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diff --git a/sys/arm64/arm64/exception.S b/sys/arm64/arm64/exception.S
--- a/sys/arm64/arm64/exception.S
+++ b/sys/arm64/arm64/exception.S
@@ -41,33 +41,33 @@
.macro save_registers_head el
.if \el == 1
mov x18, sp
- sub sp, sp, #128
+ stp x0, x1, [sp, #(TF_X - TF_SIZE - 128)]!
+.else
+ stp x0, x1, [sp, #(TF_X - TF_SIZE)]!
.endif
- sub sp, sp, #(TF_SIZE)
- stp x28, x29, [sp, #(TF_X + 28 * 8)]
- stp x26, x27, [sp, #(TF_X + 26 * 8)]
- stp x24, x25, [sp, #(TF_X + 24 * 8)]
- stp x22, x23, [sp, #(TF_X + 22 * 8)]
- stp x20, x21, [sp, #(TF_X + 20 * 8)]
- stp x18, x19, [sp, #(TF_X + 18 * 8)]
- stp x16, x17, [sp, #(TF_X + 16 * 8)]
- stp x14, x15, [sp, #(TF_X + 14 * 8)]
- stp x12, x13, [sp, #(TF_X + 12 * 8)]
- stp x10, x11, [sp, #(TF_X + 10 * 8)]
- stp x8, x9, [sp, #(TF_X + 8 * 8)]
- stp x6, x7, [sp, #(TF_X + 6 * 8)]
- stp x4, x5, [sp, #(TF_X + 4 * 8)]
- stp x2, x3, [sp, #(TF_X + 2 * 8)]
- stp x0, x1, [sp, #(TF_X + 0 * 8)]
+ stp x2, x3, [sp, #(2 * 8)]
+ stp x4, x5, [sp, #(4 * 8)]
+ stp x6, x7, [sp, #(6 * 8)]
+ stp x8, x9, [sp, #(8 * 8)]
+ stp x10, x11, [sp, #(10 * 8)]
+ stp x12, x13, [sp, #(12 * 8)]
+ stp x14, x15, [sp, #(14 * 8)]
+ stp x16, x17, [sp, #(16 * 8)]
+ stp x18, x19, [sp, #(18 * 8)]
+ stp x20, x21, [sp, #(20 * 8)]
+ stp x22, x23, [sp, #(22 * 8)]
+ stp x24, x25, [sp, #(24 * 8)]
+ stp x26, x27, [sp, #(26 * 8)]
+ stp x28, x29, [sp, #(28 * 8)]
mrs x10, elr_el1
mrs x11, spsr_el1
mrs x12, esr_el1
.if \el == 0
mrs x18, sp_el0
.endif
- str x10, [sp, #(TF_ELR)]
- stp w11, w12, [sp, #(TF_SPSR)]
- stp x18, lr, [sp, #(TF_SP)]
+ str x10, [sp, #(TF_ELR - TF_X)]!
+ stp w11, w12, [sp, #(TF_SPSR - TF_ELR)]!
+ stp x18, lr, [sp, #(TF_SP - TF_SPSR)]!
mrs x18, tpidr_el1
add x29, sp, #(TF_SIZE)
.endm

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