2 * linux/arch/m68knommu/kernel/ptrace.c
4 * Copyright (C) 1994 by Hamish Macdonald
5 * Taken from linux/kernel/ptrace.c and modified for M680x0.
6 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of
10 * this archive for more details.
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.h>
18 #include <linux/errno.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/config.h>
22 #include <linux/signal.h>
24 #include <asm/uaccess.h>
26 #include <asm/pgtable.h>
27 #include <asm/system.h>
28 #include <asm/processor.h>
31 * does not yet catch signals sent when the child dies.
32 * in exit.c or in signal.c.
35 /* determines which bits in the SR the user has access to. */
36 /* 1 = access 0 = no access */
37 #define SR_MASK 0x001f
39 /* sets the trace bits. */
40 #define TRACE_BITS 0x8000
42 /* Find the stack offset for a register, relative to thread.esp0. */
43 #define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
44 #define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
45 - sizeof(struct switch_stack))
46 /* Mapping from PT_xxx to the stack offset at which the register is
47 saved. Notice that usp has no stack-slot and needs to be treated
48 specially (see get_reg/put_reg below). */
49 static int regoff[] = {
50 PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4),
51 PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0),
52 PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4),
53 SW_REG(a5), SW_REG(a6), PT_REG(d0), -1,
54 PT_REG(orig_d0), PT_REG(sr), PT_REG(pc),
58 * Get contents of register REGNO in task TASK.
60 static inline long get_reg(struct task_struct *task, int regno)
65 addr = &task->thread.usp;
66 else if (regno < sizeof(regoff)/sizeof(regoff[0]))
67 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
74 * Write contents of register REGNO in task TASK.
76 static inline int put_reg(struct task_struct *task, int regno,
82 addr = &task->thread.usp;
83 else if (regno < sizeof(regoff)/sizeof(regoff[0]))
84 addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
92 * Called by kernel/ptrace.c when detaching..
94 * Make sure the single step bit is not set.
96 void ptrace_disable(struct task_struct *child)
99 /* make sure the single step bit is not set. */
100 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
101 put_reg(child, PT_SR, tmp);
104 long arch_ptrace(truct task_struct *child, long request, long addr, long data)
109 /* when I and D space are separate, these will need to be fixed. */
110 case PTRACE_PEEKTEXT: /* read word at location addr. */
111 case PTRACE_PEEKDATA: {
115 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
117 if (copied != sizeof(tmp))
119 ret = put_user(tmp,(unsigned long *) data);
123 /* read the word at location addr in the USER area. */
124 case PTRACE_PEEKUSR: {
128 if ((addr & 3) || addr < 0 ||
129 addr > sizeof(struct user) - 3)
132 tmp = 0; /* Default return condition */
133 addr = addr >> 2; /* temporary hack. */
136 tmp = get_reg(child, addr);
139 } else if (addr >= 21 && addr < 49) {
140 tmp = child->thread.fp[addr - 21];
141 #ifdef CONFIG_M68KFPU_EMU
142 /* Convert internal fpu reg representation
143 * into long double format
145 if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
146 tmp = ((tmp & 0xffff0000) << 15) |
147 ((tmp & 0x0000ffff) << 16);
149 } else if (addr == 49) {
150 tmp = child->mm->start_code;
151 } else if (addr == 50) {
152 tmp = child->mm->start_data;
153 } else if (addr == 51) {
154 tmp = child->mm->end_code;
157 ret = put_user(tmp,(unsigned long *) data);
161 /* when I and D space are separate, this will have to be fixed. */
162 case PTRACE_POKETEXT: /* write the word at location addr. */
163 case PTRACE_POKEDATA:
165 if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
170 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
172 if ((addr & 3) || addr < 0 ||
173 addr > sizeof(struct user) - 3)
176 addr = addr >> 2; /* temporary hack. */
181 data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
184 if (put_reg(child, addr, data))
189 if (addr >= 21 && addr < 48)
191 #ifdef CONFIG_M68KFPU_EMU
192 /* Convert long double format
193 * into internal fpu reg representation
195 if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
196 data = (unsigned long)data << 15;
197 data = (data & 0xffff0000) |
198 ((data & 0x0000ffff) >> 1);
201 child->thread.fp[addr - 21] = data;
206 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
207 case PTRACE_CONT: { /* restart after signal. */
211 if (!valid_signal(data))
213 if (request == PTRACE_SYSCALL)
214 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
216 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
217 child->exit_code = data;
218 /* make sure the single step bit is not set. */
219 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
220 put_reg(child, PT_SR, tmp);
221 wake_up_process(child);
227 * make the child exit. Best I can do is send it a sigkill.
228 * perhaps it should be put in the status that it wants to
235 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
237 child->exit_code = SIGKILL;
238 /* make sure the single step bit is not set. */
239 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
240 put_reg(child, PT_SR, tmp);
241 wake_up_process(child);
245 case PTRACE_SINGLESTEP: { /* set the trap flag. */
249 if (!valid_signal(data))
251 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
252 tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
253 put_reg(child, PT_SR, tmp);
255 child->exit_code = data;
256 /* give it a chance to run. */
257 wake_up_process(child);
262 case PTRACE_DETACH: /* detach a process that was attached. */
263 ret = ptrace_detach(child, data);
266 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
269 for (i = 0; i < 19; i++) {
270 tmp = get_reg(child, i);
273 if (put_user(tmp, (unsigned long *) data)) {
277 data += sizeof(long);
283 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
286 for (i = 0; i < 19; i++) {
287 if (get_user(tmp, (unsigned long *) data)) {
294 tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
296 put_reg(child, i, tmp);
297 data += sizeof(long);
303 #ifdef PTRACE_GETFPREGS
304 case PTRACE_GETFPREGS: { /* Get the child FPU state. */
306 if (copy_to_user((void *)data, &child->thread.fp,
307 sizeof(struct user_m68kfp_struct)))
313 #ifdef PTRACE_SETFPREGS
314 case PTRACE_SETFPREGS: { /* Set the child FPU state. */
316 if (copy_from_user(&child->thread.fp, (void *)data,
317 sizeof(struct user_m68kfp_struct)))
330 asmlinkage void syscall_trace(void)
332 if (!test_thread_flag(TIF_SYSCALL_TRACE))
334 if (!(current->ptrace & PT_PTRACED))
336 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
339 * this isn't the same as continuing with a signal, but it will do
340 * for normal use. strace only continues with a signal if the
341 * stopping signal is not SIGTRAP. -brl
343 if (current->exit_code) {
344 send_sig(current->exit_code, current, 1);
345 current->exit_code = 0;