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 */ 38 static 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 46 static 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 */ 57 void user_enable_single_step(struct task_struct *child) 58 { 59 singlestep_enable(child); 60 } 61 62 void user_disable_single_step(struct task_struct *child) 63 { 64 singlestep_disable(child); 65 } 66 67 enum csky_regset { 68 REGSET_GPR, 69 REGSET_FPR, 70 }; 71 72 static 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 87 static 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 } 109 110 static 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 } 134 135 static 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 } 164 165 static 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 }; 183 184 static 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 }; 190 191 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 192 { 193 return &user_csky_view; 194 } 195 196 struct pt_regs_offset { 197 const char *name; 198 int offset; 199 }; 200 201 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} 202 #define REG_OFFSET_END {.name = NULL, .offset = 0} 203 204 static const struct pt_regs_offset regoffset_table[] = { 205 REG_OFFSET_NAME(tls), 206 REG_OFFSET_NAME(lr), 207 REG_OFFSET_NAME(pc), 208 REG_OFFSET_NAME(sr), 209 REG_OFFSET_NAME(usp), 210 REG_OFFSET_NAME(orig_a0), 211 REG_OFFSET_NAME(a0), 212 REG_OFFSET_NAME(a1), 213 REG_OFFSET_NAME(a2), 214 REG_OFFSET_NAME(a3), 215 REG_OFFSET_NAME(regs[0]), 216 REG_OFFSET_NAME(regs[1]), 217 REG_OFFSET_NAME(regs[2]), 218 REG_OFFSET_NAME(regs[3]), 219 REG_OFFSET_NAME(regs[4]), 220 REG_OFFSET_NAME(regs[5]), 221 REG_OFFSET_NAME(regs[6]), 222 REG_OFFSET_NAME(regs[7]), 223 REG_OFFSET_NAME(regs[8]), 224 REG_OFFSET_NAME(regs[9]), 225 #if defined(__CSKYABIV2__) 226 REG_OFFSET_NAME(exregs[0]), 227 REG_OFFSET_NAME(exregs[1]), 228 REG_OFFSET_NAME(exregs[2]), 229 REG_OFFSET_NAME(exregs[3]), 230 REG_OFFSET_NAME(exregs[4]), 231 REG_OFFSET_NAME(exregs[5]), 232 REG_OFFSET_NAME(exregs[6]), 233 REG_OFFSET_NAME(exregs[7]), 234 REG_OFFSET_NAME(exregs[8]), 235 REG_OFFSET_NAME(exregs[9]), 236 REG_OFFSET_NAME(exregs[10]), 237 REG_OFFSET_NAME(exregs[11]), 238 REG_OFFSET_NAME(exregs[12]), 239 REG_OFFSET_NAME(exregs[13]), 240 REG_OFFSET_NAME(exregs[14]), 241 REG_OFFSET_NAME(rhi), 242 REG_OFFSET_NAME(rlo), 243 REG_OFFSET_NAME(dcsr), 244 #endif 245 REG_OFFSET_END, 246 }; 247 248 /** 249 * regs_query_register_offset() - query register offset from its name 250 * @name: the name of a register 251 * 252 * regs_query_register_offset() returns the offset of a register in struct 253 * pt_regs from its name. If the name is invalid, this returns -EINVAL; 254 */ 255 int regs_query_register_offset(const char *name) 256 { 257 const struct pt_regs_offset *roff; 258 259 for (roff = regoffset_table; roff->name != NULL; roff++) 260 if (!strcmp(roff->name, name)) 261 return roff->offset; 262 return -EINVAL; 263 } 264 265 /** 266 * regs_within_kernel_stack() - check the address in the stack 267 * @regs: pt_regs which contains kernel stack pointer. 268 * @addr: address which is checked. 269 * 270 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). 271 * If @addr is within the kernel stack, it returns true. If not, returns false. 272 */ 273 static bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) 274 { 275 return (addr & ~(THREAD_SIZE - 1)) == 276 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)); 277 } 278 279 /** 280 * regs_get_kernel_stack_nth() - get Nth entry of the stack 281 * @regs: pt_regs which contains kernel stack pointer. 282 * @n: stack entry number. 283 * 284 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which 285 * is specified by @regs. If the @n th entry is NOT in the kernel stack, 286 * this returns 0. 287 */ 288 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) 289 { 290 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); 291 292 addr += n; 293 if (regs_within_kernel_stack(regs, (unsigned long)addr)) 294 return *addr; 295 else 296 return 0; 297 } 298 299 void ptrace_disable(struct task_struct *child) 300 { 301 singlestep_disable(child); 302 } 303 304 long arch_ptrace(struct task_struct *child, long request, 305 unsigned long addr, unsigned long data) 306 { 307 long ret = -EIO; 308 309 switch (request) { 310 default: 311 ret = ptrace_request(child, request, addr, data); 312 break; 313 } 314 315 return ret; 316 } 317 318 asmlinkage void syscall_trace_enter(struct pt_regs *regs) 319 { 320 if (test_thread_flag(TIF_SYSCALL_TRACE)) 321 if (tracehook_report_syscall_entry(regs)) 322 syscall_set_nr(current, regs, -1); 323 324 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) 325 trace_sys_enter(regs, syscall_get_nr(current, regs)); 326 327 audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3); 328 } 329 330 asmlinkage void syscall_trace_exit(struct pt_regs *regs) 331 { 332 audit_syscall_exit(regs); 333 334 if (test_thread_flag(TIF_SYSCALL_TRACE)) 335 tracehook_report_syscall_exit(regs, 0); 336 337 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) 338 trace_sys_exit(regs, syscall_get_return_value(current, regs)); 339 } 340 341 extern void show_stack(struct task_struct *task, unsigned long *stack); 342 void show_regs(struct pt_regs *fp) 343 { 344 unsigned long *sp; 345 unsigned char *tp; 346 int i; 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 r15: 0x%08lx\n", 395 fp->regs[8], fp->regs[9], fp->lr); 396 #endif 397 398 pr_info("\nCODE:"); 399 tp = ((unsigned char *) fp->pc) - 0x20; 400 tp += ((int)tp % 4) ? 2 : 0; 401 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) { 402 if ((i % 0x10) == 0) 403 pr_cont("\n%08x: ", (int) (tp + i)); 404 pr_cont("%08x ", (int) *sp++); 405 } 406 pr_cont("\n"); 407 408 pr_info("\nKERNEL STACK:"); 409 tp = ((unsigned char *) fp) - 0x40; 410 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) { 411 if ((i % 0x10) == 0) 412 pr_cont("\n%08x: ", (int) (tp + i)); 413 pr_cont("%08x ", (int) *sp++); 414 } 415 pr_cont("\n"); 416 417 show_stack(NULL, (unsigned long *)fp->regs[4]); 418 return; 419 } 420