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/regset.h> 12 #include <linux/unistd.h> 13 #include <linux/elf.h> 14 15 static struct callee_regs *task_callee_regs(struct task_struct *tsk) 16 { 17 struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg; 18 return tmp; 19 } 20 21 static int genregs_get(struct task_struct *target, 22 const struct user_regset *regset, 23 unsigned int pos, unsigned int count, 24 void *kbuf, void __user *ubuf) 25 { 26 const struct pt_regs *ptregs = task_pt_regs(target); 27 const struct callee_regs *cregs = task_callee_regs(target); 28 int ret = 0; 29 unsigned int stop_pc_val; 30 31 #define REG_O_CHUNK(START, END, PTR) \ 32 if (!ret) \ 33 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ 34 offsetof(struct user_regs_struct, START), \ 35 offsetof(struct user_regs_struct, END)); 36 37 #define REG_O_ONE(LOC, PTR) \ 38 if (!ret) \ 39 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ 40 offsetof(struct user_regs_struct, LOC), \ 41 offsetof(struct user_regs_struct, LOC) + 4); 42 43 #define REG_O_ZERO(LOC) \ 44 if (!ret) \ 45 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \ 46 offsetof(struct user_regs_struct, LOC), \ 47 offsetof(struct user_regs_struct, LOC) + 4); 48 49 REG_O_ZERO(pad); 50 REG_O_ONE(scratch.bta, &ptregs->bta); 51 REG_O_ONE(scratch.lp_start, &ptregs->lp_start); 52 REG_O_ONE(scratch.lp_end, &ptregs->lp_end); 53 REG_O_ONE(scratch.lp_count, &ptregs->lp_count); 54 REG_O_ONE(scratch.status32, &ptregs->status32); 55 REG_O_ONE(scratch.ret, &ptregs->ret); 56 REG_O_ONE(scratch.blink, &ptregs->blink); 57 REG_O_ONE(scratch.fp, &ptregs->fp); 58 REG_O_ONE(scratch.gp, &ptregs->r26); 59 REG_O_ONE(scratch.r12, &ptregs->r12); 60 REG_O_ONE(scratch.r11, &ptregs->r11); 61 REG_O_ONE(scratch.r10, &ptregs->r10); 62 REG_O_ONE(scratch.r9, &ptregs->r9); 63 REG_O_ONE(scratch.r8, &ptregs->r8); 64 REG_O_ONE(scratch.r7, &ptregs->r7); 65 REG_O_ONE(scratch.r6, &ptregs->r6); 66 REG_O_ONE(scratch.r5, &ptregs->r5); 67 REG_O_ONE(scratch.r4, &ptregs->r4); 68 REG_O_ONE(scratch.r3, &ptregs->r3); 69 REG_O_ONE(scratch.r2, &ptregs->r2); 70 REG_O_ONE(scratch.r1, &ptregs->r1); 71 REG_O_ONE(scratch.r0, &ptregs->r0); 72 REG_O_ONE(scratch.sp, &ptregs->sp); 73 74 REG_O_ZERO(pad2); 75 76 REG_O_ONE(callee.r25, &cregs->r25); 77 REG_O_ONE(callee.r24, &cregs->r24); 78 REG_O_ONE(callee.r23, &cregs->r23); 79 REG_O_ONE(callee.r22, &cregs->r22); 80 REG_O_ONE(callee.r21, &cregs->r21); 81 REG_O_ONE(callee.r20, &cregs->r20); 82 REG_O_ONE(callee.r19, &cregs->r19); 83 REG_O_ONE(callee.r18, &cregs->r18); 84 REG_O_ONE(callee.r17, &cregs->r17); 85 REG_O_ONE(callee.r16, &cregs->r16); 86 REG_O_ONE(callee.r15, &cregs->r15); 87 REG_O_ONE(callee.r14, &cregs->r14); 88 REG_O_ONE(callee.r13, &cregs->r13); 89 90 REG_O_ONE(efa, &target->thread.fault_address); 91 92 if (!ret) { 93 if (in_brkpt_trap(ptregs)) { 94 stop_pc_val = target->thread.fault_address; 95 pr_debug("\t\tstop_pc (brk-pt)\n"); 96 } else { 97 stop_pc_val = ptregs->ret; 98 pr_debug("\t\tstop_pc (others)\n"); 99 } 100 101 REG_O_ONE(stop_pc, &stop_pc_val); 102 } 103 104 return ret; 105 } 106 107 static int genregs_set(struct task_struct *target, 108 const struct user_regset *regset, 109 unsigned int pos, unsigned int count, 110 const void *kbuf, const void __user *ubuf) 111 { 112 const struct pt_regs *ptregs = task_pt_regs(target); 113 const struct callee_regs *cregs = task_callee_regs(target); 114 int ret = 0; 115 116 #define REG_IN_CHUNK(FIRST, NEXT, PTR) \ 117 if (!ret) \ 118 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ 119 (void *)(PTR), \ 120 offsetof(struct user_regs_struct, FIRST), \ 121 offsetof(struct user_regs_struct, NEXT)); 122 123 #define REG_IN_ONE(LOC, PTR) \ 124 if (!ret) \ 125 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ 126 (void *)(PTR), \ 127 offsetof(struct user_regs_struct, LOC), \ 128 offsetof(struct user_regs_struct, LOC) + 4); 129 130 #define REG_IGNORE_ONE(LOC) \ 131 if (!ret) \ 132 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \ 133 offsetof(struct user_regs_struct, LOC), \ 134 offsetof(struct user_regs_struct, LOC) + 4); 135 136 REG_IGNORE_ONE(pad); 137 138 REG_IN_ONE(scratch.bta, &ptregs->bta); 139 REG_IN_ONE(scratch.lp_start, &ptregs->lp_start); 140 REG_IN_ONE(scratch.lp_end, &ptregs->lp_end); 141 REG_IN_ONE(scratch.lp_count, &ptregs->lp_count); 142 143 REG_IGNORE_ONE(scratch.status32); 144 145 REG_IN_ONE(scratch.ret, &ptregs->ret); 146 REG_IN_ONE(scratch.blink, &ptregs->blink); 147 REG_IN_ONE(scratch.fp, &ptregs->fp); 148 REG_IN_ONE(scratch.gp, &ptregs->r26); 149 REG_IN_ONE(scratch.r12, &ptregs->r12); 150 REG_IN_ONE(scratch.r11, &ptregs->r11); 151 REG_IN_ONE(scratch.r10, &ptregs->r10); 152 REG_IN_ONE(scratch.r9, &ptregs->r9); 153 REG_IN_ONE(scratch.r8, &ptregs->r8); 154 REG_IN_ONE(scratch.r7, &ptregs->r7); 155 REG_IN_ONE(scratch.r6, &ptregs->r6); 156 REG_IN_ONE(scratch.r5, &ptregs->r5); 157 REG_IN_ONE(scratch.r4, &ptregs->r4); 158 REG_IN_ONE(scratch.r3, &ptregs->r3); 159 REG_IN_ONE(scratch.r2, &ptregs->r2); 160 REG_IN_ONE(scratch.r1, &ptregs->r1); 161 REG_IN_ONE(scratch.r0, &ptregs->r0); 162 REG_IN_ONE(scratch.sp, &ptregs->sp); 163 164 REG_IGNORE_ONE(pad2); 165 166 REG_IN_ONE(callee.r25, &cregs->r25); 167 REG_IN_ONE(callee.r24, &cregs->r24); 168 REG_IN_ONE(callee.r23, &cregs->r23); 169 REG_IN_ONE(callee.r22, &cregs->r22); 170 REG_IN_ONE(callee.r21, &cregs->r21); 171 REG_IN_ONE(callee.r20, &cregs->r20); 172 REG_IN_ONE(callee.r19, &cregs->r19); 173 REG_IN_ONE(callee.r18, &cregs->r18); 174 REG_IN_ONE(callee.r17, &cregs->r17); 175 REG_IN_ONE(callee.r16, &cregs->r16); 176 REG_IN_ONE(callee.r15, &cregs->r15); 177 REG_IN_ONE(callee.r14, &cregs->r14); 178 REG_IN_ONE(callee.r13, &cregs->r13); 179 180 REG_IGNORE_ONE(efa); /* efa update invalid */ 181 REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */ 182 183 return ret; 184 } 185 186 enum arc_getset { 187 REGSET_GENERAL, 188 }; 189 190 static const struct user_regset arc_regsets[] = { 191 [REGSET_GENERAL] = { 192 .core_note_type = NT_PRSTATUS, 193 .n = ELF_NGREG, 194 .size = sizeof(unsigned long), 195 .align = sizeof(unsigned long), 196 .get = genregs_get, 197 .set = genregs_set, 198 } 199 }; 200 201 static const struct user_regset_view user_arc_view = { 202 .name = UTS_MACHINE, 203 .e_machine = EM_ARC_INUSE, 204 .regsets = arc_regsets, 205 .n = ARRAY_SIZE(arc_regsets) 206 }; 207 208 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 209 { 210 return &user_arc_view; 211 } 212 213 void ptrace_disable(struct task_struct *child) 214 { 215 } 216 217 long arch_ptrace(struct task_struct *child, long request, 218 unsigned long addr, unsigned long data) 219 { 220 int ret = -EIO; 221 222 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data); 223 224 switch (request) { 225 case PTRACE_GET_THREAD_AREA: 226 ret = put_user(task_thread_info(child)->thr_ptr, 227 (unsigned long __user *)data); 228 break; 229 default: 230 ret = ptrace_request(child, request, addr, data); 231 break; 232 } 233 234 return ret; 235 } 236 237 asmlinkage int syscall_trace_entry(struct pt_regs *regs) 238 { 239 if (tracehook_report_syscall_entry(regs)) 240 return ULONG_MAX; 241 242 return regs->r8; 243 } 244 245 asmlinkage void syscall_trace_exit(struct pt_regs *regs) 246 { 247 tracehook_report_syscall_exit(regs, 0); 248 } 249