Fix m68k-linux build

[Daniel Jacobowitz <dmj+ at andrew dot cmu dot edu>]

I don't have the hardware to test this, but by (exact) analogy with all the
other Linux ports, I'm pretty sure it's correct.  And yes, I intend to
eliminate all these copies of fetch_core_registers in one fell swoop some
day soon...

OK to commit this?

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

2001-07-11  Michael Fedrowitz  <michael.fedrowitz@informatik.uni-ulm.de>

	* config/m68k/linux.mh: Remove core-regset.o.
	* m68klinux-nat.c: Fix comment.
	(supply_gregset): Change argument to elf_gregset_t *.
	(supply_fpregset): Change argument to elf_fpregset_t *.
	(fetch_core_registers): New function.
	(linux_elf_core_fns): Define.
	(_initialize_m68k_linux_nat): New function.

diff -urN gdb-5.0.cvs20010704.orig/gdb/config/m68k/linux.mh gdb-5.0.cvs20010704/gdb/config/m68k/linux.mh
--- gdb-5.0.cvs20010704.orig/gdb/config/m68k/linux.mh	Mon Oct 30 23:33:32 2000
+++ gdb-5.0.cvs20010704/gdb/config/m68k/linux.mh	Tue Jul 10 22:32:13 2001
@@ -5,6 +5,6 @@
 
 NAT_FILE= nm-linux.h
 NATDEPFILES= infptrace.o inftarg.o fork-child.o \
-	corelow.o core-aout.o core-regset.o m68klinux-nat.o linux-thread.o
+	corelow.o core-aout.o m68klinux-nat.o linux-thread.o
 
 GDBSERVER_DEPFILES= low-linux.o
diff -urN gdb-5.0.cvs20010704.orig/gdb/m68klinux-nat.c gdb-5.0.cvs20010704/gdb/m68klinux-nat.c
--- gdb-5.0.cvs20010704.orig/gdb/m68klinux-nat.c	Tue Mar  6 09:21:09 2001
+++ gdb-5.0.cvs20010704/gdb/m68klinux-nat.c	Tue Jul 10 22:34:43 2001
@@ -66,9 +66,9 @@
   return (blockend + 4 * regmap[regnum]);
 }
 
-/*  Given a pointer to a general register set in /proc format (gregset_t *),
-   unpack the register contents and supply them as gdb's idea of the current
-   register values. */
+/*  Given a pointer to a general register set in /proc format
+   (elf_gregset_t *), unpack the register contents and supply
+   them as gdb's idea of the current register values. */
 
 
 /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
@@ -85,7 +85,7 @@
 #include "gregset.h"
 
 void
-supply_gregset (gregset_t *gregsetp)
+supply_gregset (elf_gregset_t *gregsetp)
 {
   int regi;
 
@@ -100,7 +100,7 @@
    idea of the current floating point register values. */
 
 void
-supply_fpregset (fpregset_t *fpregsetp)
+supply_fpregset (elf_fpregset_t *fpregsetp)
 {
   int regi;
 
@@ -112,6 +112,62 @@
 }
 
 #endif
+
+
+/* Interpreting register set info found in core files.  */
+
+/* Provide registers to GDB from a core file.
+
+   (We can't use the generic version of this function in
+   core-regset.c, because we need to use elf_gregset_t instead of
+   gregset_t.)
+
+   CORE_REG_SECT points to an array of bytes, which are the contents
+   of a `note' from a core file which BFD thinks might contain
+   register contents.  CORE_REG_SIZE is its size.
+
+   WHICH says which register set corelow suspects this is:
+     0 --- the general-purpose register set, in elf_gregset_t format
+     2 --- the floating-point register set, in elf_fpregset_t format
+
+   REG_ADDR isn't used on Linux.  */
+
+static void
+fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
+		      int which, CORE_ADDR reg_addr)
+{
+  elf_gregset_t gregset;
+  elf_fpregset_t fpregset;
+
+  switch (which)
+    {
+    case 0:
+      if (core_reg_size != sizeof (gregset))
+	warning ("Wrong size gregset in core file.");
+      else
+	{
+	  memcpy (&gregset, core_reg_sect, sizeof (gregset));
+	  supply_gregset (&gregset);
+	}
+      break;
+
+    case 2:
+      if (core_reg_size != sizeof (fpregset))
+	warning ("Wrong size fpregset in core file.");
+      else
+	{
+	  memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
+	  supply_fpregset (&fpregset);
+	}
+      break;
+
+    default:
+      /* We've covered all the kinds of registers we know about here,
+         so this must be something we wouldn't know what to do with
+         anyway.  Just ignore it.  */
+      break;
+    }
+}
 
 
 int
@@ -152,4 +208,22 @@
     return 1;
 
   return 0;
+}
+
+
+/* Register that we are able to handle Linux ELF core file formats.  */
+
+static struct core_fns linux_elf_core_fns =
+{
+  bfd_target_elf_flavour,		/* core_flavour */
+  default_check_format,			/* check_format */
+  default_core_sniffer,			/* core_sniffer */
+  fetch_core_registers,			/* core_read_registers */
+  NULL					/* next */
+};
+
+void
+_initialize_m68k_linux_nat ()
+{
+  add_core_fns (&linux_elf_core_fns);
 }