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MIPS: Clear XContext at boot time 

XContext might be dirty at boot time. We need to clear it
to ensure early stackframe is safe.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Jiaxun Yang 2020-04-22 22:45:34 +08:00 committed by Thomas Bogendoerfer
parent d82d500f51
commit c213db6146
1 changed files with 3 additions and 0 deletions
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3
arch/mips/kernel/head.S
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@ -132,6 +132,9 @@ dtb_found:
#endif #endif
MTC0 zero, CP0_CONTEXT # clear context register MTC0 zero, CP0_CONTEXT # clear context register
#ifdef CONFIG_64BIT
MTC0 zero, CP0_XCONTEXT
#endif
PTR_LA $28, init_thread_union PTR_LA $28, init_thread_union
/* Set the SP after an empty pt_regs. */ /* Set the SP after an empty pt_regs. */
PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE