/* Code dealing with dummy stack frames, for GDB, the GNU debugger.
- Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
- Software Foundation, Inc.
+ Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
+ Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "frame-unwind.h"
#include "command.h"
#include "gdbcmd.h"
-
-static void dummy_frame_this_id (struct frame_info *next_frame,
- void **this_prologue_cache,
- struct frame_id *this_id);
-
-static int pc_in_dummy_frame (CORE_ADDR pc);
+#include "gdb_string.h"
/* Dummy frame. This saves the processor state just prior to setting
up the inferior function call. Older targets save the registers
struct dummy_frame
{
struct dummy_frame *next;
-
- /* These values belong to the caller (the previous frame, the frame
- that this unwinds back to). */
- CORE_ADDR pc;
- CORE_ADDR fp;
- CORE_ADDR sp;
- CORE_ADDR top;
+ /* This frame's ID. Must match the value returned by
+ gdbarch_unwind_dummy_id. */
struct frame_id id;
+ /* The caller's regcache. */
struct regcache *regcache;
-
- /* Address range of the call dummy code. Look for PC in the range
- [LO..HI) (after allowing for DECR_PC_AFTER_BREAK). */
- CORE_ADDR call_lo;
- CORE_ADDR call_hi;
};
static struct dummy_frame *dummy_frame_stack = NULL;
-/* Function: find_dummy_frame(pc, fp, sp)
-
- Search the stack of dummy frames for one matching the given PC and
- FP/SP. Unlike pc_in_dummy_frame(), this function doesn't need to
- adjust for DECR_PC_AFTER_BREAK. This is because it is only legal
- to call this function after the PC has been adjusted. */
-
-static struct dummy_frame *
-find_dummy_frame (CORE_ADDR pc, CORE_ADDR fp)
-{
- struct dummy_frame *dummyframe;
-
- for (dummyframe = dummy_frame_stack; dummyframe != NULL;
- dummyframe = dummyframe->next)
- {
- /* Does the PC fall within the dummy frame's breakpoint
- instruction. If not, discard this one. */
- if (!(pc >= dummyframe->call_lo && pc < dummyframe->call_hi))
- continue;
- /* Does the FP match? */
- if (dummyframe->top != 0)
- {
- /* If the target architecture explicitly saved the
- top-of-stack before the inferior function call, assume
- that that same architecture will always pass in an FP
- (frame base) value that eactly matches that saved TOS.
- Don't check the saved SP and SP as they can lead to false
- hits. */
- if (fp != dummyframe->top)
- continue;
- }
- else
- {
- /* An older target that hasn't explicitly or implicitly
- saved the dummy frame's top-of-stack. Try matching the
- FP against the saved SP and FP. NOTE: If you're trying
- to fix a problem with GDB not correctly finding a dummy
- frame, check the comments that go with FRAME_ALIGN() and
- UNWIND_DUMMY_ID(). */
- if (fp != dummyframe->fp && fp != dummyframe->sp)
- continue;
- }
- /* The FP matches this dummy frame. */
- return dummyframe;
- }
-
- return NULL;
-}
+/* Function: deprecated_pc_in_call_dummy (pc)
-struct regcache *
-deprecated_find_dummy_frame_regcache (CORE_ADDR pc, CORE_ADDR fp)
-{
- struct dummy_frame *dummy = find_dummy_frame (pc, fp);
- if (dummy != NULL)
- return dummy->regcache;
- else
- return NULL;
-}
+ Return non-zero if the PC falls in a dummy frame created by gdb for
+ an inferior call. The code below which allows gdbarch_decr_pc_after_break
+ is for infrun.c, which may give the function a PC without that
+ subtracted out.
-char *
-deprecated_generic_find_dummy_frame (CORE_ADDR pc, CORE_ADDR fp)
-{
- struct regcache *regcache = deprecated_find_dummy_frame_regcache (pc, fp);
- if (regcache == NULL)
- return NULL;
- return deprecated_grub_regcache_for_registers (regcache);
-}
+ FIXME: cagney/2002-11-23: This is silly. Surely "infrun.c" can
+ figure out what the real PC (as in the resume address) is BEFORE
+ calling this function.
-/* Function: pc_in_call_dummy (pc, sp, fp)
+ NOTE: cagney/2004-08-02: I'm pretty sure that, with the introduction of
+ infrun.c:adjust_pc_after_break (thanks), this function is now
+ always called with a correctly adjusted PC!
- Return true if the PC falls in a dummy frame created by gdb for an
- inferior call. The code below which allows DECR_PC_AFTER_BREAK is
- for infrun.c, which may give the function a PC without that
- subtracted out. */
+ NOTE: cagney/2004-08-02: Code should not need to call this. */
int
-deprecated_pc_in_call_dummy (CORE_ADDR pc, CORE_ADDR sp, CORE_ADDR fp)
-{
- return pc_in_dummy_frame (pc);
-}
-
-/* Return non-zero if the PC falls in a dummy frame.
-
- The code below which allows DECR_PC_AFTER_BREAK is for infrun.c,
- which may give the function a PC without that subtracted out.
-
- FIXME: cagney/2002-11-23: This is silly. Surely "infrun.c" can
- figure out what the real PC (as in the resume address) is BEFORE
- calling this function (Oh, and I'm not even sure that this function
- is called with an decremented PC, the call to pc_in_call_dummy() in
- that file is conditional on
- !DEPRECATED_CALL_DUMMY_BREAKPOINT_OFFSET_P yet generic dummy
- targets set DEPRECATED_CALL_DUMMY_BREAKPOINT_OFFSET. True?). */
-
-static int
-pc_in_dummy_frame (CORE_ADDR pc)
+deprecated_pc_in_call_dummy (CORE_ADDR pc)
{
struct dummy_frame *dummyframe;
for (dummyframe = dummy_frame_stack;
dummyframe != NULL;
dummyframe = dummyframe->next)
{
- if ((pc >= dummyframe->call_lo)
- && (pc < dummyframe->call_hi + DECR_PC_AFTER_BREAK))
+ if ((pc >= dummyframe->id.code_addr)
+ && (pc <= dummyframe->id.code_addr
+ + gdbarch_decr_pc_after_break (current_gdbarch)))
return 1;
}
return 0;
}
-/* Function: read_register_dummy
- Find a saved register from before GDB calls a function in the inferior */
-
-CORE_ADDR
-deprecated_read_register_dummy (CORE_ADDR pc, CORE_ADDR fp, int regno)
-{
- struct regcache *dummy_regs = deprecated_find_dummy_frame_regcache (pc, fp);
-
- if (dummy_regs)
- {
- /* NOTE: cagney/2002-08-12: Replaced a call to
- regcache_raw_read_as_address() with a call to
- regcache_cooked_read_unsigned(). The old, ...as_address
- function was eventually calling extract_unsigned_integer (nee
- extract_address) to unpack the registers value. The below is
- doing an unsigned extract so that it is functionally
- equivalent. The read needs to be cooked as, otherwise, it
- will never correctly return the value of a register in the
- [NUM_REGS .. NUM_REGS+NUM_PSEUDO_REGS) range. */
- ULONGEST val;
- regcache_cooked_read_unsigned (dummy_regs, regno, &val);
- return val;
- }
- else
- return 0;
-}
-
-/* Save all the registers on the dummy frame stack. Most ports save the
- registers on the target stack. This results in lots of unnecessary memory
- references, which are slow when debugging via a serial line. Instead, we
- save all the registers internally, and never write them to the stack. The
- registers get restored when the called function returns to the entry point,
- where a breakpoint is laying in wait. */
+/* Push the caller's state, along with the dummy frame info, onto a
+ dummy-frame stack. */
void
-generic_push_dummy_frame (void)
+dummy_frame_push (struct regcache *caller_regcache,
+ const struct frame_id *dummy_id)
{
+ struct gdbarch *gdbarch = get_regcache_arch (caller_regcache);
struct dummy_frame *dummy_frame;
- CORE_ADDR fp = get_frame_base (get_current_frame ());
-
- /* check to see if there are stale dummy frames,
- perhaps left over from when a longjump took us out of a
- function that was called by the debugger */
+ /* Check to see if there are stale dummy frames, perhaps left over
+ from when a longjump took us out of a function that was called by
+ the debugger. */
dummy_frame = dummy_frame_stack;
while (dummy_frame)
- if (INNER_THAN (dummy_frame->fp, fp)) /* stale -- destroy! */
+ /* FIXME: cagney/2004-08-02: Should just test IDs. */
+ if (frame_id_inner (gdbarch, dummy_frame->id, (*dummy_id)))
+ /* Stale -- destroy! */
{
dummy_frame_stack = dummy_frame->next;
regcache_xfree (dummy_frame->regcache);
else
dummy_frame = dummy_frame->next;
- dummy_frame = xmalloc (sizeof (struct dummy_frame));
- dummy_frame->regcache = regcache_xmalloc (current_gdbarch);
-
- dummy_frame->pc = read_pc ();
- dummy_frame->sp = read_sp ();
- dummy_frame->top = 0;
- dummy_frame->fp = fp;
- dummy_frame->id = get_frame_id (get_current_frame ());
- regcache_cpy (dummy_frame->regcache, current_regcache);
+ dummy_frame = XZALLOC (struct dummy_frame);
+ dummy_frame->regcache = caller_regcache;
+ dummy_frame->id = (*dummy_id);
dummy_frame->next = dummy_frame_stack;
dummy_frame_stack = dummy_frame;
}
-void
-generic_save_dummy_frame_tos (CORE_ADDR sp)
-{
- dummy_frame_stack->top = sp;
-}
-
-/* Record the upper/lower bounds on the address of the call dummy. */
-
-void
-generic_save_call_dummy_addr (CORE_ADDR lo, CORE_ADDR hi)
+/* Return the dummy frame cache, it contains both the ID, and a
+ pointer to the regcache. */
+struct dummy_frame_cache
{
- dummy_frame_stack->call_lo = lo;
- dummy_frame_stack->call_hi = hi;
-}
-
-/* Discard the innermost dummy frame from the dummy frame stack
- (passed in as a parameter). */
-
-static void
-discard_innermost_dummy (struct dummy_frame **stack)
-{
- struct dummy_frame *tbd = (*stack);
- (*stack) = (*stack)->next;
- regcache_xfree (tbd->regcache);
- xfree (tbd);
-}
+ struct frame_id this_id;
+ struct regcache *prev_regcache;
+};
-void
-deprecated_pop_dummy_frame (void)
+int
+dummy_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *next_frame,
+ void **this_prologue_cache)
{
- struct dummy_frame *dummy_frame = dummy_frame_stack;
-
- /* FIXME: what if the first frame isn't the right one, eg..
- because one call-by-hand function has done a longjmp into another one? */
+ struct dummy_frame *dummyframe;
+ struct frame_id this_id;
- if (!dummy_frame)
- error ("Can't pop dummy frame!");
- regcache_cpy (current_regcache, dummy_frame->regcache);
- flush_cached_frames ();
+ /* When unwinding a normal frame, the stack structure is determined
+ by analyzing the frame's function's code (be it using brute force
+ prologue analysis, or the dwarf2 CFI). In the case of a dummy
+ frame, that simply isn't possible. The PC is either the program
+ entry point, or some random address on the stack. Trying to use
+ that PC to apply standard frame ID unwind techniques is just
+ asking for trouble. */
+
+ /* Don't bother unles there is at least one dummy frame. */
+ if (dummy_frame_stack != NULL)
+ {
+ /* Use an architecture specific method to extract the prev's
+ dummy ID from the next frame. Note that this method uses
+ frame_register_unwind to obtain the register values needed to
+ determine the dummy frame's ID. */
+ this_id = gdbarch_unwind_dummy_id (get_frame_arch (next_frame),
+ next_frame);
- discard_innermost_dummy (&dummy_frame_stack);
+ /* Use that ID to find the corresponding cache entry. */
+ for (dummyframe = dummy_frame_stack;
+ dummyframe != NULL;
+ dummyframe = dummyframe->next)
+ {
+ if (frame_id_eq (dummyframe->id, this_id))
+ {
+ struct dummy_frame_cache *cache;
+ cache = FRAME_OBSTACK_ZALLOC (struct dummy_frame_cache);
+ cache->prev_regcache = dummyframe->regcache;
+ cache->this_id = this_id;
+ (*this_prologue_cache) = cache;
+ return 1;
+ }
+ }
+ }
+ return 0;
}
/* Given a call-dummy dummy-frame, return the registers. Here the
void **this_prologue_cache,
int regnum, int *optimized,
enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnum, void *bufferp)
+ int *realnum, gdb_byte *bufferp)
{
- struct dummy_frame *dummy;
- struct frame_id id;
-
- /* Call the ID method which, if at all possible, will set the
- prologue cache. */
- dummy_frame_this_id (next_frame, this_prologue_cache, &id);
- dummy = (*this_prologue_cache);
- gdb_assert (dummy != NULL);
+ /* The dummy-frame sniffer always fills in the cache. */
+ struct dummy_frame_cache *cache = (*this_prologue_cache);
+ gdb_assert (cache != NULL);
/* Describe the register's location. Generic dummy frames always
have the register value in an ``expression''. */
/* Use the regcache_cooked_read() method so that it, on the fly,
constructs either a raw or pseudo register from the raw
register cache. */
- regcache_cooked_read (dummy->regcache, regnum, bufferp);
+ regcache_cooked_read (cache->prev_regcache, regnum, bufferp);
}
}
void **this_prologue_cache,
struct frame_id *this_id)
{
- struct dummy_frame *dummy = (*this_prologue_cache);
- if (dummy != NULL)
- {
- (*this_id) = dummy->id;
- return;
- }
- /* When unwinding a normal frame, the stack structure is determined
- by analyzing the frame's function's code (be it using brute force
- prologue analysis, or the dwarf2 CFI). In the case of a dummy
- frame, that simply isn't possible. The The PC is either the
- program entry point, or some random address on the stack. Trying
- to use that PC to apply standard frame ID unwind techniques is
- just asking for trouble. */
- if (gdbarch_unwind_dummy_id_p (current_gdbarch))
- {
- /* Use an architecture specific method to extract the prev's
- dummy ID from the next frame. Note that this method uses
- frame_register_unwind to obtain the register values needed to
- determine the dummy frame's ID. */
- (*this_id) = gdbarch_unwind_dummy_id (current_gdbarch, next_frame);
- }
- else if (get_frame_type (next_frame) == SENTINEL_FRAME)
- {
- /* We're unwinding a sentinel frame, the PC of which is pointing
- at a stack dummy. Fake up the dummy frame's ID using the
- same sequence as is found a traditional unwinder. Once all
- architectures supply the unwind_dummy_id method, this code
- can go away. */
- (*this_id) = frame_id_build (deprecated_read_fp (), read_pc ());
- }
- else if (legacy_frame_p (current_gdbarch)
- && get_prev_frame (next_frame))
- {
- /* Things are looking seriously grim! Assume that the legacy
- get_prev_frame code has already created THIS frame and linked
- it in to the frame chain (a pretty bold assumption), extract
- the ID from THIS base / pc. */
- (*this_id) = frame_id_build (get_frame_base (get_prev_frame (next_frame)),
- get_frame_pc (get_prev_frame (next_frame)));
- }
- else
- {
- /* Ouch! We're not trying to find the innermost frame's ID yet
- we're trying to unwind to a dummy. The architecture must
- provide the unwind_dummy_id() method. Abandon the unwind
- process but only after first warning the user. */
- internal_warning (__FILE__, __LINE__,
- "Missing unwind_dummy_id architecture method");
- (*this_id) = null_frame_id;
- return;
- }
- (*this_prologue_cache) = find_dummy_frame ((*this_id).code_addr,
- (*this_id).stack_addr);
+ /* The dummy-frame sniffer always fills in the cache. */
+ struct dummy_frame_cache *cache = (*this_prologue_cache);
+ gdb_assert (cache != NULL);
+ (*this_id) = cache->this_id;
}
-static struct frame_unwind dummy_frame_unwind =
+static const struct frame_unwind dummy_frame_unwinder =
{
DUMMY_FRAME,
dummy_frame_this_id,
- dummy_frame_prev_register
+ dummy_frame_prev_register,
+ NULL,
+ dummy_frame_sniffer,
};
-const struct frame_unwind *
-dummy_frame_sniffer (struct frame_info *next_frame)
-{
- CORE_ADDR pc = frame_pc_unwind (next_frame);
- if (pc_in_dummy_frame (pc))
- return &dummy_frame_unwind;
- else
- return NULL;
-}
+const struct frame_unwind *const dummy_frame_unwind = {
+ &dummy_frame_unwinder
+};
static void
fprint_dummy_frames (struct ui_file *file)
{
gdb_print_host_address (s, file);
fprintf_unfiltered (file, ":");
- fprintf_unfiltered (file, " pc=0x%s", paddr (s->pc));
- fprintf_unfiltered (file, " fp=0x%s", paddr (s->fp));
- fprintf_unfiltered (file, " sp=0x%s", paddr (s->sp));
- fprintf_unfiltered (file, " top=0x%s", paddr (s->top));
fprintf_unfiltered (file, " id=");
fprint_frame_id (file, s->id);
- fprintf_unfiltered (file, " call_lo=0x%s", paddr (s->call_lo));
- fprintf_unfiltered (file, " call_hi=0x%s", paddr (s->call_hi));
fprintf_unfiltered (file, "\n");
}
}
{
struct ui_file *file = gdb_fopen (args, "w");
if (file == NULL)
- perror_with_name ("maintenance print dummy-frames");
+ perror_with_name (_("maintenance print dummy-frames"));
fprint_dummy_frames (file);
ui_file_delete (file);
}
_initialize_dummy_frame (void)
{
add_cmd ("dummy-frames", class_maintenance, maintenance_print_dummy_frames,
- "Print the contents of the internal dummy-frame stack.",
+ _("Print the contents of the internal dummy-frame stack."),
&maintenanceprintlist);
}
projects / deliverable / binutils-gdb.git / blobdiff