From c8f573eccb7398d7c198e547c630351e69af5ca1 Mon Sep 17 00:00:00 2001
From: Sven Schnelle <svens@linux.ibm.com>
Date: Fri, 1 Oct 2021 13:42:08 +0200
Subject: [PATCH] s390/ptrace: add last_break member to pt_regs
Instead of using args[0] for the value of the last breaking event
address register, add a member to make things more obvious.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---
arch/s390/include/asm/ptrace.h | 1 +
arch/s390/kernel/dumpstack.c | 2 +-
arch/s390/kernel/traps.c | 2 +-
3 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h
index 82fc11907451b..4ffa8e7f0ed3a 100644
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -96,6 +96,7 @@ struct pt_regs {
};
unsigned long flags;
unsigned long cr1;
+ unsigned long last_break;
};
/*
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index db1bc00229caf..85f326e258df8 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -152,7 +152,7 @@ void show_stack(struct task_struct *task, unsigned long *stack,
static void show_last_breaking_event(struct pt_regs *regs)
{
printk("Last Breaking-Event-Address:\n");
- printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
+ printk(" [<%016lx>] %pSR\n", regs->last_break, (void *)regs->last_break);
}
void show_registers(struct pt_regs *regs)
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index bcefc2173de45..d984f0b426040 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -314,7 +314,7 @@ void noinstr __do_pgm_check(struct pt_regs *regs)
if (last_break < 4096)
last_break = 1;
current->thread.last_break = last_break;
- regs->args[0] = last_break;
+ regs->last_break = last_break;
}
if (S390_lowcore.pgm_code & 0x0200) {
--
2.30.2