* amd64-tdep.c (amd64_sigtramp_frame_sniffer): Rewrite to use new

sigtramp_p member of `struct gdbarch_tdep'.  Also check whether
the program counter is in the range specified by `struct
gdbarch_tdep'.
* amd64-linux-tdep.c: Include "symtab.h".
(amd64_linux_pc_in_sigtramp): Remove function.
(amd64_linux_sigtramp_p): New function.
(amd64_linux_init_abi): Initialize TDEP->sigtramp_p.  Don't set
deprecated_pc_in_sigtramp.
* amd64nbsd-tdep.c: Include "symtab.h".
(amd64nbsd_sigtramp_p): New function.
(amd64nbsd_init_abi): Initialize TDEP->sigtramp_p.  Don't set
deprecated_pc_in_sigtramp.
* amd64obsd-tdep.c: Include "symtab.h" and "objfiles.h".  Add a
few comments.
(amd64obsd_pc_in_sigtramp): Remove function.
(amd64obsd_sigtramp_p): New function.
(amd64obsd_init_abi): Initialize TDEP->sigtramp_p.  Don't set
deprecated_pc_in_sigtramp.
* i386-tdep.h (struct gdbarch_tdep): Add sigtramp_p member.
(i386bsd_pc_ins_sigtramp): Remove prototype.
(i386bsd_sigtramp_start, i386bsd_sigtramp_end): Remove prototypes.
* i386-tdep.c (i386_sigtramp_frame_sniffer): Rewrite to use new
sigtramp_p member of `struct gdbarch_tdep'.  Also check whether
the program counter is in the range specified by `struct
gdbarch_tdep'.
(i386_pc_in_sigtramp, i386_svr4_pc_in_sigtramp): Remove functions.
(i386_sigtramp_p, i386_svr4_sigtramp_p): New functions.
(i386_go32_pc_in_sigtramp): Remove function.
(i386_svr4_init_abi): Don't set deprecated_pc_in_sigtramp.
Initialize TDEP->sigtramp_p.
(i386_go32_init_abi): Initialize TDEP->sigtramp_p to NULL.
(i386_gdbarch_init): Initialize TDEP->sigtramp_p.  Don't set
deprecated_pc_in_sigtramp.
* i386-linux-tdep.c: Adjust comments.
(i386_linux_pc_in_sigtramp): Remove function.
(i386_linux_sigtramp_p): New function.
(i386_linux_init_abi): Initialize TDEP->sigtramp_p.  Don't set
deprecated_pc_in_sigtramp.
* i386-nto-tdep.c: Update copyright year.
(i386nto_pc_in_sigtramp): Remove function.
(i386nto_sigtramp_p): New function.
(i386nto_sigcontext_addr): Use I386_ESP_REGNUM instead of
SP_REGNUM.
(i386nto_init_abi): Initialize TDEP->sigtramp_p.  Don't set
deprecated_pc_in_sigtramp.
* i386-sol2-tdep.c: Update copyright year.
(i386_sol2_pc_in_sigtramp): Remove function.
(i386_sol2_sigtramp_p): New function.
(i386_sol2_init_abi): Initialize TDEP->sigtramp_p.  Don't set
deprecated_pc_in_sigtramp.
* i386bsd-tdep.c (i386bsd_pc_in_sigtramp): Remove function.
(i386bsd_sigtramp_start, i386bsd_sigtramp_end): Remove functions.
(i386bsd_init_abi): Don't set deprecated_pc_in_sigtramp,
deprecated_sigtramp_start and deprecated_sigtramp_end.
* i386nbsd-tdep.c: Include "frame.h" and "symtab.h".
(i386nbsd_pc_in_sigtramp): Remove function.
(i386nbsd_sigtramp_p): New function.
(i386nbsd_init_abi): Don't set deprecated_pc_in_sigtramp,
deprecated_sigtramp_start, deprecated_sigtramp_end.  Initialize
TDEP->sigtramp_start, TDEP->sigtramp_end and TDEP->sigtramp_p.
* i386obsd-tdep.c: Include "frame.h", "symtab.h" and "objfiles.h".
(i386obsd_pc_in_sigtramp): Remove function.
(i386obsd_sigtramp_p): New function.
(i386obsd_sigtramp_start, i386obsd_sigtramp_end): Remove
functions.
(i386bsd_init_abi): Don't set deprecated_pc_in_sigtramp,
deprecated_sigtramp_start, deprecated_sigtramp_end.  Initialize
TDEP->sigtramp_p.
* Makefile.in (amd64-linux-tdep.o, amd64nbsd-tdep.o,
amd64obsd-tdep.o, i386nbsd-tdep.o, i386obsd-tdep.o): Update
dependencies.

gdb/i386-linux-tdep.c

@@ -83,13 +83,13 @@ i386_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 
    Checking for the code sequence should be somewhat reliable, because
    the effect is to call the system call sigreturn.  This is unlikely
-   to occur anywhere other than a signal trampoline.
+   to occur anywhere other than in a signal trampoline.
 
    It kind of sucks that we have to read memory from the process in
    order to identify a signal trampoline, but there doesn't seem to be
-   any other way.  The DEPRECATED_PC_IN_SIGTRAMP macro in tm-linux.h
-   arranges to only call us if no function name could be identified,
-   which should be the case since the code is on the stack.
+   any other way.  Therefore we only do the memory reads if no
+   function name could be identified, which should be the case since
+   the code is on the stack.
 
    Detection of signal trampolines for handlers that set the
    SA_RESTORER flag is in general not possible.  Unfortunately this is
@@ -217,11 +217,17 @@ i386_linux_rt_sigtramp_start (CORE_ADDR pc)
   return pc;
 }
 
-/* Return whether PC is in a GNU/Linux sigtramp routine.  */
+/* Return whether the frame preciding NEXT_FRAME corresponds to a
+   GNU/Linux sigtramp routine.  */
 
 static int
-i386_linux_pc_in_sigtramp (CORE_ADDR pc, char *name)
+i386_linux_sigtramp_p (struct frame_info *next_frame)
 {
+  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  char *name;
+
+  find_pc_partial_function (pc, &name, NULL, NULL);
+
   /* If we have NAME, we can optimize the search.  The trampolines are
      named __restore and __restore_rt.  However, they aren't dynamically
      exported from the shared C library, so the trampoline may appear to
@@ -394,16 +400,11 @@ i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   tdep->jb_pc_offset = 20;	/* From <bits/setjmp.h>.  */
 
+  tdep->sigtramp_p = i386_linux_sigtramp_p;
   tdep->sigcontext_addr = i386_linux_sigcontext_addr;
   tdep->sc_reg_offset = i386_linux_sc_reg_offset;
   tdep->sc_num_regs = ARRAY_SIZE (i386_linux_sc_reg_offset);
 
-  /* When the i386 Linux kernel calls a signal handler, the return
-     address points to a bit of code on the stack.  This function is
-     used to identify this bit of code as a signal trampoline in order
-     to support backtracing through calls to signal handlers.  */
-  set_gdbarch_deprecated_pc_in_sigtramp (gdbarch, i386_linux_pc_in_sigtramp);
-
   /* GNU/Linux uses SVR4-style shared libraries.  */
   set_solib_svr4_fetch_link_map_offsets
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);