Make unwinding through kernel trap frames work on sparc64.

4 files changed, 112 insertions, 8 deletions

diff --git a/gnu/usr.bin/binutils/gdb/Makefile.in b/gnu/usr.bin/binutils/gdb/Makefile.in
index 9edfd6f745b..abcaf2f7e09 100644
--- a/gnu/usr.bin/binutils/gdb/Makefile.in
+++ b/gnu/usr.bin/binutils/gdb/Makefile.in
@@ -2537,8 +2537,8 @@ sparc64-linux-tdep.o: sparc64-linux-tdep.c $(defs_h) $(gdbarch_h) $(osabi_h) \
 	$(sparc64_tdep_h)
 sparc64-nat.o: sparc64-nat.c $(defs_h) $(gdbarch_h) $(sparc64_tdep_h) \
 	$(sparc_nat_h)
-sparc64nbsd-nat.o: sparc64nbsd-nat.c $(defs_h) $(regcache_h) $(target_h) \
-	$(sparc64_tdep_h) $(sparc_nat_h) $(bsd_kvm_h)
+sparc64nbsd-nat.o: sparc64nbsd-nat.c $(defs_h) $(gdbcore_h) $(regcache_h) \
+	$(target_h) $(sparc64_tdep_h) $(sparc_nat_h) $(bsd_kvm_h)
 sparc64nbsd-tdep.o: sparc64nbsd-tdep.c $(defs_h) $(frame_h) \
 	$(frame_unwind_h) $(gdbcore_h) $(osabi_h) $(regcache_h) $(regset_h) \
 	$(symtab_h) $(objfiles_h) $(solib_svr4_h) $(trad_frame_h) \
diff --git a/gnu/usr.bin/binutils/gdb/sparc64-tdep.h b/gnu/usr.bin/binutils/gdb/sparc64-tdep.h
index c3073b90b3a..f98703efe78 100644
--- a/gnu/usr.bin/binutils/gdb/sparc64-tdep.h
+++ b/gnu/usr.bin/binutils/gdb/sparc64-tdep.h
@@ -1,6 +1,6 @@
 /* Target-dependent code for UltraSPARC.
 
-   Copyright 2003, 2004 Free Software Foundation, Inc.
+   Copyright 2003, 2004, 2006 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -84,6 +84,18 @@ enum sparc64_regnum
   = SPARC64_Q0_REGNUM + 15
 };
 
+/* Processor state bits.  */
+#define SPARC64_PSTATE_AG	0x001
+#define SPARC64_PSTATE_IE	0x002
+#define SPARC64_PSTATE_PRIV	0x004
+#define SPARC64_PSTATE_AM	0x008
+#define SPARC64_PSTATE_PEF	0x010
+#define SPARC64_PSTATE_RED	0x020
+#define SPARC64_PSTATE_TLE	0x100
+#define SPARC64_PSTATE_CLE	0x200
+#define SPARC64_PSTATE_PID0	0x400
+#define SPARC64_PSTATE_PID1	0x800
+
 extern void sparc64_init_abi (struct gdbarch_info info,
 			      struct gdbarch *gdbarch);
 
diff --git a/gnu/usr.bin/binutils/gdb/sparc64nbsd-nat.c b/gnu/usr.bin/binutils/gdb/sparc64nbsd-nat.c
index fe9e006b8dc..fbeb5d5768f 100644
--- a/gnu/usr.bin/binutils/gdb/sparc64nbsd-nat.c
+++ b/gnu/usr.bin/binutils/gdb/sparc64nbsd-nat.c
@@ -1,6 +1,6 @@
 /* Native-dependent code for NetBSD/sparc64.
 
-   Copyright 2003, 2004 Free Software Foundation, Inc.
+   Copyright 2003, 2004, 2006 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -20,6 +20,7 @@
    Boston, MA 02111-1307, USA.  */
 
 #include "defs.h"
+#include "gdbcore.h"
 #include "regcache.h"
 #include "target.h"
 
@@ -136,21 +137,31 @@ sparc64nbsd_fpregset_supplies_p (int regnum)
 static int
 sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 {
+  u_int64_t state;
   int regnum;
 
   /* The following is true for NetBSD 1.6.2:
 
-     The pcb contains %sp and %pc, %psr and %wim.  From this information
-     we reconstruct the register state as it would look when we just
-     returned from cpu_switch().  */
+     The pcb contains %sp and %pc, %pstate and %cwp.  From this
+     information we reconstruct the register state as it would look
+     when we just returned from cpu_switch().  */
 
   /* The stack pointer shouldn't be zero.  */
   if (pcb->pcb_sp == 0)
     return 0;
 
+  /* If the program counter is zero, this is probably a core dump, and
+     we can get %pc from the stack.  */
+  if (pcb->pcb_pc == 0)
+      read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8), 
+		  (char *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
+
   regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
   regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
 
+  state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
+  regcache_raw_supply (regcache, SPARC64_STATE_REGNUM, &state);
+
   sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
 
   return 1;
diff --git a/gnu/usr.bin/binutils/gdb/sparc64obsd-tdep.c b/gnu/usr.bin/binutils/gdb/sparc64obsd-tdep.c
index b10c2706fef..eb3e66fb965 100644
--- a/gnu/usr.bin/binutils/gdb/sparc64obsd-tdep.c
+++ b/gnu/usr.bin/binutils/gdb/sparc64obsd-tdep.c
@@ -1,6 +1,6 @@
 /* Target-dependent code for OpenBSD/sparc64.
 
-   Copyright 2004, 2005 Free Software Foundation, Inc.
+   Copyright 2004, 2005, 2006 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -189,6 +189,86 @@ sparc64obsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
   return NULL;
 }
 
+/* Kernel debugging support.  */
+
+static struct sparc_frame_cache *
+sparc64obsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
+{
+  struct sparc_frame_cache *cache;
+  CORE_ADDR sp, trapframe_addr;
+  int regnum;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = sparc_frame_cache (next_frame, this_cache);
+  gdb_assert (cache == *this_cache);
+
+  sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
+  trapframe_addr = sp + BIAS + 176;
+
+  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+  cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
+  cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
+  cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;
+
+  for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
+    cache->saved_regs[regnum].addr =
+      trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;
+
+  return cache;
+}
+
+static void
+sparc64obsd_trapframe_this_id (struct frame_info *next_frame,
+			       void **this_cache, struct frame_id *this_id)
+{
+  struct sparc_frame_cache *cache =
+    sparc64obsd_trapframe_cache (next_frame, this_cache);
+
+  (*this_id) = frame_id_build (cache->base, cache->pc);
+}
+
+static void
+sparc64obsd_trapframe_prev_register (struct frame_info *next_frame,
+				     void **this_cache,
+				     int regnum, int *optimizedp,
+				     enum lval_type *lvalp, CORE_ADDR *addrp,
+				     int *realnump, void *valuep)
+{
+  struct sparc_frame_cache *cache =
+    sparc64obsd_trapframe_cache (next_frame, this_cache);
+
+  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
+				optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind sparc64obsd_trapframe_unwind =
+{
+  NORMAL_FRAME,
+  sparc64obsd_trapframe_this_id,
+  sparc64obsd_trapframe_prev_register
+};
+
+static const struct frame_unwind *
+sparc64obsd_trapframe_sniffer (struct frame_info *next_frame)
+{
+  ULONGEST pstate;
+  char *name;
+
+  /* Check whether we are in privileged mode, and bail out if we're not.  */
+  pstate = frame_unwind_register_unsigned (next_frame, SPARC64_PSTATE_REGNUM);
+  if ((pstate & SPARC64_PSTATE_PRIV) == 0)
+    return NULL;
+
+  find_pc_partial_function (frame_pc_unwind (next_frame), &name, NULL, NULL);
+  if (name && strcmp (name, "Lslowtrap_reenter") == 0)
+    return &sparc64obsd_trapframe_unwind;
+
+  return NULL;
+}
+
 
 static void
 sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
@@ -199,6 +279,7 @@ sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->sizeof_gregset = 832;
 
   frame_unwind_append_sniffer (gdbarch, sparc64obsd_sigtramp_frame_sniffer);
+  frame_unwind_append_sniffer (gdbarch, sparc64obsd_trapframe_sniffer);
 
   sparc64_init_abi (info, gdbarch);