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