define CONST_SECTION_FUNCTION \ void \ const_section () \ { \ if (!USE_CONST_SECTION) \ text_section(); \ else if (in_section != in_const) \ { \ fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \ in_section = in_const; \ } \ } #define CTORS_SECTION_FUNCTION \ void \ ctors_section () \ { \ if (in_section != in_ctors) \ { \ fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \ in_section = in_ctors; \ } \ } #define DTORS_SECTION_FUNCTION \ void \ dtors_section () \ { \ if (in_section != in_dtors) \ { \ fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \ in_section = in_dtors; \ } \ } /* Switch into a generic section. This is currently only used to support section attributes. We make the section read-only and executable for a function decl, read-only for a const data decl, and writable for a non-const data decl. */ #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \ fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, \ (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \ (DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw") /* 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 ", INT_ASM_OP); \ 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 ", INT_ASM_OP); \ assemble_name (FILE, NAME); \ fprintf (FILE, "\n"); \ } while (0) /* A C statement or statements to switch to the appropriate section for output of DECL. DECL is either a `VAR_DECL' node or a constant of some sort. RELOC indicates whether forming the initial value of DECL requires link-time relocations. */ #define SELECT_SECTION(DECL,RELOC) \ { \ if (TREE_CODE (DECL) == STRING_CST) \ { \ if (! flag_writable_strings) \ const_section (); \ else \ data_section (); \ } \ else if (TREE_CODE (DECL) == VAR_DECL) \ { \ if ((flag_pic && RELOC) \ || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \ || !DECL_INITIAL (DECL) \ || (DECL_INITIAL (DECL) != error_mark_node \ && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \ data_section (); \ else \ const_section (); \ } \ else \ const_section (); \ } /* A C statement or statements to switch to the appropriate section for output of RTX in mode MODE. RTX is some kind of constant in RTL. The argument MODE is redundant except in the case of a `const_int' rtx. Currently, these always go into the const section. */ #undef SELECT_RTX_SECTION #define SELECT_RTX_SECTION(MODE,RTX) const_section() /* 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 ".type" #define SIZE_ASM_OP ".size" /* 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. */ #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ do { \ fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \ assemble_name (FILE, NAME); \ putc (',', FILE); \ fprintf (FILE, TYPE_OPERAND_FMT, "function"); \ putc ('\n', FILE); \ ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ ASM_OUTPUT_LABEL(FILE, NAME); \ } while (0) /* Write the extra assembler code needed to declare an object properly. */ #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ do { \ fprintf (FILE, "\t%s\t ", 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, "\t%s\t ", SIZE_ASM_OP); \ assemble_name (FILE, NAME); \ putc (',', FILE); \ fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \ int_size_in_bytes (TREE_TYPE (DECL))); \ fputc ('\n', FILE); \ } \ 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. */ #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ do { \ 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, "\t%s\t ", SIZE_ASM_OP); \ assemble_name (FILE, name); \ putc (',', FILE); \ fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \ int_size_in_bytes (TREE_TYPE (DECL))); \ fputc ('\n', FILE); \ } \ } while (0) /* This is how to declare the size of a function. */ #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ do { \ if (!flag_inhibit_size_directive) \ { \ char label[256]; \ static int labelno; \ labelno++; \ ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \ ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \ fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ assemble_name (FILE, (FNAME)); \ fprintf (FILE, ","); \ assemble_name (FILE, label); \ fprintf (FILE, "-"); \ assemble_name (FILE, (FNAME)); \ putc ('\n', FILE); \ } \ } while (0) /* This is how we tell the assembler that two symbols have the same value. */ #define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \ do { assemble_name(FILE, NAME1); \ fputs(" = ", FILE); \ assemble_name(FILE, NAME2); \ fputc('\n', FILE); } 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. */ #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 ".string" /* * We always use gas here, so we don't worry about ECOFF assembler problems. */ #undef TARGET_GAS #define TARGET_GAS (1) #if 0 #undef PREFERRED_DEBUGGING_TYPE #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG #endif /* The following macros are stolen from i386v4.h */ /* These have to be defined to get PIC code correct */ /* This is how to output an element of a case-vector that is relative. This is only used for PIC code. See comments by the `casesi' insn in i386.md for an explanation of the expression this outputs. */ #undef ASM_OUTPUT_ADDR_DIFF_ELT #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE) /* Indicate that jump tables go in the text section. This is necessary when compiling PIC code. */ #define JUMP_TABLES_IN_TEXT_SECTION 1 /* Default to pcc-struct-return, because this is the ELF abi and we don't care about compatibility with older gcc versions. */ #define DEFAULT_PCC_STRUCT_RETURN 1 /* Profiling routines, partially copied from i386/osfrose.h. */ /* Redefine this to use %eax instead of %edx. */ #undef FUNCTION_PROFILER #define FUNCTION_PROFILER(FILE, LABELNO) \ { \ if (flag_pic) \ { \ fprintf (FILE, "\tcall __mcount@PLT\n"); \ } \ else \ { \ fprintf (FILE, "\tcall __mcount\n"); \ } \ } /* Put relocations in the constant pool in the writable data section. */ #undef SELECT_RTX_SECTION #define SELECT_RTX_SECTION(MODE,RTX) \ { \ if (flag_pic && symbolic_operand (RTX)) \ data_section (); \ else \ readonly_data_section (); \ }