| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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/errno.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 | unsigned long *fpregs = current_thread_info()->fpregs; |
| 18 | unsigned long fprs; |
| 19 | int err = 0; |
| 20 | |
| 21 | fprs = current_thread_info()->fpsaved[0]; |
| 22 | if (fprs & FPRS_DL) |
| 23 | err |= copy_to_user(&fpu->si_float_regs[0], fpregs, |
| 24 | (sizeof(unsigned int) * 32)); |
| 25 | if (fprs & FPRS_DU) |
| 26 | err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16, |
| 27 | (sizeof(unsigned int) * 32)); |
| 28 | err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr); |
| 29 | err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr); |
| 30 | err |= __put_user(fprs, &fpu->si_fprs); |
| 31 | |
| 32 | return err; |
| 33 | } |
| 34 | |
| 35 | int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) |
| 36 | { |
| 37 | unsigned long *fpregs = current_thread_info()->fpregs; |
| 38 | unsigned long fprs; |
| 39 | int err; |
| 40 | |
| 41 | if (((unsigned long) fpu) & 7) |
| 42 | return -EFAULT; |
| 43 | |
| 44 | err = get_user(fprs, &fpu->si_fprs); |
| 45 | fprs_write(0); |
| 46 | regs->tstate &= ~TSTATE_PEF; |
| 47 | if (fprs & FPRS_DL) |
| 48 | err |= copy_from_user(fpregs, &fpu->si_float_regs[0], |
| 49 | (sizeof(unsigned int) * 32)); |
| 50 | if (fprs & FPRS_DU) |
| 51 | err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], |
| 52 | (sizeof(unsigned int) * 32)); |
| 53 | err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr); |
| 54 | err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr); |
| 55 | current_thread_info()->fpsaved[0] |= fprs; |
| 56 | return err; |
| 57 | } |
| 58 | |
| 59 | int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin) |
| 60 | { |
| 61 | int i, err = __put_user(wsaved, &rwin->wsaved); |
| 62 | |
| 63 | for (i = 0; i < wsaved; i++) { |
| 64 | struct reg_window *rp = ¤t_thread_info()->reg_window[i]; |
| 65 | unsigned long fp = current_thread_info()->rwbuf_stkptrs[i]; |
| 66 | |
| 67 | err |= copy_to_user(&rwin->reg_window[i], rp, |
| 68 | sizeof(struct reg_window)); |
| 69 | err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]); |
| 70 | } |
| 71 | return err; |
| 72 | } |
| 73 | |
| 74 | int restore_rwin_state(__siginfo_rwin_t __user *rp) |
| 75 | { |
| 76 | struct thread_info *t = current_thread_info(); |
| 77 | int i, wsaved, err; |
| 78 | |
| 79 | if (((unsigned long) rp) & 7) |
| 80 | return -EFAULT; |
| 81 | |
| 82 | get_user(wsaved, &rp->wsaved); |
| 83 | if (wsaved > NSWINS) |
| 84 | return -EFAULT; |
| 85 | |
| 86 | err = 0; |
| 87 | for (i = 0; i < wsaved; i++) { |
| 88 | err |= copy_from_user(&t->reg_window[i], |
| 89 | &rp->reg_window[i], |
| 90 | sizeof(struct reg_window)); |
| 91 | err |= __get_user(t->rwbuf_stkptrs[i], |
| 92 | &rp->rwbuf_stkptrs[i]); |
| 93 | } |
| 94 | if (err) |
| 95 | return err; |
| 96 | |
| 97 | set_thread_wsaved(wsaved); |
| 98 | synchronize_user_stack(); |
| 99 | if (get_thread_wsaved()) |
| 100 | return -EFAULT; |
| 101 | return 0; |
| 102 | } |