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[1/9] ASoC: SOF: Xtensa: dump ar registers to restore call stack

Message ID 20230919092416.4137-2-peter.ujfalusi@linux.intel.com (mailing list archive)
State Accepted
Commit 58bb5081cba130f12c26d8e4d5e9416a0272f07e
Headers show
Series ASoC: SOF: ipc4/Intel: Support for firmware exception handling | expand

Commit Message

Peter Ujfalusi Sept. 19, 2023, 9:24 a.m. UTC 
From: Rander Wang <rander.wang@intel.com>

On Xtensa platform ar0 is for caller address and ar1 is for stack
address. The ar register dump can be used to rebuild call stack with
FW elf file by debug tools.

Signed-off-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 sound/soc/sof/xtensa/core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/sound/soc/sof/xtensa/core.c b/sound/soc/sof/xtensa/core.c
index bebbe3a2865c..7c91a919eadc 100644
--- a/sound/soc/sof/xtensa/core.c
+++ b/sound/soc/sof/xtensa/core.c
@@ -132,6 +132,17 @@  static void xtensa_stack(struct snd_sof_dev *sdev, const char *level, void *oops
 				   buf, sizeof(buf), false);
 		dev_printk(level, sdev->dev, "0x%08x: %s\n", stack_ptr + i * 4, buf);
 	}
+
+	if (!xoops->plat_hdr.numaregs)
+		return;
+
+	dev_printk(level, sdev->dev, "AR registers:\n");
+	/* the number of ar registers is a multiple of 4 */
+	for (i = 0; i < xoops->plat_hdr.numaregs; i += 4) {
+		hex_dump_to_buffer(xoops->ar + i, 16, 16, 4,
+				   buf, sizeof(buf), false);
+		dev_printk(level, sdev->dev, "%#x: %s\n", i * 4, buf);
+	}
 }
 
 const struct dsp_arch_ops sof_xtensa_arch_ops = {