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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-04-03 20:38:02 +0200 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-04-09 16:49:33 +0200 |
| commit | 4897e36c8d37fe508a423d6d15a635aba2557b4e (patch) | |
| tree | 5cf15d3edd71a198eac4c4af5878d8f6d1948f09 /arch/arm | |
| parent | arm/arm64: KVM: Use HVC_RESET_VECTORS to reinit HYP mode (diff) | |
| download | linux-4897e36c8d37fe508a423d6d15a635aba2557b4e.tar.xz linux-4897e36c8d37fe508a423d6d15a635aba2557b4e.zip | |
ARM: decompressor: Remove __hyp_get_vectors usage
When the compressed image needs to be relocated to avoid being
overwritten by the decompression process, we need to relocate
the hyp vectors as well so that we can find them once the
decompression has taken effect.
For that, we perform the following calculation:
u32 v = __hyp_get_vectors();
v += offset;
__hyp_set_vectors(v);
But we're guaranteed that the initial value of v as returned by
__hyp_get_vectors is always __hyp_stub_vectors, because we have
just set it by calling __hyp_stub_install.
So let's remove the use of __hyp_get_vectors, and directly use
__hyp_stub_vectors instead.
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 9150f9732785..7c711ba61417 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -422,7 +422,17 @@ dtb_check_done: cmp r0, #HYP_MODE bne 1f - bl __hyp_get_vectors + /* + * Compute the address of the hyp vectors after relocation. + * This requires some arithmetic since we cannot directly + * reference __hyp_stub_vectors in a PC-relative way. + * Call __hyp_set_vectors with the new address so that we + * can HVC again after the copy. + */ +0: adr r0, 0b + movw r1, #:lower16:__hyp_stub_vectors - 0b + movt r1, #:upper16:__hyp_stub_vectors - 0b + add r0, r0, r1 sub r0, r0, r5 add r0, r0, r10 bl __hyp_set_vectors |