From: Andrew Waterman <waterman@cs.berkeley.edu>
Date: Sat, 13 Dec 2014 00:07:46 +0000 (-0800)
Subject: Use user stack in supervisor mode
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1d8e02859be502647b52a71623f543712c869b2f;p=riscv-tests.git

Use user stack in supervisor mode

This fixes a race condition, as there was only one kernel stack.
---

diff --git a/benchmarks/common/crt.S b/benchmarks/common/crt.S
index 24d22e8..2c004d1 100644
--- a/benchmarks/common/crt.S
+++ b/benchmarks/common/crt.S
@@ -126,15 +126,7 @@ _start:
   sret
 
 trap_entry:
-  csrw sup0, sp
-  csrw sup1, t0
-  csrr t0, status
-  andi t0, t0, SR_PS
-  bnez t0, 1f
-  la sp, kstacktop
-1:
   addi sp, sp, -272
-  csrr t0, sup1
 
   SREG x1, 8(sp)
   SREG x2, 16(sp)
@@ -216,13 +208,8 @@ trap_entry:
   LREG x30, 240(sp)
   LREG x31, 248(sp)
 
-  csrr sp, sup0
+  addi sp, sp, 272
   sret
 
-.bss
-.align 4
-.skip 4096
-kstacktop:
-
 .section .tbss
 tls_start: