1 // SPDX-License-Identifier: GPL-2.0 1 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, __sig 16 { 17 int err = 0; 18 #ifdef CONFIG_SMP 19 if (test_tsk_thread_flag(current, TIF_ 20 put_psr(get_psr() | PSR_EF); 21 fpsave(¤t->thread.float_ 22 ¤t->thread.fpqueu 23 regs->psr &= ~(PSR_EF); 24 clear_tsk_thread_flag(current, 25 } 26 #else 27 if (current == last_task_used_math) { 28 put_psr(get_psr() | PSR_EF); 29 fpsave(¤t->thread.float_ 30 ¤t->thread.fpqueu 31 last_task_used_math = NULL; 32 regs->psr &= ~(PSR_EF); 33 } 34 #endif 35 err |= __copy_to_user(&fpu->si_float_r 36 ¤t->thread 37 (sizeof(unsigned 38 err |= __put_user(current->thread.fsr, 39 err |= __put_user(current->thread.fpqd 40 if (current->thread.fpqdepth != 0) 41 err |= __copy_to_user(&fpu->si 42 ¤t 43 ((sizeof 44 (sizeof( 45 clear_used_math(); 46 return err; 47 } 48 49 int restore_fpu_state(struct pt_regs *regs, __ 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_ 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_USE 67 68 if (!access_ok(fpu, sizeof(*fpu))) 69 return -EFAULT; 70 71 err = __copy_from_user(¤t->threa 72 (sizeof(unsigne 73 err |= __get_user(current->thread.fsr, 74 err |= __get_user(current->thread.fpqd 75 if (current->thread.fpqdepth != 0) 76 err |= __copy_from_user(&curre 77 &fpu-> 78 ((size 79 (sizeo 80 return err; 81 } 82 83 int save_rwin_state(int wsaved, __siginfo_rwin 84 { 85 int i, err = __put_user(wsaved, &rwin- 86 87 for (i = 0; i < wsaved; i++) { 88 struct reg_window32 *rp; 89 unsigned long fp; 90 91 rp = ¤t_thread_info()->r 92 fp = current_thread_info()->rw 93 err |= copy_to_user(&rwin->reg 94 sizeof(str 95 err |= __put_user(fp, &rwin->r 96 } 97 return err; 98 } 99 100 int restore_rwin_state(__siginfo_rwin_t __user 101 { 102 struct thread_info *t = current_thread 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_ 115 &rp->reg 116 sizeof(s 117 err |= __get_user(t->rwbuf_stk 118 &rp->rwbuf_s 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
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