lkml.org 
[lkml]   [2020]   [Nov]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/3 v5] livepatch: Use the default ftrace_ops instead of REGS when ARGS is available
On Thu, Nov 12, 2020 at 09:21:44AM +0100, Peter Zijlstra wrote:
> Also, do you want something like:
>
> unsigned long ftrace_regs_get_register(struct ftrace_regs *regs, unsigned int offset)
> {

I forgot the full regs case:

if (regs->regs.cs)
return regs_get_register(regs->regs, offset);

> switch (offset / sizeof(long)) {
> case 4: /* RBP */
>
> case 8: /* R9 */
> case 9: /* R8 */
> case 10: /* RAX */
> case 11: /* RCX */
> case 12: /* RDX */
> case 13: /* RSI */
> case 14: /* RDI */
> case 15: /* ORIG_RAX */
> case 16: /* RIP */
> return *(unsigned long *)regs->regs + offset;
>
> default:
> WARN_ON_ONCE(1);
> }
> return 0;
> }

\
 
 \ /
  Last update: 2020-11-12 12:51    [W:0.488 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site