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8a3fe4f86c
Mark up all error and warning messages. * ada-lang.c, amd64-tdep.c, arch-utils.c, breakpoint.c: Update. * bsd-kvm.c, bsd-uthread.c, coff-solib.h, coffread.c: Update. * core-aout.c, core-regset.c, corefile.c, corelow.c: Update. * cp-abi.c, cp-support.c, cp-valprint.c, cris-tdep.c: Update. * dbxread.c, demangle.c, doublest.c, dsrec.c: Update. * dve3900-rom.c, dwarf2expr.c, dwarf2loc.c: Update. * dwarf2read.c, dwarfread.c, elfread.c, eval.c: Update. * event-top.c, exec.c, expprint.c, f-lang.c: Update. * f-typeprint.c, f-valprint.c, fbsd-nat.c, findvar.c: Update. * frame.c, frv-linux-tdep.c, gcore.c, gdbtypes.c: Update. * gnu-nat.c, gnu-v2-abi.c, gnu-v3-abi.c, go32-nat.c: Update. * hpacc-abi.c, hppa-hpux-nat.c, hppa-hpux-tdep.c: Update. * hppa-linux-nat.c, hppa-linux-tdep.c, hppa-tdep.c: Update. * hpread.c, hpux-thread.c, i386-linux-nat.c: Update. * i386-linux-tdep.c, i386-tdep.c, i386bsd-nat.c: Update. * i386gnu-nat.c, i387-tdep.c, ia64-linux-nat.c: Update. * ia64-tdep.c, inf-child.c, inf-ptrace.c, inf-ttrace.c: Update. * infcall.c, infcmd.c, inflow.c, infptrace.c, infrun.c: Update. * inftarg.c, interps.c, irix5-nat.c, jv-lang.c: Update. * kod-cisco.c, kod.c, language.c, libunwind-frame.c: Update. * linespec.c, linux-nat.c, linux-thread-db.c, m2-lang.c: Update. * m32r-rom.c, m68hc11-tdep.c, m68k-tdep.c: Update. * m68klinux-nat.c, macrocmd.c, macroexp.c, main.c: Update. * maint.c, mdebugread.c, mem-break.c, memattr.c: Update. * mips-linux-tdep.c, mips-tdep.c, mipsread.c, monitor.c: Update. * nlmread.c, nto-procfs.c, objc-lang.c, objfiles.c: Update. * observer.c, ocd.c, p-lang.c, p-typeprint.c: Update. * p-valprint.c, pa64solib.c, parse.c, ppc-linux-tdep.c: Update. * ppcnbsd-tdep.c, printcmd.c, procfs.c, remote-e7000.c: Update. * remote-fileio.c, remote-m32r-sdi.c, remote-rdi.c: Update. * remote-rdp.c, remote-sim.c, remote-st.c: Update. * remote-utils.c, remote-utils.h, remote.c: Update. * rom68k-rom.c, rs6000-nat.c, s390-tdep.c, scm-lang.c: Update. * ser-e7kpc.c, ser-tcp.c, ser-unix.c, sh-tdep.c: Update. * sh3-rom.c, shnbsd-tdep.c, sol-thread.c, solib-aix5.c: Update. * solib-frv.c, solib-irix.c, solib-osf.c, solib-pa64.c: Update. * solib-som.c, solib-sunos.c, solib-svr4.c, solib.c: Update. * somread.c, somsolib.c, source.c, stabsread.c: Update. * stack.c, std-regs.c, symfile-mem.c, symfile.c: Update. * symmisc.c, symtab.c, target.c, thread.c, top.c: Update. * tracepoint.c, trad-frame.c, typeprint.c, utils.c: Update. * uw-thread.c, valarith.c, valops.c, valprint.c: Update. * value.c, varobj.c, version.in, win32-nat.c, wince.c: Update. * xcoffread.c, xcoffsolib.c, cli/cli-cmds.c: Update. * cli/cli-decode.c, cli/cli-dump.c, cli/cli-logging.c: Update. * cli/cli-script.c, cli/cli-setshow.c, mi/mi-cmd-break.c: Update. * mi/mi-cmd-disas.c, mi/mi-cmd-env.c, mi/mi-cmd-file.c: Update. * mi/mi-cmd-stack.c, mi/mi-cmd-var.c, mi/mi-getopt.c: Update. * mi/mi-symbol-cmds.c, tui/tui-layout.c, tui/tui-stack.c: Update. * tui/tui-win.c: Update.
236 lines
7.5 KiB
C
236 lines
7.5 KiB
C
/* Reading symbol files from memory.
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Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
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2001, 2002, 2003, 2004 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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This file defines functions (and commands to exercise those
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functions) for reading debugging information from object files
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whose images are mapped directly into the inferior's memory. For
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example, the Linux kernel maps a "syscall DSO" into each process's
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address space; this DSO provides kernel-specific code for some
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system calls.
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At the moment, BFD only has functions for parsing object files from
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memory for the ELF format, even though the general idea isn't
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ELF-specific. This means that BFD only provides the functions GDB
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needs when configured for ELF-based targets. So these functions
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may only be compiled on ELF-based targets.
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GDB has no idea whether it has been configured for an ELF-based
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target or not: it just tries to handle whatever files it is given.
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But this means there are no preprocessor symbols on which we could
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make these functions' compilation conditional.
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So, for the time being, we put these functions alone in this file,
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and have .mt files reference them as appropriate. In the future, I
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hope BFD will provide a format-independent bfd_from_remote_memory
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entry point. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbcore.h"
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#include "objfiles.h"
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#include "exceptions.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "value.h"
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#include "symfile.h"
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#include "observer.h"
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#include "auxv.h"
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#include "elf/common.h"
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/* FIXME: cagney/2005-01-27: Should be a function with the signature:
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int (void *object, const bfd_byte *myaddr, int len). */
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static int
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do_target_read_memory (bfd_vma vma, char *myaddr, int len)
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{
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return target_read_memory (vma, myaddr, len);
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}
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/* Read inferior memory at ADDR to find the header of a loaded object file
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and read its in-core symbols out of inferior memory. TEMPL is a bfd
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representing the target's format. NAME is the name to use for this
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symbol file in messages; it can be NULL or a malloc-allocated string
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which will be attached to the BFD. */
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static struct objfile *
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symbol_file_add_from_memory (struct bfd *templ, CORE_ADDR addr, char *name,
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int from_tty)
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{
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struct objfile *objf;
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struct bfd *nbfd;
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struct bfd_section *sec;
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bfd_vma loadbase;
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struct section_addr_info *sai;
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unsigned int i;
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if (bfd_get_flavour (templ) != bfd_target_elf_flavour)
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error (_("add-symbol-file-from-memory not supported for this target"));
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nbfd = bfd_elf_bfd_from_remote_memory (templ, addr, &loadbase,
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do_target_read_memory);
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if (nbfd == NULL)
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error (_("Failed to read a valid object file image from memory."));
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if (name == NULL)
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nbfd->filename = xstrdup ("shared object read from target memory");
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else
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nbfd->filename = name;
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if (!bfd_check_format (nbfd, bfd_object))
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{
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/* FIXME: should be checking for errors from bfd_close (for one thing,
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on error it does not free all the storage associated with the
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bfd). */
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bfd_close (nbfd);
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error (_("Got object file from memory but can't read symbols: %s."),
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bfd_errmsg (bfd_get_error ()));
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}
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sai = alloc_section_addr_info (bfd_count_sections (nbfd));
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make_cleanup (xfree, sai);
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i = 0;
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for (sec = nbfd->sections; sec != NULL; sec = sec->next)
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if ((bfd_get_section_flags (nbfd, sec) & (SEC_ALLOC|SEC_LOAD)) != 0)
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{
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sai->other[i].addr = bfd_get_section_vma (nbfd, sec) + loadbase;
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sai->other[i].name = (char *) bfd_get_section_name (nbfd, sec);
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sai->other[i].sectindex = sec->index;
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++i;
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}
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objf = symbol_file_add_from_bfd (nbfd, from_tty,
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sai, 0, OBJF_SHARED);
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/* This might change our ideas about frames already looked at. */
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reinit_frame_cache ();
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return objf;
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}
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static void
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add_symbol_file_from_memory_command (char *args, int from_tty)
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{
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CORE_ADDR addr;
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struct bfd *templ;
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if (args == NULL)
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error (_("add-symbol-file-from-memory requires an expression argument"));
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addr = parse_and_eval_address (args);
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/* We need some representative bfd to know the target we are looking at. */
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if (symfile_objfile != NULL)
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templ = symfile_objfile->obfd;
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else
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templ = exec_bfd;
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if (templ == NULL)
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error (_("\
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Must use symbol-file or exec-file before add-symbol-file-from-memory."));
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symbol_file_add_from_memory (templ, addr, NULL, from_tty);
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}
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/* Arguments for symbol_file_add_from_memory_wrapper. */
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struct symbol_file_add_from_memory_args
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{
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struct bfd *bfd;
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CORE_ADDR sysinfo_ehdr;
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char *name;
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int from_tty;
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};
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/* Wrapper function for symbol_file_add_from_memory, for
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catch_exceptions. */
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static int
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symbol_file_add_from_memory_wrapper (struct ui_out *uiout, void *data)
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{
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struct symbol_file_add_from_memory_args *args = data;
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symbol_file_add_from_memory (args->bfd, args->sysinfo_ehdr, args->name,
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args->from_tty);
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return 0;
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}
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/* Try to add the symbols for the vsyscall page, if there is one. This function
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is called via the inferior_created observer. */
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static void
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add_vsyscall_page (struct target_ops *target, int from_tty)
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{
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CORE_ADDR sysinfo_ehdr;
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if (target_auxv_search (target, AT_SYSINFO_EHDR, &sysinfo_ehdr) > 0
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&& sysinfo_ehdr != (CORE_ADDR) 0)
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{
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struct bfd *bfd;
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struct symbol_file_add_from_memory_args args;
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if (core_bfd != NULL)
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bfd = core_bfd;
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else if (exec_bfd != NULL)
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bfd = exec_bfd;
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else
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/* FIXME: cagney/2004-05-06: Should not require an existing
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BFD when trying to create a run-time BFD of the VSYSCALL
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page in the inferior. Unfortunately that's the current
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interface so for the moment bail. Introducing a
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``bfd_runtime'' (a BFD created using the loaded image) file
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format should fix this. */
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{
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warning (_("\
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Could not load vsyscall page because no executable was specified\n\
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try using the \"file\" command first."));
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return;
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}
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args.bfd = bfd;
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args.sysinfo_ehdr = sysinfo_ehdr;
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xasprintf (&args.name, "system-supplied DSO at 0x%s",
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paddr_nz (sysinfo_ehdr));
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/* Pass zero for FROM_TTY, because the action of loading the
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vsyscall DSO was not triggered by the user, even if the user
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typed "run" at the TTY. */
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args.from_tty = 0;
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catch_exceptions (uiout, symbol_file_add_from_memory_wrapper,
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&args, RETURN_MASK_ALL);
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}
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}
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void
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_initialize_symfile_mem (void)
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{
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add_cmd ("add-symbol-file-from-memory", class_files,
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add_symbol_file_from_memory_command,
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"\
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Load the symbols out of memory from a dynamically loaded object file.\n\
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Give an expression for the address of the file's shared object file header.",
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&cmdlist);
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/* Want to know of each new inferior so that its vsyscall info can
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be extracted. */
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observer_attach_inferior_created (add_vsyscall_page);
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}
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