$NetBSD: patch-ag,v 1.1 1999/02/14 10:12:03 mrg Exp $ Index: gcc/config/i386/netbsd-elf.h *** /dev/null Sun Feb 14 16:47:33 1999 --- gcc/config/i386/netbsd-elf.h Sun Feb 14 19:03:37 1999 *************** *** 0 **** --- 1,597 ---- + /* 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. */ + + /* This goes away when the math-emulator is fixed */ + #define TARGET_CPU_DEFAULT 0400 /* TARGET_NO_FANCY_MATH_387 */ + + #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 is BSD, so it wants DBX format. */ + + #if 0 + #define DBX_DEBUGGING_INFO + + /* This is the char to use for continuation (in case we need to turn + continuation back on). */ + + #define DBX_CONTIN_CHAR '?' + #endif + + #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 "\ + -Di386 -D__NetBSD__ -D__ELF__ -D__KPRINTF_ATTRIBUTE__ \ + -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 (); \ + }