Re: [PATCH] [PR gdb/23093] Implementation of "gdbarch_gdb_signal_to/from_target" on FreeBSD

[John Baldwin <jhb at freebsd dot org>]

On Saturday, May 05, 2018 11:15:20 AM Rajendra SY wrote:
> John,
> 
> Thanks for the review comments.
> > Do you have a copyright assignment on file for contributions to GDB?
> No
> 
> Would you please commit this patch?

I think this change is probably large enough to need a copyright assignment
before it can go upstream.  Can you fill one out and let me know when it is
filed?  Then I can push this in.

> Thanks
> Rajendra
> 
> 
> On Sat, May 5, 2018 at 12:01 AM, John Baldwin <jhb@freebsd.org> wrote:
> > On Friday, April 27, 2018 08:55:03 AM Rajendra SY wrote:
> >> Resending the same patch for review comments.
> >>
> >> Problem:
> >> The $_exitsignal internal variable does not get updated on FreeBSD platform.
> >>
> >> Cause:
> >> FreeBSD target is missing signal mapping functions
> >> "gdb_signal_to_target" & "gdb_signal_from_target".
> >> The code flow gdb/infrun.c:5075 [a call to
> >> gdbarch_gdb_signal_to_target_p()] tries to find out if the target has
> >> these functions. In case of FreeBSD it is not so it just skips
> >> updating '$_exitsignal' variable.
> >>
> >> The attached patch implements these functions to provide correct
> >> FreeBSD signal to GDB signal mapping information.
> >>
> >> Tests:
> >> FAIL: gdb.base/exitsignal.exp: $_exitsignal is 11 (SIGSEGV) after SIGSEGV.
> >> FAIL: gdb.base/exitsignal.exp: $_exitsignal is 11 (SIGSEGV) after
> >> restarting the inferior
> >>
> >> These above currently failing tests will pass with this fix.
> >>
> >> gdb/ChangeLog:
> >> 2018-04-27  Rajendra SY  <rajendra.sy@gmail.com>
> >>
> >>         PR gdb/23093
> >>         * gdb/fbsd-tdep.c (enum gdb_signal):
> >>         (fbsd_gdb_signal_from_target):
> >>         (fbsd_gdb_signal_to_target):
> >>         (fbsd_init_abi):
> >
> > Thanks, I've tested this change and I have some small changes to it below.  Do
> > you have a copyright assignment on file for contributions to GDB?
> >
> > From 4346c0567fd137f845cdc46c0a0d8f6047db0ec9 Mon Sep 17 00:00:00 2001
> > From: Rajendra SY <rajendra.sy@gmail.com>
> > Date: Wed, 2 May 2018 11:04:24 -0700
> > Subject: [PATCH] Implement the "gdb_signal_to/from_target" gdbarch methods for
> >  FreeBSD.
> >
> > This fixes failures in the gdb.base/exitsignal.exp test.
> >
> > gdb/ChangeLog:
> >
> >         PR gdb/23093
> >         * gdb/fbsd-tdep.c (fbsd_gdb_signal_from_target)
> >         (fbsd_gdb_signal_to_target): New.
> >         (fbsd_init_abi): Install gdbarch "signal_from_target" and
> >         "signal_to_target" methods.
> > ---
> >  gdb/ChangeLog   |   8 ++
> >  gdb/fbsd-tdep.c | 282 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 290 insertions(+)
> >
> > diff --git a/gdb/ChangeLog b/gdb/ChangeLog
> > index f326c8e2d3..46c474b612 100644
> > --- a/gdb/ChangeLog
> > +++ b/gdb/ChangeLog
> > @@ -1,3 +1,11 @@
> > +2018-05-02  Rajendra SY  <rajendra.sy@gmail.com>
> > +
> > +       PR gdb/23093
> > +       * gdb/fbsd-tdep.c (fbsd_gdb_signal_from_target)
> > +       (fbsd_gdb_signal_to_target): New.
> > +       (fbsd_init_abi): Install gdbarch "signal_from_target" and
> > +       "signal_to_target" methods.
> > +
> >  2018-05-02  Tom Tromey  <tom@tromey.com>
> >
> >         PR python/20084:
> > diff --git a/gdb/fbsd-tdep.c b/gdb/fbsd-tdep.c
> > index e49a9aff09..6703cd698d 100644
> > --- a/gdb/fbsd-tdep.c
> > +++ b/gdb/fbsd-tdep.c
> > @@ -29,6 +29,46 @@
> >  #include "elf-bfd.h"
> >  #include "fbsd-tdep.h"
> >
> > +/* This enum is derived from FreeBSD's <sys/signal.h>.  */
> > +
> > +enum
> > +  {
> > +    FREEBSD_SIGHUP = 1,
> > +    FREEBSD_SIGINT = 2,
> > +    FREEBSD_SIGQUIT = 3,
> > +    FREEBSD_SIGILL = 4,
> > +    FREEBSD_SIGTRAP = 5,
> > +    FREEBSD_SIGABRT = 6,
> > +    FREEBSD_SIGEMT = 7,
> > +    FREEBSD_SIGFPE = 8,
> > +    FREEBSD_SIGKILL = 9,
> > +    FREEBSD_SIGBUS = 10,
> > +    FREEBSD_SIGSEGV = 11,
> > +    FREEBSD_SIGSYS = 12,
> > +    FREEBSD_SIGPIPE = 13,
> > +    FREEBSD_SIGALRM = 14,
> > +    FREEBSD_SIGTERM = 15,
> > +    FREEBSD_SIGURG = 16,
> > +    FREEBSD_SIGSTOP = 17,
> > +    FREEBSD_SIGTSTP = 18,
> > +    FREEBSD_SIGCONT = 19,
> > +    FREEBSD_SIGCHLD = 20,
> > +    FREEBSD_SIGTTIN = 21,
> > +    FREEBSD_SIGTTOU = 22,
> > +    FREEBSD_SIGIO = 23,
> > +    FREEBSD_SIGXCPU = 24,
> > +    FREEBSD_SIGXFSZ = 25,
> > +    FREEBSD_SIGVTALRM = 26,
> > +    FREEBSD_SIGPROF = 27,
> > +    FREEBSD_SIGWINCH = 28,
> > +    FREEBSD_SIGINFO = 29,
> > +    FREEBSD_SIGUSR1 = 30,
> > +    FREEBSD_SIGUSR2 = 31,
> > +    FREEBSD_SIGTHR = 32,
> > +    FREEBSD_SIGLIBRT = 33,
> > +    FREEBSD_SIGRTMIN = 65,
> > +    FREEBSD_SIGRTMAX = 126,
> > +  };
> >
> >  /* FreeBSD kernels 12.0 and later include a copy of the
> >     'ptrace_lwpinfo' structure returned by the PT_LWPINFO ptrace
> > @@ -1143,6 +1183,246 @@ fbsd_get_siginfo_type (struct gdbarch *gdbarch)
> >    return siginfo_type;
> >  }
> >
> > +/* Implement the "gdb_signal_from_target" gdbarch method.  */
> > +
> > +static enum gdb_signal
> > +fbsd_gdb_signal_from_target (struct gdbarch *gdbarch, int signal)
> > +{
> > +  switch (signal)
> > +    {
> > +    case 0:
> > +      return GDB_SIGNAL_0;
> > +
> > +    case FREEBSD_SIGHUP:
> > +      return GDB_SIGNAL_HUP;
> > +
> > +    case FREEBSD_SIGINT:
> > +      return GDB_SIGNAL_INT;
> > +
> > +    case FREEBSD_SIGQUIT:
> > +      return GDB_SIGNAL_QUIT;
> > +
> > +    case FREEBSD_SIGILL:
> > +      return GDB_SIGNAL_ILL;
> > +
> > +    case FREEBSD_SIGTRAP:
> > +      return GDB_SIGNAL_TRAP;
> > +
> > +    case FREEBSD_SIGABRT:
> > +      return GDB_SIGNAL_ABRT;
> > +
> > +    case FREEBSD_SIGEMT:
> > +      return GDB_SIGNAL_EMT;
> > +
> > +    case FREEBSD_SIGFPE:
> > +      return GDB_SIGNAL_FPE;
> > +
> > +    case FREEBSD_SIGKILL:
> > +      return GDB_SIGNAL_KILL;
> > +
> > +    case FREEBSD_SIGBUS:
> > +      return GDB_SIGNAL_BUS;
> > +
> > +    case FREEBSD_SIGSEGV:
> > +      return GDB_SIGNAL_SEGV;
> > +
> > +    case FREEBSD_SIGSYS:
> > +      return GDB_SIGNAL_SYS;
> > +
> > +    case FREEBSD_SIGPIPE:
> > +      return GDB_SIGNAL_PIPE;
> > +
> > +    case FREEBSD_SIGALRM:
> > +      return GDB_SIGNAL_ALRM;
> > +
> > +    case FREEBSD_SIGTERM:
> > +      return GDB_SIGNAL_TERM;
> > +
> > +    case FREEBSD_SIGURG:
> > +      return GDB_SIGNAL_URG;
> > +
> > +    case FREEBSD_SIGSTOP:
> > +      return GDB_SIGNAL_STOP;
> > +
> > +    case FREEBSD_SIGTSTP:
> > +      return GDB_SIGNAL_TSTP;
> > +
> > +    case FREEBSD_SIGCONT:
> > +      return GDB_SIGNAL_CONT;
> > +
> > +    case FREEBSD_SIGCHLD:
> > +      return GDB_SIGNAL_CHLD;
> > +
> > +    case FREEBSD_SIGTTIN:
> > +      return GDB_SIGNAL_TTIN;
> > +
> > +    case FREEBSD_SIGTTOU:
> > +      return GDB_SIGNAL_TTOU;
> > +
> > +    case FREEBSD_SIGIO:
> > +      return GDB_SIGNAL_IO;
> > +
> > +    case FREEBSD_SIGXCPU:
> > +      return GDB_SIGNAL_XCPU;
> > +
> > +    case FREEBSD_SIGXFSZ:
> > +      return GDB_SIGNAL_XFSZ;
> > +
> > +    case FREEBSD_SIGVTALRM:
> > +      return GDB_SIGNAL_VTALRM;
> > +
> > +    case FREEBSD_SIGPROF:
> > +      return GDB_SIGNAL_PROF;
> > +
> > +    case FREEBSD_SIGWINCH:
> > +      return GDB_SIGNAL_WINCH;
> > +
> > +    case FREEBSD_SIGINFO:
> > +      return GDB_SIGNAL_INFO;
> > +
> > +    case FREEBSD_SIGUSR1:
> > +      return GDB_SIGNAL_USR1;
> > +
> > +    case FREEBSD_SIGUSR2:
> > +      return GDB_SIGNAL_USR2;
> > +
> > +    /* SIGTHR is the same as SIGLWP on FreeBSD. */
> > +    case FREEBSD_SIGTHR:
> > +      return GDB_SIGNAL_LWP;
> > +
> > +    case FREEBSD_SIGLIBRT:
> > +      return GDB_SIGNAL_LIBRT;
> > +    }
> > +
> > +  if (signal >= FREEBSD_SIGRTMIN && signal <= FREEBSD_SIGRTMAX)
> > +    {
> > +      int offset = signal - FREEBSD_SIGRTMIN;
> > +
> > +      return (enum gdb_signal) ((int) GDB_SIGNAL_REALTIME_65 + offset);
> > +    }
> > +
> > +  return GDB_SIGNAL_UNKNOWN;
> > +}
> > +
> > +/* Implement the "gdb_signal_to_target" gdbarch method.  */
> > +
> > +static int
> > +fbsd_gdb_signal_to_target (struct gdbarch *gdbarch,
> > +                enum gdb_signal signal)
> > +{
> > +  switch (signal)
> > +    {
> > +    case GDB_SIGNAL_0:
> > +      return 0;
> > +
> > +    case GDB_SIGNAL_HUP:
> > +      return FREEBSD_SIGHUP;
> > +
> > +    case GDB_SIGNAL_INT:
> > +      return FREEBSD_SIGINT;
> > +
> > +    case GDB_SIGNAL_QUIT:
> > +      return FREEBSD_SIGQUIT;
> > +
> > +    case GDB_SIGNAL_ILL:
> > +      return FREEBSD_SIGILL;
> > +
> > +    case GDB_SIGNAL_TRAP:
> > +      return FREEBSD_SIGTRAP;
> > +
> > +    case GDB_SIGNAL_ABRT:
> > +      return FREEBSD_SIGABRT;
> > +
> > +    case GDB_SIGNAL_EMT:
> > +      return FREEBSD_SIGEMT;
> > +
> > +    case GDB_SIGNAL_FPE:
> > +      return FREEBSD_SIGFPE;
> > +
> > +    case GDB_SIGNAL_KILL:
> > +      return FREEBSD_SIGKILL;
> > +
> > +    case GDB_SIGNAL_BUS:
> > +      return FREEBSD_SIGBUS;
> > +
> > +    case GDB_SIGNAL_SEGV:
> > +      return FREEBSD_SIGSEGV;
> > +
> > +    case GDB_SIGNAL_SYS:
> > +      return FREEBSD_SIGSYS;
> > +
> > +    case GDB_SIGNAL_PIPE:
> > +      return FREEBSD_SIGPIPE;
> > +
> > +    case GDB_SIGNAL_ALRM:
> > +      return FREEBSD_SIGALRM;
> > +
> > +    case GDB_SIGNAL_TERM:
> > +      return FREEBSD_SIGTERM;
> > +
> > +    case GDB_SIGNAL_URG:
> > +      return FREEBSD_SIGURG;
> > +
> > +    case GDB_SIGNAL_STOP:
> > +      return FREEBSD_SIGSTOP;
> > +
> > +    case GDB_SIGNAL_TSTP:
> > +      return FREEBSD_SIGTSTP;
> > +
> > +    case GDB_SIGNAL_CONT:
> > +      return FREEBSD_SIGCONT;
> > +
> > +    case GDB_SIGNAL_CHLD:
> > +      return FREEBSD_SIGCHLD;
> > +
> > +    case GDB_SIGNAL_TTIN:
> > +      return FREEBSD_SIGTTIN;
> > +
> > +    case GDB_SIGNAL_TTOU:
> > +      return FREEBSD_SIGTTOU;
> > +
> > +    case GDB_SIGNAL_IO:
> > +      return FREEBSD_SIGIO;
> > +
> > +    case GDB_SIGNAL_XCPU:
> > +      return FREEBSD_SIGXCPU;
> > +
> > +    case GDB_SIGNAL_XFSZ:
> > +      return FREEBSD_SIGXFSZ;
> > +
> > +    case GDB_SIGNAL_VTALRM:
> > +      return FREEBSD_SIGVTALRM;
> > +
> > +    case GDB_SIGNAL_PROF:
> > +      return FREEBSD_SIGPROF;
> > +
> > +    case GDB_SIGNAL_WINCH:
> > +      return FREEBSD_SIGWINCH;
> > +
> > +    case GDB_SIGNAL_INFO:
> > +      return FREEBSD_SIGINFO;
> > +
> > +    case GDB_SIGNAL_USR1:
> > +      return FREEBSD_SIGUSR1;
> > +
> > +    case GDB_SIGNAL_USR2:
> > +      return FREEBSD_SIGUSR2;
> > +
> > +    case GDB_SIGNAL_LWP:
> > +      return FREEBSD_SIGTHR;
> > +    }
> > +
> > +  if (signal >= GDB_SIGNAL_REALTIME_65
> > +      && signal <= GDB_SIGNAL_REALTIME_126)
> > +    {
> > +      int offset = signal - GDB_SIGNAL_REALTIME_65;
> > +
> > +      return FREEBSD_SIGRTMIN + offset;
> > +    }
> > +
> > +  return -1;
> > +}
> > +
> >  /* Implement the "get_syscall_number" gdbarch method.  */
> >
> >  static LONGEST
> > @@ -1171,6 +1451,8 @@ fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
> >    set_gdbarch_core_info_proc (gdbarch, fbsd_core_info_proc);
> >    set_gdbarch_print_auxv_entry (gdbarch, fbsd_print_auxv_entry);
> >    set_gdbarch_get_siginfo_type (gdbarch, fbsd_get_siginfo_type);
> > +  set_gdbarch_gdb_signal_from_target (gdbarch, fbsd_gdb_signal_from_target);
> > +  set_gdbarch_gdb_signal_to_target (gdbarch, fbsd_gdb_signal_to_target);
> >
> >    /* `catch syscall' */
> >    set_xml_syscall_file_name (gdbarch, "syscalls/freebsd.xml");
> > --
> > 2.15.1
> >
> >
> >
> > --
> > John Baldwin


-- 
John Baldwin