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/elf.h>
27 #include <asm/thread_info.h>
31 * Copy the thread state to a regset that can be interpreted by userspace.
33 * It doesn't matter what our internal pt_regs structure looks like. The
34 * important thing is that we export a consistent view of the thread state
35 * to userspace. As such, we need to make sure that the regset remains
36 * ABI compatible as defined by the struct user_regs_struct:
38 * (Each item is a 32-bit word)
39 * r0 = 0 (exported for clarity)
41 * PC (Program counter)
42 * SR (Supervision register)
44 static int genregs_get(struct task_struct *target,
45 const struct user_regset *regset,
48 const struct pt_regs *regs = task_pt_regs(target);
52 membuf_write(&to, regs->gpr + 1, 31 * 4);
53 membuf_store(&to, regs->pc);
54 return membuf_store(&to, regs->sr);
58 * Set the thread state from a regset passed in via ptrace
60 static int genregs_set(struct task_struct *target,
61 const struct user_regset *regset,
62 unsigned int pos, unsigned int count,
63 const void *kbuf, const void __user * ubuf)
65 struct pt_regs *regs = task_pt_regs(target);
69 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
71 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
72 regs->gpr+1, 4, 4*32);
75 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
76 ®s->pc, 4*32, 4*33);
78 * Skip SR and padding... userspace isn't allowed to changes bits in
79 * the Supervision register
82 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 4*33, -1);
88 * As OpenRISC shares GPRs and floating point registers we don't need to export
89 * the floating point registers again. So here we only export the fpcsr special
92 static int fpregs_get(struct task_struct *target,
93 const struct user_regset *regset,
96 const struct pt_regs *regs = task_pt_regs(target);
98 return membuf_store(&to, regs->fpcsr);
101 static int fpregs_set(struct task_struct *target,
102 const struct user_regset *regset,
103 unsigned int pos, unsigned int count,
104 const void *kbuf, const void __user *ubuf)
106 struct pt_regs *regs = task_pt_regs(target);
110 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
116 * Define the register sets available on OpenRISC under Linux
123 static const struct user_regset or1k_regsets[] = {
125 .core_note_type = NT_PRSTATUS,
127 .size = sizeof(long),
128 .align = sizeof(long),
129 .regset_get = genregs_get,
133 .core_note_type = NT_PRFPREG,
134 .n = sizeof(struct __or1k_fpu_state) / sizeof(long),
135 .size = sizeof(long),
136 .align = sizeof(long),
137 .regset_get = fpregs_get,
142 static const struct user_regset_view user_or1k_native_view = {
144 .e_machine = EM_OPENRISC,
145 .regsets = or1k_regsets,
146 .n = ARRAY_SIZE(or1k_regsets),
149 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
151 return &user_or1k_native_view;
155 * does not yet catch signals sent when the child dies.
156 * in exit.c or in signal.c.
161 * Called by kernel/ptrace.c when detaching..
163 * Make sure the single step bit is not set.
165 void ptrace_disable(struct task_struct *child)
167 pr_debug("ptrace_disable(): TODO\n");
169 user_disable_single_step(child);
170 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
173 long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
180 ret = ptrace_request(child, request, addr, data);
188 * Notification of system call entry/exit
189 * - triggered by current->work.syscall_trace
191 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
195 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
196 ptrace_report_syscall_entry(regs))
198 * Tracing decided this syscall should not happen.
199 * We'll return a bogus call number to get an ENOSYS
200 * error, but leave the original number in <something>.
204 audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
205 regs->gpr[5], regs->gpr[6]);
207 return ret ? : regs->gpr[11];
210 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
214 audit_syscall_exit(regs);
216 step = test_thread_flag(TIF_SINGLESTEP);
217 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
218 ptrace_report_syscall_exit(regs, step);