kgdb support for gdb: patch 1

["Amit S. Kale" <amitkale@linsyssoft.com>]

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Hi,

I have been working on the changes suggested by Mark K and Andrew C. Here is 
the first patch. This adds support for a new osabi for linux kernel.

I haven't added any support for detecting kernel osabi automatically. 
Detecting it with present kernel binary structure is rather shaky. It's safer 
to let users run the command "set osabi Linux-kernel".

I'll be later sending more patches.

Please review it and let me know if it's ok for inclusion in gdb.
Thanks.
-Amit

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Index: gdb/gdb/i386-linux-tdep.c
===================================================================
--- gdb.orig/gdb/i386-linux-tdep.c	2004-08-07 02:28:28.000000000 +0530
+++ gdb/gdb/i386-linux-tdep.c	2004-10-21 18:18:18.000000000 +0530
@@ -27,6 +27,7 @@
 #include "inferior.h"
 #include "osabi.h"
 #include "reggroups.h"
+#include "elf-bfd.h"
 
 #include "gdb_string.h"
 
@@ -416,6 +417,26 @@
   set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
 }
 
+static void
+i386_linuxkernel_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Linux Kernel uses ELF format for vmlinux file.  */
+  i386_elf_init_abi (info, gdbarch);
+
+  set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS);
+  set_gdbarch_register_name (gdbarch, i386_linux_register_name);
+  set_gdbarch_register_reggroup_p (gdbarch, i386_linux_register_reggroup_p);
+
+  tdep->gregset_reg_offset = i386_linux_gregset_reg_offset;
+  tdep->gregset_num_regs = ARRAY_SIZE (i386_linux_gregset_reg_offset);
+  tdep->sizeof_gregset = 17 * 4;
+
+  tdep->jb_pc_offset = 20;	/* From <bits/setjmp.h>.  */
+
+}
+
 /* Provide a prototype to silence -Wmissing-prototypes.  */
 extern void _initialize_i386_linux_tdep (void);
 
@@ -424,4 +445,6 @@
 {
   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX,
 			  i386_linux_init_abi);
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUXKERNEL,
+			  i386_linuxkernel_init_abi);
 }
Index: gdb/gdb/defs.h
===================================================================
--- gdb.orig/gdb/defs.h	2004-10-12 15:36:14.000000000 +0530
+++ gdb/gdb/defs.h	2004-10-21 18:14:02.000000000 +0530
@@ -1031,6 +1031,7 @@
   GDB_OSABI_SOLARIS,
   GDB_OSABI_OSF1,
   GDB_OSABI_LINUX,
+  GDB_OSABI_LINUX_KERNEL,
   GDB_OSABI_FREEBSD_AOUT,
   GDB_OSABI_FREEBSD_ELF,
   GDB_OSABI_NETBSD_AOUT,
Index: gdb/gdb/osabi.c
===================================================================
--- gdb.orig/gdb/osabi.c	2004-07-03 02:57:17.000000000 +0530
+++ gdb/gdb/osabi.c	2004-10-21 18:14:02.000000000 +0530
@@ -57,6 +57,7 @@
   "Solaris",
   "OSF/1",
   "GNU/Linux",
+  "Linux-kernel",
   "FreeBSD a.out",
   "FreeBSD ELF",
   "NetBSD a.out",