--- /dev/null
+Status: Checked in to HEAD after 6.3.
+
+2004-11-07 Andrew Cagney <cagney@redhat.com>
+ Daniel Jacobowitz <dan@debian.org>
+ Roland McGrath <roland@redhat.com>
+
+ * Makefile.in (symfile-mem.o): Update dependencies.
+ * i386-linux-tdep.c (i386_linux_dwarf_signal_frame_p): New.
+ (i386_linux_init_abi): Call dwarf2_frame_set_signal_frame_p.
+ * inf-ptrace.c (inf_ptrace_attach): Call
+ observer_notify_inferior_created.
+ * inftarg.c (child_attach): Likewise.
+ * symfile-mem.c: Include "observer.h", "auxv.h", and "elf/common.h".
+ (symbol_file_add_from_memory): Take NAME argument. Use it for
+ the new BFD's filename.
+ (add_symbol_file_from_memory_command): Update call to
+ symbol_file_add_from_memory.
+ (struct symbol_file_add_from_memory_args, add_vsyscall_page)
+ (symbol_file_add_from_memory_wrapper): New.
+ (_initialize_symfile_mem): Register add_vsyscall_page as an
+ inferior_created observer.
+
+Index: gdb-6.3/gdb/i386-linux-tdep.c
+===================================================================
+--- gdb-6.3.orig/gdb/i386-linux-tdep.c 2004-08-06 16:58:28.000000000 -0400
++++ gdb-6.3/gdb/i386-linux-tdep.c 2004-11-10 00:55:06.669398770 -0500
+@@ -27,6 +27,7 @@
+ #include "inferior.h"
+ #include "osabi.h"
+ #include "reggroups.h"
++#include "dwarf2-frame.h"
+
+ #include "gdb_string.h"
+
+@@ -244,6 +245,27 @@ i386_linux_sigtramp_p (struct frame_info
+ || strcmp ("__restore_rt", name) == 0);
+ }
+
++/* Return one if the unwound PC from NEXT_FRAME is in a signal trampoline
++ which may have DWARF-2 CFI. */
++
++static int
++i386_linux_dwarf_signal_frame_p (struct gdbarch *gdbarch,
++ struct frame_info *next_frame)
++{
++ CORE_ADDR pc = frame_pc_unwind (next_frame);
++ char *name;
++
++ find_pc_partial_function (pc, &name, NULL, NULL);
++
++ /* If a vsyscall DSO is in use, the signal trampolines may have these
++ names. */
++ if (name && (strcmp (name, "__kernel_sigreturn") == 0
++ || strcmp (name, "__kernel_rt_sigreturn") == 0))
++ return 1;
++
++ return 0;
++}
++
+ /* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
+ #define I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 20
+
+@@ -414,6 +436,8 @@ i386_linux_init_abi (struct gdbarch_info
+
+ /* GNU/Linux uses the dynamic linker included in the GNU C Library. */
+ set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
++
++ dwarf2_frame_set_signal_frame_p (gdbarch, i386_linux_dwarf_signal_frame_p);
+ }
+
+ /* Provide a prototype to silence -Wmissing-prototypes. */
+Index: gdb-6.3/gdb/inf-ptrace.c
+===================================================================
+--- gdb-6.3.orig/gdb/inf-ptrace.c 2004-10-15 09:29:33.000000000 -0400
++++ gdb-6.3/gdb/inf-ptrace.c 2004-11-10 00:53:43.697615843 -0500
+@@ -220,6 +220,10 @@ inf_ptrace_attach (char *args, int from_
+
+ inferior_ptid = pid_to_ptid (pid);
+ push_target (ptrace_ops_hack);
++
++ /* Do this first, before anything has had a chance to query the
++ inferior's symbol table or similar. */
++ observer_notify_inferior_created (¤t_target, from_tty);
+ }
+
+ static void
+Index: gdb-6.3/gdb/inftarg.c
+===================================================================
+--- gdb-6.3.orig/gdb/inftarg.c 2004-10-08 16:29:47.000000000 -0400
++++ gdb-6.3/gdb/inftarg.c 2004-11-10 00:53:43.711613107 -0500
+@@ -211,6 +211,10 @@ child_attach (char *args, int from_tty)
+
+ inferior_ptid = pid_to_ptid (pid);
+ push_target (&deprecated_child_ops);
++
++ /* Do this first, before anything has had a chance to query the
++ inferior's symbol table or similar. */
++ observer_notify_inferior_created (¤t_target, from_tty);
+ }
+
+ #if !defined(CHILD_POST_ATTACH)
+Index: gdb-6.3/gdb/symfile-mem.c
+===================================================================
+--- gdb-6.3.orig/gdb/symfile-mem.c 2004-07-17 10:24:07.000000000 -0400
++++ gdb-6.3/gdb/symfile-mem.c 2004-11-10 00:53:43.722610958 -0500
+@@ -52,13 +52,19 @@
+ #include "target.h"
+ #include "value.h"
+ #include "symfile.h"
++#include "observer.h"
++#include "auxv.h"
++#include "elf/common.h"
+
+
+ /* Read inferior memory at ADDR to find the header of a loaded object file
+ and read its in-core symbols out of inferior memory. TEMPL is a bfd
+- representing the target's format. */
++ representing the target's format. NAME is the name to use for this
++ symbol file in messages; it can be NULL or a malloc-allocated string
++ which will be attached to the BFD. */
+ static struct objfile *
+-symbol_file_add_from_memory (struct bfd *templ, CORE_ADDR addr, int from_tty)
++symbol_file_add_from_memory (struct bfd *templ, CORE_ADDR addr, char *name,
++ int from_tty)
+ {
+ struct objfile *objf;
+ struct bfd *nbfd;
+@@ -75,7 +81,10 @@ symbol_file_add_from_memory (struct bfd
+ if (nbfd == NULL)
+ error ("Failed to read a valid object file image from memory.");
+
+- nbfd->filename = xstrdup ("shared object read from target memory");
++ if (name == NULL)
++ nbfd->filename = xstrdup ("shared object read from target memory");
++ else
++ nbfd->filename = name;
+
+ if (!bfd_check_format (nbfd, bfd_object))
+ {
+@@ -129,7 +138,73 @@ add_symbol_file_from_memory_command (cha
+ error ("\
+ Must use symbol-file or exec-file before add-symbol-file-from-memory.");
+
+- symbol_file_add_from_memory (templ, addr, from_tty);
++ symbol_file_add_from_memory (templ, addr, NULL, from_tty);
++}
++
++/* Arguments for symbol_file_add_from_memory_wrapper. */
++
++struct symbol_file_add_from_memory_args
++{
++ struct bfd *bfd;
++ CORE_ADDR sysinfo_ehdr;
++ char *name;
++ int from_tty;
++};
++
++/* Wrapper function for symbol_file_add_from_memory, for
++ catch_exceptions. */
++
++static int
++symbol_file_add_from_memory_wrapper (struct ui_out *uiout, void *data)
++{
++ struct symbol_file_add_from_memory_args *args = data;
++
++ symbol_file_add_from_memory (args->bfd, args->sysinfo_ehdr, args->name,
++ args->from_tty);
++ return 0;
++}
++
++/* Try to add the symbols for the vsyscall page, if there is one. This function
++ is called via the inferior_created observer. */
++
++static void
++add_vsyscall_page (struct target_ops *target, int from_tty)
++{
++ CORE_ADDR sysinfo_ehdr;
++
++ if (target_auxv_search (target, AT_SYSINFO_EHDR, &sysinfo_ehdr) > 0
++ && sysinfo_ehdr != (CORE_ADDR) 0)
++ {
++ struct bfd *bfd;
++ struct symbol_file_add_from_memory_args args;
++
++ if (core_bfd != NULL)
++ bfd = core_bfd;
++ else if (exec_bfd != NULL)
++ bfd = exec_bfd;
++ else
++ /* FIXME: cagney/2004-05-06: Should not require an existing
++ BFD when trying to create a run-time BFD of the VSYSCALL
++ page in the inferior. Unfortunately that's the current
++ interface so for the moment bail. Introducing a
++ ``bfd_runtime'' (a BFD created using the loaded image) file
++ format should fix this. */
++ {
++ warning ("could not load vsyscall page because no executable was specified");
++ warning ("try using the \"file\" command first");
++ return;
++ }
++ args.bfd = bfd;
++ args.sysinfo_ehdr = sysinfo_ehdr;
++ xasprintf (&args.name, "system-supplied DSO at 0x%s",
++ paddr_nz (sysinfo_ehdr));
++ /* Pass zero for FROM_TTY, because the action of loading the
++ vsyscall DSO was not triggered by the user, even if the user
++ typed "run" at the TTY. */
++ args.from_tty = 0;
++ catch_exceptions (uiout, symbol_file_add_from_memory_wrapper,
++ &args, NULL, RETURN_MASK_ALL);
++ }
+ }
+
+ \f
+@@ -143,4 +218,7 @@ Load the symbols out of memory from a dy
+ Give an expression for the address of the file's shared object file header.",
+ &cmdlist);
+
++ /* Want to know of each new inferior so that its vsyscall info can
++ be extracted. */
++ observer_attach_inferior_created (add_vsyscall_page);
+ }
+Index: gdb-6.3/gdb/Makefile.in
+===================================================================
+--- gdb-6.3.orig/gdb/Makefile.in 2004-11-10 00:29:00.000000000 -0500
++++ gdb-6.3/gdb/Makefile.in 2004-11-10 00:54:47.728100986 -0500
+@@ -2020,7 +2020,7 @@ i386-linux-nat.o: i386-linux-nat.c $(def
+ i386-linux-tdep.o: i386-linux-tdep.c $(defs_h) $(gdbcore_h) $(frame_h) \
+ $(value_h) $(regcache_h) $(inferior_h) $(osabi_h) $(reggroups_h) \
+ $(gdb_string_h) $(i386_tdep_h) $(i386_linux_tdep_h) $(glibc_tdep_h) \
+- $(solib_svr4_h)
++ $(solib_svr4_h) $(dwarf2_frame_h)
+ i386ly-tdep.o: i386ly-tdep.c $(defs_h) $(gdbcore_h) $(inferior_h) \
+ $(regcache_h) $(target_h) $(osabi_h) $(i386_tdep_h)
+ i386-nat.o: i386-nat.c $(defs_h) $(breakpoint_h) $(command_h) $(gdbcmd_h)
+@@ -2606,7 +2606,8 @@ symfile.o: symfile.c $(defs_h) $(bfdlink
+ $(hashtab_h) $(readline_h) $(gdb_assert_h) $(block_h) \
+ $(gdb_string_h) $(gdb_stat_h)
+ symfile-mem.o: symfile-mem.c $(defs_h) $(symtab_h) $(gdbcore_h) \
+- $(objfiles_h) $(gdbcmd_h) $(target_h) $(value_h) $(symfile_h)
++ $(objfiles_h) $(gdbcmd_h) $(target_h) $(value_h) $(symfile_h) \
++ $(observer_h) $(auxv_h) $(elf_common_h)
+ symmisc.o: symmisc.c $(defs_h) $(symtab_h) $(gdbtypes_h) $(bfd_h) \
+ $(symfile_h) $(objfiles_h) $(breakpoint_h) $(command_h) \
+ $(gdb_obstack_h) $(language_h) $(bcache_h) $(block_h) $(gdb_regex_h) \
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