* gdbarch.sh (gdbarch_unwind_pc): New method.
* gdbarch.h, gdbarch.c: Regenerate.
* frame.c (frame_pc_unwind): Rewrite. Prefer gdbarch_unwind_pc,
but use read_pc and FRAME_SAVED_PC as fall backs.
(frame_saved_regs_pc_unwind): Delete function.
(trad_frame_unwinder): Update.
* frame-unwind.h (frame_unwind_pc_ftype): Delete declaration.
(struct frame_unwind): Update.
* dummy-frame.c (dummy_frame_pc_unwind): Delete function.
(dummy_frame_unwind): Update.
* sentinel-frame.c (sentinel_frame_pc_unwind): Delete function.
(sentinel_frame_unwinder): Update.
* d10v-tdep.c (d10v_frame_pc_unwind): Delete function.
(d10v_frame_unwind): Update.
(d10v_unwind_pc): New function.
(d10v_gdbarch_init): Set unwind_pc.
Index: doc/ChangeLog
2003-03-10 Andrew Cagney <cagney@redhat.com>
* gdbint.texinfo (Target Architecture Definition): Cross reference
FRAME_SAVED_PC to unwind_pc. Document unwind_pc.
+2003-03-10 Andrew Cagney <cagney@redhat.com>
+
+ * gdbarch.sh (gdbarch_unwind_pc): New method.
+ * gdbarch.h, gdbarch.c: Regenerate.
+ * frame.c (frame_pc_unwind): Rewrite. Prefer gdbarch_unwind_pc,
+ but use read_pc and FRAME_SAVED_PC as fall backs.
+ (frame_saved_regs_pc_unwind): Delete function.
+ (trad_frame_unwinder): Update.
+ * frame-unwind.h (frame_unwind_pc_ftype): Delete declaration.
+ (struct frame_unwind): Update.
+ * dummy-frame.c (dummy_frame_pc_unwind): Delete function.
+ (dummy_frame_unwind): Update.
+ * sentinel-frame.c (sentinel_frame_pc_unwind): Delete function.
+ (sentinel_frame_unwinder): Update.
+ * d10v-tdep.c (d10v_frame_pc_unwind): Delete function.
+ (d10v_frame_unwind): Update.
+ (d10v_unwind_pc): New function.
+ (d10v_gdbarch_init): Set unwind_pc.
+
2003-03-10 Andrew Cagney <cagney@redhat.com>
* gdbarch.h: Re-generate.
}
}
-
static CORE_ADDR
-d10v_frame_pc_unwind (struct frame_info *frame,
- void **cache)
+d10v_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- struct d10v_unwind_cache *info = d10v_frame_unwind_cache (frame, cache);
- return info->return_pc;
+ ULONGEST pc;
+ frame_unwind_unsigned_register (next_frame, PC_REGNUM, &pc);
+ return d10v_make_iaddr (pc);
}
/* Given a GDB frame, determine the address of the calling function's
static struct frame_unwind d10v_frame_unwind = {
d10v_frame_pop,
- d10v_frame_pc_unwind,
d10v_frame_id_unwind,
d10v_frame_register_unwind
};
set_gdbarch_unwind_dummy_id (gdbarch, d10v_unwind_dummy_id);
set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
+ /* Return the unwound PC value. */
+ set_gdbarch_unwind_pc (gdbarch, d10v_unwind_pc);
+
return gdbarch;
}
+2003-03-10 Andrew Cagney <cagney@redhat.com>
+
+ * gdbint.texinfo (Target Architecture Definition): Cross reference
+ FRAME_SAVED_PC to unwind_pc. Document unwind_pc.
+
2003-03-07 Andrew Cagney <cagney@redhat.com>
* gdb.texinfo (Debugging Output): Mention the "set/show debug
@item FRAME_SAVED_PC(@var{frame})
@findex FRAME_SAVED_PC
-Given @var{frame}, return the pc saved there. This is the return
-address.
+@anchor{FRAME_SAVED_PC} Given @var{frame}, return the pc saved there.
+This is the return address.
+
+This method is deprecated. @xref{unwind_pc}.
+
+@item CORE_ADDR unwind_pc (struct frame_info *@var{this_frame})
+@findex unwind_pc
+@anchor{unwind_pc} Return the instruction address, in @var{this_frame}'s
+caller, at which execution will resume after @var{this_frame} returns.
+This is commonly refered to as the return address.
+
+The implementation, which must be frame agnostic (work with any frame),
+is typically no more than:
+
+@smallexample
+ULONGEST pc;
+frame_unwind_unsigned_register (this_frame, D10V_PC_REGNUM, &pc);
+return d10v_make_iaddr (pc);
+@end smallexample
+
+@noindent
+@xref{FRAME_SAVED_PC}, which this method replaces.
@item FUNCTION_EPILOGUE_SIZE
@findex FUNCTION_EPILOGUE_SIZE
}
}
-/* Assuming that FRAME is a dummy, return the resume address for the
- previous frame. */
-
-static CORE_ADDR
-dummy_frame_pc_unwind (struct frame_info *frame,
- void **cache)
-{
- struct dummy_frame *dummy = cached_find_dummy_frame (frame, cache);
- /* Oops! In a dummy-frame but can't find the stack dummy. Pretend
- that the frame doesn't unwind. Should this function instead
- return a has-no-caller indication? */
- if (dummy == NULL)
- return 0;
- return dummy->pc;
-}
-
-
/* Assuming that FRAME is a dummy, return the ID of the calling frame
(the frame that the dummy has the saved state of). */
static struct frame_unwind dummy_frame_unwind =
{
dummy_frame_pop,
- dummy_frame_pc_unwind,
dummy_frame_id_unwind,
dummy_frame_register_unwind
};
CORE_ADDR *addrp,
int *realnump, void *valuep);
-/* Same as for registers above, but return the address at which the
- calling frame would resume. */
-
-typedef CORE_ADDR (frame_unwind_pc_ftype) (struct frame_info * frame,
- void **unwind_cache);
-
/* Same as for registers above, but return the ID of the frame that
called this one. */
/* Should an attribute indicating the frame's address-in-block go
here? */
frame_unwind_pop_ftype *pop;
- frame_unwind_pc_ftype *pc;
frame_unwind_id_ftype *id;
frame_unwind_reg_ftype *reg;
};
}
CORE_ADDR
-frame_pc_unwind (struct frame_info *frame)
+frame_pc_unwind (struct frame_info *this_frame)
{
- if (!frame->pc_unwind_cache_p)
+ if (!this_frame->pc_unwind_cache_p)
{
- frame->pc_unwind_cache = frame->unwind->pc (frame, &frame->unwind_cache);
- frame->pc_unwind_cache_p = 1;
+ CORE_ADDR pc;
+ if (gdbarch_unwind_pc_p (current_gdbarch))
+ {
+ /* The right way. The `pure' way. The one true way. This
+ method depends solely on the register-unwind code to
+ determine the value of registers in THIS frame, and hence
+ the value of this frame's PC (resume address). A typical
+ implementation is no more than:
+
+ frame_unwind_register (this_frame, ISA_PC_REGNUM, buf);
+ return extract_address (buf, size of ISA_PC_REGNUM);
+
+ Note: this method is very heavily dependent on a correct
+ register-unwind implementation, it pays to fix that
+ method first; this method is frame type agnostic, since
+ it only deals with register values, it works with any
+ frame. This is all in stark contrast to the old
+ FRAME_SAVED_PC which would try to directly handle all the
+ different ways that a PC could be unwound. */
+ pc = gdbarch_unwind_pc (current_gdbarch, this_frame);
+ }
+ else if (this_frame->level < 0)
+ {
+ /* FIXME: cagney/2003-03-06: Old code and and a sentinel
+ frame. Do like was always done. Fetch the PC's value
+ direct from the global registers array (via read_pc).
+ This assumes that this frame belongs to the current
+ global register cache. The assumption is dangerous. */
+ pc = read_pc ();
+ }
+ else if (FRAME_SAVED_PC_P ())
+ {
+ /* FIXME: cagney/2003-03-06: Old code, but not a sentinel
+ frame. Do like was always done. Note that this method,
+ unlike unwind_pc(), tries to handle all the different
+ frame cases directly. It fails. */
+ pc = FRAME_SAVED_PC (this_frame);
+ }
+ else
+ internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method");
+ this_frame->pc_unwind_cache = pc;
+ this_frame->pc_unwind_cache_p = 1;
}
- return frame->pc_unwind_cache;
+ return this_frame->pc_unwind_cache;
}
void
bufferp);
}
-static CORE_ADDR
-frame_saved_regs_pc_unwind (struct frame_info *frame, void **cache)
-{
- gdb_assert (FRAME_SAVED_PC_P ());
- return FRAME_SAVED_PC (frame);
-}
-
static void
frame_saved_regs_id_unwind (struct frame_info *next_frame, void **cache,
struct frame_id *id)
const struct frame_unwind trad_frame_unwinder = {
frame_saved_regs_pop,
- frame_saved_regs_pc_unwind,
frame_saved_regs_id_unwind,
frame_saved_regs_register_unwind
};
gdbarch_frame_chain_ftype *frame_chain;
gdbarch_frame_chain_valid_ftype *frame_chain_valid;
gdbarch_frame_saved_pc_ftype *frame_saved_pc;
+ gdbarch_unwind_pc_ftype *unwind_pc;
gdbarch_frame_args_address_ftype *frame_args_address;
gdbarch_frame_locals_address_ftype *frame_locals_address;
gdbarch_saved_pc_after_call_ftype *saved_pc_after_call;
0,
0,
0,
+ 0,
generic_in_function_epilogue_p,
construct_inferior_arguments,
0,
/* Skip verify of frame_chain, has predicate */
/* Skip verify of frame_chain_valid, has predicate */
/* Skip verify of frame_saved_pc, has predicate */
+ /* Skip verify of unwind_pc, has predicate */
/* Skip verify of frame_args_address, invalid_p == 0 */
/* Skip verify of frame_locals_address, invalid_p == 0 */
if ((GDB_MULTI_ARCH > GDB_MULTI_ARCH_PARTIAL)
fprintf_unfiltered (file,
"gdbarch_dump: unwind_dummy_id = 0x%08lx\n",
(long) current_gdbarch->unwind_dummy_id);
+ if (GDB_MULTI_ARCH)
+ fprintf_unfiltered (file,
+ "gdbarch_dump: gdbarch_unwind_pc_p() = %d\n",
+ gdbarch_unwind_pc_p (current_gdbarch));
+ if (GDB_MULTI_ARCH)
+ fprintf_unfiltered (file,
+ "gdbarch_dump: unwind_pc = 0x%08lx\n",
+ (long) current_gdbarch->unwind_pc);
#ifdef USE_STRUCT_CONVENTION
fprintf_unfiltered (file,
"gdbarch_dump: %s # %s\n",
gdbarch->frame_saved_pc = frame_saved_pc;
}
+int
+gdbarch_unwind_pc_p (struct gdbarch *gdbarch)
+{
+ gdb_assert (gdbarch != NULL);
+ return gdbarch->unwind_pc != 0;
+}
+
+CORE_ADDR
+gdbarch_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ gdb_assert (gdbarch != NULL);
+ if (gdbarch->unwind_pc == 0)
+ internal_error (__FILE__, __LINE__,
+ "gdbarch: gdbarch_unwind_pc invalid");
+ if (gdbarch_debug >= 2)
+ fprintf_unfiltered (gdb_stdlog, "gdbarch_unwind_pc called\n");
+ return gdbarch->unwind_pc (gdbarch, next_frame);
+}
+
+void
+set_gdbarch_unwind_pc (struct gdbarch *gdbarch,
+ gdbarch_unwind_pc_ftype unwind_pc)
+{
+ gdbarch->unwind_pc = unwind_pc;
+}
+
CORE_ADDR
gdbarch_frame_args_address (struct gdbarch *gdbarch, struct frame_info *fi)
{
#endif
#endif
+/* NOTE: FRAME_SAVED_PC is replaced by UNWIND_PC */
+
#if defined (FRAME_SAVED_PC)
/* Legacy for systems yet to multi-arch FRAME_SAVED_PC */
#if !defined (FRAME_SAVED_PC_P)
#endif
#endif
+extern int gdbarch_unwind_pc_p (struct gdbarch *gdbarch);
+
+typedef CORE_ADDR (gdbarch_unwind_pc_ftype) (struct gdbarch *gdbarch, struct frame_info *next_frame);
+extern CORE_ADDR gdbarch_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame);
+extern void set_gdbarch_unwind_pc (struct gdbarch *gdbarch, gdbarch_unwind_pc_ftype *unwind_pc);
+
/* Default (function) for non- multi-arch platforms. */
#if (!GDB_MULTI_ARCH) && !defined (FRAME_ARGS_ADDRESS)
#define FRAME_ARGS_ADDRESS(fi) (get_frame_base (fi))
f:2:FRAMELESS_FUNCTION_INVOCATION:int:frameless_function_invocation:struct frame_info *fi:fi:::generic_frameless_function_invocation_not::0
F:2:FRAME_CHAIN:CORE_ADDR:frame_chain:struct frame_info *frame:frame::0:0
F:2:FRAME_CHAIN_VALID:int:frame_chain_valid:CORE_ADDR chain, struct frame_info *thisframe:chain, thisframe::0:0
+# NOTE: FRAME_SAVED_PC is replaced by UNWIND_PC
F:2:FRAME_SAVED_PC:CORE_ADDR:frame_saved_pc:struct frame_info *fi:fi::0:0
+M::UNWIND_PC:CORE_ADDR:unwind_pc:struct frame_info *next_frame:next_frame:
f:2:FRAME_ARGS_ADDRESS:CORE_ADDR:frame_args_address:struct frame_info *fi:fi::0:get_frame_base::0
f:2:FRAME_LOCALS_ADDRESS:CORE_ADDR:frame_locals_address:struct frame_info *fi:fi::0:get_frame_base::0
f:2:SAVED_PC_AFTER_CALL:CORE_ADDR:saved_pc_after_call:struct frame_info *frame:frame::0:0
}
}
-CORE_ADDR
-sentinel_frame_pc_unwind (struct frame_info *frame,
- void **cache)
-{
- /* FIXME: cagney/2003-01-08: This should be using a per-architecture
- method that doesn't suffer from DECR_PC_AFTER_BREAK problems.
- Such a method would take unwind_cache, regcache and stop reason
- parameters. */
- return read_pc ();
-}
-
void
sentinel_frame_id_unwind (struct frame_info *frame,
void **cache,
const struct frame_unwind sentinel_frame_unwinder =
{
sentinel_frame_pop,
- sentinel_frame_pc_unwind,
sentinel_frame_id_unwind,
sentinel_frame_register_unwind
};
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