From 34a1175291f9531e85afdb89aaa77707f45fc8e4 Mon Sep 17 00:00:00 2001
From: eistar <33970527+eistar@users.noreply.github.com>
Date: Tue, 1 Feb 2022 10:34:16 +0800
Subject: Reverse memcpy direction when evicts a page. (#34)

In "evict" function in v/vm.c, when evict a dirty page in user space, memcpy should be from that page, rather than to evicted page.
---
 v/vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'v')

diff --git a/v/vm.c b/v/vm.c
index 9802fb7..277b67c 100644
--- a/v/vm.c
+++ b/v/vm.c
@@ -120,7 +120,7 @@ static void evict(unsigned long addr)
     uintptr_t sstatus = set_csr(sstatus, SSTATUS_SUM);
     if (memcmp((void*)addr, uva2kva(addr), PGSIZE)) {
       assert(user_llpt[addr/PGSIZE] & PTE_D);
-      memcpy((void*)addr, uva2kva(addr), PGSIZE);
+      memcpy(uva2kva(addr), (void*)addr, PGSIZE);
     }
     write_csr(sstatus, sstatus);
 
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