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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [m68k/] [kernel/] [ptrace.c] - Blame information for rev 1765

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/*
 *  linux/arch/m68k/kernel/ptrace.c
 *
 *  Copyright (C) 1994 by Hamish Macdonald
 *  Taken from linux/kernel/ptrace.c and modified for M680x0.
 *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file COPYING in the main directory of
 * this archive for more details.
 */
 
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/config.h>
 
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
 
/*
 * does not yet catch signals sent when the child dies.
 * in exit.c or in signal.c.
 */
 
/* determines which bits in the SR the user has access to. */
/* 1 = access 0 = no access */
#define SR_MASK 0x001f
 
/* sets the trace bits. */
#define TRACE_BITS 0x8000
 
/* Find the stack offset for a register, relative to thread.esp0. */
#define PT_REG(reg)     ((long)&((struct pt_regs *)0)->reg)
#define SW_REG(reg)     ((long)&((struct switch_stack *)0)->reg \
                         - sizeof(struct switch_stack))
/* Mapping from PT_xxx to the stack offset at which the register is
   saved.  Notice that usp has no stack-slot and needs to be treated
   specially (see get_reg/put_reg below). */
static int regoff[] = {
        PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4),
        PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0),
        PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4),
        SW_REG(a5), SW_REG(a6), PT_REG(d0), -1,
        PT_REG(orig_d0), PT_REG(sr), PT_REG(pc),
};
 
/*
 * Get contents of register REGNO in task TASK.
 */
static inline long get_reg(struct task_struct *task, int regno)
{
        unsigned long *addr;
 
        if (regno == PT_USP)
                addr = &task->thread.usp;
        else if (regno < sizeof(regoff)/sizeof(regoff[0]))
                addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
        else
                return 0;
        return *addr;
}
 
/*
 * Write contents of register REGNO in task TASK.
 */
static inline int put_reg(struct task_struct *task, int regno,
                          unsigned long data)
{
        unsigned long *addr;
 
        if (regno == PT_USP)
                addr = &task->thread.usp;
        else if (regno < sizeof(regoff)/sizeof(regoff[0]))
                addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
        else
                return -1;
        *addr = data;
        return 0;
}
 
/*
 * Called by kernel/ptrace.c when detaching..
 *
 * Make sure the single step bit is not set.
 */
void ptrace_disable(struct task_struct *child)
{
        unsigned long tmp;
        /* make sure the single step bit is not set. */
        tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
        put_reg(child, PT_SR, tmp);
}
 
asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
{
        struct task_struct *child;
        int ret;
 
        lock_kernel();
        ret = -EPERM;
        if (request == PTRACE_TRACEME) {
                /* are we already being traced? */
                if (current->ptrace & PT_PTRACED)
                        goto out;
                /* set the ptrace bit in the process flags. */
                current->ptrace |= PT_PTRACED;
                ret = 0;
                goto out;
        }
        ret = -ESRCH;
        read_lock(&tasklist_lock);
        child = find_task_by_pid(pid);
        if (child)
                get_task_struct(child);
        read_unlock(&tasklist_lock);
        if (!child)
                goto out;
 
        ret = -EPERM;
        if (pid == 1)           /* you may not mess with init */
                goto out_tsk;
 
        if (request == PTRACE_ATTACH) {
                ret = ptrace_attach(child);
                goto out_tsk;
        }
 
        ret = ptrace_check_attach(child, request == PTRACE_KILL);
        if (ret < 0)
                goto out_tsk;
 
        switch (request) {
        /* when I and D space are separate, these will need to be fixed. */
                case PTRACE_PEEKTEXT: /* read word at location addr. */
                case PTRACE_PEEKDATA: {
                        unsigned long tmp;
                        int copied;
 
                        copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
                        ret = -EIO;
                        if (copied != sizeof(tmp))
                                break;
                        ret = put_user(tmp,(unsigned long *) data);
                        break;
                }
 
        /* read the word at location addr in the USER area. */
                case PTRACE_PEEKUSR: {
                        unsigned long tmp;
 
                        ret = -EIO;
                        if ((addr & 3) || addr < 0 ||
                            addr > sizeof(struct user) - 3)
                                break;
 
                        tmp = 0;  /* Default return condition */
                        addr = addr >> 2; /* temporary hack. */
                        ret = -EIO;
                        if (addr < 19) {
                                tmp = get_reg(child, addr);
                                if (addr == PT_SR)
                                        tmp >>= 16;
                        } else if (addr >= 21 && addr < 49) {
                                tmp = child->thread.fp[addr - 21];
#ifdef CONFIG_M68KFPU_EMU
                                /* Convert internal fpu reg representation
                                 * into long double format
                                 */
                                if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
                                        tmp = ((tmp & 0xffff0000) << 15) |
                                              ((tmp & 0x0000ffff) << 16);
#endif
                        } else
                                break;
                        ret = put_user(tmp,(unsigned long *) data);
                        break;
                }
 
      /* when I and D space are separate, this will have to be fixed. */
                case PTRACE_POKETEXT: /* write the word at location addr. */
                case PTRACE_POKEDATA:
                        ret = 0;
                        if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
                                break;
                        ret = -EIO;
                        break;
 
                case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
                        ret = -EIO;
                        if ((addr & 3) || addr < 0 ||
                            addr > sizeof(struct user) - 3)
                                break;
 
                        addr = addr >> 2; /* temporary hack. */
 
                        if (addr == PT_SR) {
                                data &= SR_MASK;
                                data <<= 16;
                                data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
                        }
                        if (addr < 19) {
                                if (put_reg(child, addr, data))
                                        break;
                                ret = 0;
                                break;
                        }
                        if (addr >= 21 && addr < 48)
                        {
#ifdef CONFIG_M68KFPU_EMU
                                /* Convert long double format
                                 * into internal fpu reg representation
                                 */
                                if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
                                        data = (unsigned long)data << 15;
                                        data = (data & 0xffff0000) |
                                               ((data & 0x0000ffff) >> 1);
                                }
#endif
                                child->thread.fp[addr - 21] = data;
                                ret = 0;
                        }
                        break;
 
                case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
                case PTRACE_CONT: { /* restart after signal. */
                        long tmp;
 
                        ret = -EIO;
                        if ((unsigned long) data > _NSIG)
                                break;
                        if (request == PTRACE_SYSCALL)
                                child->ptrace |= PT_TRACESYS;
                        else
                                child->ptrace &= ~PT_TRACESYS;
                        child->exit_code = data;
                        /* make sure the single step bit is not set. */
                        tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
                        put_reg(child, PT_SR, tmp);
                        wake_up_process(child);
                        ret = 0;
                        break;
                }
 
/*
 * make the child exit.  Best I can do is send it a sigkill.
 * perhaps it should be put in the status that it wants to
 * exit.
 */
                case PTRACE_KILL: {
                        long tmp;
 
                        ret = 0;
                        if (child->state == TASK_ZOMBIE) /* already dead */
                                break;
                        child->exit_code = SIGKILL;
        /* make sure the single step bit is not set. */
                        tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
                        put_reg(child, PT_SR, tmp);
                        wake_up_process(child);
                        break;
                }
 
                case PTRACE_SINGLESTEP: {  /* set the trap flag. */
                        long tmp;
 
                        ret = -EIO;
                        if ((unsigned long) data > _NSIG)
                                break;
                        child->ptrace &= ~PT_TRACESYS;
                        tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
                        put_reg(child, PT_SR, tmp);
 
                        child->exit_code = data;
        /* give it a chance to run. */
                        wake_up_process(child);
                        ret = 0;
                        break;
                }
 
                case PTRACE_DETACH:     /* detach a process that was attached. */
                        ret = ptrace_detach(child, data);
                        break;
 
                case PTRACE_GETREGS: { /* Get all gp regs from the child. */
                        int i;
                        unsigned long tmp;
                        for (i = 0; i < 19; i++) {
                            tmp = get_reg(child, i);
                            if (i == PT_SR)
                                tmp >>= 16;
                            if (put_user(tmp, (unsigned long *) data)) {
                                ret = -EFAULT;
                                break;
                            }
                            data += sizeof(long);
                        }
                        ret = 0;
                        break;
                }
 
                case PTRACE_SETREGS: { /* Set all gp regs in the child. */
                        int i;
                        unsigned long tmp;
                        for (i = 0; i < 19; i++) {
                            if (get_user(tmp, (unsigned long *) data)) {
                                ret = -EFAULT;
                                break;
                            }
                            if (i == PT_SR) {
                                tmp &= SR_MASK;
                                tmp <<= 16;
                                tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
                            }
                            put_reg(child, i, tmp);
                            data += sizeof(long);
                        }
                        ret = 0;
                        break;
                }
 
                case PTRACE_GETFPREGS: { /* Get the child FPU state. */
                        ret = 0;
                        if (copy_to_user((void *)data, &child->thread.fp,
                                         sizeof(struct user_m68kfp_struct)))
                                ret = -EFAULT;
                        break;
                }
 
                case PTRACE_SETFPREGS: { /* Set the child FPU state. */
                        ret = 0;
                        if (copy_from_user(&child->thread.fp, (void *)data,
                                           sizeof(struct user_m68kfp_struct)))
                                ret = -EFAULT;
                        break;
                }
 
                default:
                        ret = -EIO;
                        break;
        }
out_tsk:
        free_task_struct(child);
out:
        unlock_kernel();
        return ret;
}
 
asmlinkage void syscall_trace(void)
{
        if ((current->ptrace & (PT_PTRACED|PT_TRACESYS))
                        != (PT_PTRACED|PT_TRACESYS))
                return;
        current->exit_code = SIGTRAP;
        current->state = TASK_STOPPED;
        notify_parent(current, SIGCHLD);
        schedule();
        /*
         * this isn't the same as continuing with a signal, but it will do
         * for normal use.  strace only continues with a signal if the
         * stopping signal is not SIGTRAP.  -brl
         */
        if (current->exit_code) {
                send_sig(current->exit_code, current, 1);
                current->exit_code = 0;
        }
}

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [m68k/] [kernel/] [ptrace.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/arch/m68k/kernel/ptrace.c`
3			`*`
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`
7			`*`
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.`
11			`*/`
12
13			`#include <linux/kernel.h>`
14			`#include <linux/sched.h>`
15			`#include <linux/mm.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
23			`#include <asm/uaccess.h>`
24			`#include <asm/page.h>`
25			`#include <asm/pgtable.h>`
26			`#include <asm/system.h>`
27			`#include <asm/processor.h>`
28
29			`/*`
30			`* does not yet catch signals sent when the child dies.`
31			`* in exit.c or in signal.c.`
32			`*/`
33
34			`/* determines which bits in the SR the user has access to. */`
35			`/* 1 = access 0 = no access */`
36			`#define SR_MASK 0x001f`
37
38			`/* sets the trace bits. */`
39			`#define TRACE_BITS 0x8000`
40
41			`/* Find the stack offset for a register, relative to thread.esp0. */`
42			`#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)`
43			`#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \`
44			`- sizeof(struct switch_stack))`
45			`/* Mapping from PT_xxx to the stack offset at which the register is`
46			`saved. Notice that usp has no stack-slot and needs to be treated`
47			`specially (see get_reg/put_reg below). */`
48			`static int regoff[] = {`
49			`PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4),`
50			`PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0),`
51			`PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4),`
52			`SW_REG(a5), SW_REG(a6), PT_REG(d0), -1,`
53			`PT_REG(orig_d0), PT_REG(sr), PT_REG(pc),`
54			`};`
55
56			`/*`
57			`* Get contents of register REGNO in task TASK.`
58			`*/`
59			`static inline long get_reg(struct task_struct *task, int regno)`
60			`{`
61			`unsigned long *addr;`
62
63			`if (regno == PT_USP)`
64			`addr = &task->thread.usp;`
65			`else if (regno < sizeof(regoff)/sizeof(regoff[0]))`
66			`addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);`
67			`else`
68			`return 0;`
69			`return *addr;`
70			`}`
71
72			`/*`
73			`* Write contents of register REGNO in task TASK.`
74			`*/`
75			`static inline int put_reg(struct task_struct *task, int regno,`
76			`unsigned long data)`
77			`{`
78			`unsigned long *addr;`
79
80			`if (regno == PT_USP)`
81			`addr = &task->thread.usp;`
82			`else if (regno < sizeof(regoff)/sizeof(regoff[0]))`
83			`addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);`
84			`else`
85			`return -1;`
86			`*addr = data;`
87			`return 0;`
88			`}`
89
90			`/*`
91			`* Called by kernel/ptrace.c when detaching..`
92			`*`
93			`* Make sure the single step bit is not set.`
94			`*/`
95			`void ptrace_disable(struct task_struct *child)`
96			`{`
97			`unsigned long tmp;`
98			`/* make sure the single step bit is not set. */`
99			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
100			`put_reg(child, PT_SR, tmp);`
101			`}`
102
103			`asmlinkage int sys_ptrace(long request, long pid, long addr, long data)`
104			`{`
105			`struct task_struct *child;`
106			`int ret;`
107
108			`lock_kernel();`
109			`ret = -EPERM;`
110			`if (request == PTRACE_TRACEME) {`
111			`/* are we already being traced? */`
112			`if (current->ptrace & PT_PTRACED)`
113			`goto out;`
114			`/* set the ptrace bit in the process flags. */`
115			`current->ptrace \|= PT_PTRACED;`
116			`ret = 0;`
117			`goto out;`
118			`}`
119			`ret = -ESRCH;`
120			`read_lock(&tasklist_lock);`
121			`child = find_task_by_pid(pid);`
122			`if (child)`
123			`get_task_struct(child);`
124			`read_unlock(&tasklist_lock);`
125			`if (!child)`
126			`goto out;`
127
128			`ret = -EPERM;`
129			`if (pid == 1) /* you may not mess with init */`
130			`goto out_tsk;`
131
132			`if (request == PTRACE_ATTACH) {`
133			`ret = ptrace_attach(child);`
134			`goto out_tsk;`
135			`}`
136
137			`ret = ptrace_check_attach(child, request == PTRACE_KILL);`
138			`if (ret < 0)`
139			`goto out_tsk;`
140
141			`switch (request) {`
142			`/* when I and D space are separate, these will need to be fixed. */`
143			`case PTRACE_PEEKTEXT: /* read word at location addr. */`
144			`case PTRACE_PEEKDATA: {`
145			`unsigned long tmp;`
146			`int copied;`
147
148			`copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);`
149			`ret = -EIO;`
150			`if (copied != sizeof(tmp))`
151			`break;`
152			`ret = put_user(tmp,(unsigned long *) data);`
153			`break;`
154			`}`
155
156			`/* read the word at location addr in the USER area. */`
157			`case PTRACE_PEEKUSR: {`
158			`unsigned long tmp;`
159
160			`ret = -EIO;`
161			`if ((addr & 3) \|\| addr < 0 \|\|`
162			`addr > sizeof(struct user) - 3)`
163			`break;`
164
165			`tmp = 0; /* Default return condition */`
166			`addr = addr >> 2; /* temporary hack. */`
167			`ret = -EIO;`
168			`if (addr < 19) {`
169			`tmp = get_reg(child, addr);`
170			`if (addr == PT_SR)`
171			`tmp >>= 16;`
172			`} else if (addr >= 21 && addr < 49) {`
173			`tmp = child->thread.fp[addr - 21];`
174			`#ifdef CONFIG_M68KFPU_EMU`
175			`/* Convert internal fpu reg representation`
176			`* into long double format`
177			`*/`
178			`if (FPU_IS_EMU && (addr < 45) && !(addr % 3))`
179			`tmp = ((tmp & 0xffff0000) << 15) \|`
180			`((tmp & 0x0000ffff) << 16);`
181			`#endif`
182			`} else`
183			`break;`
184			`ret = put_user(tmp,(unsigned long *) data);`
185			`break;`
186			`}`
187
188			`/* when I and D space are separate, this will have to be fixed. */`
189			`case PTRACE_POKETEXT: /* write the word at location addr. */`
190			`case PTRACE_POKEDATA:`
191			`ret = 0;`
192			`if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))`
193			`break;`
194			`ret = -EIO;`
195			`break;`
196
197			`case PTRACE_POKEUSR: /* write the word at location addr in the USER area */`
198			`ret = -EIO;`
199			`if ((addr & 3) \|\| addr < 0 \|\|`
200			`addr > sizeof(struct user) - 3)`
201			`break;`
202
203			`addr = addr >> 2; /* temporary hack. */`
204
205			`if (addr == PT_SR) {`
206			`data &= SR_MASK;`
207			`data <<= 16;`
208			`data \|= get_reg(child, PT_SR) & ~(SR_MASK << 16);`
209			`}`
210			`if (addr < 19) {`
211			`if (put_reg(child, addr, data))`
212			`break;`
213			`ret = 0;`
214			`break;`
215			`}`
216			`if (addr >= 21 && addr < 48)`
217			`{`
218			`#ifdef CONFIG_M68KFPU_EMU`
219			`/* Convert long double format`
220			`* into internal fpu reg representation`
221			`*/`
222			`if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {`
223			`data = (unsigned long)data << 15;`
224			`data = (data & 0xffff0000) \|`
225			`((data & 0x0000ffff) >> 1);`
226			`}`
227			`#endif`
228			`child->thread.fp[addr - 21] = data;`
229			`ret = 0;`
230			`}`
231			`break;`
232
233			`case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */`
234			`case PTRACE_CONT: { /* restart after signal. */`
235			`long tmp;`
236
237			`ret = -EIO;`
238			`if ((unsigned long) data > _NSIG)`
239			`break;`
240			`if (request == PTRACE_SYSCALL)`
241			`child->ptrace \|= PT_TRACESYS;`
242			`else`
243			`child->ptrace &= ~PT_TRACESYS;`
244			`child->exit_code = data;`
245			`/* make sure the single step bit is not set. */`
246			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
247			`put_reg(child, PT_SR, tmp);`
248			`wake_up_process(child);`
249			`ret = 0;`
250			`break;`
251			`}`
252
253			`/*`
254			`* make the child exit. Best I can do is send it a sigkill.`
255			`* perhaps it should be put in the status that it wants to`
256			`* exit.`
257			`*/`
258			`case PTRACE_KILL: {`
259			`long tmp;`
260
261			`ret = 0;`
262			`if (child->state == TASK_ZOMBIE) /* already dead */`
263			`break;`
264			`child->exit_code = SIGKILL;`
265			`/* make sure the single step bit is not set. */`
266			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
267			`put_reg(child, PT_SR, tmp);`
268			`wake_up_process(child);`
269			`break;`
270			`}`
271
272			`case PTRACE_SINGLESTEP: { /* set the trap flag. */`
273			`long tmp;`
274
275			`ret = -EIO;`
276			`if ((unsigned long) data > _NSIG)`
277			`break;`
278			`child->ptrace &= ~PT_TRACESYS;`
279			`tmp = get_reg(child, PT_SR) \| (TRACE_BITS << 16);`
280			`put_reg(child, PT_SR, tmp);`
281
282			`child->exit_code = data;`
283			`/* give it a chance to run. */`
284			`wake_up_process(child);`
285			`ret = 0;`
286			`break;`
287			`}`
288
289			`case PTRACE_DETACH: /* detach a process that was attached. */`
290			`ret = ptrace_detach(child, data);`
291			`break;`
292
293			`case PTRACE_GETREGS: { /* Get all gp regs from the child. */`
294			`int i;`
295			`unsigned long tmp;`
296			`for (i = 0; i < 19; i++) {`
297			`tmp = get_reg(child, i);`
298			`if (i == PT_SR)`
299			`tmp >>= 16;`
300			`if (put_user(tmp, (unsigned long *) data)) {`
301			`ret = -EFAULT;`
302			`break;`
303			`}`
304			`data += sizeof(long);`
305			`}`
306			`ret = 0;`
307			`break;`
308			`}`
309
310			`case PTRACE_SETREGS: { /* Set all gp regs in the child. */`
311			`int i;`
312			`unsigned long tmp;`
313			`for (i = 0; i < 19; i++) {`
314			`if (get_user(tmp, (unsigned long *) data)) {`
315			`ret = -EFAULT;`
316			`break;`
317			`}`
318			`if (i == PT_SR) {`
319			`tmp &= SR_MASK;`
320			`tmp <<= 16;`
321			`tmp \|= get_reg(child, PT_SR) & ~(SR_MASK << 16);`
322			`}`
323			`put_reg(child, i, tmp);`
324			`data += sizeof(long);`
325			`}`
326			`ret = 0;`
327			`break;`
328			`}`
329
330			`case PTRACE_GETFPREGS: { /* Get the child FPU state. */`
331			`ret = 0;`
332			`if (copy_to_user((void *)data, &child->thread.fp,`
333			`sizeof(struct user_m68kfp_struct)))`
334			`ret = -EFAULT;`
335			`break;`
336			`}`
337
338			`case PTRACE_SETFPREGS: { /* Set the child FPU state. */`
339			`ret = 0;`
340			`if (copy_from_user(&child->thread.fp, (void *)data,`
341			`sizeof(struct user_m68kfp_struct)))`
342			`ret = -EFAULT;`
343			`break;`
344			`}`
345
346			`default:`
347			`ret = -EIO;`
348			`break;`
349			`}`
350			`out_tsk:`
351			`free_task_struct(child);`
352			`out:`
353			`unlock_kernel();`
354			`return ret;`
355			`}`
356
357			`asmlinkage void syscall_trace(void)`
358			`{`
359			`if ((current->ptrace & (PT_PTRACED\|PT_TRACESYS))`
360			`!= (PT_PTRACED\|PT_TRACESYS))`
361			`return;`
362			`current->exit_code = SIGTRAP;`
363			`current->state = TASK_STOPPED;`
364			`notify_parent(current, SIGCHLD);`
365			`schedule();`
366			`/*`
367			`* this isn't the same as continuing with a signal, but it will do`
368			`* for normal use. strace only continues with a signal if the`
369			`* stopping signal is not SIGTRAP. -brl`
370			`*/`
371			`if (current->exit_code) {`
372			`send_sig(current->exit_code, current, 1);`
373			`current->exit_code = 0;`
374			`}`
375			`}`