x86, xsave: reorganization of signal save/restore fpstate code layout
move 64bit routines that saves/restores fpstate in/from user stack from
signal_64.c to xsave.c
restore_i387_xstate() now handles the condition when user passes
NULL fpstate.
Other misc changes for prepartion of xsave/xrstor sigcontext support.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/signal_32.c b/arch/x86/kernel/signal_32.c
index 19a7a56..690cc61 100644
--- a/arch/x86/kernel/signal_32.c
+++ b/arch/x86/kernel/signal_32.c
@@ -159,28 +159,14 @@
}
{
- struct _fpstate __user *buf;
+ void __user *buf;
err |= __get_user(buf, &sc->fpstate);
- if (buf) {
- if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
- goto badframe;
- err |= restore_i387(buf);
- } else {
- struct task_struct *me = current;
-
- if (used_math()) {
- clear_fpu(me);
- clear_used_math();
- }
- }
+ err |= restore_i387_xstate(buf);
}
err |= __get_user(*pax, &sc->ax);
return err;
-
-badframe:
- return 1;
}
asmlinkage unsigned long sys_sigreturn(unsigned long __unused)
@@ -262,7 +248,7 @@
* Set up a signal frame.
*/
static int
-setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
+setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
struct pt_regs *regs, unsigned long mask)
{
int tmp, err = 0;
@@ -289,7 +275,7 @@
err |= __put_user(regs->sp, &sc->sp_at_signal);
err |= __put_user(regs->ss, (unsigned int __user *)&sc->ss);
- tmp = save_i387(fpstate);
+ tmp = save_i387_xstate(fpstate);
if (tmp < 0)
err = 1;
else
@@ -307,7 +293,7 @@
*/
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
- struct _fpstate **fpstate)
+ void **fpstate)
{
unsigned long sp;
@@ -356,7 +342,7 @@
void __user *restorer;
int err = 0;
int usig;
- struct _fpstate __user *fpstate = NULL;
+ void __user *fpstate = NULL;
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
@@ -434,7 +420,7 @@
void __user *restorer;
int err = 0;
int usig;
- struct _fpstate __user *fpstate = NULL;
+ void __user *fpstate = NULL;
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);