gcc/config/pa/pa-linux.h

   1 /* Definitions for PA_RISC with ELF format
   2    Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 /* A C expression whose value is RTL representing the location of the
  23    incoming return address at the beginning of any function, before the
  24    prologue.  You only need to define this macro if you want to support
  25    call frame debugging information like that provided by DWARF 2.  */
  26 #define INCOMING_RETURN_ADDR_RTX (gen_rtx_REG (word_mode, 2))
  27 #define DWARF_FRAME_RETURN_COLUMN (DWARF_FRAME_REGNUM (2))
  28
  29 /* This macro chooses the encoding of pointers embedded in the exception
  30    handling sections.  If at all possible, this should be defined such
  31    that the exception handling section will not require dynamic relocations,
  32    and so may be read-only.
  33
  34    FIXME: We use DW_EH_PE_aligned to output a PLABEL constructor for
  35    global function pointers.  */
  36 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)                       \
  37   (CODE == 2 && GLOBAL ? DW_EH_PE_aligned : DW_EH_PE_absptr)
  38
  39 /* Handle special EH pointer encodings.  Absolute, pc-relative, and
  40    indirect are handled automatically.  Since pc-relative encoding is
  41    not possible on the PA and we don't have the infrastructure for
  42    data relative encoding, we use aligned plabels for global function
  43    pointers.  */
  44 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
  45   do {                                                                  \
  46     if (((ENCODING) & 0x0F) == DW_EH_PE_aligned)                        \
  47       {                                                                 \
  48         fputs (integer_asm_op (SIZE, FALSE), FILE);                     \
  49         fputs ("P%", FILE);                                             \
  50         assemble_name (FILE, XSTR (ADDR, 0));                           \
  51         goto DONE;                                                      \
  52       }                                                                 \
  53     } while (0)
  54
  55 #undef TARGET_OS_CPP_BUILTINS
  56 #define TARGET_OS_CPP_BUILTINS()                \
  57   do                                            \
  58     {                                           \
  59         builtin_define ("__gnu_linux__");       \
  60         builtin_define_std ("linux");           \
  61         builtin_define_std ("unix");            \
  62         builtin_assert ("machine=bigendian");   \
  63         builtin_assert ("system=posix");        \
  64         builtin_assert ("system=unix");         \
  65     }                                           \
  66   while (0)
  67
  68 #undef CPP_SPEC
  69 #define CPP_SPEC "%{fPIC|fpic|fPIE|fpie:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
  70
  71 #undef  LIB_SPEC
  72 #define LIB_SPEC \
  73   "%{pthread:-lpthread} \
  74    %{shared:-lgcc -lc} \
  75    %{!shared:%{mieee-fp:-lieee} %{shared-libgcc:-lgcc} %{profile:-lc_p}%{!profile:-lc}}"
  76
  77 #undef ASM_SPEC
  78 #define ASM_SPEC \
  79   "%{v:-V} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  80
  81 /* Define this for shared library support because it isn't in the main
  82    linux.h file.  */
  83
  84 #undef LINK_SPEC
  85 #define LINK_SPEC "\
  86   %{shared:-shared} \
  87   %{!shared: \
  88     %{!static: \
  89       %{rdynamic:-export-dynamic} \
  90       %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
  91       %{static:-static}}"
  92
  93 /* glibc's profiling functions don't need gcc to allocate counters.  */
  94 #define NO_PROFILE_COUNTERS 1
  95
  96 /* Define the strings used for the special svr4 .type and .size directives.
  97    These strings generally do not vary from one system running svr4 to
  98    another, but if a given system (e.g. m88k running svr) needs to use
  99    different pseudo-op names for these, they may be overridden in the
 100    file which includes this one.  */
 101
 102 #undef STRING_ASM_OP
 103 #define STRING_ASM_OP   ".stringz"
 104
 105 #define TEXT_SECTION_ASM_OP "\t.text"
 106 #define DATA_SECTION_ASM_OP "\t.data"
 107 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 108
 109 #define TARGET_ASM_FILE_START pa_linux_file_start
 110
 111 /* We want local labels to start with period if made with asm_fprintf.  */
 112 #undef LOCAL_LABEL_PREFIX
 113 #define LOCAL_LABEL_PREFIX "."
 114
 115 /* Define these to generate the Linux/ELF/SysV style of internal
 116    labels all the time - i.e. to be compatible with
 117    ASM_GENERATE_INTERNAL_LABEL in <elfos.h>.  Compare these with the
 118    ones in pa.h and note the lack of dollar signs in these.  FIXME:
 119    shouldn't we fix pa.h to use ASM_GENERATE_INTERNAL_LABEL instead? */
 120
 121 #undef ASM_OUTPUT_ADDR_VEC_ELT
 122 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 123   if (TARGET_BIG_SWITCH)                                        \
 124     fprintf (FILE, "\tstw %%r1,-16(%%r30)\n\tldil LR'.L%d,%%r1\n\tbe RR'.L%d(%%sr4,%%r1)\n\tldw -16(%%r30),%%r1\n", VALUE, VALUE);              \
 125   else                                                          \
 126     fprintf (FILE, "\tb .L%d\n\tnop\n", VALUE)
 127
 128 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 129 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
 130   if (TARGET_BIG_SWITCH)                                        \
 131     fprintf (FILE, "\tstw %%r1,-16(%%r30)\n\tldw T'.L%d(%%r19),%%r1\n\tbv %%r0(%%r1)\n\tldw -16(%%r30),%%r1\n", VALUE);                         \
 132   else                                                          \
 133     fprintf (FILE, "\tb .L%d\n\tnop\n", VALUE)
 134
 135 /* Use the default.  */
 136 #undef ASM_OUTPUT_LABEL
 137
 138 /* NOTE: (*targetm.asm_out.internal_label)() is defined for us by elfos.h, and
 139    does what we want (i.e. uses colons).  It must be compatible with
 140    ASM_GENERATE_INTERNAL_LABEL(), so do not define it here.  */
 141
 142 /* Use the default.  */
 143 #undef TARGET_ASM_GLOBALIZE_LABEL
 144 /* Globalizing directive for a label.  */
 145 #define GLOBAL_ASM_OP ".globl "
 146
 147 /* FIXME: Hacked from the <elfos.h> one so that we avoid multiple
 148    labels in a function declaration (since pa.c seems determined to do
 149    it differently)  */
 150
 151 #undef ASM_DECLARE_FUNCTION_NAME
 152 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 153   do                                                            \
 154     {                                                           \
 155       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
 156       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
 157     }                                                           \
 158   while (0)
 159
 160 /* As well as globalizing the label, we need to encode the label
 161    to ensure a plabel is generated in an indirect call.  */
 162
 163 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
 164 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)                  \
 165   do                                                            \
 166     {                                                           \
 167       if (!FUNCTION_NAME_P (XSTR (FUN, 0)))                     \
 168         hppa_encode_label (FUN);                                \
 169       (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0)); \
 170     }                                                           \
 171   while (0)
 172
 173 /* Linux always uses gas.  */
 174 #undef TARGET_GAS
 175 #define TARGET_GAS 1