Add support for ARC instruction relaxation in the assembler.

gas/
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>
	    Janek van Oirschot <jvanoirs@synopsys.com>

        * config/tc-arc.h (TC_FRAG_TYPE, TC_PCREL_ADJUST, MAX_INSN_ARGS)
        (MAX_INSN_FLGS, MAX_FLAG_NAME_LENGHT, TC_GENERIC_RELAX_TABLE):
        Define.
        (arc_flags, arc_relax_type): New structure.
        * config/tc-arc.c (FRAG_MAX_GROWTH, RELAX_TABLE_ENTRY)
	(RELAX_TABLE_ENTRY_MAX): New define.
        (relaxation_state, md_relax_table, arc_relaxable_insns)
	(arc_num_relaxable_ins): New variable.
	(rlx_operand_type, arc_rlx_types): New enums.
	(arc_relaxable_ins): New structure.
        (OPTION_RELAX): New option.
        (arc_insn): New relax member.
        (arc_flags): Remove.
        (relax_insn_p): New function.
        (apply_fixups): Likewise.
        (relaxable_operand): Likewise.
        (may_relax_expr): Likewise.
        (relaxable_flag): Likewise.
        (arc_pcrel_adjust): Likewise.
        (md_estimate_size_before_relax): Implement.
        (md_convert_frag): Likewise.
        (md_parse_option): Handle new mrelax option.
        (md_show_usage): Likewise.
        (assemble_insn): Set relax member.
        (emit_insn0): New function.
        (emit_insn1): Likewise.
        (emit_insn): Handle relaxation case.
	* NEWS: Mention the new relaxation option.
	* doc/c-arc.texi (ARC Options): Document new mrelax option.

gas/testsuite
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>

        * gas/arc/relax-avoid1.d: New file.
        * gas/arc/relax-avoid1.s: Likewise.
        * gas/arc/relax-avoid2.d: Likewise.
        * gas/arc/relax-avoid2.s: Likewise.
        * gas/arc/relax-avoid3.d: Likewise.
        * gas/arc/relax-avoid3.s: Likewise.
	* gas/arc/relax-b.d: Likewise.
        * gas/arc/relax-b.s: Likewise.

include/opcode/
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>
	    Janek van Oirschot  <jvanoirs@synopsys.com>

        * arc.h (arc_opcode arc_relax_opcodes, arc_num_relax_opcodes):
        Declare.

opcodes/
2016-01-26  Claudiu Zissulescu  <claziss@synopsys.com>
	    Janek van Oirschot  <jvanoirs@synopsys.com>

        * arc-opc.c (arc_relax_opcodes, arc_num_relax_opcodes): New
        variable.

1 files changed, 56 insertions, 0 deletions

diff --git a/gas/config/tc-arc.h b/gas/config/tc-arc.h
index ca5b152..acd007b 100644
--- a/gas/config/tc-arc.h
+++ b/gas/config/tc-arc.h
@@ -177,6 +177,14 @@ extern long md_pcrel_from_section (struct fix *, segT);
 /* This hook is required to parse register names as operands.  */
 #define md_parse_name(name, exp, m, c) arc_parse_name (name, exp)
 
+/* Used within frags to pass some information to some relaxation
+   machine dependent values.  */
+#define TC_FRAG_TYPE struct arc_relax_type
+
+/* Adjust non PC-rel values at relaxation time.  */
+#define TC_PCREL_ADJUST(F) arc_pcrel_adjust (F)
+
+extern int arc_pcrel_adjust (fragS *);
 extern bfd_boolean arc_parse_name (const char *, struct expressionS *);
 extern int tc_arc_fix_adjustable (struct fix *);
 extern void arc_handle_align (fragS *);
@@ -193,3 +201,51 @@ extern void arc_frob_label (symbolS *);
 #define NOP_OPCODE_S   0x000078E0
 #define NOP_OPCODE_L   0x264A7000 /* mov 0,0.  */
 
+#define MAX_FLAG_NAME_LENGHT 3
+
+struct arc_flags
+{
+  /* Name of the parsed flag.  */
+  char name[MAX_FLAG_NAME_LENGHT + 1];
+
+  /* The code of the parsed flag.  Valid when is not zero.  */
+  unsigned char code;
+};
+
+#ifndef MAX_INSN_ARGS
+#define MAX_INSN_ARGS	     6
+#endif
+
+#ifndef MAX_INSN_FLGS
+#define MAX_INSN_FLGS	     3
+#endif
+
+extern const relax_typeS md_relax_table[];
+#define TC_GENERIC_RELAX_TABLE md_relax_table
+
+/* Used to construct instructions at md_convert_frag stage of
+   relaxation.  */
+struct arc_relax_type
+{
+  /* Dictates whether the pc-relativity should be kept in mind when
+     relax_frag is called or whether the pc-relativity should be
+     solved outside of relaxation.  For clarification: BL(_S) and
+     B(_S) use pcrel == 1 and ADD with a solvable expression as 3rd
+     operand use pcrel == 0.  */
+  unsigned char pcrel;
+
+  /* Expressions that dictate the operands.  Used for re-assembling in
+     md_convert_frag.  */
+  expressionS tok[MAX_INSN_ARGS];
+
+  /* Number of tok (i.e. number of operands).  Used for re-assembling
+     in md_convert_frag.  */
+  int ntok;
+
+  /* Flags of instruction.  Used for re-assembling in
+     md_convert_frag.  */
+  struct arc_flags pflags[MAX_INSN_FLGS];
+
+  /* Number of flags.  Used for re-assembling in md_convert_frag.  */
+  int nflg;
+};