1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1992 Ross Biro 7 * Copyright (C) Linus Torvalds 8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle 9 * Copyright (C) 1996 David S. Miller 10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com 11 * Copyright (C) 1999 MIPS Technologies, Inc. 12 * Copyright (C) 2000 Ulf Carlsson 13 * 14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit 15 * binaries. 16 */ 17 #include <linux/compiler.h> 18 #include <linux/compat.h> 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/sched/task_stack.h> 22 #include <linux/mm.h> 23 #include <linux/errno.h> 24 #include <linux/ptrace.h> 25 #include <linux/smp.h> 26 #include <linux/security.h> 27 28 #include <asm/cpu.h> 29 #include <asm/dsp.h> 30 #include <asm/fpu.h> 31 #include <asm/mipsregs.h> 32 #include <asm/mipsmtregs.h> 33 #include <asm/pgtable.h> 34 #include <asm/page.h> 35 #include <asm/reg.h> 36 #include <asm/syscall.h> 37 #include <linux/uaccess.h> 38 #include <asm/bootinfo.h> 39 40 /* 41 * Tracing a 32-bit process with a 64-bit strace and vice versa will not 42 * work. I don't know how to fix this. 43 */ 44 long compat_arch_ptrace(struct task_struct *child, compat_long_t request, 45 compat_ulong_t caddr, compat_ulong_t cdata) 46 { 47 int addr = caddr; 48 int data = cdata; 49 int ret; 50 51 switch (request) { 52 53 /* 54 * Read 4 bytes of the other process' storage 55 * data is a pointer specifying where the user wants the 56 * 4 bytes copied into 57 * addr is a pointer in the user's storage that contains an 8 byte 58 * address in the other process of the 4 bytes that is to be read 59 * (this is run in a 32-bit process looking at a 64-bit process) 60 * when I and D space are separate, these will need to be fixed. 61 */ 62 case PTRACE_PEEKTEXT_3264: 63 case PTRACE_PEEKDATA_3264: { 64 u32 tmp; 65 int copied; 66 u32 __user * addrOthers; 67 68 ret = -EIO; 69 70 /* Get the addr in the other process that we want to read */ 71 if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) 72 break; 73 74 copied = ptrace_access_vm(child, (u64)addrOthers, &tmp, 75 sizeof(tmp), FOLL_FORCE); 76 if (copied != sizeof(tmp)) 77 break; 78 ret = put_user(tmp, (u32 __user *) (unsigned long) data); 79 break; 80 } 81 82 /* Read the word at location addr in the USER area. */ 83 case PTRACE_PEEKUSR: { 84 struct pt_regs *regs; 85 union fpureg *fregs; 86 unsigned int tmp; 87 88 regs = task_pt_regs(child); 89 ret = 0; /* Default return value. */ 90 91 switch (addr) { 92 case 0 ... 31: 93 tmp = regs->regs[addr]; 94 break; 95 case FPR_BASE ... FPR_BASE + 31: 96 if (!tsk_used_math(child)) { 97 /* FP not yet used */ 98 tmp = -1; 99 break; 100 } 101 fregs = get_fpu_regs(child); 102 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { 103 /* 104 * The odd registers are actually the high 105 * order bits of the values stored in the even 106 * registers. 107 */ 108 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE], 109 addr & 1); 110 break; 111 } 112 tmp = get_fpr64(&fregs[addr - FPR_BASE], 0); 113 break; 114 case PC: 115 tmp = regs->cp0_epc; 116 break; 117 case CAUSE: 118 tmp = regs->cp0_cause; 119 break; 120 case BADVADDR: 121 tmp = regs->cp0_badvaddr; 122 break; 123 case MMHI: 124 tmp = regs->hi; 125 break; 126 case MMLO: 127 tmp = regs->lo; 128 break; 129 case FPC_CSR: 130 tmp = child->thread.fpu.fcr31; 131 break; 132 case FPC_EIR: 133 /* implementation / version register */ 134 tmp = boot_cpu_data.fpu_id; 135 break; 136 case DSP_BASE ... DSP_BASE + 5: { 137 dspreg_t *dregs; 138 139 if (!cpu_has_dsp) { 140 tmp = 0; 141 ret = -EIO; 142 goto out; 143 } 144 dregs = __get_dsp_regs(child); 145 tmp = (unsigned long) (dregs[addr - DSP_BASE]); 146 break; 147 } 148 case DSP_CONTROL: 149 if (!cpu_has_dsp) { 150 tmp = 0; 151 ret = -EIO; 152 goto out; 153 } 154 tmp = child->thread.dsp.dspcontrol; 155 break; 156 default: 157 tmp = 0; 158 ret = -EIO; 159 goto out; 160 } 161 ret = put_user(tmp, (unsigned __user *) (unsigned long) data); 162 break; 163 } 164 165 /* 166 * Write 4 bytes into the other process' storage 167 * data is the 4 bytes that the user wants written 168 * addr is a pointer in the user's storage that contains an 169 * 8 byte address in the other process where the 4 bytes 170 * that is to be written 171 * (this is run in a 32-bit process looking at a 64-bit process) 172 * when I and D space are separate, these will need to be fixed. 173 */ 174 case PTRACE_POKETEXT_3264: 175 case PTRACE_POKEDATA_3264: { 176 u32 __user * addrOthers; 177 178 /* Get the addr in the other process that we want to write into */ 179 ret = -EIO; 180 if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) 181 break; 182 ret = 0; 183 if (ptrace_access_vm(child, (u64)addrOthers, &data, 184 sizeof(data), 185 FOLL_FORCE | FOLL_WRITE) == sizeof(data)) 186 break; 187 ret = -EIO; 188 break; 189 } 190 191 case PTRACE_POKEUSR: { 192 struct pt_regs *regs; 193 ret = 0; 194 regs = task_pt_regs(child); 195 196 switch (addr) { 197 case 0 ... 31: 198 regs->regs[addr] = data; 199 /* System call number may have been changed */ 200 if (addr == 2) 201 mips_syscall_update_nr(child, regs); 202 else if (addr == 4 && 203 mips_syscall_is_indirect(child, regs)) 204 mips_syscall_update_nr(child, regs); 205 break; 206 case FPR_BASE ... FPR_BASE + 31: { 207 union fpureg *fregs = get_fpu_regs(child); 208 209 if (!tsk_used_math(child)) { 210 /* FP not yet used */ 211 memset(&child->thread.fpu, ~0, 212 sizeof(child->thread.fpu)); 213 child->thread.fpu.fcr31 = 0; 214 } 215 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) { 216 /* 217 * The odd registers are actually the high 218 * order bits of the values stored in the even 219 * registers. 220 */ 221 set_fpr32(&fregs[(addr & ~1) - FPR_BASE], 222 addr & 1, data); 223 break; 224 } 225 set_fpr64(&fregs[addr - FPR_BASE], 0, data); 226 break; 227 } 228 case PC: 229 regs->cp0_epc = data; 230 break; 231 case MMHI: 232 regs->hi = data; 233 break; 234 case MMLO: 235 regs->lo = data; 236 break; 237 case FPC_CSR: 238 child->thread.fpu.fcr31 = data; 239 break; 240 case DSP_BASE ... DSP_BASE + 5: { 241 dspreg_t *dregs; 242 243 if (!cpu_has_dsp) { 244 ret = -EIO; 245 break; 246 } 247 248 dregs = __get_dsp_regs(child); 249 dregs[addr - DSP_BASE] = data; 250 break; 251 } 252 case DSP_CONTROL: 253 if (!cpu_has_dsp) { 254 ret = -EIO; 255 break; 256 } 257 child->thread.dsp.dspcontrol = data; 258 break; 259 default: 260 /* The rest are not allowed. */ 261 ret = -EIO; 262 break; 263 } 264 break; 265 } 266 267 case PTRACE_GETREGS: 268 ret = ptrace_getregs(child, 269 (struct user_pt_regs __user *) (__u64) data); 270 break; 271 272 case PTRACE_SETREGS: 273 ret = ptrace_setregs(child, 274 (struct user_pt_regs __user *) (__u64) data); 275 break; 276 277 case PTRACE_GETFPREGS: 278 ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data); 279 break; 280 281 case PTRACE_SETFPREGS: 282 ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data); 283 break; 284 285 case PTRACE_GET_THREAD_AREA: 286 ret = put_user(task_thread_info(child)->tp_value, 287 (unsigned int __user *) (unsigned long) data); 288 break; 289 290 case PTRACE_GET_THREAD_AREA_3264: 291 ret = put_user(task_thread_info(child)->tp_value, 292 (unsigned long __user *) (unsigned long) data); 293 break; 294 295 case PTRACE_GET_WATCH_REGS: 296 ret = ptrace_get_watch_regs(child, 297 (struct pt_watch_regs __user *) (unsigned long) addr); 298 break; 299 300 case PTRACE_SET_WATCH_REGS: 301 ret = ptrace_set_watch_regs(child, 302 (struct pt_watch_regs __user *) (unsigned long) addr); 303 break; 304 305 default: 306 ret = compat_ptrace_request(child, request, addr, data); 307 break; 308 } 309 out: 310 return ret; 311 } 312