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, 13 insertions, 24 deletions

diff --git a/gdb/corelow.c b/gdb/corelow.c
index 578c910bb5..5dbabc79e6 100644
--- a/gdb/corelow.c
+++ b/gdb/corelow.c
@@ -668,25 +668,6 @@ add_to_spuid_list (bfd *abfd, asection *asect, void *list_p)
   list->pos += 4;
 }
 
-/* Read siginfo data from the core, if possible.  Returns -1 on
-   failure.  Otherwise, returns the number of bytes read.  ABFD is the
-   core file's BFD; READBUF, OFFSET, and LEN are all as specified by
-   the to_xfer_partial interface.  */
-
-static LONGEST
-get_core_siginfo (bfd *abfd, gdb_byte *readbuf, ULONGEST offset, ULONGEST len)
-{
-  thread_section_name section_name (".note.linuxcore.siginfo", inferior_ptid);
-  asection *section = bfd_get_section_by_name (abfd, section_name.c_str ());
-  if (section == NULL)
-    return -1;
-
-  if (!bfd_get_section_contents (abfd, section, readbuf, offset, len))
-    return -1;
-
-  return len;
-}
-
 static enum target_xfer_status
 core_xfer_partial (struct target_ops *ops, enum target_object object,
 		   const char *annex, gdb_byte *readbuf,
@@ -874,12 +855,20 @@ core_xfer_partial (struct target_ops *ops, enum target_object object,
     case TARGET_OBJECT_SIGNAL_INFO:
       if (readbuf)
 	{
-	  LONGEST l = get_core_siginfo (core_bfd, readbuf, offset, len);
-
-	  if (l > 0)
+	  if (core_gdbarch
+	      && gdbarch_core_xfer_siginfo_p (core_gdbarch))
 	    {
-	      *xfered_len = len;
-	      return TARGET_XFER_OK;
+	      LONGEST l = gdbarch_core_xfer_siginfo  (core_gdbarch, readbuf,
+						      offset, len);
+
+	      if (l >= 0)
+		{
+		  *xfered_len = l;
+		  if (l == 0)
+		    return TARGET_XFER_EOF;
+		  else
+		    return TARGET_XFER_OK;
+		}
 	    }
 	}
       return TARGET_XFER_E_IO;