1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2005-2017 Andes Technology Corporation
4 #include <linux/ptrace.h>
5 #include <linux/regset.h>
6 #include <linux/tracehook.h>
8 #include <linux/sched/task_stack.h>
14 static int gpr_get(struct task_struct *target,
15 const struct user_regset *regset,
18 return membuf_write(&to, &task_pt_regs(target)->user_regs,
19 sizeof(struct user_pt_regs));
22 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
23 unsigned int pos, unsigned int count,
24 const void *kbuf, const void __user * ubuf)
27 struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
29 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
33 task_pt_regs(target)->user_regs = newregs;
37 static const struct user_regset nds32_regsets[] = {
39 .core_note_type = NT_PRSTATUS,
40 .n = sizeof(struct user_pt_regs) / sizeof(u32),
41 .size = sizeof(elf_greg_t),
42 .align = sizeof(elf_greg_t),
43 .regset_get = gpr_get,
47 static const struct user_regset_view nds32_user_view = {
49 .e_machine = EM_NDS32,
50 .regsets = nds32_regsets,
51 .n = ARRAY_SIZE(nds32_regsets)
54 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
56 return &nds32_user_view;
59 void ptrace_disable(struct task_struct *child)
61 user_disable_single_step(child);
66 * Provide ptrace defined service.
68 long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
75 ret = ptrace_request(child, request, addr, data);
82 void user_enable_single_step(struct task_struct *child)
85 regs = task_pt_regs(child);
86 regs->ipsw |= PSW_mskHSS;
87 set_tsk_thread_flag(child, TIF_SINGLESTEP);
90 void user_disable_single_step(struct task_struct *child)
93 regs = task_pt_regs(child);
94 regs->ipsw &= ~PSW_mskHSS;
95 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
100 * syscall trace handler.
103 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
105 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
106 if (tracehook_report_syscall_entry(regs))
107 forget_syscall(regs);
109 return regs->syscallno;
112 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
114 int step = test_thread_flag(TIF_SINGLESTEP);
115 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
116 tracehook_report_syscall_exit(regs, step);