[PATCH v9 12/18] arm64: kexec: arm64_relocate_new_kernel don't use x0 as temp
From: Pavel Tatashin <pasha.tatashin@soleen.com>
Date: 2020-03-26 03:24:45
Also in:
linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
x0 will contain the only argument to arm64_relocate_new_kernel; don't use it as a temp. Reassigned registers to free-up x0. Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> --- arch/arm64/kernel/relocate_kernel.S | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S
index e9c974ea4717..41f9c95fabe8 100644
--- a/arch/arm64/kernel/relocate_kernel.S
+++ b/arch/arm64/kernel/relocate_kernel.S@@ -32,14 +32,14 @@ ENTRY(arm64_relocate_new_kernel) mov x14, xzr /* x14 = entry ptr */ mov x13, xzr /* x13 = copy dest */ /* Clear the sctlr_el2 flags. */ - mrs x0, CurrentEL - cmp x0, #CurrentEL_EL2 + mrs x2, CurrentEL + cmp x2, #CurrentEL_EL2 b.ne 1f - mrs x0, sctlr_el2 + mrs x2, sctlr_el2 ldr x1, =SCTLR_ELx_FLAGS - bic x0, x0, x1 + bic x2, x2, x1 pre_disable_mmu_workaround - msr sctlr_el2, x0 + msr sctlr_el2, x2 isb 1: /* Check if the new image needs relocation. */ tbnz x16, IND_DONE_BIT, .Ldone
@@ -51,17 +51,17 @@ ENTRY(arm64_relocate_new_kernel) tbz x16, IND_SOURCE_BIT, .Ltest_indirection /* Invalidate dest page to PoC. */ - mov x0, x13 - add x20, x0, #PAGE_SIZE + mov x2, x13 + add x20, x2, #PAGE_SIZE sub x1, x15, #1 - bic x0, x0, x1 -2: dc ivac, x0 - add x0, x0, x15 - cmp x0, x20 + bic x2, x2, x1 +2: dc ivac, x2 + add x2, x2, x15 + cmp x2, x20 b.lo 2b dsb sy - copy_page x13, x12, x0, x1, x2, x3, x4, x5, x6, x7 + copy_page x13, x12, x1, x2, x3, x4, x5, x6, x7, x8 b .Lnext .Ltest_indirection: tbz x16, IND_INDIRECTION_BIT, .Ltest_destination
--
2.17.1
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