Add a new gdbarch method to fetch signal information from core files.

Previously the core_xfer_partial method used core_get_siginfo to handle
TARGET_OBJECT_SIGNAL_INFO requests.  However, core_get_siginfo looked for
Linux-specific sections in the core file.  To support fetching siginfo
from cores on other systems, add a new gdbarch method (`core_xfer_siginfo`)
and move the body of the existing core_get_siginfo into a
linux_core_xfer_siginfo implementation of this method in linux-tdep.c.

gdb/ChangeLog:

	* corelow.c (get_core_siginfo): Remove.
	(core_xfer_partial): Use the gdbarch "core_xfer_siginfo" method
	instead of get_core_siginfo.
	* gdbarch.sh (core_xfer_siginfo): New gdbarch callback.
	* gdbarch.h: Re-generate.
	* gdbarch.c: Re-generate.
	* linux-tdep.c (linux_core_xfer_siginfo): New.
	(linux_init_abi): Install gdbarch "core_xfer_siginfo" method.

1 files changed, 5 insertions, 0 deletions

diff --git a/gdb/gdbarch.sh b/gdb/gdbarch.sh
index 22f5715037..3aab17f958 100755
--- a/gdb/gdbarch.sh
+++ b/gdb/gdbarch.sh
@@ -755,6 +755,11 @@ M;const char *;core_pid_to_str;ptid_t ptid;ptid
 # How the core target extracts the name of a thread from a core file.
 M;const char *;core_thread_name;struct thread_info *thr;thr
 
+# Read offset OFFSET of TARGET_OBJECT_SIGNAL_INFO signal information
+# from core file into buffer READBUF with length LEN.  Return the number
+# of bytes read (zero indicates EOF, a negative value indicates failure).
+M;LONGEST;core_xfer_siginfo;gdb_byte *readbuf, ULONGEST offset, ULONGEST len; readbuf, offset, len
+
 # BFD target to use when generating a core file.
 V;const char *;gcore_bfd_target;;;0;0;;;pstring (gdbarch->gcore_bfd_target)