The patch titled
core dump: user_regset writeback
has been added to the -mm tree. Its filename is
core-dump-user_regset-writeback.patch
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------------------------------------------------------
Subject: core dump: user_regset writeback
From: Roland McGrath <roland@xxxxxxxxxx>
This makes the user_regset-based core dump code call user_regset writeback
hooks when available. This is necessary groundwork to allow IA64 to set
CORE_DUMP_USE_REGSET.
Cc: Shaohua Li <shaohua.li@xxxxxxxxx>
Signed-off-by: Roland McGrath <roland@xxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff -puN fs/binfmt_elf.c~core-dump-user_regset-writeback fs/binfmt_elf.c
--- a/fs/binfmt_elf.c~core-dump-user_regset-writeback
+++ a/fs/binfmt_elf.c
@@ -1421,6 +1421,18 @@ struct elf_note_info {
int thread_notes;
};
+/*
+ * When a regset has a writeback hook, we call it on each thread before
+ * dumping user memory. On register window machines, this makes sure the
+ * user memory backing the register data is up to date before we read it.
+ */
+static void do_thread_regset_writeback(struct task_struct *task,
+ const struct user_regset *regset)
+{
+ if (regset->writeback)
+ regset->writeback(task, regset, 1);
+}
+
static int fill_thread_core_info(struct elf_thread_core_info *t,
const struct user_regset_view *view,
long signr, size_t *total)
@@ -1442,6 +1454,8 @@ static int fill_thread_core_info(struct
sizeof(t->prstatus), &t->prstatus);
*total += notesize(&t->notes[0]);
+ do_thread_regset_writeback(t->task, &view->regsets[0]);
+
/*
* Each other regset might generate a note too. For each regset
* that has no core_note_type or is inactive, we leave t->notes[i]
@@ -1449,6 +1463,7 @@ static int fill_thread_core_info(struct
*/
for (i = 1; i < view->n; ++i) {
const struct user_regset *regset = &view->regsets[i];
+ do_thread_regset_writeback(t->task, regset);
if (regset->core_note_type &&
(!regset->active || regset->active(t->task, regset))) {
int ret;
_
Patches currently in -mm which might be from roland@xxxxxxxxxx are
elfcore-compat-fix-uid-gid-types.patch
git-x86.patch
handle_stop_signal-dont-wake-up-the-stopped-task-until-it-sees-sigcont.patch
add-rusage_thread.patch
remove-unused-variable-from-send_signal.patch
turn-legacy_queue-macro-into-static-inline-function.patch
consolidate-checking-for-ignored-legacy-signals.patch
consolidate-checking-for-ignored-legacy-signals-simplify.patch
signals-do_signal_stop-use-signal_group_exit.patch
signals-do_group_exit-use-signal_group_exit-more-consistently.patch
lock_task_sighand-add-rcu-lock-unlock.patch
k_getrusage-dont-take-rcu_read_lock.patch
do_task_stat-dont-take-rcu_read_lock.patch
signals-consolidate-checks-for-whether-or-not-to-ignore-a-signal.patch
signals-clean-dequeue_signal-from-excess-checks-and-assignments.patch
signals-consolidate-send_sigqueue-and-send_group_sigqueue.patch
signals-cleanup-security_task_kill-usage-implementation.patch
core-dump-user_regset-writeback.patch
free_pidmap-turn-it-into-free_pidmapstruct-upid.patch
put_pid-make-sure-we-dont-free-the-live-pid.patch
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