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/smp.h>
24 #include <linux/user.h>
25 #include <linux/security.h>
26 #include <linux/audit.h>
27 #include <linux/seccomp.h>
29 #include <asm/byteorder.h>
33 #include <asm/mipsregs.h>
34 #include <asm/mipsmtregs.h>
35 #include <asm/pgtable.h>
37 #include <asm/system.h>
38 #include <asm/uaccess.h>
39 #include <asm/bootinfo.h>
43 * Called by kernel/ptrace.c when detaching..
45 * Make sure single step bits etc are not set.
47 void ptrace_disable(struct task_struct *child)
49 /* Don't load the watchpoint registers for the ex-child. */
50 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
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 = task_pt_regs(child);
68 for (i = 0; i < 32; i++)
69 __put_user((long)regs->regs[i], data + i);
70 __put_user((long)regs->lo, data + EF_LO - EF_R0);
71 __put_user((long)regs->hi, data + EF_HI - EF_R0);
72 __put_user((long)regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
73 __put_user((long)regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
74 __put_user((long)regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
75 __put_user((long)regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
81 * Write a general register set. As for PTRACE_GETREGS, we always use
82 * the 64-bit format. On a 32-bit kernel only the lower order half
83 * (according to endianness) will be used.
85 int ptrace_setregs(struct task_struct *child, __s64 __user *data)
90 if (!access_ok(VERIFY_READ, data, 38 * 8))
93 regs = task_pt_regs(child);
95 for (i = 0; i < 32; i++)
96 __get_user(regs->regs[i], data + i);
97 __get_user(regs->lo, data + EF_LO - EF_R0);
98 __get_user(regs->hi, data + EF_HI - EF_R0);
99 __get_user(regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
101 /* badvaddr, status, and cause may not be written. */
106 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
111 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
114 if (tsk_used_math(child)) {
115 fpureg_t *fregs = get_fpu_regs(child);
116 for (i = 0; i < 32; i++)
117 __put_user(fregs[i], i + (__u64 __user *) data);
119 for (i = 0; i < 32; i++)
120 __put_user((__u64) -1, i + (__u64 __user *) data);
123 __put_user(child->thread.fpu.fcr31, data + 64);
129 if (cpu_has_mipsmt) {
130 unsigned int vpflags = dvpe();
131 flags = read_c0_status();
133 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
134 write_c0_status(flags);
137 flags = read_c0_status();
139 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
140 write_c0_status(flags);
146 __put_user(tmp, data + 65);
151 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
156 if (!access_ok(VERIFY_READ, data, 33 * 8))
159 fregs = get_fpu_regs(child);
161 for (i = 0; i < 32; i++)
162 __get_user(fregs[i], i + (__u64 __user *) data);
164 __get_user(child->thread.fpu.fcr31, data + 64);
166 /* FIR may not be written. */
171 int ptrace_get_watch_regs(struct task_struct *child,
172 struct pt_watch_regs __user *addr)
174 enum pt_watch_style style;
177 if (!cpu_has_watch || current_cpu_data.watch_reg_use_cnt == 0)
179 if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
183 style = pt_watch_style_mips32;
184 #define WATCH_STYLE mips32
186 style = pt_watch_style_mips64;
187 #define WATCH_STYLE mips64
190 __put_user(style, &addr->style);
191 __put_user(current_cpu_data.watch_reg_use_cnt,
192 &addr->WATCH_STYLE.num_valid);
193 for (i = 0; i < current_cpu_data.watch_reg_use_cnt; i++) {
194 __put_user(child->thread.watch.mips3264.watchlo[i],
195 &addr->WATCH_STYLE.watchlo[i]);
196 __put_user(child->thread.watch.mips3264.watchhi[i] & 0xfff,
197 &addr->WATCH_STYLE.watchhi[i]);
198 __put_user(current_cpu_data.watch_reg_masks[i],
199 &addr->WATCH_STYLE.watch_masks[i]);
202 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
203 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
204 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
210 int ptrace_set_watch_regs(struct task_struct *child,
211 struct pt_watch_regs __user *addr)
214 int watch_active = 0;
215 unsigned long lt[NUM_WATCH_REGS];
216 u16 ht[NUM_WATCH_REGS];
218 if (!cpu_has_watch || current_cpu_data.watch_reg_use_cnt == 0)
220 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
222 /* Check the values. */
223 for (i = 0; i < current_cpu_data.watch_reg_use_cnt; i++) {
224 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
226 if (lt[i] & __UA_LIMIT)
229 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
230 if (lt[i] & 0xffffffff80000000UL)
233 if (lt[i] & __UA_LIMIT)
237 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
242 for (i = 0; i < current_cpu_data.watch_reg_use_cnt; i++) {
245 child->thread.watch.mips3264.watchlo[i] = lt[i];
247 child->thread.watch.mips3264.watchhi[i] = ht[i];
251 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
253 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
258 long arch_ptrace(struct task_struct *child, long request,
259 unsigned long addr, unsigned long data)
264 /* when I and D space are separate, these will need to be fixed. */
265 case PTRACE_PEEKTEXT: /* read word at location addr. */
266 case PTRACE_PEEKDATA:
267 ret = generic_ptrace_peekdata(child, addr, data);
270 /* Read the word at location addr in the USER area. */
271 case PTRACE_PEEKUSR: {
272 struct pt_regs *regs;
273 unsigned long tmp = 0;
275 regs = task_pt_regs(child);
276 ret = 0; /* Default return value. */
280 tmp = regs->regs[addr];
282 case FPR_BASE ... FPR_BASE + 31:
283 if (tsk_used_math(child)) {
284 fpureg_t *fregs = get_fpu_regs(child);
288 * The odd registers are actually the high
289 * order bits of the values stored in the even
290 * registers - unless we're using r2k_switch.S.
293 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
295 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
298 tmp = fregs[addr - FPR_BASE];
301 tmp = -1; /* FP not yet used */
308 tmp = regs->cp0_cause;
311 tmp = regs->cp0_badvaddr;
319 #ifdef CONFIG_CPU_HAS_SMARTMIPS
325 tmp = child->thread.fpu.fcr31;
327 case FPC_EIR: { /* implementation / version register */
329 #ifdef CONFIG_MIPS_MT_SMTC
330 unsigned long irqflags;
331 unsigned int mtflags;
332 #endif /* CONFIG_MIPS_MT_SMTC */
340 #ifdef CONFIG_MIPS_MT_SMTC
341 /* Read-modify-write of Status must be atomic */
342 local_irq_save(irqflags);
344 #endif /* CONFIG_MIPS_MT_SMTC */
345 if (cpu_has_mipsmt) {
346 unsigned int vpflags = dvpe();
347 flags = read_c0_status();
349 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
350 write_c0_status(flags);
353 flags = read_c0_status();
355 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
356 write_c0_status(flags);
358 #ifdef CONFIG_MIPS_MT_SMTC
360 local_irq_restore(irqflags);
361 #endif /* CONFIG_MIPS_MT_SMTC */
365 case DSP_BASE ... DSP_BASE + 5: {
373 dregs = __get_dsp_regs(child);
374 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
383 tmp = child->thread.dsp.dspcontrol;
390 ret = put_user(tmp, (unsigned long __user *) data);
394 /* when I and D space are separate, this will have to be fixed. */
395 case PTRACE_POKETEXT: /* write the word at location addr. */
396 case PTRACE_POKEDATA:
397 ret = generic_ptrace_pokedata(child, addr, data);
400 case PTRACE_POKEUSR: {
401 struct pt_regs *regs;
403 regs = task_pt_regs(child);
407 regs->regs[addr] = data;
409 case FPR_BASE ... FPR_BASE + 31: {
410 fpureg_t *fregs = get_fpu_regs(child);
412 if (!tsk_used_math(child)) {
413 /* FP not yet used */
414 memset(&child->thread.fpu, ~0,
415 sizeof(child->thread.fpu));
416 child->thread.fpu.fcr31 = 0;
420 * The odd registers are actually the high order bits
421 * of the values stored in the even registers - unless
422 * we're using r2k_switch.S.
425 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
426 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
428 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
429 fregs[addr - FPR_BASE] |= data;
433 fregs[addr - FPR_BASE] = data;
438 regs->cp0_epc = data;
446 #ifdef CONFIG_CPU_HAS_SMARTMIPS
452 child->thread.fpu.fcr31 = data;
454 case DSP_BASE ... DSP_BASE + 5: {
462 dregs = __get_dsp_regs(child);
463 dregs[addr - DSP_BASE] = data;
471 child->thread.dsp.dspcontrol = data;
474 /* The rest are not allowed. */
482 ret = ptrace_getregs(child, (__s64 __user *) data);
486 ret = ptrace_setregs(child, (__s64 __user *) data);
489 case PTRACE_GETFPREGS:
490 ret = ptrace_getfpregs(child, (__u32 __user *) data);
493 case PTRACE_SETFPREGS:
494 ret = ptrace_setfpregs(child, (__u32 __user *) data);
497 case PTRACE_GET_THREAD_AREA:
498 ret = put_user(task_thread_info(child)->tp_value,
499 (unsigned long __user *) data);
502 case PTRACE_GET_WATCH_REGS:
503 ret = ptrace_get_watch_regs(child,
504 (struct pt_watch_regs __user *) addr);
507 case PTRACE_SET_WATCH_REGS:
508 ret = ptrace_set_watch_regs(child,
509 (struct pt_watch_regs __user *) addr);
513 ret = ptrace_request(child, request, addr, data);
520 static inline int audit_arch(void)
524 arch |= __AUDIT_ARCH_64BIT;
526 #if defined(__LITTLE_ENDIAN)
527 arch |= __AUDIT_ARCH_LE;
533 * Notification of system call entry/exit
534 * - triggered by current->work.syscall_trace
536 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
538 /* do the secure computing check first */
540 secure_computing(regs->regs[2]);
542 if (unlikely(current->audit_context) && entryexit)
543 audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]),
546 if (!(current->ptrace & PT_PTRACED))
549 if (!test_thread_flag(TIF_SYSCALL_TRACE))
552 /* The 0x80 provides a way for the tracing parent to distinguish
553 between a syscall stop and SIGTRAP delivery */
554 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
558 * this isn't the same as continuing with a signal, but it will do
559 * for normal use. strace only continues with a signal if the
560 * stopping signal is not SIGTRAP. -brl
562 if (current->exit_code) {
563 send_sig(current->exit_code, current, 1);
564 current->exit_code = 0;
568 if (unlikely(current->audit_context) && !entryexit)
569 audit_syscall_entry(audit_arch(), regs->regs[2],
570 regs->regs[4], regs->regs[5],
571 regs->regs[6], regs->regs[7]);