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