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