From b0c1f773889936934db2552f66921022bc89d6e1 Mon Sep 17 00:00:00 2001
From: Hansung Kim <hansung_kim@berkeley.edu>
Date: Fri, 29 Mar 2024 12:24:55 -0700
Subject: [PATCH] vx_start.S: Swizzle stack space

Striding stack space for threads by power-of-two risks possibilities of bank
conflicts or cache aliasing problems.  Add an extra offset of 4 bytes to avoid
this.
---
 kernel/src/vx_start.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/src/vx_start.S b/kernel/src/vx_start.S
index b5065c95..d2a81707 100644
--- a/kernel/src/vx_start.S
+++ b/kernel/src/vx_start.S
@@ -102,6 +102,8 @@ init_regs:
 #endif
   csrr  t0, VX_CSR_MHARTID
   sll   t1, t0, STACK_LOG2_SIZE
+  sll   t2, t0, 2
+  add   t1, t1, t2
   sub   sp, sp, t1
 
   # set thread pointer register