[Sound-open-firmware] [alsa-devel] [PATCH v3 13/14] ASoC: SOF: Add xtensa support

[rander.wang]

在 12/12/2018 8:00 AM, Pierre-Louis Bossart 写道:
>
> On 12/11/18 5:08 PM, Andy Shevchenko wrote:
>> On Tue, Dec 11, 2018 at 03:23:17PM -0600, Pierre-Louis Bossart wrote:
>>> Add common directory for xtensa architecture
>>> +    for (i = 0; i <= stack_words - 4; i += 4) {
>>> +        dev_err(sdev->dev, "0x%8.8x: 0x%8.8x 0x%8.8x 0x%8.8x 
>>> 0x%8.8x\n",
>>> +            stack_ptr + i, stack[i], stack[i + 1], stack[i + 2],
>>> +            stack[i + 3]);
>>> +    }
>>> +
>>> +    /* deal with any remaining words */
>>> +    switch (stack_words - i) {
>>> +    case 0:
>>> +        break;
>>> +    case 1:
>>> +        dev_err(sdev->dev, "0x%8.8x: 0x%8.8x\n",
>>> +            stack_ptr + stack_words - 1, stack[stack_words - 1]);
>>> +        break;
>>> +    case 2:
>>> +        dev_err(sdev->dev, "0x%8.8x: 0x%8.8x 0x%8.8x\n",
>>> +            stack_ptr + stack_words - 2, stack[stack_words - 2],
>>> +            stack[stack_words - 1]);
>>> +        break;
>>> +    case 3:
>>> +        dev_err(sdev->dev, "0x%8.8x: 0x%8.8x 0x%8.8x 0x%8.8x\n",
>>> +            stack_ptr + stack_words - 3, stack[stack_words - 3],
>>> +            stack[stack_words - 2], stack[stack_words - 1]);
>>> +        break;
>>> +    default:
>>> +        break;
>>> +    }
>> hex_dump_to_buffer().
> I vaguely recall there was a reason not to do it, we'll relook at this.
>
we don't want to convert a blob of data to "hex ASCII" in memory 
(hex_dump_to_buffer).

Here, we just want to dump the content of call stack, like:

[    3.250628] sof-audio sof-audio: 0x0049fbb0: 0x8000f2d0 0x0049fc00 
0x6f6c6c61 0x00632e63
[    3.250670] sof-audio sof-audio: 0x0049fbb4: 0x00ffffff 0x0010b5d4 
0x00000000 0x2000004c
[    3.250710] sof-audio sof-audio: 0x0049fbb8: 0x0040d000 0x00000000 
0x0000024c 0x2000930c
[    3.250747] sof-audio sof-audio: 0x0049fbbc: 0x8000454c 0x0049fc30 
0x00401e20 0x00000001
[    3.250787] sof-audio sof-audio: 0x0049fbc0: 0x8000454c 0x0049fc30 
0x00401e20 0x00000001
[    3.250827] sof-audio sof-audio: 0x0049fbc4: 0x00000000 0x00000001 
0x00000010 0x0049fcb8
[    3.250865] sof-audio sof-audio: 0x0049fbc8: 0x0040a000 0x00401e98 
0x00000001 0x00000002
[    3.250889] sof-audio sof-audio: 0x0049fbcc: 0x80005ac5 0x0049fc60 
0x00000000 0x00000000

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