#include <linux/kprobes.h>
#include <linux/random.h>
#include <linux/module.h>
+#include <linux/init_task.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/vtimer.h>
asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
+/* FPU save area for the init task */
+__vector128 init_task_fpu_regs[__NUM_VXRS] __init_task_data;
+
/*
* Return saved PC of a blocked thread. used in kernel/sched.
* resume in entry.S does not create a new stack frame, it
void arch_release_task_struct(struct task_struct *tsk)
{
- if (tsk->thread.vxrs)
- kfree(tsk->thread.vxrs);
+ /* Free either the floating-point or the vector register save area */
+ kfree(tsk->thread.fpu.regs);
+}
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+ size_t fpu_regs_size;
+
+ *dst = *src;
+
+ /*
+ * If the vector extension is available, it is enabled for all tasks,
+ * and, thus, the FPU register save area must be allocated accordingly.
+ */
+ fpu_regs_size = MACHINE_HAS_VX ? sizeof(__vector128) * __NUM_VXRS
+ : sizeof(freg_t) * __NUM_FPRS;
+ dst->thread.fpu.regs = kzalloc(fpu_regs_size, GFP_KERNEL|__GFP_REPEAT);
+ if (!dst->thread.fpu.regs)
+ return -ENOMEM;
+
+ /*
+ * Save the floating-point or vector register state of the current
+ * task and set the CIF_FPU flag to lazy restore the FPU register
+ * state when returning to user space.
+ */
+ save_fpu_regs();
+ dst->thread.fpu.fpc = current->thread.fpu.fpc;
+ memcpy(dst->thread.fpu.regs, current->thread.fpu.regs, fpu_regs_size);
+
+ return 0;
}
int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
/* Don't copy runtime instrumentation info */
p->thread.ri_cb = NULL;
- p->thread.ri_signum = 0;
frame->childregs.psw.mask &= ~PSW_MASK_RI;
- /* Save the fpu registers to new thread structure. */
- save_fp_ctl(&p->thread.fp_regs.fpc);
- save_fp_regs(p->thread.fp_regs.fprs);
- p->thread.fp_regs.pad = 0;
- p->thread.vxrs = NULL;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS) {
unsigned long tls = frame->childregs.gprs[6];
asmlinkage void execve_tail(void)
{
- current->thread.fp_regs.fpc = 0;
+ current->thread.fpu.fpc = 0;
asm volatile("sfpc %0" : : "d" (0));
}
*/
int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
{
- save_fp_ctl(&fpregs->fpc);
- save_fp_regs(fpregs->fprs);
+ save_fpu_regs();
+ fpregs->fpc = current->thread.fpu.fpc;
+ fpregs->pad = 0;
+ if (MACHINE_HAS_VX)
+ convert_vx_to_fp((freg_t *)&fpregs->fprs,
+ current->thread.fpu.vxrs);
+ else
+ memcpy(&fpregs->fprs, current->thread.fpu.fprs,
+ sizeof(fpregs->fprs));
return 1;
}
EXPORT_SYMBOL(dump_fpu);
static inline unsigned long brk_rnd(void)
{
- /* 8MB for 32bit, 1GB for 64bit */
- if (is_32bit_task())
- return (get_random_int() & 0x7ffUL) << PAGE_SHIFT;
- else
- return (get_random_int() & 0x3ffffUL) << PAGE_SHIFT;
+ return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;
}
unsigned long arch_randomize_brk(struct mm_struct *mm)