[linux-2.6-block.git] / arch / nds32 / kernel / ptrace.c

// 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);

}
Commit	Line	Data
e9d0704a GH	1	// SPDX-License-Identifier: GPL-2.0
	2	// Copyright (C) 2005-2017 Andes Technology Corporation
	3
	4	#include <linux/ptrace.h>
	5	#include <linux/regset.h>
	6	#include <linux/tracehook.h>
	7	#include <linux/elf.h>
	8	#include <linux/sched/task_stack.h>
	9
	10	enum nds32_regset {
	11	REGSET_GPR,
	12	};
	13
	14	static int gpr_get(struct task_struct *target,
	15	const struct user_regset *regset,
	16	unsigned int pos, unsigned int count,
	17	void kbuf, void __user ubuf)
	18	{
	19	struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
	20	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
	21	}
	22
	23	static int gpr_set(struct task_struct target, const struct user_regset regset,
	24	unsigned int pos, unsigned int count,
	25	const void kbuf, const void __user ubuf)
	26	{
	27	int err;
	28	struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
	29
	30	err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
	31	if (err)
	32	return err;
	33
	34	task_pt_regs(target)->user_regs = newregs;
	35	return 0;
	36	}
	37
	38	static const struct user_regset nds32_regsets[] = {
	39	[REGSET_GPR] = {
	40	.core_note_type = NT_PRSTATUS,
	41	.n = sizeof(struct user_pt_regs) / sizeof(u32),
	42	.size = sizeof(elf_greg_t),
	43	.align = sizeof(elf_greg_t),
	44	.get = gpr_get,
	45	.set = gpr_set}
	46	};
	47
	48	static const struct user_regset_view nds32_user_view = {
	49	.name = "nds32",
	50	.e_machine = EM_NDS32,
	51	.regsets = nds32_regsets,
	52	.n = ARRAY_SIZE(nds32_regsets)
	53	};
	54
	55	const struct user_regset_view task_user_regset_view(struct task_struct task)
	56	{
	57	return &nds32_user_view;
	58	}
	59
	60	void ptrace_disable(struct task_struct *child)
	61	{
	62	user_disable_single_step(child);
	63	}
	64
65	/* do_ptrace()
66	*
67	* Provide ptrace defined service.
68	*/
69	long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
70	unsigned long data)
71	{
72	int ret = -EIO;
73
74	switch (request) {
75	default:
76	ret = ptrace_request(child, request, addr, data);
77	break;
78	}
79
80	return ret;
81	}
82
83	void user_enable_single_step(struct task_struct *child)
84	{
85	struct pt_regs *regs;
86	regs = task_pt_regs(child);
87	regs->ipsw \|= PSW_mskHSS;
88	set_tsk_thread_flag(child, TIF_SINGLESTEP);
89	}
90
91	void user_disable_single_step(struct task_struct *child)
92	{
93	struct pt_regs *regs;
94	regs = task_pt_regs(child);
95	regs->ipsw &= ~PSW_mskHSS;
96	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
97	}
98
99	/* sys_trace()
100	*
101	* syscall trace handler.
102	*/
103
104	asmlinkage int syscall_trace_enter(struct pt_regs *regs)
105	{
106	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
107	if (tracehook_report_syscall_entry(regs))
108	forget_syscall(regs);
109	}
110	return regs->syscallno;
111	}
112
113	asmlinkage void syscall_trace_leave(struct pt_regs *regs)
114	{
115	int step = test_thread_flag(TIF_SINGLESTEP);
116	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
117	tracehook_report_syscall_exit(regs, step);
118
119	}