x86: ia32_signal: introduce {get|set}_user_seg()

Impact: cleanup

Introduce {get|set}_user_seg() and loadsegment_xx() macros to make code clean.

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

1 files changed, 18 insertions, 20 deletions

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 8dd0903da08b..588a7aa937e1 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -188,6 +188,14 @@ asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
 /*
  * Do a signal return; undo the signal stack.
  */
+#define loadsegment_gs(v)       load_gs_index(v)
+#define loadsegment_fs(v)       loadsegment(fs, v)
+#define loadsegment_ds(v)       loadsegment(ds, v)
+#define loadsegment_es(v)       loadsegment(es, v)
+
+#define get_user_seg(seg)       ({ unsigned int v; savesegment(seg, v); v; })
+#define set_user_seg(seg, v)    loadsegment_##seg(v)
+
 #define COPY(x)                 {               \
         get_user_ex(regs->x, &sc->x);           \
 }
@@ -203,19 +211,18 @@ asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
 } while (0)
 
 #define RELOAD_SEG(seg)         {               \
-        unsigned int cur, pre;                  \
-        get_user_ex(pre, &sc->seg);             \
-        savesegment(seg, cur);                  \
+        unsigned int pre = GET_SEG(seg);        \
+        unsigned int cur = get_user_seg(seg);   \
         pre |= 3;                               \
         if (pre != cur)                         \
-                loadsegment(seg, pre);          \
+                set_user_seg(seg, pre);         \
 }
 
 static int ia32_restore_sigcontext(struct pt_regs *regs,
                                    struct sigcontext_ia32 __user *sc,
                                    unsigned int *pax)
 {
-        unsigned int tmpflags, gs, oldgs, err = 0;
+        unsigned int tmpflags, err = 0;
         void __user *buf;
         u32 tmp;
 
@@ -229,12 +236,7 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
                  * the handler, but does not clobber them at least in the
                  * normal case.
                  */
-                get_user_ex(gs, &sc->gs);
-                gs |= 3;
-                savesegment(gs, oldgs);
-                if (gs != oldgs)
-                        load_gs_index(gs);
-
+                RELOAD_SEG(gs);
                 RELOAD_SEG(fs);
                 RELOAD_SEG(ds);
                 RELOAD_SEG(es);
@@ -333,17 +335,13 @@ static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
                                  void __user *fpstate,
                                  struct pt_regs *regs, unsigned int mask)
 {
-        int tmp, err = 0;
+        int err = 0;
 
         put_user_try {
-                savesegment(gs, tmp);
-                put_user_ex(tmp, (unsigned int __user *)&sc->gs);
-                savesegment(fs, tmp);
-                put_user_ex(tmp, (unsigned int __user *)&sc->fs);
-                savesegment(ds, tmp);
-                put_user_ex(tmp, (unsigned int __user *)&sc->ds);
-                savesegment(es, tmp);
-                put_user_ex(tmp, (unsigned int __user *)&sc->es);
+                put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs);
+                put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs);
+                put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds);
+                put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es);
 
                 put_user_ex(regs->di, &sc->di);
                 put_user_ex(regs->si, &sc->si);