[lkml]   [2020]   [Feb]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 07/62] x86/boot/compressed/64: Disable red-zone usage
On Tue, Feb 11, 2020 at 5:53 AM Joerg Roedel <> wrote:
> From: Joerg Roedel <>
> The x86-64 ABI defines a red-zone on the stack:
> The 128-byte area beyond the location pointed to by %rsp is
> considered to be reserved and shall not be modified by signal or
> interrupt handlers. 10 Therefore, functions may use this area for
> temporary data that is not needed across function calls. In
> particular, leaf functions may use this area for their entire stack
> frame, rather than adjusting the stack pointer in the prologue and
> epilogue. This area is known as the red zone.
> This is not compatible with exception handling, so disable it for the
> pre-decompression boot code.

Acked-by: Andy Lutomirski <>

I admit that I thought we already supported exceptions this early. At
least I seem to remember writing this code. Maybe it never got


 \ /
  Last update: 2020-02-11 23:14    [W:0.222 / U:0.404 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site