1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * OpenRISC ptrace.c
  4 *
  5 * Linux architectural port borrowing liberally from similar works of
  6 * others.  All original copyrights apply as per the original source
  7 * declaration.
  8 *
  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>
 13 */
 14
 15#include <linux/kernel.h>
 16#include <linux/sched.h>
 17#include <linux/sched/task_stack.h>
 18#include <linux/string.h>
 19
 20#include <linux/mm.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>
 26
 27#include <asm/thread_info.h>
 28#include <asm/page.h>
 29
 
 
 
 
 30/*
 31 * Copy the thread state to a regset that can be interpreted by userspace.
 32 *
 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:
 37 *
 38 * (Each item is a 32-bit word)
 39 * r0 = 0 (exported for clarity)
 40 * 31 GPRS r1-r31
 41 * PC (Program counter)
 42 * SR (Supervision register)
 43 */
 44static int genregs_get(struct task_struct *target,
 45		       const struct user_regset *regset,
 46		       struct membuf to)
 47{
 48	const struct pt_regs *regs = task_pt_regs(target);
 49
 50	/* r0 */
 51	membuf_zero(&to, 4);
 52	membuf_write(&to, regs->gpr + 1, 31 * 4);
 53	membuf_store(&to, regs->pc);
 54	return membuf_store(&to, regs->sr);
 55}
 56
 57/*
 58 * Set the thread state from a regset passed in via ptrace
 59 */
 60static 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)
 64{
 65	struct pt_regs *regs = task_pt_regs(target);
 66	int ret;
 67
 68	/* ignore r0 */
 69	user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
 70	/* r1 - r31 */
 71	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 72					 regs->gpr+1, 4, 4*32);
 73	/* PC */
 74	if (!ret)
 75		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 76				 &regs->pc, 4*32, 4*33);
 77	/*
 78	 * Skip SR and padding... userspace isn't allowed to changes bits in
 79	 * the Supervision register
 80	 */
 81	if (!ret)
 82		user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 4*33, -1);
 83
 84	return ret;
 85}
 86
 87/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 88 * Define the register sets available on OpenRISC under Linux
 89 */
 90enum or1k_regset {
 91	REGSET_GENERAL,
 
 92};
 93
 94static const struct user_regset or1k_regsets[] = {
 95	[REGSET_GENERAL] = {
 96			    .core_note_type = NT_PRSTATUS,
 97			    .n = ELF_NGREG,
 98			    .size = sizeof(long),
 99			    .align = sizeof(long),
100			    .regset_get = genregs_get,
101			    .set = genregs_set,
 
 
 
 
 
 
 
 
102			    },
103};
104
105static const struct user_regset_view user_or1k_native_view = {
106	.name = "or1k",
107	.e_machine = EM_OPENRISC,
108	.regsets = or1k_regsets,
109	.n = ARRAY_SIZE(or1k_regsets),
110};
111
112const struct user_regset_view *task_user_regset_view(struct task_struct *task)
113{
114	return &user_or1k_native_view;
115}
116
117/*
118 * does not yet catch signals sent when the child dies.
119 * in exit.c or in signal.c.
120 */
121
122
123/*
124 * Called by kernel/ptrace.c when detaching..
125 *
126 * Make sure the single step bit is not set.
127 */
128void ptrace_disable(struct task_struct *child)
129{
130	pr_debug("ptrace_disable(): TODO\n");
131
132	user_disable_single_step(child);
133	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
134}
135
136long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
137		 unsigned long data)
138{
139	int ret;
140
141	switch (request) {
142	default:
143		ret = ptrace_request(child, request, addr, data);
144		break;
145	}
146
147	return ret;
148}
149
150/*
151 * Notification of system call entry/exit
152 * - triggered by current->work.syscall_trace
153 */
154asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
155{
156	long ret = 0;
157
158	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
159	    ptrace_report_syscall_entry(regs))
160		/*
161		 * Tracing decided this syscall should not happen.
162		 * We'll return a bogus call number to get an ENOSYS
163		 * error, but leave the original number in <something>.
164		 */
165		ret = -1L;
166
167	audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
168			    regs->gpr[5], regs->gpr[6]);
169
170	return ret ? : regs->gpr[11];
171}
172
173asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
174{
175	int step;
176
177	audit_syscall_exit(regs);
178
179	step = test_thread_flag(TIF_SINGLESTEP);
180	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
181		ptrace_report_syscall_exit(regs, step);
182}

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * OpenRISC ptrace.c
  4 *
  5 * Linux architectural port borrowing liberally from similar works of
  6 * others.  All original copyrights apply as per the original source
  7 * declaration.
  8 *
  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>
 13 */
 14
 15#include <linux/kernel.h>
 16#include <linux/sched.h>
 17#include <linux/sched/task_stack.h>
 18#include <linux/string.h>
 19
 20#include <linux/mm.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>
 26
 27#include <asm/thread_info.h>
 28#include <asm/page.h>
 29
 30asmlinkage long do_syscall_trace_enter(struct pt_regs *regs);
 31
 32asmlinkage void do_syscall_trace_leave(struct pt_regs *regs);
 33
 34/*
 35 * Copy the thread state to a regset that can be interpreted by userspace.
 36 *
 37 * It doesn't matter what our internal pt_regs structure looks like.  The
 38 * important thing is that we export a consistent view of the thread state
 39 * to userspace.  As such, we need to make sure that the regset remains
 40 * ABI compatible as defined by the struct user_regs_struct:
 41 *
 42 * (Each item is a 32-bit word)
 43 * r0 = 0 (exported for clarity)
 44 * 31 GPRS r1-r31
 45 * PC (Program counter)
 46 * SR (Supervision register)
 47 */
 48static int genregs_get(struct task_struct *target,
 49		       const struct user_regset *regset,
 50		       struct membuf to)
 51{
 52	const struct pt_regs *regs = task_pt_regs(target);
 53
 54	/* r0 */
 55	membuf_zero(&to, 4);
 56	membuf_write(&to, regs->gpr + 1, 31 * 4);
 57	membuf_store(&to, regs->pc);
 58	return membuf_store(&to, regs->sr);
 59}
 60
 61/*
 62 * Set the thread state from a regset passed in via ptrace
 63 */
 64static int genregs_set(struct task_struct *target,
 65		       const struct user_regset *regset,
 66		       unsigned int pos, unsigned int count,
 67		       const void *kbuf, const void __user * ubuf)
 68{
 69	struct pt_regs *regs = task_pt_regs(target);
 70	int ret;
 71
 72	/* ignore r0 */
 73	user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
 74	/* r1 - r31 */
 75	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 76					 regs->gpr+1, 4, 4*32);
 77	/* PC */
 78	if (!ret)
 79		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 80				 &regs->pc, 4*32, 4*33);
 81	/*
 82	 * Skip SR and padding... userspace isn't allowed to changes bits in
 83	 * the Supervision register
 84	 */
 85	if (!ret)
 86		user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 4*33, -1);
 87
 88	return ret;
 89}
 90
 91/*
 92 * As OpenRISC shares GPRs and floating point registers we don't need to export
 93 * the floating point registers again.  So here we only export the fpcsr special
 94 * purpose register.
 95 */
 96static int fpregs_get(struct task_struct *target,
 97		       const struct user_regset *regset,
 98		       struct membuf to)
 99{
100	const struct pt_regs *regs = task_pt_regs(target);
101
102	return membuf_store(&to, regs->fpcsr);
103}
104
105static int fpregs_set(struct task_struct *target,
106		       const struct user_regset *regset,
107		       unsigned int pos, unsigned int count,
108		       const void *kbuf, const void __user *ubuf)
109{
110	struct pt_regs *regs = task_pt_regs(target);
111	int ret;
112
113	/* FPCSR */
114	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
115				 &regs->fpcsr, 0, 4);
116	return ret;
117}
118
119/*
120 * Define the register sets available on OpenRISC under Linux
121 */
122enum or1k_regset {
123	REGSET_GENERAL,
124	REGSET_FPU,
125};
126
127static const struct user_regset or1k_regsets[] = {
128	[REGSET_GENERAL] = {
129			    .core_note_type = NT_PRSTATUS,
130			    .n = ELF_NGREG,
131			    .size = sizeof(long),
132			    .align = sizeof(long),
133			    .regset_get = genregs_get,
134			    .set = genregs_set,
135			    },
136	[REGSET_FPU] = {
137			    .core_note_type = NT_PRFPREG,
138			    .n = sizeof(struct __or1k_fpu_state) / sizeof(long),
139			    .size = sizeof(long),
140			    .align = sizeof(long),
141			    .regset_get = fpregs_get,
142			    .set = fpregs_set,
143			    },
144};
145
146static const struct user_regset_view user_or1k_native_view = {
147	.name = "or1k",
148	.e_machine = EM_OPENRISC,
149	.regsets = or1k_regsets,
150	.n = ARRAY_SIZE(or1k_regsets),
151};
152
153const struct user_regset_view *task_user_regset_view(struct task_struct *task)
154{
155	return &user_or1k_native_view;
156}
157
158/*
159 * does not yet catch signals sent when the child dies.
160 * in exit.c or in signal.c.
161 */
162
163
164/*
165 * Called by kernel/ptrace.c when detaching..
166 *
167 * Make sure the single step bit is not set.
168 */
169void ptrace_disable(struct task_struct *child)
170{
171	pr_debug("ptrace_disable(): TODO\n");
172
173	user_disable_single_step(child);
174	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
175}
176
177long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
178		 unsigned long data)
179{
180	int ret;
181
182	switch (request) {
183	default:
184		ret = ptrace_request(child, request, addr, data);
185		break;
186	}
187
188	return ret;
189}
190
191/*
192 * Notification of system call entry/exit
193 * - triggered by current->work.syscall_trace
194 */
195asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
196{
197	long ret = 0;
198
199	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
200	    ptrace_report_syscall_entry(regs))
201		/*
202		 * Tracing decided this syscall should not happen.
203		 * We'll return a bogus call number to get an ENOSYS
204		 * error, but leave the original number in <something>.
205		 */
206		ret = -1L;
207
208	audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
209			    regs->gpr[5], regs->gpr[6]);
210
211	return ret ? : regs->gpr[11];
212}
213
214asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
215{
216	int step;
217
218	audit_syscall_exit(regs);
219
220	step = test_thread_flag(TIF_SINGLESTEP);
221	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
222		ptrace_report_syscall_exit(regs, step);
223}