/* Configuration for an OpenBSD i386 target. Copyright (C) 1999 Free Software Foundation, Inc. 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. */ /* Get generic OpenBSD definitions. */ #include /* This gets defined in tm.h->linux.h->svr4.h, and keeps us from using libraries compiled with the native cc, so undef it. */ #undef NO_DOLLAR_IN_LABEL /* Override the default comment-starter of "/". */ #undef ASM_COMMENT_START #define ASM_COMMENT_START "#" /* This goes away when the math-emulator is fixed */ #undef TARGET_DEFAULT #define TARGET_DEFAULT \ (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) /* Run-time target specifications */ #define CPP_PREDEFINES "-D__unix__ -D__ELF__ -D__i386__ -D__OpenBSD__ -Asystem(unix) -Asystem(OpenBSD) -Acpu(i386) -Amachine(i386)" /* As an elf system, we need crtbegin/crtend stuff. */ #undef STARTFILE_SPEC #define STARTFILE_SPEC "\ %{!shared: %{pg:gcrt0%O%s} %{!pg:%{p:gcrt0%O%s} %{!p:crt0%O%s}} \ crtbegin%O%s} %{shared:crtbeginS%O%s}" #undef ENDFILE_SPEC #define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}" /* Layout of source language data types. */ /* This must agree with */ #undef SIZE_TYPE #define SIZE_TYPE "long unsigned int" #undef PTRDIFF_TYPE #define PTRDIFF_TYPE "long int" #undef WCHAR_TYPE #define WCHAR_TYPE "int" #undef WCHAR_UNSIGNED #define WCHAR_UNSIGNED 0 #undef WCHAR_TYPE_SIZE #define WCHAR_TYPE_SIZE BITS_PER_WORD /* Assembler format: overall framework. */ #undef ASM_APP_ON #define ASM_APP_ON "#APP\n" #undef ASM_APP_OFF #define ASM_APP_OFF "#NO_APP\n" #undef SET_ASM_OP #define SET_ASM_OP ".set" /* The following macros were originally stolen from i386v4.h. These have to be defined to get PIC code correct. */ /* Assembler format: dispatch tables. */ /* 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) /* Use stabs instead of DWARF debug format. */ #undef PREFERRED_DEBUGGING_TYPE #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG /* 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)) /* Assembler format: sections. */ /* Indicate when jump tables go in the text section. This is necessary when compiling PIC code. */ #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic) /* Stack & calling: aggregate returns. */ /* Don't default to pcc-struct-return, because gcc is the only compiler, and we want to retain compatibility with older gcc versions. */ #define DEFAULT_PCC_STRUCT_RETURN 0 /* Assembler format: alignment output. */ #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ if ((LOG) != 0) {\ if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ } #endif /* Stack & calling: profiling. */ /* OpenBSD's profiler recovers all information from the stack pointer. The icky part is not here, but in machine/profile.h. */ #undef FUNCTION_PROFILER #define FUNCTION_PROFILER(FILE, LABELNO) \ fputs (flag_pic ? "\tcall __mcount@PLT\n": "\tcall __mcount\n", FILE); /* Assembler format: exception region output. */ /* All configurations that don't use elf must be explicit about not using dwarf unwind information. egcs doesn't try too hard to check internal configuration files... */ #define DWARF2_UNWIND_INFO 0 /* Assembler format: alignment output. */ /* Note that we pick up ASM_OUTPUT_MAX_SKIP_ALIGN from i386/gas.h */ /* Note that we pick up ASM_OUTPUT_MI_THUNK from unix.h. */ #undef LINK_SPEC #define LINK_SPEC \ "%{!shared:%{!nostdlib:%{!r*:%{!e*:-e __start}}}} \ %{shared:-shared} %{R*} \ %{static:-Bstatic} \ %{!static:-Bdynamic} \ %{assert*} \ %{!dynamic-linker:-dynamic-linker /usr/libexec/ld.so}"