powerpc/ptrace: Hard wire PT_SOFTE value to 1 in gpr_get() too

The commit a8a4b03a ("powerpc: Hard wire PT_SOFTE value to 1 in
ptrace & signals") changed ptrace_get_reg(PT_SOFTE) to report 0x1,
but PTRACE_GETREGS still copies pt_regs->softe as is.

This is not consistent and this breaks the user-regs-peekpoke test
from https://sourceware.org/systemtap/wiki/utrace/tests/Reported-by: Jan Kratochvil <jan.kratochvil@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201119160247.GB5188@redhat.com

arch/powerpc/kernel/ptrace/ptrace-tm.c

@@ -87,6 +87,9 @@ int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset,
 		struct membuf to)
 {
 	struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
+#ifdef CONFIG_PPC64
+	struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
+#endif
 
 	if (!cpu_has_feature(CPU_FTR_TM))
 		return -ENODEV;
@@ -101,7 +104,9 @@ int tm_cgpr_get(struct task_struct *target, const struct user_regset *regset,
 	membuf_write(&to, &target->thread.ckpt_regs, sizeof(struct user_pt_regs));
 
 	membuf_store(&to_msr, get_user_ckpt_msr(target));
-
+#ifdef CONFIG_PPC64
+	membuf_store(&to_softe, 0x1ul);
+#endif
 	return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
 			sizeof(struct user_pt_regs));
 }

arch/powerpc/kernel/ptrace/ptrace-view.c

@@ -218,6 +218,9 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset,
 		   struct membuf to)
 {
 	struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
+#ifdef CONFIG_PPC64
+	struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
+#endif
 	int i;
 
 	if (target->thread.regs == NULL)
@@ -232,7 +235,9 @@ static int gpr_get(struct task_struct *target, const struct user_regset *regset,
 	membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs));
 
 	membuf_store(&to_msr, get_user_msr(target));
-
+#ifdef CONFIG_PPC64
+	membuf_store(&to_softe, 0x1ul);
+#endif
 	return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
 				 sizeof(struct user_pt_regs));
 }