From d2b2dff7490f2c4b8e91f79940fc46f0361c216c Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Tue, 4 Oct 2022 11:52:57 -0400
Subject: fix copyout() to refuse to write a read-only page

---
 kernel/trampoline.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/trampoline.S')

diff --git a/kernel/trampoline.S b/kernel/trampoline.S
index d7308cc..693f8a1 100644
--- a/kernel/trampoline.S
+++ b/kernel/trampoline.S
@@ -15,6 +15,7 @@
 
 .section trampsec
 .globl trampoline
+.globl usertrap
 trampoline:
 .align 4
 .globl uservec
@@ -80,7 +81,6 @@ uservec:
         # load the address of usertrap(), from p->trapframe->kernel_trap
         ld t0, 16(a0)
 
-
         # fetch the kernel page table address, from p->trapframe->kernel_satp.
         ld t1, 0(a0)
 
-- 
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