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

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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>
This commit is contained in:
Hiroshi Shimamoto 2009-02-20 19:00:54 -08:00 committed by Ingo Molnar
parent 8801ead40c
commit a967bb3fbe
1 changed files with 18 additions and 20 deletions
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38
arch/x86/ia32/ia32_signal.c
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@ -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);