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gdb/rs6000: Read backchain as unsigned.

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Previously, backchain was read as a signed quantity, resulting in
addresses like 0xfffffffffffeded0 instead of 0xfffeded0 returned by
unwinder on 32-bit powerpc.  While normally such addresses are masked
off, this causes problems for tracepoints, since 0xfffffffffffeded0
is considered unavailable.

Fixes a test failure in gdb.trace/entry-values.exp.

gdb/ChangeLog:

	* corefile.c (safe_read_memory_unsigned_integer): New function.
	* gdbcore.h (safe_read_memory_unsigned_integer): New prototype.
	* rs6000-tdep.c (rs6000_frame_cache): Read backchain as unsigned.
This commit is contained in:
Marcin Kościelnicki 2016-03-06 16:38:52 +01:00
parent a67914defb
commit cc2c4da881
4 changed files with 30 additions and 3 deletions
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3
gdb/gdbcore.h
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@ -76,6 +76,9 @@ extern int safe_read_memory_integer (CORE_ADDR memaddr, int len,
extern ULONGEST read_memory_unsigned_integer (CORE_ADDR memaddr,
int len,
enum bfd_endian byte_order);
extern int safe_read_memory_unsigned_integer (CORE_ADDR memaddr, int len,
enum bfd_endian byte_order,
ULONGEST *return_value);
/* Read an integer from debugged code memory, given address,
number of bytes, and byte order for code. */