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* blockframe.c (find_pc_partial_function): Use the minimal symbol
size to control the cache entry, if available. * minsyms.c (lookup_minimal_symbol_by_pc_section): Handle minimal symbols with zero and non-zero sizes differently. * gdb.arch/i386-size.c, gdb.arch/i386-size.exp: New files.
This commit is contained in:
Daniel Jacobowitz
parent
5061a8853b
commit
29e8a84408
@ -1,3 +1,10 @@
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2006-07-18 Daniel Jacobowitz <dan@codesourcery.com>
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* blockframe.c (find_pc_partial_function): Use the minimal symbol
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size to control the cache entry, if available.
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* minsyms.c (lookup_minimal_symbol_by_pc_section): Handle minimal
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symbols with zero and non-zero sizes differently.
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2006-07-18 Daniel Jacobowitz <dan@codesourcery.com>
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* linux-thread-db.c (td_thr_getfpregs_p, td_thr_getgregs_p)
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@ -280,27 +280,34 @@ find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address,
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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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/* If the minimal symbol has a size, use it for the cache.
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Otherwise 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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/* 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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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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if (MSYMBOL_SIZE (msymbol) != 0)
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cache_pc_function_high = cache_pc_function_low + MSYMBOL_SIZE (msymbol);
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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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{
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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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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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}
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return_cached_value:
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107
gdb/minsyms.c
107
gdb/minsyms.c
@ -412,6 +412,8 @@ lookup_minimal_symbol_by_pc_section (CORE_ADDR pc, asection *section)
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if (objfile->minimal_symbol_count > 0)
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{
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int best_zero_sized = -1;
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msymbol = objfile->msymbols;
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lo = 0;
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hi = objfile->minimal_symbol_count - 1;
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@ -461,34 +463,91 @@ lookup_minimal_symbol_by_pc_section (CORE_ADDR pc, asection *section)
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== SYMBOL_VALUE_ADDRESS (&msymbol[hi + 1])))
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hi++;
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/* Skip various undesirable symbols. */
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while (hi >= 0)
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{
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/* Skip any absolute symbols. This is apparently
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what adb and dbx do, and is needed for the CM-5.
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There are two known possible problems: (1) on
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ELF, apparently end, edata, etc. are absolute.
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Not sure ignoring them here is a big deal, but if
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we want to use them, the fix would go in
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elfread.c. (2) I think shared library entry
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points on the NeXT are absolute. If we want
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special handling for this it probably should be
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triggered by a special mst_abs_or_lib or some
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such. */
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if (msymbol[hi].type == mst_abs)
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{
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hi--;
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continue;
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}
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/* If SECTION was specified, skip any symbol from
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wrong section. */
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if (section
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/* Some types of debug info, such as COFF,
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don't fill the bfd_section member, so don't
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throw away symbols on those platforms. */
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&& SYMBOL_BFD_SECTION (&msymbol[hi]) != NULL
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&& SYMBOL_BFD_SECTION (&msymbol[hi]) != section)
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{
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hi--;
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continue;
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}
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/* If the minimal symbol has a zero size, save it
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but keep scanning backwards looking for one with
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a non-zero size. A zero size may mean that the
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symbol isn't an object or function (e.g. a
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label), or it may just mean that the size was not
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specified. */
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if (MSYMBOL_SIZE (&msymbol[hi]) == 0
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&& best_zero_sized == -1)
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{
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best_zero_sized = hi;
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hi--;
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continue;
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}
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/* Otherwise, this symbol must be as good as we're going
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to get. */
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break;
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}
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/* If HI has a zero size, and best_zero_sized is set,
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then we had two or more zero-sized symbols; prefer
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the first one we found (which may have a higher
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address). Also, if we ran off the end, be sure
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to back up. */
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if (best_zero_sized != -1
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&& (hi < 0 || MSYMBOL_SIZE (&msymbol[hi]) == 0))
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hi = best_zero_sized;
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/* If the minimal symbol has a non-zero size, and this
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PC appears to be outside the symbol's contents, then
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refuse to use this symbol. If we found a zero-sized
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symbol with an address greater than this symbol's,
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use that instead. We assume that if symbols have
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specified sizes, they do not overlap. */
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if (hi >= 0
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&& MSYMBOL_SIZE (&msymbol[hi]) != 0
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&& pc >= (SYMBOL_VALUE_ADDRESS (&msymbol[hi])
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+ MSYMBOL_SIZE (&msymbol[hi])))
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{
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if (best_zero_sized != -1)
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hi = best_zero_sized;
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else
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/* Go on to the next object file. */
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continue;
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}
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/* The minimal symbol indexed by hi now is the best one in this
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objfile's minimal symbol table. See if it is the best one
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overall. */
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/* Skip any absolute symbols. This is apparently what adb
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and dbx do, and is needed for the CM-5. There are two
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known possible problems: (1) on ELF, apparently end, edata,
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etc. are absolute. Not sure ignoring them here is a big
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deal, but if we want to use them, the fix would go in
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elfread.c. (2) I think shared library entry points on the
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NeXT are absolute. If we want special handling for this
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it probably should be triggered by a special
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mst_abs_or_lib or some such. */
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while (hi >= 0
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&& msymbol[hi].type == mst_abs)
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--hi;
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/* If "section" specified, skip any symbol from wrong section */
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/* This is the new code that distinguishes it from the old function */
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if (section)
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while (hi >= 0
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/* Some types of debug info, such as COFF,
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don't fill the bfd_section member, so don't
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throw away symbols on those platforms. */
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&& SYMBOL_BFD_SECTION (&msymbol[hi]) != NULL
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&& SYMBOL_BFD_SECTION (&msymbol[hi]) != section)
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--hi;
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if (hi >= 0
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&& ((best_symbol == NULL) ||
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(SYMBOL_VALUE_ADDRESS (best_symbol) <
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@ -1,3 +1,7 @@
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2006-07-18 Daniel Jacobowitz <dan@codesourcery.com>
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* gdb.arch/i386-size.c, gdb.arch/i386-size.exp: New files.
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2006-07-18 Daniel Jacobowitz <dan@codesourcery.com>
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* gdb.threads/print-threads.exp: Use gdb_breakpoint.
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50
gdb/testsuite/gdb.arch/i386-size.c
Normal file
50
gdb/testsuite/gdb.arch/i386-size.c
Normal file
@ -0,0 +1,50 @@
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/* Symbol size test program.
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Copyright 2006 Free Software 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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#ifdef SYMBOL_PREFIX
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#define SYMBOL(str) SYMBOL_PREFIX #str
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#else
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#define SYMBOL(str) #str
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#endif
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void
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trap (void)
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{
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asm ("int $0x03");
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}
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/* Jump from a function with its symbol size set, to a function
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named by a local label. If GDB does not look at the sizes of
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symbols, we will still appear to be in the first function. */
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asm(".text\n"
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" .align 8\n"
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" .globl " SYMBOL (main) "\n"
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SYMBOL (main) ":\n"
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" pushl %ebp\n"
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" mov %esp, %ebp\n"
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" call .Lfunc\n"
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" ret\n"
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" .size " SYMBOL (main) ", .-" SYMBOL (main) "\n"
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".Lfunc:\n"
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" pushl %ebp\n"
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" mov %esp, %ebp\n"
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" call " SYMBOL (trap) "\n");
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89
gdb/testsuite/gdb.arch/i386-size.exp
Normal file
89
gdb/testsuite/gdb.arch/i386-size.exp
Normal file
@ -0,0 +1,89 @@
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# Copyright 2006 Free Software Foundation, Inc.
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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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#
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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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#
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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, Boston, MA 02111-1307, USA.
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# Please email any bugs, comments, and/or additions to this file to:
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# bug-gdb@gnu.org
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# This file is part of the gdb testsuite.
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if $tracelevel {
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strace $tracelevel
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}
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# Test that GDB can see the sizes of symbols.
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if ![istarget "i?86-*-*"] then {
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verbose "Skipping i386 unwinder tests."
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return
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}
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set testfile "i386-size"
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set srcfile ${testfile}.c
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set binfile ${objdir}/${subdir}/${testfile}
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# some targets have leading underscores on assembly symbols.
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# TODO: detect this automatically
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set additional_flags ""
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if [istarget "i?86-*-cygwin*"] then {
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set additional_flags "additional_flags=-DSYMBOL_PREFIX=\"_\""
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}
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if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
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executable [list debug $additional_flags]] != "" } {
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untested "i386-size"
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return -1
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}
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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# We use gdb_run_cmd so this stands a chance to work for remote
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# targets too.
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gdb_run_cmd
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gdb_expect {
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-re "Program received signal SIGTRAP.*$gdb_prompt $" {
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pass "run past main"
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}
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-re ".*$gdb_prompt $" {
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fail "run past main"
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}
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timeout {
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fail "run past main (timeout)"
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}
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}
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set message "backtrace shows no function"
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gdb_test_multiple "backtrace 10" $message {
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-re "#1\[ \t]*$hex in main.*$gdb_prompt $" {
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fail $message
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}
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-re "#1\[ \t]*$hex in \\?\\? \\(\\).*$gdb_prompt $" {
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pass $message
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}
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}
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set message "disassemble stops at end of main"
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gdb_test_multiple "disassemble main" $message {
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-re "call.*<trap>.*$gdb_prompt $" {
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fail $message
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}
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-re "<main\\+8>:\[ \t\]+ret\[ \t\r\n\]+End of.*$gdb_prompt $" {
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pass $message
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}
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}
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