0714963c79
* frame.c (get_prev_frame): Move disabled inside_entry_func to before code inhibiting repeated unwind attempts. Add to commentary on that test's problems. * blockframe.c (inside_main_func): Look for "main" in the minimal symbol table. * d10v-tdep.c (d10v_frame_this_id): Delete check that frames are identical. Index: testsuite/ChangeLog 2003-07-15 Andrew Cagney <cagney@redhat.com> * gdb.asm/asm-source.exp: Do not allow "start" in the backtrace.
615 lines
19 KiB
C
615 lines
19 KiB
C
/* Get info from stack frames; convert between frames, blocks,
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functions and pc values.
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Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
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1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
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Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "symtab.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "value.h" /* for read_register */
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#include "target.h" /* for target_has_stack */
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#include "inferior.h" /* for read_pc */
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#include "annotate.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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#include "dummy-frame.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "block.h"
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/* Prototypes for exported functions. */
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void _initialize_blockframe (void);
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/* Is ADDR inside the startup file? Note that if your machine has a
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way to detect the bottom of the stack, there is no need to call
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this function from DEPRECATED_FRAME_CHAIN_VALID; the reason for
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doing so is that some machines have no way of detecting bottom of
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stack.
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A PC of zero is always considered to be the bottom of the stack. */
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int
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inside_entry_file (CORE_ADDR addr)
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{
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if (addr == 0)
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return 1;
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if (symfile_objfile == 0)
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return 0;
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if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
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{
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/* Do not stop backtracing if the pc is in the call dummy
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at the entry point. */
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/* FIXME: Won't always work with zeros for the last two arguments */
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if (DEPRECATED_PC_IN_CALL_DUMMY (addr, 0, 0))
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return 0;
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}
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return (addr >= symfile_objfile->ei.entry_file_lowpc &&
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addr < symfile_objfile->ei.entry_file_highpc);
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}
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/* Test a specified PC value to see if it is in the range of addresses
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that correspond to the main() function. See comments above for why
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we might want to do this.
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Typically called from DEPRECATED_FRAME_CHAIN_VALID.
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A PC of zero is always considered to be the bottom of the stack. */
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int
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inside_main_func (CORE_ADDR pc)
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{
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if (pc == 0)
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return 1;
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if (symfile_objfile == 0)
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return 0;
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/* If the addr range is not set up at symbol reading time, set it up
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now. This is for DEPRECATED_FRAME_CHAIN_VALID_ALTERNATE. I do
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this for coff, because it is unable to set it up and symbol
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reading time. */
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if (symfile_objfile->ei.main_func_lowpc == INVALID_ENTRY_LOWPC &&
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symfile_objfile->ei.main_func_highpc == INVALID_ENTRY_HIGHPC)
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{
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struct symbol *mainsym;
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mainsym = lookup_symbol (main_name (), NULL, VAR_DOMAIN, NULL, NULL);
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if (mainsym && SYMBOL_CLASS (mainsym) == LOC_BLOCK)
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{
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symfile_objfile->ei.main_func_lowpc =
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BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym));
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symfile_objfile->ei.main_func_highpc =
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BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym));
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}
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}
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/* Not in the normal symbol tables, see if "main" is in the partial
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symbol table. If it's not, then give up. */
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{
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struct minimal_symbol *msymbol
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= lookup_minimal_symbol (main_name (), NULL, symfile_objfile);
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if (msymbol != NULL && MSYMBOL_TYPE (msymbol) == mst_text)
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{
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struct obj_section *osect
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= find_pc_sect_section (SYMBOL_VALUE_ADDRESS (msymbol),
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msymbol->ginfo.bfd_section);
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if (osect != NULL)
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{
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int i;
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/* Step over other symbols at this same address, and
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symbols in other sections, to find the next symbol in
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this section with a different address. */
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for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++)
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{
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if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol)
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&& SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol))
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break;
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}
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symfile_objfile->ei.main_func_lowpc = SYMBOL_VALUE_ADDRESS (msymbol);
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/* Use the lesser of the next minimal symbol in the same
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section, or the end of the section, as the end of the
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function. */
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if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL
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&& SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr)
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symfile_objfile->ei.main_func_highpc = SYMBOL_VALUE_ADDRESS (msymbol + i);
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else
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/* We got the start address from the last msymbol in the
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objfile. So the end address is the end of the
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section. */
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symfile_objfile->ei.main_func_highpc = osect->endaddr;
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}
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}
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}
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return (symfile_objfile->ei.main_func_lowpc <= pc &&
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symfile_objfile->ei.main_func_highpc > pc);
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}
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/* Test a specified PC value to see if it is in the range of addresses
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that correspond to the process entry point function. See comments
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in objfiles.h for why we might want to do this.
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Typically called from DEPRECATED_FRAME_CHAIN_VALID.
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A PC of zero is always considered to be the bottom of the stack. */
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int
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inside_entry_func (CORE_ADDR pc)
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{
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if (pc == 0)
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return 1;
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if (symfile_objfile == 0)
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return 0;
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if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
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{
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/* Do not stop backtracing if the pc is in the call dummy
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at the entry point. */
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/* FIXME: Won't always work with zeros for the last two arguments */
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if (DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0))
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return 0;
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}
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return (symfile_objfile->ei.entry_func_lowpc <= pc &&
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symfile_objfile->ei.entry_func_highpc > pc);
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}
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/* Return nonzero if the function for this frame lacks a prologue. Many
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machines can define FRAMELESS_FUNCTION_INVOCATION to just call this
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function. */
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int
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frameless_look_for_prologue (struct frame_info *frame)
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{
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CORE_ADDR func_start;
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func_start = get_frame_func (frame);
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if (func_start)
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{
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func_start += FUNCTION_START_OFFSET;
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/* This is faster, since only care whether there *is* a
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prologue, not how long it is. */
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return PROLOGUE_FRAMELESS_P (func_start);
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}
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else if (get_frame_pc (frame) == 0)
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/* A frame with a zero PC is usually created by dereferencing a
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NULL function pointer, normally causing an immediate core dump
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of the inferior. Mark function as frameless, as the inferior
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has no chance of setting up a stack frame. */
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return 1;
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else
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/* If we can't find the start of the function, we don't really
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know whether the function is frameless, but we should be able
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to get a reasonable (i.e. best we can do under the
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circumstances) backtrace by saying that it isn't. */
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return 0;
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}
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/* Return the innermost lexical block in execution
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in a specified stack frame. The frame address is assumed valid.
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If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code
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address we used to choose the block. We use this to find a source
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line, to decide which macro definitions are in scope.
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The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's
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PC, and may not really be a valid PC at all. For example, in the
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caller of a function declared to never return, the code at the
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return address will never be reached, so the call instruction may
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be the very last instruction in the block. So the address we use
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to choose the block is actually one byte before the return address
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--- hopefully pointing us at the call instruction, or its delay
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slot instruction. */
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struct block *
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get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
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{
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const CORE_ADDR pc = get_frame_address_in_block (frame);
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if (addr_in_block)
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*addr_in_block = pc;
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return block_for_pc (pc);
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}
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CORE_ADDR
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get_pc_function_start (CORE_ADDR pc)
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{
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struct block *bl;
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struct minimal_symbol *msymbol;
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bl = block_for_pc (pc);
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if (bl)
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{
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struct symbol *symbol = block_function (bl);
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if (symbol)
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{
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bl = SYMBOL_BLOCK_VALUE (symbol);
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return BLOCK_START (bl);
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}
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}
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msymbol = lookup_minimal_symbol_by_pc (pc);
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if (msymbol)
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{
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CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol);
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if (find_pc_section (fstart))
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return fstart;
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}
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return 0;
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}
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/* Return the symbol for the function executing in frame FRAME. */
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struct symbol *
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get_frame_function (struct frame_info *frame)
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{
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register struct block *bl = get_frame_block (frame, 0);
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if (bl == 0)
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return 0;
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return block_function (bl);
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}
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/* Return the function containing pc value PC in section SECTION.
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Returns 0 if function is not known. */
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struct symbol *
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find_pc_sect_function (CORE_ADDR pc, struct sec *section)
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{
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register struct block *b = block_for_pc_sect (pc, section);
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if (b == 0)
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return 0;
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return block_function (b);
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}
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/* Return the function containing pc value PC.
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Returns 0 if function is not known. Backward compatibility, no section */
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struct symbol *
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find_pc_function (CORE_ADDR pc)
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{
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return find_pc_sect_function (pc, find_pc_mapped_section (pc));
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}
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/* These variables are used to cache the most recent result
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* of find_pc_partial_function. */
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static CORE_ADDR cache_pc_function_low = 0;
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static CORE_ADDR cache_pc_function_high = 0;
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static char *cache_pc_function_name = 0;
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static struct sec *cache_pc_function_section = NULL;
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/* Clear cache, e.g. when symbol table is discarded. */
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void
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clear_pc_function_cache (void)
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{
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cache_pc_function_low = 0;
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cache_pc_function_high = 0;
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cache_pc_function_name = (char *) 0;
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cache_pc_function_section = NULL;
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}
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/* Finds the "function" (text symbol) that is smaller than PC but
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greatest of all of the potential text symbols in SECTION. Sets
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*NAME and/or *ADDRESS conditionally if that pointer is non-null.
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If ENDADDR is non-null, then set *ENDADDR to be the end of the
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function (exclusive), but passing ENDADDR as non-null means that
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the function might cause symbols to be read. This function either
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succeeds or fails (not halfway succeeds). If it succeeds, it sets
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*NAME, *ADDRESS, and *ENDADDR to real information and returns 1.
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If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and
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returns 0. */
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int
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find_pc_sect_partial_function (CORE_ADDR pc, asection *section, char **name,
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CORE_ADDR *address, CORE_ADDR *endaddr)
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{
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struct partial_symtab *pst;
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struct symbol *f;
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struct minimal_symbol *msymbol;
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struct partial_symbol *psb;
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struct obj_section *osect;
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int i;
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CORE_ADDR mapped_pc;
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mapped_pc = overlay_mapped_address (pc, section);
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if (mapped_pc >= cache_pc_function_low
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&& mapped_pc < cache_pc_function_high
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&& section == cache_pc_function_section)
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goto return_cached_value;
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/* If sigtramp is in the u area, it counts as a function (especially
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important for step_1). */
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if (SIGTRAMP_START_P () && PC_IN_SIGTRAMP (mapped_pc, (char *) NULL))
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{
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cache_pc_function_low = SIGTRAMP_START (mapped_pc);
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cache_pc_function_high = SIGTRAMP_END (mapped_pc);
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cache_pc_function_name = "<sigtramp>";
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cache_pc_function_section = section;
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goto return_cached_value;
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}
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msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section);
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pst = find_pc_sect_psymtab (mapped_pc, section);
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if (pst)
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{
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/* Need to read the symbols to get a good value for the end address. */
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if (endaddr != NULL && !pst->readin)
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{
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/* Need to get the terminal in case symbol-reading produces
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output. */
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target_terminal_ours_for_output ();
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PSYMTAB_TO_SYMTAB (pst);
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}
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if (pst->readin)
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{
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/* Checking whether the msymbol has a larger value is for the
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"pathological" case mentioned in print_frame_info. */
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f = find_pc_sect_function (mapped_pc, section);
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if (f != NULL
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&& (msymbol == NULL
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|| (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
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>= SYMBOL_VALUE_ADDRESS (msymbol))))
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{
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cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
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cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
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cache_pc_function_name = DEPRECATED_SYMBOL_NAME (f);
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cache_pc_function_section = section;
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goto return_cached_value;
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}
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}
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else
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{
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/* Now that static symbols go in the minimal symbol table, perhaps
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we could just ignore the partial symbols. But at least for now
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we use the partial or minimal symbol, whichever is larger. */
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psb = find_pc_sect_psymbol (pst, mapped_pc, section);
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if (psb
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&& (msymbol == NULL ||
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(SYMBOL_VALUE_ADDRESS (psb)
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>= SYMBOL_VALUE_ADDRESS (msymbol))))
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{
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/* This case isn't being cached currently. */
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if (address)
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*address = SYMBOL_VALUE_ADDRESS (psb);
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if (name)
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*name = DEPRECATED_SYMBOL_NAME (psb);
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/* endaddr non-NULL can't happen here. */
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return 1;
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}
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}
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}
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/* Not in the normal symbol tables, see if the pc is in a known section.
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If it's not, then give up. This ensures that anything beyond the end
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of the text seg doesn't appear to be part of the last function in the
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text segment. */
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osect = find_pc_sect_section (mapped_pc, section);
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if (!osect)
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msymbol = NULL;
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/* Must be in the minimal symbol table. */
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if (msymbol == NULL)
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{
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/* No available symbol. */
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if (name != NULL)
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*name = 0;
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if (address != NULL)
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*address = 0;
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if (endaddr != NULL)
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*endaddr = 0;
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return 0;
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}
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cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
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cache_pc_function_name = DEPRECATED_SYMBOL_NAME (msymbol);
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cache_pc_function_section = section;
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/* Use the lesser of the next minimal symbol in the same section, or
|
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the end of the section, as the end of the function. */
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/* Step over other symbols at this same address, and symbols in
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other sections, to find the next symbol in this section with
|
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a different address. */
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for (i = 1; DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL; i++)
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{
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if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol)
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&& SYMBOL_BFD_SECTION (msymbol + i) == SYMBOL_BFD_SECTION (msymbol))
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break;
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}
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|
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if (DEPRECATED_SYMBOL_NAME (msymbol + i) != NULL
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&& SYMBOL_VALUE_ADDRESS (msymbol + i) < osect->endaddr)
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cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i);
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else
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/* We got the start address from the last msymbol in the objfile.
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So the end address is the end of the section. */
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cache_pc_function_high = osect->endaddr;
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return_cached_value:
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|
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if (address)
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{
|
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if (pc_in_unmapped_range (pc, section))
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*address = overlay_unmapped_address (cache_pc_function_low, section);
|
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else
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*address = cache_pc_function_low;
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}
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|
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if (name)
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*name = cache_pc_function_name;
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if (endaddr)
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{
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if (pc_in_unmapped_range (pc, section))
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{
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/* Because the high address is actually beyond the end of
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the function (and therefore possibly beyond the end of
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the overlay), we must actually convert (high - 1) and
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then add one to that. */
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*endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1,
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section);
|
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}
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else
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*endaddr = cache_pc_function_high;
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}
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return 1;
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}
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/* Backward compatibility, no section argument. */
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int
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find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address,
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CORE_ADDR *endaddr)
|
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{
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asection *section;
|
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|
||
section = find_pc_overlay (pc);
|
||
return find_pc_sect_partial_function (pc, section, name, address, endaddr);
|
||
}
|
||
|
||
/* Return the innermost stack frame executing inside of BLOCK,
|
||
or NULL if there is no such frame. If BLOCK is NULL, just return NULL. */
|
||
|
||
struct frame_info *
|
||
block_innermost_frame (struct block *block)
|
||
{
|
||
struct frame_info *frame;
|
||
register CORE_ADDR start;
|
||
register CORE_ADDR end;
|
||
CORE_ADDR calling_pc;
|
||
|
||
if (block == NULL)
|
||
return NULL;
|
||
|
||
start = BLOCK_START (block);
|
||
end = BLOCK_END (block);
|
||
|
||
frame = NULL;
|
||
while (1)
|
||
{
|
||
frame = get_prev_frame (frame);
|
||
if (frame == NULL)
|
||
return NULL;
|
||
calling_pc = get_frame_address_in_block (frame);
|
||
if (calling_pc >= start && calling_pc < end)
|
||
return frame;
|
||
}
|
||
}
|
||
|
||
/* Are we in a call dummy? The code below which allows DECR_PC_AFTER_BREAK
|
||
below is for infrun.c, which may give the macro a pc without that
|
||
subtracted out. */
|
||
|
||
/* Is the PC in a call dummy? SP and FRAME_ADDRESS are the bottom and
|
||
top of the stack frame which we are checking, where "bottom" and
|
||
"top" refer to some section of memory which contains the code for
|
||
the call dummy. Calls to this macro assume that the contents of
|
||
SP_REGNUM and DEPRECATED_FP_REGNUM (or the saved values thereof),
|
||
respectively, are the things to pass.
|
||
|
||
This won't work on the 29k, where SP_REGNUM and
|
||
DEPRECATED_FP_REGNUM don't have that meaning, but the 29k doesn't
|
||
use ON_STACK. This could be fixed by generalizing this scheme,
|
||
perhaps by passing in a frame and adding a few fields, at least on
|
||
machines which need them for DEPRECATED_PC_IN_CALL_DUMMY.
|
||
|
||
Something simpler, like checking for the stack segment, doesn't work,
|
||
since various programs (threads implementations, gcc nested function
|
||
stubs, etc) may either allocate stack frames in another segment, or
|
||
allocate other kinds of code on the stack. */
|
||
|
||
int
|
||
deprecated_pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp,
|
||
CORE_ADDR frame_address)
|
||
{
|
||
return (INNER_THAN ((sp), (pc))
|
||
&& (frame_address != 0)
|
||
&& INNER_THAN ((pc), (frame_address)));
|
||
}
|
||
|
||
int
|
||
deprecated_pc_in_call_dummy_at_entry_point (CORE_ADDR pc, CORE_ADDR sp,
|
||
CORE_ADDR frame_address)
|
||
{
|
||
return ((pc) >= CALL_DUMMY_ADDRESS ()
|
||
&& (pc) <= (CALL_DUMMY_ADDRESS () + DECR_PC_AFTER_BREAK));
|
||
}
|
||
|
||
/* Returns true for a user frame or a call_function_by_hand dummy
|
||
frame, and false for the CRT0 start-up frame. Purpose is to
|
||
terminate backtrace. */
|
||
|
||
int
|
||
legacy_frame_chain_valid (CORE_ADDR fp, struct frame_info *fi)
|
||
{
|
||
/* Don't prune CALL_DUMMY frames. */
|
||
if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
|
||
&& DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0))
|
||
return 1;
|
||
|
||
/* If the new frame pointer is zero, then it isn't valid. */
|
||
if (fp == 0)
|
||
return 0;
|
||
|
||
/* If the new frame would be inside (younger than) the previous frame,
|
||
then it isn't valid. */
|
||
if (INNER_THAN (fp, get_frame_base (fi)))
|
||
return 0;
|
||
|
||
/* If the architecture has a custom DEPRECATED_FRAME_CHAIN_VALID,
|
||
call it now. */
|
||
if (DEPRECATED_FRAME_CHAIN_VALID_P ())
|
||
return DEPRECATED_FRAME_CHAIN_VALID (fp, fi);
|
||
|
||
/* If we're already inside the entry function for the main objfile, then it
|
||
isn't valid. */
|
||
if (inside_entry_func (get_frame_pc (fi)))
|
||
return 0;
|
||
|
||
/* If we're inside the entry file, it isn't valid. */
|
||
/* NOTE/drow 2002-12-25: should there be a way to disable this check? It
|
||
assumes a single small entry file, and the way some debug readers (e.g.
|
||
dbxread) figure out which object is the entry file is somewhat hokey. */
|
||
if (inside_entry_file (frame_pc_unwind (fi)))
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|