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 #include <asm/switch_to.h> 11 12 #include "sigutil.h" 13 14 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) 15 { 16 int err = 0; 17 #ifdef CONFIG_SMP 18 if (test_tsk_thread_flag(current, TIF_USEDFPU)) { 19 put_psr(get_psr() | PSR_EF); 20 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, 21 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); 22 regs->psr &= ~(PSR_EF); 23 clear_tsk_thread_flag(current, TIF_USEDFPU); 24 } 25 #else 26 if (current == last_task_used_math) { 27 put_psr(get_psr() | PSR_EF); 28 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, 29 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); 30 last_task_used_math = NULL; 31 regs->psr &= ~(PSR_EF); 32 } 33 #endif 34 err |= __copy_to_user(&fpu->si_float_regs[0], 35 ¤t->thread.float_regs[0], 36 (sizeof(unsigned long) * 32)); 37 err |= __put_user(current->thread.fsr, &fpu->si_fsr); 38 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); 39 if (current->thread.fpqdepth != 0) 40 err |= __copy_to_user(&fpu->si_fpqueue[0], 41 ¤t->thread.fpqueue[0], 42 ((sizeof(unsigned long) + 43 (sizeof(unsigned long *)))*16)); 44 clear_used_math(); 45 return err; 46 } 47 48 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) 49 { 50 int err; 51 #ifdef CONFIG_SMP 52 if (test_tsk_thread_flag(current, TIF_USEDFPU)) 53 regs->psr &= ~PSR_EF; 54 #else 55 if (current == last_task_used_math) { 56 last_task_used_math = NULL; 57 regs->psr &= ~PSR_EF; 58 } 59 #endif 60 set_used_math(); 61 clear_tsk_thread_flag(current, TIF_USEDFPU); 62 63 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) 64 return -EFAULT; 65 66 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], 67 (sizeof(unsigned long) * 32)); 68 err |= __get_user(current->thread.fsr, &fpu->si_fsr); 69 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); 70 if (current->thread.fpqdepth != 0) 71 err |= __copy_from_user(¤t->thread.fpqueue[0], 72 &fpu->si_fpqueue[0], 73 ((sizeof(unsigned long) + 74 (sizeof(unsigned long *)))*16)); 75 return err; 76 } 77 78 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) 79 { 80 int i, err = __put_user(wsaved, &rwin->wsaved); 81 82 for (i = 0; i < wsaved; i++) { 83 struct reg_window32 *rp; 84 unsigned long fp; 85 86 rp = ¤t_thread_info()->reg_window[i]; 87 fp = current_thread_info()->rwbuf_stkptrs[i]; 88 err |= copy_to_user(&rwin->reg_window[i], rp, 89 sizeof(struct reg_window32)); 90 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); 91 } 92 return err; 93 } 94 95 int restore_rwin_state(__siginfo_rwin_t __user *rp) 96 { 97 struct thread_info *t = current_thread_info(); 98 int i, wsaved, err; 99 100 __get_user(wsaved, &rp->wsaved); 101 if (wsaved > NSWINS) 102 return -EFAULT; 103 104 err = 0; 105 for (i = 0; i < wsaved; i++) { 106 err |= copy_from_user(&t->reg_window[i], 107 &rp->reg_window[i], 108 sizeof(struct reg_window32)); 109 err |= __get_user(t->rwbuf_stkptrs[i], 110 &rp->rwbuf_stkptrs[i]); 111 } 112 if (err) 113 return err; 114 115 t->w_saved = wsaved; 116 synchronize_user_stack(); 117 if (t->w_saved) 118 return -EFAULT; 119 return 0; 120 121 } 122