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binutils-gdb/gas/config/tc-nds32.h
Kuan-Lin Chen ea16498d5a NDS32: Set branch instruction to relaxable. 
Relaxable fragments can be relaxed when there are alignment requirements.
Besides, insert a dummy fragment in the final to make sure that all
alignment is traversed.  Finally, convert these fragments
in md_convert_frag with relax_table.
2015-01-29 16:29:42 +08:00

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/* tc-nds32.h -- Header file for tc-nds32.c.
Copyright (C) 2012-2015 Free Software Foundation, Inc.
Contributed by Andes Technology Corporation.
This file is part of GAS.
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. */
#ifndef TC_NDS32
#define TC_NDS32
#include "bfd_stdint.h"
#define LISTING_HEADER \
(target_big_endian ? "NDS32 GAS" : "NDS32 GAS Little Endian")
/* The target BFD architecture. */
#define TARGET_ARCH bfd_arch_nds32
/* mapping to mach_table[5] */
#define ISA_V1 bfd_mach_n1h
#define ISA_V2 bfd_mach_n1h_v2
#define ISA_V3 bfd_mach_n1h_v3
#define ISA_V3M bfd_mach_n1h_v3m
/* Default to big endian. Please note that for Andes architecture,
instructions are always in big-endian format. */
#ifndef TARGET_BYTES_BIG_ENDIAN
#define TARGET_BYTES_BIG_ENDIAN 1
#endif
/* as.c. */
/* Extend GAS command line option handling capability. */
extern int nds32_parse_option (int, char *);
extern void nds32_after_parse_args (void);
/* The endianness of the target format may change based on command
line arguments. */
extern const char * nds32_target_format (void);
#define md_parse_option(optc, optarg) nds32_parse_option (optc, optarg)
#define md_after_parse_args() nds32_after_parse_args ()
#define TARGET_FORMAT nds32_target_format()
/* expr.c */
extern int nds32_parse_name (char const *, expressionS *, enum expr_mode, char *);
extern bfd_boolean nds32_allow_local_subtract (expressionS *, expressionS *, segT);
#define md_parse_name(name, exprP, mode, nextcharP) \
nds32_parse_name (name, exprP, mode, nextcharP)
#define md_allow_local_subtract(lhs,rhs,sect) nds32_allow_local_subtract (lhs, rhs, sect)
/* dwarf2dbg.c. */
#define DWARF2_USE_FIXED_ADVANCE_PC 1
/* write.c. */
extern long nds32_pcrel_from_section (struct fix *, segT);
extern bfd_boolean nds32_fix_adjustable (struct fix *);
extern void nds32_frob_file (void);
extern void nds32_post_relax_hook (void);
extern void nds32_frob_file_before_fix (void);
extern void elf_nds32_final_processing (void);
extern int nds32_validate_fix_sub (struct fix *, segT);
extern int nds32_force_relocation (struct fix *);
extern void nds32_set_section_relocs (asection *, arelent ** , unsigned int);
/* Fill in rs_align_code fragments. TODO: Review this. */
extern void nds32_handle_align (fragS *);
extern int nds32_relax_frag (segT, fragS *, long);
extern int tc_nds32_regname_to_dw2regnum (char *);
extern void tc_nds32_frame_initial_instructions (void);
#define MD_PCREL_FROM_SECTION(fix, sect) nds32_pcrel_from_section (fix, sect)
#define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 0
#define tc_fix_adjustable(FIX) nds32_fix_adjustable (FIX)
#define md_apply_fix(fixP, addn, seg) nds32_apply_fix (fixP, addn, seg)
#define md_post_relax_hook nds32_post_relax_hook ()
#define tc_frob_file_before_fix() nds32_frob_file_before_fix ()
#define elf_tc_final_processing() elf_nds32_final_processing ()
/* For DIFF relocations. The default behavior is inconsistent with the
asm internal document. */
#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC) \
(! SEG_NORMAL (SEC) || TC_FORCE_RELOCATION (FIX))
#define TC_FORCE_RELOCATION(fix) nds32_force_relocation (fix)
#define TC_VALIDATE_FIX_SUB(FIX,SEG) nds32_validate_fix_sub (FIX,SEG)
#define SET_SECTION_RELOCS(sec, relocs, n) nds32_set_section_relocs (sec, relocs, n)
/* Values passed to md_apply_fix don't include the symbol value. */
#define MD_APPLY_SYM_VALUE(FIX) 0
#define HANDLE_ALIGN(f) nds32_handle_align (f)
#undef DIFF_EXPR_OK /* They should be fixed in linker. */
#define md_relax_frag(segment, fragP, stretch) nds32_relax_frag (segment, fragP, stretch)
#define WORKING_DOT_WORD /* We don't need to handle .word strangely. */
/* Using to chain fixup with previous fixup. */
#define TC_FIX_TYPE struct fix *
#define TC_INIT_FIX_DATA(fixP) \
do \
{ \
fixP->tc_fix_data = NULL; \
} \
while (0)
/* read.c. */
/* Extend GAS macro handling capability. */
extern void nds32_macro_start (void);
extern void nds32_macro_end (void);
extern void nds32_macro_info (void *);
extern void nds32_start_line_hook (void);
extern void nds32_elf_section_change_hook (void);
extern void md_begin (void);
extern void md_end (void);
extern int nds32_start_label (int, int);
extern void nds32_cleanup (void);
extern void nds32_flush_pending_output (void);
extern void nds32_cons_align (int);
extern void nds32_check_label (symbolS *);
extern void nds32_frob_label (symbolS *);
extern void nds32_pre_do_align (int, char *, int, int);
extern void nds32_do_align (int);
#define md_macro_start() nds32_macro_start ()
#define md_macro_end() nds32_macro_end ()
#define md_macro_info(args) nds32_macro_info (args)
#define TC_START_LABEL(C, S, STR) (C == ':' && nds32_start_label (0, 0))
#define tc_check_label(label) nds32_check_label (label)
#define tc_frob_label(label) nds32_frob_label (label)
#define md_end md_end
#define md_start_line_hook() nds32_start_line_hook ()
#define md_cons_align(n) nds32_cons_align (n)
/* COLE: TODO: Review md_do_align. */
#define md_do_align(N, FILL, LEN, MAX, LABEL) \
nds32_pre_do_align (N, FILL, LEN, MAX); \
if ((N) > 1 && (subseg_text_p (now_seg) \
|| strncmp (now_seg->name, ".gcc_except_table", sizeof(".gcc_except_table") - 1) == 0)) \
nds32_do_align (N); \
goto LABEL;
#define md_elf_section_change_hook() nds32_elf_section_change_hook ()
#define md_flush_pending_output() nds32_flush_pending_output ()
#define md_cleanup() nds32_cleanup ()
#define LOCAL_LABELS_FB 1 /* Permit temporary numeric labels. */
/* frags.c. */
enum FRAG_ATTR
{
NDS32_FRAG_RELAXABLE = 0x1,
NDS32_FRAG_RELAXED = 0x2,
NDS32_FRAG_BRANCH = 0x4,
NDS32_FRAG_LABEL = 0x8,
NDS32_FRAG_FINAL = 0x10,
NDS32_FRAG_RELAXABLE_BRANCH = 0x20,
NDS32_FRAG_ALIGN = 0x40
};
struct nds32_frag_type
{
relax_substateT flag;
struct nds32_opcode *opcode;
uint32_t insn;
/* To Save previos label fixup if existence. */
struct fix *fixup;
};
extern void nds32_frag_init (fragS *);
#define TC_FRAG_TYPE struct nds32_frag_type
#define TC_FRAG_INIT(fragP) nds32_frag_init (fragP)
/* CFI directive. */
extern void nds32_elf_frame_initial_instructions (void);
extern int tc_nds32_regname_to_dw2regnum (char *);
#define TARGET_USE_CFIPOP 1
#define DWARF2_DEFAULT_RETURN_COLUMN 30
#define DWARF2_CIE_DATA_ALIGNMENT -4
#define DWARF2_LINE_MIN_INSN_LENGTH 2
#define tc_regname_to_dw2regnum tc_nds32_regname_to_dw2regnum
#define tc_cfi_frame_initial_instructions tc_nds32_frame_initial_instructions
/* COLE: TODO: Review These. They seem to be obsoleted. */
#if 1
#define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \
((FIX)->fx_addsy == NULL \
|| (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
&& ! S_IS_WEAK ((FIX)->fx_addsy) \
&& S_IS_DEFINED ((FIX)->fx_addsy) \
&& ! S_IS_COMMON ((FIX)->fx_addsy)))
#define TC_HANDLES_FX_DONE
/* This arranges for gas/write.c to not apply a relocation if
obj_fix_adjustable() says it is not adjustable. */
#define TC_FIX_ADJUSTABLE(fixP) obj_fix_adjustable (fixP)
#endif
/* Because linker may relax the code, assemble-time expression
optimization is not allowed. */
#define md_allow_eh_opt 0
/* For nds32 relax. */
enum nds32_br_range
{
BR_RANGE_S256 = 0,
BR_RANGE_S16K,
BR_RANGE_S64K,
BR_RANGE_S16M,
BR_RANGE_U4G,
BR_RANGE_NUM
};
enum nds32_ramp
{
NDS32_CREATE_LABEL = 1,
NDS32_RELAX = (1 << 1), /* Obsolete in the future. */
NDS32_ORIGIN = (1 << 2),
NDS32_INSN16 = (1 << 3),
NDS32_PTR = (1 << 4),
NDS32_ABS = (1 << 5),
NDS32_HINT = (1 << 6),
NDS32_FIX = (1 << 7),
NDS32_ADDEND = (1 << 8),
NDS32_SYM = (1 << 9),
NDS32_PCREL = (1 << 10)
};
typedef struct nds32_relax_fixup_info
{
int offset;
int size;
/* Reverse branch has to jump to the end of instruction pattern. */
int ramp;
enum bfd_reloc_code_real r_type;
} nds32_relax_fixup_info_t;
typedef struct nds32_cond_field
{
int offset;
int bitpos; /* Register position. */
int bitmask; /* Number of register bits. */
bfd_boolean signed_extend;
} nds32_cond_field_t;
/* The max relaxation pattern is 20-bytes including the nop. */
#define NDS32_MAXCHAR 20
/* In current, the max entend number of instruction for one pseudo instruction
is 4, but its number of relocation may be 12. */
#define MAX_RELAX_NUM 4
#define MAX_RELAX_FIX 12
typedef struct nds32_relax_info
{
/* Opcode for the instruction. */
const char *opcode;
enum nds32_br_range br_range;
nds32_cond_field_t cond_field[MAX_RELAX_NUM]; /* TODO: Reuse nds32_field? */
/* Code sequences for different branch range. */
uint32_t relax_code_seq[BR_RANGE_NUM][MAX_RELAX_NUM];
nds32_cond_field_t relax_code_condition[BR_RANGE_NUM][MAX_RELAX_NUM];
unsigned int relax_code_size[BR_RANGE_NUM];
int relax_branch_isize[BR_RANGE_NUM];
nds32_relax_fixup_info_t relax_fixup[BR_RANGE_NUM][MAX_RELAX_FIX];
} relax_info_t;
enum nds32_relax_hint_type
{
NDS32_RELAX_HINT_NONE = 0,
NDS32_RELAX_HINT_LA,
NDS32_RELAX_HINT_LS
};
struct nds32_relax_hint_table
{
enum nds32_relax_hint_type main_type;
unsigned int relax_code_size;
uint32_t relax_code_seq[MAX_RELAX_NUM];
nds32_relax_fixup_info_t relax_fixup[MAX_RELAX_FIX];
};
#endif /* TC_NDS32 */
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