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Commit d31472b6 authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds
Browse files

core dump: user_regset writeback 



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@intel.com>
Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 938a9204

fs/binfmt_elf.c

+15 −0
Original line number Diff line number Diff line
@@ -1424,6 +1424,18 @@ 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)
@@ -1445,6 +1457,8 @@ static int fill_thread_core_info(struct elf_thread_core_info *t, 
		  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]
@@ -1452,6 +1466,7 @@ static int fill_thread_core_info(struct elf_thread_core_info *t, 
	 */

	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;