x86: ia32_signal: introduce COPY_SEG_CPL3

Impact: cleanup

Introduce COPY_SEG_CPL3 for ia32_restore_sigcontext().

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 610a177..fe44c31 100644 (file)
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -201,6 +201,12 @@ struct rt_sigframe
        err |= __get_user(regs->x, &sc->x);     \
 }
 
+#define COPY_SEG_CPL3(seg)     {                       \
+               unsigned short tmp;                     \
+               err |= __get_user(tmp, &sc->seg);       \
+               regs->seg = tmp | 3;                    \
+}
+
 #define RELOAD_SEG(seg,mask)                                           \
        { unsigned int cur;                                             \
          unsigned short pre;                                           \
@@ -246,10 +252,8 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
        COPY(dx); COPY(cx); COPY(ip);
        /* Don't touch extended registers */
 
-       err |= __get_user(regs->cs, &sc->cs);
-       regs->cs |= 3;
-       err |= __get_user(regs->ss, &sc->ss);
-       regs->ss |= 3;
+       COPY_SEG_CPL3(cs);
+       COPY_SEG_CPL3(ss);
 
        err |= __get_user(tmpflags, &sc->flags);
        regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);