Change in coreboot[master]: x86_64 assembly: Don't touch %gs

[Patrick Rudolph (Code Review)]

Attention is currently required from: Patrick Rudolph, Subrata Banik, Arthur Heymans, Angel Pons.
Hello build bot (Jenkins), Angel Pons, Subrata Banik, Arthur Heymans, Angel Pons,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/59764

to look at the new patch set (#2).

Change subject: x86_64 assembly: Don't touch %gs
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x86_64 assembly: Don't touch %gs

With CPU_INFO_V2 enabled %gs holds the pointer to the cpu_info struct,
so don't clobber it. Backup and restore %gs where possible.
Fixes a crash in MPinit seen after calling FSP-S.

Change-Id: If9fc999b34530de5d8b6ad27b9af25fc552e9420
Signed-off-by: Patrick Rudolph 
---
M src/cpu/x86/64bit/exit32.inc
M src/cpu/x86/64bit/mode_switch.S
M src/security/intel/txt/getsec_enteraccs.S
3 files changed, 16 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/64/59764/2