2004-06-09 Andrew Cagney <cagney@gnu.org>
* solib-svr4.c [HANDLE_SVR4_EXEC_EMULATORS]: Delete #ifdef code.
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Andrew Cagney
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@ -1,5 +1,7 @@
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2004-06-09 Andrew Cagney <cagney@gnu.org>
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* solib-svr4.c [HANDLE_SVR4_EXEC_EMULATORS]: Delete #ifdef code.
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* config/ia64/tm-linux.h (TARGET_ELF64): Delete macro, Update
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copyright.
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* config/ia64/tm-aix.h (TARGET_ELF64): Ditto.
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132
gdb/solib-svr4.c
132
gdb/solib-svr4.c
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@ -272,133 +272,6 @@ bfd_lookup_symbol (bfd *abfd, char *symname, flagword sect_flags)
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return symaddr;
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}
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#ifdef HANDLE_SVR4_EXEC_EMULATORS
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/*
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Solaris BCP (the part of Solaris which allows it to run SunOS4
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a.out files) throws in another wrinkle. Solaris does not fill
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in the usual a.out link map structures when running BCP programs,
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the only way to get at them is via groping around in the dynamic
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linker.
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The dynamic linker and it's structures are located in the shared
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C library, which gets run as the executable's "interpreter" by
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the kernel.
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Note that we can assume nothing about the process state at the time
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we need to find these structures. We may be stopped on the first
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instruction of the interpreter (C shared library), the first
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instruction of the executable itself, or somewhere else entirely
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(if we attached to the process for example).
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*/
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static char *debug_base_symbols[] =
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{
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"r_debug", /* Solaris 2.3 */
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"_r_debug", /* Solaris 2.1, 2.2 */
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NULL
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};
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static int look_for_base (int, CORE_ADDR);
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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 debug base symbol 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 (int fd, CORE_ADDR baseaddr)
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{
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bfd *interp_bfd;
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CORE_ADDR address = 0;
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char **symbolp;
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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
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|| (exec_bfd != NULL
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&& fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd)))
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{
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return (0);
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}
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/* Try to open whatever random file this fd corresponds to. Note that
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we have no way currently to find the filename. Don't gripe about
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any problems we might have, just fail. */
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if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL)
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{
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return (0);
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}
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if (!bfd_check_format (interp_bfd, bfd_object))
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{
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/* FIXME-leak: on failure, might not free all memory associated with
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interp_bfd. */
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bfd_close (interp_bfd);
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return (0);
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}
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/* Now try to find our debug base symbol in this file, which we at
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least know to be a valid ELF executable or shared library. */
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for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
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{
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address = bfd_lookup_symbol (interp_bfd, *symbolp, 0);
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if (address != 0)
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{
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break;
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}
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}
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if (address == 0)
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{
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/* FIXME-leak: on failure, might not free all memory associated with
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interp_bfd. */
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bfd_close (interp_bfd);
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return (0);
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}
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/* Eureka! We found the symbol. But now we may need to relocate it
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by the base address. If the symbol's value is less than the base
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address of the shared library, then it hasn't yet been relocated
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by the dynamic linker, and we have to do it ourself. FIXME: Note
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that we make the assumption that the first segment that corresponds
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to the shared library has the base address to which the library
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was relocated. */
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if (address < baseaddr)
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{
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address += baseaddr;
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}
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debug_base = address;
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/* FIXME-leak: on failure, might not free all memory associated with
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interp_bfd. */
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bfd_close (interp_bfd);
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return (1);
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}
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#endif /* HANDLE_SVR4_EXEC_EMULATORS */
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/*
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LOCAL FUNCTION
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@ -579,11 +452,6 @@ locate_base (void)
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if (exec_bfd != NULL
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&& bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour)
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debug_base = elf_locate_base ();
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#ifdef HANDLE_SVR4_EXEC_EMULATORS
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/* Try it the hard way for emulated executables. */
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else if (!ptid_equal (inferior_ptid, null_ptid) && target_has_execution)
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proc_iterate_over_mappings (look_for_base);
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#endif
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}
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return (debug_base);
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}
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