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AArch64: Wire through instr_sequence

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This patch introduces aarch64_instr_sequence which is a structure similar to IT
blocks on Arm in order to track instructions that introduce a constraint or
dependency on instruction 1..N positions away from the instruction that opened
the block.

The struct is also wired through to the locations that require it.

gas/

	* config/tc-aarch64.c (now_instr_sequence):
	(*insn_sequence, now_instr_sequence): New.
	(output_operand_error_record, do_encode): Add insn_sequence.
	(md_assemble): Update insn_sequence.
	(try_to_encode_as_unscaled_ldst, fix_mov_imm_insn, fix_insn):
	Pass insn_sequence.
	* config/tc-aarch64.h (struct aarch64_segment_info_type):
	Add insn_sequence.

include/

	* opcode/aarch64.h (struct aarch64_instr_sequence): New.
	(aarch64_opcode_encode): Use it.

opcodes/

	* aarch64-asm.c (aarch64_opcode_encode): Add insn_sequence.
	* aarch64-dis.c (insn_sequence): New.
This commit is contained in:
Tamar Christina
2018-10-03 18:27:52 +01:00
parent eae424aef0
commit 7e84b55d8f
8 changed files with 71 additions and 11 deletions
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24
include/opcode/aarch64.h
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@ -662,6 +662,13 @@ empty_qualifier_sequence_p (const aarch64_opnd_qualifier_t *qualifiers)
return TRUE;
}
/* Forward declare error reporting type. */
typedef struct aarch64_operand_error aarch64_operand_error;
/* Forward declare instruction sequence type. */
typedef struct aarch64_instr_sequence aarch64_instr_sequence;
/* Forward declare instruction definition. */
typedef struct aarch64_inst aarch64_inst;
/* This structure holds information for a particular opcode. */
struct aarch64_opcode
@ -1124,14 +1131,27 @@ struct aarch64_operand_error
bfd_boolean non_fatal;
};
typedef struct aarch64_operand_error aarch64_operand_error;
/* AArch64 sequence structure used to track instructions with F_SCAN
dependencies for both assembler and disassembler. */
struct aarch64_instr_sequence
{
/* The instruction that caused this sequence to be opened. */
aarch64_inst *instr;
/* The number of instructions the above instruction allows to be kept in the
sequence before an automatic close is done. */
int num_insns;
/* The instructions currently added to the sequence. */
aarch64_inst **current_insns;
/* The number of instructions already in the sequence. */
int next_insn;
};
/* Encoding entrypoint. */
extern int
aarch64_opcode_encode (const aarch64_opcode *, const aarch64_inst *,
aarch64_insn *, aarch64_opnd_qualifier_t *,
aarch64_operand_error *);
aarch64_operand_error *, aarch64_instr_sequence *);
extern const aarch64_opcode *
aarch64_replace_opcode (struct aarch64_inst *,