2 * linux/arch/ppc64/kernel/ptrace32.c
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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
12 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
13 * and Paul Mackerras (paulus@linuxcare.com.au).
15 * This file is subject to the terms and conditions of the GNU General
16 * Public License. See the file README.legal in the main directory of
17 * this archive for more details.
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/errno.h>
26 #include <linux/ptrace.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
29 #include <linux/signal.h>
31 #include <asm/uaccess.h>
33 #include <asm/pgtable.h>
34 #include <asm/system.h>
35 #include <asm/ptrace-common.h>
38 * does not yet catch signals sent when the child dies.
39 * in exit.c or in signal.c.
42 int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data)
44 struct task_struct *child;
48 if (request == PTRACE_TRACEME) {
49 /* are we already being traced? */
50 if (current->ptrace & PT_PTRACED)
52 ret = security_ptrace(current->parent, current);
55 /* set the ptrace bit in the process flags. */
56 current->ptrace |= PT_PTRACED;
61 read_lock(&tasklist_lock);
62 child = find_task_by_pid(pid);
64 get_task_struct(child);
65 read_unlock(&tasklist_lock);
70 if (pid == 1) /* you may not mess with init */
73 if (request == PTRACE_ATTACH) {
74 ret = ptrace_attach(child);
78 ret = ptrace_check_attach(child, request == PTRACE_KILL);
83 /* when I and D space are separate, these will need to be fixed. */
84 case PTRACE_PEEKTEXT: /* read word at location addr. */
85 case PTRACE_PEEKDATA: {
89 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
91 if (copied != sizeof(tmp))
93 ret = put_user(tmp, (u32 __user *)data);
98 * Read 4 bytes of the other process' storage
99 * data is a pointer specifying where the user wants the
100 * 4 bytes copied into
101 * addr is a pointer in the user's storage that contains an 8 byte
102 * address in the other process of the 4 bytes that is to be read
103 * (this is run in a 32-bit process looking at a 64-bit process)
104 * when I and D space are separate, these will need to be fixed.
106 case PPC_PTRACE_PEEKTEXT_3264:
107 case PPC_PTRACE_PEEKDATA_3264: {
110 u32 __user * addrOthers;
114 /* Get the addr in the other process that we want to read */
115 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
118 copied = access_process_vm(child, (u64)addrOthers, &tmp,
120 if (copied != sizeof(tmp))
122 ret = put_user(tmp, (u32 __user *)data);
126 /* Read a register (specified by ADDR) out of the "user area" */
127 case PTRACE_PEEKUSR: {
132 /* convert to index and check */
133 index = (unsigned long) addr >> 2;
134 if ((addr & 3) || (index > PT_FPSCR32))
137 if (index < PT_FPR0) {
138 tmp = get_reg(child, index);
140 flush_fp_to_thread(child);
142 * the user space code considers the floating point
143 * to be an array of unsigned int (32 bits) - the
144 * index passed in is based on this assumption.
146 tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0];
148 ret = put_user((unsigned int)tmp, (u32 __user *)data);
153 * Read 4 bytes out of the other process' pt_regs area
154 * data is a pointer specifying where the user wants the
155 * 4 bytes copied into
156 * addr is the offset into the other process' pt_regs structure
158 * (this is run in a 32-bit process looking at a 64-bit process)
160 case PPC_PTRACE_PEEKUSR_3264: {
168 /* Determine which register the user wants */
169 index = (u64)addr >> 2;
171 /* Determine which part of the register the user wants */
173 part = 1; /* want the 2nd half of the register (right-most). */
175 part = 0; /* want the 1st half of the register (left-most). */
177 /* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */
178 if ((addr & 3) || numReg > PT_FPSCR)
181 if (numReg >= PT_FPR0) {
182 flush_fp_to_thread(child);
183 tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
184 } else { /* register within PT_REGS struct */
185 tmp = get_reg(child, numReg);
187 reg32bits = ((u32*)&tmp)[part];
188 ret = put_user(reg32bits, (u32 __user *)data);
192 /* If I and D space are separate, this will have to be fixed. */
193 case PTRACE_POKETEXT: /* write the word at location addr. */
194 case PTRACE_POKEDATA: {
198 if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1)
206 * Write 4 bytes into the other process' storage
207 * data is the 4 bytes that the user wants written
208 * addr is a pointer in the user's storage that contains an
209 * 8 byte address in the other process where the 4 bytes
210 * that is to be written
211 * (this is run in a 32-bit process looking at a 64-bit process)
212 * when I and D space are separate, these will need to be fixed.
214 case PPC_PTRACE_POKETEXT_3264:
215 case PPC_PTRACE_POKEDATA_3264: {
217 u32 __user * addrOthers;
219 /* Get the addr in the other process that we want to write into */
221 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
224 if (access_process_vm(child, (u64)addrOthers, &tmp,
225 sizeof(tmp), 1) == sizeof(tmp))
231 /* write the word at location addr in the USER area */
232 case PTRACE_POKEUSR: {
236 /* convert to index and check */
237 index = (unsigned long) addr >> 2;
238 if ((addr & 3) || (index > PT_FPSCR32))
241 if (index == PT_ORIG_R3)
243 if (index < PT_FPR0) {
244 ret = put_reg(child, index, data);
246 flush_fp_to_thread(child);
248 * the user space code considers the floating point
249 * to be an array of unsigned int (32 bits) - the
250 * index passed in is based on this assumption.
252 ((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data;
259 * Write 4 bytes into the other process' pt_regs area
260 * data is the 4 bytes that the user wants written
261 * addr is the offset into the other process' pt_regs structure
262 * that is to be written into
263 * (this is run in a 32-bit process looking at a 64-bit process)
265 case PPC_PTRACE_POKEUSR_3264: {
270 /* Determine which register the user wants */
271 index = (u64)addr >> 2;
274 * Validate the input - check to see if address is on the
275 * wrong boundary or beyond the end of the user area
277 if ((addr & 3) || (numReg > PT_FPSCR))
279 /* Insure it is a register we let them change */
280 if ((numReg == PT_ORIG_R3)
281 || ((numReg > PT_CCR) && (numReg < PT_FPR0)))
283 if (numReg >= PT_FPR0) {
284 flush_fp_to_thread(child);
286 if (numReg == PT_MSR)
287 data = (data & MSR_DEBUGCHANGE)
288 | (child->thread.regs->msr & ~MSR_DEBUGCHANGE);
289 ((u32*)child->thread.regs)[index] = data;
294 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
295 case PTRACE_CONT: { /* restart after signal. */
297 if (!valid_signal(data))
299 if (request == PTRACE_SYSCALL)
300 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
302 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
303 child->exit_code = data;
304 /* make sure the single step bit is not set. */
305 clear_single_step(child);
306 wake_up_process(child);
312 * make the child exit. Best I can do is send it a sigkill.
313 * perhaps it should be put in the status that it wants to
318 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
320 child->exit_code = SIGKILL;
321 /* make sure the single step bit is not set. */
322 clear_single_step(child);
323 wake_up_process(child);
327 case PTRACE_SINGLESTEP: { /* set the trap flag. */
329 if (!valid_signal(data))
331 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
332 set_single_step(child);
333 child->exit_code = data;
334 /* give it a chance to run. */
335 wake_up_process(child);
341 ret = ptrace_detach(child, data);
344 case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
346 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
347 unsigned int __user *tmp = (unsigned int __user *)addr;
349 for (i = 0; i < 32; i++) {
350 ret = put_user(*reg, tmp);
359 case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
361 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
362 unsigned int __user *tmp = (unsigned int __user *)addr;
364 for (i = 0; i < 32; i++) {
365 ret = get_user(*reg, tmp);
374 case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
376 unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
377 unsigned int __user *tmp = (unsigned int __user *)addr;
379 flush_fp_to_thread(child);
381 for (i = 0; i < 32; i++) {
382 ret = put_user(*reg, tmp);
391 case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
393 unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
394 unsigned int __user *tmp = (unsigned int __user *)addr;
396 flush_fp_to_thread(child);
398 for (i = 0; i < 32; i++) {
399 ret = get_user(*reg, tmp);
408 case PTRACE_GETEVENTMSG:
409 ret = put_user(child->ptrace_message, (unsigned int __user *) data);
413 ret = ptrace_request(child, request, addr, data);
417 put_task_struct(child);