1/*
  2 * OpenRISC ptrace.c
  3 *
  4 * Linux architectural port borrowing liberally from similar works of
  5 * others.  All original copyrights apply as per the original source
  6 * declaration.
  7 *
  8 * Modifications for the OpenRISC architecture:
  9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 10 * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
 11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 12 *
 13 *      This program is free software; you can redistribute it and/or
 14 *      modify it under the terms of the GNU General Public License
 15 *      as published by the Free Software Foundation; either version
 16 *      2 of the License, or (at your option) any later version.
 17 */
 18
 19#include <stddef.h>
 20#include <linux/kernel.h>
 21#include <linux/sched.h>
 
 22#include <linux/string.h>
 23
 24#include <linux/mm.h>
 25#include <linux/errno.h>
 26#include <linux/ptrace.h>
 27#include <linux/audit.h>
 28#include <linux/regset.h>
 29#include <linux/tracehook.h>
 30#include <linux/elf.h>
 31
 32#include <asm/thread_info.h>
 33#include <asm/segment.h>
 34#include <asm/page.h>
 35#include <asm/pgtable.h>
 36#include <asm/system.h>
 37
 38/*
 39 * Copy the thread state to a regset that can be interpreted by userspace.
 40 *
 41 * It doesn't matter what our internal pt_regs structure looks like.  The
 42 * important thing is that we export a consistent view of the thread state
 43 * to userspace.  As such, we need to make sure that the regset remains
 44 * ABI compatible as defined by the struct user_regs_struct:
 45 *
 46 * (Each item is a 32-bit word)
 47 * r0 = 0 (exported for clarity)
 48 * 31 GPRS r1-r31
 49 * PC (Program counter)
 50 * SR (Supervision register)
 51 */
 52static int genregs_get(struct task_struct *target,
 53		       const struct user_regset *regset,
 54		       unsigned int pos, unsigned int count,
 55		       void *kbuf, void __user * ubuf)
 56{
 57	const struct pt_regs *regs = task_pt_regs(target);
 58	int ret;
 59
 60	/* r0 */
 61	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4);
 62
 63	if (!ret)
 64		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 65					  regs->gpr+1, 4, 4*32);
 66	if (!ret)
 67		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 68				  &regs->pc, 4*32, 4*33);
 69	if (!ret)
 70		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 71					  &regs->sr, 4*33, 4*34);
 72	if (!ret)
 73		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 74					       4*34, -1);
 75
 76	return ret;
 77}
 78
 79/*
 80 * Set the thread state from a regset passed in via ptrace
 81 */
 82static int genregs_set(struct task_struct *target,
 83		       const struct user_regset *regset,
 84		       unsigned int pos, unsigned int count,
 85		       const void *kbuf, const void __user * ubuf)
 86{
 87	struct pt_regs *regs = task_pt_regs(target);
 88	int ret;
 89
 90	/* ignore r0 */
 91	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
 92	/* r1 - r31 */
 93	if (!ret)
 94		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 95					 regs->gpr+1, 4, 4*32);
 96	/* PC */
 97	if (!ret)
 98		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 99				 &regs->pc, 4*32, 4*33);
100	/*
101	 * Skip SR and padding... userspace isn't allowed to changes bits in
102	 * the Supervision register
103	 */
104	if (!ret)
105		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
106						4*33, -1);
107
108	return ret;
109}
110
111/*
112 * Define the register sets available on OpenRISC under Linux
113 */
114enum or1k_regset {
115	REGSET_GENERAL,
116};
117
118static const struct user_regset or1k_regsets[] = {
119	[REGSET_GENERAL] = {
120			    .core_note_type = NT_PRSTATUS,
121			    .n = ELF_NGREG,
122			    .size = sizeof(long),
123			    .align = sizeof(long),
124			    .get = genregs_get,
125			    .set = genregs_set,
126			    },
127};
128
129static const struct user_regset_view user_or1k_native_view = {
130	.name = "or1k",
131	.e_machine = EM_OPENRISC,
132	.regsets = or1k_regsets,
133	.n = ARRAY_SIZE(or1k_regsets),
134};
135
136const struct user_regset_view *task_user_regset_view(struct task_struct *task)
137{
138	return &user_or1k_native_view;
139}
140
141/*
142 * does not yet catch signals sent when the child dies.
143 * in exit.c or in signal.c.
144 */
145
146
147/*
148 * Called by kernel/ptrace.c when detaching..
149 *
150 * Make sure the single step bit is not set.
151 */
152void ptrace_disable(struct task_struct *child)
153{
154	pr_debug("ptrace_disable(): TODO\n");
155
156	user_disable_single_step(child);
157	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
158}
159
160long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
161		 unsigned long data)
162{
163	int ret;
164
165	switch (request) {
166	default:
167		ret = ptrace_request(child, request, addr, data);
168		break;
169	}
170
171	return ret;
172}
173
174/*
175 * Notification of system call entry/exit
176 * - triggered by current->work.syscall_trace
177 */
178asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
179{
180	long ret = 0;
181
182	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
183	    tracehook_report_syscall_entry(regs))
184		/*
185		 * Tracing decided this syscall should not happen.
186		 * We'll return a bogus call number to get an ENOSYS
187		 * error, but leave the original number in <something>.
188		 */
189		ret = -1L;
190
191	/* Are these regs right??? */
192	if (unlikely(current->audit_context))
193		audit_syscall_entry(audit_arch(), regs->syscallno,
194				    regs->gpr[3], regs->gpr[4],
195				    regs->gpr[5], regs->gpr[6]);
196
197	return ret ? : regs->syscallno;
198}
199
200asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
201{
202	int step;
203
204	if (unlikely(current->audit_context))
205		audit_syscall_exit(AUDITSC_RESULT(regs->gpr[11]),
206				   regs->gpr[11]);
207
208	step = test_thread_flag(TIF_SINGLESTEP);
209	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
210		tracehook_report_syscall_exit(regs, step);
211}

  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/tracehook.h>
 26#include <linux/elf.h>
 27
 28#include <asm/thread_info.h>
 
 29#include <asm/page.h>
 
 
 30
 31/*
 32 * Copy the thread state to a regset that can be interpreted by userspace.
 33 *
 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:
 38 *
 39 * (Each item is a 32-bit word)
 40 * r0 = 0 (exported for clarity)
 41 * 31 GPRS r1-r31
 42 * PC (Program counter)
 43 * SR (Supervision register)
 44 */
 45static int genregs_get(struct task_struct *target,
 46		       const struct user_regset *regset,
 47		       struct membuf to)
 
 48{
 49	const struct pt_regs *regs = task_pt_regs(target);
 
 50
 51	/* r0 */
 52	membuf_zero(&to, 4);
 53	membuf_write(&to, regs->gpr + 1, 31 * 4);
 54	membuf_store(&to, regs->pc);
 55	return membuf_store(&to, regs->sr);
 
 
 
 
 
 
 
 
 
 
 
 
 56}
 57
 58/*
 59 * Set the thread state from a regset passed in via ptrace
 60 */
 61static int genregs_set(struct task_struct *target,
 62		       const struct user_regset *regset,
 63		       unsigned int pos, unsigned int count,
 64		       const void *kbuf, const void __user * ubuf)
 65{
 66	struct pt_regs *regs = task_pt_regs(target);
 67	int ret;
 68
 69	/* ignore r0 */
 70	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
 71	/* r1 - r31 */
 72	if (!ret)
 73		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 74					 regs->gpr+1, 4, 4*32);
 75	/* PC */
 76	if (!ret)
 77		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 78				 &regs->pc, 4*32, 4*33);
 79	/*
 80	 * Skip SR and padding... userspace isn't allowed to changes bits in
 81	 * the Supervision register
 82	 */
 83	if (!ret)
 84		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 85						4*33, -1);
 86
 87	return ret;
 88}
 89
 90/*
 91 * Define the register sets available on OpenRISC under Linux
 92 */
 93enum or1k_regset {
 94	REGSET_GENERAL,
 95};
 96
 97static const struct user_regset or1k_regsets[] = {
 98	[REGSET_GENERAL] = {
 99			    .core_note_type = NT_PRSTATUS,
100			    .n = ELF_NGREG,
101			    .size = sizeof(long),
102			    .align = sizeof(long),
103			    .regset_get = genregs_get,
104			    .set = genregs_set,
105			    },
106};
107
108static const struct user_regset_view user_or1k_native_view = {
109	.name = "or1k",
110	.e_machine = EM_OPENRISC,
111	.regsets = or1k_regsets,
112	.n = ARRAY_SIZE(or1k_regsets),
113};
114
115const struct user_regset_view *task_user_regset_view(struct task_struct *task)
116{
117	return &user_or1k_native_view;
118}
119
120/*
121 * does not yet catch signals sent when the child dies.
122 * in exit.c or in signal.c.
123 */
124
125
126/*
127 * Called by kernel/ptrace.c when detaching..
128 *
129 * Make sure the single step bit is not set.
130 */
131void ptrace_disable(struct task_struct *child)
132{
133	pr_debug("ptrace_disable(): TODO\n");
134
135	user_disable_single_step(child);
136	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
137}
138
139long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
140		 unsigned long data)
141{
142	int ret;
143
144	switch (request) {
145	default:
146		ret = ptrace_request(child, request, addr, data);
147		break;
148	}
149
150	return ret;
151}
152
153/*
154 * Notification of system call entry/exit
155 * - triggered by current->work.syscall_trace
156 */
157asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
158{
159	long ret = 0;
160
161	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
162	    tracehook_report_syscall_entry(regs))
163		/*
164		 * Tracing decided this syscall should not happen.
165		 * We'll return a bogus call number to get an ENOSYS
166		 * error, but leave the original number in <something>.
167		 */
168		ret = -1L;
169
170	audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
171			    regs->gpr[5], regs->gpr[6]);
 
 
 
172
173	return ret ? : regs->gpr[11];
174}
175
176asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
177{
178	int step;
179
180	audit_syscall_exit(regs);
 
 
181
182	step = test_thread_flag(TIF_SINGLESTEP);
183	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
184		tracehook_report_syscall_exit(regs, step);
185}