From: Wei Liu <wei.liu2@citrix.com>
Date: Wed, 24 Jan 2018 20:26:26 +0000 (+0000)
Subject: x86: fix GET_STACK_END
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=8155476765a5bdecea1534b46562cf28e0113a9a;p=people%2Fdariof%2Fxen.git

x86: fix GET_STACK_END

AIUI the purpose of having the .if directive is to make GET_STACK_END
work with any general purpose registers. The code as-is would produce
the wrong result for r8. Fix it.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/include/asm-x86/asm_defns.h b/xen/include/asm-x86/asm_defns.h
index d2d91ca1fa..6a2b833db6 100644
--- a/xen/include/asm-x86/asm_defns.h
+++ b/xen/include/asm-x86/asm_defns.h
@@ -120,7 +120,7 @@ void ret_from_intr(void);
 
 #define STACK_CPUINFO_FIELD(field) (1 - CPUINFO_sizeof + CPUINFO_##field)
 #define GET_STACK_END(reg)                        \
-        .if .Lr##reg > 8;                         \
+        .if .Lr##reg >= 8;                        \
         movq $STACK_SIZE-1, %r##reg;              \
         .else;                                    \
         movl $STACK_SIZE-1, %e##reg;              \