Add support for the LMBD (left-most bit detect) instruction to the PRU assembler.

include	* opcode/pru.h: Add LMBD (left-most bit detect) opcode index
opcodes * pru-opc.c: Add opcode description for LMBD (left-most bit detect)
gas 	* testsuite/gas/pru/misc.s: Add tests for lmbd (left-most bit detect)
 	* testsuite/gas/pru/misc.d: Add tests for lmbd (left-most bit

gas/ChangeLog

@@ -1,3 +1,9 @@
+2020-11-09  Spencer E. Olson  <olsonse@umich.edu>
+
+	* testsuite/gas/pru/misc.s: Add tests for lmbd (left-most bit
+	detect).
+	* testsuite/gas/pru/misc.d: Update expected disassembly.
+
 2020-11-09  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
 
 	* config/tc-aarch64.c: Fix comment.

gas/testsuite/gas/pru/misc.d

@@ -9,3 +9,6 @@ Disassembly of section .text:
 0+0000 <[^>]*> 2a000000 	halt
 0+0004 <[^>]*> 3e800000 	slp	1
 0+0008 <[^>]*> 3e000000 	slp	0
+0+000c <[^>]*> 2701e1e0 	lmbd	r0, r1, 1
+0+0010 <[^>]*> 2700e100 	lmbd	r0.b0, r1, 0
+0+0014 <[^>]*> 2642e1e0 	lmbd	r0, r1, sp.b2

gas/testsuite/gas/pru/misc.s

@@ -4,3 +4,6 @@ foo:
 	halt
 	slp	1
 	slp	0
+	lmbd r0, r1, 0x1
+	lmbd r0.b0, r1, 0x0
+	lmbd r0, r1, r2.b2

gas/write.c

@@ -771,6 +771,22 @@ resolve_reloc_expr_symbols (void)
     }
 }
 
+static bfd_boolean
+is_dwo_section (asection *sec)
+{
+  const char *name;
+  int len;
+
+  if (sec == NULL || (name = bfd_section_name (sec)) == NULL)
+    return FALSE;
+
+  len = strlen (name);
+  if (len < 5)
+    return FALSE;
+
+  return strncmp (name + len - 4, ".dwo", 4) == 0;
+}
+
 /* This pass over fixups decides whether symbols can be replaced with
    section symbols.  */
 
@@ -899,6 +915,14 @@ adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
 #endif
       }
 
+  /* PR 26841: DWO sections are not supposed to have relocations.  */
+  if (is_dwo_section (sec) && seginfo->fix_root != NULL)
+    {
+      as_bad (_("DWO section '%s' contains unresolved expressions - this is not allowed"),
+	      bfd_section_name (sec));
+      seginfo->fix_root = NULL; /* FIXME: Memory leak ?  */
+    }
+
   dump_section_relocs (abfd, sec, stderr);
 }
 

include/ChangeLog

@@ -1,3 +1,7 @@
+2020-11-09  Spencer E. Olson  <olsonse@umich.edu>
+
+	* opcode/pru.h: Add LMBD (left-most bit detect) opcode index.
+
 2020-11-09  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
 
 	* opcode/aarch64.h (enum aarch64_opnd): Add new operand AARCH64_OPND_Rt_LS64.

include/opcode/pru.h

@@ -44,25 +44,27 @@ enum overflow_type
   no_overflow
 };
 
-enum opcode_format_type {
+enum opcode_format_type
-    opcode_format1,
+{
-    opcode_format2ab,
+  opcode_format1,
-    opcode_format2abl,
+  opcode_format2ab,
-    opcode_format2c,
+  opcode_format2abl,
-    opcode_format2de,
+  opcode_format2c,
-    opcode_format45,
+  opcode_format2de,
-    opcode_format6
+  opcode_format45,
+  opcode_format6
 };
 
 /* Opcode ID listing. Used for indexing by the simulator.  */
-enum pru_instr_type {
+enum pru_instr_type
-    prui_add, prui_adc, prui_sub, prui_suc, prui_lsl, prui_lsr, prui_rsb,
+{
-    prui_rsc, prui_and, prui_or,  prui_xor, prui_min, prui_max, prui_clr,
+  prui_add, prui_adc, prui_sub, prui_suc, prui_lsl, prui_lsr, prui_rsb,
-    prui_set, prui_not, prui_jmp, prui_jal, prui_ldi, prui_halt, prui_slp,
+  prui_rsc, prui_and, prui_or,  prui_xor, prui_min, prui_max, prui_clr,
-    prui_xin, prui_xout, prui_xchg, prui_sxin, prui_sxout, prui_sxchg,
+  prui_set, prui_not, prui_jmp, prui_jal, prui_ldi, prui_lmbd,
-    prui_loop, prui_iloop, prui_qbgt, prui_qbge, prui_qblt, prui_qble,
+  prui_halt, prui_slp, prui_xin, prui_xout, prui_xchg, prui_sxin,
-    prui_qbeq, prui_qbne, prui_qba, prui_qbbs, prui_qbbc, prui_lbbo,
+  prui_sxout, prui_sxchg, prui_loop, prui_iloop, prui_qbgt, prui_qbge,
-    prui_sbbo, prui_lbco, prui_sbco
+  prui_qblt, prui_qble, prui_qbeq, prui_qbne, prui_qba, prui_qbbs,
+  prui_qbbc, prui_lbbo, prui_sbbo, prui_lbco, prui_sbco
 };
 
 /* This structure holds information for a particular instruction.

opcodes/ChangeLog

@@ -1,3 +1,8 @@
+2020-11-09  Spencer E. Olson  <olsonse@umich.edu>
+
+	* pru-opc.c: Add opcode description for LMBD (left-most bit
+	detect).
+
 2020-11-09  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
 
 	* aarch64-opc.c: Add ACCDATA_EL1 system register

opcodes/pru-opc.c

@@ -121,6 +121,8 @@ const struct pru_opcode pru_opcodes[] =
    OP_MATCH_JAL, OP_MASK_FMT2_OP | OP_MASK_SUBOP, 0, unsigned_immed16_overflow},
   { "ldi", prui_ldi, "d,W",
    OP_MATCH_LDI, OP_MASK_FMT2_OP | OP_MASK_SUBOP, 0, unsigned_immed16_overflow},
+  { "lmbd", prui_lmbd, "d,s,b",
+   OP_MATCH_LMBD, OP_MASK_FMT2_OP | OP_MASK_SUBOP, 0, unsigned_immed8_overflow},
   { "halt", prui_halt, "",
    OP_MATCH_HALT, OP_MASK_FMT2_OP | OP_MASK_SUBOP, 0, no_overflow},
   { "slp", prui_slp, "w",