int tmp, err = 0;
tmp = 0;
- __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
+ savesegment(gs, tmp);
err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
- __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
+ savesegment(fs, tmp);
err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
err |= __put_user(regs->xes, (unsigned int __user *)&sc->es);
esp = (unsigned long) ka->sa.sa_restorer;
}
- return (void __user *)((esp - frame_size) & -8ul);
+ esp -= frame_size;
+ /* Align the stack pointer according to the i386 ABI,
+ * i.e. so that on function entry ((sp + 4) & 15) == 0. */
+ esp = ((esp + 4) & -16ul) - 4;
+ return (void __user *) esp;
}
/* These symbols are defined with the addresses in the vsyscall page.
* We want the common case to go fast, which
* is why we may in certain cases get here from
* kernel mode. Just return without doing anything
- * if so.
+ * if so. vm86 regs switched out by assembly code
+ * before reaching here, so testing against kernel
+ * CS suffices.
*/
if (!user_mode(regs))
return 1;