#include <linux/kernel.h> #include <linux/types.h> #include <linux/thread_info.h> #include <linux/uaccess.h> #include <linux/sched.h> #include <asm/sigcontext.h> #include <asm/fpumacro.h> #include <asm/ptrace.h> #include "sigutil.h" int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) { int err = 0; #ifdef CONFIG_SMP if (test_tsk_thread_flag(current, TIF_USEDFPU)) { put_psr(get_psr() | PSR_EF); fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); regs->psr &= ~(PSR_EF); clear_tsk_thread_flag(current, TIF_USEDFPU); } #else if (current == last_task_used_math) { put_psr(get_psr() | PSR_EF); fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); last_task_used_math = NULL; regs->psr &= ~(PSR_EF); } #endif err |= __copy_to_user(&fpu->si_float_regs[0], ¤t->thread.float_regs[0], (sizeof(unsigned long) * 32)); err |= __put_user(current->thread.fsr, &fpu->si_fsr); err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); if (current->thread.fpqdepth != 0) err |= __copy_to_user(&fpu->si_fpqueue[0], ¤t->thread.fpqueue[0], ((sizeof(unsigned long) + (sizeof(unsigned long *)))*16)); clear_used_math(); return err; } int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) { int err; #ifdef CONFIG_SMP if (test_tsk_thread_flag(current, TIF_USEDFPU)) regs->psr &= ~PSR_EF; #else if (current == last_task_used_math) { last_task_used_math = NULL; regs->psr &= ~PSR_EF; } #endif set_used_math(); clear_tsk_thread_flag(current, TIF_USEDFPU); if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) return -EFAULT; err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], (sizeof(unsigned long) * 32)); err |= __get_user(current->thread.fsr, &fpu->si_fsr); err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); if (current->thread.fpqdepth != 0) err |= __copy_from_user(¤t->thread.fpqueue[0], &fpu->si_fpqueue[0], ((sizeof(unsigned long) + (sizeof(unsigned long *)))*16)); return err; } int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) { int i, err = __put_user(wsaved, &rwin->wsaved); for (i = 0; i < wsaved; i++) { struct reg_window32 *rp; unsigned long fp; rp = ¤t_thread_info()->reg_window[i]; fp = current_thread_info()->rwbuf_stkptrs[i]; err |= copy_to_user(&rwin->reg_window[i], rp, sizeof(struct reg_window32)); err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); } return err; } int restore_rwin_state(__siginfo_rwin_t __user *rp) { struct thread_info *t = current_thread_info(); int i, wsaved, err; __get_user(wsaved, &rp->wsaved); if (wsaved > NSWINS) return -EFAULT; err = 0; for (i = 0; i < wsaved; i++) { err |= copy_from_user(&t->reg_window[i], &rp->reg_window[i], sizeof(struct reg_window32)); err |= __get_user(t->rwbuf_stkptrs[i], &rp->rwbuf_stkptrs[i]); } if (err) return err; t->w_saved = wsaved; synchronize_user_stack(); if (t->w_saved) return -EFAULT; return 0; }