/* Definitions for Intel 386 running Linux with ELF format Copyright (C) 1994, 1995 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 /* Base i386 target machine definitions */ #include /* Use the i386 AT&T assembler syntax */ #include /* some common stuff */ #undef TARGET_VERSION #define TARGET_VERSION fprintf (stderr, " (i386 Linux/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 "-D__ELF__ -Dunix -Di386 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(i386) -Amachine(i386)" #undef CPP_SPEC #ifdef USE_GNULIBC_1 #if TARGET_CPU_DEFAULT == 2 #define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}" #else #define CPP_SPEC "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}" #endif #else /* not USE_GNULIBC_1 */ #define CPP_SPEC "%(cpp_cpu) %[cpp_cpu] %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}" #endif /* not USE_GNULIBC_1 */ #undef LIBGCC_SPEC #define LIBGCC_SPEC "-lgcc" #undef LIB_SPEC #ifdef USE_GNULIBC_1 #if 1 /* We no longer link with libc_p.a or libg.a by default. If you * want to profile or debug the Linux C library, please add * -lc_p or -ggdb to LDFLAGS at the link time, respectively. */ #define LIB_SPEC \ "%{!shared: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \ %{!ggdb:-lc} %{ggdb:-lg}}" #else #define LIB_SPEC \ "%{!shared: \ %{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \ %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}" #endif #else #define LIB_SPEC \ "%{!shared: %{mieee-fp:-lieee} %{pthread:-lpthread} \ %{profile:-lc_p} %{!profile: -lc}}" #endif /* not USE_GNULIBC_1 */ /* Provide a LINK_SPEC appropriate for Linux. Here we provide support for the special GCC options -static and -shared, which allow us to link things in one of these three modes by applying the appropriate combinations of options at link-time. We like to support here for as many of the other GNU linker options as possible. But I don't have the time to search for those flags. I am sure how to add support for -soname shared_object_name. H.J. I took out %{v:%{!V:-V}}. It is too much :-(. They can use -Wl,-V. When the -shared link option is used a final link is not being done. */ /* If ELF is the default format, we should not use /lib/elf. */ #undef LINK_SPEC #ifdef USE_GNULIBC_1 #ifndef LINUX_DEFAULT_ELF #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ %{!shared: \ %{!ibcs: \ %{!static: \ %{rdynamic:-export-dynamic} \ %{!dynamic-linker:-dynamic-linker /lib/elf/ld-linux.so.1} \ %{!rpath:-rpath /lib/elf/}} %{static:-static}}}" #else #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ %{!shared: \ %{!ibcs: \ %{!static: \ %{rdynamic:-export-dynamic} \ %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.1}} \ %{static:-static}}}" #endif #else /* not USE_GNULIBC_1 */ #define LINK_SPEC "-m elf_i386 %{shared:-shared} \ %{!shared: \ %{!ibcs: \ %{!static: \ %{rdynamic:-export-dynamic} \ %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2}} \ %{static:-static}}}" #endif /* not USE_GNULIBC_1 */ /* Get perform_* macros to build libgcc.a. */ #include "i386/perform.h"