1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
12 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
15 #include <linux/kernel.h>
16 #include <linux/sched.h>
17 #include <linux/sched/task_stack.h>
18 #include <linux/string.h>
21 #include <linux/errno.h>
22 #include <linux/ptrace.h>
23 #include <linux/audit.h>
24 #include <linux/regset.h>
25 #include <linux/tracehook.h>
26 #include <linux/elf.h>
28 #include <asm/thread_info.h>
32 * Copy the thread state to a regset that can be interpreted by userspace.
34 * It doesn't matter what our internal pt_regs structure looks like. The
35 * important thing is that we export a consistent view of the thread state
36 * to userspace. As such, we need to make sure that the regset remains
37 * ABI compatible as defined by the struct user_regs_struct:
39 * (Each item is a 32-bit word)
40 * r0 = 0 (exported for clarity)
42 * PC (Program counter)
43 * SR (Supervision register)
45 static int genregs_get(struct task_struct *target,
46 const struct user_regset *regset,
47 unsigned int pos, unsigned int count,
48 void *kbuf, void __user * ubuf)
50 const struct pt_regs *regs = task_pt_regs(target);
54 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4);
57 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
58 regs->gpr+1, 4, 4*32);
60 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
61 ®s->pc, 4*32, 4*33);
63 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
64 ®s->sr, 4*33, 4*34);
66 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
73 * Set the thread state from a regset passed in via ptrace
75 static int genregs_set(struct task_struct *target,
76 const struct user_regset *regset,
77 unsigned int pos, unsigned int count,
78 const void *kbuf, const void __user * ubuf)
80 struct pt_regs *regs = task_pt_regs(target);
84 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
87 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
88 regs->gpr+1, 4, 4*32);
91 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
92 ®s->pc, 4*32, 4*33);
94 * Skip SR and padding... userspace isn't allowed to changes bits in
95 * the Supervision register
98 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
105 * Define the register sets available on OpenRISC under Linux
111 static const struct user_regset or1k_regsets[] = {
113 .core_note_type = NT_PRSTATUS,
115 .size = sizeof(long),
116 .align = sizeof(long),
122 static const struct user_regset_view user_or1k_native_view = {
124 .e_machine = EM_OPENRISC,
125 .regsets = or1k_regsets,
126 .n = ARRAY_SIZE(or1k_regsets),
129 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
131 return &user_or1k_native_view;
135 * does not yet catch signals sent when the child dies.
136 * in exit.c or in signal.c.
141 * Called by kernel/ptrace.c when detaching..
143 * Make sure the single step bit is not set.
145 void ptrace_disable(struct task_struct *child)
147 pr_debug("ptrace_disable(): TODO\n");
149 user_disable_single_step(child);
150 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
153 long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
160 ret = ptrace_request(child, request, addr, data);
168 * Notification of system call entry/exit
169 * - triggered by current->work.syscall_trace
171 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
175 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
176 tracehook_report_syscall_entry(regs))
178 * Tracing decided this syscall should not happen.
179 * We'll return a bogus call number to get an ENOSYS
180 * error, but leave the original number in <something>.
184 audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
185 regs->gpr[5], regs->gpr[6]);
187 return ret ? : regs->gpr[11];
190 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
194 audit_syscall_exit(regs);
196 step = test_thread_flag(TIF_SINGLESTEP);
197 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
198 tracehook_report_syscall_exit(regs, step);