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/*
* Copyright (C) 2014 Altera Corporation
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*/
#include <linux/elf.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <linux/user.h>
static int genregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
const struct pt_regs *regs = task_pt_regs(target);
const struct switch_stack *sw = (struct switch_stack *)regs - 1;
membuf_zero(&to, 4); // R0
membuf_write(&to, ®s->r1, 7 * 4); // R1..R7
membuf_write(&to, ®s->r8, 8 * 4); // R8..R15
membuf_write(&to, sw, 8 * 4); // R16..R23
membuf_zero(&to, 2 * 4); /* et and bt */
membuf_store(&to, regs->gp);
membuf_store(&to, regs->sp);
membuf_store(&to, regs->fp);
membuf_store(&to, regs->ea);
membuf_zero(&to, 4); // PTR_BA
membuf_store(&to, regs->ra);
membuf_store(&to, regs->ea); /* use ea for PC */
return membuf_zero(&to, (NUM_PTRACE_REG - PTR_PC) * 4);
}
/*
* Set the thread state from a regset passed in via ptrace
*/
static int genregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = task_pt_regs(target);
const struct switch_stack *sw = (struct switch_stack *)regs - 1;
int ret = 0;
#define REG_IGNORE_RANGE(START, END) \
if (!ret) \
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
START * 4, (END * 4) + 4);
#define REG_IN_ONE(PTR, LOC) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), LOC * 4, (LOC * 4) + 4);
#define REG_IN_RANGE(PTR, START, END) \
if (!ret) \
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
(void *)(PTR), START * 4, (END * 4) + 4);
REG_IGNORE_RANGE(PTR_R0, PTR_R0);
REG_IN_RANGE(®s->r1, PTR_R1, PTR_R7);
REG_IN_RANGE(®s->r8, PTR_R8, PTR_R15);
REG_IN_RANGE(sw, PTR_R16, PTR_R23);
REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */
REG_IN_ONE(®s->gp, PTR_GP);
REG_IN_ONE(®s->sp, PTR_SP);
REG_IN_ONE(®s->fp, PTR_FP);
REG_IN_ONE(®s->ea, PTR_EA);
REG_IGNORE_RANGE(PTR_BA, PTR_BA);
REG_IN_ONE(®s->ra, PTR_RA);
REG_IN_ONE(®s->ea, PTR_PC); /* use ea for PC */
if (!ret)
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
PTR_STATUS * 4, -1);
return ret;
}
/*
* Define the register sets available on Nios2 under Linux
*/
enum nios2_regset {
REGSET_GENERAL,
};
static const struct user_regset nios2_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = NUM_PTRACE_REG,
.size = sizeof(unsigned long),
.align = sizeof(unsigned long),
.regset_get = genregs_get,
.set = genregs_set,
}
};
static const struct user_regset_view nios2_user_view = {
.name = "nios2",
.e_machine = ELF_ARCH,
.ei_osabi = ELF_OSABI,
.regsets = nios2_regsets,
.n = ARRAY_SIZE(nios2_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &nios2_user_view;
}
void ptrace_disable(struct task_struct *child)
{
}
long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
unsigned long data)
{
return ptrace_request(child, request, addr, data);
}
asmlinkage int do_syscall_trace_enter(void)
{
int ret = 0;
if (test_thread_flag(TIF_SYSCALL_TRACE))
ret = tracehook_report_syscall_entry(task_pt_regs(current));
return ret;
}
asmlinkage void do_syscall_trace_exit(void)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(task_pt_regs(current), 0);
}
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