1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 */ 5 6 #include <linux/ptrace.h> 7 #include <linux/tracehook.h> 8 #include <linux/sched/task_stack.h> 9 #include <linux/regset.h> 10 #include <linux/unistd.h> 11 #include <linux/elf.h> 12 13 static struct callee_regs *task_callee_regs(struct task_struct *tsk) 14 { 15 struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg; 16 return tmp; 17 } 18 19 static int genregs_get(struct task_struct *target, 20 const struct user_regset *regset, 21 unsigned int pos, unsigned int count, 22 void *kbuf, void __user *ubuf) 23 { 24 const struct pt_regs *ptregs = task_pt_regs(target); 25 const struct callee_regs *cregs = task_callee_regs(target); 26 int ret = 0; 27 unsigned int stop_pc_val; 28 29 #define REG_O_CHUNK(START, END, PTR) \ 30 if (!ret) \ 31 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ 32 offsetof(struct user_regs_struct, START), \ 33 offsetof(struct user_regs_struct, END)); 34 35 #define REG_O_ONE(LOC, PTR) \ 36 if (!ret) \ 37 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ 38 offsetof(struct user_regs_struct, LOC), \ 39 offsetof(struct user_regs_struct, LOC) + 4); 40 41 #define REG_O_ZERO(LOC) \ 42 if (!ret) \ 43 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \ 44 offsetof(struct user_regs_struct, LOC), \ 45 offsetof(struct user_regs_struct, LOC) + 4); 46 47 REG_O_ZERO(pad); 48 REG_O_ONE(scratch.bta, &ptregs->bta); 49 REG_O_ONE(scratch.lp_start, &ptregs->lp_start); 50 REG_O_ONE(scratch.lp_end, &ptregs->lp_end); 51 REG_O_ONE(scratch.lp_count, &ptregs->lp_count); 52 REG_O_ONE(scratch.status32, &ptregs->status32); 53 REG_O_ONE(scratch.ret, &ptregs->ret); 54 REG_O_ONE(scratch.blink, &ptregs->blink); 55 REG_O_ONE(scratch.fp, &ptregs->fp); 56 REG_O_ONE(scratch.gp, &ptregs->r26); 57 REG_O_ONE(scratch.r12, &ptregs->r12); 58 REG_O_ONE(scratch.r11, &ptregs->r11); 59 REG_O_ONE(scratch.r10, &ptregs->r10); 60 REG_O_ONE(scratch.r9, &ptregs->r9); 61 REG_O_ONE(scratch.r8, &ptregs->r8); 62 REG_O_ONE(scratch.r7, &ptregs->r7); 63 REG_O_ONE(scratch.r6, &ptregs->r6); 64 REG_O_ONE(scratch.r5, &ptregs->r5); 65 REG_O_ONE(scratch.r4, &ptregs->r4); 66 REG_O_ONE(scratch.r3, &ptregs->r3); 67 REG_O_ONE(scratch.r2, &ptregs->r2); 68 REG_O_ONE(scratch.r1, &ptregs->r1); 69 REG_O_ONE(scratch.r0, &ptregs->r0); 70 REG_O_ONE(scratch.sp, &ptregs->sp); 71 72 REG_O_ZERO(pad2); 73 74 REG_O_ONE(callee.r25, &cregs->r25); 75 REG_O_ONE(callee.r24, &cregs->r24); 76 REG_O_ONE(callee.r23, &cregs->r23); 77 REG_O_ONE(callee.r22, &cregs->r22); 78 REG_O_ONE(callee.r21, &cregs->r21); 79 REG_O_ONE(callee.r20, &cregs->r20); 80 REG_O_ONE(callee.r19, &cregs->r19); 81 REG_O_ONE(callee.r18, &cregs->r18); 82 REG_O_ONE(callee.r17, &cregs->r17); 83 REG_O_ONE(callee.r16, &cregs->r16); 84 REG_O_ONE(callee.r15, &cregs->r15); 85 REG_O_ONE(callee.r14, &cregs->r14); 86 REG_O_ONE(callee.r13, &cregs->r13); 87 88 REG_O_ONE(efa, &target->thread.fault_address); 89 90 if (!ret) { 91 if (in_brkpt_trap(ptregs)) { 92 stop_pc_val = target->thread.fault_address; 93 pr_debug("\t\tstop_pc (brk-pt)\n"); 94 } else { 95 stop_pc_val = ptregs->ret; 96 pr_debug("\t\tstop_pc (others)\n"); 97 } 98 99 REG_O_ONE(stop_pc, &stop_pc_val); 100 } 101 102 return ret; 103 } 104 105 static int genregs_set(struct task_struct *target, 106 const struct user_regset *regset, 107 unsigned int pos, unsigned int count, 108 const void *kbuf, const void __user *ubuf) 109 { 110 const struct pt_regs *ptregs = task_pt_regs(target); 111 const struct callee_regs *cregs = task_callee_regs(target); 112 int ret = 0; 113 114 #define REG_IN_CHUNK(FIRST, NEXT, PTR) \ 115 if (!ret) \ 116 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ 117 (void *)(PTR), \ 118 offsetof(struct user_regs_struct, FIRST), \ 119 offsetof(struct user_regs_struct, NEXT)); 120 121 #define REG_IN_ONE(LOC, PTR) \ 122 if (!ret) \ 123 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ 124 (void *)(PTR), \ 125 offsetof(struct user_regs_struct, LOC), \ 126 offsetof(struct user_regs_struct, LOC) + 4); 127 128 #define REG_IGNORE_ONE(LOC) \ 129 if (!ret) \ 130 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \ 131 offsetof(struct user_regs_struct, LOC), \ 132 offsetof(struct user_regs_struct, LOC) + 4); 133 134 REG_IGNORE_ONE(pad); 135 136 REG_IN_ONE(scratch.bta, &ptregs->bta); 137 REG_IN_ONE(scratch.lp_start, &ptregs->lp_start); 138 REG_IN_ONE(scratch.lp_end, &ptregs->lp_end); 139 REG_IN_ONE(scratch.lp_count, &ptregs->lp_count); 140 141 REG_IGNORE_ONE(scratch.status32); 142 143 REG_IN_ONE(scratch.ret, &ptregs->ret); 144 REG_IN_ONE(scratch.blink, &ptregs->blink); 145 REG_IN_ONE(scratch.fp, &ptregs->fp); 146 REG_IN_ONE(scratch.gp, &ptregs->r26); 147 REG_IN_ONE(scratch.r12, &ptregs->r12); 148 REG_IN_ONE(scratch.r11, &ptregs->r11); 149 REG_IN_ONE(scratch.r10, &ptregs->r10); 150 REG_IN_ONE(scratch.r9, &ptregs->r9); 151 REG_IN_ONE(scratch.r8, &ptregs->r8); 152 REG_IN_ONE(scratch.r7, &ptregs->r7); 153 REG_IN_ONE(scratch.r6, &ptregs->r6); 154 REG_IN_ONE(scratch.r5, &ptregs->r5); 155 REG_IN_ONE(scratch.r4, &ptregs->r4); 156 REG_IN_ONE(scratch.r3, &ptregs->r3); 157 REG_IN_ONE(scratch.r2, &ptregs->r2); 158 REG_IN_ONE(scratch.r1, &ptregs->r1); 159 REG_IN_ONE(scratch.r0, &ptregs->r0); 160 REG_IN_ONE(scratch.sp, &ptregs->sp); 161 162 REG_IGNORE_ONE(pad2); 163 164 REG_IN_ONE(callee.r25, &cregs->r25); 165 REG_IN_ONE(callee.r24, &cregs->r24); 166 REG_IN_ONE(callee.r23, &cregs->r23); 167 REG_IN_ONE(callee.r22, &cregs->r22); 168 REG_IN_ONE(callee.r21, &cregs->r21); 169 REG_IN_ONE(callee.r20, &cregs->r20); 170 REG_IN_ONE(callee.r19, &cregs->r19); 171 REG_IN_ONE(callee.r18, &cregs->r18); 172 REG_IN_ONE(callee.r17, &cregs->r17); 173 REG_IN_ONE(callee.r16, &cregs->r16); 174 REG_IN_ONE(callee.r15, &cregs->r15); 175 REG_IN_ONE(callee.r14, &cregs->r14); 176 REG_IN_ONE(callee.r13, &cregs->r13); 177 178 REG_IGNORE_ONE(efa); /* efa update invalid */ 179 REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */ 180 181 return ret; 182 } 183 184 #ifdef CONFIG_ISA_ARCV2 185 static int arcv2regs_get(struct task_struct *target, 186 const struct user_regset *regset, 187 unsigned int pos, unsigned int count, 188 void *kbuf, void __user *ubuf) 189 { 190 const struct pt_regs *regs = task_pt_regs(target); 191 int ret, copy_sz; 192 193 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS)) 194 copy_sz = sizeof(struct user_regs_arcv2); 195 else 196 copy_sz = 4; /* r30 only */ 197 198 /* 199 * itemized copy not needed like above as layout of regs (r30,r58,r59) 200 * is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2) 201 */ 202 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, ®s->r30, 203 0, copy_sz); 204 205 return ret; 206 } 207 208 static int arcv2regs_set(struct task_struct *target, 209 const struct user_regset *regset, 210 unsigned int pos, unsigned int count, 211 const void *kbuf, const void __user *ubuf) 212 { 213 const struct pt_regs *regs = task_pt_regs(target); 214 int ret, copy_sz; 215 216 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS)) 217 copy_sz = sizeof(struct user_regs_arcv2); 218 else 219 copy_sz = 4; /* r30 only */ 220 221 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)®s->r30, 222 0, copy_sz); 223 224 return ret; 225 } 226 227 #endif 228 229 enum arc_getset { 230 REGSET_CMN, 231 REGSET_ARCV2, 232 }; 233 234 static const struct user_regset arc_regsets[] = { 235 [REGSET_CMN] = { 236 .core_note_type = NT_PRSTATUS, 237 .n = ELF_NGREG, 238 .size = sizeof(unsigned long), 239 .align = sizeof(unsigned long), 240 .get = genregs_get, 241 .set = genregs_set, 242 }, 243 #ifdef CONFIG_ISA_ARCV2 244 [REGSET_ARCV2] = { 245 .core_note_type = NT_ARC_V2, 246 .n = ELF_ARCV2REG, 247 .size = sizeof(unsigned long), 248 .align = sizeof(unsigned long), 249 .get = arcv2regs_get, 250 .set = arcv2regs_set, 251 }, 252 #endif 253 }; 254 255 static const struct user_regset_view user_arc_view = { 256 .name = UTS_MACHINE, 257 .e_machine = EM_ARC_INUSE, 258 .regsets = arc_regsets, 259 .n = ARRAY_SIZE(arc_regsets) 260 }; 261 262 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 263 { 264 return &user_arc_view; 265 } 266 267 void ptrace_disable(struct task_struct *child) 268 { 269 } 270 271 long arch_ptrace(struct task_struct *child, long request, 272 unsigned long addr, unsigned long data) 273 { 274 int ret = -EIO; 275 276 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data); 277 278 switch (request) { 279 case PTRACE_GET_THREAD_AREA: 280 ret = put_user(task_thread_info(child)->thr_ptr, 281 (unsigned long __user *)data); 282 break; 283 default: 284 ret = ptrace_request(child, request, addr, data); 285 break; 286 } 287 288 return ret; 289 } 290 291 asmlinkage int syscall_trace_entry(struct pt_regs *regs) 292 { 293 if (tracehook_report_syscall_entry(regs)) 294 return ULONG_MAX; 295 296 return regs->r8; 297 } 298 299 asmlinkage void syscall_trace_exit(struct pt_regs *regs) 300 { 301 tracehook_report_syscall_exit(regs, 0); 302 } 303