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Add instruction_reader to arm process record

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This patch adds an abstract class abstract_memory_reader a
and pass it to the code reading instructions in arm process record,
rather than using target_read_memory to read from real target.  This
paves the way for adding more unit tests to arm process record.

gdb:

2017-03-16  Yao Qi  <yao.qi@linaro.org>

	* arm-tdep.c (abstract_memory_reader): New class.
	(instruction_reader): New class.
	(extract_arm_insn): Add argument 'reader'.  Callers updated.
	(decode_insn): Likewise.
This commit is contained in:
Yao Qi 2017-03-16 16:35:18 +00:00
parent a7c0469f99
commit 728a79135f
2 changed files with 44 additions and 9 deletions
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7
gdb/ChangeLog
View file

@ -1,3 +1,10 @@
2017-03-16 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (abstract_memory_reader): New class.
(instruction_reader): New class.
(extract_arm_insn): Add argument 'reader'. Callers updated.
(decode_insn): Likewise.
2017-03-16 Doug Evans <dje@google.com>
* guile/scm-lazy-string.c (lazy_string_smob): Clarify use of LENGTH

46
gdb/arm-tdep.c
View file

@ -12905,17 +12905,43 @@ thumb2_record_decode_insn_handler (insn_decode_record *thumb2_insn_r)
return -1;
}
/* Abstract memory reader. */
class abstract_memory_reader
{
public:
/* Read LEN bytes of target memory at address MEMADDR, placing the
results in GDB's memory at BUF. Return true on success. */
virtual bool read (CORE_ADDR memaddr, gdb_byte *buf, const size_t len) = 0;
};
/* Instruction reader from real target. */
class instruction_reader : public abstract_memory_reader
{
public:
bool read (CORE_ADDR memaddr, gdb_byte *buf, const size_t len)
{
if (target_read_memory (memaddr, buf, len))
return false;
else
return true;
}
};
/* Extracts arm/thumb/thumb2 insn depending on the size, and returns 0 on success
and positive val on fauilure. */
static int
extract_arm_insn (insn_decode_record *insn_record, uint32_t insn_size)
extract_arm_insn (abstract_memory_reader& reader,
insn_decode_record *insn_record, uint32_t insn_size)
{
gdb_byte buf[insn_size];
memset (&buf[0], 0, insn_size);
if (target_read_memory (insn_record->this_addr, &buf[0], insn_size))
if (!reader.read (insn_record->this_addr, buf, insn_size))
return 1;
insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0],
insn_size,
@ -12929,8 +12955,8 @@ typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*);
dispatch it. */
static int
decode_insn (insn_decode_record *arm_record, record_type_t record_type,
uint32_t insn_size)
decode_insn (abstract_memory_reader &reader, insn_decode_record *arm_record,
record_type_t record_type, uint32_t insn_size)
{
/* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm
@ -12964,7 +12990,7 @@ decode_insn (insn_decode_record *arm_record, record_type_t record_type,
uint32_t ret = 0; /* return value: negative:failure 0:success. */
uint32_t insn_id = 0;
if (extract_arm_insn (arm_record, insn_size))
if (extract_arm_insn (reader, arm_record, insn_size))
{
if (record_debug)
{
@ -13073,7 +13099,8 @@ arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
paddress (gdbarch, arm_record.this_addr));
}
if (extract_arm_insn (&arm_record, 2))
instruction_reader reader;
if (extract_arm_insn (reader, &arm_record, 2))
{
if (record_debug)
{
@ -13094,7 +13121,7 @@ arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
if (!(u_regval & t_bit))
{
/* We are decoding arm insn. */
ret = decode_insn (&arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES);
ret = decode_insn (reader, &arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES);
}
else
{
@ -13102,13 +13129,14 @@ arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
/* is it thumb2 insn? */
if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id))
{
ret = decode_insn (&arm_record, THUMB2_RECORD,
ret = decode_insn (reader, &arm_record, THUMB2_RECORD,
THUMB2_INSN_SIZE_BYTES);
}
else
{
/* We are decoding thumb insn. */
ret = decode_insn (&arm_record, THUMB_RECORD, THUMB_INSN_SIZE_BYTES);
ret = decode_insn (reader, &arm_record, THUMB_RECORD,
THUMB_INSN_SIZE_BYTES);
}
}