466 lines
17 KiB
C
466 lines
17 KiB
C
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/* elfos.h -- operating system specific defines to be used when
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targeting GCC for some generic ELF system
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#define TARGET_OBJFMT_CPP_BUILTINS() \
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do \
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{ \
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builtin_define ("__ELF__"); \
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} \
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while (0)
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/* Define a symbol indicating that we are using elfos.h.
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Some CPU specific configuration files use this. */
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#define USING_ELFOS_H
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/* The prefix to add to user-visible assembler symbols.
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For ELF systems the convention is *not* to prepend a leading
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underscore onto user-level symbol names. */
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#undef USER_LABEL_PREFIX
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#define USER_LABEL_PREFIX ""
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/* The biggest alignment supported by ELF in bits. 32-bit ELF
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supports section alignment up to (0x80000000 * 8), while
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64-bit ELF supports (0x8000000000000000 * 8). If this macro
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is not defined, the default is the largest alignment supported
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by 32-bit ELF and representable on a 32-bit host. Use this
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macro to limit the alignment which can be specified using
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the `__attribute__ ((aligned (N)))' construct. */
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#ifndef MAX_OFILE_ALIGNMENT
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#define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
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#endif
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/* Use periods rather than dollar signs in special g++ assembler names. */
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#define NO_DOLLAR_IN_LABEL
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/* Writing `int' for a bit-field forces int alignment for the structure. */
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#ifndef PCC_BITFIELD_TYPE_MATTERS
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#define PCC_BITFIELD_TYPE_MATTERS 1
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#endif
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/* All ELF targets can support DWARF-2. */
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#define DWARF2_DEBUGGING_INFO 1
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/* The GNU tools operate better with dwarf2, and it is required by some
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psABI's. Since we don't have any native tools to be compatible with,
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default to dwarf2. */
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#ifndef PREFERRED_DEBUGGING_TYPE
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#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
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#endif
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/* All SVR4 targets use the ELF object file format. */
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#define OBJECT_FORMAT_ELF
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/* Output #ident as a .ident. */
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#undef TARGET_ASM_OUTPUT_IDENT
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#define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
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#undef SET_ASM_OP
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#define SET_ASM_OP "\t.set\t"
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/* Most svr4 assemblers want a .file directive at the beginning of
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their input file. */
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#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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/* This is how to allocate empty space in some section. The .zero
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pseudo-op is used for this on most svr4 assemblers. */
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#define SKIP_ASM_OP "\t.zero\t"
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#undef ASM_OUTPUT_SKIP
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#define ASM_OUTPUT_SKIP(FILE, SIZE) \
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fprintf ((FILE), "%s" HOST_WIDE_INT_PRINT_UNSIGNED "\n",\
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SKIP_ASM_OP, (SIZE))
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/* This is how to store into the string LABEL
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the symbol_ref name of an internal numbered label where
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PREFIX is the class of label and NUM is the number within the class.
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This is suitable for output with `assemble_name'.
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For most svr4 systems, the convention is that any symbol which begins
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with a period is not put into the linker symbol table by the assembler. */
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#undef ASM_GENERATE_INTERNAL_LABEL
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#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
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do \
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{ \
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char *__p; \
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(LABEL)[0] = '*'; \
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(LABEL)[1] = '.'; \
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__p = stpcpy (&(LABEL)[2], PREFIX); \
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sprint_ul (__p, (unsigned long) (NUM)); \
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} \
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while (0)
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/* Output the label which precedes a jumptable. Note that for all svr4
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systems where we actually generate jumptables (which is to say every
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svr4 target except i386, where we use casesi instead) we put the jump-
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tables into the .rodata section and since other stuff could have been
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put into the .rodata section prior to any given jumptable, we have to
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make sure that the location counter for the .rodata section gets pro-
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perly re-aligned prior to the actual beginning of the jump table. */
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#undef ALIGN_ASM_OP
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#define ALIGN_ASM_OP "\t.align\t"
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#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
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#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
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ASM_OUTPUT_ALIGN ((FILE), 2)
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#endif
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#undef ASM_OUTPUT_CASE_LABEL
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#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
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do \
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{ \
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ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE); \
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(*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \
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} \
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while (0)
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/* The standard SVR4 assembler seems to require that certain builtin
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library routines (e.g. .udiv) be explicitly declared as .globl
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in each assembly file where they are referenced. */
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#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
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(*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
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/* This says how to output assembler code to declare an
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uninitialized external linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#define COMMON_ASM_OP "\t.comm\t"
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#undef ASM_OUTPUT_ALIGNED_COMMON
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#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
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do \
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{ \
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fprintf ((FILE), "%s", COMMON_ASM_OP); \
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assemble_name ((FILE), (NAME)); \
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fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", \
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(SIZE), (ALIGN) / BITS_PER_UNIT); \
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} \
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while (0)
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/* This says how to output assembler code to declare an
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uninitialized internal linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#define LOCAL_ASM_OP "\t.local\t"
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#undef ASM_OUTPUT_ALIGNED_LOCAL
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#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
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do \
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{ \
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fprintf ((FILE), "%s", LOCAL_ASM_OP); \
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assemble_name ((FILE), (NAME)); \
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fprintf ((FILE), "\n"); \
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ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
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} \
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while (0)
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/* This is the pseudo-op used to generate a contiguous sequence of byte
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values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
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AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
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#undef ASCII_DATA_ASM_OP
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#define ASCII_DATA_ASM_OP "\t.ascii\t"
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/* Support a read-only data section. */
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#define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
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/* On svr4, we *do* have support for the .init and .fini sections, and we
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can put stuff in there to be executed before and after `main'. We let
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crtstuff.c and other files know this by defining the following symbols.
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The definitions say how to change sections to the .init and .fini
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sections. This is the same for all known svr4 assemblers. */
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#define INIT_SECTION_ASM_OP "\t.section\t.init"
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#define FINI_SECTION_ASM_OP "\t.section\t.fini"
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/* Output assembly directive to move to the beginning of current section. */
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#ifdef HAVE_GAS_SUBSECTION_ORDERING
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# define ASM_SECTION_START_OP "\t.subsection\t-1"
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# define ASM_OUTPUT_SECTION_START(FILE) \
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fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
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#endif
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#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
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/* Switch into a generic section. */
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#define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
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#undef TARGET_ASM_SELECT_RTX_SECTION
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#define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section
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#undef TARGET_ASM_SELECT_SECTION
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#define TARGET_ASM_SELECT_SECTION default_elf_select_section
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#undef TARGET_HAVE_SWITCHABLE_BSS_SECTIONS
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#define TARGET_HAVE_SWITCHABLE_BSS_SECTIONS true
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/* Define the strings used for the special svr4 .type and .size directives.
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These strings generally do not vary from one system running svr4 to
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another, but if a given system (e.g. m88k running svr) needs to use
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different pseudo-op names for these, they may be overridden in the
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file which includes this one. */
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#define TYPE_ASM_OP "\t.type\t"
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#define SIZE_ASM_OP "\t.size\t"
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/* This is how we tell the assembler that a symbol is weak. */
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#define ASM_WEAKEN_LABEL(FILE, NAME) \
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do \
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{ \
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fputs ("\t.weak\t", (FILE)); \
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assemble_name ((FILE), (NAME)); \
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fputc ('\n', (FILE)); \
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} \
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while (0)
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/* The following macro defines the format used to output the second
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operand of the .type assembler directive. Different svr4 assemblers
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expect various different forms for this operand. The one given here
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is just a default. You may need to override it in your machine-
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specific tm.h file (depending upon the particulars of your assembler). */
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#define TYPE_OPERAND_FMT "@%s"
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/* Write the extra assembler code needed to declare a function's result.
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Most svr4 assemblers don't require any special declaration of the
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result value, but there are exceptions. */
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#ifndef ASM_DECLARE_RESULT
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#define ASM_DECLARE_RESULT(FILE, RESULT)
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#endif
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/* These macros generate the special .type and .size directives which
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are used to set the corresponding fields of the linker symbol table
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entries in an ELF object file under SVR4. These macros also output
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the starting labels for the relevant functions/objects. */
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/* Write the extra assembler code needed to declare a function properly.
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Some svr4 assemblers need to also have something extra said about the
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function's return value. We allow for that here. */
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#ifndef ASM_DECLARE_FUNCTION_NAME
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#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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do \
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{ \
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ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
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ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
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ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \
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} \
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while (0)
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#endif
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/* Write the extra assembler code needed to declare the name of a
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cold function partition properly. Some svr4 assemblers need to also
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have something extra said about the function's return value. We
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allow for that here. */
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#ifndef ASM_DECLARE_COLD_FUNCTION_NAME
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#define ASM_DECLARE_COLD_FUNCTION_NAME(FILE, NAME, DECL) \
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do \
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{ \
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ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
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ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
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ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \
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} \
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while (0)
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#endif
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/* Write the extra assembler code needed to declare an object properly. */
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#ifdef HAVE_GAS_GNU_UNIQUE_OBJECT
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#define USE_GNU_UNIQUE_OBJECT flag_gnu_unique
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#else
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#define USE_GNU_UNIQUE_OBJECT 0
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#endif
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#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
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do \
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{ \
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HOST_WIDE_INT size; \
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\
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/* For template static data member instantiations or \
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inline fn local statics and their guard variables, use \
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gnu_unique_object so that they will be combined even under \
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RTLD_LOCAL. Don't use gnu_unique_object for typeinfo, \
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vtables and other read-only artificial decls. */ \
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if (USE_GNU_UNIQUE_OBJECT && DECL_ONE_ONLY (DECL) \
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&& (!DECL_ARTIFICIAL (DECL) || !TREE_READONLY (DECL))) \
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ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "gnu_unique_object"); \
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else \
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ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
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\
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size_directive_output = 0; \
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if (!flag_inhibit_size_directive \
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&& (DECL) && DECL_SIZE (DECL)) \
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{ \
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size_directive_output = 1; \
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size = tree_to_uhwi (DECL_SIZE_UNIT (DECL)); \
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ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
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} \
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\
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ASM_OUTPUT_LABEL (FILE, NAME); \
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} \
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while (0)
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/* Output the size directive for a decl in rest_of_decl_compilation
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in the case where we did not do so before the initializer.
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Once we find the error_mark_node, we know that the value of
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size_directive_output was set
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by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
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#undef ASM_FINISH_DECLARE_OBJECT
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#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
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do \
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{ \
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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 = tree_to_uhwi (DECL_SIZE_UNIT (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
|
||
|
|
|
||
|
|
/* This is how to declare the size of a cold function partition. */
|
||
|
|
#ifndef ASM_DECLARE_COLD_FUNCTION_SIZE
|
||
|
|
#define ASM_DECLARE_COLD_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 ELF_ASCII_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 ELF_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) \
|
||
|
|
default_elf_asm_output_limited_string ((FILE), (STR))
|
||
|
|
|
||
|
|
/* 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) \
|
||
|
|
default_elf_asm_output_ascii ((FILE), (STR), (LENGTH))
|
||
|
|
|
||
|
|
/* 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
|
||
|
|
|
||
|
|
#undef TARGET_LIBC_HAS_FUNCTION
|
||
|
|
#define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
|