diff options
| -rw-r--r-- | gdb/ChangeLog | 7 | ||||
| -rw-r--r-- | gdb/solib-pa64.c | 653 | ||||
| -rw-r--r-- | gdb/solib-pa64.h | 27 | ||||
| -rw-r--r-- | gdb/solib-som.c | 898 | ||||
| -rw-r--r-- | gdb/solib-som.h | 35 |
5 files changed, 1620 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 0815837..6ef5c29 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,10 @@ +2004-12-07 Randolph Chung <tausq@debian.org> + + * solib-som.c: New file. + * solib-som.h: New file. + * solib-pa64.c: New file. + * solib-pa64.h: New file. + 2004-12-07 Mark Kettenis <kettenis@gnu.org> * Makefile.in (inf-ttrace.o): Fix typo. diff --git a/gdb/solib-pa64.c b/gdb/solib-pa64.c new file mode 100644 index 0000000..9f54104 --- /dev/null +++ b/gdb/solib-pa64.c @@ -0,0 +1,653 @@ +/* Handle PA64 shared libraries for GDB, the GNU Debugger. + + Copyright 2004 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. + + HP in their infinite stupidity choose not to use standard ELF dynamic + linker interfaces. They also choose not to make their ELF dymamic + linker interfaces compatible with the SOM dynamic linker. The + net result is we can not use either of the existing somsolib.c or + solib.c. What a crock. + + Even more disgusting. This file depends on functions provided only + in certain PA64 libraries. Thus this file is supposed to only be + used native. When will HP ever learn that they need to provide the + same functionality in all their libraries! */ + +#include "defs.h" +#include <dlfcn.h> +#include <elf.h> +#include <elf_hp.h> +#include "symtab.h" +#include "bfd.h" +#include "symfile.h" +#include "objfiles.h" +#include "gdbcore.h" +#include "target.h" +#include "inferior.h" + +#include "hppa-tdep.h" +#include "solist.h" +#include "solib-pa64.h" + +#undef SOLIB_PA64_DBG + +/* If we are building for a SOM-only target, then we don't need this. */ +#ifndef PA_SOM_ONLY + +struct lm_info { + struct load_module_desc desc; + CORE_ADDR desc_addr; +}; + +/* When adding fields, be sure to clear them in _initialize_pa64_solib. */ +typedef struct + { + CORE_ADDR dld_flags_addr; + LONGEST dld_flags; + struct bfd_section *dyninfo_sect; + int have_read_dld_descriptor; + int is_valid; + CORE_ADDR load_map; + CORE_ADDR load_map_addr; + struct load_module_desc dld_desc; + } +dld_cache_t; + +static dld_cache_t dld_cache; + +static int +read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p); + +static void +pa64_relocate_section_addresses (struct so_list *so, + struct section_table *sec) +{ +} + +static void +pa64_free_so (struct so_list *so) +{ + xfree (so->lm_info); +} + +static void +pa64_clear_solib (void) +{ +} + +/* Wrapper for target_read_memory for dlgetmodinfo. */ + +static void * +pa64_target_read_memory (void *buffer, CORE_ADDR ptr, size_t bufsiz, int ident) +{ + if (target_read_memory (ptr, buffer, bufsiz) != 0) + return 0; + return buffer; +} + +/* Read the dynamic linker's internal shared library descriptor. + + This must happen after dld starts running, so we can't do it in + read_dynamic_info. Record the fact that we have loaded the + descriptor. If the library is archive bound, then return zero, else + return nonzero. */ + +static int +read_dld_descriptor (void) +{ + char *dll_path; + asection *dyninfo_sect; + + /* If necessary call read_dynamic_info to extract the contents of the + .dynamic section from the shared library. */ + if (!dld_cache.is_valid) + { + if (symfile_objfile == NULL) + error ("No object file symbols."); + + dyninfo_sect = bfd_get_section_by_name (symfile_objfile->obfd, + ".dynamic"); + if (!dyninfo_sect) + { + return 0; + } + + if (!read_dynamic_info (dyninfo_sect, &dld_cache)) + error ("Unable to read in .dynamic section information."); + } + + /* Read the load map pointer. */ + if (target_read_memory (dld_cache.load_map_addr, + (char *) &dld_cache.load_map, + sizeof (dld_cache.load_map)) + != 0) + { + error ("Error while reading in load map pointer."); + } + + /* Read in the dld load module descriptor */ + if (dlgetmodinfo (-1, + &dld_cache.dld_desc, + sizeof (dld_cache.dld_desc), + pa64_target_read_memory, + 0, + dld_cache.load_map) + == 0) + { + error ("Error trying to get information about dynamic linker."); + } + + /* Indicate that we have loaded the dld descriptor. */ + dld_cache.have_read_dld_descriptor = 1; + + return 1; +} + + +/* Read the .dynamic section and extract the information of interest, + which is stored in dld_cache. The routine elf_locate_base in solib.c + was used as a model for this. */ + +static int +read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p) +{ + char *buf; + char *bufend; + CORE_ADDR dyninfo_addr; + int dyninfo_sect_size; + CORE_ADDR entry_addr; + + /* Read in .dynamic section, silently ignore errors. */ + dyninfo_addr = bfd_section_vma (symfile_objfile->obfd, dyninfo_sect); + dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect); + buf = alloca (dyninfo_sect_size); + if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size)) + return 0; + + /* Scan the .dynamic section and record the items of interest. + In particular, DT_HP_DLD_FLAGS */ + for (bufend = buf + dyninfo_sect_size, entry_addr = dyninfo_addr; + buf < bufend; + buf += sizeof (Elf64_Dyn), entry_addr += sizeof (Elf64_Dyn)) + { + Elf64_Dyn *x_dynp = (Elf64_Dyn*)buf; + Elf64_Sxword dyn_tag; + CORE_ADDR dyn_ptr; + char *pbuf; + + pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT); + dyn_tag = bfd_h_get_64 (symfile_objfile->obfd, + (bfd_byte*) &x_dynp->d_tag); + + /* We can't use a switch here because dyn_tag is 64 bits and HP's + lame comiler does not handle 64bit items in switch statements. */ + if (dyn_tag == DT_NULL) + break; + else if (dyn_tag == DT_HP_DLD_FLAGS) + { + /* Set dld_flags_addr and dld_flags in *dld_cache_p */ + dld_cache_p->dld_flags_addr = entry_addr + offsetof(Elf64_Dyn, d_un); + if (target_read_memory (dld_cache_p->dld_flags_addr, + (char*) &dld_cache_p->dld_flags, + sizeof (dld_cache_p->dld_flags)) + != 0) + { + error ("Error while reading in .dynamic section of the program."); + } + } + else if (dyn_tag == DT_HP_LOAD_MAP) + { + /* Dld will place the address of the load map at load_map_addr + after it starts running. */ + if (target_read_memory (entry_addr + offsetof(Elf64_Dyn, + d_un.d_ptr), + (char*) &dld_cache_p->load_map_addr, + sizeof (dld_cache_p->load_map_addr)) + != 0) + { + error ("Error while reading in .dynamic section of the program."); + } + } + else + { + /* tag is not of interest */ + } + } + + /* Record other information and set is_valid to 1. */ + dld_cache_p->dyninfo_sect = dyninfo_sect; + + /* Verify that we read in required info. These fields are re-set to zero + in pa64_solib_restart. */ + + if (dld_cache_p->dld_flags_addr != 0 && dld_cache_p->load_map_addr != 0) + dld_cache_p->is_valid = 1; + else + return 0; + + return 1; +} + +/* + bfd_lookup_symbol -- lookup the value for a specific symbol + + An expensive way to lookup the value of a single symbol for + bfd's that are only temporary anyway. This is used by the + shared library support to find the address of the debugger + interface structures in the shared library. + + Note that 0 is specifically allowed as an error return (no + such symbol). + */ + +static CORE_ADDR +bfd_lookup_symbol (bfd *abfd, char *symname) +{ + unsigned int storage_needed; + asymbol *sym; + asymbol **symbol_table; + unsigned int number_of_symbols; + unsigned int i; + struct cleanup *back_to; + CORE_ADDR symaddr = 0; + + storage_needed = bfd_get_symtab_upper_bound (abfd); + + if (storage_needed > 0) + { + symbol_table = (asymbol **) xmalloc (storage_needed); + back_to = make_cleanup (xfree, symbol_table); + number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table); + + for (i = 0; i < number_of_symbols; i++) + { + sym = *symbol_table++; + if (strcmp (sym->name, symname) == 0) + { + /* Bfd symbols are section relative. */ + symaddr = sym->value + sym->section->vma; + break; + } + } + do_cleanups (back_to); + } + return (symaddr); +} + + +/* This hook gets called just before the first instruction in the + inferior process is executed. + + This is our opportunity to set magic flags in the inferior so + that GDB can be notified when a shared library is mapped in and + to tell the dynamic linker that a private copy of the library is + needed (so GDB can set breakpoints in the library). + + We need to set two flag bits in this routine. + + DT_HP_DEBUG_PRIVATE to indicate that shared libraries should be + mapped private. + + DT_HP_DEBUG_CALLBACK to indicate that we want the dynamic linker to + call the breakpoint routine for significant events. */ + +static void +pa64_solib_create_inferior_hook (void) +{ + struct minimal_symbol *msymbol; + unsigned int dld_flags, status; + asection *shlib_info, *interp_sect; + char buf[4]; + struct objfile *objfile; + CORE_ADDR anaddr; + + /* First, remove all the solib event breakpoints. Their addresses + may have changed since the last time we ran the program. */ + remove_solib_event_breakpoints (); + + if (symfile_objfile == NULL) + return; + + /* First see if the objfile was dynamically linked. */ + shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic"); + if (!shlib_info) + return; + + /* It's got a .dynamic section, make sure it's not empty. */ + if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) + return; + + /* Read in the .dynamic section. */ + if (! read_dynamic_info (shlib_info, &dld_cache)) + error ("Unable to read the .dynamic section."); + + /* Turn on the flags we care about. */ + dld_cache.dld_flags |= DT_HP_DEBUG_PRIVATE; + dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK; + status = target_write_memory (dld_cache.dld_flags_addr, + (char *) &dld_cache.dld_flags, + sizeof (dld_cache.dld_flags)); + if (status != 0) + error ("Unable to modify dynamic linker flags."); + + /* Now we have to create a shared library breakpoint in the dynamic + linker. This can be somewhat tricky since the symbol is inside + the dynamic linker (for which we do not have symbols or a base + load address! Luckily I wrote this code for solib.c years ago. */ + interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); + if (interp_sect) + { + unsigned int interp_sect_size; + char *buf; + CORE_ADDR load_addr; + bfd *tmp_bfd; + CORE_ADDR sym_addr = 0; + + /* Read the contents of the .interp section into a local buffer; + the contents specify the dynamic linker this program uses. */ + interp_sect_size = bfd_section_size (exec_bfd, interp_sect); + buf = alloca (interp_sect_size); + bfd_get_section_contents (exec_bfd, interp_sect, + buf, 0, interp_sect_size); + + /* Now we need to figure out where the dynamic linker was + loaded so that we can load its symbols and place a breakpoint + in the dynamic linker itself. + + This address is stored on the stack. However, I've been unable + to find any magic formula to find it for Solaris (appears to + be trivial on GNU/Linux). Therefore, we have to try an alternate + mechanism to find the dynamic linker's base address. */ + tmp_bfd = bfd_openr (buf, gnutarget); + if (tmp_bfd == NULL) + return; + + /* Make sure the dynamic linker's really a useful object. */ + if (!bfd_check_format (tmp_bfd, bfd_object)) + { + warning ("Unable to grok dynamic linker %s as an object file", buf); + bfd_close (tmp_bfd); + return; + } + + /* We find the dynamic linker's base address by examining the + current pc (which point at the entry point for the dynamic + linker) and subtracting the offset of the entry point. + + Also note the breakpoint is the second instruction in the + routine. */ + load_addr = read_pc () - tmp_bfd->start_address; + sym_addr = bfd_lookup_symbol (tmp_bfd, "__dld_break"); + sym_addr = load_addr + sym_addr + 4; + + /* Create the shared library breakpoint. */ + { + struct breakpoint *b + = create_solib_event_breakpoint (sym_addr); + + /* The breakpoint is actually hard-coded into the dynamic linker, + so we don't need to actually insert a breakpoint instruction + there. In fact, the dynamic linker's code is immutable, even to + ttrace, so we shouldn't even try to do that. For cases like + this, we have "permanent" breakpoints. */ + make_breakpoint_permanent (b); + } + + /* We're done with the temporary bfd. */ + bfd_close (tmp_bfd); + } +} + +static void +pa64_special_symbol_handling (void) +{ +} + +static struct so_list * +pa64_current_sos (void) +{ + struct so_list *head = 0; + struct so_list **link_ptr = &head; + int dll_index; + + /* Read in the load map pointer if we have not done so already. */ + if (! dld_cache.have_read_dld_descriptor) + if (! read_dld_descriptor ()) + return NULL; + + /* If the libraries were not mapped private, warn the user. */ + if ((dld_cache.dld_flags & DT_HP_DEBUG_PRIVATE) == 0) + warning ("The shared libraries were not privately mapped; setting a\n" + "breakpoint in a shared library will not work until you rerun " + "the program.\n"); + + for (dll_index = 1; ; dll_index++) + { + struct load_module_desc dll_desc; + char *dll_path; + struct so_list *new; + struct cleanup *old_chain; + + /* Read in the load module descriptor. */ + if (dlgetmodinfo (dll_index, &dll_desc, sizeof (dll_desc), + pa64_target_read_memory, 0, dld_cache.load_map) + == 0) + break; + + /* Get the name of the shared library. */ + dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), + pa64_target_read_memory, + 0, dld_cache.load_map); + + if (dll_path == NULL) + dll_path = ""; + + new = (struct so_list *) xmalloc (sizeof (struct so_list)); + memset (new, 0, sizeof (struct so_list)); + new->lm_info = (struct lm_info *) xmalloc (sizeof (struct lm_info)); + memset (new->lm_info, 0, sizeof (struct lm_info)); + + strncpy (new->so_name, dll_path, SO_NAME_MAX_PATH_SIZE - 1); + new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; + strcpy (new->so_original_name, new->so_name); + + memcpy (&new->lm_info->desc, &dll_desc, sizeof (dll_desc)); + +#ifdef SOLIB_PA64_DBG + { + struct load_module_desc *d = &new->lm_info->desc; + printf ("\n+ library \"%s\" is described at index %d\n", new->so_name, + dll_index); + printf (" text_base = 0x%llx\n", d->text_base); + printf (" text_size = 0x%llx\n", d->text_size); + printf (" data_base = 0x%llx\n", d->data_base); + printf (" data_size = 0x%llx\n", d->data_size); + printf (" unwind_base = 0x%llx\n", d->unwind_base); + printf (" linkage_ptr = 0x%llx\n", d->linkage_ptr); + printf (" phdr_base = 0x%llx\n", d->phdr_base); + printf (" tls_size = 0x%llx\n", d->tls_size); + printf (" tls_start_addr = 0x%llx\n", d->tls_start_addr); + printf (" unwind_size = 0x%llx\n", d->unwind_size); + printf (" tls_index = 0x%llx\n", d->tls_index); + } +#endif + + /* Link the new object onto the list. */ + new->next = NULL; + *link_ptr = new; + link_ptr = &new->next; + } + + return head; +} + +static int +pa64_open_symbol_file_object (void *from_ttyp) +{ + int from_tty = *(int *)from_ttyp; + char buf[4]; + struct load_module_desc dll_desc; + char *dll_path; + + if (symfile_objfile) + if (!query ("Attempt to reload symbols from process? ")) + return 0; + + /* Read in the load map pointer if we have not done so already. */ + if (! dld_cache.have_read_dld_descriptor) + if (! read_dld_descriptor ()) + return 0; + + /* Read in the load module descriptor. */ + if (dlgetmodinfo (0, &dll_desc, sizeof (dll_desc), + pa64_target_read_memory, 0, dld_cache.load_map) == 0) + return 0; + + /* Get the name of the shared library. */ + dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc), + pa64_target_read_memory, + 0, dld_cache.load_map); + + /* Have a pathname: read the symbol file. */ + symbol_file_add_main (dll_path, from_tty); + + return 1; +} + +/* Return nonzero if PC is an address inside the dynamic linker. */ +static int +pa64_in_dynsym_resolve_code (CORE_ADDR pc) +{ + asection *shlib_info; + + if (symfile_objfile == NULL) + return 0; + + if (!dld_cache.have_read_dld_descriptor) + if (!read_dld_descriptor ()) + return 0; + + return (pc >= dld_cache.dld_desc.text_base + && pc < dld_cache.dld_desc.text_base + dld_cache.dld_desc.text_size); +} + + +/* Return the GOT value for the shared library in which ADDR belongs. If + ADDR isn't in any known shared library, return zero. */ + +static CORE_ADDR +pa64_solib_get_got_by_pc (CORE_ADDR addr) +{ + struct so_list *so_list = master_so_list (); + CORE_ADDR got_value = 0; + + while (so_list) + { + if (so_list->lm_info->desc.text_base <= addr + && ((so_list->lm_info->desc.text_base + + so_list->lm_info->desc.text_size) + > addr)) + { + got_value = so_list->lm_info->desc.linkage_ptr; + break; + } + so_list = so_list->next; + } + return got_value; +} + +/* Get some HPUX-specific data from a shared lib. */ +static CORE_ADDR +pa64_solib_thread_start_addr (struct so_list *so) +{ + return so->lm_info->desc.tls_start_addr; +} + + +/* Return the address of the handle of the shared library in which ADDR + belongs. If ADDR isn't in any known shared library, return zero. + + This function is used in hppa_fix_call_dummy in hppa-tdep.c. */ + +static CORE_ADDR +pa64_solib_get_solib_by_pc (CORE_ADDR addr) +{ + struct so_list *so_list = master_so_list (); + CORE_ADDR retval = 0; + + while (so_list) + { + if (so_list->lm_info->desc.text_base <= addr + && ((so_list->lm_info->desc.text_base + + so_list->lm_info->desc.text_size) + > addr)) + { + retval = so_list->lm_info->desc_addr; + break; + } + so_list = so_list->next; + } + return retval; +} + +static struct target_so_ops pa64_so_ops; + +extern initialize_file_ftype _initialize_pa64_solib; /* -Wmissing-prototypes */ + +void +_initialize_pa64_solib (void) +{ + pa64_so_ops.relocate_section_addresses = pa64_relocate_section_addresses; + pa64_so_ops.free_so = pa64_free_so; + pa64_so_ops.clear_solib = pa64_clear_solib; + pa64_so_ops.solib_create_inferior_hook = pa64_solib_create_inferior_hook; + pa64_so_ops.special_symbol_handling = pa64_special_symbol_handling; + pa64_so_ops.current_sos = pa64_current_sos; + pa64_so_ops.open_symbol_file_object = pa64_open_symbol_file_object; + pa64_so_ops.in_dynsym_resolve_code = pa64_in_dynsym_resolve_code; + + memset (&dld_cache, 0, sizeof (dld_cache)); +} + +void pa64_solib_select (struct gdbarch_tdep *tdep) +{ + current_target_so_ops = &pa64_so_ops; + + tdep->solib_thread_start_addr = pa64_solib_thread_start_addr; + tdep->solib_get_got_by_pc = pa64_solib_get_got_by_pc; + tdep->solib_get_solib_by_pc = pa64_solib_get_solib_by_pc; +} + +#else /* PA_SOM_ONLY */ + +extern initialize_file_ftype _initialize_pa64_solib; /* -Wmissing-prototypes */ + +void +_initialize_pa64_solib (void) +{ +} + +void pa64_solib_select (struct gdbarch_tdep *tdep) +{ + /* For a SOM-only target, there is no pa64 solib support. This is needed + for hppa-hpux-tdep.c to build. */ + error ("Cannot select pa64 solib support for this configuration.\n"); +} +#endif diff --git a/gdb/solib-pa64.h b/gdb/solib-pa64.h new file mode 100644 index 0000000..c84727e --- /dev/null +++ b/gdb/solib-pa64.h @@ -0,0 +1,27 @@ +/* Handle PA64 shared libraries for GDB, the GNU Debugger. + + Copyright 2004 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. */ + +#ifndef SOLIB_PA64_H +#define SOLIB_PA64_H + +void pa64_solib_select (struct gdbarch_tdep *tdep); + +#endif diff --git a/gdb/solib-som.c b/gdb/solib-som.c new file mode 100644 index 0000000..38c1803 --- /dev/null +++ b/gdb/solib-som.c @@ -0,0 +1,898 @@ +/* Handle SOM shared libraries for GDB, the GNU Debugger. + + Copyright 2004 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. */ + +#include "defs.h" +#include "som.h" +#include "symtab.h" +#include "bfd.h" +#include "symfile.h" +#include "objfiles.h" +#include "gdbcore.h" +#include "target.h" +#include "inferior.h" + +#include "hppa-tdep.h" +#include "solist.h" + +#undef SOLIB_SOM_DBG + +/* These ought to be defined in some public interface, but aren't. They + define the meaning of the various bits in the distinguished __dld_flags + variable that is declared in every debuggable a.out on HP-UX, and that + is shared between the debugger and the dynamic linker. + */ +#define DLD_FLAGS_MAPPRIVATE 0x1 +#define DLD_FLAGS_HOOKVALID 0x2 +#define DLD_FLAGS_LISTVALID 0x4 +#define DLD_FLAGS_BOR_ENABLE 0x8 + +struct lm_info + { + /* Version of this structure (it is expected to change again in hpux10). */ + unsigned char struct_version; + + /* Binding mode for this library. */ + unsigned char bind_mode; + + /* Version of this library. */ + short library_version; + + /* Start of text address, + link-time text location (length of text area), + end of text address. */ + CORE_ADDR text_addr; + CORE_ADDR text_link_addr; + CORE_ADDR text_end; + + /* Start of data, start of bss and end of data. */ + CORE_ADDR data_start; + CORE_ADDR bss_start; + CORE_ADDR data_end; + + /* Value of linkage pointer (%r19). */ + CORE_ADDR got_value; + + /* Address in target of offset from thread-local register of + start of this thread's data. I.e., the first thread-local + variable in this shared library starts at *(tsd_start_addr) + from that area pointed to by cr27 (mpsfu_hi). + + We do the indirection as soon as we read it, so from then + on it's the offset itself. */ + CORE_ADDR tsd_start_addr; + + /* Address of the link map entry in the loader. */ + CORE_ADDR lm_addr; + }; + +/* These addresses should be filled in by som_solib_create_inferior_hook. + They are also used elsewhere in this module. + */ +typedef struct + { + CORE_ADDR address; + struct unwind_table_entry *unwind; + } +addr_and_unwind_t; + +/* When adding fields, be sure to clear them in _initialize_som_solib. */ +static struct + { + int is_valid; + addr_and_unwind_t hook; + addr_and_unwind_t hook_stub; + addr_and_unwind_t load; + addr_and_unwind_t load_stub; + addr_and_unwind_t unload; + addr_and_unwind_t unload2; + addr_and_unwind_t unload_stub; + } +dld_cache; + +static void +som_relocate_section_addresses (struct so_list *so, + struct section_table *sec) +{ + flagword aflag = bfd_get_section_flags(so->abfd, sec->the_bfd_section); + + /* solib.c does something similar, but it only recognizes ".text", SOM calls + the text section "$CODE$". */ + if (strcmp (sec->the_bfd_section->name, "$CODE$") == 0) + { + so->textsection = sec; + } + + if (aflag & SEC_CODE) + { + sec->addr += so->lm_info->text_addr - so->lm_info->text_link_addr; + sec->endaddr += so->lm_info->text_addr - so->lm_info->text_link_addr; + } + else if (aflag & SEC_DATA) + { + sec->addr += so->lm_info->data_start; + sec->endaddr += so->lm_info->data_start; + } + else + ; +} + +/* This hook gets called just before the first instruction in the + inferior process is executed. + + This is our opportunity to set magic flags in the inferior so + that GDB can be notified when a shared library is mapped in and + to tell the dynamic linker that a private copy of the library is + needed (so GDB can set breakpoints in the library). + + __dld_flags is the location of the magic flags; as of this implementation + there are 3 flags of interest: + + bit 0 when set indicates that private copies of the libraries are needed + bit 1 when set indicates that the callback hook routine is valid + bit 2 when set indicates that the dynamic linker should maintain the + __dld_list structure when loading/unloading libraries. + + Note that shared libraries are not mapped in at this time, so we have + run the inferior until the libraries are mapped in. Typically this + means running until the "_start" is called. */ + +static void +som_solib_create_inferior_hook (void) +{ + struct minimal_symbol *msymbol; + unsigned int dld_flags, status, have_endo; + asection *shlib_info; + char buf[4]; + struct objfile *objfile; + CORE_ADDR anaddr; + + /* First, remove all the solib event breakpoints. Their addresses + may have changed since the last time we ran the program. */ + remove_solib_event_breakpoints (); + + if (symfile_objfile == NULL) + return; + + /* First see if the objfile was dynamically linked. */ + shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$"); + if (!shlib_info) + return; + + /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */ + if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0) + return; + + have_endo = 0; + /* Slam the pid of the process into __d_pid. + + We used to warn when this failed, but that warning is only useful + on very old HP systems (hpux9 and older). The warnings are an + annoyance to users of modern systems and foul up the testsuite as + well. As a result, the warnings have been disabled. */ + msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile); + if (msymbol == NULL) + goto keep_going; + + anaddr = SYMBOL_VALUE_ADDRESS (msymbol); + store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); + status = target_write_memory (anaddr, buf, 4); + if (status != 0) + { + warning ("Unable to write __d_pid"); + warning ("Suggest linking with /opt/langtools/lib/end.o."); + warning ("GDB will be unable to track shl_load/shl_unload calls"); + goto keep_going; + } + + /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook; + This will force the dynamic linker to call __d_trap when significant + events occur. + + Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above, + the dld provides an export stub named "__d_trap" as well as the + function named "__d_trap" itself, but doesn't provide "_DLD_HOOK". + We'll look first for the old flavor and then the new. + */ + msymbol = lookup_minimal_symbol ("_DLD_HOOK", NULL, symfile_objfile); + if (msymbol == NULL) + msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); + if (msymbol == NULL) + { + warning ("Unable to find _DLD_HOOK symbol in object file."); + warning ("Suggest linking with /opt/langtools/lib/end.o."); + warning ("GDB will be unable to track shl_load/shl_unload calls"); + goto keep_going; + } + anaddr = SYMBOL_VALUE_ADDRESS (msymbol); + dld_cache.hook.address = anaddr; + + /* Grrr, this might not be an export symbol! We have to find the + export stub. */ + ALL_OBJFILES (objfile) + { + struct unwind_table_entry *u; + struct minimal_symbol *msymbol2; + + /* What a crock. */ + msymbol2 = + lookup_minimal_symbol_solib_trampoline (SYMBOL_LINKAGE_NAME (msymbol), + objfile); + /* Found a symbol with the right name. */ + if (msymbol2) + { + struct unwind_table_entry *u; + /* It must be a shared library trampoline. */ + if (SYMBOL_TYPE (msymbol2) != mst_solib_trampoline) + continue; + + /* It must also be an export stub. */ + u = find_unwind_entry (SYMBOL_VALUE (msymbol2)); + if (!u || u->stub_unwind.stub_type != EXPORT) + continue; + + /* OK. Looks like the correct import stub. */ + anaddr = SYMBOL_VALUE (msymbol2); + dld_cache.hook_stub.address = anaddr; + } + } + store_unsigned_integer (buf, 4, anaddr); + + msymbol = lookup_minimal_symbol ("__dld_hook", NULL, symfile_objfile); + if (msymbol == NULL) + { + warning ("Unable to find __dld_hook symbol in object file."); + warning ("Suggest linking with /opt/langtools/lib/end.o."); + warning ("GDB will be unable to track shl_load/shl_unload calls"); + goto keep_going; + } + anaddr = SYMBOL_VALUE_ADDRESS (msymbol); + status = target_write_memory (anaddr, buf, 4); + + /* Now set a shlib_event breakpoint at __d_trap so we can track + significant shared library events. */ + msymbol = lookup_minimal_symbol ("__d_trap", NULL, symfile_objfile); + if (msymbol == NULL) + { + warning ("Unable to find __dld_d_trap symbol in object file."); + warning ("Suggest linking with /opt/langtools/lib/end.o."); + warning ("GDB will be unable to track shl_load/shl_unload calls"); + goto keep_going; + } + create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol)); + + /* We have all the support usually found in end.o, so we can track + shl_load and shl_unload calls. */ + have_endo = 1; + +keep_going: + + /* Get the address of __dld_flags, if no such symbol exists, then we can + not debug the shared code. */ + msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); + if (msymbol == NULL) + { + error ("Unable to find __dld_flags symbol in object file.\n"); + } + + anaddr = SYMBOL_VALUE_ADDRESS (msymbol); + + /* Read the current contents. */ + status = target_read_memory (anaddr, buf, 4); + if (status != 0) + { + error ("Unable to read __dld_flags\n"); + } + dld_flags = extract_unsigned_integer (buf, 4); + + /* Turn on the flags we care about. */ + dld_flags |= DLD_FLAGS_MAPPRIVATE; + if (have_endo) + dld_flags |= DLD_FLAGS_HOOKVALID; + store_unsigned_integer (buf, 4, dld_flags); + status = target_write_memory (anaddr, buf, 4); + if (status != 0) + { + error ("Unable to write __dld_flags\n"); + } + + /* Now find the address of _start and set a breakpoint there. + We still need this code for two reasons: + + * Not all sites have /opt/langtools/lib/end.o, so it's not always + possible to track the dynamic linker's events. + + * At this time no events are triggered for shared libraries + loaded at startup time (what a crock). */ + + msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile); + if (msymbol == NULL) + { + error ("Unable to find _start symbol in object file.\n"); + } + + anaddr = SYMBOL_VALUE_ADDRESS (msymbol); + + /* Make the breakpoint at "_start" a shared library event breakpoint. */ + create_solib_event_breakpoint (anaddr); + + clear_symtab_users (); +} + +/* This operation removes the "hook" between GDB and the dynamic linker, + which causes the dld to notify GDB of shared library events. + + After this operation completes, the dld will no longer notify GDB of + shared library events. To resume notifications, GDB must call + som_solib_create_inferior_hook. + + This operation does not remove any knowledge of shared libraries which + GDB may already have been notified of. + */ +static void +som_solib_remove_inferior_hook (int pid) +{ + CORE_ADDR addr; + struct minimal_symbol *msymbol; + int status; + char dld_flags_buffer[4]; + unsigned int dld_flags_value; + struct cleanup *old_cleanups = save_inferior_ptid (); + + /* Ensure that we're really operating on the specified process. */ + inferior_ptid = pid_to_ptid (pid); + + /* We won't bother to remove the solib breakpoints from this process. + + In fact, on PA64 the breakpoint is hard-coded into the dld callback, + and thus we're not supposed to remove it. + + Rather, we'll merely clear the dld_flags bit that enables callbacks. + */ + msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL); + + addr = SYMBOL_VALUE_ADDRESS (msymbol); + status = target_read_memory (addr, dld_flags_buffer, 4); + + dld_flags_value = extract_unsigned_integer (dld_flags_buffer, 4); + + dld_flags_value &= ~DLD_FLAGS_HOOKVALID; + store_unsigned_integer (dld_flags_buffer, 4, dld_flags_value); + status = target_write_memory (addr, dld_flags_buffer, 4); + + do_cleanups (old_cleanups); +} + +static void +som_special_symbol_handling (void) +{ +} + +static void +som_solib_desire_dynamic_linker_symbols (void) +{ + struct objfile *objfile; + struct unwind_table_entry *u; + struct minimal_symbol *dld_msymbol; + + /* Do we already know the value of these symbols? If so, then + we've no work to do. + + (If you add clauses to this test, be sure to likewise update the + test within the loop.) + */ + if (dld_cache.is_valid) + return; + + ALL_OBJFILES (objfile) + { + dld_msymbol = lookup_minimal_symbol ("shl_load", NULL, objfile); + if (dld_msymbol != NULL) + { + dld_cache.load.address = SYMBOL_VALUE (dld_msymbol); + dld_cache.load.unwind = find_unwind_entry (dld_cache.load.address); + } + + dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_load", + objfile); + if (dld_msymbol != NULL) + { + if (SYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) + { + u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); + if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) + { + dld_cache.load_stub.address = SYMBOL_VALUE (dld_msymbol); + dld_cache.load_stub.unwind = u; + } + } + } + + dld_msymbol = lookup_minimal_symbol ("shl_unload", NULL, objfile); + if (dld_msymbol != NULL) + { + dld_cache.unload.address = SYMBOL_VALUE (dld_msymbol); + dld_cache.unload.unwind = find_unwind_entry (dld_cache.unload.address); + + /* ??rehrauer: I'm not sure exactly what this is, but it appears + that on some HPUX 10.x versions, there's two unwind regions to + cover the body of "shl_unload", the second being 4 bytes past + the end of the first. This is a large hack to handle that + case, but since I don't seem to have any legitimate way to + look for this thing via the symbol table... + */ + if (dld_cache.unload.unwind != NULL) + { + u = find_unwind_entry (dld_cache.unload.unwind->region_end + 4); + if (u != NULL) + { + dld_cache.unload2.address = u->region_start; + dld_cache.unload2.unwind = u; + } + } + } + + dld_msymbol = lookup_minimal_symbol_solib_trampoline ("shl_unload", + objfile); + if (dld_msymbol != NULL) + { + if (SYMBOL_TYPE (dld_msymbol) == mst_solib_trampoline) + { + u = find_unwind_entry (SYMBOL_VALUE (dld_msymbol)); + if ((u != NULL) && (u->stub_unwind.stub_type == EXPORT)) + { + dld_cache.unload_stub.address = SYMBOL_VALUE (dld_msymbol); + dld_cache.unload_stub.unwind = u; + } + } + } + + /* Did we find everything we were looking for? If so, stop. */ + if ((dld_cache.load.address != 0) + && (dld_cache.load_stub.address != 0) + && (dld_cache.unload.address != 0) + && (dld_cache.unload_stub.address != 0)) + { + dld_cache.is_valid = 1; + break; + } + } + + dld_cache.hook.unwind = find_unwind_entry (dld_cache.hook.address); + dld_cache.hook_stub.unwind = find_unwind_entry (dld_cache.hook_stub.address); + + /* We're prepared not to find some of these symbols, which is why + this function is a "desire" operation, and not a "require". + */ +} + +static int +som_in_dynsym_resolve_code (CORE_ADDR pc) +{ + struct unwind_table_entry *u_pc; + + /* Are we in the dld itself? + + ??rehrauer: Large hack -- We'll assume that any address in a + shared text region is the dld's text. This would obviously + fall down if the user attached to a process, whose shlibs + weren't mapped to a (writeable) private region. However, in + that case the debugger probably isn't able to set the fundamental + breakpoint in the dld callback anyways, so this hack should be + safe. + */ + if ((pc & (CORE_ADDR) 0xc0000000) == (CORE_ADDR) 0xc0000000) + return 1; + + /* Cache the address of some symbols that are part of the dynamic + linker, if not already known. + */ + som_solib_desire_dynamic_linker_symbols (); + + /* Are we in the dld callback? Or its export stub? */ + u_pc = find_unwind_entry (pc); + if (u_pc == NULL) + return 0; + + if ((u_pc == dld_cache.hook.unwind) || (u_pc == dld_cache.hook_stub.unwind)) + return 1; + + /* Or the interface of the dld (i.e., "shl_load" or friends)? */ + if ((u_pc == dld_cache.load.unwind) + || (u_pc == dld_cache.unload.unwind) + || (u_pc == dld_cache.unload2.unwind) + || (u_pc == dld_cache.load_stub.unwind) + || (u_pc == dld_cache.unload_stub.unwind)) + return 1; + + /* Apparently this address isn't part of the dld's text. */ + return 0; +} + +static void +som_clear_solib (void) +{ +} + +struct dld_list { + char name[4]; + char info[4]; + char text_addr[4]; + char text_link_addr[4]; + char text_end[4]; + char data_start[4]; + char bss_start[4]; + char data_end[4]; + char got_value[4]; + char next[4]; + char tsd_start_addr_ptr[4]; +}; + +static CORE_ADDR +link_map_start (void) +{ + struct minimal_symbol *sym; + CORE_ADDR addr; + char buf[4]; + unsigned int dld_flags; + + sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); + if (!sym) + { + error ("Unable to find __dld_flags symbol in object file.\n"); + return 0; + } + addr = SYMBOL_VALUE_ADDRESS (sym); + read_memory (addr, buf, 4); + dld_flags = extract_unsigned_integer (buf, 4); + if ((dld_flags & DLD_FLAGS_LISTVALID) == 0) + { + error ("__dld_list is not valid according to __dld_flags.\n"); + return 0; + } + + /* If the libraries were not mapped private, warn the user. */ + if ((dld_flags & DLD_FLAGS_MAPPRIVATE) == 0) + warning ("The shared libraries were not privately mapped; setting a\n" + "breakpoint in a shared library will not work until you rerun the " + "program.\n"); + + sym = lookup_minimal_symbol ("__dld_list", NULL, NULL); + if (!sym) + { + /* Older crt0.o files (hpux8) don't have __dld_list as a symbol, + but the data is still available if you know where to look. */ + sym = lookup_minimal_symbol ("__dld_flags", NULL, NULL); + if (!sym) + { + error ("Unable to find dynamic library list.\n"); + return 0; + } + addr = SYMBOL_VALUE_ADDRESS (sym) - 8; + } + else + addr = SYMBOL_VALUE_ADDRESS (sym); + + read_memory (addr, buf, 4); + addr = extract_unsigned_integer (buf, 4); + if (addr == 0) + { + error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n"); + return 0; + } + + read_memory (addr, buf, 4); + return extract_unsigned_integer (buf, 4); +} + +/* Does this so's name match the main binary? */ +static int +match_main (const char *name) +{ + return strcmp (name, symfile_objfile->name) == 0; +} + +static struct so_list * +som_current_sos (void) +{ + CORE_ADDR lm; + struct so_list *head = 0; + struct so_list **link_ptr = &head; + + for (lm = link_map_start (); lm; ) + { + char *namebuf; + CORE_ADDR addr; + struct so_list *new; + struct cleanup *old_chain; + int errcode; + struct dld_list dbuf; + char tsdbuf[4]; + + new = (struct so_list *) xmalloc (sizeof (struct so_list)); + old_chain = make_cleanup (xfree, new); + + memset (new, 0, sizeof (*new)); + new->lm_info = xmalloc (sizeof (struct lm_info)); + make_cleanup (xfree, new->lm_info); + + read_memory (lm, (char *)&dbuf, sizeof (struct dld_list)); + + addr = extract_unsigned_integer (&dbuf.name, sizeof (dbuf.name)); + target_read_string (addr, &namebuf, SO_NAME_MAX_PATH_SIZE - 1, &errcode); + if (errcode != 0) + { + warning ("current_sos: Can't read pathname for load map: %s\n", + safe_strerror (errcode)); + } + else + { + strncpy (new->so_name, namebuf, SO_NAME_MAX_PATH_SIZE - 1); + new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; + xfree (namebuf); + strcpy (new->so_original_name, new->so_name); + } + + if (new->so_name[0] && !match_main (new->so_name)) + { + struct lm_info *lmi = new->lm_info; + unsigned int tmp; + + lmi->lm_addr = lm; + +#define EXTRACT(_fld) \ + extract_unsigned_integer (&dbuf._fld, sizeof (dbuf._fld)); + + lmi->text_addr = EXTRACT (text_addr); + tmp = EXTRACT (info); + lmi->library_version = (tmp >> 16) & 0xffff; + lmi->bind_mode = (tmp >> 8) & 0xff; + lmi->struct_version = tmp & 0xff; + lmi->text_link_addr = EXTRACT (text_link_addr); + lmi->text_end = EXTRACT (text_end); + lmi->data_start = EXTRACT (data_start); + lmi->bss_start = EXTRACT (bss_start); + lmi->data_end = EXTRACT (data_end); + lmi->got_value = EXTRACT (got_value); + tmp = EXTRACT (tsd_start_addr_ptr); + read_memory (tmp, tsdbuf, 4); + lmi->tsd_start_addr = extract_unsigned_integer (tsdbuf, 4); + +#ifdef SOLIB_SOM_DBG + printf ("\n+ library \"%s\" is described at 0x%s\n", new->so_name, + paddr_nz (lm)); + printf (" 'version' is %d\n", new->lm_info->struct_version); + printf (" 'bind_mode' is %d\n", new->lm_info->bind_mode); + printf (" 'library_version' is %d\n", + new->lm_info->library_version); + printf (" 'text_addr' is 0x%s\n", + paddr_nz (new->lm_info->text_addr)); + printf (" 'text_link_addr' is 0x%s\n", + paddr_nz (new->lm_info->text_link_addr)); + printf (" 'text_end' is 0x%s\n", + paddr_nz (new->lm_info->text_end)); + printf (" 'data_start' is 0x%s\n", + paddr_nz (new->lm_info->data_start)); + printf (" 'bss_start' is 0x%s\n", + paddr_nz (new->lm_info->bss_start)); + printf (" 'data_end' is 0x%s\n", + paddr_nz (new->lm_info->data_end)); + printf (" 'got_value' is %s\n", + paddr_nz (new->lm_info->got_value)); + printf (" 'tsd_start_addr' is 0x%s\n", + paddr_nz (new->lm_info->tsd_start_addr)); +#endif + + /* Link the new object onto the list. */ + new->next = NULL; + *link_ptr = new; + link_ptr = &new->next; + } + else + { + free_so (new); + } + + lm = EXTRACT (next); + discard_cleanups (old_chain); +#undef EXTRACT + } + + /* TODO: The original somsolib code has logic to detect and eliminate + duplicate entries. Do we need that? */ + + return head; +} + +static int +som_open_symbol_file_object (void *from_ttyp) +{ + CORE_ADDR lm, l_name; + char *filename; + int errcode; + int from_tty = *(int *)from_ttyp; + char buf[4]; + + if (symfile_objfile) + if (!query ("Attempt to reload symbols from process? ")) + return 0; + + /* First link map member should be the executable. */ + if ((lm = link_map_start ()) == 0) + return 0; /* failed somehow... */ + + /* Read address of name from target memory to GDB. */ + read_memory (lm + offsetof (struct dld_list, name), buf, 4); + + /* Convert the address to host format. Assume that the address is + unsigned. */ + l_name = extract_unsigned_integer (buf, 4); + + if (l_name == 0) + return 0; /* No filename. */ + + /* Now fetch the filename from target memory. */ + target_read_string (l_name, &filename, SO_NAME_MAX_PATH_SIZE - 1, &errcode); + + if (errcode) + { + warning ("failed to read exec filename from attached file: %s", + safe_strerror (errcode)); + return 0; + } + + make_cleanup (xfree, filename); + /* Have a pathname: read the symbol file. */ + symbol_file_add_main (filename, from_tty); + + return 1; +} + +static void +som_free_so (struct so_list *so) +{ + xfree (so->lm_info); +} + +static CORE_ADDR +som_solib_thread_start_addr (struct so_list *so) +{ + return so->lm_info->tsd_start_addr; +} + +/* Return the GOT value for the shared library in which ADDR belongs. If + ADDR isn't in any known shared library, return zero. */ + +static CORE_ADDR +som_solib_get_got_by_pc (CORE_ADDR addr) +{ + struct so_list *so_list = master_so_list (); + CORE_ADDR got_value = 0; + + while (so_list) + { + if (so_list->lm_info->text_addr <= addr + && so_list->lm_info->text_end > addr) + { + got_value = so_list->lm_info->got_value; + break; + } + so_list = so_list->next; + } + return got_value; +} + +/* Return the address of the handle of the shared library in which ADDR belongs. + If ADDR isn't in any known shared library, return zero. */ +/* this function is used in initialize_hp_cxx_exception_support in + hppa-hpux-tdep.c */ + +static CORE_ADDR +som_solib_get_solib_by_pc (CORE_ADDR addr) +{ + struct so_list *so_list = master_so_list (); + + while (so_list) + { + if (so_list->lm_info->text_addr <= addr + && so_list->lm_info->text_end > addr) + { + break; + } + so_list = so_list->next; + } + if (so_list) + return so_list->lm_info->lm_addr; + else + return 0; +} + + +static struct target_so_ops som_so_ops; + +extern initialize_file_ftype _initialize_som_solib; /* -Wmissing-prototypes */ + +void +_initialize_som_solib (void) +{ + som_so_ops.relocate_section_addresses = som_relocate_section_addresses; + som_so_ops.free_so = som_free_so; + som_so_ops.clear_solib = som_clear_solib; + som_so_ops.solib_create_inferior_hook = som_solib_create_inferior_hook; + som_so_ops.special_symbol_handling = som_special_symbol_handling; + som_so_ops.current_sos = som_current_sos; + som_so_ops.open_symbol_file_object = som_open_symbol_file_object; + som_so_ops.in_dynsym_resolve_code = som_in_dynsym_resolve_code; +} + +void som_solib_select (struct gdbarch_tdep *tdep) +{ + current_target_so_ops = &som_so_ops; + + tdep->solib_thread_start_addr = som_solib_thread_start_addr; + tdep->solib_get_got_by_pc = som_solib_get_got_by_pc; + tdep->solib_get_solib_by_pc = som_solib_get_solib_by_pc; +} + +/* The rest of these functions are not part of the solib interface; they + are used by somread.c or hppa-hpux-tdep.c */ + +int +som_solib_section_offsets (struct objfile *objfile, + struct section_offsets *offsets) +{ + struct so_list *so_list = master_so_list (); + + while (so_list) + { + /* Oh what a pain! We need the offsets before so_list->objfile + is valid. The BFDs will never match. Make a best guess. */ + if (strstr (objfile->name, so_list->so_name)) + { + asection *private_section; + + /* The text offset is easy. */ + offsets->offsets[SECT_OFF_TEXT (objfile)] + = (so_list->lm_info->text_addr + - so_list->lm_info->text_link_addr); + offsets->offsets[SECT_OFF_RODATA (objfile)] + = ANOFFSET (offsets, SECT_OFF_TEXT (objfile)); + + /* We should look at presumed_dp in the SOM header, but + that's not easily available. This should be OK though. */ + private_section = bfd_get_section_by_name (objfile->obfd, + "$PRIVATE$"); + if (!private_section) + { + warning ("Unable to find $PRIVATE$ in shared library!"); + offsets->offsets[SECT_OFF_DATA (objfile)] = 0; + offsets->offsets[SECT_OFF_BSS (objfile)] = 0; + return 1; + } + offsets->offsets[SECT_OFF_DATA (objfile)] + = (so_list->lm_info->data_start - private_section->vma); + offsets->offsets[SECT_OFF_BSS (objfile)] + = ANOFFSET (offsets, SECT_OFF_DATA (objfile)); + return 1; + } + so_list = so_list->next; + } + return 0; +} diff --git a/gdb/solib-som.h b/gdb/solib-som.h new file mode 100644 index 0000000..e117565 --- /dev/null +++ b/gdb/solib-som.h @@ -0,0 +1,35 @@ +/* Handle SOM shared libraries for GDB, the GNU Debugger. + + Copyright 2004 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. */ + +#ifndef SOLIB_SOM_H +#define SOLIB_SOM_H + +struct objfile; +struct section_offsets; +struct gdbarch_tdep; + +void som_solib_select (struct gdbarch_tdep *tdep); + +int som_solib_section_offsets (struct objfile *objfile, + struct section_offsets *offsets); + +#endif + |