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Diffstat (limited to 'gcc/config/i386/rtemself.h')
| -rw-r--r-- | gcc/config/i386/rtemself.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/gcc/config/i386/rtemself.h b/gcc/config/i386/rtemself.h new file mode 100644 index 00000000000..6486102abdc --- /dev/null +++ b/gcc/config/i386/rtemself.h @@ -0,0 +1,169 @@ +/* Definitions for Intel 386 running Linux-based GNU systems with ELF format. + Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc. + Contributed by Eric Youngdale. + Modified for stabs-in-ELF by H.J. Lu. + +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, 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +#define LINUX_DEFAULT_ELF + +/* A lie, I guess, but the general idea behind linux/ELF is that we are + supposed to be outputting something that will assemble under SVr4. + This gets us pretty close. */ +#include <i386/i386.h> /* Base i386 target machine definitions */ +#include <i386/att.h> /* Use the i386 AT&T assembler syntax */ +#include <linux.h> /* some common stuff */ + +#undef TARGET_VERSION +#define TARGET_VERSION fprintf (stderr, " (i386 RTEMS with ELF)"); + +/* The svr4 ABI for the i386 says that records and unions are returned + in memory. */ +#undef DEFAULT_PCC_STRUCT_RETURN +#define DEFAULT_PCC_STRUCT_RETURN 1 + +/* 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, 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 + +/* Copy this from the svr4 specifications... */ +/* Define the register numbers to be used in Dwarf debugging information. + The SVR4 reference port C compiler uses the following register numbers + in its Dwarf output code: + 0 for %eax (gnu regno = 0) + 1 for %ecx (gnu regno = 2) + 2 for %edx (gnu regno = 1) + 3 for %ebx (gnu regno = 3) + 4 for %esp (gnu regno = 7) + 5 for %ebp (gnu regno = 6) + 6 for %esi (gnu regno = 4) + 7 for %edi (gnu regno = 5) + The following three DWARF register numbers are never generated by + the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4 + believes these numbers have these meanings. + 8 for %eip (no gnu equivalent) + 9 for %eflags (no gnu equivalent) + 10 for %trapno (no gnu equivalent) + It is not at all clear how we should number the FP stack registers + for the x86 architecture. If the version of SDB on x86/svr4 were + a bit less brain dead with respect to floating-point then we would + have a precedent to follow with respect to DWARF register numbers + for x86 FP registers, but the SDB on x86/svr4 is so completely + broken with respect to FP registers that it is hardly worth thinking + of it as something to strive for compatibility with. + The version of x86/svr4 SDB I have at the moment does (partially) + seem to believe that DWARF register number 11 is associated with + the x86 register %st(0), but that's about all. Higher DWARF + register numbers don't seem to be associated with anything in + particular, and even for DWARF regno 11, SDB only seems to under- + stand that it should say that a variable lives in %st(0) (when + asked via an `=' command) if we said it was in DWARF regno 11, + but SDB still prints garbage when asked for the value of the + variable in question (via a `/' command). + (Also note that the labels SDB prints for various FP stack regs + when doing an `x' command are all wrong.) + Note that these problems generally don't affect the native SVR4 + C compiler because it doesn't allow the use of -O with -g and + because when it is *not* optimizing, it allocates a memory + location for each floating-point variable, and the memory + location is what gets described in the DWARF AT_location + attribute for the variable in question. + Regardless of the severe mental illness of the x86/svr4 SDB, we + do something sensible here and we use the following DWARF + register numbers. Note that these are all stack-top-relative + numbers. + 11 for %st(0) (gnu regno = 8) + 12 for %st(1) (gnu regno = 9) + 13 for %st(2) (gnu regno = 10) + 14 for %st(3) (gnu regno = 11) + 15 for %st(4) (gnu regno = 12) + 16 for %st(5) (gnu regno = 13) + 17 for %st(6) (gnu regno = 14) + 18 for %st(7) (gnu regno = 15) +*/ +#undef DBX_REGISTER_NUMBER +#define DBX_REGISTER_NUMBER(n) \ +((n) == 0 ? 0 \ + : (n) == 1 ? 2 \ + : (n) == 2 ? 1 \ + : (n) == 3 ? 3 \ + : (n) == 4 ? 6 \ + : (n) == 5 ? 7 \ + : (n) == 6 ? 5 \ + : (n) == 7 ? 4 \ + : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \ + : (-1)) + +/* Output assembler code to FILE to increment profiler label # LABELNO + for profiling a function entry. */ + +#undef FUNCTION_PROFILER +#define FUNCTION_PROFILER(FILE, LABELNO) \ +{ \ + if (flag_pic) \ + { \ + fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n", \ + LPREFIX, (LABELNO)); \ + fprintf (FILE, "\tcall *mcount@GOT(%%ebx)\n"); \ + } \ + else \ + { \ + fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO)); \ + fprintf (FILE, "\tcall mcount\n"); \ + } \ +} + +#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 + +#undef CPP_PREDEFINES +#define CPP_PREDEFINES "-Di386 -Drtems -D__rtems__ \ + -Asystem(rtems) -Acpu(i386) -Amachine(i386)" + +/* Get perform_* macros to build libgcc.a. */ +#include "i386/perform.h" + +/* A C statement (sans semicolon) to output to the stdio stream + FILE the assembler definition of uninitialized global DECL named + NAME whose size is SIZE bytes and alignment is ALIGN bytes. + Try to use asm_output_aligned_bss to implement this macro. */ + +#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ + asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) + +#undef STARTFILE_SPEC +#define STARTFILE_SPEC "crt0.o%s" + +#undef ENDFILE_SPEC + |