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Allow non-fatal errors to be emitted and for disassembly notes be placed on AArch64

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This patch adds a new platform option "notes" that can be used to indicate if
disassembly notes should be placed in the disassembly as comments.

These notes can contain information about a failing constraint such as reading
from a write-only register.  The disassembly will not be blocked because of this
but -M notes will emit a comment saying that the operation is not allowed.

For assembly this patch adds a new non-fatal status for errors.  This is
essentially a warning.  The reason for not creating an actual warning type is
that this causes the interaction between the ordering of warnings and errors to
be problematic.  Currently the error buffer is almost always filled because of
the way operands are matched during assembly. An earlier template may have put
an error there that would only be displayed if no other template matches or
generates a higher priority error.  But by definition a warning is lower
priority than a warning, so the error (which is incorrect if another template
matched) will supersede the warning.  By treating warnings as errors and only
later relaxing the severity this relationship keeps working and the existing
reporting infrastructure can be re-used.

binutils/

	PR binutils/21446
	* doc/binutils.texi (-M): Document AArch64 options.
	* NEWS: Document notes and warnings.

gas/

	PR binutils/21446
	* config/tc-aarch64.c (print_operands): Indicate no notes.
	(output_operand_error_record): Support non-fatal errors.
	(output_operand_error_report, warn_unpredictable_ldst, md_assemble):
	Likewise.

include/

	PR binutils/21446
	* opcode/aarch64.h (aarch64_operand_error): Add non_fatal.
	(aarch64_print_operand): Support notes.

opcodes/

	PR binutils/21446
	* aarch64-dis.c (no_notes: New.
	(parse_aarch64_dis_option): Support notes.
	(aarch64_decode_insn, print_operands): Likewise.
	(print_aarch64_disassembler_options): Document notes.
	* aarch64-opc.c (aarch64_print_operand): Support notes.
This commit is contained in:
Tamar Christina
2018-05-15 16:34:54 +01:00
parent 561a72d4dd
commit 7d02540ab7
10 changed files with 152 additions and 55 deletions
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4
include/opcode/aarch64.h
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@ -1101,6 +1101,7 @@ struct aarch64_operand_error
int index;
const char *error;
int data[3]; /* Some data for extra information. */
bfd_boolean non_fatal;
};
typedef struct aarch64_operand_error aarch64_operand_error;
@ -1125,7 +1126,8 @@ aarch64_get_opcode (enum aarch64_op);
/* Generate the string representation of an operand. */
extern void
aarch64_print_operand (char *, size_t, bfd_vma, const aarch64_opcode *,
const aarch64_opnd_info *, int, int *, bfd_vma *);
const aarch64_opnd_info *, int, int *, bfd_vma *,
char **);
/* Miscellaneous interface. */