arch/csky/kernel/ptrace.c

   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, &regs, 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 void ptrace_disable(struct task_struct *child)
 197 {
 198         singlestep_disable(child);
 199 }
 200
 201 long 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
 215 asmlinkage 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
 227 asmlinkage 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
 238 extern void show_stack(struct task_struct *task, unsigned long *stack);
 239 void 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 }