nds32: Debugging support

// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef __UAPI_ASM_NDS32_PTRACE_H

#define __UAPI_ASM_NDS32_PTRACE_H

#ifndef __ASSEMBLY__

/*

 * User structures for general purpose register.

 */

struct user_pt_regs {

	long uregs[26];

	long fp;

	long gp;

	long lp;

	long sp;

	long ipc;

	long lb;

	long le;

	long lc;

	long syscallno;

};

#endif

#endif

// 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,

		   unsigned int pos, unsigned int count,

		   void *kbuf, void __user * ubuf)

{

	struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;

	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);

}

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),

			.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);

}