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- /* Definitions for Intel 386 running system V, using gas.
- Copyright (C) 1992 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. */
-
- #include "i386/gas.h"
-
- /* Add stuff that normally comes from i386/sysv3.h */
-
- /* longjmp may fail to restore the registers if called from the same
- function that called setjmp. To compensate, the compiler avoids
- putting variables in registers in functions that use both setjmp
- and longjmp. */
-
- #define NON_SAVING_SETJMP \
- (current_function_calls_setjmp && current_function_calls_longjmp)
-
- /* longjmp may fail to restore the stack pointer if the saved frame
- pointer is the same as the caller's frame pointer. Requiring a frame
- pointer in any function that calls setjmp or longjmp avoids this
- problem, unless setjmp and longjmp are called from the same function.
- Since a frame pointer will be required in such a function, it is OK
- that the stack pointer is not restored. */
-
- #undef FRAME_POINTER_REQUIRED
- #define FRAME_POINTER_REQUIRED \
- (current_function_calls_setjmp || current_function_calls_longjmp)
-
- /* Modify ASM_OUTPUT_LOCAL slightly to test -msvr3-shlib, adapted to gas */
- #undef ASM_OUTPUT_LOCAL
- #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
- do { \
- int align = exact_log2 (ROUNDED); \
- if (align > 2) align = 2; \
- if (TARGET_SVR3_SHLIB) \
- { \
- data_section (); \
- ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
- ASM_OUTPUT_LABEL ((FILE), (NAME)); \
- fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
- } \
- else \
- { \
- fputs (".lcomm ", (FILE)); \
- assemble_name ((FILE), (NAME)); \
- fprintf ((FILE), ",%u\n", (ROUNDED)); \
- } \
- } while (0)
-
- /* Add stuff that normally comes from i386/sysv3.h via svr3.h */
-
- /* Define the actual types of some ANSI-mandated types. These
- definitions should work for most SVR3 systems. */
-
- #undef SIZE_TYPE
- #define SIZE_TYPE "unsigned int"
-
- #undef PTRDIFF_TYPE
- #define PTRDIFF_TYPE "int"
-
- #undef WCHAR_TYPE
- #define WCHAR_TYPE "long int"
-
- #undef WCHAR_TYPE_SIZE
- #define WCHAR_TYPE_SIZE BITS_PER_WORD
-
- /* ??? This stuff is copied from config/svr3.h. In the future,
- this file should be rewritten to include config/svr3.h
- and override what isn't right. */
-
- /* 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.
- However, use of the const section is turned off by default
- unless the specific tm.h file turns it on by defining
- USE_CONST_SECTION as 1. */
-
- /* Define a few machine-specific details of the implementation of
- constructors.
-
- The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
- and CTOR_LIST_END to contribute to the .init section an instruction to
- push a word containing 0 (or some equivalent of that).
-
- Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */
-
- #define USE_CONST_SECTION 0
-
- #define INIT_SECTION_ASM_OP ".section\t.init"
- #define FINI_SECTION_ASM_OP ".section .fini,\"x\""
- #define CONST_SECTION_ASM_OP ".section\t.rodata, \"x\""
- #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP
- #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
-
- /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
- because they push on the stack. */
-
- #ifdef STACK_GROWS_DOWNWARD
-
- /* Constructor list on stack is in reverse order. Go to the end of the
- list and go backwards to call constructors in the right order. */
- #define DO_GLOBAL_CTORS_BODY \
- do { \
- func_ptr *p, *beg = alloca (0); \
- for (p = beg; *p; p++) \
- ; \
- while (p != beg) \
- (*--p) (); \
- } while (0)
-
- #else
-
- /* Constructor list on stack is in correct order. Just call them. */
- #define DO_GLOBAL_CTORS_BODY \
- do { \
- func_ptr *p, *beg = alloca (0); \
- for (p = beg; *p; ) \
- (*p++) (); \
- } while (0)
-
- #endif /* STACK_GROWS_DOWNWARD */
-
- /* Add extra sections .init and .fini, in addition to .bss from att386.h. */
-
- #undef EXTRA_SECTIONS
- #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini
-
- #undef EXTRA_SECTION_FUNCTIONS
- #define EXTRA_SECTION_FUNCTIONS \
- CONST_SECTION_FUNCTION \
- BSS_SECTION_FUNCTION \
- INIT_SECTION_FUNCTION \
- FINI_SECTION_FUNCTION
-
- #define BSS_SECTION_FUNCTION \
- void \
- bss_section () \
- { \
- if (in_section != in_bss) \
- { \
- fprintf (asm_out_file, "\t%s\n", BSS_SECTION_ASM_OP); \
- in_section = in_bss; \
- } \
- }
-
- #define INIT_SECTION_FUNCTION \
- void \
- init_section () \
- { \
- if (in_section != in_init) \
- { \
- fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \
- in_section = in_init; \
- } \
- }
-
- #define FINI_SECTION_FUNCTION \
- void \
- fini_section () \
- { \
- if (in_section != in_fini) \
- { \
- fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \
- in_section = in_fini; \
- } \
- }
-
- #define READONLY_DATA_SECTION() const_section ()
-
- #define CONST_SECTION_FUNCTION \
- void \
- const_section () \
- { \
- extern void text_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; \
- } \
- }
-
- /* The ctors and dtors sections are not normally put into use
- by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h,
- but it can't hurt to define these macros for whatever systems use them. */
- #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; \
- } \
- }
-
- /* This is machine-dependent
- because it needs to push something on the stack. */
- #undef ASM_OUTPUT_CONSTRUCTOR
-
- /* A C statement (sans semicolon) to output an element in the table of
- global destructors. */
- #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
- do { \
- fini_section (); \
- fprintf (FILE, "%s\t ", ASM_LONG); \
- 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 ((0 && RELOC) /* should be (flag_pic && RELOC) */ \
- || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (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. */
-
- #define SELECT_RTX_SECTION(MODE,RTX) const_section()
-
- /* This is copied from i386/sysv3.h. */
-
- /* Define a few machine-specific details of the implementation of
- constructors.
-
- The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
- and CTOR_LIST_END to contribute to the .init section an instruction to
- push a word containing 0 (or some equivalent of that).
-
- ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the
- constructor. */
-
- #undef INIT_SECTION_ASM_OP
- #define INIT_SECTION_ASM_OP ".section .init,\"x\""
-
- #define CTOR_LIST_BEGIN \
- asm (INIT_SECTION_ASM_OP); \
- asm ("pushl $0")
- #define CTOR_LIST_END CTOR_LIST_BEGIN
-
- #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
- do { \
- init_section (); \
- fprintf (FILE, "\tpushl $"); \
- assemble_name (FILE, NAME); \
- fprintf (FILE, "\n"); \
- } while (0)
-