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Date:   Wed, 12 Aug 2020 12:06:01 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, ldv@...linux.org,
        viro@...iv.linux.org.uk
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v1 10/19] powerpc/signal: Refactor bad frame logging

The logging of bad frame appears half a dozen of times
and is pretty similar.

Create signal_fault() fonction to perform that logging.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/kernel/signal.c    | 11 +++++++++++
 arch/powerpc/kernel/signal.h    |  3 +++
 arch/powerpc/kernel/signal_32.c | 35 +++++----------------------------
 arch/powerpc/kernel/signal_64.c | 15 ++------------
 4 files changed, 21 insertions(+), 43 deletions(-)

diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 5edded5c5d20..53b4987a45b5 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -355,3 +355,14 @@ static unsigned long get_tm_stackpointer(struct task_struct *tsk)
 #endif
 	return ret;
 }
+
+static const char fmt32[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %08lx lr %08lx\n";
+static const char fmt64[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %016lx lr %016lx\n";
+
+void signal_fault(struct task_struct *tsk, struct pt_regs *regs,
+		  const char *where, void __user *ptr)
+{
+	if (show_unhandled_signals)
+		printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32, tsk->comm,
+				    task_pid_nr(tsk), where, ptr, regs->nip, regs->link);
+}
diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index fb98731348c3..f610cfafa478 100644
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h
@@ -93,4 +93,7 @@ static inline int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
 
 #endif /* !defined(CONFIG_PPC64) */
 
+void signal_fault(struct task_struct *tsk, struct pt_regs *regs,
+		  const char *where, void __user *ptr);
+
 #endif  /* _POWERPC_ARCH_SIGNAL_H */
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 3356f6aba4ae..d1087dd87174 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -837,12 +837,7 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
 	return 0;
 
 badframe:
-	if (show_unhandled_signals)
-		printk_ratelimited(KERN_INFO
-				   "%s[%d]: bad frame in handle_rt_signal32: "
-				   "%p nip %08lx lr %08lx\n",
-				   tsk->comm, tsk->pid,
-				   addr, regs->nip, regs->link);
+	signal_fault(tsk, regs, "handle_rt_signal32", addr);
 
 	return 1;
 }
@@ -1094,12 +1089,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
 	return 0;
 
  bad:
-	if (show_unhandled_signals)
-		printk_ratelimited(KERN_INFO
-				   "%s[%d]: bad frame in sys_rt_sigreturn: "
-				   "%p nip %08lx lr %08lx\n",
-				   current->comm, current->pid,
-				   rt_sf, regs->nip, regs->link);
+	signal_fault(current, regs, "sys_rt_sigreturn", rt_sf);
 
 	force_sig(SIGSEGV);
 	return 0;
@@ -1183,12 +1173,7 @@ SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
 	 * We kill the task with a SIGSEGV in this situation.
 	 */
 	if (do_setcontext(ctx, regs, 1)) {
-		if (show_unhandled_signals)
-			printk_ratelimited(KERN_INFO "%s[%d]: bad frame in "
-					   "sys_debug_setcontext: %p nip %08lx "
-					   "lr %08lx\n",
-					   current->comm, current->pid,
-					   ctx, regs->nip, regs->link);
+		signal_fault(current, regs, "sys_debug_setcontext", ctx);
 
 		force_sig(SIGSEGV);
 		goto out;
@@ -1291,12 +1276,7 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
 	return 0;
 
 badframe:
-	if (show_unhandled_signals)
-		printk_ratelimited(KERN_INFO
-				   "%s[%d]: bad frame in handle_signal32: "
-				   "%p nip %08lx lr %08lx\n",
-				   tsk->comm, tsk->pid,
-				   frame, regs->nip, regs->link);
+	signal_fault(tsk, regs, "handle_signal32", frame);
 
 	return 1;
 }
@@ -1367,12 +1347,7 @@ SYSCALL_DEFINE0(sigreturn)
 	return 0;
 
 badframe:
-	if (show_unhandled_signals)
-		printk_ratelimited(KERN_INFO
-				   "%s[%d]: bad frame in sys_sigreturn: "
-				   "%p nip %08lx lr %08lx\n",
-				   current->comm, current->pid,
-				   addr, regs->nip, regs->link);
+	signal_fault(current, regs, "sys_sigreturn", addr);
 
 	force_sig(SIGSEGV);
 	return 0;
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 92d152c1155c..a10b0bb14131 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -66,11 +66,6 @@ struct rt_sigframe {
 	char abigap[USER_REDZONE_SIZE];
 } __attribute__ ((aligned (16)));
 
-static const char fmt32[] = KERN_INFO \
-	"%s[%d]: bad frame in %s: %08lx nip %08lx lr %08lx\n";
-static const char fmt64[] = KERN_INFO \
-	"%s[%d]: bad frame in %s: %016lx nip %016lx lr %016lx\n";
-
 /*
  * This computes a quad word aligned pointer inside the vmx_reserve array
  * element. For historical reasons sigcontext might not be quad word aligned,
@@ -801,10 +796,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
 	return 0;
 
 badframe:
-	if (show_unhandled_signals)
-		printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
-				   current->comm, current->pid, "rt_sigreturn",
-				   (long)uc, regs->nip, regs->link);
+	signal_fault(current, regs, "rt_sigreturn", uc);
 
 	force_sig(SIGSEGV);
 	return 0;
@@ -913,10 +905,7 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
 	return 0;
 
 badframe:
-	if (show_unhandled_signals)
-		printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
-				   tsk->comm, tsk->pid, "setup_rt_frame",
-				   (long)frame, regs->nip, regs->link);
+	signal_fault(current, regs, "handle_rt_signal64", frame);
 
 	return 1;
 }
-- 
2.25.0

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