142 lines
4.4 KiB
Diff
142 lines
4.4 KiB
Diff
http://sourceware.org/ml/gdb-patches/2010-09/msg00361.html
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Subject: [patch 4/4]#3 Remove redundant lp->siginfo
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Hi,
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this is a simplification which should not affect GDB behavior. As linux-nat
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now stops on each received signal without any reordering of them then
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PTRACE_GETSIGINFO is enough to access siginfo, without any need to copy it in
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advance.
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Thanks,
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Jan
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gdb/
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2010-09-20 Jan Kratochvil <jan.kratochvil@redhat.com>
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* linux-nat.c (resume_callback) <lp->stopped && lp->status == 0>
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(linux_nat_resume): Remove LP->SIGINFO clearing.
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(save_siginfo): Remove.
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(stop_wait_callback) <WSTOPSIG (status) != SIGSTOP>
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(linux_nat_filter_event) <linux_nat_status_is_event (status)>: Remove
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the save_siginfo call.
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(resume_stopped_resumed_lwps): Remove LP->SIGINFO clearing.
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(linux_nat_set_siginfo_fixup): Use PTRACE_GETSIGINFO.
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* linux-nat.h (struct lwp_info) <siginfo>: Remove.
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Index: gdb-7.4.50.20120602/gdb/linux-nat.c
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===================================================================
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--- gdb-7.4.50.20120602.orig/gdb/linux-nat.c 2012-06-02 21:36:21.067483466 +0200
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+++ gdb-7.4.50.20120602/gdb/linux-nat.c 2012-06-02 21:37:55.345447402 +0200
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@@ -1929,7 +1929,6 @@ resume_lwp (struct lwp_info *lp, int ste
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step, GDB_SIGNAL_0);
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lp->stopped = 0;
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lp->step = step;
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- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
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lp->stopped_by_watchpoint = 0;
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}
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else
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@@ -2071,7 +2070,6 @@ linux_nat_resume (struct target_ops *ops
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if (linux_nat_prepare_to_resume != NULL)
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linux_nat_prepare_to_resume (lp);
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linux_ops->to_resume (linux_ops, ptid, step, signo);
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- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
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lp->stopped_by_watchpoint = 0;
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if (debug_linux_nat)
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@@ -2625,22 +2623,6 @@ wait_lwp (struct lwp_info *lp)
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return status;
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}
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-/* Save the most recent siginfo for LP. This is currently only called
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- for SIGTRAP; some ports use the si_addr field for
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- target_stopped_data_address. In the future, it may also be used to
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- restore the siginfo of requeued signals. */
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-
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-static void
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-save_siginfo (struct lwp_info *lp)
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-{
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- errno = 0;
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- ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid),
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- (PTRACE_TYPE_ARG3) 0, &lp->siginfo);
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-
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- if (errno != 0)
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- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
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-}
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-
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/* Send a SIGSTOP to LP. */
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static int
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@@ -2885,9 +2867,6 @@ stop_wait_callback (struct lwp_info *lp,
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{
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/* The thread was stopped with a signal other than SIGSTOP. */
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- /* Save the trap's siginfo in case we need it later. */
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- save_siginfo (lp);
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-
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save_sigtrap (lp);
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if (debug_linux_nat)
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@@ -3291,12 +3270,7 @@ linux_nat_filter_event (int lwpid, int s
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}
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if (linux_nat_status_is_event (status))
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- {
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- /* Save the trap's siginfo in case we need it later. */
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- save_siginfo (lp);
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-
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- save_sigtrap (lp);
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- }
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+ save_sigtrap (lp);
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/* Check if the thread has exited. */
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if ((WIFEXITED (status) || WIFSIGNALED (status))
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@@ -3950,7 +3924,6 @@ resume_stopped_resumed_lwps (struct lwp_
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linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
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lp->step, GDB_SIGNAL_0);
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lp->stopped = 0;
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- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
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lp->stopped_by_watchpoint = 0;
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}
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@@ -5227,11 +5200,19 @@ linux_nat_set_prepare_to_resume (struct
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siginfo_t *
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linux_nat_get_siginfo (ptid_t ptid)
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{
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- struct lwp_info *lp = find_lwp_pid (ptid);
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+ static siginfo_t siginfo;
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+ int pid;
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- gdb_assert (lp != NULL);
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+ pid = GET_LWP (ptid);
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+ if (pid == 0)
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+ pid = GET_PID (ptid);
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+
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+ errno = 0;
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+ ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
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+ if (errno != 0)
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+ memset (&siginfo, 0, sizeof (siginfo));
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- return &lp->siginfo;
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+ return &siginfo;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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Index: gdb-7.4.50.20120602/gdb/linux-nat.h
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===================================================================
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--- gdb-7.4.50.20120602.orig/gdb/linux-nat.h 2012-06-02 21:36:21.067483466 +0200
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+++ gdb-7.4.50.20120602/gdb/linux-nat.h 2012-06-02 21:36:27.140481144 +0200
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@@ -76,10 +76,6 @@ struct lwp_info
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/* The kind of stepping of this LWP. */
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enum resume_step step;
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- /* Non-zero si_signo if this LWP stopped with a trap. si_addr may
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- be the address of a hardware watchpoint. */
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- siginfo_t siginfo;
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-
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/* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
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watchpoint trap. */
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int stopped_by_watchpoint;
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