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/compiler.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
21 #include <linux/errno.h>
22 #include <linux/ptrace.h>
23 #include <linux/audit.h>
24 #include <linux/smp.h>
25 #include <linux/smp_lock.h>
26 #include <linux/user.h>
27 #include <linux/security.h>
28 #include <linux/signal.h>
29 #include <linux/vs_base.h>
31 #include <asm/byteorder.h>
35 #include <asm/mipsregs.h>
36 #include <asm/mipsmtregs.h>
37 #include <asm/pgtable.h>
39 #include <asm/system.h>
40 #include <asm/uaccess.h>
41 #include <asm/bootinfo.h>
45 * Called by kernel/ptrace.c when detaching..
47 * Make sure single step bits etc are not set.
49 void ptrace_disable(struct task_struct *child)
55 * Read a general register set. We always use the 64-bit format, even
56 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
57 * Registers are sign extended to fill the available space.
59 int ptrace_getregs (struct task_struct *child, __s64 __user *data)
64 if (!access_ok(VERIFY_WRITE, data, 38 * 8))
67 regs = task_pt_regs(child);
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 = task_pt_regs(child);
96 for (i = 0; i < 32; i++)
97 __get_user (regs->regs[i], data + i);
98 __get_user (regs->lo, data + EF_LO - EF_R0);
99 __get_user (regs->hi, data + EF_HI - EF_R0);
100 __get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
102 /* badvaddr, status, and cause may not be written. */
107 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);
124 __put_user (child->thread.fpu.fcr31, data + 64);
130 if (cpu_has_mipsmt) {
131 unsigned int vpflags = dvpe();
132 flags = read_c0_status();
134 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
135 write_c0_status(flags);
138 flags = read_c0_status();
140 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
141 write_c0_status(flags);
147 __put_user (tmp, data + 65);
152 int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
157 if (!access_ok(VERIFY_READ, data, 33 * 8))
160 fregs = get_fpu_regs(child);
162 for (i = 0; i < 32; i++)
163 __get_user (fregs[i], i + (__u64 __user *) data);
165 __get_user (child->thread.fpu.fcr31, data + 64);
167 /* FIR may not be written. */
172 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
176 if (!vx_check(vx_task_xid(child), VS_WATCH_P|VS_IDENT))
180 /* when I and D space are separate, these will need to be fixed. */
181 case PTRACE_PEEKTEXT: /* read word at location addr. */
182 case PTRACE_PEEKDATA: {
186 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
188 if (copied != sizeof(tmp))
190 ret = put_user(tmp,(unsigned long __user *) data);
194 /* Read the word at location addr in the USER area. */
195 case PTRACE_PEEKUSR: {
196 struct pt_regs *regs;
197 unsigned long tmp = 0;
199 regs = task_pt_regs(child);
200 ret = 0; /* Default return value. */
204 tmp = regs->regs[addr];
206 case FPR_BASE ... FPR_BASE + 31:
207 if (tsk_used_math(child)) {
208 fpureg_t *fregs = get_fpu_regs(child);
212 * The odd registers are actually the high
213 * order bits of the values stored in the even
214 * registers - unless we're using r2k_switch.S.
217 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
219 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
222 tmp = fregs[addr - FPR_BASE];
225 tmp = -1; /* FP not yet used */
232 tmp = regs->cp0_cause;
235 tmp = regs->cp0_badvaddr;
244 tmp = child->thread.fpu.fcr31;
246 case FPC_EIR: { /* implementation / version register */
248 #ifdef CONFIG_MIPS_MT_SMTC
249 unsigned int irqflags;
250 unsigned int mtflags;
251 #endif /* CONFIG_MIPS_MT_SMTC */
259 #ifdef CONFIG_MIPS_MT_SMTC
260 /* Read-modify-write of Status must be atomic */
261 local_irq_save(irqflags);
263 #endif /* CONFIG_MIPS_MT_SMTC */
264 if (cpu_has_mipsmt) {
265 unsigned int vpflags = dvpe();
266 flags = read_c0_status();
268 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
269 write_c0_status(flags);
272 flags = read_c0_status();
274 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
275 write_c0_status(flags);
277 #ifdef CONFIG_MIPS_MT_SMTC
279 local_irq_restore(irqflags);
280 #endif /* CONFIG_MIPS_MT_SMTC */
284 case DSP_BASE ... DSP_BASE + 5: {
292 dregs = __get_dsp_regs(child);
293 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
302 tmp = child->thread.dsp.dspcontrol;
309 ret = put_user(tmp, (unsigned long __user *) data);
313 /* when I and D space are separate, this will have to be fixed. */
314 case PTRACE_POKETEXT: /* write the word at location addr. */
315 case PTRACE_POKEDATA:
317 if (access_process_vm(child, addr, &data, sizeof(data), 1)
323 case PTRACE_POKEUSR: {
324 struct pt_regs *regs;
326 regs = task_pt_regs(child);
330 regs->regs[addr] = data;
332 case FPR_BASE ... FPR_BASE + 31: {
333 fpureg_t *fregs = get_fpu_regs(child);
335 if (!tsk_used_math(child)) {
336 /* FP not yet used */
337 memset(&child->thread.fpu, ~0,
338 sizeof(child->thread.fpu));
339 child->thread.fpu.fcr31 = 0;
343 * The odd registers are actually the high order bits
344 * of the values stored in the even registers - unless
345 * we're using r2k_switch.S.
348 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
349 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
351 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
352 fregs[addr - FPR_BASE] |= data;
356 fregs[addr - FPR_BASE] = data;
361 regs->cp0_epc = data;
370 child->thread.fpu.fcr31 = data;
372 case DSP_BASE ... DSP_BASE + 5: {
380 dregs = __get_dsp_regs(child);
381 dregs[addr - DSP_BASE] = data;
389 child->thread.dsp.dspcontrol = data;
392 /* The rest are not allowed. */
400 ret = ptrace_getregs (child, (__u64 __user *) data);
404 ret = ptrace_setregs (child, (__u64 __user *) data);
407 case PTRACE_GETFPREGS:
408 ret = ptrace_getfpregs (child, (__u32 __user *) data);
411 case PTRACE_SETFPREGS:
412 ret = ptrace_setfpregs (child, (__u32 __user *) data);
415 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
416 case PTRACE_CONT: { /* restart after signal. */
418 if (!valid_signal(data))
420 if (request == PTRACE_SYSCALL) {
421 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
424 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
426 child->exit_code = data;
427 wake_up_process(child);
433 * make the child exit. Best I can do is send it a sigkill.
434 * perhaps it should be put in the status that it wants to
439 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
441 child->exit_code = SIGKILL;
442 wake_up_process(child);
445 case PTRACE_DETACH: /* detach a process that was attached. */
446 ret = ptrace_detach(child, data);
449 case PTRACE_GET_THREAD_AREA:
450 ret = put_user(task_thread_info(child)->tp_value,
451 (unsigned long __user *) data);
455 ret = ptrace_request(child, request, addr, data);
462 static inline int audit_arch(void)
466 arch |= __AUDIT_ARCH_64BIT;
468 #if defined(__LITTLE_ENDIAN)
469 arch |= __AUDIT_ARCH_LE;
475 * Notification of system call entry/exit
476 * - triggered by current->work.syscall_trace
478 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
480 if (unlikely(current->audit_context) && entryexit)
481 audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]),
484 if (test_thread_flag(TIF_SYSCALL_TRACE))
485 tracehook_report_syscall(regs, entryexit);
487 if (unlikely(current->audit_context) && !entryexit)
488 audit_syscall_entry(audit_arch(), regs->regs[2],
489 regs->regs[4], regs->regs[5],
490 regs->regs[6], regs->regs[7]);