gcc/config/arm/aout.h

   1 /* Definitions of target machine for GNU compiler, for ARM with a.out
   2    Copyright (C) 1995-2021 Free Software Foundation, Inc.
   3    Contributed by Richard Earnshaw (rearnsha@armltd.co.uk).
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef ASM_APP_ON
  27 #define ASM_APP_ON              ""
  28 #endif
  29 #ifndef ASM_APP_OFF
  30 #define ASM_APP_OFF             ""
  31 #endif
  32
  33 /* Switch to the text or data segment.  */
  34 #define TEXT_SECTION_ASM_OP     "\t.text"
  35 #define DATA_SECTION_ASM_OP     "\t.data"
  36 #define BSS_SECTION_ASM_OP      "\t.bss"
  37
  38 /* Note: If USER_LABEL_PREFIX or LOCAL_LABEL_PREFIX are changed,
  39    make sure that this change is reflected in the function
  40    coff_arm_is_local_label_name() in bfd/coff-arm.c.  */
  41 #ifndef REGISTER_PREFIX
  42 #define REGISTER_PREFIX         ""
  43 #endif
  44
  45 #ifndef USER_LABEL_PREFIX
  46 #define USER_LABEL_PREFIX       "_"
  47 #endif
  48
  49 #ifndef LOCAL_LABEL_PREFIX
  50 #define LOCAL_LABEL_PREFIX      ""
  51 #endif
  52
  53 /* The assembler's names for the registers.  Note that the ?xx registers are
  54    there so that VFPv3/NEON registers D16-D31 have the same spacing as D0-D15
  55    (each of which is overlaid on two S registers), although there are no
  56    actual single-precision registers which correspond to D16-D31.  New register
  57    p0 is added which is used for MVE predicated cases.  */
  58
  59 #ifndef REGISTER_NAMES
  60 #define REGISTER_NAMES                                          \
  61 {                                                               \
  62   "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",               \
  63   "r8", "r9", "r10", "fp", "ip", "sp", "lr", "pc",              \
  64   "s0",  "s1",  "s2",  "s3",  "s4",  "s5",  "s6",  "s7",        \
  65   "s8",  "s9",  "s10", "s11", "s12", "s13", "s14", "s15",       \
  66   "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",       \
  67   "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",       \
  68   "d16", "?16", "d17", "?17", "d18", "?18", "d19", "?19",       \
  69   "d20", "?20", "d21", "?21", "d22", "?22", "d23", "?23",       \
  70   "d24", "?24", "d25", "?25", "d26", "?26", "d27", "?27",       \
  71   "d28", "?28", "d29", "?29", "d30", "?30", "d31", "?31",       \
  72   "wr0",   "wr1",   "wr2",   "wr3",                             \
  73   "wr4",   "wr5",   "wr6",   "wr7",                             \
  74   "wr8",   "wr9",   "wr10",  "wr11",                            \
  75   "wr12",  "wr13",  "wr14",  "wr15",                            \
  76   "wcgr0", "wcgr1", "wcgr2", "wcgr3",                           \
  77   "cc", "vfpcc", "sfp", "afp", "apsrq", "apsrge", "p0"          \
  78 }
  79 #endif
  80
  81 #ifndef ADDITIONAL_REGISTER_NAMES
  82 #define ADDITIONAL_REGISTER_NAMES               \
  83 {                                               \
  84   {"a1", 0},                                    \
  85   {"a2", 1},                                    \
  86   {"a3", 2},                                    \
  87   {"a4", 3},                                    \
  88   {"v1", 4},                                    \
  89   {"v2", 5},                                    \
  90   {"v3", 6},                                    \
  91   {"v4", 7},                                    \
  92   {"v5", 8},                                    \
  93   {"v6", 9},                                    \
  94   {"rfp", 9}, /* Historical.  */                \
  95   {"sb", 9}, /* Historical.  */                 \
  96   {"v7", 10},                                   \
  97   {"sl", 10},   /* Historical.  */              \
  98   {"r11", 11},  /* fp */                        \
  99   {"r12", 12},  /* ip */                        \
 100   {"r13", 13},  /* sp */                        \
 101   {"r14", 14},  /* lr */                        \
 102   {"r15", 15}   /* pc */                        \
 103 }
 104 #endif
 105
 106 #ifndef OVERLAPPING_REGISTER_NAMES
 107 #define OVERLAPPING_REGISTER_NAMES              \
 108 {                                               \
 109   {"d0",  FIRST_VFP_REGNUM + 0,  2},            \
 110   {"d1",  FIRST_VFP_REGNUM + 2,  2},            \
 111   {"d2",  FIRST_VFP_REGNUM + 4,  2},            \
 112   {"d3",  FIRST_VFP_REGNUM + 6,  2},            \
 113   {"d4",  FIRST_VFP_REGNUM + 8,  2},            \
 114   {"d5",  FIRST_VFP_REGNUM + 10, 2},            \
 115   {"d6",  FIRST_VFP_REGNUM + 12, 2},            \
 116   {"d7",  FIRST_VFP_REGNUM + 14, 2},            \
 117   {"d8",  FIRST_VFP_REGNUM + 16, 2},            \
 118   {"d9",  FIRST_VFP_REGNUM + 18, 2},            \
 119   {"d10", FIRST_VFP_REGNUM + 20, 2},            \
 120   {"d11", FIRST_VFP_REGNUM + 22, 2},            \
 121   {"d12", FIRST_VFP_REGNUM + 24, 2},            \
 122   {"d13", FIRST_VFP_REGNUM + 26, 2},            \
 123   {"d14", FIRST_VFP_REGNUM + 28, 2},            \
 124   {"d15", FIRST_VFP_REGNUM + 30, 2},            \
 125   {"q0",  FIRST_VFP_REGNUM + 0,  4},            \
 126   {"q1",  FIRST_VFP_REGNUM + 4,  4},            \
 127   {"q2",  FIRST_VFP_REGNUM + 8,  4},            \
 128   {"q3",  FIRST_VFP_REGNUM + 12, 4},            \
 129   {"q4",  FIRST_VFP_REGNUM + 16, 4},            \
 130   {"q5",  FIRST_VFP_REGNUM + 20, 4},            \
 131   {"q6",  FIRST_VFP_REGNUM + 24, 4},            \
 132   {"q7",  FIRST_VFP_REGNUM + 28, 4},            \
 133   {"q8",  FIRST_VFP_REGNUM + 32, 4},            \
 134   {"q9",  FIRST_VFP_REGNUM + 36, 4},            \
 135   {"q10", FIRST_VFP_REGNUM + 40, 4},            \
 136   {"q11", FIRST_VFP_REGNUM + 44, 4},            \
 137   {"q12", FIRST_VFP_REGNUM + 48, 4},            \
 138   {"q13", FIRST_VFP_REGNUM + 52, 4},            \
 139   {"q14", FIRST_VFP_REGNUM + 56, 4},            \
 140   {"q15", FIRST_VFP_REGNUM + 60, 4}             \
 141 }
 142 #endif
 143
 144 #ifndef NO_DOLLAR_IN_LABEL
 145 #define NO_DOLLAR_IN_LABEL 1
 146 #endif
 147
 148 /* Generate DBX debugging information.  riscix.h will undefine this because
 149    the native assembler does not support stabs.  */
 150 #define DBX_DEBUGGING_INFO 1
 151
 152 /* Acorn dbx moans about continuation chars, so don't use any.  */
 153 #ifndef DBX_CONTIN_LENGTH
 154 #define DBX_CONTIN_LENGTH  0
 155 #endif
 156
 157 /* Output a function label definition.  */
 158 #ifndef ASM_DECLARE_FUNCTION_NAME
 159 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)   \
 160   do                                                    \
 161     {                                                   \
 162       ARM_DECLARE_FUNCTION_NAME (STREAM, NAME, DECL);   \
 163       ASM_OUTPUT_LABEL (STREAM, NAME);                  \
 164     }                                                   \
 165   while (0)
 166 #endif
 167
 168 /* Globalizing directive for a label.  */
 169 #define GLOBAL_ASM_OP "\t.global\t"
 170
 171 /* Make an internal label into a string.  */
 172 #ifndef ASM_GENERATE_INTERNAL_LABEL
 173 #define ASM_GENERATE_INTERNAL_LABEL(STRING, PREFIX, NUM)  \
 174   sprintf (STRING, "*%s%s%u", LOCAL_LABEL_PREFIX, PREFIX, (unsigned int)(NUM))
 175 #endif
 176
 177 /* Output an element of a dispatch table.  */
 178 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE)                  \
 179   do                                                            \
 180     {                                                           \
 181       gcc_assert (!TARGET_THUMB2);                              \
 182       asm_fprintf (STREAM, "\t.word\t%LL%d\n", VALUE);          \
 183     }                                                           \
 184   while (0)
 185
 186
 187 /* Thumb-2 always uses addr_diff_elf so that the Table Branch instructions
 188    can be used.  For non-pic code where the offsets do not suitable for
 189    TBB/TBH the elements are output as absolute labels.  */
 190 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)              \
 191   do                                                                    \
 192     {                                                                   \
 193       if (TARGET_ARM)                                                   \
 194         asm_fprintf (STREAM, "\tb\t%LL%d\n", VALUE);                    \
 195       else if (TARGET_THUMB1)                                           \
 196         {                                                               \
 197           if (flag_pic || optimize_size)                                \
 198             {                                                           \
 199               switch (GET_MODE(body))                                   \
 200                 {                                                       \
 201                 case E_QImode:                                          \
 202                   asm_fprintf (STREAM, "\t.byte\t(%LL%d-%LL%d)/2\n",    \
 203                                VALUE, REL);                             \
 204                   break;                                                \
 205                 case E_HImode: /* TBH */                                        \
 206                   asm_fprintf (STREAM, "\t.2byte\t(%LL%d-%LL%d)/2\n",   \
 207                                VALUE, REL);                             \
 208                   break;                                                \
 209                 case E_SImode:                                          \
 210                   asm_fprintf (STREAM, "\t.word\t%LL%d-%LL%d\n",        \
 211                                VALUE, REL);                             \
 212                   break;                                                \
 213                 default:                                                \
 214                   gcc_unreachable();                                    \
 215                 }                                                       \
 216             }                                                           \
 217           else                                                          \
 218             asm_fprintf (STREAM, "\t.word\t%LL%d+1\n", VALUE);          \
 219         }                                                               \
 220       else /* Thumb-2 */                                                \
 221         {                                                               \
 222           switch (GET_MODE(body))                                       \
 223             {                                                           \
 224             case E_QImode: /* TBB */                                    \
 225               asm_fprintf (STREAM, "\t.byte\t(%LL%d-%LL%d)/2\n",        \
 226                            VALUE, REL);                                 \
 227               break;                                                    \
 228             case E_HImode: /* TBH */                                    \
 229               asm_fprintf (STREAM, "\t.2byte\t(%LL%d-%LL%d)/2\n",       \
 230                            VALUE, REL);                                 \
 231               break;                                                    \
 232             case E_SImode:                                              \
 233               if (flag_pic)                                             \
 234                 asm_fprintf (STREAM, "\t.word\t%LL%d+1-%LL%d\n", VALUE, REL); \
 235               else                                                      \
 236                 asm_fprintf (STREAM, "\t.word\t%LL%d+1\n", VALUE);      \
 237               break;                                                    \
 238             default:                                                    \
 239               gcc_unreachable();                                        \
 240             }                                                           \
 241         }                                                               \
 242     }                                                                   \
 243   while (0)
 244
 245
 246 #undef  ASM_OUTPUT_ASCII
 247 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN)  \
 248   output_ascii_pseudo_op (STREAM, (const unsigned char *) (PTR), LEN)
 249
 250 /* Output a gap.  In fact we fill it with nulls.  */
 251 #undef  ASM_OUTPUT_SKIP
 252 #define ASM_OUTPUT_SKIP(STREAM, NBYTES)         \
 253   fprintf (STREAM, "\t.space\t%d\n", (int) (NBYTES))
 254
 255 /* Align output to a power of two.  Horrible /bin/as.  */
 256 #ifndef ASM_OUTPUT_ALIGN
 257 #define ASM_OUTPUT_ALIGN(STREAM, POWER)                 \
 258   do                                                    \
 259     {                                                   \
 260       register int amount = 1 << (POWER);               \
 261                                                         \
 262       if (amount == 2)                                  \
 263         fprintf (STREAM, "\t.even\n");                  \
 264       else if (amount != 1)                             \
 265         fprintf (STREAM, "\t.align\t%d\n", amount - 4); \
 266     }                                                   \
 267   while (0)
 268 #endif
 269
 270 /* Output a common block.  */
 271 #ifndef ASM_OUTPUT_COMMON
 272 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)  \
 273   do                                                    \
 274     {                                                   \
 275       fprintf (STREAM, "\t.comm\t");                    \
 276       assemble_name (STREAM, NAME);                     \
 277       asm_fprintf (STREAM, ", %d\t%@ %d\n",             \
 278                    (int)(ROUNDED), (int)(SIZE));        \
 279     }                                                   \
 280   while (0)
 281 #endif
 282
 283 /* Output a local common block.  /bin/as can't do this, so hack a
 284    `.space' into the bss segment.  Note that this is *bad* practice,
 285    which is guaranteed NOT to work since it doesn't define STATIC
 286    COMMON space but merely STATIC BSS space.  */
 287 #ifndef ASM_OUTPUT_ALIGNED_LOCAL
 288 #define ASM_OUTPUT_ALIGNED_LOCAL(STREAM, NAME, SIZE, ALIGN)             \
 289   do                                                                    \
 290     {                                                                   \
 291       switch_to_section (bss_section);                                  \
 292       ASM_OUTPUT_ALIGN (STREAM, floor_log2 (ALIGN / BITS_PER_UNIT));    \
 293       ASM_OUTPUT_LABEL (STREAM, NAME);                                  \
 294       fprintf (STREAM, "\t.space\t%d\n", (int)(SIZE));                  \
 295     }                                                                   \
 296   while (0)
 297 #endif
 298
 299 /* Output a zero-initialized block.  */
 300 #ifndef ASM_OUTPUT_ALIGNED_BSS
 301 #define ASM_OUTPUT_ALIGNED_BSS(STREAM, DECL, NAME, SIZE, ALIGN) \
 302   asm_output_aligned_bss (STREAM, DECL, NAME, SIZE, ALIGN)
 303 #endif
 304
 305 #ifndef ASM_COMMENT_START
 306 #define ASM_COMMENT_START       "@"
 307 #endif
 308
 309 /* This works for GAS and some other assemblers.  */
 310 #define SET_ASM_OP              "\t.set\t"