[gdb_6_0-branch commit] PPC64: new call_dummy_address gdbarch method

[Jim Blandy <jimb@redhat.com>]

I've committed this to the 6.0 branch, with verbal approval on the
phone from Kevin Buettner, the PPC Linux maintainer.  It is already
committed to the trunk.

2003-06-06  Jim Blandy  <jimb@redhat.com>

	* ppc-linux-tdep.c (ppc64_call_dummy_address): New function.
	(ppc_linux_init_abi): Set it as the gdbarch's call_dummy_address
	method.

Index: gdb/ppc-linux-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/ppc-linux-tdep.c,v
retrieving revision 1.28.8.5
diff -c -r1.28.8.5 ppc-linux-tdep.c
*** gdb/ppc-linux-tdep.c	7 Jun 2003 00:06:05 -0000	1.28.8.5
--- gdb/ppc-linux-tdep.c	7 Jun 2003 00:15:33 -0000
***************
*** 893,898 ****
--- 893,910 ----
  }
  
  
+ /* On 64-bit PowerPC Linux, the ELF header's e_entry field is the
+    address of a function descriptor for the entry point function, not
+    the actual entry point itself.  So to find the actual address at
+    which execution should begin, we need to fetch the function's entry
+    point from that descriptor.  */
+ static CORE_ADDR
+ ppc64_call_dummy_address (void)
+ {
+   return ppc64_desc_entry_point (entry_point_address ());
+ }
+ 
+ 
  enum {
    ELF_NGREG = 48,
    ELF_NFPREG = 33,
***************
*** 1014,1019 ****
--- 1026,1033 ----
    
    if (tdep->wordsize == 8)
      {
+       set_gdbarch_call_dummy_address (gdbarch, ppc64_call_dummy_address);
+ 
        set_gdbarch_in_solib_call_trampoline
          (gdbarch, ppc64_in_solib_call_trampoline);
        set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);