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.c (3902B)

      1/*
      2 * Copyright (C) 2014 Altera Corporation
      3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
      4 *
      5 * This file is subject to the terms and conditions of the GNU General
      6 * Public License.  See the file COPYING in the main directory of this
      7 * archive for more details.
      8 */
      9
     10#include <linux/elf.h>
     11#include <linux/errno.h>
     12#include <linux/kernel.h>
     13#include <linux/mm.h>
     14#include <linux/ptrace.h>
     15#include <linux/regset.h>
     16#include <linux/sched.h>
     17#include <linux/sched/task_stack.h>
     18#include <linux/uaccess.h>
     19#include <linux/user.h>
     20
     21static int genregs_get(struct task_struct *target,
     22		       const struct user_regset *regset,
     23		       struct membuf to)
     24{
     25	const struct pt_regs *regs = task_pt_regs(target);
     26	const struct switch_stack *sw = (struct switch_stack *)regs - 1;
     27
     28	membuf_zero(&to, 4); // R0
     29	membuf_write(&to, &regs->r1, 7 * 4); // R1..R7
     30	membuf_write(&to, &regs->r8, 8 * 4); // R8..R15
     31	membuf_write(&to, sw, 8 * 4); // R16..R23
     32	membuf_zero(&to, 2 * 4); /* et and bt */
     33	membuf_store(&to, regs->gp);
     34	membuf_store(&to, regs->sp);
     35	membuf_store(&to, regs->fp);
     36	membuf_store(&to, regs->ea);
     37	membuf_zero(&to, 4); // PTR_BA
     38	membuf_store(&to, regs->ra);
     39	membuf_store(&to, regs->ea); /* use ea for PC */
     40	return membuf_zero(&to, (NUM_PTRACE_REG - PTR_PC) * 4);
     41}
     42
     43/*
     44 * Set the thread state from a regset passed in via ptrace
     45 */
     46static int genregs_set(struct task_struct *target,
     47		       const struct user_regset *regset,
     48		       unsigned int pos, unsigned int count,
     49		       const void *kbuf, const void __user *ubuf)
     50{
     51	struct pt_regs *regs = task_pt_regs(target);
     52	const struct switch_stack *sw = (struct switch_stack *)regs - 1;
     53	int ret = 0;
     54
     55#define REG_IGNORE_RANGE(START, END)		\
     56	if (!ret)					\
     57		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
     58			START * 4, (END * 4) + 4);
     59
     60#define REG_IN_ONE(PTR, LOC)	\
     61	if (!ret)			\
     62		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
     63			(void *)(PTR), LOC * 4, (LOC * 4) + 4);
     64
     65#define REG_IN_RANGE(PTR, START, END)	\
     66	if (!ret)				\
     67		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
     68			(void *)(PTR), START * 4, (END * 4) + 4);
     69
     70	REG_IGNORE_RANGE(PTR_R0, PTR_R0);
     71	REG_IN_RANGE(&regs->r1, PTR_R1, PTR_R7);
     72	REG_IN_RANGE(&regs->r8, PTR_R8, PTR_R15);
     73	REG_IN_RANGE(sw, PTR_R16, PTR_R23);
     74	REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */
     75	REG_IN_ONE(&regs->gp, PTR_GP);
     76	REG_IN_ONE(&regs->sp, PTR_SP);
     77	REG_IN_ONE(&regs->fp, PTR_FP);
     78	REG_IN_ONE(&regs->ea, PTR_EA);
     79	REG_IGNORE_RANGE(PTR_BA, PTR_BA);
     80	REG_IN_ONE(&regs->ra, PTR_RA);
     81	REG_IN_ONE(&regs->ea, PTR_PC); /* use ea for PC */
     82	if (!ret)
     83		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
     84					 PTR_STATUS * 4, -1);
     85
     86	return ret;
     87}
     88
     89/*
     90 * Define the register sets available on Nios2 under Linux
     91 */
     92enum nios2_regset {
     93	REGSET_GENERAL,
     94};
     95
     96static const struct user_regset nios2_regsets[] = {
     97	[REGSET_GENERAL] = {
     98		.core_note_type = NT_PRSTATUS,
     99		.n = NUM_PTRACE_REG,
    100		.size = sizeof(unsigned long),
    101		.align = sizeof(unsigned long),
    102		.regset_get = genregs_get,
    103		.set = genregs_set,
    104	}
    105};
    106
    107static const struct user_regset_view nios2_user_view = {
    108	.name = "nios2",
    109	.e_machine = ELF_ARCH,
    110	.ei_osabi = ELF_OSABI,
    111	.regsets = nios2_regsets,
    112	.n = ARRAY_SIZE(nios2_regsets)
    113};
    114
    115const struct user_regset_view *task_user_regset_view(struct task_struct *task)
    116{
    117	return &nios2_user_view;
    118}
    119
    120void ptrace_disable(struct task_struct *child)
    121{
    122
    123}
    124
    125long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
    126		 unsigned long data)
    127{
    128	return ptrace_request(child, request, addr, data);
    129}
    130
    131asmlinkage int do_syscall_trace_enter(void)
    132{
    133	int ret = 0;
    134
    135	if (test_thread_flag(TIF_SYSCALL_TRACE))
    136		ret = ptrace_report_syscall_entry(task_pt_regs(current));
    137
    138	return ret;
    139}
    140
    141asmlinkage void do_syscall_trace_exit(void)
    142{
    143	if (test_thread_flag(TIF_SYSCALL_TRACE))
    144		ptrace_report_syscall_exit(task_pt_regs(current), 0);
    145}