gdb/gdb-bz592031-siginfo-lost-5of5.patch

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http://sourceware.org/ml/gdb-patches/2010-09/msg00361.html
Subject: [patch 4/4]#3 Remove redundant lp->siginfo
Hi,
this is a simplification which should not affect GDB behavior. As linux-nat
now stops on each received signal without any reordering of them then
PTRACE_GETSIGINFO is enough to access siginfo, without any need to copy it in
advance.
Thanks,
Jan
gdb/
2010-09-20 Jan Kratochvil <jan.kratochvil@redhat.com>
* linux-nat.c (resume_callback) <lp->stopped && lp->status == 0>
(linux_nat_resume): Remove LP->SIGINFO clearing.
(save_siginfo): Remove.
(stop_wait_callback) <WSTOPSIG (status) != SIGSTOP>
(linux_nat_filter_event) <linux_nat_status_is_event (status)>: Remove
the save_siginfo call.
(resume_stopped_resumed_lwps): Remove LP->SIGINFO clearing.
(linux_nat_set_siginfo_fixup): Use PTRACE_GETSIGINFO.
* linux-nat.h (struct lwp_info) <siginfo>: Remove.
2012-01-03 15:00:12 +00:00
Index: gdb-7.4.50.20111218/gdb/linux-nat.c
===================================================================
2012-01-03 15:00:12 +00:00
--- gdb-7.4.50.20111218.orig/gdb/linux-nat.c 2011-12-19 02:17:05.000000000 +0100
+++ gdb-7.4.50.20111218/gdb/linux-nat.c 2011-12-19 02:17:43.188466854 +0100
@@ -1883,7 +1883,6 @@ resume_lwp (struct lwp_info *lp, int ste
step, TARGET_SIGNAL_0);
lp->stopped = 0;
lp->step = step;
- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
lp->stopped_by_watchpoint = 0;
}
else
@@ -2027,7 +2026,6 @@ linux_nat_resume (struct target_ops *ops
if (linux_nat_prepare_to_resume != NULL)
linux_nat_prepare_to_resume (lp);
linux_ops->to_resume (linux_ops, ptid, step, signo);
- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
lp->stopped_by_watchpoint = 0;
if (debug_linux_nat)
2012-01-03 15:00:12 +00:00
@@ -2612,22 +2610,6 @@ wait_lwp (struct lwp_info *lp)
return status;
}
-/* Save the most recent siginfo for LP. This is currently only called
- for SIGTRAP; some ports use the si_addr field for
- target_stopped_data_address. In the future, it may also be used to
- restore the siginfo of requeued signals. */
-
-static void
-save_siginfo (struct lwp_info *lp)
-{
- errno = 0;
- ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid),
- (PTRACE_TYPE_ARG3) 0, &lp->siginfo);
-
- if (errno != 0)
- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
-}
-
/* Send a SIGSTOP to LP. */
static int
2012-01-03 15:00:12 +00:00
@@ -2872,9 +2854,6 @@ stop_wait_callback (struct lwp_info *lp,
{
/* The thread was stopped with a signal other than SIGSTOP. */
- /* Save the trap's siginfo in case we need it later. */
- save_siginfo (lp);
-
save_sigtrap (lp);
if (debug_linux_nat)
2012-01-03 15:00:12 +00:00
@@ -3278,12 +3257,7 @@ linux_nat_filter_event (int lwpid, int s
}
if (linux_nat_status_is_event (status))
- {
- /* Save the trap's siginfo in case we need it later. */
- save_siginfo (lp);
-
- save_sigtrap (lp);
- }
+ save_sigtrap (lp);
/* Check if the thread has exited. */
if ((WIFEXITED (status) || WIFSIGNALED (status))
2012-01-03 15:00:12 +00:00
@@ -3961,7 +3935,6 @@ resume_stopped_resumed_lwps (struct lwp_
linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
lp->step, TARGET_SIGNAL_0);
lp->stopped = 0;
- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
lp->stopped_by_watchpoint = 0;
}
2012-01-03 15:00:12 +00:00
@@ -6029,11 +6002,19 @@ linux_nat_set_prepare_to_resume (struct
struct siginfo *
linux_nat_get_siginfo (ptid_t ptid)
{
- struct lwp_info *lp = find_lwp_pid (ptid);
+ static struct siginfo siginfo;
+ int pid;
- gdb_assert (lp != NULL);
+ pid = GET_LWP (ptid);
+ if (pid == 0)
+ pid = GET_PID (ptid);
+
+ errno = 0;
+ ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+ if (errno != 0)
+ memset (&siginfo, 0, sizeof (siginfo));
- return &lp->siginfo;
+ return &siginfo;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
2012-01-03 15:00:12 +00:00
Index: gdb-7.4.50.20111218/gdb/linux-nat.h
===================================================================
2012-01-03 15:00:12 +00:00
--- gdb-7.4.50.20111218.orig/gdb/linux-nat.h 2011-12-18 23:40:59.000000000 +0100
+++ gdb-7.4.50.20111218/gdb/linux-nat.h 2011-12-19 02:17:21.355548276 +0100
@@ -77,10 +77,6 @@ struct lwp_info
/* The kind of stepping of this LWP. */
enum resume_step step;
- /* Non-zero si_signo if this LWP stopped with a trap. si_addr may
- be the address of a hardware watchpoint. */
- struct siginfo siginfo;
-
/* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
watchpoint trap. */
int stopped_by_watchpoint;