From ef151fffb14eac19a19121dfb4c1e015e7470038 Mon Sep 17 00:00:00 2001 From: Alejandro Soto Date: Wed, 14 Dec 2022 22:24:58 -0600 Subject: Fix register corruption when interrupting a load-store --- tb/sim/irq.S | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'tb/sim') diff --git a/tb/sim/irq.S b/tb/sim/irq.S index 35ce2c9..2ed4621 100644 --- a/tb/sim/irq.S +++ b/tb/sim/irq.S @@ -29,6 +29,25 @@ reset: str r1, [r2, #4] .wfi: + # Una secuencia de load-stores intensos como esta se encuentra en el + # código de calibración de delay loop del kernel. Antes del commit + # con título 'Fix register corruption when interrupting a load-store', + # una IRQ justo aquí provcaba que el core entrara en un estado indefinido. + # En el caso de Linux, eso resultaba en kernel panics indepurables. + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] + ldr r10, [r2] tst r0, r0 beq .wfi -- cgit v1.2.3