2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1992 Ross Biro
7 * Copyright (C) Linus Torvalds
8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
9 * Copyright (C) 1996 David S. Miller
10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
11 * Copyright (C) 1999 MIPS Technologies, Inc.
12 * Copyright (C) 2000 Ulf Carlsson
14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
17 #include <linux/config.h>
18 #include <linux/compiler.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
22 #include <linux/errno.h>
23 #include <linux/ptrace.h>
24 #include <linux/audit.h>
25 #include <linux/smp.h>
26 #include <linux/smp_lock.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
29 #include <linux/signal.h>
31 #include <asm/byteorder.h>
35 #include <asm/mipsregs.h>
36 #include <asm/pgtable.h>
38 #include <asm/system.h>
39 #include <asm/uaccess.h>
40 #include <asm/bootinfo.h>
44 * Called by kernel/ptrace.c when detaching..
46 * Make sure single step bits etc are not set.
48 void ptrace_disable(struct task_struct *child)
54 * Read a general register set. We always use the 64-bit format, even
55 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
56 * Registers are sign extended to fill the available space.
58 int ptrace_getregs (struct task_struct *child, __s64 __user *data)
63 if (!access_ok(VERIFY_WRITE, data, 38 * 8))
66 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
67 THREAD_SIZE - 32 - sizeof(struct pt_regs));
69 for (i = 0; i < 32; i++)
70 __put_user (regs->regs[i], data + i);
71 __put_user (regs->lo, data + EF_LO - EF_R0);
72 __put_user (regs->hi, data + EF_HI - EF_R0);
73 __put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
74 __put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
75 __put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
76 __put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
82 * Write a general register set. As for PTRACE_GETREGS, we always use
83 * the 64-bit format. On a 32-bit kernel only the lower order half
84 * (according to endianness) will be used.
86 int ptrace_setregs (struct task_struct *child, __s64 __user *data)
91 if (!access_ok(VERIFY_READ, data, 38 * 8))
94 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
95 THREAD_SIZE - 32 - sizeof(struct pt_regs));
97 for (i = 0; i < 32; i++)
98 __get_user (regs->regs[i], data + i);
99 __get_user (regs->lo, data + EF_LO - EF_R0);
100 __get_user (regs->hi, data + EF_HI - EF_R0);
101 __get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
103 /* badvaddr, status, and cause may not be written. */
108 int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
112 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
115 if (tsk_used_math(child)) {
116 fpureg_t *fregs = get_fpu_regs(child);
117 for (i = 0; i < 32; i++)
118 __put_user (fregs[i], i + (__u64 __user *) data);
120 for (i = 0; i < 32; i++)
121 __put_user ((__u64) -1, i + (__u64 __user *) data);
125 unsigned int flags, tmp;
127 __put_user (child->thread.fpu.hard.fcr31, data + 64);
129 flags = read_c0_status();
131 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
132 write_c0_status(flags);
133 __put_user (tmp, data + 65);
135 __put_user (child->thread.fpu.soft.fcr31, data + 64);
136 __put_user ((__u32) 0, data + 65);
142 int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
147 if (!access_ok(VERIFY_READ, data, 33 * 8))
150 fregs = get_fpu_regs(child);
152 for (i = 0; i < 32; i++)
153 __get_user (fregs[i], i + (__u64 __user *) data);
156 __get_user (child->thread.fpu.hard.fcr31, data + 64);
158 __get_user (child->thread.fpu.soft.fcr31, data + 64);
160 /* FIR may not be written. */
165 asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
167 struct task_struct *child;
171 printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
172 (int) request, (int) pid, (unsigned long) addr,
173 (unsigned long) data);
177 if (request == PTRACE_TRACEME) {
178 /* are we already being traced? */
179 if (current->ptrace & PT_PTRACED)
181 if ((ret = security_ptrace(current->parent, current)))
183 /* set the ptrace bit in the process flags. */
184 current->ptrace |= PT_PTRACED;
189 read_lock(&tasklist_lock);
190 child = find_task_by_pid(pid);
192 get_task_struct(child);
193 read_unlock(&tasklist_lock);
198 if (pid == 1) /* you may not mess with init */
201 if (request == PTRACE_ATTACH) {
202 ret = ptrace_attach(child);
206 ret = ptrace_check_attach(child, request == PTRACE_KILL);
211 /* when I and D space are separate, these will need to be fixed. */
212 case PTRACE_PEEKTEXT: /* read word at location addr. */
213 case PTRACE_PEEKDATA: {
217 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
219 if (copied != sizeof(tmp))
221 ret = put_user(tmp,(unsigned long __user *) data);
225 /* Read the word at location addr in the USER area. */
226 case PTRACE_PEEKUSR: {
227 struct pt_regs *regs;
228 unsigned long tmp = 0;
230 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
231 THREAD_SIZE - 32 - sizeof(struct pt_regs));
232 ret = 0; /* Default return value. */
236 tmp = regs->regs[addr];
238 case FPR_BASE ... FPR_BASE + 31:
239 if (tsk_used_math(child)) {
240 fpureg_t *fregs = get_fpu_regs(child);
244 * The odd registers are actually the high
245 * order bits of the values stored in the even
246 * registers - unless we're using r2k_switch.S.
249 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
251 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
254 tmp = fregs[addr - FPR_BASE];
257 tmp = -1; /* FP not yet used */
264 tmp = regs->cp0_cause;
267 tmp = regs->cp0_badvaddr;
277 tmp = child->thread.fpu.hard.fcr31;
279 tmp = child->thread.fpu.soft.fcr31;
281 case FPC_EIR: { /* implementation / version register */
287 flags = read_c0_status();
289 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
290 write_c0_status(flags);
293 case DSP_BASE ... DSP_BASE + 5: {
301 if (child->thread.dsp.used_dsp) {
302 dregs = __get_dsp_regs(child);
303 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
305 tmp = -1; /* DSP registers yet used */
315 tmp = child->thread.dsp.dspcontrol;
322 ret = put_user(tmp, (unsigned long __user *) data);
326 /* when I and D space are separate, this will have to be fixed. */
327 case PTRACE_POKETEXT: /* write the word at location addr. */
328 case PTRACE_POKEDATA:
330 if (access_process_vm(child, addr, &data, sizeof(data), 1)
336 case PTRACE_POKEUSR: {
337 struct pt_regs *regs;
339 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
340 THREAD_SIZE - 32 - sizeof(struct pt_regs));
344 regs->regs[addr] = data;
346 case FPR_BASE ... FPR_BASE + 31: {
347 fpureg_t *fregs = get_fpu_regs(child);
349 if (!tsk_used_math(child)) {
350 /* FP not yet used */
351 memset(&child->thread.fpu.hard, ~0,
352 sizeof(child->thread.fpu.hard));
353 child->thread.fpu.hard.fcr31 = 0;
357 * The odd registers are actually the high order bits
358 * of the values stored in the even registers - unless
359 * we're using r2k_switch.S.
362 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
363 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
365 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
366 fregs[addr - FPR_BASE] |= data;
370 fregs[addr - FPR_BASE] = data;
375 regs->cp0_epc = data;
385 child->thread.fpu.hard.fcr31 = data;
387 child->thread.fpu.soft.fcr31 = data;
389 case DSP_BASE ... DSP_BASE + 5: {
397 dregs = __get_dsp_regs(child);
398 dregs[addr - DSP_BASE] = data;
406 child->thread.dsp.dspcontrol = data;
409 /* The rest are not allowed. */
417 ret = ptrace_getregs (child, (__u64 __user *) data);
421 ret = ptrace_setregs (child, (__u64 __user *) data);
424 case PTRACE_GETFPREGS:
425 ret = ptrace_getfpregs (child, (__u32 __user *) data);
428 case PTRACE_SETFPREGS:
429 ret = ptrace_setfpregs (child, (__u32 __user *) data);
432 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
433 case PTRACE_CONT: { /* restart after signal. */
435 if (!valid_signal(data))
437 if (request == PTRACE_SYSCALL) {
438 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
441 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
443 child->exit_code = data;
444 wake_up_process(child);
450 * make the child exit. Best I can do is send it a sigkill.
451 * perhaps it should be put in the status that it wants to
456 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
458 child->exit_code = SIGKILL;
459 wake_up_process(child);
462 case PTRACE_DETACH: /* detach a process that was attached. */
463 ret = ptrace_detach(child, data);
466 case PTRACE_GET_THREAD_AREA:
467 ret = put_user(child->thread_info->tp_value,
468 (unsigned long __user *) data);
472 ret = ptrace_request(child, request, addr, data);
477 put_task_struct(child);
483 static inline int audit_arch(void)
487 arch |= __AUDIT_ARCH_64BIT;
489 #if defined(__LITTLE_ENDIAN)
490 arch |= __AUDIT_ARCH_LE;
496 * Notification of system call entry/exit
497 * - triggered by current->work.syscall_trace
499 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
501 if (unlikely(current->audit_context) && entryexit)
502 audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]),
505 if (!(current->ptrace & PT_PTRACED))
507 if (!test_thread_flag(TIF_SYSCALL_TRACE))
510 /* The 0x80 provides a way for the tracing parent to distinguish
511 between a syscall stop and SIGTRAP delivery */
512 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
516 * this isn't the same as continuing with a signal, but it will do
517 * for normal use. strace only continues with a signal if the
518 * stopping signal is not SIGTRAP. -brl
520 if (current->exit_code) {
521 send_sig(current->exit_code, current, 1);
522 current->exit_code = 0;
525 if (unlikely(current->audit_context) && !entryexit)
526 audit_syscall_entry(current, audit_arch(), regs->regs[2],
527 regs->regs[4], regs->regs[5],
528 regs->regs[6], regs->regs[7]);