1/* 2 * ptrace for 32-bit processes running on a 64-bit kernel. 3 * 4 * PowerPC version 5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 6 * 7 * Derived from "arch/m68k/kernel/ptrace.c" 8 * Copyright (C) 1994 by Hamish Macdonald 9 * Taken from linux/kernel/ptrace.c and modified for M680x0. 10 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds 11 * 12 * Modified by Cort Dougan (cort@hq.fsmlabs.com) 13 * and Paul Mackerras (paulus@samba.org). 14 * 15 * This file is subject to the terms and conditions of the GNU General 16 * Public License. See the file COPYING in the main directory of 17 * this archive for more details. 18 */ 19 20#include <linux/kernel.h> 21#include <linux/sched.h> 22#include <linux/mm.h> 23#include <linux/smp.h> 24#include <linux/errno.h> 25#include <linux/ptrace.h> 26#include <linux/regset.h> 27#include <linux/user.h> 28#include <linux/security.h> 29#include <linux/signal.h> 30#include <linux/compat.h> 31 32#include <asm/uaccess.h> 33#include <asm/page.h> 34#include <asm/pgtable.h> 35#include <asm/switch_to.h> 36 37/* 38 * does not yet catch signals sent when the child dies. 39 * in exit.c or in signal.c. 40 */ 41 42/* Macros to workout the correct index for the FPR in the thread struct */ 43#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1) 44#define FPRHALF(i) (((i) - PT_FPR0) & 1) 45#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i) 46 47long compat_arch_ptrace(struct task_struct *child, compat_long_t request, 48 compat_ulong_t caddr, compat_ulong_t cdata) 49{ 50 unsigned long addr = caddr; 51 unsigned long data = cdata; 52 int ret; 53 54 switch (request) { 55 /* 56 * Read 4 bytes of the other process' storage 57 * data is a pointer specifying where the user wants the 58 * 4 bytes copied into 59 * addr is a pointer in the user's storage that contains an 8 byte 60 * address in the other process of the 4 bytes that is to be read 61 * (this is run in a 32-bit process looking at a 64-bit process) 62 * when I and D space are separate, these will need to be fixed. 63 */ 64 case PPC_PTRACE_PEEKTEXT_3264: 65 case PPC_PTRACE_PEEKDATA_3264: { 66 u32 tmp; 67 int copied; 68 u32 __user * addrOthers; 69 70 ret = -EIO; 71 72 /* Get the addr in the other process that we want to read */ 73 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) 74 break; 75 76 copied = access_process_vm(child, (u64)addrOthers, &tmp, 77 sizeof(tmp), 0); 78 if (copied != sizeof(tmp)) 79 break; 80 ret = put_user(tmp, (u32 __user *)data); 81 break; 82 } 83 84 /* Read a register (specified by ADDR) out of the "user area" */ 85 case PTRACE_PEEKUSR: { 86 int index; 87 unsigned long tmp; 88 89 ret = -EIO; 90 /* convert to index and check */ 91 index = (unsigned long) addr >> 2; 92 if ((addr & 3) || (index > PT_FPSCR32)) 93 break; 94 95 CHECK_FULL_REGS(child->thread.regs); 96 if (index < PT_FPR0) { 97 ret = ptrace_get_reg(child, index, &tmp); 98 if (ret) 99 break; 100 } else { 101 flush_fp_to_thread(child); 102 /* 103 * the user space code considers the floating point 104 * to be an array of unsigned int (32 bits) - the 105 * index passed in is based on this assumption. 106 */ 107 tmp = ((unsigned int *)child->thread.fp_state.fpr) 108 [FPRINDEX(index)]; 109 } 110 ret = put_user((unsigned int)tmp, (u32 __user *)data); 111 break; 112 } 113 114 /* 115 * Read 4 bytes out of the other process' pt_regs area 116 * data is a pointer specifying where the user wants the 117 * 4 bytes copied into 118 * addr is the offset into the other process' pt_regs structure 119 * that is to be read 120 * (this is run in a 32-bit process looking at a 64-bit process) 121 */ 122 case PPC_PTRACE_PEEKUSR_3264: { 123 u32 index; 124 u32 reg32bits; 125 u64 tmp; 126 u32 numReg; 127 u32 part; 128 129 ret = -EIO; 130 /* Determine which register the user wants */ 131 index = (u64)addr >> 2; 132 numReg = index / 2; 133 /* Determine which part of the register the user wants */ 134 if (index % 2) 135 part = 1; /* want the 2nd half of the register (right-most). */ 136 else 137 part = 0; /* want the 1st half of the register (left-most). */ 138 139 /* Validate the input - check to see if address is on the wrong boundary 140 * or beyond the end of the user area 141 */ 142 if ((addr & 3) || numReg > PT_FPSCR) 143 break; 144 145 CHECK_FULL_REGS(child->thread.regs); 146 if (numReg >= PT_FPR0) { 147 flush_fp_to_thread(child); 148 /* get 64 bit FPR */ 149 tmp = child->thread.fp_state.fpr[numReg - PT_FPR0][0]; 150 } else { /* register within PT_REGS struct */ 151 unsigned long tmp2; 152 ret = ptrace_get_reg(child, numReg, &tmp2); 153 if (ret) 154 break; 155 tmp = tmp2; 156 } 157 reg32bits = ((u32*)&tmp)[part]; 158 ret = put_user(reg32bits, (u32 __user *)data); 159 break; 160 } 161 162 /* 163 * Write 4 bytes into the other process' storage 164 * data is the 4 bytes that the user wants written 165 * addr is a pointer in the user's storage that contains an 166 * 8 byte address in the other process where the 4 bytes 167 * that is to be written 168 * (this is run in a 32-bit process looking at a 64-bit process) 169 * when I and D space are separate, these will need to be fixed. 170 */ 171 case PPC_PTRACE_POKETEXT_3264: 172 case PPC_PTRACE_POKEDATA_3264: { 173 u32 tmp = data; 174 u32 __user * addrOthers; 175 176 /* Get the addr in the other process that we want to write into */ 177 ret = -EIO; 178 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) 179 break; 180 ret = 0; 181 if (access_process_vm(child, (u64)addrOthers, &tmp, 182 sizeof(tmp), 1) == sizeof(tmp)) 183 break; 184 ret = -EIO; 185 break; 186 } 187 188 /* write the word at location addr in the USER area */ 189 case PTRACE_POKEUSR: { 190 unsigned long index; 191 192 ret = -EIO; 193 /* convert to index and check */ 194 index = (unsigned long) addr >> 2; 195 if ((addr & 3) || (index > PT_FPSCR32)) 196 break; 197 198 CHECK_FULL_REGS(child->thread.regs); 199 if (index < PT_FPR0) { 200 ret = ptrace_put_reg(child, index, data); 201 } else { 202 flush_fp_to_thread(child); 203 /* 204 * the user space code considers the floating point 205 * to be an array of unsigned int (32 bits) - the 206 * index passed in is based on this assumption. 207 */ 208 ((unsigned int *)child->thread.fp_state.fpr) 209 [FPRINDEX(index)] = data; 210 ret = 0; 211 } 212 break; 213 } 214 215 /* 216 * Write 4 bytes into the other process' pt_regs area 217 * data is the 4 bytes that the user wants written 218 * addr is the offset into the other process' pt_regs structure 219 * that is to be written into 220 * (this is run in a 32-bit process looking at a 64-bit process) 221 */ 222 case PPC_PTRACE_POKEUSR_3264: { 223 u32 index; 224 u32 numReg; 225 226 ret = -EIO; 227 /* Determine which register the user wants */ 228 index = (u64)addr >> 2; 229 numReg = index / 2; 230 231 /* 232 * Validate the input - check to see if address is on the 233 * wrong boundary or beyond the end of the user area 234 */ 235 if ((addr & 3) || (numReg > PT_FPSCR)) 236 break; 237 CHECK_FULL_REGS(child->thread.regs); 238 if (numReg < PT_FPR0) { 239 unsigned long freg; 240 ret = ptrace_get_reg(child, numReg, &freg); 241 if (ret) 242 break; 243 if (index % 2) 244 freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); 245 else 246 freg = (freg & 0xfffffffful) | (data << 32); 247 ret = ptrace_put_reg(child, numReg, freg); 248 } else { 249 u64 *tmp; 250 flush_fp_to_thread(child); 251 /* get 64 bit FPR ... */ 252 tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0]; 253 /* ... write the 32 bit part we want */ 254 ((u32 *)tmp)[index % 2] = data; 255 ret = 0; 256 } 257 break; 258 } 259 260 case PTRACE_GET_DEBUGREG: { 261#ifndef CONFIG_PPC_ADV_DEBUG_REGS 262 unsigned long dabr_fake; 263#endif 264 ret = -EINVAL; 265 /* We only support one DABR and no IABRS at the moment */ 266 if (addr > 0) 267 break; 268#ifdef CONFIG_PPC_ADV_DEBUG_REGS 269 ret = put_user(child->thread.debug.dac1, (u32 __user *)data); 270#else 271 dabr_fake = ( 272 (child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) | 273 (child->thread.hw_brk.type & HW_BRK_TYPE_DABR)); 274 ret = put_user(dabr_fake, (u32 __user *)data); 275#endif 276 break; 277 } 278 279 case PTRACE_GETREGS: /* Get all pt_regs from the child. */ 280 return copy_regset_to_user( 281 child, task_user_regset_view(current), 0, 282 0, PT_REGS_COUNT * sizeof(compat_long_t), 283 compat_ptr(data)); 284 285 case PTRACE_SETREGS: /* Set all gp regs in the child. */ 286 return copy_regset_from_user( 287 child, task_user_regset_view(current), 0, 288 0, PT_REGS_COUNT * sizeof(compat_long_t), 289 compat_ptr(data)); 290 291 case PTRACE_GETFPREGS: 292 case PTRACE_SETFPREGS: 293 case PTRACE_GETVRREGS: 294 case PTRACE_SETVRREGS: 295 case PTRACE_GETVSRREGS: 296 case PTRACE_SETVSRREGS: 297 case PTRACE_GETREGS64: 298 case PTRACE_SETREGS64: 299 case PTRACE_KILL: 300 case PTRACE_SINGLESTEP: 301 case PTRACE_DETACH: 302 case PTRACE_SET_DEBUGREG: 303 case PTRACE_SYSCALL: 304 case PTRACE_CONT: 305 case PPC_PTRACE_GETHWDBGINFO: 306 case PPC_PTRACE_SETHWDEBUG: 307 case PPC_PTRACE_DELHWDEBUG: 308 ret = arch_ptrace(child, request, addr, data); 309 break; 310 311 default: 312 ret = compat_ptrace_request(child, request, addr, data); 313 break; 314 } 315 316 return ret; 317} 318