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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#include <linux/audit.h>
5#include <linux/elf.h>
6#include <linux/errno.h>
7#include <linux/kernel.h>
8#include <linux/mm.h>
9#include <linux/ptrace.h>
10#include <linux/regset.h>
11#include <linux/sched.h>
12#include <linux/sched/task_stack.h>
13#include <linux/signal.h>
14#include <linux/smp.h>
15#include <linux/tracehook.h>
16#include <linux/uaccess.h>
17#include <linux/user.h>
18
19#include <asm/thread_info.h>
20#include <asm/page.h>
21#include <asm/pgtable.h>
22#include <asm/processor.h>
23#include <asm/asm-offsets.h>
24
25#include <abi/regdef.h>
26
27#define CREATE_TRACE_POINTS
28#include <trace/events/syscalls.h>
29
30/* sets the trace bits. */
31#define TRACE_MODE_SI (1 << 14)
32#define TRACE_MODE_RUN 0
33#define TRACE_MODE_MASK ~(0x3 << 14)
34
35/*
36 * Make sure the single step bit is not set.
37 */
38static void singlestep_disable(struct task_struct *tsk)
39{
40 struct pt_regs *regs;
41
42 regs = task_pt_regs(tsk);
43 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;
44}
45
46static void singlestep_enable(struct task_struct *tsk)
47{
48 struct pt_regs *regs;
49
50 regs = task_pt_regs(tsk);
51 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;
52}
53
54/*
55 * Make sure the single step bit is set.
56 */
57void user_enable_single_step(struct task_struct *child)
58{
59 singlestep_enable(child);
60}
61
62void user_disable_single_step(struct task_struct *child)
63{
64 singlestep_disable(child);
65}
66
67enum csky_regset {
68 REGSET_GPR,
69 REGSET_FPR,
70};
71
72static int gpr_get(struct task_struct *target,
73 const struct user_regset *regset,
74 unsigned int pos, unsigned int count,
75 void *kbuf, void __user *ubuf)
76{
77 struct pt_regs *regs;
78
79 regs = task_pt_regs(target);
80
81 /* Abiv1 regs->tls is fake and we need sync here. */
82 regs->tls = task_thread_info(target)->tp_value;
83
84 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
85}
86
87static int gpr_set(struct task_struct *target,
88 const struct user_regset *regset,
89 unsigned int pos, unsigned int count,
90 const void *kbuf, const void __user *ubuf)
91{
92 int ret;
93 struct pt_regs regs;
94
95 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0, -1);
96 if (ret)
97 return ret;
98
99 regs.sr = task_pt_regs(target)->sr;
100#ifdef CONFIG_CPU_HAS_HILO
101 regs.dcsr = task_pt_regs(target)->dcsr;
102#endif
103 task_thread_info(target)->tp_value = regs.tls;
104
105 *task_pt_regs(target) = regs;
106
107 return 0;
108}
109
110static int fpr_get(struct task_struct *target,
111 const struct user_regset *regset,
112 unsigned int pos, unsigned int count,
113 void *kbuf, void __user *ubuf)
114{
115 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
116
117#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
118 int i;
119 struct user_fp tmp = *regs;
120
121 for (i = 0; i < 16; i++) {
122 tmp.vr[i*4] = regs->vr[i*2];
123 tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];
124 }
125
126 for (i = 0; i < 32; i++)
127 tmp.vr[64 + i] = regs->vr[32 + i];
128
129 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
130#else
131 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
132#endif
133}
134
135static int fpr_set(struct task_struct *target,
136 const struct user_regset *regset,
137 unsigned int pos, unsigned int count,
138 const void *kbuf, const void __user *ubuf)
139{
140 int ret;
141 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
142
143#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
144 int i;
145 struct user_fp tmp;
146
147 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
148
149 *regs = tmp;
150
151 for (i = 0; i < 16; i++) {
152 regs->vr[i*2] = tmp.vr[i*4];
153 regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];
154 }
155
156 for (i = 0; i < 32; i++)
157 regs->vr[32 + i] = tmp.vr[64 + i];
158#else
159 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
160#endif
161
162 return ret;
163}
164
165static const struct user_regset csky_regsets[] = {
166 [REGSET_GPR] = {
167 .core_note_type = NT_PRSTATUS,
168 .n = sizeof(struct pt_regs) / sizeof(u32),
169 .size = sizeof(u32),
170 .align = sizeof(u32),
171 .get = &gpr_get,
172 .set = &gpr_set,
173 },
174 [REGSET_FPR] = {
175 .core_note_type = NT_PRFPREG,
176 .n = sizeof(struct user_fp) / sizeof(u32),
177 .size = sizeof(u32),
178 .align = sizeof(u32),
179 .get = &fpr_get,
180 .set = &fpr_set,
181 },
182};
183
184static const struct user_regset_view user_csky_view = {
185 .name = "csky",
186 .e_machine = ELF_ARCH,
187 .regsets = csky_regsets,
188 .n = ARRAY_SIZE(csky_regsets),
189};
190
191const struct user_regset_view *task_user_regset_view(struct task_struct *task)
192{
193 return &user_csky_view;
194}
195
196void ptrace_disable(struct task_struct *child)
197{
198 singlestep_disable(child);
199}
200
201long arch_ptrace(struct task_struct *child, long request,
202 unsigned long addr, unsigned long data)
203{
204 long ret = -EIO;
205
206 switch (request) {
207 default:
208 ret = ptrace_request(child, request, addr, data);
209 break;
210 }
211
212 return ret;
213}
214
215asmlinkage void syscall_trace_enter(struct pt_regs *regs)
216{
217 if (test_thread_flag(TIF_SYSCALL_TRACE))
218 if (tracehook_report_syscall_entry(regs))
219 syscall_set_nr(current, regs, -1);
220
221 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
222 trace_sys_enter(regs, syscall_get_nr(current, regs));
223
224 audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
225}
226
227asmlinkage void syscall_trace_exit(struct pt_regs *regs)
228{
229 audit_syscall_exit(regs);
230
231 if (test_thread_flag(TIF_SYSCALL_TRACE))
232 tracehook_report_syscall_exit(regs, 0);
233
234 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
235 trace_sys_exit(regs, syscall_get_return_value(current, regs));
236}
237
238extern void show_stack(struct task_struct *task, unsigned long *stack);
239void show_regs(struct pt_regs *fp)
240{
241 unsigned long *sp;
242 unsigned char *tp;
243 int i;
244
245 pr_info("\nCURRENT PROCESS:\n\n");
246 pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
247
248 if (current->mm) {
249 pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
250 (int) current->mm->start_code,
251 (int) current->mm->end_code,
252 (int) current->mm->start_data,
253 (int) current->mm->end_data,
254 (int) current->mm->end_data,
255 (int) current->mm->brk);
256 pr_info("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
257 (int) current->mm->start_stack,
258 (int) (((unsigned long) current) + 2 * PAGE_SIZE));
259 }
260
261 pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
262 pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
263 pr_info("SP: 0x%08lx\n", (long)fp);
264 pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
265 pr_info("PSR: 0x%08lx\n", (long)fp->sr);
266
267 pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
268 fp->a0, fp->a1, fp->a2, fp->a3);
269#if defined(__CSKYABIV2__)
270 pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
271 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
272 pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
273 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
274 pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
275 fp->regs[8], fp->regs[9], fp->lr);
276 pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
277 fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
278 pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
279 fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
280 pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
281 fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
282 pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
283 fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
284 pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
285 fp->rhi, fp->rlo);
286#else
287 pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
288 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
289 pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
290 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
291 pr_info("r14: 0x%08lx r1: 0x%08lx r15: 0x%08lx\n",
292 fp->regs[8], fp->regs[9], fp->lr);
293#endif
294
295 pr_info("\nCODE:");
296 tp = ((unsigned char *) fp->pc) - 0x20;
297 tp += ((int)tp % 4) ? 2 : 0;
298 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
299 if ((i % 0x10) == 0)
300 pr_cont("\n%08x: ", (int) (tp + i));
301 pr_cont("%08x ", (int) *sp++);
302 }
303 pr_cont("\n");
304
305 pr_info("\nKERNEL STACK:");
306 tp = ((unsigned char *) fp) - 0x40;
307 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
308 if ((i % 0x10) == 0)
309 pr_cont("\n%08x: ", (int) (tp + i));
310 pr_cont("%08x ", (int) *sp++);
311 }
312 pr_cont("\n");
313
314 show_stack(NULL, (unsigned long *)fp->regs[4]);
315 return;
316}