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[ARC] Disassemble correctly extension instructions. 

For each MAJOR-MINOR opcode tuple, we can have either a 3-operand, or
2-operand, or a single operand instruction format, depending on the
values present in i-field, and a-field.

The disassembler is reading the section containing the extension
instruction format and stores them in a table.  Each table element
represents a linked list with encodings for a particular MAJOR-MINOR
tuple.

The current implementation checks only against the first element of
the list, hence, the issue.

This patch is walking the linked list until empty or finds an opcode
match.  It also adds a test outlining the found problem.

opcodes/
2016-09-15  Claudiu Zissulescu  <claziss@synopsys.com>

	* arc-dis.c (find_format): Walk the linked list pointed by einsn.

gas/
2016-09-15  Claudiu Zissulescu  <claziss@synopsys.com>

	* testsuite/gas/arc/textinsnxop.d: New file.
	* testsuite/gas/arc/textinsnxop.s: Likewise.
This commit is contained in:
Claudiu Zissulescu 2016-09-15 12:24:24 +02:00
parent 0a0df90827
commit f807f43d7e
5 changed files with 34 additions and 3 deletions
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5
gas/ChangeLog
View File

@ -1,3 +1,8 @@
2016-09-15 Claudiu Zissulescu <claziss@synopsys.com>
* testsuite/gas/arc/textinsnxop.d: New file.
* testsuite/gas/arc/textinsnxop.s: Likewise.
2016-09-15 Jose E. Marchesi <jose.marchesi@oracle.com>
* testsuite/gas/sparc/sparc.exp (gas_64_check): Run

12
gas/testsuite/gas/arc/textinsnxop.d Normal file
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@ -0,0 +1,12 @@
#objdump: -d
.*: +file format .*arc.*
Disassembly of section .text:
[0-9a-f]+ <start>:
0: 3921 0080 insn1 r0,r1,r2
4: 382f 0061 insn2 r0,r1
8: 392f 407f insn3 r1
c: 396f 403f insn4

10
gas/testsuite/gas/arc/textinsnxop.s Normal file
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@ -0,0 +1,10 @@
.extInstruction insn1, 7, 0x21, SUFFIX_NONE, SYNTAX_3OP
.extInstruction insn2, 7, 0x21, SUFFIX_NONE, SYNTAX_2OP
.extInstruction insn3, 7, 0x21, SUFFIX_NONE, SYNTAX_1OP
.extInstruction insn4, 7, 0x21, SUFFIX_NONE, SYNTAX_NOP
start:
insn1 r0,r1,r2
insn2 r0,r1
insn3 r1
insn4

4
opcodes/ChangeLog
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@ -1,3 +1,7 @@
2016-09-15 Claudiu Zissulescu <claziss@synopsys.com>
* arc-dis.c (find_format): Walk the linked list pointed by einsn.
2016-09-14 Peter Bergner <bergner@vnet.ibm.com>
* ppc-opc.c (powerpc_opcodes) <slbiag>: New mnemonic.

6
opcodes/arc-dis.c
View File

@ -477,15 +477,15 @@ find_format (bfd_vma memaddr,
{
const struct arc_opcode *opcode = NULL;
bfd_boolean needs_limm;
const extInstruction_t *einsn;
const extInstruction_t *einsn, *i;
/* First, try the extension instructions. */
einsn = arcExtMap_insn (OPCODE (insn[0]), insn[0]);
if (einsn != NULL)
for (i = einsn; (i != NULL) && (opcode == NULL); i = i->next)
{
const char *errmsg = NULL;
opcode = arcExtMap_genOpcode (einsn, isa_mask, &errmsg);
opcode = arcExtMap_genOpcode (i, isa_mask, &errmsg);
if (opcode == NULL)
{
(*info->fprintf_func) (info->stream, "\