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>
30 #include <asm/pgtable.h>
33 * Copy the thread state to a regset that can be interpreted by userspace.
35 * It doesn't matter what our internal pt_regs structure looks like. The
36 * important thing is that we export a consistent view of the thread state
37 * to userspace. As such, we need to make sure that the regset remains
38 * ABI compatible as defined by the struct user_regs_struct:
40 * (Each item is a 32-bit word)
41 * r0 = 0 (exported for clarity)
43 * PC (Program counter)
44 * SR (Supervision register)
46 static int genregs_get(struct task_struct *target,
47 const struct user_regset *regset,
48 unsigned int pos, unsigned int count,
49 void *kbuf, void __user * ubuf)
51 const struct pt_regs *regs = task_pt_regs(target);
55 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4);
58 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
59 regs->gpr+1, 4, 4*32);
61 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
62 ®s->pc, 4*32, 4*33);
64 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
65 ®s->sr, 4*33, 4*34);
67 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
74 * Set the thread state from a regset passed in via ptrace
76 static int genregs_set(struct task_struct *target,
77 const struct user_regset *regset,
78 unsigned int pos, unsigned int count,
79 const void *kbuf, const void __user * ubuf)
81 struct pt_regs *regs = task_pt_regs(target);
85 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
88 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
89 regs->gpr+1, 4, 4*32);
92 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
93 ®s->pc, 4*32, 4*33);
95 * Skip SR and padding... userspace isn't allowed to changes bits in
96 * the Supervision register
99 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
106 * Define the register sets available on OpenRISC under Linux
112 static const struct user_regset or1k_regsets[] = {
114 .core_note_type = NT_PRSTATUS,
116 .size = sizeof(long),
117 .align = sizeof(long),
123 static const struct user_regset_view user_or1k_native_view = {
125 .e_machine = EM_OPENRISC,
126 .regsets = or1k_regsets,
127 .n = ARRAY_SIZE(or1k_regsets),
130 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
132 return &user_or1k_native_view;
136 * does not yet catch signals sent when the child dies.
137 * in exit.c or in signal.c.
142 * Called by kernel/ptrace.c when detaching..
144 * Make sure the single step bit is not set.
146 void ptrace_disable(struct task_struct *child)
148 pr_debug("ptrace_disable(): TODO\n");
150 user_disable_single_step(child);
151 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
154 long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
161 ret = ptrace_request(child, request, addr, data);
169 * Notification of system call entry/exit
170 * - triggered by current->work.syscall_trace
172 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
176 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
177 tracehook_report_syscall_entry(regs))
179 * Tracing decided this syscall should not happen.
180 * We'll return a bogus call number to get an ENOSYS
181 * error, but leave the original number in <something>.
185 audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
186 regs->gpr[5], regs->gpr[6]);
188 return ret ? : regs->gpr[11];
191 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
195 audit_syscall_exit(regs);
197 step = test_thread_flag(TIF_SINGLESTEP);
198 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
199 tracehook_report_syscall_exit(regs, step);