Messages in this thread Patch in this message | | | From | James Morse <> | Subject | [stable:PATCH v4.9.309 30/43] arm64: entry: Don't assume tramp_vectors is the start of the vectors | Date | Wed, 6 Apr 2022 17:45:33 +0100 |
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commit ed50da7764535f1e24432ded289974f2bf2b0c5a upstream.
The tramp_ventry macro uses tramp_vectors as the address of the vectors when calculating which ventry in the 'full fat' vectors to branch to.
While there is one set of tramp_vectors, this will be true. Adding multiple sets of vectors will break this assumption.
Move the generation of the vectors to a macro, and pass the start of the vectors as an argument to tramp_ventry.
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: James Morse <james.morse@arm.com> --- arch/arm64/kernel/entry.S | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 4c4f7df5f0f3..114922c1c3e3 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -926,7 +926,7 @@ __ni_sys_trace: sub \dst, \dst, PAGE_SIZE .endm - .macro tramp_ventry, regsize = 64 + .macro tramp_ventry, vector_start, regsize .align 7 1: .if \regsize == 64 @@ -948,9 +948,9 @@ __ni_sys_trace: #else ldr x30, =vectors #endif - prfm plil1strm, [x30, #(1b - tramp_vectors)] + prfm plil1strm, [x30, #(1b - \vector_start)] msr vbar_el1, x30 - add x30, x30, #(1b - tramp_vectors + 4) + add x30, x30, #(1b - \vector_start + 4) isb ret .org 1b + 128 // Did we overflow the ventry slot? @@ -968,19 +968,21 @@ __ni_sys_trace: eret .endm - .align 11 -ENTRY(tramp_vectors) + .macro generate_tramp_vector +.Lvector_start\@: .space 0x400 - tramp_ventry - tramp_ventry - tramp_ventry - tramp_ventry + .rept 4 + tramp_ventry .Lvector_start\@, 64 + .endr + .rept 4 + tramp_ventry .Lvector_start\@, 32 + .endr + .endm - tramp_ventry 32 - tramp_ventry 32 - tramp_ventry 32 - tramp_ventry 32 + .align 11 +ENTRY(tramp_vectors) + generate_tramp_vector END(tramp_vectors) ENTRY(tramp_exit_native) -- 2.30.2
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