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Subject[PATCH v10 12/18] arm64: kexec: arm64_relocate_new_kernel don't use x0 as temp
Date
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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