cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sigutil_32.c (3387B)

      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}