gcc/config/ia64/sysv4.h

   1 /* Override definitions in elfos.h/svr4.h to be correct for IA64.  */
   2
   3 /* We want DWARF2 as specified by the IA64 ABI.  */
   4 #undef PREFERRED_DEBUGGING_TYPE
   5 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
   6
   7 /* Stabs does not work properly for 64-bit targets.  */
   8 #undef DBX_DEBUGGING_INFO
   9
  10 /* Various pseudo-ops for which the Intel assembler uses non-standard
  11    definitions.  */
  12
  13 #undef STRING_ASM_OP
  14 #define STRING_ASM_OP "\tstringz\t"
  15
  16 #undef SKIP_ASM_OP
  17 #define SKIP_ASM_OP "\t.skip\t"
  18
  19 #undef COMMON_ASM_OP
  20 #define COMMON_ASM_OP "\t.common\t"
  21
  22 #undef ASCII_DATA_ASM_OP
  23 #define ASCII_DATA_ASM_OP "\tstring\t"
  24
  25 /* ia64-specific options for gas
  26    ??? ia64 gas doesn't accept standard svr4 assembler options?  */
  27 #undef ASM_SPEC
  28 #define ASM_SPEC "-x %{mconstant-gp} %{mauto-pic} %(asm_extra)"
  29
  30 /* ??? Unfortunately, .lcomm doesn't work, because it puts things in either
  31    .bss or .sbss, and we can't control the decision of which is used.  When
  32    I use .lcomm, I get a cryptic "Section group has no member" error from
  33    the Intel simulator.  So we must explicitly put variables in .bss
  34    instead.  This matters only if we care about the Intel assembler.  */
  35
  36 /* This is asm_output_aligned_bss from varasm.c without the ASM_GLOBALIZE_LABEL
  37    call at the beginning.  */
  38
  39 /* This is for final.c, because it is used by ASM_DECLARE_OBJECT_NAME.  */
  40 extern int size_directive_output;
  41
  42 #undef ASM_OUTPUT_ALIGNED_LOCAL
  43 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
  44 do {                                                                    \
  45   if ((DECL)                                                            \
  46       && XSTR (XEXP (DECL_RTL (DECL), 0), 0)[0] == SDATA_NAME_FLAG_CHAR) \
  47     sbss_section ();                                                    \
  48   else                                                                  \
  49     bss_section ();                                                     \
  50   ASM_OUTPUT_ALIGN (FILE, floor_log2 ((ALIGN) / BITS_PER_UNIT));        \
  51   ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                           \
  52   ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                              \
  53 } while (0)
  54
  55 /* The # tells the Intel assembler that this is not a register name.
  56    However, we can't emit the # in a label definition, so we set a variable
  57    in ASM_OUTPUT_LABEL to control whether we want the postfix here or not.
  58    We append the # to the label name, but since NAME can be an expression
  59    we have to scan it for a non-label character and insert the # there.  */
  60
  61 #undef ASM_OUTPUT_LABELREF
  62 #define ASM_OUTPUT_LABELREF(STREAM, NAME)       \
  63 do {                                            \
  64   const char *name_ = NAME;                     \
  65   if (*name_ == SDATA_NAME_FLAG_CHAR)           \
  66     name_++;                                    \
  67   if (*name_ == '*')                            \
  68     name_++;                                    \
  69   else                                          \
  70     fputs (user_label_prefix, STREAM);          \
  71   fputs (name_, STREAM);                        \
  72   if (!ia64_asm_output_label)                   \
  73     fputc ('#', STREAM);                        \
  74 } while (0)
  75
  76 /* Intel assembler requires both flags and type if declaring a non-predefined
  77    section.  */
  78 #undef INIT_SECTION_ASM_OP
  79 #define INIT_SECTION_ASM_OP     "\t.section\t.init,\"ax\",\"progbits\""
  80 #undef FINI_SECTION_ASM_OP
  81 #define FINI_SECTION_ASM_OP     "\t.section\t.fini,\"ax\",\"progbits\""
  82
  83 /* svr4.h undefines this, so we need to define it here.  */
  84 #define DBX_REGISTER_NUMBER(REGNO) \
  85   ia64_dbx_register_number(REGNO)
  86
  87 /* Things that svr4.h defines to the wrong type, because it assumes 32 bit
  88    ints and 32 bit longs.  */
  89
  90 #undef SIZE_TYPE
  91 #define SIZE_TYPE "long unsigned int"
  92
  93 #undef PTRDIFF_TYPE
  94 #define PTRDIFF_TYPE "long int"
  95
  96 #undef WCHAR_TYPE
  97 #define WCHAR_TYPE "int"
  98
  99 #undef WCHAR_TYPE_SIZE
 100 #define WCHAR_TYPE_SIZE 32
 101
 102 /* We redefine this to use the ia64 .proc pseudo-op.  */
 103
 104 #undef ASM_DECLARE_FUNCTION_NAME
 105 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 106 do {                                                                    \
 107   fputs ("\t.proc ", FILE);                                             \
 108   assemble_name (FILE, NAME);                                           \
 109   fputc ('\n', FILE);                                                   \
 110   ASM_OUTPUT_LABEL (FILE, NAME);                                        \
 111 } while (0)
 112
 113 /* We redefine this to use the ia64 .endp pseudo-op.  */
 114
 115 #undef ASM_DECLARE_FUNCTION_SIZE
 116 #define ASM_DECLARE_FUNCTION_SIZE(FILE, NAME, DECL) \
 117 do {                                                                    \
 118   fputs ("\t.endp ", FILE);                                             \
 119   assemble_name (FILE, NAME);                                           \
 120   fputc ('\n', FILE);                                                   \
 121 } while (0)
 122
 123 /* A C expression which outputs to the stdio stream STREAM some appropriate
 124    text to go at the start of an assembler file.  */
 125
 126 /* ??? Looks like almost every port, except for a few original ones, get this
 127    wrong.  Must emit #NO_APP as first line of file to turn of special assembler
 128    preprocessing of files.  */
 129
 130 /* ??? Even worse, it doesn't work, because gas does not accept the tab chars
 131    that dwarf2out.c emits when #NO_APP.  */
 132
 133 /* ??? Unrelated, but dwarf2out.c emits unnecessary newlines after strings,
 134    may as well fix at the same time.  */
 135
 136 #undef ASM_FILE_START
 137 #define ASM_FILE_START(STREAM) \
 138 do {                                                                    \
 139   output_file_directive (STREAM, main_input_filename);                  \
 140   emit_safe_across_calls (STREAM);                                      \
 141 } while (0)
 142
 143 /* Similarly for constant pool data.  */
 144
 145 extern unsigned int ia64_section_threshold;
 146 #undef SELECT_RTX_SECTION
 147 #define SELECT_RTX_SECTION(MODE, RTX, ALIGN)                            \
 148 {                                                                       \
 149   if (GET_MODE_SIZE (MODE) > 0                                          \
 150       && GET_MODE_SIZE (MODE) <= ia64_section_threshold)                \
 151     sdata_section ();                                                   \
 152   else if (flag_pic && symbolic_operand ((RTX), (MODE)))                \
 153     data_section ();                                                    \
 154   else                                                                  \
 155     mergeable_constant_section ((MODE), (ALIGN), 0);                    \
 156 }
 157
 158 #undef EXTRA_SECTIONS
 159 #define EXTRA_SECTIONS in_const, in_sdata, in_sbss
 160
 161 #undef EXTRA_SECTION_FUNCTIONS
 162 #define EXTRA_SECTION_FUNCTIONS                                         \
 163   CONST_SECTION_FUNCTION                                                \
 164   SDATA_SECTION_FUNCTION                                                \
 165   SBSS_SECTION_FUNCTION
 166
 167 #define SDATA_SECTION_ASM_OP "\t.sdata"
 168
 169 #define SDATA_SECTION_FUNCTION                                          \
 170 void                                                                    \
 171 sdata_section ()                                                        \
 172 {                                                                       \
 173   if (in_section != in_sdata)                                           \
 174     {                                                                   \
 175       fprintf (asm_out_file, "%s\n", SDATA_SECTION_ASM_OP);             \
 176       in_section = in_sdata;                                            \
 177     }                                                                   \
 178 }
 179
 180 #define SBSS_SECTION_ASM_OP "\t.sbss"
 181
 182 #define SBSS_SECTION_FUNCTION                                           \
 183 void                                                                    \
 184 sbss_section ()                                                         \
 185 {                                                                       \
 186   if (in_section != in_sbss)                                            \
 187     {                                                                   \
 188       fprintf (asm_out_file, "%s\n", SBSS_SECTION_ASM_OP);              \
 189       in_section = in_sbss;                                             \
 190     }                                                                   \
 191 }