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powerpc/8xx: Move tail of alignment exception out of line

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When we enable VMAP_STACK there will not be enough room for the
alignment handler at 0x600 in head_8xx.S. For now move the tail of the
alignment handler out of line, and branch to it.

Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2020-01-26 00:20:16 +11:00
parent afe1ec5ab8
commit d52668f6b3
1 changed files with 6 additions and 1 deletions
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7
arch/powerpc/kernel/head_8xx.S
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@ -145,7 +145,7 @@ Alignment:
li r6, RPN_PATTERN li r6, RPN_PATTERN
mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */ mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */
addi r3,r1,STACK_FRAME_OVERHEAD addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception) b .Lalignment_exception_ool
/* Program check exception */ /* Program check exception */
EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD) EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
@ -153,6 +153,11 @@ Alignment:
/* Decrementer */ /* Decrementer */
EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE) EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
/* With VMAP_STACK there's not enough room for this at 0x600 */
. = 0xa00
.Lalignment_exception_ool:
EXC_XFER_STD(0x600, alignment_exception)
/* System call */ /* System call */
. = 0xc00 . = 0xc00
SystemCall: SystemCall: