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
 15int 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(&current->thread.float_regs[0], &current->thread.fsr,
 22		       &current->thread.fpqueue[0], &current->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(&current->thread.float_regs[0], &current->thread.fsr,
 30		       &current->thread.fpqueue[0], &current->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			      &current->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				      &current->thread.fpqueue[0],
 43				      ((sizeof(unsigned long) +
 44				      (sizeof(unsigned long *)))*16));
 45	clear_used_math();
 46	return err;
 47}
 48
 49int 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(&current->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(&current->thread.fpqueue[0],
 77					&fpu->si_fpqueue[0],
 78					((sizeof(unsigned long) +
 79					(sizeof(unsigned long *)))*16));
 80	return err;
 81}
 82
 83int 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 = &current_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
100int 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}

  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
 15int 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(&current->thread.float_regs[0], &current->thread.fsr,
 22		       &current->thread.fpqueue[0], &current->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(&current->thread.float_regs[0], &current->thread.fsr,
 30		       &current->thread.fpqueue[0], &current->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			      &current->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				      &current->thread.fpqueue[0],
 43				      ((sizeof(unsigned long) +
 44				      (sizeof(unsigned long *)))*16));
 45	clear_used_math();
 46	return err;
 47}
 48
 49int 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(fpu, sizeof(*fpu)))
 69		return -EFAULT;
 70
 71	err = __copy_from_user(&current->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(&current->thread.fpqueue[0],
 77					&fpu->si_fpqueue[0],
 78					((sizeof(unsigned long) +
 79					(sizeof(unsigned long *)))*16));
 80	return err;
 81}
 82
 83int 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 = &current_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
100int 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}