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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ptrace-novsx.c (1611B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2
      3#include <linux/regset.h>
      4
      5#include <asm/switch_to.h>
      6
      7#include "ptrace-decl.h"
      8
      9/*
     10 * Regardless of transactions, 'fp_state' holds the current running
     11 * value of all FPR registers and 'ckfp_state' holds the last checkpointed
     12 * value of all FPR registers for the current transaction.
     13 *
     14 * Userspace interface buffer layout:
     15 *
     16 * struct data {
     17 *	u64	fpr[32];
     18 *	u64	fpscr;
     19 * };
     20 */
     21int fpr_get(struct task_struct *target, const struct user_regset *regset,
     22	    struct membuf to)
     23{
     24#ifdef CONFIG_PPC_FPU_REGS
     25	BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
     26		     offsetof(struct thread_fp_state, fpr[32]));
     27
     28	flush_fp_to_thread(target);
     29
     30	return membuf_write(&to, &target->thread.fp_state, 33 * sizeof(u64));
     31#else
     32	return membuf_write(&to, &empty_zero_page, 33 * sizeof(u64));
     33#endif
     34}
     35
     36/*
     37 * Regardless of transactions, 'fp_state' holds the current running
     38 * value of all FPR registers and 'ckfp_state' holds the last checkpointed
     39 * value of all FPR registers for the current transaction.
     40 *
     41 * Userspace interface buffer layout:
     42 *
     43 * struct data {
     44 *	u64	fpr[32];
     45 *	u64	fpscr;
     46 * };
     47 *
     48 */
     49int fpr_set(struct task_struct *target, const struct user_regset *regset,
     50	    unsigned int pos, unsigned int count,
     51	    const void *kbuf, const void __user *ubuf)
     52{
     53#ifdef CONFIG_PPC_FPU_REGS
     54	BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
     55		     offsetof(struct thread_fp_state, fpr[32]));
     56
     57	flush_fp_to_thread(target);
     58
     59	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
     60				  &target->thread.fp_state, 0, -1);
     61#else
     62	return 0;
     63#endif
     64}