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Diffstat (limited to 'gas/config/tc-xtensa.h')
| -rw-r--r-- | gas/config/tc-xtensa.h | 431 |
1 files changed, 0 insertions, 431 deletions
diff --git a/gas/config/tc-xtensa.h b/gas/config/tc-xtensa.h deleted file mode 100644 index 71f1ebb..0000000 --- a/gas/config/tc-xtensa.h +++ /dev/null @@ -1,431 +0,0 @@ -/* tc-xtensa.h -- Header file for tc-xtensa.c. - Copyright (C) 2003, 2004, 2005 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 2, 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_XTENSA -#define TC_XTENSA 1 - -struct fix; - -#ifndef OBJ_ELF -#error Xtensa support requires ELF object format -#endif - -#include "xtensa-isa.h" -#include "xtensa-config.h" - -#define TARGET_BYTES_BIG_ENDIAN XCHAL_HAVE_BE - - -/* Maximum number of opcode slots in a VLIW instruction. */ -#define MAX_SLOTS 15 - - -/* For all xtensa relax states except RELAX_DESIRE_ALIGN and - RELAX_DESIRE_ALIGN_IF_TARGET, the amount a frag might grow is stored - in the fr_var field. For the two exceptions, fr_var is a float value - that records the frequency with which the following instruction is - executed as a branch target. The aligner uses this information to - tell which targets are most important to be aligned. */ - -enum xtensa_relax_statesE -{ - RELAX_ALIGN_NEXT_OPCODE, - /* Use the first opcode of the next fragment to determine the - alignment requirements. This is ONLY used for LOOPs currently. */ - - RELAX_CHECK_ALIGN_NEXT_OPCODE, - /* The next non-empty frag contains a loop instruction. Check to see - if it is correctly aligned, but do not align it. */ - - RELAX_DESIRE_ALIGN_IF_TARGET, - /* These are placed in front of labels and converted to either - RELAX_DESIRE_ALIGN / RELAX_LOOP_END or rs_fill of 0 before - relaxation begins. */ - - RELAX_ADD_NOP_IF_A0_B_RETW, - /* These are placed in front of conditional branches. Before - relaxation begins, they are turned into either NOPs for branches - immediately followed by RETW or RETW.N or rs_fills of 0. This is - used to avoid a hardware bug in some early versions of the - processor. */ - - RELAX_ADD_NOP_IF_PRE_LOOP_END, - /* These are placed after JX instructions. Before relaxation begins, - they are turned into either NOPs, if the JX is one instruction - before a loop end label, or rs_fills of 0. This is used to avoid a - hardware interlock issue prior to Xtensa version T1040. */ - - RELAX_ADD_NOP_IF_SHORT_LOOP, - /* These are placed after LOOP instructions and turned into NOPs when: - (1) there are less than 3 instructions in the loop; we place 2 of - these in a row to add up to 2 NOPS in short loops; or (2) the - instructions in the loop do not include a branch or jump. - Otherwise they are turned into rs_fills of 0 before relaxation - begins. This is used to avoid hardware bug PR3830. */ - - RELAX_ADD_NOP_IF_CLOSE_LOOP_END, - /* These are placed after LOOP instructions and turned into NOPs if - there are less than 12 bytes to the end of some other loop's end. - Otherwise they are turned into rs_fills of 0 before relaxation - begins. This is used to avoid hardware bug PR3830. */ - - RELAX_DESIRE_ALIGN, - /* The next fragment would like its first instruction to NOT cross an - instruction fetch boundary. */ - - RELAX_MAYBE_DESIRE_ALIGN, - /* The next fragment might like its first instruction to NOT cross an - instruction fetch boundary. These are placed after a branch that - might be relaxed. If the branch is relaxed, then this frag will be - a branch target and this frag will be changed to RELAX_DESIRE_ALIGN - frag. */ - - RELAX_LOOP_END, - /* This will be turned into a NOP or NOP.N if the previous instruction - is expanded to negate a loop. */ - - RELAX_LOOP_END_ADD_NOP, - /* When the code density option is available, this will generate a - NOP.N marked RELAX_NARROW. Otherwise, it will create an rs_fill - fragment with a NOP in it. */ - - RELAX_LITERAL, - /* Another fragment could generate an expansion here but has not yet. */ - - RELAX_LITERAL_NR, - /* Expansion has been generated by an instruction that generates a - literal. However, the stretch has NOT been reported yet in this - fragment. */ - - RELAX_LITERAL_FINAL, - /* Expansion has been generated by an instruction that generates a - literal. */ - - RELAX_LITERAL_POOL_BEGIN, - RELAX_LITERAL_POOL_END, - /* Technically these are not relaxations at all but mark a location - to store literals later. Note that fr_var stores the frchain for - BEGIN frags and fr_var stores now_seg for END frags. */ - - RELAX_NARROW, - /* The last instruction in this fragment (at->fr_opcode) can be - freely replaced with a single wider instruction if a future - alignment desires or needs it. */ - - RELAX_IMMED, - /* The last instruction in this fragment (at->fr_opcode) contains - the value defined by fr_symbol (fr_offset = 0). If the value - does not fit, use the specified expansion. This is similar to - "NARROW", except that these may not be expanded in order to align - code. */ - - RELAX_IMMED_STEP1, - /* The last instruction in this fragment (at->fr_opcode) contains a - literal. It has already been expanded at least 1 step. */ - - RELAX_IMMED_STEP2, - /* The last instruction in this fragment (at->fr_opcode) contains a - literal. It has already been expanded at least 2 steps. */ - - RELAX_SLOTS, - /* There are instructions within the last VLIW instruction that need - relaxation. Find the relaxation based on the slot info in - xtensa_frag_type. Relaxations that deal with particular opcodes - are slot-based (e.g., converting a MOVI to an L32R). Relaxations - that deal with entire instructions, such as alignment, are not - slot-based. */ - - RELAX_FILL_NOP, - /* This marks the location of a pipeline stall. We can fill these guys - in for alignment of any size. */ - - RELAX_UNREACHABLE, - /* This marks the location as unreachable. The assembler may widen or - narrow this area to meet alignment requirements of nearby - instructions. */ - - RELAX_MAYBE_UNREACHABLE, - /* This marks the location as possibly unreachable. These are placed - after a branch that may be relaxed into a branch and jump. If the - branch is relaxed, then this frag will be converted to a - RELAX_UNREACHABLE frag. */ - - RELAX_NONE -}; - -/* This is used as a stopper to bound the number of steps that - can be taken. */ -#define RELAX_IMMED_MAXSTEPS (RELAX_IMMED_STEP2 - RELAX_IMMED) - -struct xtensa_frag_type -{ - /* Info about the current state of assembly, e.g., transform, - absolute_literals, etc. These need to be passed to the backend and - then to the object file. - - When is_assembly_state_set is false, the frag inherits some of the - state settings from the previous frag in this segment. Because it - is not possible to intercept all fragment closures (frag_more and - frag_append_1_char can close a frag), we use a pass after initial - assembly to fill in the assembly states. */ - - unsigned int is_assembly_state_set : 1; - unsigned int is_no_density : 1; - unsigned int is_no_transform : 1; - unsigned int use_longcalls : 1; - unsigned int use_absolute_literals : 1; - - /* Inhibits relaxation of machine-dependent alignment frags the - first time through a relaxation.... */ - unsigned int relax_seen : 1; - - /* Information that is needed in the object file and set when known. */ - unsigned int is_literal : 1; - unsigned int is_loop_target : 1; - unsigned int is_branch_target : 1; - unsigned int is_insn : 1; - unsigned int is_unreachable : 1; - - unsigned int is_specific_opcode : 1; /* also implies no_transform */ - - unsigned int is_align : 1; - unsigned int is_text_align : 1; - unsigned int alignment : 5; - - /* A frag with this bit set is the first in a loop that actually - contains an instruction. */ - unsigned int is_first_loop_insn : 1; - - /* A frag with this bit set is a branch that we are using to - align branch targets as if it were a normal narrow instruction. */ - unsigned int is_aligning_branch : 1; - - /* For text fragments that can generate literals at relax time, this - variable points to the frag where the literal will be stored. For - literal frags, this variable points to the nearest literal pool - location frag. This literal frag will be moved to after this - location. */ - fragS *literal_frag; - - /* The destination segment for literal frags. (Note that this is only - valid after xtensa_move_literals.) This field is also used for - LITERAL_POOL_END frags. */ - segT lit_seg; - - /* Frag chain for LITERAL_POOL_BEGIN frags. */ - struct frchain *lit_frchain; - - /* For the relaxation scheme, some literal fragments can have their - expansions modified by an instruction that relaxes. */ - int text_expansion[MAX_SLOTS]; - int literal_expansion[MAX_SLOTS]; - int unreported_expansion; - - /* For text fragments that can generate literals at relax time: */ - fragS *literal_frags[MAX_SLOTS]; - enum xtensa_relax_statesE slot_subtypes[MAX_SLOTS]; - symbolS *slot_symbols[MAX_SLOTS]; - offsetT slot_offsets[MAX_SLOTS]; - - /* The global aligner needs to walk backward through the list of - frags. This field is only valid after xtensa_end. */ - fragS *fr_prev; -}; - - -/* For VLIW support, we need to know what slot a fixup applies to. */ -typedef struct xtensa_fix_data_struct -{ - int slot; - symbolS *X_add_symbol; - offsetT X_add_number; -} xtensa_fix_data; - - -/* Structure to record xtensa-specific symbol information. */ -typedef struct xtensa_symfield_type -{ - unsigned int is_loop_target : 1; - unsigned int is_branch_target : 1; -} xtensa_symfield_type; - - -/* Structure for saving information about a block of property data - for frags that have the same flags. The forward reference is - in this header file. The actual definition is in tc-xtensa.c. */ -struct xtensa_block_info_struct; -typedef struct xtensa_block_info_struct xtensa_block_info; - - -/* Property section types. */ -typedef enum -{ - xt_literal_sec, - xt_prop_sec, - max_xt_sec -} xt_section_type; - -typedef struct xtensa_segment_info_struct -{ - fragS *literal_pool_loc; - xtensa_block_info *blocks[max_xt_sec]; -} xtensa_segment_info; - - -extern const char *xtensa_target_format (void); -extern void xtensa_init_fix_data (struct fix *); -extern void xtensa_frag_init (fragS *); -extern int xtensa_force_relocation (struct fix *); -extern int xtensa_validate_fix_sub (struct fix *); -extern void xtensa_frob_label (struct symbol *); -extern void xtensa_end (void); -extern void xtensa_post_relax_hook (void); -extern void xtensa_file_arch_init (bfd *); -extern void xtensa_flush_pending_output (void); -extern bfd_boolean xtensa_fix_adjustable (struct fix *); -extern void xtensa_symbol_new_hook (symbolS *); -extern long xtensa_relax_frag (fragS *, long, int *); -extern void xtensa_elf_section_change_hook (void); -extern int xtensa_unrecognized_line (int); -extern bfd_boolean xtensa_check_inside_bundle (void); -extern void xtensa_handle_align (fragS *); -extern char *xtensa_section_rename (char *); - -#define TARGET_FORMAT xtensa_target_format () -#define TARGET_ARCH bfd_arch_xtensa -#define TC_SEGMENT_INFO_TYPE xtensa_segment_info -#define TC_SYMFIELD_TYPE struct xtensa_symfield_type -#define TC_FIX_TYPE xtensa_fix_data -#define TC_INIT_FIX_DATA(x) xtensa_init_fix_data (x) -#define TC_FRAG_TYPE struct xtensa_frag_type -#define TC_FRAG_INIT(frag) xtensa_frag_init (frag) -#define TC_FORCE_RELOCATION(fix) xtensa_force_relocation (fix) -#define TC_FORCE_RELOCATION_SUB_SAME(fix, seg) \ - (! SEG_NORMAL (seg) || xtensa_force_relocation (fix)) -#define TC_VALIDATE_FIX_SUB(fix) xtensa_validate_fix_sub (fix) -#define NO_PSEUDO_DOT xtensa_check_inside_bundle () -#define tc_canonicalize_symbol_name(s) xtensa_section_rename (s) -#define tc_canonicalize_section_name(s) xtensa_section_rename (s) -#define tc_init_after_args() xtensa_file_arch_init (stdoutput) -#define tc_fix_adjustable(fix) xtensa_fix_adjustable (fix) -#define tc_frob_label(sym) xtensa_frob_label (sym) -#define tc_unrecognized_line(ch) xtensa_unrecognized_line (ch) -#define md_do_align(a,b,c,d,e) xtensa_flush_pending_output () -#define md_elf_section_change_hook xtensa_elf_section_change_hook -#define md_end xtensa_end -#define md_flush_pending_output() xtensa_flush_pending_output () -#define md_operand(x) -#define TEXT_SECTION_NAME xtensa_section_rename (".text") -#define DATA_SECTION_NAME xtensa_section_rename (".data") -#define BSS_SECTION_NAME xtensa_section_rename (".bss") -#define HANDLE_ALIGN(fragP) xtensa_handle_align (fragP) -#define MAX_MEM_FOR_RS_ALIGN_CODE 1 - - -/* The renumber_section function must be mapped over all the sections - after calling xtensa_post_relax_hook. That function is static in - write.c so it cannot be called from xtensa_post_relax_hook itself. */ - -#define md_post_relax_hook \ - do \ - { \ - int i = 0; \ - xtensa_post_relax_hook (); \ - bfd_map_over_sections (stdoutput, renumber_sections, &i); \ - } \ - while (0) - - -/* Because xtensa relaxation can insert a new literal into the middle of - fragment and thus require re-running the relaxation pass on the - section, we need an explicit flag here. We explicitly use the name - "stretched" here to avoid changing the source code in write.c. */ - -#define md_relax_frag(segment, fragP, stretch) \ - xtensa_relax_frag (fragP, stretch, &stretched) - - -#define LOCAL_LABELS_FB 1 -#define WORKING_DOT_WORD 1 -#define DOUBLESLASH_LINE_COMMENTS -#define TC_HANDLES_FX_DONE -#define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 0 -#define TC_LINKRELAX_FIXUP(SEG) 0 -#define MD_APPLY_SYM_VALUE(FIX) 0 -#define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0 - - -/* Resource reservation info functions. */ - -/* Returns the number of copies of a particular unit. */ -typedef int (*unit_num_copies_func) (void *, xtensa_funcUnit); - -/* Returns the number of units the opcode uses. */ -typedef int (*opcode_num_units_func) (void *, xtensa_opcode); - -/* Given an opcode and an index into the opcode's funcUnit list, - returns the unit used for the index. */ -typedef int (*opcode_funcUnit_use_unit_func) (void *, xtensa_opcode, int); - -/* Given an opcode and an index into the opcode's funcUnit list, - returns the cycle during which the unit is used. */ -typedef int (*opcode_funcUnit_use_stage_func) (void *, xtensa_opcode, int); - -/* The above typedefs parameterize the resource_table so that the - optional scheduler doesn't need its own resource reservation system. - - For simple resource checking, which is all that happens normally, - the functions will be as follows (with some wrapping to make the - interface more convenient): - - unit_num_copies_func = xtensa_funcUnit_num_copies - opcode_num_units_func = xtensa_opcode_num_funcUnit_uses - opcode_funcUnit_use_unit_func = xtensa_opcode_funcUnit_use->unit - opcode_funcUnit_use_stage_func = xtensa_opcode_funcUnit_use->stage - - Of course the optional scheduler has its own reservation table - and functions. */ - -int opcode_funcUnit_use_unit (void *, xtensa_opcode, int); -int opcode_funcUnit_use_stage (void *, xtensa_opcode, int); - -typedef struct -{ - void *data; - int cycles; - int allocated_cycles; - int num_units; - unit_num_copies_func unit_num_copies; - opcode_num_units_func opcode_num_units; - opcode_funcUnit_use_unit_func opcode_unit_use; - opcode_funcUnit_use_stage_func opcode_unit_stage; - unsigned char **units; -} resource_table; - -resource_table *new_resource_table - (void *, int, int, unit_num_copies_func, opcode_num_units_func, - opcode_funcUnit_use_unit_func, opcode_funcUnit_use_stage_func); -void resize_resource_table (resource_table *, int); -void clear_resource_table (resource_table *); -bfd_boolean resources_available (resource_table *, xtensa_opcode, int); -void reserve_resources (resource_table *, xtensa_opcode, int); -void release_resources (resource_table *, xtensa_opcode, int); - -#endif /* TC_XTENSA */ |