binutils-gdb/gas/config/tc-hppa.h

/* tc-hppa.h -- Header file for the PA
   Copyright (C) 1989-2020 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GAS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GAS; see the file COPYING.  If not, write to the Free
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

/* HP PA-RISC support was contributed by the Center for Software Science
   at the University of Utah.  */

/* Please refrain from exposing the world to the internals of tc-hppa.c
   when this file is included.  This means only declaring exported functions,
   (please PARAMize them!) not exporting structures and data items which
   are used solely within tc-hppa.c, etc.

   Also refrain from adding any more object file dependent code, there is
   already far too much object file format dependent code in this file.
   In theory this file should contain only exported functions, structures
   and data declarations common to all PA assemblers.  */

#ifndef _TC_HPPA_H
#define _TC_HPPA_H

#ifndef TC_HPPA
#define TC_HPPA	1
#endif

#define TARGET_BYTES_BIG_ENDIAN 1

#define TARGET_ARCH bfd_arch_hppa

#define WORKING_DOT_WORD

#ifdef OBJ_ELF
#if TARGET_ARCH_SIZE == 64
#include "bfd/elf64-hppa.h"
#if defined (TE_LINUX) || defined (TE_NetBSD)
#define TARGET_FORMAT "elf64-hppa-linux"
#else
#define TARGET_FORMAT "elf64-hppa"
#endif
#else /* TARGET_ARCH_SIZE == 32 */
#include "bfd/elf32-hppa.h"
#if defined (TE_LINUX)
#define TARGET_FORMAT "elf32-hppa-linux"
#else
#if defined (TE_NetBSD)
#define TARGET_FORMAT "elf32-hppa-netbsd"
#else
#define TARGET_FORMAT "elf32-hppa"
#endif
#endif
#endif
#endif

#ifdef OBJ_SOM
#include "bfd/som.h"
#define TARGET_FORMAT "som"
#endif

#if defined(TE_LINUX) || defined(TE_NetBSD)
/* Define to compile in an extra assembler option, -c, which enables a
   warning (once per file) when a comment is encountered.
   The hppa comment char is a `;' which tends to occur in random C asm
   statements.  A semicolon is a line separator for most assemblers.
   It's hard to find these lurking semicolons.  Thus...  */
#define WARN_COMMENTS 1
#endif

/* FIXME.  Why oh why aren't these defined somewhere globally?  */
#ifndef FALSE
#define FALSE   (0)
#define TRUE    (!FALSE)
#endif

#define ASEC_NULL (asection *)0

/* pa_define_label gets used outside of tc-hppa.c via tc_frob_label.  */
extern void pa_define_label (symbolS *);
extern int parse_cons_expression_hppa (expressionS *);
extern void cons_fix_new_hppa (fragS *, int, int, expressionS *, int);
extern int hppa_force_relocation (struct fix *);

/* This gets called before writing the object file to make sure
   things like entry/exit and proc/procend pairs match.  */
extern void pa_check_eof (void);
#define tc_frob_file pa_check_eof

#define tc_frob_label(sym) pa_define_label (sym)

extern const char	hppa_symbol_chars[];
#define tc_symbol_chars	hppa_symbol_chars

#define RELOC_EXPANSION_POSSIBLE
#define MAX_RELOC_EXPANSION 6

/* The PA needs to parse field selectors in .byte, etc.  */

#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
  parse_cons_expression_hppa (EXP)
#define TC_CONS_FIX_NEW cons_fix_new_hppa
#define TC_PARSE_CONS_RETURN_TYPE int
#define TC_PARSE_CONS_RETURN_NONE e_fsel

/* On the PA, an exclamation point can appear in an instruction.  It is
   used in FP comparison instructions and as an end of line marker.
   When used in an instruction it will always follow a comma.  */
#define TC_EOL_IN_INSN(PTR)	(*(PTR) == '!' && (PTR)[-1] == ',')

int hppa_fix_adjustable (struct fix *);
#define tc_fix_adjustable hppa_fix_adjustable

#define EXTERN_FORCE_RELOC 1

/* Because of the strange PA calling conventions, it is sometimes
   necessary to emit a relocation for a call even though it would
   normally appear safe to handle it completely within GAS.  */
#define TC_FORCE_RELOCATION(FIX) hppa_force_relocation (FIX)

/* Values passed to md_apply_fix don't include the symbol value.  */
#define MD_APPLY_SYM_VALUE(FIX) 0

#ifdef OBJ_SOM
/* If a symbol is imported, but never used, then the symbol should
   *not* end up in the symbol table.  Likewise for absolute symbols
   with local scope.  */
#define tc_frob_symbol(sym,punt) \
    if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr && ! symbol_used_p (sym)) \
	|| (S_GET_SEGMENT (sym) == bfd_abs_section_ptr \
	    && ! S_IS_EXTERNAL (sym))) \
      punt = 1

/* We need to be able to make relocations involving the difference of
   two symbols.  This includes the difference of two symbols when
   one of them is undefined (this comes up in PIC code generation).

   We allow the difference of two symbols when the subtract symbol is
   local to the relocation.  This is implemented using R_HPPA_COMPLEX.

   This has some limitations.  Difference expressions only work between
   symbols in the same segment/quadrant of a module since the HP dynamic
   loader relocates the text and data segments independently.  Thus, a
   difference expression can't be used between text and data symbols,
   or between symbols in different executable modules.  */
#define DIFF_EXPR_OK 1
#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
#define UNDEFINED_DIFFERENCE_OK
#endif

#ifdef OBJ_ELF

/* Difference expressions for the 64-bit HP-UX target have the same
   limitations as those for the 32-bit SOM target.  */
#define DIFF_EXPR_OK 1

/* Handle .type pseudo.  Given a type string of `millicode', set the
   internal elf symbol type to STT_PARISC_MILLI, and return
   BSF_FUNCTION for the BFD symbol type.  */
#define md_elf_symbol_type(name, sym, elf)				\
  ((strcmp ((name), "millicode") == 0					\
    || strcmp ((name), "STT_PARISC_MILLI") == 0)			\
   ? (((elf)->internal_elf_sym.st_info = ELF_ST_INFO			\
       (ELF_ST_BIND ((elf)->internal_elf_sym.st_info), STT_PARISC_MILLI)\
       ), BSF_FUNCTION)							\
   : -1)

/* Handle type change from .type pseudo: Zap STT_PARISC_MILLI when
   switching to a non-function type.  */
#define md_elf_symbol_type_change(sym, elf, type)			\
  ((type) != BSF_FUNCTION						\
   && (((elf)->internal_elf_sym.st_info = 				\
	ELF_ST_INFO (ELF_ST_BIND ((elf)->internal_elf_sym.st_info),	\
		     STT_NOTYPE)), 0))

#define tc_frob_symbol(sym,punt) \
  { \
    if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr \
         && ! symbol_used_p (sym) \
         && ELF_ST_VISIBILITY (S_GET_OTHER (sym)) == STV_DEFAULT) \
	|| strcmp (S_GET_NAME (sym), "$global$") == 0 \
	|| strcmp (S_GET_NAME (sym), "$segrel$") == 0 \
	|| strcmp (S_GET_NAME (sym), "$PIC_pcrel$0") == 0 \
	|| strcmp (S_GET_NAME (sym), "$tls_gdidx$") == 0 \
	|| strcmp (S_GET_NAME (sym), "$tls_ldidx$") == 0 \
	|| strcmp (S_GET_NAME (sym), "$tls_dtpoff$") == 0 \
	|| strcmp (S_GET_NAME (sym), "$tls_ieoff$") == 0 \
	|| strcmp (S_GET_NAME (sym), "$tls_leoff$") == 0) \
      punt = 1; \
  }

#define elf_tc_final_processing	elf_hppa_final_processing
void elf_hppa_final_processing (void);
#endif /* OBJ_ELF */

#define md_operand(x)

/* Allow register expressions to be treated as absolute expressions.
   A silly fudge required for backwards compatibility.  */
#define md_optimize_expr hppa_force_reg_syms_absolute

int hppa_force_reg_syms_absolute (expressionS *, operatorT, expressionS *);

#define TC_FIX_TYPE void *
#define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = NULL)

#ifdef OBJ_ELF
#define TARGET_USE_CFIPOP 1

#define tc_cfi_frame_initial_instructions hppa_cfi_frame_initial_instructions
extern void hppa_cfi_frame_initial_instructions (void);

#define tc_regname_to_dw2regnum hppa_regname_to_dw2regnum
extern int hppa_regname_to_dw2regnum (char *regname);

#define DWARF2_LINE_MIN_INSN_LENGTH 4
#define DWARF2_DEFAULT_RETURN_COLUMN 2
#if TARGET_ARCH_SIZE == 64
#define DWARF2_CIE_DATA_ALIGNMENT 8
#define DWARF2_FDE_RELOC_SIZE 8
#else
#define DWARF2_CIE_DATA_ALIGNMENT 4
#endif

#if !defined (TE_LINUX) && !defined (TE_NetBSD)
/* Due to the way dynamic linking to personality functions is handled
   on HP-UX, we need to have a read-write .eh_frame section.  */
#define DWARF2_EH_FRAME_READ_ONLY 0

/* Because differences between text and data symbols don't work, we
   can't use difference expressions during CFI generation.  */
#define CFI_DIFF_EXPR_OK 0
#endif

#endif /* OBJ_ELF */
#endif /* _TC_HPPA_H */