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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [or32/] [kernel/] [ptrace.c] - Blame information for rev 666

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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
 
/* Find the stack offset for a register, relative to tss.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[] = {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/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [or32/] [kernel/] [ptrace.c] - Blame information for rev 666

Line No.	Rev	Author	Line
1	666	simons	`/*`
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			`/* Find the stack offset for a register, relative to tss.esp0. */`
49			`#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)`
50			`#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \`
51			`- sizeof(struct switch_stack))`
52			`/* Mapping from PT_xxx to the stack offset at which the register is`
53			`saved. Notice that usp has no stack-slot and needs to be treated`
54			`specially (see get_reg/put_reg below). */`
55			`static int regoff[] = {0,0,0,0,0,0};`
56
57			`/* change a pid into a task struct. */`
58			`static inline struct task_struct * get_task(int pid)`
59			`{`
60			`int i;`
61
62			`for (i = 1; i < NR_TASKS; i++) {`
63			`if (task[i] != NULL && (task[i]->pid == pid))`
64			`return task[i];`
65			`}`
66			`return NULL;`
67			`}`
68
69			`/*`
70			`* Get contents of register REGNO in task TASK.`
71			`*/`
72			`static inline long get_reg(struct task_struct *task, int regno)`
73			`{`
74			`unsigned long *addr;`
75			`/* SIMON */`
76			`#if 0`
77			`if (regno == PT_USP)`
78			`addr = &task->tss.usp;`
79			`else if (regno < sizeof(regoff)/sizeof(regoff[0]))`
80			`addr = (unsigned long *)(task->tss.esp0 + regoff[regno]);`
81			`else`
82			`return 0;`
83			`#endif`
84			`return *addr;`
85			`}`
86
87			`/*`
88			`* Write contents of register REGNO in task TASK.`
89			`*/`
90			`static inline int put_reg(struct task_struct *task, int regno,`
91			`unsigned long data)`
92			`{`
93			`/* SIMON */`
94			`#if 0`
95			`unsigned long *addr;`
96			`if (regno == PT_USP)`
97			`addr = &task->tss.usp;`
98			`else if (regno < sizeof(regoff)/sizeof(regoff[0]))`
99			`addr = (unsigned long *) (task->tss.esp0 + regoff[regno]);`
100			`else`
101			`return -1;`
102			`*addr = data;`
103			`#endif`
104			`return 0;`
105			`}`
106
107			`inline`
108			`static unsigned long get_long(struct task_struct * tsk,`
109			`struct vm_area_struct * vma, unsigned long addr)`
110			`{`
111			`return (unsigned long)addr;`
112			`}`
113
114			`inline`
115			`static void put_long(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long addr,`
116			`unsigned long data)`
117			`{`
118			`(unsigned long)addr = data;`
119			`}`
120
121
122			`inline`
123			`static int read_long(struct task_struct * tsk, unsigned long addr,`
124			`unsigned long * result)`
125			`{`
126			`result = (unsigned long *)addr;`
127			`return 0;`
128			`}`
129
130			`inline`
131			`static int write_long(struct task_struct * tsk, unsigned long addr,`
132			`unsigned long data)`
133			`{`
134			`(unsigned long )addr = data;`
135			`return 0;`
136			`}`
137
138			`asmlinkage int sys_ptrace(long request, long pid, long addr, long data)`
139			`{`
140			`/* SIMON */`
141			`#if 0`
142			`struct task_struct *child;`
143			`struct user * dummy;`
144			`dummy = NULL;`
145
146			`if (request == PTRACE_TRACEME) {`
147			`/* are we already being traced? */`
148			`if (current->flags & PF_PTRACED)`
149			`return -EPERM;`
150			`/* set the ptrace bit in the process flags. */`
151			`current->flags \|= PF_PTRACED;`
152			`return 0;`
153			`}`
154			`if (pid == 1) /* you may not mess with init */`
155			`return -EPERM;`
156			`if (!(child = get_task(pid)))`
157			`return -ESRCH;`
158			`if (request == PTRACE_ATTACH) {`
159			`if (child == current)`
160			`return -EPERM;`
161			`if ((!child->dumpable \|\|`
162			`(current->uid != child->euid) \|\|`
163			`(current->uid != child->suid) \|\|`
164			`(current->uid != child->uid) \|\|`
165			`(current->gid != child->egid) \|\|`
166			`(current->gid != child->sgid) \|\|`
167			`(current->gid != child->gid)) && !suser())`
168			`return -EPERM;`
169			`/* the same process cannot be attached many times */`
170			`if (child->flags & PF_PTRACED)`
171			`return -EPERM;`
172			`child->flags \|= PF_PTRACED;`
173			`if (child->p_pptr != current) {`
174			`REMOVE_LINKS(child);`
175			`child->p_pptr = current;`
176			`SET_LINKS(child);`
177			`}`
178			`send_sig(SIGSTOP, child, 1);`
179			`return 0;`
180			`}`
181			`if (!(child->flags & PF_PTRACED))`
182			`return -ESRCH;`
183			`if (child->state != TASK_STOPPED) {`
184			`if (request != PTRACE_KILL)`
185			`return -ESRCH;`
186			`}`
187			`if (child->p_pptr != current)`
188			`return -ESRCH;`
189
190			`switch (request) {`
191			`/* when I and D space are separate, these will need to be fixed. */`
192			`case PTRACE_PEEKTEXT: /* read word at location addr. */`
193			`case PTRACE_PEEKDATA: {`
194			`unsigned long tmp;`
195			`int res;`
196
197			`res = read_long(child, addr, &tmp);`
198			`if (res < 0)`
199			`return res;`
200			`res = verify_area(VERIFY_WRITE, (void *) data, sizeof(long));`
201			`if (!res)`
202			`put_user(tmp, (unsigned long *) data);`
203			`return res;`
204			`}`
205
206			`/* read the word at location addr in the USER area. */`
207			`case PTRACE_PEEKUSR: {`
208			`unsigned long tmp;`
209			`int res;`
210
211			`if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user))`
212			`return -EIO;`
213
214			`res = verify_area(VERIFY_WRITE, (void *) data,`
215			`sizeof(long));`
216			`if (res)`
217			`return res;`
218			`tmp = 0; /* Default return condition */`
219			`addr = addr >> 2; /* temporary hack. */`
220			`if (addr < 19) {`
221			`tmp = get_reg(child, addr);`
222			`if (addr == PT_SR)`
223			`tmp >>= 16;`
224			`}`
225			`else if (addr >= 21 && addr < 49)`
226			`tmp = child->tss.fp[addr - 21];`
227			`else if (addr == 49)`
228			`tmp = child->mm->start_code;`
229			`else if (addr == 50)`
230			`tmp = child->mm->start_data;`
231			`else`
232			`return -EIO;`
233			`put_user(tmp,(unsigned long *) data);`
234			`return 0;`
235			`}`
236
237			`/* when I and D space are separate, this will have to be fixed. */`
238			`case PTRACE_POKETEXT: /* write the word at location addr. */`
239			`case PTRACE_POKEDATA:`
240			`return write_long(child,addr,data);`
241
242			`case PTRACE_POKEUSR: /* write the word at location addr in the USER area */`
243			`if ((addr & 3) \|\| addr < 0 \|\| addr >= sizeof(struct user))`
244			`return -EIO;`
245
246			`addr = addr >> 2; /* temporary hack. */`
247
248			`if (addr == PT_ORIG_D0)`
249			`return -EIO;`
250			`if (addr == PT_SR) {`
251			`data &= SR_MASK;`
252			`data <<= 16;`
253			`data \|= get_reg(child, PT_SR) & ~(SR_MASK << 16);`
254			`}`
255			`if (addr < 19) {`
256			`if (put_reg(child, addr, data))`
257			`return -EIO;`
258			`return 0;`
259			`}`
260			`if (addr >= 21 && addr < 48)`
261			`{`
262			`child->tss.fp[addr - 21] = data;`
263			`return 0;`
264			`}`
265			`return -EIO;`
266
267			`case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */`
268			`case PTRACE_CONT: { /* restart after signal. */`
269			`long tmp;`
270
271			`if ((unsigned long) data >= NSIG)`
272			`return -EIO;`
273			`if (request == PTRACE_SYSCALL)`
274			`child->flags \|= PF_TRACESYS;`
275			`else`
276			`child->flags &= ~PF_TRACESYS;`
277			`child->exit_code = data;`
278			`wake_up_process(child);`
279			`/* make sure the single step bit is not set. */`
280			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
281			`put_reg(child, PT_SR, tmp);`
282			`return 0;`
283			`}`
284
285			`/*`
286			`* make the child exit. Best I can do is send it a sigkill.`
287			`* perhaps it should be put in the status that it wants to`
288			`* exit.`
289			`*/`
290			`case PTRACE_KILL: {`
291			`long tmp;`
292
293			`if (child->state == TASK_ZOMBIE) /* already dead */`
294			`return 0;`
295			`wake_up_process(child);`
296			`child->exit_code = SIGKILL;`
297			`/* make sure the single step bit is not set. */`
298			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
299			`put_reg(child, PT_SR, tmp);`
300			`return 0;`
301			`}`
302
303			`case PTRACE_SINGLESTEP: { /* set the trap flag. */`
304			`long tmp;`
305
306			`if ((unsigned long) data >= NSIG)`
307			`return -EIO;`
308			`child->flags &= ~PF_TRACESYS;`
309			`tmp = get_reg(child, PT_SR) \| (TRACE_BITS << 16);`
310			`put_reg(child, PT_SR, tmp);`
311
312			`wake_up_process(child);`
313			`child->exit_code = data;`
314			`/* give it a chance to run. */`
315			`return 0;`
316			`}`
317
318			`case PTRACE_DETACH: { /* detach a process that was attached. */`
319			`long tmp;`
320
321			`if ((unsigned long) data >= NSIG)`
322			`return -EIO;`
323			`child->flags &= ~(PF_PTRACED\|PF_TRACESYS);`
324			`wake_up_process(child);`
325			`child->exit_code = data;`
326			`REMOVE_LINKS(child);`
327			`child->p_pptr = child->p_opptr;`
328			`SET_LINKS(child);`
329			`/* make sure the single step bit is not set. */`
330			`tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);`
331			`put_reg(child, PT_SR, tmp);`
332			`return 0;`
333			`}`
334
335			`default:`
336			`return -EIO;`
337			`}`
338			`#endif`
339			`return 0;`
340			`}`
341
342			`asmlinkage void syscall_trace(void)`
343			`{`
344			`if ((current->flags & (PF_PTRACED\|PF_TRACESYS))`
345			`!= (PF_PTRACED\|PF_TRACESYS))`
346			`return;`
347			`current->exit_code = SIGTRAP;`
348			`current->state = TASK_STOPPED;`
349			`notify_parent(current, SIGCHLD);`
350			`schedule();`
351			`/*`
352			`* this isn't the same as continuing with a signal, but it will do`
353			`* for normal use. strace only continues with a signal if the`
354			`* stopping signal is not SIGTRAP. -brl`
355			`*/`
356			`if (current->exit_code)`
357			`current->signal \|= (1 << (current->exit_code - 1));`
358			`current->exit_code = 0;`
359			`return;`
360			`}`