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https://github.com/darlinghq/darling-gdb.git
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2e4964adfc
* defs.h (demangle_and_match): Remove prototype. * dwarfread.c (STREQ, STREQN): Remove macros, replaced with STREQ and STREQN defined in defs.h. * dwarfread.c (set_cu_language): For completely unknown languages, try to deduce the language from the filename. Retain behavior that for known languages we don't know how to handle, we use language_unknown. * dwarfread.c (enum_type, symthesize_typedef): Initialize language and demangled name fields in symbol. * dwarfread.c, mipsread.c, partial-stab.h: For all usages of ADD_PSYMBOL_TO_LIST, add language and objfile parameters. * dwarfread.c (new_symbol): Attempt to demangle C++ symbol names and cache the results in SYMBOL_DEMANGLED_NAME for the symbol. * elfread.c (STREQ): Remove macro, use STREQ defined in defs.h. Replace usages throughout. * elfread.c (demangle.h): Include. * elfread.c (record_minimal_symbol): Remove prototype and function. * gdbtypes.h, symtab.h (B_SET, B_CLR, B_TST, B_TYPE, B_BYTES, B_CLRALL): Moved from symtab.h to gdbtypes.h. * infcmd.c (jump_command): Remove code to demangle name and add it to a cleanup list. Now just use SYMBOL_DEMANGLED_NAME. * minsyms.c (demangle.h): Include. * minsyms.c (lookup_minimal_symbol): Indent comment to match code. * minsyms.c (install_minimal_symbols): Attempt to demangle symbol names as C++ names, and cache them in SYMBOL_DEMANGLED_NAME. * mipsread.c (psymtab_language): Add static variable. * stabsread.c (demangle.h): Include. * stabsread.c (define_symbol): Attempt to demangle C++ symbol names and cache them in the SYMBOL_DEMANGLED_NAME field. * stack.c (return_command): Remove explicit demangling of name and use of cleanups. Just use SYMBOL_DEMANGLED_NAME. * symfile.c (demangle.h): Include. * symfile.c (add_psymbol_to_list, add_psymbol_addr_to_list): Fix to match macros in symfile.h and allow them to be compiled if INLINE_ADD_PSYMBOL is not true. * symfile.h (INLINE_ADD_PSYMBOL): Default to true if not set. * symfile.h (ADD_PSYMBOL_*): Add language and objfile parameters. Add code to demangle and cache C++ symbol names. Use macro form if INLINE_ADD_PSYMBOL is true, otherwise use C function form. * symmisc.c (add_psymbol_to_list, add_psymbol_addr_to_list): Remove, also defined in symfile.c, which we already fixed. * symtab.c (expensive_mangler): Remove prototype and function. * symtab.c (find_methods): Remove physnames parameter and fix prototype to match. * symtab.c (completion_list_add_symbol): Name changed to completion_list_add_name. * symtab.c (COMPLETION_LIST_ADD_SYMBOL): New macro, adds both the normal symbol name and the cached C++ demangled name. * symtab.c (lookup_demangled_partial_symbol, lookup_demangled_block_symbol): Remove prototypes and functions. * symtab.c (lookup_symbol): Remove use of expensive_mangler, use lookup_block_symbol instead of lookup_demangled_block_symbol. Remove code to try demangling names and matching them. * symtab.c (lookup_partial_symbol, lookup_block_symbol): Fix to try matching the cached demangled name if no match is found using the regular symbol name. * symtab.c (find_methods): Remove unused physnames array. * symtab.c (name_match, NAME_MATCH): Remove function and macro, replaced with SYMBOL_MATCHES_REGEXP from symtab.h. * symtab.c (completion_list_add_symbol): Rewrite to use cached C++ demangled symbol names. * symtab.h: Much reformatting of structures and such to add whitespace to make them more readable, and make them more consistent with other gdb structure definitions. * symtab.h (general_symbol_info): New struct containing fields common to all symbols. * symtab.h (SYMBOL_LANGUAGE, SYMBOL_DEMANGLED_NAME, SYMBOL_SOURCE_NAME, SYMBOL_LINKAGE_NAME, SYMBOL_MATCHES_NAME, SYMBOL_MATCHES_REGEXP, MSYMBOL_INFO, MSYMBOL_TYPE): New macros. * symtab. (struct minimal_symbol, struct partial_symbol, struct symbol): Use general_symbol_info struct. * utils.c (demangle_and_match): Remove, no longer used. * valops.c (demangle.h): Include. * xcoffexec.c (eq): Remove macro, replace usages with STREQ. * blockframe.c, breakpoint.c, c-exp.y, c-valprint.c, dbxread.c, infcmd.c, m2-exp.y, minsyms.c, objfiles.h, solib.c, stack.c, symmisc.c, symtab.c, valops.c: Replace references to minimal symbol fields with appropriate macros. * breakpoint.c, buildsym.c, c-exp.y, c-typeprint.c, c-valprint.c, coffread.c, command.c, convex-tdep.c, cp-valprint.c, dbxread.c, demangle.c, elfread.c, energize.c, environ.c, exec.c, gdbtypes.c, i960-tdep.c, infrun.c, infrun-hacked.c, language.c, main.c, minsyms.c, mipsread.c, partial-stab.h, remote-es1800.c, remote-nindy.c, remote-udi.c, rs6000-tdep.c, solib.c, source.c, sparc-pinsn.c, stabsread.c, standalone.c, state.c, stuff.c, symfile.c, symmisc.c, symtab.c, symtab.h, tm-sysv4.h, tm-ultra3.h, values.c, xcoffexec.c, xcoffread.c: Replace strcmp and strncmp usages with STREQ, STREQN, or STRCMP as appropriate. * breakpoint.c, buildsym.c, c-typeprint.c, expprint.c, findvar.c, mipsread.c, printcmd.c, source.c, stabsread.c, stack.c, symmisc.c, tm-29k.h, valops.c, values.c: Replace SYMBOL_NAME references with SYMBOL_SOURCE_NAME or SYMBOL_LINKAGE_NAME as appropriate. * buildsym.c (start_subfile, patch_subfile_names): Default the source language to what can be deduced from the filename. * buildsym.c (end_symtab): Update the source language in the allocated symtab to match what we have been using. * buildsym.h (struct subfile): Add a language field. * c-typeprint.c (c_print_type): Remove code to do explicit demangling. * dbxread.c (psymtab_language): Add static variable. * dbxread.c (start_psymtab): Initialize psymtab_language using deduce_language_from_filename.
1283 lines
34 KiB
C
1283 lines
34 KiB
C
/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
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Copyright 1990, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include <sys/types.h>
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#include <signal.h>
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#include <string.h>
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#include <link.h>
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#include <sys/param.h>
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#include <fcntl.h>
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#ifndef SVR4_SHARED_LIBS
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/* SunOS shared libs need the nlist structure. */
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#include <a.out.h>
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#endif
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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 "gdbcore.h"
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#include "command.h"
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#include "target.h"
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#include "frame.h"
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#include "regex.h"
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#include "inferior.h"
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#define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */
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/* On SVR4 systems, for the initial implementation, use main() as the
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"startup mapping complete" breakpoint address. The models for SunOS
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and SVR4 dynamic linking debugger support are different in that SunOS
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hits one breakpoint when all mapping is complete while using the SVR4
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debugger support takes two breakpoint hits for each file mapped, and
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there is no way to know when the "last" one is hit. Both these
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mechanisms should be tied to a "breakpoint service routine" that
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gets automatically executed whenever one of the breakpoints indicating
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a change in mapping is hit. This is a future enhancement. (FIXME) */
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#define BKPT_AT_MAIN 1
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/* local data declarations */
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#ifndef SVR4_SHARED_LIBS
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#define DEBUG_BASE "_DYNAMIC"
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#define LM_ADDR(so) ((so) -> lm.lm_addr)
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#define LM_NEXT(so) ((so) -> lm.lm_next)
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#define LM_NAME(so) ((so) -> lm.lm_name)
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static struct link_dynamic dynamic_copy;
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static struct link_dynamic_2 ld_2_copy;
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static struct ld_debug debug_copy;
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static CORE_ADDR debug_addr;
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static CORE_ADDR flag_addr;
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#else /* SVR4_SHARED_LIBS */
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#define DEBUG_BASE "_r_debug"
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#define LM_ADDR(so) ((so) -> lm.l_addr)
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#define LM_NEXT(so) ((so) -> lm.l_next)
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#define LM_NAME(so) ((so) -> lm.l_name)
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static struct r_debug debug_copy;
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char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
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#endif /* !SVR4_SHARED_LIBS */
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struct so_list {
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struct so_list *next; /* next structure in linked list */
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struct link_map lm; /* copy of link map from inferior */
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struct link_map *lmaddr; /* addr in inferior lm was read from */
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CORE_ADDR lmend; /* upper addr bound of mapped object */
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char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */
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char symbols_loaded; /* flag: symbols read in yet? */
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char from_tty; /* flag: print msgs? */
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struct objfile *objfile; /* objfile for loaded lib */
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struct section_table *sections;
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struct section_table *sections_end;
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struct section_table *textsection;
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};
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static struct so_list *so_list_head; /* List of known shared objects */
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static CORE_ADDR debug_base; /* Base of dynamic linker structures */
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static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
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extern int
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fdmatch PARAMS ((int, int)); /* In libiberty */
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/* Local function prototypes */
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static void
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special_symbol_handling PARAMS ((struct so_list *));
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static void
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sharedlibrary_command PARAMS ((char *, int));
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static int
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enable_break PARAMS ((void));
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static int
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disable_break PARAMS ((void));
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static void
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info_sharedlibrary_command PARAMS ((char *, int));
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static int
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symbol_add_stub PARAMS ((char *));
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static struct so_list *
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find_solib PARAMS ((struct so_list *));
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static struct link_map *
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first_link_map_member PARAMS ((void));
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static CORE_ADDR
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locate_base PARAMS ((void));
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static void
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solib_map_sections PARAMS ((struct so_list *));
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#ifdef SVR4_SHARED_LIBS
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static int
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look_for_base PARAMS ((int, CORE_ADDR));
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static CORE_ADDR
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bfd_lookup_symbol PARAMS ((bfd *, char *));
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#else
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static void
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solib_add_common_symbols PARAMS ((struct rtc_symb *, struct objfile *));
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#endif
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/*
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LOCAL FUNCTION
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solib_map_sections -- open bfd and build sections for shared lib
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SYNOPSIS
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static void solib_map_sections (struct so_list *so)
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DESCRIPTION
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Given a pointer to one of the shared objects in our list
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of mapped objects, use the recorded name to open a bfd
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descriptor for the object, build a section table, and then
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relocate all the section addresses by the base address at
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which the shared object was mapped.
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FIXMES
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In most (all?) cases the shared object file name recorded in the
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dynamic linkage tables will be a fully qualified pathname. For
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cases where it isn't, do we really mimic the systems search
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mechanism correctly in the below code (particularly the tilde
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expansion stuff?).
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*/
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static void
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solib_map_sections (so)
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struct so_list *so;
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{
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char *filename;
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char *scratch_pathname;
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int scratch_chan;
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struct section_table *p;
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struct cleanup *old_chain;
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bfd *abfd;
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filename = tilde_expand (so -> so_name);
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old_chain = make_cleanup (free, filename);
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scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
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&scratch_pathname);
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if (scratch_chan < 0)
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{
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scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
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O_RDONLY, 0, &scratch_pathname);
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}
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if (scratch_chan < 0)
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{
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perror_with_name (filename);
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}
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make_cleanup (free, scratch_pathname);
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abfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan);
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if (!abfd)
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{
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close (scratch_chan);
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error ("Could not open `%s' as an executable file: %s",
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scratch_pathname, bfd_errmsg (bfd_error));
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}
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make_cleanup (bfd_close, abfd); /* Zap bfd, close scratch_chan. */
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if (!bfd_check_format (abfd, bfd_object))
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{
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error ("\"%s\": not in executable format: %s.",
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scratch_pathname, bfd_errmsg (bfd_error));
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}
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if (build_section_table (abfd, &so -> sections, &so -> sections_end))
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{
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error ("Can't find the file sections in `%s': %s",
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exec_bfd -> filename, bfd_errmsg (bfd_error));
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}
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for (p = so -> sections; p < so -> sections_end; p++)
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{
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/* Relocate the section binding addresses as recorded in the shared
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object's file by the base address to which the object was actually
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mapped. */
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p -> addr += (CORE_ADDR) LM_ADDR (so);
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p -> endaddr += (CORE_ADDR) LM_ADDR (so);
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so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
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if (STREQ (p -> sec_ptr -> name, ".text"))
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{
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so -> textsection = p;
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}
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}
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/* Free the file names, close the file now. */
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do_cleanups (old_chain);
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}
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/* Read all dynamically loaded common symbol definitions from the inferior
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and add them to the minimal symbol table for the shared library objfile. */
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#ifndef SVR4_SHARED_LIBS
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static void
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solib_add_common_symbols (rtc_symp, objfile)
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struct rtc_symb *rtc_symp;
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struct objfile *objfile;
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{
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struct rtc_symb inferior_rtc_symb;
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struct nlist inferior_rtc_nlist;
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int len;
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char *name;
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char *origname;
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init_minimal_symbol_collection ();
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make_cleanup (discard_minimal_symbols, 0);
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while (rtc_symp)
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{
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read_memory ((CORE_ADDR) rtc_symp,
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(char *) &inferior_rtc_symb,
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sizeof (inferior_rtc_symb));
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read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp,
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(char *) &inferior_rtc_nlist,
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sizeof(inferior_rtc_nlist));
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if (inferior_rtc_nlist.n_type == N_COMM)
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{
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/* FIXME: The length of the symbol name is not available, but in the
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current implementation the common symbol is allocated immediately
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behind the name of the symbol. */
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len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
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origname = name = xmalloc (len);
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read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len);
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/* Don't enter the symbol twice if the target is re-run. */
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if (name[0] == bfd_get_symbol_leading_char (objfile->obfd))
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{
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name++;
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}
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/* FIXME: Do we really want to exclude symbols which happen
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to match symbols for other locations in the inferior's
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address space, even when they are in different linkage units? */
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if (lookup_minimal_symbol (name, (struct objfile *) NULL) == NULL)
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{
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name = obsavestring (name, strlen (name),
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&objfile -> symbol_obstack);
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prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
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mst_bss);
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}
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free (origname);
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}
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rtc_symp = inferior_rtc_symb.rtc_next;
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}
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/* Install any minimal symbols that have been collected as the current
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minimal symbols for this objfile. */
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install_minimal_symbols (objfile);
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}
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#endif /* SVR4_SHARED_LIBS */
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#ifdef SVR4_SHARED_LIBS
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/*
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LOCAL FUNCTION
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bfd_lookup_symbol -- lookup the value for a specific symbol
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SYNOPSIS
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CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
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DESCRIPTION
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An expensive way to lookup the value of a single symbol for
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bfd's that are only temporary anyway. This is used by the
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shared library support to find the address of the debugger
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interface structures in the shared library.
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Note that 0 is specifically allowed as an error return (no
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such symbol).
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FIXME: See if there is a less "expensive" way of doing this.
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Also see if there is already another bfd or gdb function
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that specifically does this, and if so, use it.
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*/
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static CORE_ADDR
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bfd_lookup_symbol (abfd, symname)
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bfd *abfd;
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char *symname;
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{
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unsigned int storage_needed;
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asymbol *sym;
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asymbol **symbol_table;
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unsigned int number_of_symbols;
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unsigned int i;
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struct cleanup *back_to;
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CORE_ADDR symaddr = 0;
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storage_needed = get_symtab_upper_bound (abfd);
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if (storage_needed > 0)
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{
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symbol_table = (asymbol **) xmalloc (storage_needed);
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back_to = make_cleanup (free, (PTR)symbol_table);
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number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
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for (i = 0; i < number_of_symbols; i++)
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{
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sym = *symbol_table++;
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if (STREQ (sym -> name, symname))
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{
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symaddr = sym -> value;
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break;
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}
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}
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do_cleanups (back_to);
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}
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return (symaddr);
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}
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/*
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LOCAL FUNCTION
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look_for_base -- examine file for each mapped address segment
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SYNOPSYS
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static int look_for_base (int fd, CORE_ADDR baseaddr)
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DESCRIPTION
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This function is passed to proc_iterate_over_mappings, which
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causes it to get called once for each mapped address space, with
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an open file descriptor for the file mapped to that space, and the
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base address of that mapped space.
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Our job is to find the symbol DEBUG_BASE in the file that this
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fd is open on, if it exists, and if so, initialize the dynamic
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linker structure base address debug_base.
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Note that this is a computationally expensive proposition, since
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we basically have to open a bfd on every call, so we specifically
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avoid opening the exec file.
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*/
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static int
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look_for_base (fd, baseaddr)
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int fd;
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CORE_ADDR baseaddr;
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{
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bfd *interp_bfd;
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CORE_ADDR address;
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/* If the fd is -1, then there is no file that corresponds to this
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mapped memory segment, so skip it. Also, if the fd corresponds
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to the exec file, skip it as well. */
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if ((fd == -1) || fdmatch (fileno ((FILE *)(exec_bfd -> iostream)), fd))
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{
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return (0);
|
|
}
|
|
|
|
/* Try to open whatever random file this fd corresponds to. Note that
|
|
we have no way currently to find the filename. Don't gripe about
|
|
any problems we might have, just fail. */
|
|
|
|
if ((interp_bfd = bfd_fdopenr ("unnamed", NULL, fd)) == NULL)
|
|
{
|
|
return (0);
|
|
}
|
|
if (!bfd_check_format (interp_bfd, bfd_object))
|
|
{
|
|
bfd_close (interp_bfd);
|
|
return (0);
|
|
}
|
|
|
|
/* Now try to find our DEBUG_BASE symbol in this file, which we at
|
|
least know to be a valid ELF executable or shared library. */
|
|
|
|
if ((address = bfd_lookup_symbol (interp_bfd, DEBUG_BASE)) == 0)
|
|
{
|
|
bfd_close (interp_bfd);
|
|
return (0);
|
|
}
|
|
|
|
/* Eureka! We found the symbol. But now we may need to relocate it
|
|
by the base address. If the symbol's value is less than the base
|
|
address of the shared library, then it hasn't yet been relocated
|
|
by the dynamic linker, and we have to do it ourself. FIXME: Note
|
|
that we make the assumption that the first segment that corresponds
|
|
to the shared library has the base address to which the library
|
|
was relocated. */
|
|
|
|
if (address < baseaddr)
|
|
{
|
|
address += baseaddr;
|
|
}
|
|
debug_base = address;
|
|
bfd_close (interp_bfd);
|
|
return (1);
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
locate_base -- locate the base address of dynamic linker structs
|
|
|
|
SYNOPSIS
|
|
|
|
CORE_ADDR locate_base (void)
|
|
|
|
DESCRIPTION
|
|
|
|
For both the SunOS and SVR4 shared library implementations, if the
|
|
inferior executable has been linked dynamically, there is a single
|
|
address somewhere in the inferior's data space which is the key to
|
|
locating all of the dynamic linker's runtime structures. This
|
|
address is the value of the symbol defined by the macro DEBUG_BASE.
|
|
The job of this function is to find and return that address, or to
|
|
return 0 if there is no such address (the executable is statically
|
|
linked for example).
|
|
|
|
For SunOS, the job is almost trivial, since the dynamic linker and
|
|
all of it's structures are statically linked to the executable at
|
|
link time. Thus the symbol for the address we are looking for has
|
|
already been added to the minimal symbol table for the executable's
|
|
objfile at the time the symbol file's symbols were read, and all we
|
|
have to do is look it up there. Note that we explicitly do NOT want
|
|
to find the copies in the shared library.
|
|
|
|
The SVR4 version is much more complicated because the dynamic linker
|
|
and it's structures are located in the shared C library, which gets
|
|
run as the executable's "interpreter" by the kernel. We have to go
|
|
to a lot more work to discover the address of DEBUG_BASE. Because
|
|
of this complexity, we cache the value we find and return that value
|
|
on subsequent invocations. Note there is no copy in the executable
|
|
symbol tables.
|
|
|
|
Note that we can assume nothing about the process state at the time
|
|
we need to find this address. We may be stopped on the first instruc-
|
|
tion of the interpreter (C shared library), the first instruction of
|
|
the executable itself, or somewhere else entirely (if we attached
|
|
to the process for example).
|
|
|
|
*/
|
|
|
|
static CORE_ADDR
|
|
locate_base ()
|
|
{
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
struct minimal_symbol *msymbol;
|
|
CORE_ADDR address = 0;
|
|
|
|
/* For SunOS, we want to limit the search for DEBUG_BASE to the executable
|
|
being debugged, since there is a duplicate named symbol in the shared
|
|
library. We don't want the shared library versions. */
|
|
|
|
msymbol = lookup_minimal_symbol (DEBUG_BASE, symfile_objfile);
|
|
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
|
|
{
|
|
address = SYMBOL_VALUE_ADDRESS (msymbol);
|
|
}
|
|
return (address);
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
/* Check to see if we have a currently valid address, and if so, avoid
|
|
doing all this work again and just return the cached address. If
|
|
we have no cached address, ask the /proc support interface to iterate
|
|
over the list of mapped address segments, calling look_for_base() for
|
|
each segment. When we are done, we will have either found the base
|
|
address or not. */
|
|
|
|
if (debug_base == 0)
|
|
{
|
|
proc_iterate_over_mappings (look_for_base);
|
|
}
|
|
return (debug_base);
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
}
|
|
|
|
static struct link_map *
|
|
first_link_map_member ()
|
|
{
|
|
struct link_map *lm = NULL;
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy));
|
|
if (dynamic_copy.ld_version >= 2)
|
|
{
|
|
/* It is a version that we can deal with, so read in the secondary
|
|
structure and find the address of the link map list from it. */
|
|
read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy,
|
|
sizeof (struct link_dynamic_2));
|
|
lm = ld_2_copy.ld_loaded;
|
|
}
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug));
|
|
lm = debug_copy.r_map;
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
return (lm);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
find_solib -- step through list of shared objects
|
|
|
|
SYNOPSIS
|
|
|
|
struct so_list *find_solib (struct so_list *so_list_ptr)
|
|
|
|
DESCRIPTION
|
|
|
|
This module contains the routine which finds the names of any
|
|
loaded "images" in the current process. The argument in must be
|
|
NULL on the first call, and then the returned value must be passed
|
|
in on subsequent calls. This provides the capability to "step" down
|
|
the list of loaded objects. On the last object, a NULL value is
|
|
returned.
|
|
|
|
The arg and return value are "struct link_map" pointers, as defined
|
|
in <link.h>.
|
|
*/
|
|
|
|
static struct so_list *
|
|
find_solib (so_list_ptr)
|
|
struct so_list *so_list_ptr; /* Last lm or NULL for first one */
|
|
{
|
|
struct so_list *so_list_next = NULL;
|
|
struct link_map *lm = NULL;
|
|
struct so_list *new;
|
|
|
|
if (so_list_ptr == NULL)
|
|
{
|
|
/* We are setting up for a new scan through the loaded images. */
|
|
if ((so_list_next = so_list_head) == NULL)
|
|
{
|
|
/* We have not already read in the dynamic linking structures
|
|
from the inferior, lookup the address of the base structure. */
|
|
debug_base = locate_base ();
|
|
if (debug_base > 0)
|
|
{
|
|
/* Read the base structure in and find the address of the first
|
|
link map list member. */
|
|
lm = first_link_map_member ();
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* We have been called before, and are in the process of walking
|
|
the shared library list. Advance to the next shared object. */
|
|
if ((lm = LM_NEXT (so_list_ptr)) == NULL)
|
|
{
|
|
/* We have hit the end of the list, so check to see if any were
|
|
added, but be quiet if we can't read from the target any more. */
|
|
int status = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr,
|
|
(char *) &(so_list_ptr -> lm),
|
|
sizeof (struct link_map));
|
|
if (status == 0)
|
|
{
|
|
lm = LM_NEXT (so_list_ptr);
|
|
}
|
|
else
|
|
{
|
|
lm = NULL;
|
|
}
|
|
}
|
|
so_list_next = so_list_ptr -> next;
|
|
}
|
|
if ((so_list_next == NULL) && (lm != NULL))
|
|
{
|
|
/* Get next link map structure from inferior image and build a local
|
|
abbreviated load_map structure */
|
|
new = (struct so_list *) xmalloc (sizeof (struct so_list));
|
|
memset ((char *) new, 0, sizeof (struct so_list));
|
|
new -> lmaddr = lm;
|
|
/* Add the new node as the next node in the list, or as the root
|
|
node if this is the first one. */
|
|
if (so_list_ptr != NULL)
|
|
{
|
|
so_list_ptr -> next = new;
|
|
}
|
|
else
|
|
{
|
|
so_list_head = new;
|
|
}
|
|
so_list_next = new;
|
|
read_memory ((CORE_ADDR) lm, (char *) &(new -> lm),
|
|
sizeof (struct link_map));
|
|
/* For the SVR4 version, there is one entry that has no name
|
|
(for the inferior executable) since it is not a shared object. */
|
|
if (LM_NAME (new) != 0)
|
|
{
|
|
if (!target_read_string((CORE_ADDR) LM_NAME (new), new -> so_name,
|
|
MAX_PATH_SIZE - 1))
|
|
error ("find_solib: Can't read pathname for load map\n");
|
|
new -> so_name[MAX_PATH_SIZE - 1] = 0;
|
|
solib_map_sections (new);
|
|
}
|
|
}
|
|
return (so_list_next);
|
|
}
|
|
|
|
/* A small stub to get us past the arg-passing pinhole of catch_errors. */
|
|
|
|
static int
|
|
symbol_add_stub (arg)
|
|
char *arg;
|
|
{
|
|
register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
|
|
|
|
so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
|
|
(unsigned int) so -> textsection -> addr,
|
|
0, 0, 0);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
|
|
|
|
solib_add -- add a shared library file to the symtab and section list
|
|
|
|
SYNOPSIS
|
|
|
|
void solib_add (char *arg_string, int from_tty,
|
|
struct target_ops *target)
|
|
|
|
DESCRIPTION
|
|
|
|
*/
|
|
|
|
void
|
|
solib_add (arg_string, from_tty, target)
|
|
char *arg_string;
|
|
int from_tty;
|
|
struct target_ops *target;
|
|
{
|
|
register struct so_list *so = NULL; /* link map state variable */
|
|
char *re_err;
|
|
int count;
|
|
int old;
|
|
|
|
if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
|
|
{
|
|
error ("Invalid regexp: %s", re_err);
|
|
}
|
|
|
|
/* Getting new symbols may change our opinion about what is
|
|
frameless. */
|
|
reinit_frame_cache ();
|
|
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0] && re_exec (so -> so_name))
|
|
{
|
|
if (so -> symbols_loaded)
|
|
{
|
|
if (from_tty)
|
|
{
|
|
printf ("Symbols already loaded for %s\n", so -> so_name);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
catch_errors (symbol_add_stub, (char *) so,
|
|
"Error while reading shared library symbols:\n");
|
|
|
|
special_symbol_handling (so);
|
|
so -> symbols_loaded = 1;
|
|
so -> from_tty = from_tty;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Now add the shared library sections to the section table of the
|
|
specified target, if any. */
|
|
if (target)
|
|
{
|
|
/* Count how many new section_table entries there are. */
|
|
so = NULL;
|
|
count = 0;
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0])
|
|
{
|
|
count += so -> sections_end - so -> sections;
|
|
}
|
|
}
|
|
|
|
if (count)
|
|
{
|
|
/* Reallocate the target's section table including the new size. */
|
|
if (target -> to_sections)
|
|
{
|
|
old = target -> to_sections_end - target -> to_sections;
|
|
target -> to_sections = (struct section_table *)
|
|
realloc ((char *)target -> to_sections,
|
|
(sizeof (struct section_table)) * (count + old));
|
|
}
|
|
else
|
|
{
|
|
old = 0;
|
|
target -> to_sections = (struct section_table *)
|
|
malloc ((sizeof (struct section_table)) * count);
|
|
}
|
|
target -> to_sections_end = target -> to_sections + (count + old);
|
|
|
|
/* Add these section table entries to the target's table. */
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0])
|
|
{
|
|
count = so -> sections_end - so -> sections;
|
|
memcpy ((char *) (target -> to_sections + old),
|
|
so -> sections,
|
|
(sizeof (struct section_table)) * count);
|
|
old += count;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
info_sharedlibrary_command -- code for "info sharedlibrary"
|
|
|
|
SYNOPSIS
|
|
|
|
static void info_sharedlibrary_command ()
|
|
|
|
DESCRIPTION
|
|
|
|
Walk through the shared library list and print information
|
|
about each attached library.
|
|
*/
|
|
|
|
static void
|
|
info_sharedlibrary_command (ignore, from_tty)
|
|
char *ignore;
|
|
int from_tty;
|
|
{
|
|
register struct so_list *so = NULL; /* link map state variable */
|
|
int header_done = 0;
|
|
|
|
if (exec_bfd == NULL)
|
|
{
|
|
printf ("No exec file.\n");
|
|
return;
|
|
}
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0])
|
|
{
|
|
if (!header_done)
|
|
{
|
|
printf("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
|
|
"Shared Object Library");
|
|
header_done++;
|
|
}
|
|
printf ("%-12s", local_hex_string_custom ((int) LM_ADDR (so), "08"));
|
|
printf ("%-12s", local_hex_string_custom (so -> lmend, "08"));
|
|
printf ("%-12s", so -> symbols_loaded ? "Yes" : "No");
|
|
printf ("%s\n", so -> so_name);
|
|
}
|
|
}
|
|
if (so_list_head == NULL)
|
|
{
|
|
printf ("No shared libraries loaded at this time.\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
|
|
|
|
solib_address -- check to see if an address is in a shared lib
|
|
|
|
SYNOPSIS
|
|
|
|
int solib_address (CORE_ADDR address)
|
|
|
|
DESCRIPTION
|
|
|
|
Provides a hook for other gdb routines to discover whether or
|
|
not a particular address is within the mapped address space of
|
|
a shared library. Any address between the base mapping address
|
|
and the first address beyond the end of the last mapping, is
|
|
considered to be within the shared library address space, for
|
|
our purposes.
|
|
|
|
For example, this routine is called at one point to disable
|
|
breakpoints which are in shared libraries that are not currently
|
|
mapped in.
|
|
*/
|
|
|
|
int
|
|
solib_address (address)
|
|
CORE_ADDR address;
|
|
{
|
|
register struct so_list *so = 0; /* link map state variable */
|
|
|
|
while ((so = find_solib (so)) != NULL)
|
|
{
|
|
if (so -> so_name[0])
|
|
{
|
|
if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
|
|
(address < (CORE_ADDR) so -> lmend))
|
|
{
|
|
return (1);
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* Called by free_all_symtabs */
|
|
|
|
void
|
|
clear_solib()
|
|
{
|
|
struct so_list *next;
|
|
|
|
while (so_list_head)
|
|
{
|
|
if (so_list_head -> sections)
|
|
{
|
|
free ((PTR)so_list_head -> sections);
|
|
}
|
|
next = so_list_head -> next;
|
|
free((PTR)so_list_head);
|
|
so_list_head = next;
|
|
}
|
|
debug_base = 0;
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
disable_break -- remove the "mapping changed" breakpoint
|
|
|
|
SYNOPSIS
|
|
|
|
static int disable_break ()
|
|
|
|
DESCRIPTION
|
|
|
|
Removes the breakpoint that gets hit when the dynamic linker
|
|
completes a mapping change.
|
|
|
|
*/
|
|
|
|
static int
|
|
disable_break ()
|
|
{
|
|
int status = 1;
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
int in_debugger = 0;
|
|
|
|
/* Read the debugger structure from the inferior to retrieve the
|
|
address of the breakpoint and the original contents of the
|
|
breakpoint address. Remove the breakpoint by writing the original
|
|
contents back. */
|
|
|
|
read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy));
|
|
|
|
/* Set `in_debugger' to zero now. */
|
|
|
|
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
|
|
|
|
breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr;
|
|
write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst,
|
|
sizeof (debug_copy.ldd_bp_inst));
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
/* Note that breakpoint address and original contents are in our address
|
|
space, so we just need to write the original contents back. */
|
|
|
|
if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
|
|
{
|
|
status = 0;
|
|
}
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
/* For the SVR4 version, we always know the breakpoint address. For the
|
|
SunOS version we don't know it until the above code is executed.
|
|
Grumble if we are stopped anywhere besides the breakpoint address. */
|
|
|
|
if (stop_pc != breakpoint_addr)
|
|
{
|
|
warning ("stopped at unknown breakpoint while handling shared libraries");
|
|
}
|
|
|
|
return (status);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
enable_break -- arrange for dynamic linker to hit breakpoint
|
|
|
|
SYNOPSIS
|
|
|
|
int enable_break (void)
|
|
|
|
DESCRIPTION
|
|
|
|
Both the SunOS and the SVR4 dynamic linkers have, as part of their
|
|
debugger interface, support for arranging for the inferior to hit
|
|
a breakpoint after mapping in the shared libraries. This function
|
|
enables that breakpoint.
|
|
|
|
For SunOS, there is a special flag location (in_debugger) which we
|
|
set to 1. When the dynamic linker sees this flag set, it will set
|
|
a breakpoint at a location known only to itself, after saving the
|
|
original contents of that place and the breakpoint address itself,
|
|
in it's own internal structures. When we resume the inferior, it
|
|
will eventually take a SIGTRAP when it runs into the breakpoint.
|
|
We handle this (in a different place) by restoring the contents of
|
|
the breakpointed location (which is only known after it stops),
|
|
chasing around to locate the shared libraries that have been
|
|
loaded, then resuming.
|
|
|
|
For SVR4, the debugger interface structure contains a member (r_brk)
|
|
which is statically initialized at the time the shared library is
|
|
built, to the offset of a function (_r_debug_state) which is guaran-
|
|
teed to be called once before mapping in a library, and again when
|
|
the mapping is complete. At the time we are examining this member,
|
|
it contains only the unrelocated offset of the function, so we have
|
|
to do our own relocation. Later, when the dynamic linker actually
|
|
runs, it relocates r_brk to be the actual address of _r_debug_state().
|
|
|
|
The debugger interface structure also contains an enumeration which
|
|
is set to either RT_ADD or RT_DELETE prior to changing the mapping,
|
|
depending upon whether or not the library is being mapped or unmapped,
|
|
and then set to RT_CONSISTENT after the library is mapped/unmapped.
|
|
*/
|
|
|
|
static int
|
|
enable_break ()
|
|
{
|
|
|
|
#ifndef SVR4_SHARED_LIBS
|
|
|
|
int j;
|
|
int in_debugger;
|
|
|
|
/* Get link_dynamic structure */
|
|
|
|
j = target_read_memory (debug_base, (char *) &dynamic_copy,
|
|
sizeof (dynamic_copy));
|
|
if (j)
|
|
{
|
|
/* unreadable */
|
|
return (0);
|
|
}
|
|
|
|
/* Calc address of debugger interface structure */
|
|
|
|
debug_addr = (CORE_ADDR) dynamic_copy.ldd;
|
|
|
|
/* Calc address of `in_debugger' member of debugger interface structure */
|
|
|
|
flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger -
|
|
(char *) &debug_copy);
|
|
|
|
/* Write a value of 1 to this member. */
|
|
|
|
in_debugger = 1;
|
|
|
|
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
|
|
|
|
#else /* SVR4_SHARED_LIBS */
|
|
|
|
#ifdef BKPT_AT_MAIN
|
|
|
|
struct minimal_symbol *msymbol;
|
|
|
|
msymbol = lookup_minimal_symbol ("main", symfile_objfile);
|
|
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
|
|
{
|
|
breakpoint_addr = SYMBOL_VALUE_ADDRESS (msymbol);
|
|
}
|
|
else
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
if (target_insert_breakpoint (breakpoint_addr, shadow_contents) != 0)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
#else /* !BKPT_AT_MAIN */
|
|
|
|
struct symtab_and_line sal;
|
|
|
|
/* Read the debugger interface structure directly. */
|
|
|
|
read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy));
|
|
|
|
/* Set breakpoint at the debugger interface stub routine that will
|
|
be called just prior to each mapping change and again after the
|
|
mapping change is complete. Set up the (nonexistent) handler to
|
|
deal with hitting these breakpoints. (FIXME). */
|
|
|
|
warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__);
|
|
|
|
#endif /* BKPT_AT_MAIN */
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
|
|
|
|
solib_create_inferior_hook -- shared library startup support
|
|
|
|
SYNOPSIS
|
|
|
|
void solib_create_inferior_hook()
|
|
|
|
DESCRIPTION
|
|
|
|
When gdb starts up the inferior, it nurses it along (through the
|
|
shell) until it is ready to execute it's first instruction. At this
|
|
point, this function gets called via expansion of the macro
|
|
SOLIB_CREATE_INFERIOR_HOOK.
|
|
|
|
For both SunOS shared libraries, and SVR4 shared libraries, we
|
|
can arrange to cooperate with the dynamic linker to discover the
|
|
names of shared libraries that are dynamically linked, and the
|
|
base addresses to which they are linked.
|
|
|
|
This function is responsible for discovering those names and
|
|
addresses, and saving sufficient information about them to allow
|
|
their symbols to be read at a later time.
|
|
|
|
FIXME
|
|
|
|
Between enable_break() and disable_break(), this code does not
|
|
properly handle hitting breakpoints which the user might have
|
|
set in the startup code or in the dynamic linker itself. Proper
|
|
handling will probably have to wait until the implementation is
|
|
changed to use the "breakpoint handler function" method.
|
|
|
|
Also, what if child has exit()ed? Must exit loop somehow.
|
|
*/
|
|
|
|
void
|
|
solib_create_inferior_hook()
|
|
{
|
|
|
|
if ((debug_base = locate_base ()) == 0)
|
|
{
|
|
/* Can't find the symbol or the executable is statically linked. */
|
|
return;
|
|
}
|
|
|
|
if (!enable_break ())
|
|
{
|
|
warning ("shared library handler failed to enable breakpoint");
|
|
return;
|
|
}
|
|
|
|
/* Now run the target. It will eventually hit the breakpoint, at
|
|
which point all of the libraries will have been mapped in and we
|
|
can go groveling around in the dynamic linker structures to find
|
|
out what we need to know about them. */
|
|
|
|
clear_proceed_status ();
|
|
stop_soon_quietly = 1;
|
|
stop_signal = 0;
|
|
do
|
|
{
|
|
target_resume (0, stop_signal);
|
|
wait_for_inferior ();
|
|
}
|
|
while (stop_signal != SIGTRAP);
|
|
stop_soon_quietly = 0;
|
|
|
|
/* We are now either at the "mapping complete" breakpoint (or somewhere
|
|
else, a condition we aren't prepared to deal with anyway), so adjust
|
|
the PC as necessary after a breakpoint, disable the breakpoint, and
|
|
add any shared libraries that were mapped in. */
|
|
|
|
if (DECR_PC_AFTER_BREAK)
|
|
{
|
|
stop_pc -= DECR_PC_AFTER_BREAK;
|
|
write_register (PC_REGNUM, stop_pc);
|
|
}
|
|
|
|
if (!disable_break ())
|
|
{
|
|
warning ("shared library handler failed to disable breakpoint");
|
|
}
|
|
|
|
solib_add ((char *) 0, 0, (struct target_ops *) 0);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
special_symbol_handling -- additional shared library symbol handling
|
|
|
|
SYNOPSIS
|
|
|
|
void special_symbol_handling (struct so_list *so)
|
|
|
|
DESCRIPTION
|
|
|
|
Once the symbols from a shared object have been loaded in the usual
|
|
way, we are called to do any system specific symbol handling that
|
|
is needed.
|
|
|
|
For Suns, this consists of grunging around in the dynamic linkers
|
|
structures to find symbol definitions for "common" symbols and
|
|
adding them to the minimal symbol table for the corresponding
|
|
objfile.
|
|
|
|
*/
|
|
|
|
static void
|
|
special_symbol_handling (so)
|
|
struct so_list *so;
|
|
{
|
|
#ifndef SVR4_SHARED_LIBS
|
|
int j;
|
|
|
|
if (debug_addr == 0)
|
|
{
|
|
/* Get link_dynamic structure */
|
|
|
|
j = target_read_memory (debug_base, (char *) &dynamic_copy,
|
|
sizeof (dynamic_copy));
|
|
if (j)
|
|
{
|
|
/* unreadable */
|
|
return;
|
|
}
|
|
|
|
/* Calc address of debugger interface structure */
|
|
/* FIXME, this needs work for cross-debugging of core files
|
|
(byteorder, size, alignment, etc). */
|
|
|
|
debug_addr = (CORE_ADDR) dynamic_copy.ldd;
|
|
}
|
|
|
|
/* Read the debugger structure from the inferior, just to make sure
|
|
we have a current copy. */
|
|
|
|
j = target_read_memory (debug_addr, (char *) &debug_copy,
|
|
sizeof (debug_copy));
|
|
if (j)
|
|
return; /* unreadable */
|
|
|
|
/* Get common symbol definitions for the loaded object. */
|
|
|
|
if (debug_copy.ldd_cp)
|
|
{
|
|
solib_add_common_symbols (debug_copy.ldd_cp, so -> objfile);
|
|
}
|
|
|
|
#endif /* !SVR4_SHARED_LIBS */
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
sharedlibrary_command -- handle command to explicitly add library
|
|
|
|
SYNOPSIS
|
|
|
|
static void sharedlibrary_command (char *args, int from_tty)
|
|
|
|
DESCRIPTION
|
|
|
|
*/
|
|
|
|
static void
|
|
sharedlibrary_command (args, from_tty)
|
|
char *args;
|
|
int from_tty;
|
|
{
|
|
dont_repeat ();
|
|
solib_add (args, from_tty, (struct target_ops *) 0);
|
|
}
|
|
|
|
void
|
|
_initialize_solib()
|
|
{
|
|
|
|
add_com ("sharedlibrary", class_files, sharedlibrary_command,
|
|
"Load shared object library symbols for files matching REGEXP.");
|
|
add_info ("sharedlibrary", info_sharedlibrary_command,
|
|
"Status of loaded shared object libraries.");
|
|
}
|