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Commit a967bb3f authored by Hiroshi Shimamoto's avatar Hiroshi Shimamoto Committed by Ingo Molnar
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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: default avatarHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 8801ead4

arch/x86/ia32/ia32_signal.c

+18 −20
Original line number Diff line number Diff line
@@ -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);