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opcodes/arc: Move instruction length logic to new function 

Move the logic that calculates the instruction length out to a new
function.  Restructure the code to make it simpler.

opcodes/ChangeLog:

	* arc-dis.c (arc_insn_length): New function.
	(print_insn_arc): Use arc_insn_length, change insnLen to unsigned.
	(find_format): Change insnLen parameter to unsigned.
This commit is contained in:
Andrew Burgess 2016-03-24 16:54:37 +00:00
parent 7634c4e679
commit cb040366b3
2 changed files with 50 additions and 13 deletions
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6
opcodes/ChangeLog
View File

@ -1,3 +1,9 @@
2016-04-14 Andrew Burgess <andrew.burgess@embecosm.com>
* arc-dis.c (arc_insn_length): New function.
(print_insn_arc): Use arc_insn_length, change insnLen to unsigned.
(find_format): Change insnLen parameter to unsigned.
2016-04-13 Nick Clifton <nickc@redhat.com>
PR target/19937

57
opcodes/arc-dis.c
View File

@ -105,7 +105,7 @@ special_flag_p (const char *opname,
/* Find proper format for the given opcode. */
static const struct arc_opcode *
find_format (const struct arc_opcode *arc_table,
unsigned *insn, int insnLen,
unsigned *insn, unsigned int insnLen,
unsigned isa_mask)
{
unsigned int i = 0;
@ -309,6 +309,37 @@ get_auxreg (const struct arc_opcode *opcode,
}
return NULL;
}
/* Calculate the instruction length for an instruction starting with MSB
and LSB, the most and least significant byte. The ISA_MASK is used to
filter the instructions considered to only those that are part of the
current architecture.
The instruction lengths are calculated from the ARC_OPCODE table, and
cached for later use. */
static unsigned int
arc_insn_length (bfd_byte msb, struct disassemble_info *info)
{
bfd_byte major_opcode = msb >> 3;
switch (info->mach)
{
case bfd_mach_arc_nps400:
case bfd_mach_arc_arc700:
case bfd_mach_arc_arc600:
return (major_opcode > 0xb) ? 2 : 4;
break;
case bfd_mach_arc_arcv2:
return (major_opcode > 0x7) ? 2 : 4;
break;
default:
abort ();
}
}
/* Disassemble ARC instructions. */
static int
@ -318,7 +349,7 @@ print_insn_arc (bfd_vma memaddr,
bfd_byte buffer[4];
unsigned int lowbyte, highbyte;
int status;
int insnLen = 0;
unsigned int insnLen;
unsigned insn[2] = { 0, 0 };
unsigned isa_mask;
const unsigned char *opidx;
@ -422,20 +453,19 @@ print_insn_arc (bfd_vma memaddr,
return size;
}
if ((((buffer[lowbyte] & 0xf8) > 0x38)
&& ((buffer[lowbyte] & 0xf8) != 0x48))
|| ((info->mach == bfd_mach_arc_arcv2)
&& ((buffer[lowbyte] & 0xF8) == 0x48)) /* FIXME! ugly. */
)
insnLen = arc_insn_length (buffer[lowbyte], info);
switch (insnLen)
{
/* This is a short instruction. */
insnLen = 2;
case 2:
insn[0] = (buffer[lowbyte] << 8) | buffer[highbyte];
}
else
{
insnLen = 4;
break;
default:
/* An unknown instruction is treated as being length 4. This is
possibly not the best solution, but matches the behaviour that was
in place before the table based instruction length look-up was
introduced. */
case 4:
/* This is a long instruction: Read the remaning 2 bytes. */
status = (*info->read_memory_func) (memaddr + 2, &buffer[2], 2, info);
if (status != 0)
@ -444,6 +474,7 @@ print_insn_arc (bfd_vma memaddr,
return -1;
}
insn[0] = ARRANGE_ENDIAN (info, buffer);
break;
}
/* Set some defaults for the insn info. */