[PATCH] Cross target core debugging: host=i386, Target=PPC

[Martin Gadbois <martin.gadbois@colubris.com>]

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Here's the result of the mailing list posting http://sources.redhat.com/ml/gdb/2002-05/msg00191.html
applied for PPC.
Apply patch against GDB 5.2, and you'll be able to debug core dumps on a Intel host from a PowerPC
target.

The OS for both is Linux.

PS: Please reply to me directly, as I am not a member of this list.

- --
==============
Martin Gadbois
S/W Developper
Colubris Networks Inc.

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diff -Naur gdb-5.2/gdb/config/powerpc/linux.mt gdb-5.2-ppc-core/gdb/config/powerpc/linux.mt
--- gdb-5.2/gdb/config/powerpc/linux.mt	Fri Oct 19 20:16:44 2001
+++ gdb-5.2-ppc-core/gdb/config/powerpc/linux.mt	Mon Jul 29 16:25:49 2002
@@ -1,5 +1,5 @@
 # Target: Motorola PPC on Linux
-TDEPFILES= rs6000-tdep.o ppc-linux-tdep.o solib.o solib-svr4.o solib-legacy.o
+TDEPFILES= rs6000-tdep.o ppc-linux-tdep.o solib.o solib-svr4.o solib-legacy.o corelow.o core-regset.o
 TM_FILE= tm-linux.h
 
 SIM_OBS = remote-sim.o
diff -Naur gdb-5.2/gdb/core-regset.c gdb-5.2-ppc-core/gdb/core-regset.c
--- gdb-5.2/gdb/core-regset.c	Fri Aug  3 17:34:01 2001
+++ gdb-5.2-ppc-core/gdb/core-regset.c	Mon Jul 29 15:45:28 2002
@@ -35,13 +35,6 @@
  */
 
 #include "defs.h"
-
-#include <time.h>
-#ifdef HAVE_SYS_PROCFS_H
-#include <sys/procfs.h>
-#endif
-#include <fcntl.h>
-#include <errno.h>
 #include "gdb_string.h"
 
 #include "inferior.h"
diff -Naur gdb-5.2/gdb/gregset.h gdb-5.2-ppc-core/gdb/gregset.h
--- gdb-5.2/gdb/gregset.h	Sun Feb 24 17:14:33 2002
+++ gdb-5.2-ppc-core/gdb/gregset.h	Mon Jul 29 15:45:43 2002
@@ -21,6 +21,20 @@
 #ifndef GREGSET_H
 #define GREGSET_H
 
+
+#define ELF_NGREG	48	/* includes nip, msr, lr, etc. */
+#define ELF_NFPREG	33	/* includes fpscr */
+#define ELF_NVRREG	33	/* includes vscr */
+
+typedef unsigned long elf_greg_t;
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef double elf_fpreg_t;
+typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
+
+#define GDB_GREGSET_T elf_gregset_t
+#define GDB_FPREGSET_T elf_fpregset_t
+
 #ifndef GDB_GREGSET_T
 #define GDB_GREGSET_T gregset_t
 #endif
diff -Naur gdb-5.2/gdb/ppc-linux-tdep.c gdb-5.2-ppc-core/gdb/ppc-linux-tdep.c
--- gdb-5.2/gdb/ppc-linux-tdep.c	Sun Feb 24 17:31:19 2002
+++ gdb-5.2-ppc-core/gdb/ppc-linux-tdep.c	Mon Jul 29 14:59:24 2002
@@ -35,6 +35,7 @@
 #include "solib-svr4.h"
 #include "ppc-tdep.h"
 
+#include "gregset.h"
 /* The following two instructions are used in the signal trampoline
    code on GNU/Linux PPC.  */
 #define INSTR_LI_R0_0x7777	0x38007777
@@ -101,7 +102,61 @@
 #define PPC_LINUX_PT_FPR31 (PPC_LINUX_PT_FPR0 + 2*31)
 #define PPC_LINUX_PT_FPSCR (PPC_LINUX_PT_FPR0 + 2*32 + 1)
 
+#define FP0_REGNUM 32		/* FPR (Floating point) register 0 */
 static int ppc_linux_at_sigtramp_return_path (CORE_ADDR pc);
+
+#define SIZEOF_VRREGS 33*16+4
+typedef char gdb_vrregset_t[SIZEOF_VRREGS];
+
+
+static void
+supply_vrregset (gdb_vrregset_t *vrregsetp)
+{
+  int i;
+  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+  int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
+  int vrregsize = REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
+  int offset = vrregsize - REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
+
+  for (i = 0; i < num_of_vrregs; i++)
+    {
+      /* The last 2 registers of this set are only 32 bit long, not
+         128.  However an offset is necessary only for VSCR because it
+         occupies a whole vector, while VRSAVE occupies a full 4 bytes
+         slot.  */
+      if (i == (num_of_vrregs - 2))
+        supply_register (tdep->ppc_vr0_regnum + i,
+                         *vrregsetp + i * vrregsize + offset);
+      else
+        supply_register (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize);
+    }
+}
+void
+supply_gregset (gdb_gregset_t *gregsetp)
+{
+  int regi;
+  register elf_greg_t *regp = (elf_greg_t *) gregsetp;
+  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 
+
+  for (regi = 0; regi < 32; regi++)
+    supply_register (regi, (char *) (regp + regi));
+
+  supply_register (PC_REGNUM, (char *) (regp + PPC_LINUX_PT_NIP));
+  supply_register (tdep->ppc_lr_regnum, (char *) (regp + PPC_LINUX_PT_LNK));
+  supply_register (tdep->ppc_cr_regnum, (char *) (regp + PPC_LINUX_PT_CCR));
+  supply_register (tdep->ppc_xer_regnum, (char *) (regp + PPC_LINUX_PT_XER));
+  supply_register (tdep->ppc_ctr_regnum, (char *) (regp + PPC_LINUX_PT_CTR));
+  supply_register (tdep->ppc_mq_regnum, (char *) (regp + PPC_LINUX_PT_MQ));
+  supply_register (tdep->ppc_ps_regnum, (char *) (regp + PPC_LINUX_PT_MSR));
+}
+void
+supply_fpregset (gdb_fpregset_t * fpregsetp)
+{
+  int regi;
+
+  for (regi = 0; regi < 32; regi++)
+    supply_register (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
+}
 
 /* Determine if pc is in a signal trampoline...