gcc/config/pa/pa-linux.h

   1 /* Definitions for PA_RISC with ELF format
   2    Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC 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 GCC 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 GCC; 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         LINUX_TARGET_OS_CPP_BUILTINS();         \
  60         builtin_assert ("machine=bigendian");   \
  61     }                                           \
  62   while (0)
  63
  64 #undef CPP_SPEC
  65 #define CPP_SPEC "%{fPIC|fpic|fPIE|fpie:-D__PIC__ -D__pic__} %{posix:-D_POSIX_SOURCE}"
  66
  67 #undef  LIB_SPEC
  68 #define LIB_SPEC \
  69   "%{pthread:-lpthread} \
  70    %{shared:-lgcc -lc} \
  71    %{!shared:%{mieee-fp:-lieee} %{shared-libgcc:-lgcc} %{profile:-lc_p}%{!profile:-lc}}"
  72
  73 #undef ASM_SPEC
  74 #define ASM_SPEC \
  75   "%{v:-V} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  76
  77 /* Define this for shared library support because it isn't in the main
  78    linux.h file.  */
  79
  80 #undef LINK_SPEC
  81 #define LINK_SPEC "\
  82   %{shared:-shared} \
  83   %{!shared: \
  84     %{!static: \
  85       %{rdynamic:-export-dynamic} \
  86       %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
  87       %{static:-static}}"
  88
  89 /* glibc's profiling functions don't need gcc to allocate counters.  */
  90 #define NO_PROFILE_COUNTERS 1
  91
  92 /* Define the strings used for the special svr4 .type and .size directives.
  93    These strings generally do not vary from one system running svr4 to
  94    another, but if a given system (e.g. m88k running svr) needs to use
  95    different pseudo-op names for these, they may be overridden in the
  96    file which includes this one.  */
  97
  98 #undef STRING_ASM_OP
  99 #define STRING_ASM_OP   ".stringz"
 100
 101 #define TEXT_SECTION_ASM_OP "\t.text"
 102 #define DATA_SECTION_ASM_OP "\t.data"
 103 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 104
 105 #define TARGET_ASM_FILE_START pa_linux_file_start
 106
 107 /* We want local labels to start with period if made with asm_fprintf.  */
 108 #undef LOCAL_LABEL_PREFIX
 109 #define LOCAL_LABEL_PREFIX "."
 110
 111 /* Define these to generate the Linux/ELF/SysV style of internal
 112    labels all the time - i.e. to be compatible with
 113    ASM_GENERATE_INTERNAL_LABEL in <elfos.h>.  Compare these with the
 114    ones in pa.h and note the lack of dollar signs in these.  FIXME:
 115    shouldn't we fix pa.h to use ASM_GENERATE_INTERNAL_LABEL instead? */
 116
 117 #undef ASM_OUTPUT_ADDR_VEC_ELT
 118 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 119   if (TARGET_BIG_SWITCH)                                        \
 120     fprintf (FILE, "\t.word .L%d\n", VALUE);                    \
 121   else                                                          \
 122     fprintf (FILE, "\tb .L%d\n\tnop\n", VALUE)
 123
 124 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 125 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
 126   if (TARGET_BIG_SWITCH)                                        \
 127     fprintf (FILE, "\t.word .L%d-.L%d\n", VALUE, REL);          \
 128   else                                                          \
 129     fprintf (FILE, "\tb .L%d\n\tnop\n", VALUE)
 130
 131 /* Use the default.  */
 132 #undef ASM_OUTPUT_LABEL
 133
 134 /* NOTE: (*targetm.asm_out.internal_label)() is defined for us by elfos.h, and
 135    does what we want (i.e. uses colons).  It must be compatible with
 136    ASM_GENERATE_INTERNAL_LABEL(), so do not define it here.  */
 137
 138 /* Use the default.  */
 139 #undef TARGET_ASM_GLOBALIZE_LABEL
 140 /* Globalizing directive for a label.  */
 141 #define GLOBAL_ASM_OP ".globl "
 142
 143 /* FIXME: Hacked from the <elfos.h> one so that we avoid multiple
 144    labels in a function declaration (since pa.c seems determined to do
 145    it differently)  */
 146
 147 #undef ASM_DECLARE_FUNCTION_NAME
 148 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 149   do                                                            \
 150     {                                                           \
 151       ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
 152       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
 153     }                                                           \
 154   while (0)
 155
 156 /* As well as globalizing the label, we need to encode the label
 157    to ensure a plabel is generated in an indirect call.  */
 158
 159 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
 160 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)                  \
 161   do                                                            \
 162     {                                                           \
 163       if (!FUNCTION_NAME_P (XSTR (FUN, 0)))                     \
 164         hppa_encode_label (FUN);                                \
 165       (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0)); \
 166     }                                                           \
 167   while (0)
 168
 169 /* Linux always uses gas.  */
 170 #undef TARGET_GAS
 171 #define TARGET_GAS 1