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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation
#include <linux/ptrace.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <linux/elf.h>
#include <linux/sched/task_stack.h>
enum nds32_regset {
REGSET_GPR,
};
static int gpr_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
return membuf_write(&to, &task_pt_regs(target)->user_regs,
sizeof(struct user_pt_regs));
}
static int gpr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user * ubuf)
{
int err;
struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
if (err)
return err;
task_pt_regs(target)->user_regs = newregs;
return 0;
}
static const struct user_regset nds32_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = sizeof(struct user_pt_regs) / sizeof(u32),
.size = sizeof(elf_greg_t),
.align = sizeof(elf_greg_t),
.regset_get = gpr_get,
.set = gpr_set}
};
static const struct user_regset_view nds32_user_view = {
.name = "nds32",
.e_machine = EM_NDS32,
.regsets = nds32_regsets,
.n = ARRAY_SIZE(nds32_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &nds32_user_view;
}
void ptrace_disable(struct task_struct *child)
{
user_disable_single_step(child);
}
/* do_ptrace()
*
* Provide ptrace defined service.
*/
long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
unsigned long data)
{
int ret = -EIO;
switch (request) {
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
void user_enable_single_step(struct task_struct *child)
{
struct pt_regs *regs;
regs = task_pt_regs(child);
regs->ipsw |= PSW_mskHSS;
set_tsk_thread_flag(child, TIF_SINGLESTEP);
}
void user_disable_single_step(struct task_struct *child)
{
struct pt_regs *regs;
regs = task_pt_regs(child);
regs->ipsw &= ~PSW_mskHSS;
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}
/* sys_trace()
*
* syscall trace handler.
*/
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE)) {
if (tracehook_report_syscall_entry(regs))
forget_syscall(regs);
}
return regs->syscallno;
}
asmlinkage void syscall_trace_leave(struct pt_regs *regs)
{
int step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, step);
}
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