| 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 | |
| 47 | long 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), FOLL_FORCE); |
| 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), |
| 183 | FOLL_FORCE | FOLL_WRITE) == sizeof(tmp)) |
| 184 | break; |
| 185 | ret = -EIO; |
| 186 | break; |
| 187 | } |
| 188 | |
| 189 | /* write the word at location addr in the USER area */ |
| 190 | case PTRACE_POKEUSR: { |
| 191 | unsigned long index; |
| 192 | |
| 193 | ret = -EIO; |
| 194 | /* convert to index and check */ |
| 195 | index = (unsigned long) addr >> 2; |
| 196 | if ((addr & 3) || (index > PT_FPSCR32)) |
| 197 | break; |
| 198 | |
| 199 | CHECK_FULL_REGS(child->thread.regs); |
| 200 | if (index < PT_FPR0) { |
| 201 | ret = ptrace_put_reg(child, index, data); |
| 202 | } else { |
| 203 | flush_fp_to_thread(child); |
| 204 | /* |
| 205 | * the user space code considers the floating point |
| 206 | * to be an array of unsigned int (32 bits) - the |
| 207 | * index passed in is based on this assumption. |
| 208 | */ |
| 209 | ((unsigned int *)child->thread.fp_state.fpr) |
| 210 | [FPRINDEX(index)] = data; |
| 211 | ret = 0; |
| 212 | } |
| 213 | break; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Write 4 bytes into the other process' pt_regs area |
| 218 | * data is the 4 bytes that the user wants written |
| 219 | * addr is the offset into the other process' pt_regs structure |
| 220 | * that is to be written into |
| 221 | * (this is run in a 32-bit process looking at a 64-bit process) |
| 222 | */ |
| 223 | case PPC_PTRACE_POKEUSR_3264: { |
| 224 | u32 index; |
| 225 | u32 numReg; |
| 226 | |
| 227 | ret = -EIO; |
| 228 | /* Determine which register the user wants */ |
| 229 | index = (u64)addr >> 2; |
| 230 | numReg = index / 2; |
| 231 | |
| 232 | /* |
| 233 | * Validate the input - check to see if address is on the |
| 234 | * wrong boundary or beyond the end of the user area |
| 235 | */ |
| 236 | if ((addr & 3) || (numReg > PT_FPSCR)) |
| 237 | break; |
| 238 | CHECK_FULL_REGS(child->thread.regs); |
| 239 | if (numReg < PT_FPR0) { |
| 240 | unsigned long freg; |
| 241 | ret = ptrace_get_reg(child, numReg, &freg); |
| 242 | if (ret) |
| 243 | break; |
| 244 | if (index % 2) |
| 245 | freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); |
| 246 | else |
| 247 | freg = (freg & 0xfffffffful) | (data << 32); |
| 248 | ret = ptrace_put_reg(child, numReg, freg); |
| 249 | } else { |
| 250 | u64 *tmp; |
| 251 | flush_fp_to_thread(child); |
| 252 | /* get 64 bit FPR ... */ |
| 253 | tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0]; |
| 254 | /* ... write the 32 bit part we want */ |
| 255 | ((u32 *)tmp)[index % 2] = data; |
| 256 | ret = 0; |
| 257 | } |
| 258 | break; |
| 259 | } |
| 260 | |
| 261 | case PTRACE_GET_DEBUGREG: { |
| 262 | #ifndef CONFIG_PPC_ADV_DEBUG_REGS |
| 263 | unsigned long dabr_fake; |
| 264 | #endif |
| 265 | ret = -EINVAL; |
| 266 | /* We only support one DABR and no IABRS at the moment */ |
| 267 | if (addr > 0) |
| 268 | break; |
| 269 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
| 270 | ret = put_user(child->thread.debug.dac1, (u32 __user *)data); |
| 271 | #else |
| 272 | dabr_fake = ( |
| 273 | (child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) | |
| 274 | (child->thread.hw_brk.type & HW_BRK_TYPE_DABR)); |
| 275 | ret = put_user(dabr_fake, (u32 __user *)data); |
| 276 | #endif |
| 277 | break; |
| 278 | } |
| 279 | |
| 280 | case PTRACE_GETREGS: /* Get all pt_regs from the child. */ |
| 281 | return copy_regset_to_user( |
| 282 | child, task_user_regset_view(current), 0, |
| 283 | 0, PT_REGS_COUNT * sizeof(compat_long_t), |
| 284 | compat_ptr(data)); |
| 285 | |
| 286 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| 287 | return copy_regset_from_user( |
| 288 | child, task_user_regset_view(current), 0, |
| 289 | 0, PT_REGS_COUNT * sizeof(compat_long_t), |
| 290 | compat_ptr(data)); |
| 291 | |
| 292 | case PTRACE_GETFPREGS: |
| 293 | case PTRACE_SETFPREGS: |
| 294 | case PTRACE_GETVRREGS: |
| 295 | case PTRACE_SETVRREGS: |
| 296 | case PTRACE_GETVSRREGS: |
| 297 | case PTRACE_SETVSRREGS: |
| 298 | case PTRACE_GETREGS64: |
| 299 | case PTRACE_SETREGS64: |
| 300 | case PTRACE_KILL: |
| 301 | case PTRACE_SINGLESTEP: |
| 302 | case PTRACE_DETACH: |
| 303 | case PTRACE_SET_DEBUGREG: |
| 304 | case PTRACE_SYSCALL: |
| 305 | case PTRACE_CONT: |
| 306 | case PPC_PTRACE_GETHWDBGINFO: |
| 307 | case PPC_PTRACE_SETHWDEBUG: |
| 308 | case PPC_PTRACE_DELHWDEBUG: |
| 309 | ret = arch_ptrace(child, request, addr, data); |
| 310 | break; |
| 311 | |
| 312 | default: |
| 313 | ret = compat_ptrace_request(child, request, addr, data); |
| 314 | break; |
| 315 | } |
| 316 | |
| 317 | return ret; |
| 318 | } |