dump: update task registers if a signal is started handling

When we try to execute a parasite code, a signal can be started
handling, so we need to update a task registers, which will be saved in
a core file.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/arm/crtools.c

@@ -77,7 +77,8 @@ int syscall_seized(struct parasite_ctl *ctl, int nr, unsigned long *ret,
 	regs.ARM_r5 = arg6;
 
 	parasite_setup_regs(ctl->syscall_ip, 0, &regs);
-	err = __parasite_execute(ctl, ctl->pid.real, &regs);
+	err = __parasite_execute(ctl, ctl->pid.real, &regs,
+					&ctl->threads[0].regs_orig);
 	if (err)
 		return err;
 

arch/x86/crtools.c

@@ -101,7 +101,8 @@ int syscall_seized(struct parasite_ctl *ctl, int nr, unsigned long *ret,
 	regs.r9  = arg6;
 
 	parasite_setup_regs(ctl->syscall_ip, 0, &regs);
-	err = __parasite_execute(ctl, ctl->pid.real, &regs);
+	err = __parasite_execute(ctl, ctl->pid.real, &regs,
+					&ctl->threads[0].regs_orig);
 	if (err)
 		return err;
 

include/parasite-syscall.h

@@ -93,7 +93,9 @@ int syscall_seized(struct parasite_ctl *ctl, int nr, unsigned long *ret,
 		unsigned long arg5,
 		unsigned long arg6);
 
-extern int __parasite_execute(struct parasite_ctl *ctl, pid_t pid, user_regs_struct_t *regs);
+extern int __parasite_execute(struct parasite_ctl *ctl, pid_t pid,
+					user_regs_struct_t *regs,
+					user_regs_struct_t *regs_orig);
 extern bool arch_can_dump_task(pid_t pid);
 
 extern int parasite_fixup_vdso(struct parasite_ctl *ctl, pid_t pid,

parasite-syscall.c

@@ -63,7 +63,9 @@ static struct vma_area *get_vma_by_ip(struct list_head *vma_area_list, unsigned
 }
 
 /* we run at @regs->ip */
-int __parasite_execute(struct parasite_ctl *ctl, pid_t pid, user_regs_struct_t *regs)
+int __parasite_execute(struct parasite_ctl *ctl, pid_t pid,
+				user_regs_struct_t *regs,
+				user_regs_struct_t *regs_orig)
 {
 	siginfo_t siginfo;
 	int status;
@@ -171,7 +173,7 @@ retry_signal:
 				pr_perror("Can't obtain registers (pid: %d)", pid);
 				goto err;
 			}
-			ctl->threads[0].regs_orig = r;
+			*regs_orig = r;
 		}
 
 		goto again;
@@ -208,7 +210,7 @@ static int parasite_execute_by_id(unsigned int cmd, struct parasite_ctl *ctl, in
 
 	parasite_setup_regs(ctl->parasite_ip, thread->rstack, &regs);
 
-	ret = __parasite_execute(ctl, pid, &regs);
+	ret = __parasite_execute(ctl, pid, &regs, &thread->regs_orig);
 	if (ret == 0)
 		ret = (int)REG_RES(regs);