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