CORE_ADDR pc;
{
struct frame_info *fci; /* Same type as FRAME */
+ char *name;
fci = (struct frame_info *)
obstack_alloc (&frame_cache_obstack,
fci->prev = (struct frame_info *) 0;
fci->frame = addr;
fci->pc = pc;
- fci->signal_handler_caller = IN_SIGTRAMP (fci->pc, (char *)NULL);
+ find_pc_partial_function (pc, &name, (CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
+ fci->signal_handler_caller = IN_SIGTRAMP (fci->pc, name);
#ifdef INIT_EXTRA_FRAME_INFO
INIT_EXTRA_FRAME_INFO (0, fci);
FRAME_ADDR address;
struct frame_info *prev;
int fromleaf = 0;
+ char *name;
/* If the requested entry is in the cache, return it.
Otherwise, figure out what the address should be for the entry
(see tm-sparc.h). We want the pc saved in the inferior frame. */
INIT_FRAME_PC(fromleaf, prev);
- if (IN_SIGTRAMP (prev->pc, (char *)NULL))
+ find_pc_partial_function (prev->pc, &name,
+ (CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
+ if (IN_SIGTRAMP (prev->pc, name))
prev->signal_handler_caller = 1;
return prev;
cache_pc_function_name = (char *)0;
}
-/* Finds the "function" (text symbol) that is smaller than PC
- but greatest of all of the potential text symbols. Sets
- *NAME and/or *ADDRESS conditionally if that pointer is non-zero.
- Returns 0 if it couldn't find anything, 1 if it did. On a zero
- return, *NAME and *ADDRESS are always set to zero. On a 1 return,
- *NAME and *ADDRESS contain real information. */
+/* Finds the "function" (text symbol) that is smaller than PC but
+ greatest of all of the potential text symbols. Sets *NAME and/or
+ *ADDRESS conditionally if that pointer is non-null. If ENDADDR is
+ non-null, then set *ENDADDR to be the end of the function
+ (exclusive), but passing ENDADDR as non-null means that the
+ function might cause symbols to be read. This function either
+ succeeds or fails (not halfway succeeds). If it succeeds, it sets
+ *NAME, *ADDRESS, and *ENDADDR to real information and returns 1.
+ If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero
+ and returns 0. */
int
-find_pc_partial_function (pc, name, address)
+find_pc_partial_function (pc, name, address, endaddr)
CORE_ADDR pc;
char **name;
CORE_ADDR *address;
+ CORE_ADDR *endaddr;
{
struct partial_symtab *pst;
struct symbol *f;
struct partial_symbol *psb;
if (pc >= cache_pc_function_low && pc < cache_pc_function_high)
+ goto return_cached_value;
+
+ /* If sigtramp is in the u area, it counts as a function (especially
+ important for step_1). */
+#if defined SIGTRAMP_START
+ if (IN_SIGTRAMP (pc, (char *)NULL))
{
- if (address)
- *address = cache_pc_function_low;
- if (name)
- *name = cache_pc_function_name;
- return 1;
+ cache_pc_function_low = SIGTRAMP_START;
+ cache_pc_function_high = SIGTRAMP_END;
+ cache_pc_function_name = "<sigtramp>";
+
+ goto return_cached_value;
}
+#endif
+ msymbol = lookup_minimal_symbol_by_pc (pc);
pst = find_pc_psymtab (pc);
if (pst)
{
+ /* Need to read the symbols to get a good value for the end address. */
+ if (endaddr != NULL && !pst->readin)
+ PSYMTAB_TO_SYMTAB (pst);
+
if (pst->readin)
{
- /* The information we want has already been read in.
- We can go to the already readin symbols and we'll get
- the best possible answer. */
+ /* Checking whether the msymbol has a larger value is for the
+ "pathological" case mentioned in print_frame_info. */
f = find_pc_function (pc);
- if (!f)
+ if (f != NULL
+ && (msymbol == NULL
+ || (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
+ >= SYMBOL_VALUE_ADDRESS (msymbol))))
{
- return_error:
- /* No available symbol. */
- if (name != 0)
- *name = 0;
- if (address != 0)
- *address = 0;
- return 0;
+ cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
+ cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
+ cache_pc_function_name = SYMBOL_NAME (f);
+ goto return_cached_value;
}
-
- cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
- cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
- cache_pc_function_name = SYMBOL_NAME (f);
- if (name)
- *name = cache_pc_function_name;
- if (address)
- *address = cache_pc_function_low;
- return 1;
}
- /* Get the information from a combination of the pst
- (static symbols), and the minimal symbol table (extern
- symbols). */
- msymbol = lookup_minimal_symbol_by_pc (pc);
+ /* Now that static symbols go in the minimal symbol table, perhaps
+ we could just ignore the partial symbols. But at least for now
+ we use the partial or minimal symbol, whichever is larger. */
psb = find_pc_psymbol (pst, pc);
- if (!psb && (msymbol == NULL))
- {
- goto return_error;
- }
if (psb
&& (msymbol == NULL ||
(SYMBOL_VALUE_ADDRESS (psb) >= SYMBOL_VALUE_ADDRESS (msymbol))))
*address = SYMBOL_VALUE_ADDRESS (psb);
if (name)
*name = SYMBOL_NAME (psb);
+ /* endaddr non-NULL can't happen here. */
return 1;
}
}
- else
- /* Must be in the minimal symbol table. */
+
+ /* Must be in the minimal symbol table. */
+ if (msymbol == NULL)
{
- msymbol = lookup_minimal_symbol_by_pc (pc);
- if (msymbol == NULL)
- goto return_error;
+ /* No available symbol. */
+ if (name != NULL)
+ *name = 0;
+ if (address != NULL)
+ *address = 0;
+ if (endaddr != NULL)
+ *endaddr = 0;
+ return 0;
}
- {
- if (msymbol -> type == mst_text)
- cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
- else
- /* It is a transfer table for Sun shared libraries. */
- cache_pc_function_low = pc - FUNCTION_START_OFFSET;
- }
+ /* I believe the purpose of this check is to make sure that anything
+ beyond the end of the text segment does not appear as part of the
+ last function of the text segment. It assumes that there is something
+ other than a mst_text symbol after the text segment. It is broken in
+ various cases, so anything relying on this behavior (there might be
+ some places) should be using find_pc_section or some such instead. */
+ if (msymbol -> type == mst_text)
+ cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
+ else
+ /* It is a transfer table for Sun shared libraries. */
+ cache_pc_function_low = pc - FUNCTION_START_OFFSET;
cache_pc_function_name = SYMBOL_NAME (msymbol);
- /* FIXME: Deal with bumping into end of minimal symbols for a given
- objfile, and what about testing for mst_text again? */
+
if (SYMBOL_NAME (msymbol + 1) != NULL)
+ /* This might be part of a different segment, which might be a bad
+ idea. Perhaps we should be using the smaller of this address or the
+ endaddr from find_pc_section. */
cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + 1);
else
- cache_pc_function_high = cache_pc_function_low + 1;
+ {
+ /* We got the start address from the last msymbol in the objfile.
+ So the end address is the end of the section. */
+ struct obj_section *sec;
+
+ sec = find_pc_section (pc);
+ if (sec == NULL)
+ {
+ /* Don't know if this can happen but if it does, then just say
+ that the function is 1 byte long. */
+ cache_pc_function_high = cache_pc_function_low + 1;
+ }
+ else
+ cache_pc_function_high = sec->endaddr;
+ }
+
+ return_cached_value:
if (address)
*address = cache_pc_function_low;
if (name)
*name = cache_pc_function_name;
+ if (endaddr)
+ *endaddr = cache_pc_function_high;
return 1;
}
#endif /* 0 */
+#ifdef SIGCONTEXT_PC_OFFSET
+/* Get saved user PC for sigtramp from sigcontext for BSD style sigtramp. */
+
+CORE_ADDR
+sigtramp_saved_pc (frame)
+ FRAME frame;
+{
+ CORE_ADDR sigcontext_addr;
+ char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+ int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
+ int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
+
+ /* Get sigcontext address, it is the third parameter on the stack. */
+ if (frame->next)
+ sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next)
+ + FRAME_ARGS_SKIP + sigcontext_offs,
+ ptrbytes);
+ else
+ sigcontext_addr = read_memory_integer (read_register (SP_REGNUM)
+ + sigcontext_offs,
+ ptrbytes);
+
+ /* Don't cause a memory_error when accessing sigcontext in case the stack
+ layout has changed or the stack is corrupt. */
+ target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
+ return extract_unsigned_integer (buf, ptrbytes);
+}
+#endif /* SIGCONTEXT_PC_OFFSET */
+
void
_initialize_blockframe ()
{
/* Definitions for dealing with stack frames, for GDB, the GNU debugger.
- Copyright (C) 1986, 1989 Free Software Foundation, Inc.
+ Copyright 1986, 1989, 1991, 1992 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+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 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#if !defined (FRAME_H)
#define FRAME_H 1
-#include "param.h"
-
-/*
- * FRAME is the type of the identifier of a specific stack frame. It
- * is a pointer to the frame cache item corresponding to this frame.
- * Please note that frame id's are *not* constant over calls to the
- * inferior. Use frame addresses, which are.
- *
- * FRAME_ADDR is the type of the address of a specific frame. I
- * cannot imagine a case in which this would not be CORE_ADDR, so
- * maybe it's silly to give it it's own type. Life's rough.
- *
- * FRAME_FP is a macro which converts from a frame identifier into a
- * frame_address.
- *
- * FRAME_INFO_ID is a macro which "converts" from a frame info pointer
- * to a frame id. This is here in case I or someone else decides to
- * change the FRAME type again.
- *
- * This file and blockframe.c are the only places which are allowed to
- * use the equivalence between FRAME and struct frame_info *. EXCEPTION:
- * value.h uses CORE_ADDR instead of FRAME_ADDR because the compiler
- * will accept that in the absense of this file.
- */
+
+/* A FRAME identifies a specific stack frame. It is not constant over
+ calls to the inferior (frame addresses are, see below).
+
+ This is implemented as a "struct frame_info *". This file and
+ blockframe.c are the only places which are allowed to use the
+ equivalence between FRAME and struct frame_info *. Exception:
+ Prototypes in other files use "struct frame_info *" because this
+ file might not be included.
+
+ The distinction between a FRAME and a "struct frame_info *" is made
+ with the idea of maybe someday changing a FRAME to be something else,
+ but seems to me that a "struct frame_info *" is fully general (since
+ any necessarily fields can be added; changing the meaning of existing
+ fields is not helped by the FRAME distinction), and this distinction
+ merely creates unnecessary hair. -kingdon, 18 May 93. */
typedef struct frame_info *FRAME;
+
+/* Convert from a "struct frame_info *" into a FRAME. */
+#define FRAME_INFO_ID(f) (f)
+
+/* Convert from a FRAME into a "struct frame_info *". */
+extern struct frame_info *
+get_frame_info PARAMS ((FRAME));
+
+/* Type of the address of a frame. It is widely assumed (at least in
+ prototypes in headers which might not include this header) that
+ this is the same as CORE_ADDR, and no one can think of a case in
+ which it wouldn't be, so it might be best to remove this typedef. */
typedef CORE_ADDR FRAME_ADDR;
+
+/* Convert from a FRAME into a frame address. Except in the
+ machine-dependent *FRAME* macros, a frame address has no defined
+ meaning other than as a magic cookie which identifies a frame over
+ calls to the inferior. The only known exception is inferior.h
+ (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot
+ assume that a frame address contains enough information to
+ reconstruct the frame; if you want more than just to identify the
+ frame (e.g. be able to fetch variables relative to that frame),
+ then save the whole struct frame_info (and the next struct
+ frame_info, since the latter is used for fetching variables on some
+ machines). */
+
#define FRAME_FP(fr) ((fr)->frame)
-#define FRAME_INFO_ID(f) (f)
-/*
- * Caching structure for stack frames. This is also the structure
- * used for extended info about stack frames. May add more to this
- * structure as it becomes necessary.
- *
- * Note that the first entry in the cache will always refer to the
- * innermost executing frame. This value should be set (is it?
- * Check) in something like normal_stop.
- */
+/* We keep a cache of stack frames, each of which is a "struct
+ frame_info". The innermost one gets allocated (in
+ wait_for_inferior) each time the inferior stops; current_frame
+ points to it. Additional frames get allocated (in
+ get_prev_frame_info) as needed, and are chained through the next
+ and prev fields. Any time that the frame cache becomes invalid
+ (most notably when we execute something, but also if we change how
+ we interpret the frames (e.g. "set heuristic-fence-post" in
+ mips-tdep.c, or anything which reads new symbols)), we should call
+ reinit_frame_cache. */
+
struct frame_info
{
- /* Nominal address of the frame described. */
+ /* Nominal address of the frame described. See comments at FRAME_FP
+ about what this means outside the *FRAME* macros; in the *FRAME*
+ macros, it can mean whatever makes most sense for this machine. */
FRAME_ADDR frame;
+
/* Address at which execution is occurring in this frame.
For the innermost frame, it's the current pc.
For other frames, it is a pc saved in the next frame. */
CORE_ADDR pc;
- /* The frame called by the frame we are describing, or 0.
- This may be set even if there isn't a frame called by the one
- we are describing (.->next == 0); in that case it is simply the
- bottom of this frame */
- FRAME_ADDR next_frame;
+
+ /* Nonzero if this is a frame associated with calling a signal handler.
+
+ Set by machine-dependent code. On some machines, if
+ the machine-dependent code fails to check for this, the backtrace
+ will look relatively normal. For example, on the i386
+ #3 0x158728 in sighold ()
+ On other machines (e.g. rs6000), the machine-dependent code better
+ set this to prevent us from trying to print it like a normal frame. */
+ int signal_handler_caller;
+
/* Anything extra for this structure that may have been defined
in the machine depedent files. */
#ifdef EXTRA_FRAME_INFO
EXTRA_FRAME_INFO
#endif
- /* Pointers to the next and previous frame_info's in this stack. */
+
+ /* We should probably also store a "struct frame_saved_regs" here.
+ This is already done by some machines (e.g. config/m88k/tm-m88k.h)
+ but there is no reason it couldn't be general. */
+
+ /* Pointers to the next and previous frame_info's in the frame cache. */
FRAME next, prev;
};
struct frame_saved_regs
{
- /* For each register, address of where it was saved on entry to the frame,
- or zero if it was not saved on entry to this frame. */
+
+ /* For each register, address of where it was saved on entry to
+ the frame, or zero if it was not saved on entry to this frame.
+ This includes special registers such as pc and fp saved in
+ special ways in the stack frame. The SP_REGNUM is even more
+ special, the address here is the sp for the next frame, not the
+ address where the sp was saved. */
+
CORE_ADDR regs[NUM_REGS];
};
+/* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
+ targets. If FRAME_CHAIN_VALID returns zero it means that the given frame
+ is the outermost one and has no caller.
+
+ If a particular target needs a different definition, then it can override
+ the definition here by providing one in the tm file. */
+
+#if !defined (FRAME_CHAIN_VALID)
+
+#if defined (FRAME_CHAIN_VALID_ALTERNATE)
+
+/* Use the alternate method of avoiding running up off the end of the frame
+ chain or following frames back into the startup code. See the comments
+ in objfiles.h. */
+
+#define FRAME_CHAIN_VALID(chain, thisframe) \
+ ((chain) != 0 \
+ && !inside_main_func ((thisframe) -> pc) \
+ && !inside_entry_func ((thisframe) -> pc))
+
+#else
+
+#define FRAME_CHAIN_VALID(chain, thisframe) \
+ ((chain) != 0 \
+ && !inside_entry_file (FRAME_SAVED_PC (thisframe)))
+
+#endif /* FRAME_CHAIN_VALID_ALTERNATE */
+
+#endif /* FRAME_CHAIN_VALID */
+
+/* If we encounter a request to use base register addressing of variables
+ on a machine for which gdb has not been configured to support such
+ access, report the failure to support this access mode. */
+
+#if !defined (FRAME_GET_BASEREG_VALUE)
+
+#define FRAME_GET_BASEREG_VALUE(frame, regno) \
+ (error ("Missing valid method for finding contents of base register."),0)
+
+#endif
+
/* The stack frame that the user has specified for commands to act on.
Note that one cannot assume this is the address of valid data. */
extern FRAME selected_frame;
-extern struct frame_info *get_frame_info ();
-extern struct frame_info *get_prev_frame_info ();
+/* Level of the selected frame:
+ 0 for innermost, 1 for its caller, ...
+ or -1 for frame specified by address with no defined level. */
+
+extern int selected_frame_level;
+
+extern struct frame_info *
+get_prev_frame_info PARAMS ((FRAME));
+
+extern FRAME
+create_new_frame PARAMS ((FRAME_ADDR, CORE_ADDR));
+
+extern void
+flush_cached_frames PARAMS ((void));
+
+extern void
+reinit_frame_cache PARAMS ((void));
+
+extern void
+get_frame_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
+
+extern void
+set_current_frame PARAMS ((FRAME));
+
+extern FRAME
+get_prev_frame PARAMS ((FRAME));
+
+extern FRAME
+get_current_frame PARAMS ((void));
+
+extern FRAME
+get_next_frame PARAMS ((FRAME));
+
+extern struct block *
+get_frame_block PARAMS ((FRAME));
+
+extern struct block *
+get_current_block PARAMS ((void));
+
+extern struct block *
+get_selected_block PARAMS ((void));
+
+extern struct symbol *
+get_frame_function PARAMS ((FRAME));
+
+extern CORE_ADDR
+get_frame_pc PARAMS ((FRAME));
+
+extern CORE_ADDR
+get_pc_function_start PARAMS ((CORE_ADDR));
+
+extern struct block *
+block_for_pc PARAMS ((CORE_ADDR));
+
+extern int
+frameless_look_for_prologue PARAMS ((FRAME));
+
+extern void
+print_frame_args PARAMS ((struct symbol *, struct frame_info *, int, FILE *));
-extern FRAME create_new_frame ();
-extern void flush_cached_frames ();
+extern FRAME
+find_relative_frame PARAMS ((FRAME, int*));
-extern void get_frame_saved_regs ();
+extern void
+print_stack_frame PARAMS ((FRAME, int, int));
-extern void set_current_frame ();
-extern FRAME get_prev_frame ();
-extern FRAME get_current_frame ();
-extern FRAME get_next_frame ();
+extern void
+select_frame PARAMS ((FRAME, int));
-extern struct block *get_frame_block ();
-extern struct block *get_current_block ();
-extern struct block *get_selected_block ();
-extern struct symbol *get_frame_function ();
-extern CORE_ADDR get_frame_pc ();
-extern CORE_ADDR get_pc_function_start ();
-struct block *block_for_pc ();
+extern void
+record_selected_frame PARAMS ((FRAME_ADDR *, int *));
-int frameless_look_for_prologue ();
+extern void
+print_frame_info PARAMS ((struct frame_info *, int, int, int));
-void print_frame_args ();
+extern CORE_ADDR
+find_saved_register PARAMS ((FRAME, int));
-/* In stack.c */
-extern FRAME find_relative_frame ();
-extern void print_selected_frame ();
-extern void print_sel_frame ();
-extern void select_frame ();
-extern void record_selected_frame ();
+extern CORE_ADDR
+sigtramp_saved_pc PARAMS ((FRAME));
-#endif /* frame.h not already included. */
+#endif /* !defined (FRAME_H) */
projects / binutils-gdb.git / commitdiff