Because fuword on AMD64 returns 64bit long integer -1 on fault, clear

entire %rax to zero instead of only clearing %eax, otherwise it will leave garbage data in upper 32 bits.
2006-08-15 12:45:51 +00:00 · 2006-08-15 12:45:51 +00:00 · 2328274aec
commit 2328274aec
parent b4359bd8e5
1 changed files with 1 additions and 1 deletions
--- a/sys/amd64/amd64/support.S
+++ b/sys/amd64/amd64/support.S
@ -412,7 +412,7 @@ ENTRY(fubyte)
 	ALIGN_TEXT
 fusufault:
 	movq	PCPU(CURPCB),%rcx
-	xorl	%eax,%eax
+	xorq	%rax,%rax
 	movq	%rax,PCB_ONFAULT(%rcx)
 	decq	%rax
 	ret