1 #include <linux/kernel.h> 2 #include <linux/types.h> 3 #include <linux/thread_info.h> 4 #include <linux/uaccess.h> 5 #include <linux/sched.h> 6 7 #include <asm/sigcontext.h> 8 #include <asm/fpumacro.h> 9 #include <asm/ptrace.h> 10 11 #include "sigutil.h" 12 13 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) 14 { 15 int err = 0; 16 #ifdef CONFIG_SMP 17 if (test_tsk_thread_flag(current, TIF_USEDFPU)) { 18 put_psr(get_psr() | PSR_EF); 19 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, 20 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); 21 regs->psr &= ~(PSR_EF); 22 clear_tsk_thread_flag(current, TIF_USEDFPU); 23 } 24 #else 25 if (current == last_task_used_math) { 26 put_psr(get_psr() | PSR_EF); 27 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, 28 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); 29 last_task_used_math = NULL; 30 regs->psr &= ~(PSR_EF); 31 } 32 #endif 33 err |= __copy_to_user(&fpu->si_float_regs[0], 34 ¤t->thread.float_regs[0], 35 (sizeof(unsigned long) * 32)); 36 err |= __put_user(current->thread.fsr, &fpu->si_fsr); 37 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); 38 if (current->thread.fpqdepth != 0) 39 err |= __copy_to_user(&fpu->si_fpqueue[0], 40 ¤t->thread.fpqueue[0], 41 ((sizeof(unsigned long) + 42 (sizeof(unsigned long *)))*16)); 43 clear_used_math(); 44 return err; 45 } 46 47 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) 48 { 49 int err; 50 #ifdef CONFIG_SMP 51 if (test_tsk_thread_flag(current, TIF_USEDFPU)) 52 regs->psr &= ~PSR_EF; 53 #else 54 if (current == last_task_used_math) { 55 last_task_used_math = NULL; 56 regs->psr &= ~PSR_EF; 57 } 58 #endif 59 set_used_math(); 60 clear_tsk_thread_flag(current, TIF_USEDFPU); 61 62 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) 63 return -EFAULT; 64 65 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], 66 (sizeof(unsigned long) * 32)); 67 err |= __get_user(current->thread.fsr, &fpu->si_fsr); 68 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); 69 if (current->thread.fpqdepth != 0) 70 err |= __copy_from_user(¤t->thread.fpqueue[0], 71 &fpu->si_fpqueue[0], 72 ((sizeof(unsigned long) + 73 (sizeof(unsigned long *)))*16)); 74 return err; 75 } 76 77 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) 78 { 79 int i, err = __put_user(wsaved, &rwin->wsaved); 80 81 for (i = 0; i < wsaved; i++) { 82 struct reg_window32 *rp; 83 unsigned long fp; 84 85 rp = ¤t_thread_info()->reg_window[i]; 86 fp = current_thread_info()->rwbuf_stkptrs[i]; 87 err |= copy_to_user(&rwin->reg_window[i], rp, 88 sizeof(struct reg_window32)); 89 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); 90 } 91 return err; 92 } 93 94 int restore_rwin_state(__siginfo_rwin_t __user *rp) 95 { 96 struct thread_info *t = current_thread_info(); 97 int i, wsaved, err; 98 99 __get_user(wsaved, &rp->wsaved); 100 if (wsaved > NSWINS) 101 return -EFAULT; 102 103 err = 0; 104 for (i = 0; i < wsaved; i++) { 105 err |= copy_from_user(&t->reg_window[i], 106 &rp->reg_window[i], 107 sizeof(struct reg_window32)); 108 err |= __get_user(t->rwbuf_stkptrs[i], 109 &rp->rwbuf_stkptrs[i]); 110 } 111 if (err) 112 return err; 113 114 t->w_saved = wsaved; 115 synchronize_user_stack(); 116 if (t->w_saved) 117 return -EFAULT; 118 return 0; 119 120 } 121