[PATCH v10 12/18] arm64: kexec: arm64_relocate_new_kernel don't use x0 as temp
From: Pavel Tatashin <pasha.tatashin@soleen.com>
Date: 2021-01-25 19:44:31
Also in:
kexec, 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 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 <pasha.tatashin@soleen.com> Reviewed-by: James Morse <james.morse@arm.com> --- arch/arm64/kernel/relocate_kernel.S | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S
index 462ffbc37071..b78ea5de97a4 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
--
2.25.1
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