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 /* Use DWARF2 debugging info and unwind.  */
  22 #undef PREFERRED_DEBUGGING_TYPE
  23 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  24 #define DWARF2_ASM_LINE_DEBUG_INFO 1
  25 #define DWARF2_UNWIND_INFO 1
  26
  27 /* A C expression whose value is RTL representing the location of the
  28    incoming return address at the beginning of any function, before the
  29    prologue.  You only need to define this macro if you want to support
  30    call frame debugging information like that provided by DWARF 2.  */
  31 #define INCOMING_RETURN_ADDR_RTX (gen_rtx_REG (word_mode, 2))
  32 #define DWARF_FRAME_RETURN_COLUMN (DWARF_FRAME_REGNUM (2))
  33
  34 /* This macro chooses the encoding of pointers embedded in the exception
  35    handling sections.  If at all possible, this should be defined such
  36    that the exception handling section will not require dynamic relocations,
  37    and so may be read-only.
  38
  39    FIXME: We use DW_EH_PE_aligned to output a PLABEL constructor for
  40    global function pointers.  */
  41 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)                       \
  42   (CODE == 2 && GLOBAL ? DW_EH_PE_aligned : DW_EH_PE_absptr)
  43
  44 /* Handle special EH pointer encodings.  Absolute, pc-relative, and
  45    indirect are handled automatically.  Since pc-relative encoding is
  46    not possible on the PA and we don't have the infrastructure for
  47    data relative encoding, we use aligned plabels for global function
  48    pointers.  */
  49 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
  50   do {                                                                  \
  51     if (((ENCODING) & 0x0F) == DW_EH_PE_aligned)                        \
  52       {                                                                 \
  53         fputs (integer_asm_op (SIZE, FALSE), FILE);                     \
  54         fputs ("P%", FILE);                                             \
  55         assemble_name (FILE, XSTR (ADDR, 0));                           \
  56         goto DONE;                                                      \
  57       }                                                                 \
  58     } while (0)
  59
  60 #undef CPP_PREDEFINES
  61 #define CPP_PREDEFINES "-D__ELF__ -Dunix -D__hppa__ -D__gnu_linux__ -Dlinux -Asystem=unix -Asystem=posix -Acpu=hppa -Amachine=hppa -Amachine=bigendian"
  62
  63 #undef  LIB_SPEC
  64 #define LIB_SPEC \
  65   "%{shared: -lgcc -lc} \
  66    %{!shared: %{mieee-fp:-lieee} %{pthread:-lpthread} \
  67         %{shared-libgcc: -lgcc} %{profile:-lc_p} %{!profile: -lc}}"
  68
  69 #undef ASM_SPEC
  70 #define ASM_SPEC \
  71   "%{v:-V} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  72
  73 /* Define this for shared library support because it isn't in the main
  74    linux.h file.  */
  75
  76 #undef LINK_SPEC
  77 #define LINK_SPEC "\
  78   %{shared:-shared} \
  79   %{!shared: \
  80     %{!static: \
  81       %{rdynamic:-export-dynamic} \
  82       %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}} \
  83       %{static:-static}}"
  84
  85 /* Sibcalls, stubs, and elf sections don't play well.  */
  86 #undef FUNCTION_OK_FOR_SIBCALL
  87 #define FUNCTION_OK_FOR_SIBCALL(x) 0
  88
  89 /* glibc's profiling functions don't need gcc to allocate counters.  */
  90 #define NO_PROFILE_COUNTERS 1
  91
  92 /* Put plabels into the data section so we can relocate them.  */
  93 #undef SELECT_RTX_SECTION
  94 #define SELECT_RTX_SECTION(MODE,RTX,ALIGN)      \
  95   if (flag_pic && function_label_operand (RTX, MODE))   \
  96     data_section ();                                    \
  97   else                                                  \
  98     readonly_data_section ();
  99
 100 /* Define the strings used for the special svr4 .type and .size directives.
 101    These strings generally do not vary from one system running svr4 to
 102    another, but if a given system (e.g. m88k running svr) needs to use
 103    different pseudo-op names for these, they may be overridden in the
 104    file which includes this one.  */
 105
 106 #undef STRING_ASM_OP
 107 #define STRING_ASM_OP   ".stringz"
 108
 109 #define TEXT_SECTION_ASM_OP "\t.text"
 110 #define DATA_SECTION_ASM_OP "\t.data"
 111 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 112
 113 /* Output at beginning of assembler file.  We override the definition
 114    from <linux.h> so that we can get the proper .LEVEL directive.  */
 115 #undef ASM_FILE_START
 116 #define ASM_FILE_START(FILE) \
 117   do                                                            \
 118     {                                                           \
 119       if (write_symbols != NO_DEBUG)                            \
 120         {                                                       \
 121           output_file_directive (FILE, main_input_filename);    \
 122           fputs ("\t.version\t\"01.01\"\n", FILE);              \
 123         }                                                       \
 124       if (TARGET_64BIT)                                         \
 125         fputs("\t.LEVEL 2.0w\n", FILE);                         \
 126       else if (TARGET_PA_20)                                    \
 127         fputs("\t.LEVEL 2.0\n", FILE);                          \
 128       else if (TARGET_PA_11)                                    \
 129         fputs("\t.LEVEL 1.1\n", FILE);                          \
 130       else                                                      \
 131         fputs("\t.LEVEL 1.0\n", FILE);                          \
 132       if (profile_flag)                                         \
 133         fputs ("\t.IMPORT _mcount, CODE\n", FILE);              \
 134     }                                                           \
 135    while (0)
 136
 137 /* Output a definition */
 138 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
 139   do                                                            \
 140     {                                                           \
 141       fprintf ((FILE), "\t%s\t", SET_ASM_OP);                   \
 142       assemble_name (FILE, LABEL1);                             \
 143       fprintf (FILE, ",");                                      \
 144       assemble_name (FILE, LABEL2);                             \
 145       fprintf (FILE, "\n");                                     \
 146     }                                                           \
 147   while (0)
 148
 149 /* We want local labels to start with period if made with asm_fprintf.  */
 150 #undef LOCAL_LABEL_PREFIX
 151 #define LOCAL_LABEL_PREFIX "."
 152
 153 /* Define these to generate the Linux/ELF/SysV style of internal
 154    labels all the time - i.e. to be compatible with
 155    ASM_GENERATE_INTERNAL_LABEL in <elfos.h>.  Compare these with the
 156    ones in pa.h and note the lack of dollar signs in these.  FIXME:
 157    shouldn't we fix pa.h to use ASM_GENERATE_INTERNAL_LABEL instead? */
 158
 159 #undef ASM_OUTPUT_ADDR_VEC_ELT
 160 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 161   if (TARGET_BIG_SWITCH)                                        \
 162     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);              \
 163   else                                                          \
 164     fprintf (FILE, "\tb .L%d\n\tnop\n", VALUE)
 165
 166 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 167 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
 168   if (TARGET_BIG_SWITCH)                                        \
 169     fprintf (FILE, "\tstw %%r1,-16(%%r30)\n\tldw T'.L%d(%%r19),%%r1\n\tbv %%r0(%%r1)\n\tldw -16(%%r30),%%r1\n", VALUE);                         \
 170   else                                                          \
 171     fprintf (FILE, "\tb .L%d\n\tnop\n", VALUE)
 172
 173 /* This is how to output the definition of a user-level label named NAME,
 174    such as the label on a static function or variable NAME.  */
 175
 176 #undef ASM_OUTPUT_LABEL
 177 #define ASM_OUTPUT_LABEL(FILE, NAME) \
 178   do                                                            \
 179     {                                                           \
 180       assemble_name (FILE, NAME);                               \
 181       fputs (":\n", FILE);                                      \
 182     }                                                           \
 183   while (0)
 184
 185 /* NOTE: ASM_OUTPUT_INTERNAL_LABEL() is defined for us by elfos.h, and
 186    does what we want (i.e. uses colons).  It must be compatible with
 187    ASM_GENERATE_INTERNAL_LABEL(), so do not define it here.  */
 188
 189 #undef ASM_GLOBALIZE_LABEL
 190 #define ASM_GLOBALIZE_LABEL(FILE, NAME) \
 191   (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
 192
 193 /* FIXME: Hacked from the <elfos.h> one so that we avoid multiple
 194    labels in a function declaration (since pa.c seems determined to do
 195    it differently)  */
 196
 197 #undef ASM_DECLARE_FUNCTION_NAME
 198 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 199   do                                                            \
 200     {                                                           \
 201       fprintf (FILE, "\t%s\t ", TYPE_ASM_OP);                   \
 202       assemble_name (FILE, NAME);                               \
 203       putc (',', FILE);                                         \
 204       fprintf (FILE, TYPE_OPERAND_FMT, "function");             \
 205       putc ('\n', FILE);                                        \
 206       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
 207     }                                                           \
 208   while (0)
 209
 210 /* Linux always uses gas.  */
 211 #undef TARGET_GAS
 212 #define TARGET_GAS 1