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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/processor.h>
22#include <asm/asm-offsets.h>
23
24#include <abi/regdef.h>
25
26#define CREATE_TRACE_POINTS
27#include <trace/events/syscalls.h>
28
29/* sets the trace bits. */
30#define TRACE_MODE_SI (1 << 14)
31#define TRACE_MODE_RUN 0
32#define TRACE_MODE_MASK ~(0x3 << 14)
33
34/*
35 * Make sure the single step bit is not set.
36 */
37static void singlestep_disable(struct task_struct *tsk)
38{
39 struct pt_regs *regs;
40
41 regs = task_pt_regs(tsk);
42 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;
43
44 /* Enable irq */
45 regs->sr |= BIT(6);
46}
47
48static void singlestep_enable(struct task_struct *tsk)
49{
50 struct pt_regs *regs;
51
52 regs = task_pt_regs(tsk);
53 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;
54
55 /* Disable irq */
56 regs->sr &= ~BIT(6);
57}
58
59/*
60 * Make sure the single step bit is set.
61 */
62void user_enable_single_step(struct task_struct *child)
63{
64 singlestep_enable(child);
65}
66
67void user_disable_single_step(struct task_struct *child)
68{
69 singlestep_disable(child);
70}
71
72enum csky_regset {
73 REGSET_GPR,
74 REGSET_FPR,
75};
76
77static int gpr_get(struct task_struct *target,
78 const struct user_regset *regset,
79 struct membuf to)
80{
81 struct pt_regs *regs = task_pt_regs(target);
82
83 /* Abiv1 regs->tls is fake and we need sync here. */
84 regs->tls = task_thread_info(target)->tp_value;
85
86 return membuf_write(&to, regs, sizeof(regs));
87}
88
89static int gpr_set(struct task_struct *target,
90 const struct user_regset *regset,
91 unsigned int pos, unsigned int count,
92 const void *kbuf, const void __user *ubuf)
93{
94 int ret;
95 struct pt_regs regs;
96
97 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0, -1);
98 if (ret)
99 return ret;
100
101 regs.sr = task_pt_regs(target)->sr;
102#ifdef CONFIG_CPU_HAS_HILO
103 regs.dcsr = task_pt_regs(target)->dcsr;
104#endif
105 task_thread_info(target)->tp_value = regs.tls;
106
107 *task_pt_regs(target) = regs;
108
109 return 0;
110}
111
112static int fpr_get(struct task_struct *target,
113 const struct user_regset *regset,
114 struct membuf to)
115{
116 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
117
118#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
119 int i;
120 struct user_fp tmp = *regs;
121
122 for (i = 0; i < 16; i++) {
123 tmp.vr[i*4] = regs->vr[i*2];
124 tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];
125 }
126
127 for (i = 0; i < 32; i++)
128 tmp.vr[64 + i] = regs->vr[32 + i];
129
130 return membuf_write(&to, &tmp, sizeof(tmp));
131#else
132 return membuf_write(&to, regs, sizeof(*regs));
133#endif
134}
135
136static int fpr_set(struct task_struct *target,
137 const struct user_regset *regset,
138 unsigned int pos, unsigned int count,
139 const void *kbuf, const void __user *ubuf)
140{
141 int ret;
142 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
143
144#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
145 int i;
146 struct user_fp tmp;
147
148 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
149
150 *regs = tmp;
151
152 for (i = 0; i < 16; i++) {
153 regs->vr[i*2] = tmp.vr[i*4];
154 regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];
155 }
156
157 for (i = 0; i < 32; i++)
158 regs->vr[32 + i] = tmp.vr[64 + i];
159#else
160 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
161#endif
162
163 return ret;
164}
165
166static const struct user_regset csky_regsets[] = {
167 [REGSET_GPR] = {
168 .core_note_type = NT_PRSTATUS,
169 .n = sizeof(struct pt_regs) / sizeof(u32),
170 .size = sizeof(u32),
171 .align = sizeof(u32),
172 .regset_get = gpr_get,
173 .set = gpr_set,
174 },
175 [REGSET_FPR] = {
176 .core_note_type = NT_PRFPREG,
177 .n = sizeof(struct user_fp) / sizeof(u32),
178 .size = sizeof(u32),
179 .align = sizeof(u32),
180 .regset_get = fpr_get,
181 .set = fpr_set,
182 },
183};
184
185static const struct user_regset_view user_csky_view = {
186 .name = "csky",
187 .e_machine = ELF_ARCH,
188 .regsets = csky_regsets,
189 .n = ARRAY_SIZE(csky_regsets),
190};
191
192const struct user_regset_view *task_user_regset_view(struct task_struct *task)
193{
194 return &user_csky_view;
195}
196
197struct pt_regs_offset {
198 const char *name;
199 int offset;
200};
201
202#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
203#define REG_OFFSET_END {.name = NULL, .offset = 0}
204
205static const struct pt_regs_offset regoffset_table[] = {
206 REG_OFFSET_NAME(tls),
207 REG_OFFSET_NAME(lr),
208 REG_OFFSET_NAME(pc),
209 REG_OFFSET_NAME(sr),
210 REG_OFFSET_NAME(usp),
211 REG_OFFSET_NAME(orig_a0),
212 REG_OFFSET_NAME(a0),
213 REG_OFFSET_NAME(a1),
214 REG_OFFSET_NAME(a2),
215 REG_OFFSET_NAME(a3),
216 REG_OFFSET_NAME(regs[0]),
217 REG_OFFSET_NAME(regs[1]),
218 REG_OFFSET_NAME(regs[2]),
219 REG_OFFSET_NAME(regs[3]),
220 REG_OFFSET_NAME(regs[4]),
221 REG_OFFSET_NAME(regs[5]),
222 REG_OFFSET_NAME(regs[6]),
223 REG_OFFSET_NAME(regs[7]),
224 REG_OFFSET_NAME(regs[8]),
225 REG_OFFSET_NAME(regs[9]),
226#if defined(__CSKYABIV2__)
227 REG_OFFSET_NAME(exregs[0]),
228 REG_OFFSET_NAME(exregs[1]),
229 REG_OFFSET_NAME(exregs[2]),
230 REG_OFFSET_NAME(exregs[3]),
231 REG_OFFSET_NAME(exregs[4]),
232 REG_OFFSET_NAME(exregs[5]),
233 REG_OFFSET_NAME(exregs[6]),
234 REG_OFFSET_NAME(exregs[7]),
235 REG_OFFSET_NAME(exregs[8]),
236 REG_OFFSET_NAME(exregs[9]),
237 REG_OFFSET_NAME(exregs[10]),
238 REG_OFFSET_NAME(exregs[11]),
239 REG_OFFSET_NAME(exregs[12]),
240 REG_OFFSET_NAME(exregs[13]),
241 REG_OFFSET_NAME(exregs[14]),
242 REG_OFFSET_NAME(rhi),
243 REG_OFFSET_NAME(rlo),
244 REG_OFFSET_NAME(dcsr),
245#endif
246 REG_OFFSET_END,
247};
248
249/**
250 * regs_query_register_offset() - query register offset from its name
251 * @name: the name of a register
252 *
253 * regs_query_register_offset() returns the offset of a register in struct
254 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
255 */
256int regs_query_register_offset(const char *name)
257{
258 const struct pt_regs_offset *roff;
259
260 for (roff = regoffset_table; roff->name != NULL; roff++)
261 if (!strcmp(roff->name, name))
262 return roff->offset;
263 return -EINVAL;
264}
265
266/**
267 * regs_within_kernel_stack() - check the address in the stack
268 * @regs: pt_regs which contains kernel stack pointer.
269 * @addr: address which is checked.
270 *
271 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
272 * If @addr is within the kernel stack, it returns true. If not, returns false.
273 */
274static bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
275{
276 return (addr & ~(THREAD_SIZE - 1)) ==
277 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1));
278}
279
280/**
281 * regs_get_kernel_stack_nth() - get Nth entry of the stack
282 * @regs: pt_regs which contains kernel stack pointer.
283 * @n: stack entry number.
284 *
285 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
286 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
287 * this returns 0.
288 */
289unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
290{
291 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
292
293 addr += n;
294 if (regs_within_kernel_stack(regs, (unsigned long)addr))
295 return *addr;
296 else
297 return 0;
298}
299
300void ptrace_disable(struct task_struct *child)
301{
302 singlestep_disable(child);
303}
304
305long arch_ptrace(struct task_struct *child, long request,
306 unsigned long addr, unsigned long data)
307{
308 long ret = -EIO;
309
310 switch (request) {
311 default:
312 ret = ptrace_request(child, request, addr, data);
313 break;
314 }
315
316 return ret;
317}
318
319asmlinkage int syscall_trace_enter(struct pt_regs *regs)
320{
321 if (test_thread_flag(TIF_SYSCALL_TRACE))
322 if (tracehook_report_syscall_entry(regs))
323 return -1;
324
325 if (secure_computing() == -1)
326 return -1;
327
328 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
329 trace_sys_enter(regs, syscall_get_nr(current, regs));
330
331 audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
332 return 0;
333}
334
335asmlinkage void syscall_trace_exit(struct pt_regs *regs)
336{
337 audit_syscall_exit(regs);
338
339 if (test_thread_flag(TIF_SYSCALL_TRACE))
340 tracehook_report_syscall_exit(regs, 0);
341
342 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
343 trace_sys_exit(regs, syscall_get_return_value(current, regs));
344}
345
346void show_regs(struct pt_regs *fp)
347{
348 pr_info("\nCURRENT PROCESS:\n\n");
349 pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
350
351 if (current->mm) {
352 pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
353 (int) current->mm->start_code,
354 (int) current->mm->end_code,
355 (int) current->mm->start_data,
356 (int) current->mm->end_data,
357 (int) current->mm->end_data,
358 (int) current->mm->brk);
359 pr_info("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
360 (int) current->mm->start_stack,
361 (int) (((unsigned long) current) + 2 * PAGE_SIZE));
362 }
363
364 pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
365 pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
366 pr_info("SP: 0x%08lx\n", (long)fp);
367 pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
368 pr_info("PSR: 0x%08lx\n", (long)fp->sr);
369
370 pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
371 fp->a0, fp->a1, fp->a2, fp->a3);
372#if defined(__CSKYABIV2__)
373 pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
374 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
375 pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
376 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
377 pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
378 fp->regs[8], fp->regs[9], fp->lr);
379 pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
380 fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
381 pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
382 fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
383 pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
384 fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
385 pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
386 fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
387 pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
388 fp->rhi, fp->rlo);
389#else
390 pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
391 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
392 pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
393 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
394 pr_info("r14: 0x%08lx r1: 0x%08lx\n",
395 fp->regs[8], fp->regs[9]);
396#endif
397
398 return;
399}