1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/types.h> 4 #include <linux/thread_info.h> 5 #include <linux/uaccess.h> 6 #include <linux/sched.h> 7 8 #include <asm/sigcontext.h> 9 #include <asm/fpumacro.h> 10 #include <asm/ptrace.h> 11 #include <asm/switch_to.h> 12 13 #include "sigutil.h" 14 15 int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) 16 { 17 int err = 0; 18 #ifdef CONFIG_SMP 19 if (test_tsk_thread_flag(current, TIF_USEDFPU)) { 20 put_psr(get_psr() | PSR_EF); 21 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, 22 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); 23 regs->psr &= ~(PSR_EF); 24 clear_tsk_thread_flag(current, TIF_USEDFPU); 25 } 26 #else 27 if (current == last_task_used_math) { 28 put_psr(get_psr() | PSR_EF); 29 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, 30 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); 31 last_task_used_math = NULL; 32 regs->psr &= ~(PSR_EF); 33 } 34 #endif 35 err |= __copy_to_user(&fpu->si_float_regs[0], 36 ¤t->thread.float_regs[0], 37 (sizeof(unsigned long) * 32)); 38 err |= __put_user(current->thread.fsr, &fpu->si_fsr); 39 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); 40 if (current->thread.fpqdepth != 0) 41 err |= __copy_to_user(&fpu->si_fpqueue[0], 42 ¤t->thread.fpqueue[0], 43 ((sizeof(unsigned long) + 44 (sizeof(unsigned long *)))*16)); 45 clear_used_math(); 46 return err; 47 } 48 49 int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) 50 { 51 int err; 52 53 if (((unsigned long) fpu) & 3) 54 return -EFAULT; 55 56 #ifdef CONFIG_SMP 57 if (test_tsk_thread_flag(current, TIF_USEDFPU)) 58 regs->psr &= ~PSR_EF; 59 #else 60 if (current == last_task_used_math) { 61 last_task_used_math = NULL; 62 regs->psr &= ~PSR_EF; 63 } 64 #endif 65 set_used_math(); 66 clear_tsk_thread_flag(current, TIF_USEDFPU); 67 68 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) 69 return -EFAULT; 70 71 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], 72 (sizeof(unsigned long) * 32)); 73 err |= __get_user(current->thread.fsr, &fpu->si_fsr); 74 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); 75 if (current->thread.fpqdepth != 0) 76 err |= __copy_from_user(¤t->thread.fpqueue[0], 77 &fpu->si_fpqueue[0], 78 ((sizeof(unsigned long) + 79 (sizeof(unsigned long *)))*16)); 80 return err; 81 } 82 83 int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) 84 { 85 int i, err = __put_user(wsaved, &rwin->wsaved); 86 87 for (i = 0; i < wsaved; i++) { 88 struct reg_window32 *rp; 89 unsigned long fp; 90 91 rp = ¤t_thread_info()->reg_window[i]; 92 fp = current_thread_info()->rwbuf_stkptrs[i]; 93 err |= copy_to_user(&rwin->reg_window[i], rp, 94 sizeof(struct reg_window32)); 95 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); 96 } 97 return err; 98 } 99 100 int restore_rwin_state(__siginfo_rwin_t __user *rp) 101 { 102 struct thread_info *t = current_thread_info(); 103 int i, wsaved, err; 104 105 if (((unsigned long) rp) & 3) 106 return -EFAULT; 107 108 get_user(wsaved, &rp->wsaved); 109 if (wsaved > NSWINS) 110 return -EFAULT; 111 112 err = 0; 113 for (i = 0; i < wsaved; i++) { 114 err |= copy_from_user(&t->reg_window[i], 115 &rp->reg_window[i], 116 sizeof(struct reg_window32)); 117 err |= __get_user(t->rwbuf_stkptrs[i], 118 &rp->rwbuf_stkptrs[i]); 119 } 120 if (err) 121 return err; 122 123 t->w_saved = wsaved; 124 synchronize_user_stack(); 125 if (t->w_saved) 126 return -EFAULT; 127 return 0; 128 129 } 130