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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [or32/] [kernel/] [ptrace.c] - Blame information for rev 1782

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/*
 *  linux/arch/m68knommu/kernel/ptrace.c
 *
 *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
 *                      Kenneth Albanowski <kjahds@kjahds.com>,
 *                      The Silver Hammer Group, Ltd.
 *
 *  Based on:
 *
 *  linux/arch/m68k/kernel/ptrace
 *
 *  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 <stddef.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
 
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
 
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.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
 
/* 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[] = {0,0,0,0,0,0};
 
/* change a pid into a task struct. */
static inline struct task_struct * get_task(int pid)
{
        int i;
 
        for (i = 1; i < NR_TASKS; i++) {
                if (task[i] != NULL && (task[i]->pid == pid))
                        return task[i];
        }
        return NULL;
}
 
/*
 * Get contents of register REGNO in task TASK.
 */
static inline long get_reg(struct task_struct *task, int regno)
{
        unsigned long *addr;
/* SIMON */
#if 0
        if (regno == PT_USP)
                addr = &task->tss.usp;
        else if (regno < sizeof(regoff)/sizeof(regoff[0]))
                addr = (unsigned long *)(task->tss.esp0 + regoff[regno]);
        else
                return 0;
#endif
        return *addr;
}
 
/*
 * Write contents of register REGNO in task TASK.
 */
static inline int put_reg(struct task_struct *task, int regno,
                          unsigned long data)
{
/* SIMON */
#if 0
        unsigned long *addr;
        if (regno == PT_USP)
                addr = &task->tss.usp;
        else if (regno < sizeof(regoff)/sizeof(regoff[0]))
                addr = (unsigned long *) (task->tss.esp0 + regoff[regno]);
        else
                return -1;
        *addr = data;
#endif
        return 0;
}
 
inline
static unsigned long get_long(struct task_struct * tsk,
        struct vm_area_struct * vma, unsigned long addr)
{
        return *(unsigned long*)addr;
}
 
inline
static void put_long(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long addr,
        unsigned long data)
{
        *(unsigned long*)addr = data;
}
 
 
inline
static int read_long(struct task_struct * tsk, unsigned long addr,
        unsigned long * result)
{
        *result = *(unsigned long *)addr;
        return 0;
}
 
inline
static int write_long(struct task_struct * tsk, unsigned long addr,
        unsigned long data)
{
        *(unsigned long *)addr = data;
        return 0;
}
 
asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
{
/* SIMON */
#if 0
        struct task_struct *child;
        struct user * dummy;
        dummy = NULL;
 
        if (request == PTRACE_TRACEME) {
                /* are we already being traced? */
                if (current->flags & PF_PTRACED)
                        return -EPERM;
                /* set the ptrace bit in the process flags. */
                current->flags |= PF_PTRACED;
                return 0;
        }
        if (pid == 1)           /* you may not mess with init */
                return -EPERM;
        if (!(child = get_task(pid)))
                return -ESRCH;
        if (request == PTRACE_ATTACH) {
                if (child == current)
                        return -EPERM;
                if ((!child->dumpable ||
                    (current->uid != child->euid) ||
                    (current->uid != child->suid) ||
                    (current->uid != child->uid) ||
                    (current->gid != child->egid) ||
                    (current->gid != child->sgid) ||
                    (current->gid != child->gid)) && !suser())
                        return -EPERM;
                /* the same process cannot be attached many times */
                if (child->flags & PF_PTRACED)
                        return -EPERM;
                child->flags |= PF_PTRACED;
                if (child->p_pptr != current) {
                        REMOVE_LINKS(child);
                        child->p_pptr = current;
                        SET_LINKS(child);
                }
                send_sig(SIGSTOP, child, 1);
                return 0;
        }
        if (!(child->flags & PF_PTRACED))
                return -ESRCH;
        if (child->state != TASK_STOPPED) {
                if (request != PTRACE_KILL)
                        return -ESRCH;
        }
        if (child->p_pptr != current)
                return -ESRCH;
 
        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 res;
 
                        res = read_long(child, addr, &tmp);
                        if (res < 0)
                                return res;
                        res = verify_area(VERIFY_WRITE, (void *) data, sizeof(long));
                        if (!res)
                                put_user(tmp, (unsigned long *) data);
                        return res;
                }
 
        /* read the word at location addr in the USER area. */
                case PTRACE_PEEKUSR: {
                        unsigned long tmp;
                        int res;
 
                        if ((addr & 3) || addr < 0 || addr >= sizeof(struct user))
                                return -EIO;
 
                        res = verify_area(VERIFY_WRITE, (void *) data,
                                          sizeof(long));
                        if (res)
                                return res;
                        tmp = 0;  /* Default return condition */
                        addr = addr >> 2; /* temporary hack. */
                        if (addr < 19) {
                                tmp = get_reg(child, addr);
                                if (addr == PT_SR)
                                        tmp >>= 16;
                        }
                        else if (addr >= 21 && addr < 49)
                                tmp = child->tss.fp[addr - 21];
                        else if (addr == 49)
                                tmp = child->mm->start_code;
                        else if (addr == 50)
                                tmp = child->mm->start_data;
                        else
                                return -EIO;
                        put_user(tmp,(unsigned long *) data);
                        return 0;
                }
 
      /* 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:
                        return write_long(child,addr,data);
 
                case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
                        if ((addr & 3) || addr < 0 || addr >= sizeof(struct user))
                                return -EIO;
 
                        addr = addr >> 2; /* temporary hack. */
 
                        if (addr == PT_ORIG_D0)
                                return -EIO;
                        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))
                                        return -EIO;
                                return 0;
                        }
                        if (addr >= 21 && addr < 48)
                        {
                                child->tss.fp[addr - 21] = data;
                                return 0;
                        }
                        return -EIO;
 
                case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
                case PTRACE_CONT: { /* restart after signal. */
                        long tmp;
 
                        if ((unsigned long) data >= NSIG)
                                return -EIO;
                        if (request == PTRACE_SYSCALL)
                                child->flags |= PF_TRACESYS;
                        else
                                child->flags &= ~PF_TRACESYS;
                        child->exit_code = data;
                        wake_up_process(child);
                        /* make sure the single step bit is not set. */
                        tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
                        put_reg(child, PT_SR, tmp);
                        return 0;
                }
 
/*
 * 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;
 
                        if (child->state == TASK_ZOMBIE) /* already dead */
                                return 0;
                        wake_up_process(child);
                        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);
                        return 0;
                }
 
                case PTRACE_SINGLESTEP: {  /* set the trap flag. */
                        long tmp;
 
                        if ((unsigned long) data >= NSIG)
                                return -EIO;
                        child->flags &= ~PF_TRACESYS;
                        tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
                        put_reg(child, PT_SR, tmp);
 
                        wake_up_process(child);
                        child->exit_code = data;
        /* give it a chance to run. */
                        return 0;
                }
 
                case PTRACE_DETACH: { /* detach a process that was attached. */
                        long tmp;
 
                        if ((unsigned long) data >= NSIG)
                                return -EIO;
                        child->flags &= ~(PF_PTRACED|PF_TRACESYS);
                        wake_up_process(child);
                        child->exit_code = data;
                        REMOVE_LINKS(child);
                        child->p_pptr = child->p_opptr;
                        SET_LINKS(child);
                        /* make sure the single step bit is not set. */
                        tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
                        put_reg(child, PT_SR, tmp);
                        return 0;
                }
 
                default:
                        return -EIO;
        }
#endif
        return 0;
}
 
asmlinkage void syscall_trace(void)
{
        if ((current->flags & (PF_PTRACED|PF_TRACESYS))
                        != (PF_PTRACED|PF_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)
                current->signal |= (1 << (current->exit_code - 1));
        current->exit_code = 0;
        return;
}

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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [or32/] [kernel/] [ptrace.c] - Blame information for rev 1782

Line No.	Rev	Author	Line
1	1624	jcastillo	`/*`
2			`* linux/arch/m68knommu/kernel/ptrace.c`
3			`*`
4			`* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,`
5			`* Kenneth Albanowski <kjahds@kjahds.com>,`
6			`* The Silver Hammer Group, Ltd.`
7			`*`
8			`* Based on:`
9			`*`
10			`* linux/arch/m68k/kernel/ptrace`
11			`*`
12			`* Copyright (C) 1994 by Hamish Macdonald`
13			`* Taken from linux/kernel/ptrace.c and modified for M680x0.`
14			`* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds`
15			`*`
16			`* This file is subject to the terms and conditions of the GNU General`
17			`* Public License. See the file COPYING in the main directory of`
18			`* this archive for more details.`
19			`*/`
20
21			`#include <stddef.h>`
22			`#include <linux/kernel.h>`
23			`#include <linux/sched.h>`
24			`#include <linux/string.h>`
25
26			`#include <linux/mm.h>`
27			`#include <linux/errno.h>`
28			`#include <linux/ptrace.h>`
29			`#include <linux/user.h>`
30
31			`#include <asm/segment.h>`
32			`#include <asm/page.h>`
33			`#include <asm/pgtable.h>`
34			`#include <asm/system.h>`
35
36			`/*`
37			`* does not yet catch signals sent when the child dies.`
38			`* in exit.c or in signal.c.`
39			`*/`
40
41			`/* determines which bits in the SR the user has access to. */`
42			`/* 1 = access 0 = no access */`
43			`#define SR_MASK 0x001f`
44
45			`/* sets the trace bits. */`
46			`#define TRACE_BITS 0x8000`
47
48			`/* Mapping from PT_xxx to the stack offset at which the register is`
49			`saved. Notice that usp has no stack-slot and needs to be treated`
50			`specially (see get_reg/put_reg below). */`
51			`static int regoff[] = {0,0,0,0,0,0};`
52
53			`/* change a pid into a task struct. */`
54			`static inline struct task_struct * get_task(int pid)`
55			`{`
56			`int i;`
57
58			`for (i = 1; i < NR_TASKS; i++) {`
59			`if (task[i] != NULL && (task[i]->pid == pid))`
60			`return task[i];`
61			`}`
62			`return NULL;`
63			`}`
64
65			`/*`
66			`* Get contents of register REGNO in task TASK.`
67			`*/`
68			`static inline long get_reg(struct task_struct *task, int regno)`
69			`{`
70			`unsigned long *addr;`
71			`/* SIMON */`
72			`#if 0`
73			`if (regno == PT_USP)`
74			`addr = &task->tss.usp;`
75			`else if (regno < sizeof(regoff)/sizeof(regoff[0]))`
76			`addr = (unsigned long *)(task->tss.esp0 + regoff[regno]);`
77			`else`
78			`return 0;`
79			`#endif`
80			`return *addr;`
81			`}`
82
83			`/*`
84			`* Write contents of register REGNO in task TASK.`
85			`*/`
86			`static inline int put_reg(struct task_struct *task, int regno,`
87			`unsigned long data)`
88			`{`
89			`/* SIMON */`
90			`#if 0`
91			`unsigned long *addr;`
92			`if (regno == PT_USP)`
93			`addr = &task->tss.usp;`
94			`else if (regno < sizeof(regoff)/sizeof(regoff[0]))`
95			`addr = (unsigned long *) (task->tss.esp0 + regoff[regno]);`
96			`else`
97			`return -1;`
98			`*addr = data;`
99			`#endif`
100			`return 0;`
101			`}`
102
103			`inline`
104			`static unsigned long get_long(struct task_struct * tsk,`
105			`struct vm_area_struct * vma, unsigned long addr)`
106			`{`
107			`return (unsigned long)addr;`
108			`}`
109
110			`inline`
111			`static void put_long(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long addr,`
112			`unsigned long data)`
113			`{`
114			`(unsigned long)addr = data;`
115			`}`
116
117
118			`inline`
119			`static int read_long(struct task_struct * tsk, unsigned long addr,`
120			`unsigned long * result)`
121			`{`
122			`result = (unsigned long *)addr;`
123			`return 0;`
124			`}`
125
126			`inline`
127			`static int write_long(struct task_struct * tsk, unsigned long addr,`
128			`unsigned long data)`
129			`{`
130			`(unsigned long )addr = data;`
131			`return 0;`
132			`}`
133
134			`asmlinkage int sys_ptrace(long request, long pid, long addr, long data)`
135			`{`
136			`/* SIMON */`
137			`#if 0`
138			`struct task_struct *child;`
139			`struct user * dummy;`
140			`dummy = NULL;`
141
142			`if (request == PTRACE_TRACEME) {`
143			`/* are we already being traced? */`
144			`if (current->flags & PF_PTRACED)`
145			`return -EPERM;`
146			`/* set the ptrace bit in the process flags. */`
147			`current->flags \|= PF_PTRACED;`
148			`return 0;`
149			`}`
150			`if (pid == 1) /* you may not mess with init */`
151			`return -EPERM;`
152			`if (!(child = get_task(pid)))`
153			`return -ESRCH;`
154			`if (request == PTRACE_ATTACH) {`
155			`if (child == current)`
156			`return -EPERM;`
157			`if ((!child->dumpable \|\|`
158			`(current->uid != child->euid) \|\|`
159			`(current->uid != child->suid) \|\|`
160			`(current->uid != child->uid) \|\|`
161			`(current->gid != child->egid) \|\|`
162			`(current->gid != child->sgid) \|\|`
163			`(current->gid != child->gid)) && !suser())`
164			`return -EPERM;`
165			`/* the same process cannot be attached many times */`
166			`if (child->flags & PF_PTRACED)`
167			`return -EPERM;`
168			`child->flags \|= PF_PTRACED;`
169			`if (child->p_pptr != current) {`
170			`REMOVE_LINKS(child);`
171			`child->p_pptr = current;`
172			`SET_LINKS(child);`
173			`}`
174			`send_sig(SIGSTOP, child, 1);`
175			`return 0;`
176			`}`
177			`if (!(child->flags & PF_PTRACED))`
178			`return -ESRCH;`
179			`if (child->state != TASK_STOPPED) {`
180			`if (request != PTRACE_KILL)`
181			`return -ESRCH;`
182			`}`
183			`if (child->p_pptr != current)`
184			`return -ESRCH;`
185
186			`switch (request) {`
187			`/* when I and D space are separate, these will need to be fixed. */`
188			`case PTRACE_PEEKTEXT: /* read word at location addr. */`
189			`case PTRACE_PEEKDATA: {`
190			`unsigned long tmp;`
191			`int res;`
192
193			`res = read_long(child, addr, &tmp);`
194			`if (res < 0)`
195			`return res;`
196			`res = verify_area(VERIFY_WRITE, (void *) data, sizeof(long));`
197			`if (!res)`
198			`put_user(tmp, (unsigned long *) data);`
199			`return res;`
200			`}`
201
202			`/* read the word at location addr in the USER area. */`
203			`case PTRACE_PEEKUSR: {`
204			`unsigned long tmp;`
205			`int res;`
206
207			`if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user))`
208			`return -EIO;`
209
210			`res = verify_area(VERIFY_WRITE, (void *) data,`
211			`sizeof(long));`
212			`if (res)`
213			`return res;`
214			`tmp = 0; /* Default return condition */`
215			`addr = addr >> 2; /* temporary hack. */`
216			`if (addr < 19) {`
217			`tmp = get_reg(child, addr);`
218			`if (addr == PT_SR)`
219			`tmp >>= 16;`
220			`}`
221			`else if (addr >= 21 && addr < 49)`
222			`tmp = child->tss.fp[addr - 21];`
223			`else if (addr == 49)`
224			`tmp = child->mm->start_code;`
225			`else if (addr == 50)`
226			`tmp = child->mm->start_data;`
227			`else`
228			`return -EIO;`
229			`put_user(tmp,(unsigned long *) data);`
230			`return 0;`
231			`}`
232
233			`/* when I and D space are separate, this will have to be fixed. */`
234			`case PTRACE_POKETEXT: /* write the word at location addr. */`
235			`case PTRACE_POKEDATA:`
236			`return write_long(child,addr,data);`
237
238			`case PTRACE_POKEUSR: /* write the word at location addr in the USER area */`
239			`if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user))`
240			`return -EIO;`
241
242			`addr = addr >> 2; /* temporary hack. */`
243
244			`if (addr == PT_ORIG_D0)`
245			`return -EIO;`
246			`if (addr == PT_SR) {`
247			`data &= SR_MASK;`
248			`data <<= 16;`
249			`data \|= get_reg(child, PT_SR) & ~(SR_MASK << 16);`
250			`}`
251			`if (addr < 19) {`
252			`if (put_reg(child, addr, data))`
253			`return -EIO;`
254			`return 0;`
255			`}`
256			`if (addr >= 21 && addr < 48)`
257			`{`
258			`child->tss.fp[addr - 21] = data;`
259			`return 0;`
260			`}`
261			`return -EIO;`
262
263			`case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */`
264			`case PTRACE_CONT: { /* restart after signal. */`
265			`long tmp;`
266
267			`if ((unsigned long) data >= NSIG)`
268			`return -EIO;`
269			`if (request == PTRACE_SYSCALL)`
270			`child->flags \|= PF_TRACESYS;`
271			`else`
272			`child->flags &= ~PF_TRACESYS;`
273			`child->exit_code = data;`
274			`wake_up_process(child);`
275			`/* make sure the single step bit is not set. */`
276			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
277			`put_reg(child, PT_SR, tmp);`
278			`return 0;`
279			`}`
280
281			`/*`
282			`* make the child exit. Best I can do is send it a sigkill.`
283			`* perhaps it should be put in the status that it wants to`
284			`* exit.`
285			`*/`
286			`case PTRACE_KILL: {`
287			`long tmp;`
288
289			`if (child->state == TASK_ZOMBIE) /* already dead */`
290			`return 0;`
291			`wake_up_process(child);`
292			`child->exit_code = SIGKILL;`
293			`/* make sure the single step bit is not set. */`
294			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
295			`put_reg(child, PT_SR, tmp);`
296			`return 0;`
297			`}`
298
299			`case PTRACE_SINGLESTEP: { /* set the trap flag. */`
300			`long tmp;`
301
302			`if ((unsigned long) data >= NSIG)`
303			`return -EIO;`
304			`child->flags &= ~PF_TRACESYS;`
305			`tmp = get_reg(child, PT_SR) \| (TRACE_BITS << 16);`
306			`put_reg(child, PT_SR, tmp);`
307
308			`wake_up_process(child);`
309			`child->exit_code = data;`
310			`/* give it a chance to run. */`
311			`return 0;`
312			`}`
313
314			`case PTRACE_DETACH: { /* detach a process that was attached. */`
315			`long tmp;`
316
317			`if ((unsigned long) data >= NSIG)`
318			`return -EIO;`
319			`child->flags &= ~(PF_PTRACED\|PF_TRACESYS);`
320			`wake_up_process(child);`
321			`child->exit_code = data;`
322			`REMOVE_LINKS(child);`
323			`child->p_pptr = child->p_opptr;`
324			`SET_LINKS(child);`
325			`/* make sure the single step bit is not set. */`
326			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
327			`put_reg(child, PT_SR, tmp);`
328			`return 0;`
329			`}`
330
331			`default:`
332			`return -EIO;`
333			`}`
334			`#endif`
335			`return 0;`
336			`}`
337
338			`asmlinkage void syscall_trace(void)`
339			`{`
340			`if ((current->flags & (PF_PTRACED\|PF_TRACESYS))`
341			`!= (PF_PTRACED\|PF_TRACESYS))`
342			`return;`
343			`current->exit_code = SIGTRAP;`
344			`current->state = TASK_STOPPED;`
345			`notify_parent(current, SIGCHLD);`
346			`schedule();`
347			`/*`
348			`* this isn't the same as continuing with a signal, but it will do`
349			`* for normal use. strace only continues with a signal if the`
350			`* stopping signal is not SIGTRAP. -brl`
351			`*/`
352			`if (current->exit_code)`
353			`current->signal \|= (1 << (current->exit_code - 1));`
354			`current->exit_code = 0;`
355			`return;`
356			`}`