commit 07c9ca3bd8e6f83bcec49c922b52422c538f60f7

Author: Andreas Arnez <arnez@linux.vnet.ibm.com>

Date:   Tue Jun 13 15:20:28 2017 +0200

    write_pieced_value: Fix buffer offset for memory pieces

    In write_pieced_value, when transferring the data to target memory via a

    buffer, the bit offset within the target value is not reduced to its

    sub-byte fraction before using it as a bit offset into the buffer.  This

    is fixed.

    gdb/ChangeLog:

            * dwarf2loc.c (write_pieced_value): In DWARF_VALUE_MEMORY,

            truncate full bytes from dest_offset_bits before using it as an

            offset into the buffer.

### a/gdb/ChangeLog

### b/gdb/ChangeLog

## -1,5 +1,11 @@

 2017-06-13  Andreas Arnez  <arnez@linux.vnet.ibm.com>

+	* dwarf2loc.c (write_pieced_value): In DWARF_VALUE_MEMORY,

+	truncate full bytes from dest_offset_bits before using it as an

+	offset into the buffer.

+

+2017-06-13  Andreas Arnez  <arnez@linux.vnet.ibm.com>

+

 	* dwarf2loc.c (write_pieced_value): Include transfer size in

 	byte-wise check.

--- a/gdb/dwarf2loc.c

+++ b/gdb/dwarf2loc.c

@@ -2058,7 +2058,7 @@ write_pieced_value (struct value *to, struct value *from)

 	      read_memory (p->v.mem.addr + dest_offset, buffer.data (), 1);

 	      read_memory (p->v.mem.addr + dest_offset + this_size - 1,

 			   &buffer[this_size - 1], 1);

-	      copy_bitwise (buffer.data (), dest_offset_bits,

+	      copy_bitwise (buffer.data (), dest_offset_bits % 8,

 			    contents, source_offset_bits,

 			    this_size_bits,

 			    bits_big_endian);