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 /* Various pseudo-ops for which the Intel assembler uses non-standard
   8    definitions.  */
   9
  10 #undef ASM_BYTE_OP
  11 #define ASM_BYTE_OP "\tdata1\t"
  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 /* ??? Unfortunately, .lcomm doesn't work, because it puts things in either
  26    .bss or .sbss, and we can't control the decision of which is used.  When
  27    I use .lcomm, I get a cryptic "Section group has no member" error from
  28    the Intel simulator.  So we must explicitly put variables in .bss
  29    instead.  This matters only if we care about the Intel assembler.  */
  30
  31 /* This is asm_output_aligned_bss from varasm.c without the ASM_GLOBALIZE_LABEL
  32    call at the beginning.  */
  33
  34 /* This is for final.c, because it is used by ASM_DECLARE_OBJECT_NAME.  */
  35 extern int size_directive_output;
  36
  37 #undef ASM_OUTPUT_ALIGNED_LOCAL
  38 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
  39 do {                                                                    \
  40   if ((DECL)                                                            \
  41       && XSTR (XEXP (DECL_RTL (DECL), 0), 0)[0] == SDATA_NAME_FLAG_CHAR) \
  42     sbss_section ();                                                    \
  43   else                                                                  \
  44     bss_section ();                                                     \
  45   ASM_OUTPUT_ALIGN (FILE, floor_log2 ((ALIGN) / BITS_PER_UNIT));        \
  46   ASM_DECLARE_OBJECT_NAME (FILE, NAME, DECL);                           \
  47   ASM_OUTPUT_SKIP (FILE, SIZE ? SIZE : 1);                              \
  48 } while (0)
  49
  50 /* The # tells the Intel assembler that this is not a register name.
  51    However, we can't emit the # in a label definition, so we set a variable
  52    in ASM_OUTPUT_LABEL to control whether we want the postfix here or not.
  53    We append the # to the label name, but since NAME can be an expression
  54    we have to scan it for a non-label character and insert the # there.  */
  55
  56 #undef ASM_OUTPUT_LABELREF
  57 #define ASM_OUTPUT_LABELREF(STREAM, NAME)       \
  58 do {                                            \
  59   const char *name_ = NAME;                     \
  60   if (*name_ == SDATA_NAME_FLAG_CHAR)           \
  61     name_++;                                    \
  62   if (*name_ == '*')                            \
  63     name_++;                                    \
  64   else                                          \
  65     fputs (user_label_prefix, STREAM);          \
  66   fputs (name_, STREAM);                        \
  67   fputc ('#', STREAM);                          \
  68 } while (0)
  69
  70 /* Intel assembler requires both flags and type if declaring a non-predefined
  71    section.  */
  72 #undef INIT_SECTION_ASM_OP
  73 #define INIT_SECTION_ASM_OP     "\t.section\t.init,\"ax\",\"progbits\""
  74 #undef FINI_SECTION_ASM_OP
  75 #define FINI_SECTION_ASM_OP     "\t.section\t.fini,\"ax\",\"progbits\""
  76
  77 /* svr4.h undefines this, so we need to define it here.  */
  78 #define DBX_REGISTER_NUMBER(REGNO) \
  79   ia64_dbx_register_number(REGNO)
  80
  81 /* Things that svr4.h defines to the wrong type, because it assumes 32 bit
  82    ints and 32 bit longs.  */
  83
  84 #undef SIZE_TYPE
  85 #define SIZE_TYPE "long unsigned int"
  86
  87 #undef PTRDIFF_TYPE
  88 #define PTRDIFF_TYPE "long int"
  89
  90 #undef WCHAR_TYPE
  91 #define WCHAR_TYPE "int"
  92
  93 #undef WCHAR_TYPE_SIZE
  94 #define WCHAR_TYPE_SIZE 32
  95
  96 /* We redefine this to use the ia64 .proc pseudo-op.  */
  97
  98 #undef ASM_DECLARE_FUNCTION_NAME
  99 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
 100 do {                                                                    \
 101   fputs ("\t.proc ", FILE);                                             \
 102   assemble_name (FILE, NAME);                                           \
 103   fputc ('\n', FILE);                                                   \
 104   ASM_OUTPUT_LABEL (FILE, NAME);                                        \
 105 } while (0)
 106
 107 /* We redefine this to use the ia64 .endp pseudo-op.  */
 108
 109 #undef ASM_DECLARE_FUNCTION_SIZE
 110 #define ASM_DECLARE_FUNCTION_SIZE(FILE, NAME, DECL) \
 111 do {                                                                    \
 112   fputs ("\t.endp ", FILE);                                             \
 113   assemble_name (FILE, NAME);                                           \
 114   fputc ('\n', FILE);                                                   \
 115 } while (0)
 116
 117 /* A C expression which outputs to the stdio stream STREAM some appropriate
 118    text to go at the start of an assembler file.  */
 119
 120 /* ??? Looks like almost every port, except for a few original ones, get this
 121    wrong.  Must emit #NO_APP as first line of file to turn of special assembler
 122    preprocessing of files.  */
 123
 124 /* ??? Even worse, it doesn't work, because gas does not accept the tab chars
 125    that dwarf2out.c emits when #NO_APP.  */
 126
 127 /* ??? Unrelated, but dwarf2out.c emits unnecessary newlines after strings,
 128    may as well fix at the same time.  */
 129
 130 #undef ASM_FILE_START
 131 #define ASM_FILE_START(STREAM) \
 132 do {                                                                    \
 133   output_file_directive (STREAM, main_input_filename);                  \
 134   emit_safe_across_calls (STREAM);                                      \
 135 } while (0)
 136
 137 /* Case label alignment is handled by ADDR_VEC_ALIGN now.  */
 138
 139 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
 140 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE)
 141
 142 /* We override svr4.h so that we can support the sdata section.  */
 143
 144 #undef SELECT_SECTION
 145 #define SELECT_SECTION(DECL,RELOC)                                      \
 146 {                                                                       \
 147   if (TREE_CODE (DECL) == STRING_CST)                                   \
 148     {                                                                   \
 149       if (! flag_writable_strings)                                      \
 150         const_section ();                                               \
 151       else                                                              \
 152         data_section ();                                                \
 153     }                                                                   \
 154   else if (TREE_CODE (DECL) == VAR_DECL)                                \
 155     {                                                                   \
 156       if (XSTR (XEXP (DECL_RTL (DECL), 0), 0)[0]                        \
 157           == SDATA_NAME_FLAG_CHAR)                                      \
 158         sdata_section ();                                               \
 159       /* ??? We need the extra ! RELOC check, because the default is to \
 160          only check RELOC if flag_pic is set, and we don't set flag_pic \
 161          (yet?).  */                                                    \
 162       else if (DECL_READONLY_SECTION (DECL, RELOC) && ! (RELOC))        \
 163         const_section ();                                               \
 164       else                                                              \
 165         data_section ();                                                \
 166     }                                                                   \
 167   /* This could be a CONSTRUCTOR containing ADDR_EXPR of a VAR_DECL,    \
 168      in which case we can't put it in a shared library rodata.  */      \
 169   else if (flag_pic && (RELOC))                                         \
 170     data_section ();                                                    \
 171   else                                                                  \
 172     const_section ();                                                   \
 173 }
 174
 175 /* Similarly for constant pool data.  */
 176
 177 extern unsigned int ia64_section_threshold;
 178 #undef SELECT_RTX_SECTION
 179 #define SELECT_RTX_SECTION(MODE, RTX)                                   \
 180 {                                                                       \
 181   if (GET_MODE_SIZE (MODE) > 0                                          \
 182       && GET_MODE_SIZE (MODE) <= ia64_section_threshold)                \
 183     sdata_section ();                                                   \
 184   else if (flag_pic && symbolic_operand ((RTX), (MODE)))                \
 185     data_section ();                                                    \
 186   else                                                                  \
 187     const_section ();                                                   \
 188 }
 189
 190 #undef EXTRA_SECTIONS
 191 #define EXTRA_SECTIONS in_const, in_sdata, in_sbss
 192
 193 #undef EXTRA_SECTION_FUNCTIONS
 194 #define EXTRA_SECTION_FUNCTIONS                                         \
 195   CONST_SECTION_FUNCTION                                                \
 196   SDATA_SECTION_FUNCTION                                                \
 197   SBSS_SECTION_FUNCTION
 198
 199 #define SDATA_SECTION_ASM_OP "\t.sdata"
 200
 201 #define SDATA_SECTION_FUNCTION                                          \
 202 void                                                                    \
 203 sdata_section ()                                                        \
 204 {                                                                       \
 205   if (in_section != in_sdata)                                           \
 206     {                                                                   \
 207       fprintf (asm_out_file, "%s\n", SDATA_SECTION_ASM_OP);             \
 208       in_section = in_sdata;                                            \
 209     }                                                                   \
 210 }
 211
 212 #define SBSS_SECTION_ASM_OP "\t.sbss"
 213
 214 #define SBSS_SECTION_FUNCTION                                           \
 215 void                                                                    \
 216 sbss_section ()                                                         \
 217 {                                                                       \
 218   if (in_section != in_sbss)                                            \
 219     {                                                                   \
 220       fprintf (asm_out_file, "%s\n", SBSS_SECTION_ASM_OP);              \
 221       in_section = in_sbss;                                             \
 222     }                                                                   \
 223 }