2004-05-01 Andrew Cagney <cagney@redhat.com>

	* Makefile.in (m68klinux-nat.o): Update dependencies.
	* m68klinux-tdep.c: Include "trad-frame.h" and "frame-unwind.h".
	(m68k_linux_sigtramp_frame_cache)
	(m68k_linux_sigtramp_frame_this_id)
	(m68k_linux_sigtramp_frame_prev_register)
	(m68k_linux_sigtramp_frame_unwind)
	(m68k_linux_sigtramp_frame_sniffer)
	(struct m68k_linux_sigtramp_info, m68k_linux_init_abi): Code from
	m68k-tdep.h and m68k-tdep.c, add "linux" to function and variable
	names, use trad-frame.h.
	* m68k-tdep.h (struct gdbarch_tdep): Delete get_sigtramp_info.
	(struct m68k_sigtramp_info): Delete.
	* m68k-tdep.c (m68k_sigtramp_frame_cache)
	(m68k_sigtramp_frame_this_id, m68k_sigtramp_frame_prev_register)
	(m68k_sigtramp_frame_unwind, m68k_sigtramp_frame_sniffer)
	(m68k_gdbarch_init): Delete all the sigtramp code, moved to
	"m68klinux-tdep.c".

1 files changed, 98 insertions, 4 deletions

diff --git a/gdb/m68klinux-tdep.c b/gdb/m68klinux-tdep.c
index 1091951..c174daa 100644
--- a/gdb/m68klinux-tdep.c
+++ b/gdb/m68klinux-tdep.c
@@ -33,6 +33,8 @@
 #include "objfiles.h"
 #include "symtab.h"
 #include "m68k-tdep.h"
+#include "trad-frame.h"
+#include "frame-unwind.h"
 
 /* Offsets (in target ints) into jmp_buf.  */
 
@@ -160,12 +162,21 @@ static int m68k_linux_ucontext_reg_offset[M68K_NUM_REGS] =
 
 /* Get info about saved registers in sigtramp.  */
 
-static struct m68k_sigtramp_info
+struct m68k_linux_sigtramp_info
+{
+  /* Address of sigcontext.  */
+  CORE_ADDR sigcontext_addr;
+
+  /* Offset of registers in `struct sigcontext'.  */
+  int *sc_reg_offset;
+};
+
+static struct m68k_linux_sigtramp_info
 m68k_linux_get_sigtramp_info (struct frame_info *next_frame)
 {
   CORE_ADDR sp;
   char buf[4];
-  struct m68k_sigtramp_info info;
+  struct m68k_linux_sigtramp_info info;
 
   frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
   sp = extract_unsigned_integer (buf, 4);
@@ -180,6 +191,90 @@ m68k_linux_get_sigtramp_info (struct frame_info *next_frame)
   return info;
 }
 
+/* Signal trampolines.  */
+
+static struct trad_frame_cache *
+m68k_linux_sigtramp_frame_cache (struct frame_info *next_frame,
+				 void **this_cache)
+{
+  struct frame_id this_id;
+  struct trad_frame_cache *cache;
+  struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+  struct m68k_linux_sigtramp_info info;
+  char buf[4];
+  int i;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = trad_frame_cache_zalloc (next_frame);
+
+  /* FIXME: cagney/2004-05-01: This is is long standing broken code.
+     The frame ID's code address should be the start-address of the
+     signal trampoline and not the current PC within that
+     trampoline.  */
+  frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
+  /* See the end of m68k_push_dummy_call.  */
+  this_id = frame_id_build (extract_unsigned_integer (buf, 4) - 4 + 8,
+			    frame_pc_unwind (next_frame));
+  trad_frame_set_id (cache, this_id);
+
+  info = m68k_linux_get_sigtramp_info (next_frame);
+
+  for (i = 0; i < M68K_NUM_REGS; i++)
+    if (info.sc_reg_offset[i] != -1)
+      trad_frame_set_reg_addr (cache, i,
+			       info.sigcontext_addr + info.sc_reg_offset[i]);
+
+  *this_cache = cache;
+  return cache;
+}
+
+static void
+m68k_linux_sigtramp_frame_this_id (struct frame_info *next_frame,
+				   void **this_cache,
+				   struct frame_id *this_id)
+{
+  struct trad_frame_cache *cache =
+    m68k_linux_sigtramp_frame_cache (next_frame, this_cache);
+  trad_frame_get_id (cache, this_id);
+}
+
+static void
+m68k_linux_sigtramp_frame_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)
+{
+  /* Make sure we've initialized the cache.  */
+  struct trad_frame_cache *cache =
+    m68k_linux_sigtramp_frame_cache (next_frame, this_cache);
+  trad_frame_get_register (cache, next_frame, regnum, optimizedp, lvalp,
+			   addrp, realnump, valuep);
+}
+
+static const struct frame_unwind m68k_linux_sigtramp_frame_unwind =
+{
+  SIGTRAMP_FRAME,
+  m68k_linux_sigtramp_frame_this_id,
+  m68k_linux_sigtramp_frame_prev_register
+};
+
+static const struct frame_unwind *
+m68k_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  char *name;
+
+  find_pc_partial_function (pc, &name, NULL, NULL);
+  if (m68k_linux_pc_in_sigtramp (pc, name))
+    return &m68k_linux_sigtramp_frame_unwind;
+
+  return NULL;
+}
+
 /* Extract from an array REGBUF containing the (raw) register state, a
    function return value of TYPE, and copy that, in virtual format,
    into VALBUF.  */
@@ -289,14 +384,13 @@ m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   tdep->jb_pc = M68K_LINUX_JB_PC;
   tdep->jb_elt_size = M68K_LINUX_JB_ELEMENT_SIZE;
-  tdep->get_sigtramp_info = m68k_linux_get_sigtramp_info;
   tdep->struct_return = reg_struct_return;
 
   set_gdbarch_extract_return_value (gdbarch, m68k_linux_extract_return_value);
   set_gdbarch_store_return_value (gdbarch, m68k_linux_store_return_value);
   set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68k_linux_extract_struct_value_address);
 
-  set_gdbarch_deprecated_pc_in_sigtramp (gdbarch, m68k_linux_pc_in_sigtramp);
+  frame_unwind_append_sniffer (gdbarch, m68k_linux_sigtramp_frame_sniffer);
 
   /* Shared library handling.  */
   set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);