From: Pavel Tatashin Date: Mon, 25 Jan 2021 19:19:17 +0000 (-0500) Subject: arm64: kexec: arm64_relocate_new_kernel don't use x0 as temp X-Git-Tag: v5.15~1622^2~20^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a360190e8a42d47ea80355f286939ba82b02405a;p=platform%2Fkernel%2Flinux-starfive.git arm64: kexec: arm64_relocate_new_kernel don't use x0 as temp x0 will contain the only argument to arm64_relocate_new_kernel; don't use it as a temp. Reassigned registers to free-up x0 so we won't need to copy argument, and can use it at the beginning and at the end of the function. Signed-off-by: Pavel Tatashin Reviewed-by: James Morse Link: https://lore.kernel.org/r/20210125191923.1060122-13-pasha.tatashin@soleen.com Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S index 462ffbc..b78ea5d 100644 --- a/arch/arm64/kernel/relocate_kernel.S +++ b/arch/arm64/kernel/relocate_kernel.S @@ -34,7 +34,7 @@ SYM_CODE_START(arm64_relocate_new_kernel) mov x13, xzr /* x13 = copy dest */ /* Check if the new image needs relocation. */ tbnz x16, IND_DONE_BIT, .Ldone - raw_dcache_line_size x15, x0 /* x15 = dcache line size */ + raw_dcache_line_size x15, x1 /* x15 = dcache line size */ .Lloop: and x12, x16, PAGE_MASK /* x12 = addr */ @@ -43,17 +43,17 @@ SYM_CODE_START(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