gas/config/tc-hppa.h

   1 /* tc-hppa.h -- Header file for the PA
   2    Copyright (C) 1989-2022 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS 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 3, or (at your option)
   9    any later version.
  10
  11    GAS 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 GAS; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 /* HP PA-RISC support was contributed by the Center for Software Science
  22    at the University of Utah.  */
  23
  24 /* Please refrain from exposing the world to the internals of tc-hppa.c
  25    when this file is included.  This means only declaring exported functions,
  26    (please PARAMize them!) not exporting structures and data items which
  27    are used solely within tc-hppa.c, etc.
  28
  29    Also refrain from adding any more object file dependent code, there is
  30    already far too much object file format dependent code in this file.
  31    In theory this file should contain only exported functions, structures
  32    and data declarations common to all PA assemblers.  */
  33
  34 #ifndef _TC_HPPA_H
  35 #define _TC_HPPA_H
  36
  37 #ifndef TC_HPPA
  38 #define TC_HPPA 1
  39 #endif
  40
  41 #define TARGET_BYTES_BIG_ENDIAN 1
  42
  43 #define TARGET_ARCH bfd_arch_hppa
  44
  45 #define WORKING_DOT_WORD
  46
  47 #ifdef OBJ_ELF
  48 #if TARGET_ARCH_SIZE == 64
  49 #include "bfd/elf64-hppa.h"
  50 #if defined (TE_LINUX) || defined (TE_NetBSD)
  51 #define TARGET_FORMAT "elf64-hppa-linux"
  52 #else
  53 #define TARGET_FORMAT "elf64-hppa"
  54 #endif
  55 #else /* TARGET_ARCH_SIZE == 32 */
  56 #include "bfd/elf32-hppa.h"
  57 #if defined (TE_LINUX)
  58 #define TARGET_FORMAT "elf32-hppa-linux"
  59 #else
  60 #if defined (TE_NetBSD)
  61 #define TARGET_FORMAT "elf32-hppa-netbsd"
  62 #else
  63 #define TARGET_FORMAT "elf32-hppa"
  64 #endif
  65 #endif
  66 #endif
  67 #endif
  68
  69 #ifdef OBJ_SOM
  70 #include "bfd/som.h"
  71 #define TARGET_FORMAT "som"
  72 #endif
  73
  74 #if defined(TE_LINUX) || defined(TE_NetBSD)
  75 /* Define to compile in an extra assembler option, -c, which enables a
  76    warning (once per file) when a comment is encountered.
  77    The hppa comment char is a `;' which tends to occur in random C asm
  78    statements.  A semicolon is a line separator for most assemblers.
  79    It's hard to find these lurking semicolons.  Thus...  */
  80 #define WARN_COMMENTS 1
  81 #endif
  82
  83 #define ASEC_NULL (asection *)0
  84
  85 /* pa_define_label gets used outside of tc-hppa.c via tc_frob_label.  */
  86 extern void pa_define_label (symbolS *);
  87 extern int parse_cons_expression_hppa (expressionS *);
  88 extern void cons_fix_new_hppa (fragS *, int, int, expressionS *, int);
  89 extern int hppa_force_relocation (struct fix *);
  90
  91 /* This gets called before writing the object file to make sure
  92    things like entry/exit and proc/procend pairs match.  */
  93 extern void pa_check_eof (void);
  94 #define tc_frob_file pa_check_eof
  95
  96 #define tc_frob_label(sym) pa_define_label (sym)
  97
  98 extern const char       hppa_symbol_chars[];
  99 #define tc_symbol_chars hppa_symbol_chars
 100
 101 #define RELOC_EXPANSION_POSSIBLE
 102 #define MAX_RELOC_EXPANSION 6
 103
 104 /* The PA needs to parse field selectors in .byte, etc.  */
 105
 106 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
 107   parse_cons_expression_hppa (EXP)
 108 #define TC_CONS_FIX_NEW cons_fix_new_hppa
 109 #define TC_PARSE_CONS_RETURN_TYPE int
 110 #define TC_PARSE_CONS_RETURN_NONE e_fsel
 111
 112 /* On the PA, an exclamation point can appear in an instruction.  It is
 113    used in FP comparison instructions and as an end of line marker.
 114    When used in an instruction it will always follow a comma.  */
 115 #define TC_EOL_IN_INSN(PTR)     (*(PTR) == '!' && (PTR)[-1] == ',')
 116
 117 int hppa_fix_adjustable (struct fix *);
 118 #define tc_fix_adjustable hppa_fix_adjustable
 119
 120 #define EXTERN_FORCE_RELOC 1
 121
 122 /* Because of the strange PA calling conventions, it is sometimes
 123    necessary to emit a relocation for a call even though it would
 124    normally appear safe to handle it completely within GAS.  */
 125 #define TC_FORCE_RELOCATION(FIX) hppa_force_relocation (FIX)
 126
 127 /* Values passed to md_apply_fix don't include the symbol value.  */
 128 #define MD_APPLY_SYM_VALUE(FIX) 0
 129
 130 /* The PA needs this for PIC code generation.  */
 131 #define TC_VALIDATE_FIX_SUB(FIX, SEG)                   \
 132   (md_register_arithmetic || (SEG) != reg_section)
 133
 134 #ifdef OBJ_SOM
 135 /* If a symbol is imported, but never used, then the symbol should
 136    *not* end up in the symbol table.  Likewise for absolute symbols
 137    with local scope.  */
 138 #define tc_frob_symbol(sym,punt) \
 139     if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr && ! symbol_used_p (sym)) \
 140         || (S_GET_SEGMENT (sym) == bfd_abs_section_ptr \
 141             && ! S_IS_EXTERNAL (sym))) \
 142       punt = 1
 143
 144 /* We need to be able to make relocations involving the difference of
 145    two symbols.  This includes the difference of two symbols when
 146    one of them is undefined (this comes up in PIC code generation).
 147
 148    We allow the difference of two symbols when the subtract symbol is
 149    local to the relocation.  This is implemented using R_HPPA_COMPLEX.
 150
 151    This has some limitations.  Difference expressions only work between
 152    symbols in the same segment/quadrant of a module since the HP dynamic
 153    loader relocates the text and data segments independently.  Thus, a
 154    difference expression can't be used between text and data symbols,
 155    or between symbols in different executable modules.  */
 156 #define DIFF_EXPR_OK 1
 157 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
 158 #define UNDEFINED_DIFFERENCE_OK
 159 #endif
 160
 161 #ifdef OBJ_ELF
 162
 163 /* Difference expressions for the 64-bit HP-UX target have the same
 164    limitations as those for the 32-bit SOM target.  */
 165 #define DIFF_EXPR_OK 1
 166
 167 /* Handle .type pseudo.  Given a type string of `millicode', set the
 168    internal elf symbol type to STT_PARISC_MILLI, and return
 169    BSF_FUNCTION for the BFD symbol type.  */
 170 #define md_elf_symbol_type(name, sym, elf)                              \
 171   ((strcmp ((name), "millicode") == 0                                   \
 172     || strcmp ((name), "STT_PARISC_MILLI") == 0)                        \
 173    ? (((elf)->internal_elf_sym.st_info = ELF_ST_INFO                    \
 174        (ELF_ST_BIND ((elf)->internal_elf_sym.st_info), STT_PARISC_MILLI)\
 175        ), BSF_FUNCTION)                                                 \
 176    : -1)
 177
 178 /* Handle type change from .type pseudo: Zap STT_PARISC_MILLI when
 179    switching to a non-function type.  */
 180 #define md_elf_symbol_type_change(sym, elf, type)                       \
 181   ((type) != BSF_FUNCTION                                               \
 182    && (((elf)->internal_elf_sym.st_info =                               \
 183         ELF_ST_INFO (ELF_ST_BIND ((elf)->internal_elf_sym.st_info),     \
 184                      STT_NOTYPE)), 0))
 185
 186 #define tc_frob_symbol(sym,punt) \
 187   { \
 188     if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr \
 189          && ! symbol_used_p (sym) \
 190          && ELF_ST_VISIBILITY (S_GET_OTHER (sym)) == STV_DEFAULT) \
 191         || strcmp (S_GET_NAME (sym), "$global$") == 0 \
 192         || strcmp (S_GET_NAME (sym), "$segrel$") == 0 \
 193         || strcmp (S_GET_NAME (sym), "$PIC_pcrel$0") == 0 \
 194         || strcmp (S_GET_NAME (sym), "$tls_gdidx$") == 0 \
 195         || strcmp (S_GET_NAME (sym), "$tls_ldidx$") == 0 \
 196         || strcmp (S_GET_NAME (sym), "$tls_dtpoff$") == 0 \
 197         || strcmp (S_GET_NAME (sym), "$tls_ieoff$") == 0 \
 198         || strcmp (S_GET_NAME (sym), "$tls_leoff$") == 0) \
 199       punt = 1; \
 200   }
 201
 202 #define elf_tc_final_processing elf_hppa_final_processing
 203 void elf_hppa_final_processing (void);
 204 #endif /* OBJ_ELF */
 205
 206 #define md_operand(x)
 207
 208 /* Allow register expressions to be treated as absolute expressions.
 209    A silly fudge required for backwards compatibility.  */
 210 #define md_optimize_expr hppa_force_reg_syms_absolute
 211
 212 int hppa_force_reg_syms_absolute (expressionS *, operatorT, expressionS *);
 213
 214 #define TC_FIX_TYPE void *
 215 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = NULL)
 216
 217 #ifdef OBJ_ELF
 218 #define TARGET_USE_CFIPOP 1
 219
 220 #define tc_cfi_frame_initial_instructions hppa_cfi_frame_initial_instructions
 221 extern void hppa_cfi_frame_initial_instructions (void);
 222
 223 #define tc_regname_to_dw2regnum hppa_regname_to_dw2regnum
 224 extern int hppa_regname_to_dw2regnum (char *regname);
 225
 226 #define DWARF2_LINE_MIN_INSN_LENGTH 4
 227 #define DWARF2_DEFAULT_RETURN_COLUMN 2
 228 #if TARGET_ARCH_SIZE == 64
 229 #define DWARF2_CIE_DATA_ALIGNMENT 8
 230 #define DWARF2_FDE_RELOC_SIZE 8
 231 #else
 232 #define DWARF2_CIE_DATA_ALIGNMENT 4
 233 #endif
 234
 235 #if !defined (TE_LINUX) && !defined (TE_NetBSD)
 236 /* Due to the way dynamic linking to personality functions is handled
 237    on HP-UX, we need to have a read-write .eh_frame section.  */
 238 #define DWARF2_EH_FRAME_READ_ONLY 0
 239
 240 /* Because differences between text and data symbols don't work, we
 241    can't use difference expressions during CFI generation.  */
 242 #define CFI_DIFF_EXPR_OK 0
 243 #endif
 244
 245 #endif /* OBJ_ELF */
 246 #endif /* _TC_HPPA_H */