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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perf_regs.c (1434B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * This file is subject to the terms and conditions of the GNU General Public
      4 * License.  See the file "COPYING" in the main directory of this archive
      5 * for more details.
      6 *
      7 * Some parts derived from x86 version of this file.
      8 *
      9 * Copyright (C) 2013 Cavium, Inc.
     10 */
     11
     12#include <linux/perf_event.h>
     13
     14#include <asm/ptrace.h>
     15
     16#ifdef CONFIG_32BIT
     17u64 perf_reg_abi(struct task_struct *tsk)
     18{
     19	return PERF_SAMPLE_REGS_ABI_32;
     20}
     21#else /* Must be CONFIG_64BIT */
     22u64 perf_reg_abi(struct task_struct *tsk)
     23{
     24	if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
     25		return PERF_SAMPLE_REGS_ABI_32;
     26	else
     27		return PERF_SAMPLE_REGS_ABI_64;
     28}
     29#endif /* CONFIG_32BIT */
     30
     31int perf_reg_validate(u64 mask)
     32{
     33	if (!mask)
     34		return -EINVAL;
     35	if (mask & ~((1ull << PERF_REG_MIPS_MAX) - 1))
     36		return -EINVAL;
     37	return 0;
     38}
     39
     40u64 perf_reg_value(struct pt_regs *regs, int idx)
     41{
     42	long v;
     43
     44	switch (idx) {
     45	case PERF_REG_MIPS_PC:
     46		v = regs->cp0_epc;
     47		break;
     48	case PERF_REG_MIPS_R1 ... PERF_REG_MIPS_R25:
     49		v = regs->regs[idx - PERF_REG_MIPS_R1 + 1];
     50		break;
     51	case PERF_REG_MIPS_R28 ... PERF_REG_MIPS_R31:
     52		v = regs->regs[idx - PERF_REG_MIPS_R28 + 28];
     53		break;
     54
     55	default:
     56		WARN_ON_ONCE(1);
     57		return 0;
     58	}
     59
     60	return (s64)v; /* Sign extend if 32-bit. */
     61}
     62
     63void perf_get_regs_user(struct perf_regs *regs_user,
     64			struct pt_regs *regs)
     65{
     66	regs_user->regs = task_pt_regs(current);
     67	regs_user->abi = perf_reg_abi(current);
     68}