1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #include <linux/ptrace.h> 10 #include <linux/tracehook.h> 11 #include <linux/sched/task_stack.h> 12 #include <linux/regset.h> 13 #include <linux/unistd.h> 14 #include <linux/elf.h> 15 16 static struct callee_regs *task_callee_regs(struct task_struct *tsk) 17 { 18 struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg; 19 return tmp; 20 } 21 22 static int genregs_get(struct task_struct *target, 23 const struct user_regset *regset, 24 unsigned int pos, unsigned int count, 25 void *kbuf, void __user *ubuf) 26 { 27 const struct pt_regs *ptregs = task_pt_regs(target); 28 const struct callee_regs *cregs = task_callee_regs(target); 29 int ret = 0; 30 unsigned int stop_pc_val; 31 32 #define REG_O_CHUNK(START, END, PTR) \ 33 if (!ret) \ 34 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ 35 offsetof(struct user_regs_struct, START), \ 36 offsetof(struct user_regs_struct, END)); 37 38 #define REG_O_ONE(LOC, PTR) \ 39 if (!ret) \ 40 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ 41 offsetof(struct user_regs_struct, LOC), \ 42 offsetof(struct user_regs_struct, LOC) + 4); 43 44 #define REG_O_ZERO(LOC) \ 45 if (!ret) \ 46 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \ 47 offsetof(struct user_regs_struct, LOC), \ 48 offsetof(struct user_regs_struct, LOC) + 4); 49 50 REG_O_ZERO(pad); 51 REG_O_ONE(scratch.bta, &ptregs->bta); 52 REG_O_ONE(scratch.lp_start, &ptregs->lp_start); 53 REG_O_ONE(scratch.lp_end, &ptregs->lp_end); 54 REG_O_ONE(scratch.lp_count, &ptregs->lp_count); 55 REG_O_ONE(scratch.status32, &ptregs->status32); 56 REG_O_ONE(scratch.ret, &ptregs->ret); 57 REG_O_ONE(scratch.blink, &ptregs->blink); 58 REG_O_ONE(scratch.fp, &ptregs->fp); 59 REG_O_ONE(scratch.gp, &ptregs->r26); 60 REG_O_ONE(scratch.r12, &ptregs->r12); 61 REG_O_ONE(scratch.r11, &ptregs->r11); 62 REG_O_ONE(scratch.r10, &ptregs->r10); 63 REG_O_ONE(scratch.r9, &ptregs->r9); 64 REG_O_ONE(scratch.r8, &ptregs->r8); 65 REG_O_ONE(scratch.r7, &ptregs->r7); 66 REG_O_ONE(scratch.r6, &ptregs->r6); 67 REG_O_ONE(scratch.r5, &ptregs->r5); 68 REG_O_ONE(scratch.r4, &ptregs->r4); 69 REG_O_ONE(scratch.r3, &ptregs->r3); 70 REG_O_ONE(scratch.r2, &ptregs->r2); 71 REG_O_ONE(scratch.r1, &ptregs->r1); 72 REG_O_ONE(scratch.r0, &ptregs->r0); 73 REG_O_ONE(scratch.sp, &ptregs->sp); 74 75 REG_O_ZERO(pad2); 76 77 REG_O_ONE(callee.r25, &cregs->r25); 78 REG_O_ONE(callee.r24, &cregs->r24); 79 REG_O_ONE(callee.r23, &cregs->r23); 80 REG_O_ONE(callee.r22, &cregs->r22); 81 REG_O_ONE(callee.r21, &cregs->r21); 82 REG_O_ONE(callee.r20, &cregs->r20); 83 REG_O_ONE(callee.r19, &cregs->r19); 84 REG_O_ONE(callee.r18, &cregs->r18); 85 REG_O_ONE(callee.r17, &cregs->r17); 86 REG_O_ONE(callee.r16, &cregs->r16); 87 REG_O_ONE(callee.r15, &cregs->r15); 88 REG_O_ONE(callee.r14, &cregs->r14); 89 REG_O_ONE(callee.r13, &cregs->r13); 90 91 REG_O_ONE(efa, &target->thread.fault_address); 92 93 if (!ret) { 94 if (in_brkpt_trap(ptregs)) { 95 stop_pc_val = target->thread.fault_address; 96 pr_debug("\t\tstop_pc (brk-pt)\n"); 97 } else { 98 stop_pc_val = ptregs->ret; 99 pr_debug("\t\tstop_pc (others)\n"); 100 } 101 102 REG_O_ONE(stop_pc, &stop_pc_val); 103 } 104 105 return ret; 106 } 107 108 static int genregs_set(struct task_struct *target, 109 const struct user_regset *regset, 110 unsigned int pos, unsigned int count, 111 const void *kbuf, const void __user *ubuf) 112 { 113 const struct pt_regs *ptregs = task_pt_regs(target); 114 const struct callee_regs *cregs = task_callee_regs(target); 115 int ret = 0; 116 117 #define REG_IN_CHUNK(FIRST, NEXT, PTR) \ 118 if (!ret) \ 119 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ 120 (void *)(PTR), \ 121 offsetof(struct user_regs_struct, FIRST), \ 122 offsetof(struct user_regs_struct, NEXT)); 123 124 #define REG_IN_ONE(LOC, PTR) \ 125 if (!ret) \ 126 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ 127 (void *)(PTR), \ 128 offsetof(struct user_regs_struct, LOC), \ 129 offsetof(struct user_regs_struct, LOC) + 4); 130 131 #define REG_IGNORE_ONE(LOC) \ 132 if (!ret) \ 133 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \ 134 offsetof(struct user_regs_struct, LOC), \ 135 offsetof(struct user_regs_struct, LOC) + 4); 136 137 REG_IGNORE_ONE(pad); 138 139 REG_IN_ONE(scratch.bta, &ptregs->bta); 140 REG_IN_ONE(scratch.lp_start, &ptregs->lp_start); 141 REG_IN_ONE(scratch.lp_end, &ptregs->lp_end); 142 REG_IN_ONE(scratch.lp_count, &ptregs->lp_count); 143 144 REG_IGNORE_ONE(scratch.status32); 145 146 REG_IN_ONE(scratch.ret, &ptregs->ret); 147 REG_IN_ONE(scratch.blink, &ptregs->blink); 148 REG_IN_ONE(scratch.fp, &ptregs->fp); 149 REG_IN_ONE(scratch.gp, &ptregs->r26); 150 REG_IN_ONE(scratch.r12, &ptregs->r12); 151 REG_IN_ONE(scratch.r11, &ptregs->r11); 152 REG_IN_ONE(scratch.r10, &ptregs->r10); 153 REG_IN_ONE(scratch.r9, &ptregs->r9); 154 REG_IN_ONE(scratch.r8, &ptregs->r8); 155 REG_IN_ONE(scratch.r7, &ptregs->r7); 156 REG_IN_ONE(scratch.r6, &ptregs->r6); 157 REG_IN_ONE(scratch.r5, &ptregs->r5); 158 REG_IN_ONE(scratch.r4, &ptregs->r4); 159 REG_IN_ONE(scratch.r3, &ptregs->r3); 160 REG_IN_ONE(scratch.r2, &ptregs->r2); 161 REG_IN_ONE(scratch.r1, &ptregs->r1); 162 REG_IN_ONE(scratch.r0, &ptregs->r0); 163 REG_IN_ONE(scratch.sp, &ptregs->sp); 164 165 REG_IGNORE_ONE(pad2); 166 167 REG_IN_ONE(callee.r25, &cregs->r25); 168 REG_IN_ONE(callee.r24, &cregs->r24); 169 REG_IN_ONE(callee.r23, &cregs->r23); 170 REG_IN_ONE(callee.r22, &cregs->r22); 171 REG_IN_ONE(callee.r21, &cregs->r21); 172 REG_IN_ONE(callee.r20, &cregs->r20); 173 REG_IN_ONE(callee.r19, &cregs->r19); 174 REG_IN_ONE(callee.r18, &cregs->r18); 175 REG_IN_ONE(callee.r17, &cregs->r17); 176 REG_IN_ONE(callee.r16, &cregs->r16); 177 REG_IN_ONE(callee.r15, &cregs->r15); 178 REG_IN_ONE(callee.r14, &cregs->r14); 179 REG_IN_ONE(callee.r13, &cregs->r13); 180 181 REG_IGNORE_ONE(efa); /* efa update invalid */ 182 REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */ 183 184 return ret; 185 } 186 187 #ifdef CONFIG_ISA_ARCV2 188 static int arcv2regs_get(struct task_struct *target, 189 const struct user_regset *regset, 190 unsigned int pos, unsigned int count, 191 void *kbuf, void __user *ubuf) 192 { 193 const struct pt_regs *regs = task_pt_regs(target); 194 int ret, copy_sz; 195 196 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS)) 197 copy_sz = sizeof(struct user_regs_arcv2); 198 else 199 copy_sz = 4; /* r30 only */ 200 201 /* 202 * itemized copy not needed like above as layout of regs (r30,r58,r59) 203 * is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2) 204 */ 205 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, ®s->r30, 206 0, copy_sz); 207 208 return ret; 209 } 210 211 static int arcv2regs_set(struct task_struct *target, 212 const struct user_regset *regset, 213 unsigned int pos, unsigned int count, 214 const void *kbuf, const void __user *ubuf) 215 { 216 const struct pt_regs *regs = task_pt_regs(target); 217 int ret, copy_sz; 218 219 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS)) 220 copy_sz = sizeof(struct user_regs_arcv2); 221 else 222 copy_sz = 4; /* r30 only */ 223 224 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)®s->r30, 225 0, copy_sz); 226 227 return ret; 228 } 229 230 #endif 231 232 enum arc_getset { 233 REGSET_CMN, 234 REGSET_ARCV2, 235 }; 236 237 static const struct user_regset arc_regsets[] = { 238 [REGSET_CMN] = { 239 .core_note_type = NT_PRSTATUS, 240 .n = ELF_NGREG, 241 .size = sizeof(unsigned long), 242 .align = sizeof(unsigned long), 243 .get = genregs_get, 244 .set = genregs_set, 245 }, 246 #ifdef CONFIG_ISA_ARCV2 247 [REGSET_ARCV2] = { 248 .core_note_type = NT_ARC_V2, 249 .n = ELF_ARCV2REG, 250 .size = sizeof(unsigned long), 251 .align = sizeof(unsigned long), 252 .get = arcv2regs_get, 253 .set = arcv2regs_set, 254 }, 255 #endif 256 }; 257 258 static const struct user_regset_view user_arc_view = { 259 .name = UTS_MACHINE, 260 .e_machine = EM_ARC_INUSE, 261 .regsets = arc_regsets, 262 .n = ARRAY_SIZE(arc_regsets) 263 }; 264 265 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 266 { 267 return &user_arc_view; 268 } 269 270 void ptrace_disable(struct task_struct *child) 271 { 272 } 273 274 long arch_ptrace(struct task_struct *child, long request, 275 unsigned long addr, unsigned long data) 276 { 277 int ret = -EIO; 278 279 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data); 280 281 switch (request) { 282 case PTRACE_GET_THREAD_AREA: 283 ret = put_user(task_thread_info(child)->thr_ptr, 284 (unsigned long __user *)data); 285 break; 286 default: 287 ret = ptrace_request(child, request, addr, data); 288 break; 289 } 290 291 return ret; 292 } 293 294 asmlinkage int syscall_trace_entry(struct pt_regs *regs) 295 { 296 if (tracehook_report_syscall_entry(regs)) 297 return ULONG_MAX; 298 299 return regs->r8; 300 } 301 302 asmlinkage void syscall_trace_exit(struct pt_regs *regs) 303 { 304 tracehook_report_syscall_exit(regs, 0); 305 } 306