| /* 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, 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 (flag_pic) |
| |
| /* 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 |
| |