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/arch/mips/kernel/ptrace32.c

http://github.com/mirrors/linux
C | 318 lines | 235 code | 27 blank | 56 comment | 24 complexity | c5c409f58645db7361cf42dc9213b7c0 MD5 | raw file
  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 */
 44long 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		unsigned int tmp;
 86
 87		regs = task_pt_regs(child);
 88		ret = 0;  /* Default return value. */
 89
 90		switch (addr) {
 91		case 0 ... 31:
 92			tmp = regs->regs[addr];
 93			break;
 94#ifdef CONFIG_MIPS_FP_SUPPORT
 95		case FPR_BASE ... FPR_BASE + 31: {
 96			union fpureg *fregs;
 97
 98			if (!tsk_used_math(child)) {
 99				/* FP not yet used */
100				tmp = -1;
101				break;
102			}
103			fregs = get_fpu_regs(child);
104			if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
105				/*
106				 * The odd registers are actually the high
107				 * order bits of the values stored in the even
108				 * registers.
109				 */
110				tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
111						addr & 1);
112				break;
113			}
114			tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
115			break;
116		}
117		case FPC_CSR:
118			tmp = child->thread.fpu.fcr31;
119			break;
120		case FPC_EIR:
121			/* implementation / version register */
122			tmp = boot_cpu_data.fpu_id;
123			break;
124#endif /* CONFIG_MIPS_FP_SUPPORT */
125		case PC:
126			tmp = regs->cp0_epc;
127			break;
128		case CAUSE:
129			tmp = regs->cp0_cause;
130			break;
131		case BADVADDR:
132			tmp = regs->cp0_badvaddr;
133			break;
134		case MMHI:
135			tmp = regs->hi;
136			break;
137		case MMLO:
138			tmp = regs->lo;
139			break;
140		case DSP_BASE ... DSP_BASE + 5: {
141			dspreg_t *dregs;
142
143			if (!cpu_has_dsp) {
144				tmp = 0;
145				ret = -EIO;
146				goto out;
147			}
148			dregs = __get_dsp_regs(child);
149			tmp = dregs[addr - DSP_BASE];
150			break;
151		}
152		case DSP_CONTROL:
153			if (!cpu_has_dsp) {
154				tmp = 0;
155				ret = -EIO;
156				goto out;
157			}
158			tmp = child->thread.dsp.dspcontrol;
159			break;
160		default:
161			tmp = 0;
162			ret = -EIO;
163			goto out;
164		}
165		ret = put_user(tmp, (unsigned __user *) (unsigned long) data);
166		break;
167	}
168
169	/*
170	 * Write 4 bytes into the other process' storage
171	 *  data is the 4 bytes that the user wants written
172	 *  addr is a pointer in the user's storage that contains an
173	 *	8 byte address in the other process where the 4 bytes
174	 *	that is to be written
175	 * (this is run in a 32-bit process looking at a 64-bit process)
176	 * when I and D space are separate, these will need to be fixed.
177	 */
178	case PTRACE_POKETEXT_3264:
179	case PTRACE_POKEDATA_3264: {
180		u32 __user * addrOthers;
181
182		/* Get the addr in the other process that we want to write into */
183		ret = -EIO;
184		if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
185			break;
186		ret = 0;
187		if (ptrace_access_vm(child, (u64)addrOthers, &data,
188					sizeof(data),
189					FOLL_FORCE | FOLL_WRITE) == sizeof(data))
190			break;
191		ret = -EIO;
192		break;
193	}
194
195	case PTRACE_POKEUSR: {
196		struct pt_regs *regs;
197		ret = 0;
198		regs = task_pt_regs(child);
199
200		switch (addr) {
201		case 0 ... 31:
202			regs->regs[addr] = data;
203			/* System call number may have been changed */
204			if (addr == 2)
205				mips_syscall_update_nr(child, regs);
206			else if (addr == 4 &&
207				 mips_syscall_is_indirect(child, regs))
208				mips_syscall_update_nr(child, regs);
209			break;
210#ifdef CONFIG_MIPS_FP_SUPPORT
211		case FPR_BASE ... FPR_BASE + 31: {
212			union fpureg *fregs = get_fpu_regs(child);
213
214			if (!tsk_used_math(child)) {
215				/* FP not yet used  */
216				memset(&child->thread.fpu, ~0,
217				       sizeof(child->thread.fpu));
218				child->thread.fpu.fcr31 = 0;
219			}
220			if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
221				/*
222				 * The odd registers are actually the high
223				 * order bits of the values stored in the even
224				 * registers.
225				 */
226				set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
227					  addr & 1, data);
228				break;
229			}
230			set_fpr64(&fregs[addr - FPR_BASE], 0, data);
231			break;
232		}
233		case FPC_CSR:
234			child->thread.fpu.fcr31 = data;
235			break;
236#endif /* CONFIG_MIPS_FP_SUPPORT */
237		case PC:
238			regs->cp0_epc = data;
239			break;
240		case MMHI:
241			regs->hi = data;
242			break;
243		case MMLO:
244			regs->lo = data;
245			break;
246		case DSP_BASE ... DSP_BASE + 5: {
247			dspreg_t *dregs;
248
249			if (!cpu_has_dsp) {
250				ret = -EIO;
251				break;
252			}
253
254			dregs = __get_dsp_regs(child);
255			dregs[addr - DSP_BASE] = data;
256			break;
257		}
258		case DSP_CONTROL:
259			if (!cpu_has_dsp) {
260				ret = -EIO;
261				break;
262			}
263			child->thread.dsp.dspcontrol = data;
264			break;
265		default:
266			/* The rest are not allowed. */
267			ret = -EIO;
268			break;
269		}
270		break;
271		}
272
273	case PTRACE_GETREGS:
274		ret = ptrace_getregs(child,
275				(struct user_pt_regs __user *) (__u64) data);
276		break;
277
278	case PTRACE_SETREGS:
279		ret = ptrace_setregs(child,
280				(struct user_pt_regs __user *) (__u64) data);
281		break;
282
283#ifdef CONFIG_MIPS_FP_SUPPORT
284	case PTRACE_GETFPREGS:
285		ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data);
286		break;
287
288	case PTRACE_SETFPREGS:
289		ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data);
290		break;
291#endif
292	case PTRACE_GET_THREAD_AREA:
293		ret = put_user(task_thread_info(child)->tp_value,
294				(unsigned int __user *) (unsigned long) data);
295		break;
296
297	case PTRACE_GET_THREAD_AREA_3264:
298		ret = put_user(task_thread_info(child)->tp_value,
299				(unsigned long __user *) (unsigned long) data);
300		break;
301
302	case PTRACE_GET_WATCH_REGS:
303		ret = ptrace_get_watch_regs(child,
304			(struct pt_watch_regs __user *) (unsigned long) addr);
305		break;
306
307	case PTRACE_SET_WATCH_REGS:
308		ret = ptrace_set_watch_regs(child,
309			(struct pt_watch_regs __user *) (unsigned long) addr);
310		break;
311
312	default:
313		ret = compat_ptrace_request(child, request, addr, data);
314		break;
315	}
316out:
317	return ret;
318}