| /* Handle OSF/1 shared libraries for GDB, the GNU Debugger. |
| Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* FIXME: Most of this code could be merged with solib.c by using |
| next_link_map_member and xfer_link_map_member in solib.c. */ |
| |
| #include "defs.h" |
| |
| #include <sys/types.h> |
| #include <signal.h> |
| #include "gdb_string.h" |
| #include <fcntl.h> |
| |
| #include "symtab.h" |
| #include "bfd.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "gdbcore.h" |
| #include "command.h" |
| #include "target.h" |
| #include "frame.h" |
| #include "gdb_regex.h" |
| #include "inferior.h" |
| #include "language.h" |
| #include "gdbcmd.h" |
| |
| #define MAX_PATH_SIZE 1024 /* FIXME: Should be dynamic */ |
| |
| /* When handling shared libraries, GDB has to find out the pathnames |
| of all shared libraries that are currently loaded (to read in their |
| symbols) and where the shared libraries are loaded in memory |
| (to relocate them properly from their prelinked addresses to the |
| current load address). |
| |
| Under OSF/1 there are two possibilities to get at this information: |
| 1) Peek around in the runtime loader structures. |
| These are not documented, and they are not defined in the system |
| header files. The definitions below were obtained by experimentation, |
| but they seem stable enough. |
| 2) Use the undocumented libxproc.a library, which contains the |
| equivalent ldr_* routines. |
| This approach is somewhat cleaner, but it requires that the GDB |
| executable is dynamically linked. In addition it requires a |
| NAT_CLIBS= -lxproc -Wl,-expect_unresolved,ldr_process_context |
| linker specification for GDB and all applications that are using |
| libgdb. |
| We will use the peeking approach until it becomes unwieldy. */ |
| |
| #ifndef USE_LDR_ROUTINES |
| |
| /* Definition of runtime loader structures, found by experimentation. */ |
| #define RLD_CONTEXT_ADDRESS 0x3ffc0000000 |
| |
| typedef struct |
| { |
| CORE_ADDR next; |
| CORE_ADDR previous; |
| CORE_ADDR unknown1; |
| char *module_name; |
| CORE_ADDR modinfo_addr; |
| long module_id; |
| CORE_ADDR unknown2; |
| CORE_ADDR unknown3; |
| long region_count; |
| CORE_ADDR regioninfo_addr; |
| } |
| ldr_module_info_t; |
| |
| typedef struct |
| { |
| long unknown1; |
| CORE_ADDR regionname_addr; |
| long protection; |
| CORE_ADDR vaddr; |
| CORE_ADDR mapaddr; |
| long size; |
| long unknown2[5]; |
| } |
| ldr_region_info_t; |
| |
| typedef struct |
| { |
| CORE_ADDR unknown1; |
| CORE_ADDR unknown2; |
| CORE_ADDR head; |
| CORE_ADDR tail; |
| } |
| ldr_context_t; |
| |
| static ldr_context_t ldr_context; |
| |
| #else |
| |
| #include <loader.h> |
| static ldr_process_t fake_ldr_process; |
| |
| /* Called by ldr_* routines to read memory from the current target. */ |
| |
| static int ldr_read_memory (CORE_ADDR, char *, int, int); |
| |
| static int |
| ldr_read_memory (CORE_ADDR memaddr, char *myaddr, int len, int readstring) |
| { |
| int result; |
| char *buffer; |
| |
| if (readstring) |
| { |
| target_read_string (memaddr, &buffer, len, &result); |
| if (result == 0) |
| strcpy (myaddr, buffer); |
| xfree (buffer); |
| } |
| else |
| result = target_read_memory (memaddr, myaddr, len); |
| |
| if (result != 0) |
| result = -result; |
| return result; |
| } |
| |
| #endif |
| |
| /* Define our own link_map structure. |
| This will help to share code with solib.c. */ |
| |
| struct link_map |
| { |
| CORE_ADDR l_offset; /* prelink to load address offset */ |
| char *l_name; /* full name of loaded object */ |
| ldr_module_info_t module_info; /* corresponding module info */ |
| }; |
| |
| #define LM_OFFSET(so) ((so) -> lm.l_offset) |
| #define LM_NAME(so) ((so) -> lm.l_name) |
| |
| struct so_list |
| { |
| struct so_list *next; /* next structure in linked list */ |
| struct link_map lm; /* copy of link map from inferior */ |
| struct link_map *lmaddr; /* addr in inferior lm was read from */ |
| CORE_ADDR lmend; /* upper addr bound of mapped object */ |
| char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */ |
| char symbols_loaded; /* flag: symbols read in yet? */ |
| char from_tty; /* flag: print msgs? */ |
| struct objfile *objfile; /* objfile for loaded lib */ |
| struct section_table *sections; |
| struct section_table *sections_end; |
| struct section_table *textsection; |
| bfd *abfd; |
| }; |
| |
| static struct so_list *so_list_head; /* List of known shared objects */ |
| |
| extern int fdmatch (int, int); /* In libiberty */ |
| |
| /* Local function prototypes */ |
| |
| static void sharedlibrary_command (char *, int); |
| |
| static void info_sharedlibrary_command (char *, int); |
| |
| static int symbol_add_stub (char *); |
| |
| static struct so_list *find_solib (struct so_list *); |
| |
| static struct link_map *first_link_map_member (void); |
| |
| static struct link_map *next_link_map_member (struct so_list *); |
| |
| static void xfer_link_map_member (struct so_list *, struct link_map *); |
| |
| static int solib_map_sections (char *); |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| solib_map_sections -- open bfd and build sections for shared lib |
| |
| SYNOPSIS |
| |
| static int solib_map_sections (struct so_list *so) |
| |
| DESCRIPTION |
| |
| Given a pointer to one of the shared objects in our list |
| of mapped objects, use the recorded name to open a bfd |
| descriptor for the object, build a section table, and then |
| relocate all the section addresses by the base address at |
| which the shared object was mapped. |
| |
| FIXMES |
| |
| In most (all?) cases the shared object file name recorded in the |
| dynamic linkage tables will be a fully qualified pathname. For |
| cases where it isn't, do we really mimic the systems search |
| mechanism correctly in the below code (particularly the tilde |
| expansion stuff?). |
| */ |
| |
| static int |
| solib_map_sections (char *arg) |
| { |
| struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */ |
| char *filename; |
| char *scratch_pathname; |
| int scratch_chan; |
| struct section_table *p; |
| struct cleanup *old_chain; |
| bfd *abfd; |
| |
| filename = tilde_expand (so->so_name); |
| old_chain = make_cleanup (xfree, filename); |
| |
| scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
| &scratch_pathname); |
| if (scratch_chan < 0) |
| { |
| scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, |
| O_RDONLY, 0, &scratch_pathname); |
| } |
| if (scratch_chan < 0) |
| { |
| perror_with_name (filename); |
| } |
| /* Leave scratch_pathname allocated. bfd->name will point to it. */ |
| |
| abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan); |
| if (!abfd) |
| { |
| close (scratch_chan); |
| error ("Could not open `%s' as an executable file: %s", |
| scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| } |
| /* Leave bfd open, core_xfer_memory and "info files" need it. */ |
| so->abfd = abfd; |
| abfd->cacheable = true; |
| |
| if (!bfd_check_format (abfd, bfd_object)) |
| { |
| error ("\"%s\": not in executable format: %s.", |
| scratch_pathname, bfd_errmsg (bfd_get_error ())); |
| } |
| if (build_section_table (abfd, &so->sections, &so->sections_end)) |
| { |
| error ("Can't find the file sections in `%s': %s", |
| bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ())); |
| } |
| |
| for (p = so->sections; p < so->sections_end; p++) |
| { |
| /* Relocate the section binding addresses as recorded in the shared |
| object's file by the offset to get the address to which the |
| object was actually mapped. */ |
| p->addr += LM_OFFSET (so); |
| p->endaddr += LM_OFFSET (so); |
| so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend); |
| if (STREQ (p->the_bfd_section->name, ".text")) |
| { |
| so->textsection = p; |
| } |
| } |
| |
| /* Free the file names, close the file now. */ |
| do_cleanups (old_chain); |
| |
| return (1); |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| first_link_map_member -- locate first member in dynamic linker's map |
| |
| SYNOPSIS |
| |
| static struct link_map *first_link_map_member (void) |
| |
| DESCRIPTION |
| |
| Read in a copy of the first member in the inferior's dynamic |
| link map from the inferior's dynamic linker structures, and return |
| a pointer to the copy in our address space. |
| */ |
| |
| static struct link_map * |
| first_link_map_member (void) |
| { |
| struct link_map *lm = NULL; |
| static struct link_map first_lm; |
| |
| #ifdef USE_LDR_ROUTINES |
| ldr_module_t mod_id = LDR_NULL_MODULE; |
| size_t retsize; |
| |
| fake_ldr_process = ldr_core_process (); |
| ldr_set_core_reader (ldr_read_memory); |
| ldr_xdetach (fake_ldr_process); |
| if (ldr_xattach (fake_ldr_process) != 0 |
| || ldr_next_module (fake_ldr_process, &mod_id) != 0 |
| || mod_id == LDR_NULL_MODULE |
| || ldr_inq_module (fake_ldr_process, mod_id, |
| &first_lm.module_info, sizeof (ldr_module_info_t), |
| &retsize) != 0) |
| return lm; |
| #else |
| CORE_ADDR ldr_context_addr; |
| |
| if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS, |
| (char *) &ldr_context_addr, |
| sizeof (CORE_ADDR)) != 0 |
| || target_read_memory (ldr_context_addr, |
| (char *) &ldr_context, |
| sizeof (ldr_context_t)) != 0 |
| || target_read_memory ((CORE_ADDR) ldr_context.head, |
| (char *) &first_lm.module_info, |
| sizeof (ldr_module_info_t)) != 0) |
| return lm; |
| #endif |
| |
| lm = &first_lm; |
| |
| /* The first entry is for the main program and should be skipped. */ |
| lm->l_name = NULL; |
| |
| return lm; |
| } |
| |
| static struct link_map * |
| next_link_map_member (struct so_list *so_list_ptr) |
| { |
| struct link_map *lm = NULL; |
| static struct link_map next_lm; |
| #ifdef USE_LDR_ROUTINES |
| ldr_module_t mod_id = so_list_ptr->lm.module_info.lmi_modid; |
| size_t retsize; |
| |
| if (ldr_next_module (fake_ldr_process, &mod_id) != 0 |
| || mod_id == LDR_NULL_MODULE |
| || ldr_inq_module (fake_ldr_process, mod_id, |
| &next_lm.module_info, sizeof (ldr_module_info_t), |
| &retsize) != 0) |
| return lm; |
| |
| lm = &next_lm; |
| lm->l_name = lm->module_info.lmi_name; |
| #else |
| CORE_ADDR ldr_context_addr; |
| |
| /* Reread context in case ldr_context.tail was updated. */ |
| |
| if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS, |
| (char *) &ldr_context_addr, |
| sizeof (CORE_ADDR)) != 0 |
| || target_read_memory (ldr_context_addr, |
| (char *) &ldr_context, |
| sizeof (ldr_context_t)) != 0 |
| || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail |
| || target_read_memory (so_list_ptr->lm.module_info.next, |
| (char *) &next_lm.module_info, |
| sizeof (ldr_module_info_t)) != 0) |
| return lm; |
| |
| lm = &next_lm; |
| lm->l_name = lm->module_info.module_name; |
| #endif |
| return lm; |
| } |
| |
| static void |
| xfer_link_map_member (struct so_list *so_list_ptr, struct link_map *lm) |
| { |
| int i; |
| so_list_ptr->lm = *lm; |
| |
| /* OSF/1 shared libraries are pre-linked to particular addresses, |
| but the runtime loader may have to relocate them if the |
| address ranges of the libraries used by the target executable clash, |
| or if the target executable is linked with the -taso option. |
| The offset is the difference between the address where the shared |
| library is mapped and the pre-linked address of the shared library. |
| |
| FIXME: GDB is currently unable to relocate the shared library |
| sections by different offsets. If sections are relocated by |
| different offsets, put out a warning and use the offset of the |
| first section for all remaining sections. */ |
| LM_OFFSET (so_list_ptr) = 0; |
| |
| /* There is one entry that has no name (for the inferior executable) |
| since it is not a shared object. */ |
| if (LM_NAME (so_list_ptr) != 0) |
| { |
| |
| #ifdef USE_LDR_ROUTINES |
| int len = strlen (LM_NAME (so_list_ptr) + 1); |
| |
| if (len > MAX_PATH_SIZE) |
| len = MAX_PATH_SIZE; |
| strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE); |
| so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0'; |
| |
| for (i = 0; i < lm->module_info.lmi_nregion; i++) |
| { |
| ldr_region_info_t region_info; |
| size_t retsize; |
| CORE_ADDR region_offset; |
| |
| if (ldr_inq_region (fake_ldr_process, lm->module_info.lmi_modid, |
| i, ®ion_info, sizeof (region_info), |
| &retsize) != 0) |
| break; |
| region_offset = (CORE_ADDR) region_info.lri_mapaddr |
| - (CORE_ADDR) region_info.lri_vaddr; |
| if (i == 0) |
| LM_OFFSET (so_list_ptr) = region_offset; |
| else if (LM_OFFSET (so_list_ptr) != region_offset) |
| warning ("cannot handle shared library relocation for %s (%s)", |
| so_list_ptr->so_name, region_info.lri_name); |
| } |
| #else |
| int errcode; |
| char *buffer; |
| target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer, |
| MAX_PATH_SIZE - 1, &errcode); |
| if (errcode != 0) |
| error ("xfer_link_map_member: Can't read pathname for load map: %s\n", |
| safe_strerror (errcode)); |
| strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1); |
| xfree (buffer); |
| so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0'; |
| |
| for (i = 0; i < lm->module_info.region_count; i++) |
| { |
| ldr_region_info_t region_info; |
| CORE_ADDR region_offset; |
| |
| if (target_read_memory (lm->module_info.regioninfo_addr |
| + i * sizeof (region_info), |
| (char *) ®ion_info, |
| sizeof (region_info)) != 0) |
| break; |
| region_offset = region_info.mapaddr - region_info.vaddr; |
| if (i == 0) |
| LM_OFFSET (so_list_ptr) = region_offset; |
| else if (LM_OFFSET (so_list_ptr) != region_offset) |
| { |
| char *region_name; |
| target_read_string (region_info.regionname_addr, &buffer, |
| MAX_PATH_SIZE - 1, &errcode); |
| if (errcode == 0) |
| region_name = buffer; |
| else |
| region_name = "??"; |
| warning ("cannot handle shared library relocation for %s (%s)", |
| so_list_ptr->so_name, region_name); |
| xfree (buffer); |
| } |
| } |
| #endif |
| |
| catch_errors (solib_map_sections, (char *) so_list_ptr, |
| "Error while mapping shared library sections:\n", |
| RETURN_MASK_ALL); |
| } |
| } |
| |
| /* |
| |
| 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 (struct so_list *so_list_ptr) |
| { |
| 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) |
| { |
| /* Find 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. */ |
| lm = next_link_map_member (so_list_ptr); |
| 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; |
| xfer_link_map_member (new, lm); |
| } |
| return (so_list_next); |
| } |
| |
| /* A small stub to get us past the arg-passing pinhole of catch_errors. */ |
| |
| static int |
| symbol_add_stub (char *arg) |
| { |
| register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */ |
| CORE_ADDR text_addr = 0; |
| struct section_addr_info section_addrs; |
| |
| memset (§ion_addrs, 0, sizeof (section_addrs)); |
| if (so->textsection) |
| text_addr = so->textsection->addr; |
| else if (so->abfd != NULL) |
| { |
| asection *lowest_sect; |
| |
| /* If we didn't find a mapped non zero sized .text section, set up |
| text_addr so that the relocation in symbol_file_add does no harm. */ |
| |
| lowest_sect = bfd_get_section_by_name (so->abfd, ".text"); |
| if (lowest_sect == NULL) |
| bfd_map_over_sections (so->abfd, find_lowest_section, |
| (PTR) &lowest_sect); |
| if (lowest_sect) |
| text_addr = bfd_section_vma (so->abfd, lowest_sect) + LM_OFFSET (so); |
| } |
| |
| section_addrs.other[0].addr = text_addr; |
| section_addrs.other[0].name = ".text"; |
| so->objfile = symbol_file_add (so->so_name, so->from_tty, |
| §ion_addrs, 0, OBJF_SHARED); |
| 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 (char *arg_string, int from_tty, struct target_ops *target) |
| { |
| register struct so_list *so = NULL; /* link map state variable */ |
| |
| /* Last shared library that we read. */ |
| struct so_list *so_last = NULL; |
| |
| char *re_err; |
| int count; |
| int old; |
| |
| if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL) |
| { |
| error ("Invalid regexp: %s", re_err); |
| } |
| |
| |
| /* 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) |
| { |
| /* Add these section table entries to the target's table. */ |
| |
| old = target_resize_to_sections (target, count); |
| |
| 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; |
| } |
| } |
| } |
| } |
| |
| /* Now add the symbol files. */ |
| so = NULL; |
| while ((so = find_solib (so)) != NULL) |
| { |
| if (so->so_name[0] && re_exec (so->so_name)) |
| { |
| so->from_tty = from_tty; |
| if (so->symbols_loaded) |
| { |
| if (from_tty) |
| { |
| printf_unfiltered ("Symbols already loaded for %s\n", so->so_name); |
| } |
| } |
| else if (catch_errors |
| (symbol_add_stub, (char *) so, |
| "Error while reading shared library symbols:\n", |
| RETURN_MASK_ALL)) |
| { |
| so_last = so; |
| so->symbols_loaded = 1; |
| } |
| } |
| } |
| |
| /* Getting new symbols may change our opinion about what is |
| frameless. */ |
| if (so_last) |
| reinit_frame_cache (); |
| } |
| |
| /* |
| |
| 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 (char *ignore, int from_tty) |
| { |
| register struct so_list *so = NULL; /* link map state variable */ |
| int header_done = 0; |
| |
| if (exec_bfd == NULL) |
| { |
| printf_unfiltered ("No executable file.\n"); |
| return; |
| } |
| while ((so = find_solib (so)) != NULL) |
| { |
| if (so->so_name[0]) |
| { |
| unsigned long txt_start = 0; |
| unsigned long txt_end = 0; |
| |
| if (!header_done) |
| { |
| printf_unfiltered ("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read", |
| "Shared Object Library"); |
| header_done++; |
| } |
| if (so->textsection) |
| { |
| txt_start = (unsigned long) so->textsection->addr; |
| txt_end = (unsigned long) so->textsection->endaddr; |
| } |
| printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l")); |
| printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l")); |
| printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No"); |
| printf_unfiltered ("%s\n", so->so_name); |
| } |
| } |
| if (so_list_head == NULL) |
| { |
| printf_unfiltered ("No shared libraries loaded at this time.\n"); |
| } |
| } |
| |
| /* |
| |
| GLOBAL FUNCTION |
| |
| solib_address -- check to see if an address is in a shared lib |
| |
| SYNOPSIS |
| |
| char *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. |
| */ |
| |
| char * |
| solib_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] && so->textsection) |
| { |
| if ((address >= (CORE_ADDR) so->textsection->addr) && |
| (address < (CORE_ADDR) so->textsection->endaddr)) |
| return (so->so_name); |
| } |
| } |
| return (0); |
| } |
| |
| /* Called by free_all_symtabs */ |
| |
| void |
| clear_solib (void) |
| { |
| struct so_list *next; |
| char *bfd_filename; |
| |
| disable_breakpoints_in_shlibs (1); |
| |
| while (so_list_head) |
| { |
| if (so_list_head->sections) |
| { |
| xfree (so_list_head->sections); |
| } |
| if (so_list_head->abfd) |
| { |
| bfd_filename = bfd_get_filename (so_list_head->abfd); |
| if (!bfd_close (so_list_head->abfd)) |
| warning ("cannot close \"%s\": %s", |
| bfd_filename, bfd_errmsg (bfd_get_error ())); |
| } |
| else |
| /* This happens for the executable on SVR4. */ |
| bfd_filename = NULL; |
| |
| next = so_list_head->next; |
| if (bfd_filename) |
| xfree (bfd_filename); |
| xfree (so_list_head); |
| so_list_head = next; |
| } |
| } |
| |
| /* |
| |
| 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 a statically bound executable, this first instruction is the |
| one at "_start", or a similar text label. No further processing is |
| needed in that case. |
| For a dynamically bound executable, this first instruction is somewhere |
| in the rld, and the actual user executable is not yet mapped in. |
| We continue the inferior again, rld then maps in the actual user |
| executable and any needed shared libraries and then sends |
| itself a SIGTRAP. |
| At that point we discover the names of all shared libraries and |
| read their symbols in. |
| |
| FIXME |
| |
| This code does not properly handle hitting breakpoints which the |
| user might have set in the rld itself. Proper handling would have |
| to check if the SIGTRAP happened due to a kill call. |
| |
| Also, what if child has exit()ed? Must exit loop somehow. |
| */ |
| |
| void |
| solib_create_inferior_hook (void) |
| { |
| |
| /* Nothing to do for statically bound executables. */ |
| |
| if (symfile_objfile == NULL |
| || symfile_objfile->obfd == NULL |
| || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0)) |
| return; |
| |
| /* Now run the target. It will eventually get a SIGTRAP, at |
| which point all of the libraries will have been mapped in and we |
| can go groveling around in the rld structures to find |
| out what we need to know about them. */ |
| |
| clear_proceed_status (); |
| stop_soon_quietly = 1; |
| stop_signal = TARGET_SIGNAL_0; |
| do |
| { |
| target_resume (-1, 0, stop_signal); |
| wait_for_inferior (); |
| } |
| while (stop_signal != TARGET_SIGNAL_TRAP); |
| |
| /* solib_add will call reinit_frame_cache. |
| But we are stopped in the runtime loader and we do not have symbols |
| for the runtime loader. So heuristic_proc_start will be called |
| and will put out an annoying warning. |
| Delaying the resetting of stop_soon_quietly until after symbol loading |
| suppresses the warning. */ |
| if (auto_solib_add) |
| solib_add ((char *) 0, 0, (struct target_ops *) 0); |
| stop_soon_quietly = 0; |
| } |
| |
| |
| /* |
| |
| 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 (char *args, int from_tty) |
| { |
| dont_repeat (); |
| solib_add (args, from_tty, (struct target_ops *) 0); |
| } |
| |
| void |
| _initialize_solib (void) |
| { |
| 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."); |
| |
| add_show_from_set |
| (add_set_cmd ("auto-solib-add", class_support, var_zinteger, |
| (char *) &auto_solib_add, |
| "Set autoloading of shared library symbols.\n\ |
| If nonzero, symbols from all shared object libraries will be loaded\n\ |
| automatically when the inferior begins execution or when the dynamic linker\n\ |
| informs gdb that a new library has been loaded. Otherwise, symbols\n\ |
| must be loaded manually, using `sharedlibrary'.", |
| &setlist), |
| &showlist); |
| } |