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>
32 #include <asm/mipsregs.h>
33 #include <asm/pgtable.h>
35 #include <asm/system.h>
36 #include <asm/uaccess.h>
37 #include <asm/bootinfo.h>
40 * Called by kernel/ptrace.c when detaching..
42 * Make sure single step bits etc are not set.
44 void ptrace_disable(struct task_struct *child)
49 asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
51 struct task_struct *child;
55 printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
56 (int) request, (int) pid, (unsigned long) addr,
57 (unsigned long) data);
61 if (request == PTRACE_TRACEME) {
62 /* are we already being traced? */
63 if (current->ptrace & PT_PTRACED)
65 if ((ret = security_ptrace(current->parent, current)))
67 /* set the ptrace bit in the process flags. */
68 current->ptrace |= PT_PTRACED;
73 read_lock(&tasklist_lock);
74 child = find_task_by_pid(pid);
76 get_task_struct(child);
77 read_unlock(&tasklist_lock);
82 if (pid == 1) /* you may not mess with init */
85 if (request == PTRACE_ATTACH) {
86 ret = ptrace_attach(child);
90 ret = ptrace_check_attach(child, request == PTRACE_KILL);
95 /* when I and D space are separate, these will need to be fixed. */
96 case PTRACE_PEEKTEXT: /* read word at location addr. */
97 case PTRACE_PEEKDATA: {
101 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
103 if (copied != sizeof(tmp))
105 ret = put_user(tmp,(unsigned long *) data);
109 /* Read the word at location addr in the USER area. */
110 case PTRACE_PEEKUSR: {
111 struct pt_regs *regs;
112 unsigned long tmp = 0;
114 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
115 THREAD_SIZE - 32 - sizeof(struct pt_regs));
116 ret = 0; /* Default return value. */
120 tmp = regs->regs[addr];
122 case FPR_BASE ... FPR_BASE + 31:
123 if (tsk_used_math(child)) {
124 fpureg_t *fregs = get_fpu_regs(child);
128 * The odd registers are actually the high
129 * order bits of the values stored in the even
130 * registers - unless we're using r2k_switch.S.
133 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
135 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
138 tmp = fregs[addr - FPR_BASE];
141 tmp = -1; /* FP not yet used */
148 tmp = regs->cp0_cause;
151 tmp = regs->cp0_badvaddr;
161 tmp = child->thread.fpu.hard.fcr31;
163 tmp = child->thread.fpu.soft.fcr31;
165 case FPC_EIR: { /* implementation / version register */
171 flags = read_c0_status();
173 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
174 write_c0_status(flags);
182 ret = put_user(tmp, (unsigned long *) data);
186 /* when I and D space are separate, this will have to be fixed. */
187 case PTRACE_POKETEXT: /* write the word at location addr. */
188 case PTRACE_POKEDATA:
190 if (access_process_vm(child, addr, &data, sizeof(data), 1)
196 case PTRACE_POKEUSR: {
197 struct pt_regs *regs;
199 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
200 THREAD_SIZE - 32 - sizeof(struct pt_regs));
204 regs->regs[addr] = data;
206 case FPR_BASE ... FPR_BASE + 31: {
207 fpureg_t *fregs = get_fpu_regs(child);
209 if (!tsk_used_math(child)) {
210 /* FP not yet used */
211 memset(&child->thread.fpu.hard, ~0,
212 sizeof(child->thread.fpu.hard));
213 child->thread.fpu.hard.fcr31 = 0;
217 * The odd registers are actually the high order bits
218 * of the values stored in the even registers - unless
219 * we're using r2k_switch.S.
222 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
223 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
225 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
226 fregs[addr - FPR_BASE] |= data;
230 fregs[addr - FPR_BASE] = data;
235 regs->cp0_epc = data;
245 child->thread.fpu.hard.fcr31 = data;
247 child->thread.fpu.soft.fcr31 = data;
250 /* The rest are not allowed. */
257 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
258 case PTRACE_CONT: { /* restart after signal. */
260 if ((unsigned long) data > _NSIG)
262 if (request == PTRACE_SYSCALL) {
263 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
266 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
268 child->exit_code = data;
269 wake_up_process(child);
275 * make the child exit. Best I can do is send it a sigkill.
276 * perhaps it should be put in the status that it wants to
281 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
283 child->exit_code = SIGKILL;
284 wake_up_process(child);
287 case PTRACE_DETACH: /* detach a process that was attached. */
288 ret = ptrace_detach(child, data);
292 ret = ptrace_request(child, request, addr, data);
297 put_task_struct(child);
303 static inline int audit_arch()
305 #ifdef CONFIG_CPU_LITTLE_ENDIAN
307 if (!(current->thread.mflags & MF_32BIT_REGS))
308 return AUDIT_ARCH_MIPSEL64;
310 return AUDIT_ARCH_MIPSEL;
312 #else /* big endian... */
314 if (!(current->thread.mflags & MF_32BIT_REGS))
315 return AUDIT_ARCH_MIPS64;
317 return AUDIT_ARCH_MIPS;
323 * Notification of system call entry/exit
324 * - triggered by current->work.syscall_trace
326 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
328 if (unlikely(current->audit_context) && entryexit)
329 audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]), regs->regs[2]);
331 if (!test_thread_flag(TIF_SYSCALL_TRACE))
333 if (!(current->ptrace & PT_PTRACED))
336 /* The 0x80 provides a way for the tracing parent to distinguish
337 between a syscall stop and SIGTRAP delivery */
338 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
342 * this isn't the same as continuing with a signal, but it will do
343 * for normal use. strace only continues with a signal if the
344 * stopping signal is not SIGTRAP. -brl
346 if (current->exit_code) {
347 send_sig(current->exit_code, current, 1);
348 current->exit_code = 0;
351 if (unlikely(current->audit_context) && !entryexit)
352 audit_syscall_entry(current, audit_arch(), regs->regs[2],
353 regs->regs[4], regs->regs[5],
354 regs->regs[6], regs->regs[7]);