linux-kernel - [PATCH linux-next] ARM: unwind: use ex_frame with CONFIG_UNWINDER_FRAME

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Message-ID: <202305181658063480018@zte.com.cn>
Date:   Thu, 18 May 2023 16:58:06 +0800 (CST)
From:   <guo.ziliang@....com.cn>
To:     <linux@...linux.org.uk>, <rmk+kernel@...linux.org.uk>
Cc:     <linus.walleij@...aro.org>, <lihuafei1@...wei.com>,
        <broonie@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject:  [PATCH linux-next] ARM: unwind: use ex_frame with CONFIG_UNWINDER_FRAME_POINTER

From: guo ziliang <guo.ziliang@....com.cn>

We define ex_frame with CONFIG_UNWINDER_FRAME_POINTER in struct stackframe,
struct stackframe
{
	......
#ifdef CONFIG_UNWINDER_FRAME_POINTER
    bool ex_frame;
#endif
};
but we just use ex_frame without CONFIG_UNWINDER_FRAME_POINTER in
return_address() and unwind_frame(). 
Maybe we should fix it.

Signed-off-by: guo ziliang <guo.ziliang@....com.cn>
---
 arch/arm/kernel/return_address.c | 2 ++
 arch/arm/kernel/stacktrace.c     | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/arch/arm/kernel/return_address.c b/arch/arm/kernel/return_address.c
index ac15db6..dae49e7 100644
--- a/arch/arm/kernel/return_address.c
+++ b/arch/arm/kernel/return_address.c
@@ -47,7 +47,9 @@ void *return_address(unsigned int level)
 	frame.kr_cur = NULL;
 	frame.tsk = current;
 #endif
+#ifdef CONFIG_UNWINDER_FRAME_POINTER
 	frame.ex_frame = false;
+#endif

 	walk_stackframe(&frame, save_return_addr, &data);

diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
index 620aa82..338f552 100644
--- a/arch/arm/kernel/stacktrace.c
+++ b/arch/arm/kernel/stacktrace.c
@@ -82,6 +82,7 @@ int notrace unwind_frame(struct stackframe *frame)
 	if (frame_pointer_check(frame))
 		return -EINVAL;

+#ifdef CONFIG_UNWINDER_FRAME_POINTER
 	/*
 	 * When we unwind through an exception stack, include the saved PC
 	 * value into the stack trace.
@@ -102,6 +103,7 @@ int notrace unwind_frame(struct stackframe *frame)
 		frame->ex_frame = false;
 		return 0;
 	}
+#endif

 	/* restore the registers from the stack frame */
 #ifdef CONFIG_CC_IS_CLANG
@@ -119,8 +121,10 @@ int notrace unwind_frame(struct stackframe *frame)
 					(void *)frame->fp, &frame->kr_cur);
 #endif

+#ifdef CONFIG_UNWINDER_FRAME_POINTER
 	if (in_entry_text(frame->pc))
 		frame->ex_frame = true;
+#endif

 	return 0;
 }
-- 
1.8.3.1