diff options
Diffstat (limited to 'gdb/solib-svr4.c')
| -rw-r--r-- | gdb/solib-svr4.c | 45 |
1 files changed, 37 insertions, 8 deletions
diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c index 7fda5e4..ff35ba9 100644 --- a/gdb/solib-svr4.c +++ b/gdb/solib-svr4.c @@ -1,7 +1,7 @@ /* Handle SVR4 shared libraries for GDB, the GNU Debugger. - Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, - 2001 - Free Software Foundation, Inc. + + Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, + 2000, 2001, 2003 Free Software Foundation, Inc. This file is part of GDB. @@ -37,6 +37,9 @@ #include "solist.h" #include "solib-svr4.h" +#include "bfd-target.h" +#include "exec.h" + #ifndef SVR4_FETCH_LINK_MAP_OFFSETS #define SVR4_FETCH_LINK_MAP_OFFSETS() svr4_fetch_link_map_offsets () #endif @@ -911,6 +914,24 @@ svr4_in_dynsym_resolve_code (CORE_ADDR pc) || in_plt_section (pc, NULL)); } +/* Given an executable's ABFD and target, compute the entry-point + address. */ + +static CORE_ADDR +exec_entry_point (struct bfd *abfd, struct target_ops *targ) +{ + /* KevinB wrote ... for most targets, the address returned by + bfd_get_start_address() is the entry point for the start + function. But, for some targets, bfd_get_start_address() returns + the address of a function descriptor from which the entry point + address may be extracted. This address is extracted by + gdbarch_convert_from_func_ptr_addr(). The method + gdbarch_convert_from_func_ptr_addr() is the merely the identify + function for targets which don't use function descriptors. */ + return gdbarch_convert_from_func_ptr_addr (current_gdbarch, + bfd_get_start_address (abfd), + targ); +} /* @@ -984,6 +1005,7 @@ enable_break (void) int load_addr_found = 0; struct so_list *inferior_sos; bfd *tmp_bfd = NULL; + struct target_ops *tmp_bfd_target; int tmp_fd = -1; char *tmp_pathname = NULL; CORE_ADDR sym_addr = 0; @@ -1019,6 +1041,11 @@ enable_break (void) goto bkpt_at_symbol; } + /* Now convert the TMP_BFD into a target. That way target, as + well as BFD operations can be used. Note that closing the + target will also close the underlying bfd. */ + tmp_bfd_target = target_bfd_reopen (tmp_bfd); + /* If the entry in _DYNAMIC for the dynamic linker has already been filled in, we can read its base address from there. */ inferior_sos = svr4_current_sos (); @@ -1042,7 +1069,8 @@ enable_break (void) the current pc (which should point at the entry point for the dynamic linker) and subtracting the offset of the entry point. */ if (!load_addr_found) - load_addr = read_pc () - tmp_bfd->start_address; + load_addr = (read_pc () + - exec_entry_point (tmp_bfd, tmp_bfd_target)); /* Record the relocated start and end address of the dynamic linker text and plt section for svr4_in_dynsym_resolve_code. */ @@ -1080,8 +1108,9 @@ enable_break (void) break; } - /* We're done with the temporary bfd. */ - bfd_close (tmp_bfd); + /* We're done with both the temporary bfd and target. Remember, + closing the target closes the underlying bfd. */ + target_close (tmp_bfd_target, 0); if (sym_addr != 0) { @@ -1200,7 +1229,7 @@ svr4_relocate_main_executable (void) interp_sect = bfd_get_section_by_name (exec_bfd, ".interp"); if (interp_sect == NULL && (bfd_get_file_flags (exec_bfd) & DYNAMIC) != 0 - && bfd_get_start_address (exec_bfd) != pc) + && (exec_entry_point (exec_bfd, &exec_ops) != pc)) { struct cleanup *old_chain; struct section_offsets *new_offsets; @@ -1232,7 +1261,7 @@ svr4_relocate_main_executable (void) The same language also appears in Edition 4.0 of the System V ABI and is left unspecified in some of the earlier editions. */ - displacement = pc - bfd_get_start_address (exec_bfd); + displacement = pc - exec_entry_point (exec_bfd, &exec_ops); changed = 0; new_offsets = xcalloc (symfile_objfile->num_sections, |