258 lines
9.3 KiB
Plaintext
258 lines
9.3 KiB
Plaintext
/* Definitions for Intel 386 running FreeBSD with ELF format
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Copyright (C) 1996 Free Software Foundation, Inc.
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Contributed by Eric Youngdale.
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Modified for stabs-in-ELF by H.J. Lu.
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Adapted from GNU/Linux version by John Polstra.
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Continued development by David O'Brien <obrien@freebsd.org>
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#undef TARGET_VERSION
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#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)");
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/* The svr4 ABI for the i386 says that records and unions are returned
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in memory. */
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/* On FreeBSD, we do not. */
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#undef DEFAULT_PCC_STRUCT_RETURN
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#define DEFAULT_PCC_STRUCT_RETURN 0
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/* This gets defined in tm.h->linux.h->svr4.h, and keeps us from using
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libraries compiled with the native cc, so undef it. */
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#undef NO_DOLLAR_IN_LABEL
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/* Use more efficient ``thunks'' to implement C++ vtables. */
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#undef DEFAULT_VTABLE_THUNKS
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#define DEFAULT_VTABLE_THUNKS 2
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/* Override the default comment-starter of "/". */
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#undef ASM_COMMENT_START
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#define ASM_COMMENT_START "#"
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#undef ASM_APP_ON
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#define ASM_APP_ON "#APP\n"
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#undef ASM_APP_OFF
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#define ASM_APP_OFF "#NO_APP\n"
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#undef SET_ASM_OP
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#define SET_ASM_OP ".set"
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/* This is how to output an element of a case-vector that is relative.
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This is only used for PIC code. See comments by the `casesi' insn in
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i386.md for an explanation of the expression this outputs. */
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#undef ASM_OUTPUT_ADDR_DIFF_ELT
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#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
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fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
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/* Indicate that jump tables go in the text section. This is
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necessary when compiling PIC code. */
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#define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
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/* Use stabs instead of DWARF debug format. */
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#undef PREFERRED_DEBUGGING_TYPE
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#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
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/* Copy this from the svr4 specifications... */
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/* Define the register numbers to be used in Dwarf debugging information.
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The SVR4 reference port C compiler uses the following register numbers
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in its Dwarf output code:
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0 for %eax (gnu regno = 0)
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1 for %ecx (gnu regno = 2)
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2 for %edx (gnu regno = 1)
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3 for %ebx (gnu regno = 3)
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4 for %esp (gnu regno = 7)
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5 for %ebp (gnu regno = 6)
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6 for %esi (gnu regno = 4)
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7 for %edi (gnu regno = 5)
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The following three DWARF register numbers are never generated by
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the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4
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believes these numbers have these meanings.
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8 for %eip (no gnu equivalent)
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9 for %eflags (no gnu equivalent)
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10 for %trapno (no gnu equivalent)
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It is not at all clear how we should number the FP stack registers
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for the x86 architecture. If the version of SDB on x86/svr4 were
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a bit less brain dead with respect to floating-point then we would
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have a precedent to follow with respect to DWARF register numbers
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for x86 FP registers, but the SDB on x86/svr4 is so completely
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broken with respect to FP registers that it is hardly worth thinking
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of it as something to strive for compatibility with.
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The version of x86/svr4 SDB I have at the moment does (partially)
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seem to believe that DWARF register number 11 is associated with
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the x86 register %st(0), but that's about all. Higher DWARF
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register numbers don't seem to be associated with anything in
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particular, and even for DWARF regno 11, SDB only seems to under-
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stand that it should say that a variable lives in %st(0) (when
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asked via an `=' command) if we said it was in DWARF regno 11,
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but SDB still prints garbage when asked for the value of the
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variable in question (via a `/' command).
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(Also note that the labels SDB prints for various FP stack regs
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when doing an `x' command are all wrong.)
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Note that these problems generally don't affect the native SVR4
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C compiler because it doesn't allow the use of -O with -g and
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because when it is *not* optimizing, it allocates a memory
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location for each floating-point variable, and the memory
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location is what gets described in the DWARF AT_location
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attribute for the variable in question.
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Regardless of the severe mental illness of the x86/svr4 SDB, we
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do something sensible here and we use the following DWARF
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register numbers. Note that these are all stack-top-relative
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numbers.
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11 for %st(0) (gnu regno = 8)
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12 for %st(1) (gnu regno = 9)
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13 for %st(2) (gnu regno = 10)
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14 for %st(3) (gnu regno = 11)
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15 for %st(4) (gnu regno = 12)
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16 for %st(5) (gnu regno = 13)
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17 for %st(6) (gnu regno = 14)
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18 for %st(7) (gnu regno = 15)
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*/
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#undef DBX_REGISTER_NUMBER
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#define DBX_REGISTER_NUMBER(n) \
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((n) == 0 ? 0 \
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: (n) == 1 ? 2 \
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: (n) == 2 ? 1 \
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: (n) == 3 ? 3 \
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: (n) == 4 ? 6 \
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: (n) == 5 ? 7 \
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: (n) == 6 ? 5 \
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: (n) == 7 ? 4 \
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: ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \
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: (-1))
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/* Tell final.c that we don't need a label passed to mcount. */
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#undef FUNCTION_PROFILER
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#define FUNCTION_PROFILER(FILE, LABELNO) \
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{ \
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if (flag_pic) \
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fprintf (FILE, "\tcall *.mcount@GOT(%%ebx)\n"); \
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else \
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fprintf (FILE, "\tcall .mcount\n"); \
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}
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#undef SIZE_TYPE
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#define SIZE_TYPE "unsigned int"
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#undef PTRDIFF_TYPE
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#define PTRDIFF_TYPE "int"
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#undef WCHAR_TYPE
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#define WCHAR_TYPE "int"
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#undef WCHAR_UNSIGNED
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#define WCHAR_UNSIGNED 0
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#undef WCHAR_TYPE_SIZE
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#define WCHAR_TYPE_SIZE BITS_PER_WORD
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#undef CPP_PREDEFINES
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#define CPP_PREDEFINES "-Di386 -Dunix -D__ELF__ -D__FreeBSD__ -Asystem(unix) -Asystem(FreeBSD) -Acpu(i386) -Amachine(i386)"
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#undef CPP_SPEC
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#define CPP_SPEC "%(cpp_cpu) %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
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/* This defines which switch letters take arguments. On FreeBSD, most of
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the normal cases (defined in gcc.c) apply, and we also have -h* and
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-z* options (for the linker) (comming from svr4).
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We also have -R (alias --rpath), no -z, --soname (-h), --assert etc. */
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#undef SWITCH_TAKES_ARG
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#define SWITCH_TAKES_ARG(CHAR) \
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(DEFAULT_SWITCH_TAKES_ARG (CHAR) \
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|| (CHAR) == 'h' \
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|| (CHAR) == 'z' \
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|| (CHAR) == 'R')
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/* Provide a STARTFILE_SPEC appropriate for FreeBSD. Here we add
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the magical crtbegin.o file (see crtstuff.c) which provides part
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of the support for getting C++ file-scope static object constructed
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before entering `main'. */
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#undef STARTFILE_SPEC
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#define STARTFILE_SPEC \
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"%{!shared: \
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%{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
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%{!p:%{profile:gcrt1.o%s} \
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%{!profile:crt1.o%s}}}} \
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crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
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/* Provide a ENDFILE_SPEC appropriate for FreeBSD. Here we tack on
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the magical crtend.o file (see crtstuff.c) which provides part of
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the support for getting C++ file-scope static object constructed
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before entering `main', followed by a normal "finalizer" file,
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`crtn.o'. */
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#undef ENDFILE_SPEC
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#define ENDFILE_SPEC \
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"%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
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/* Provide a LIB_SPEC appropriate for FreeBSD. Just select the appropriate
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libc, depending on whether we're doing profiling or need threads support.
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(simular to the default, except no -lg, and no -p. */
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#undef LIB_SPEC
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#define LIB_SPEC "%{!shared: \
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%{!pg:%{!pthread:%{!kthread:-lc} \
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%{kthread:-lpthread -lc}} \
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%{pthread:-lc_r}} \
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%{pg:%{!pthread:%{!kthread:-lc_p} \
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%{kthread:-lpthread_p -lc_p}} \
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%{pthread:-lc_r_p}}}"
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/* Provide a LINK_SPEC appropriate for FreeBSD. Here we provide support
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for the special GCC options -static and -shared, which allow us to
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link things in one of these three modes by applying the appropriate
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combinations of options at link-time. We like to support here for
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as many of the other GNU linker options as possible. But I don't
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have the time to search for those flags. I am sure how to add
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support for -soname shared_object_name. H.J.
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I took out %{v:%{!V:-V}}. It is too much :-(. They can use
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-Wl,-V.
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When the -shared link option is used a final link is not being
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done. */
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#undef LINK_SPEC
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#define LINK_SPEC "-m elf_i386 \
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%{Wl,*:%*} \
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%{v:-V} \
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%{assert*} %{R*} %{rpath*} %{defsym*} \
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%{shared:-Bshareable %{h*} %{soname*}} \
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%{!shared: \
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%{!static: \
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%{rdynamic:-export-dynamic} \
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%{!dynamic-linker:-dynamic-linker /usr/libexec/ld-elf.so.1}} \
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%{static:-Bstatic}} \
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%{symbolic:-Bsymbolic}"
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/* A C statement to output to the stdio stream FILE an assembler
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command to advance the location counter to a multiple of 1<<LOG
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bytes if it is within MAX_SKIP bytes.
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This is used to align code labels according to Intel recommendations. */
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#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
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#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
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if ((LOG) != 0) {\
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if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
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else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
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}
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#endif
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