* what the difference between esp and esp0?
@ 2015-06-16 11:27 hitmoon
2015-06-16 20:46 ` David Matlack
0 siblings, 1 reply; 5+ messages in thread
From: hitmoon @ 2015-06-16 11:27 UTC (permalink / raw)
To: kernelnewbies
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* what the difference between esp and esp0?
2015-06-16 11:27 what the difference between esp and esp0? hitmoon
@ 2015-06-16 20:46 ` David Matlack
2015-06-17 3:11 ` 回复：Re: " hitmoon
0 siblings, 1 reply; 5+ messages in thread
From: David Matlack @ 2015-06-16 20:46 UTC (permalink / raw)
To: kernelnewbies
On Tue, Jun 16, 2015 at 4:27 AM, hitmoon <zhaoxiaoqiang007@gmail.com> wrote:
> Hi:
> I recently read the book "understanding the linux kernel 3rd", in the
> task switch process, there are two esp in thread_struct. In macro
> 'switch_to' , The esp is loaded to switch to the next's kernel stack, but
> in '__switch_to', esp0 is copied to tss's esp0 field, what the esp0 mean?
> What the difference between them?
esp0 is the stack pointer that is loaded into esp when the privileged level
changes to 0. For example, when a process running in user mode (level 3)
jumps into the kernel via a system call.
You can read more about it in the Intel SDM, Volume 3 Chapter 7.
http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html
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* 回复：Re: what the difference between esp and esp0?
2015-06-16 20:46 ` David Matlack
@ 2015-06-17 3:11 ` hitmoon
[not found] ` <5580E9E3.4080807@gmail.com>
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From: hitmoon @ 2015-06-17 3:11 UTC (permalink / raw)
To: kernelnewbies
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* 回复：Re: 回复：Re: what the difference between esp and esp0?
[not found] ` <5580E9E3.4080807@gmail.com>
@ 2015-06-17 4:32 ` hitmoon
2015-06-17 11:14 ` hitmoon
1 sibling, 0 replies; 5+ messages in thread
From: hitmoon @ 2015-06-17 4:32 UTC (permalink / raw)
To: kernelnewbies
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[not found] ` <5580E9E3.4080807@gmail.com>
2015-06-17 4:32 ` 回复：Re: " hitmoon
@ 2015-06-17 11:14 ` hitmoon
1 sibling, 0 replies; 5+ messages in thread
From: hitmoon @ 2015-06-17 11:14 UTC (permalink / raw)
To: kernelnewbies
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2015-06-16 11:27 what the difference between esp and esp0? hitmoon
2015-06-16 20:46 ` David Matlack
2015-06-17 3:11 ` 回复：Re: " hitmoon
[not found] ` <5580E9E3.4080807@gmail.com>
2015-06-17 4:32 ` 回复：Re: " hitmoon
2015-06-17 11:14 ` hitmoon
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