/* 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