[stable:PATCH v5.4.184 10/22] arm64: entry: Don't assume tramp_vectors is the start of the vectors
From: James Morse <james.morse@arm.com>
Date: 2022-03-15 18:24:45
Also in:
stable
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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) <redacted> 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 3489edd57c51..09c78d6781a7 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S@@ -1069,7 +1069,7 @@ alternative_else_nop_endif sub \dst, \dst, PAGE_SIZE .endm - .macro tramp_ventry, regsize = 64 + .macro tramp_ventry, vector_start, regsize .align 7 1: .if \regsize == 64
@@ -1092,10 +1092,10 @@ alternative_insn isb, nop, ARM64_WORKAROUND_QCOM_FALKOR_E1003 ldr x30, =vectors #endif alternative_if_not ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM - prfm plil1strm, [x30, #(1b - tramp_vectors)] + prfm plil1strm, [x30, #(1b - \vector_start)] alternative_else_nop_endif 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?
@@ -1114,19 +1114,21 @@ alternative_else_nop_endif sb .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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