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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
10enum nds32_regset {
11 REGSET_GPR,
12};
13
14static 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
23static 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
38static 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
48static 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
55const struct user_regset_view *task_user_regset_view(struct task_struct *task)
56{
57 return &nds32_user_view;
58}
59
60void 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 */
69long 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
83void 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
91void 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
104asmlinkage 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
113asmlinkage 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}
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
10enum nds32_regset {
11 REGSET_GPR,
12};
13
14static 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
23static 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
38static 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
48static 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
55const struct user_regset_view *task_user_regset_view(struct task_struct *task)
56{
57 return &nds32_user_view;
58}
59
60void 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 */
69long 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
83void 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
91void 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
104asmlinkage 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
113asmlinkage 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}