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 enum arc_getset { 188 REGSET_GENERAL, 189 }; 190 191 static const struct user_regset arc_regsets[] = { 192 [REGSET_GENERAL] = { 193 .core_note_type = NT_PRSTATUS, 194 .n = ELF_NGREG, 195 .size = sizeof(unsigned long), 196 .align = sizeof(unsigned long), 197 .get = genregs_get, 198 .set = genregs_set, 199 } 200 }; 201 202 static const struct user_regset_view user_arc_view = { 203 .name = UTS_MACHINE, 204 .e_machine = EM_ARC_INUSE, 205 .regsets = arc_regsets, 206 .n = ARRAY_SIZE(arc_regsets) 207 }; 208 209 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 210 { 211 return &user_arc_view; 212 } 213 214 void ptrace_disable(struct task_struct *child) 215 { 216 } 217 218 long arch_ptrace(struct task_struct *child, long request, 219 unsigned long addr, unsigned long data) 220 { 221 int ret = -EIO; 222 223 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data); 224 225 switch (request) { 226 case PTRACE_GET_THREAD_AREA: 227 ret = put_user(task_thread_info(child)->thr_ptr, 228 (unsigned long __user *)data); 229 break; 230 default: 231 ret = ptrace_request(child, request, addr, data); 232 break; 233 } 234 235 return ret; 236 } 237 238 asmlinkage int syscall_trace_entry(struct pt_regs *regs) 239 { 240 if (tracehook_report_syscall_entry(regs)) 241 return ULONG_MAX; 242 243 return regs->r8; 244 } 245 246 asmlinkage void syscall_trace_exit(struct pt_regs *regs) 247 { 248 tracehook_report_syscall_exit(regs, 0); 249 } 250