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>
30 #include <asm/byteorder.h>
34 #include <asm/mipsregs.h>
35 #include <asm/mipsmtregs.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 = task_pt_regs(child);
68 for (i = 0; i < 32; i++)
69 __put_user (regs->regs[i], data + i);
70 __put_user (regs->lo, data + EF_LO - EF_R0);
71 __put_user (regs->hi, data + EF_HI - EF_R0);
72 __put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
73 __put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
74 __put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
75 __put_user (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)
110 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
113 if (tsk_used_math(child)) {
114 fpureg_t *fregs = get_fpu_regs(child);
115 for (i = 0; i < 32; i++)
116 __put_user (fregs[i], i + (__u64 __user *) data);
118 for (i = 0; i < 32; i++)
119 __put_user ((__u64) -1, i + (__u64 __user *) data);
122 __put_user (child->thread.fpu.fcr31, data + 64);
125 unsigned int flags, tmp;
128 if (cpu_has_mipsmt) {
129 unsigned int vpflags = dvpe();
130 flags = read_c0_status();
132 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
133 write_c0_status(flags);
136 flags = read_c0_status();
138 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
139 write_c0_status(flags);
142 __put_user (tmp, data + 65);
144 __put_user ((__u32) 0, data + 65);
150 int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
155 if (!access_ok(VERIFY_READ, data, 33 * 8))
158 fregs = get_fpu_regs(child);
160 for (i = 0; i < 32; i++)
161 __get_user (fregs[i], i + (__u64 __user *) data);
163 __get_user (child->thread.fpu.fcr31, data + 64);
165 /* FIR may not be written. */
170 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
174 if (!vx_check(vx_task_xid(child), VX_WATCH|VX_IDENT))
178 /* when I and D space are separate, these will need to be fixed. */
179 case PTRACE_PEEKTEXT: /* read word at location addr. */
180 case PTRACE_PEEKDATA: {
184 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
186 if (copied != sizeof(tmp))
188 ret = put_user(tmp,(unsigned long __user *) data);
192 /* Read the word at location addr in the USER area. */
193 case PTRACE_PEEKUSR: {
194 struct pt_regs *regs;
195 unsigned long tmp = 0;
197 regs = task_pt_regs(child);
198 ret = 0; /* Default return value. */
202 tmp = regs->regs[addr];
204 case FPR_BASE ... FPR_BASE + 31:
205 if (tsk_used_math(child)) {
206 fpureg_t *fregs = get_fpu_regs(child);
210 * The odd registers are actually the high
211 * order bits of the values stored in the even
212 * registers - unless we're using r2k_switch.S.
215 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
217 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
220 tmp = fregs[addr - FPR_BASE];
223 tmp = -1; /* FP not yet used */
230 tmp = regs->cp0_cause;
233 tmp = regs->cp0_badvaddr;
242 tmp = child->thread.fpu.fcr31;
244 case FPC_EIR: { /* implementation / version register */
246 #ifdef CONFIG_MIPS_MT_SMTC
247 unsigned int irqflags;
248 unsigned int mtflags;
249 #endif /* CONFIG_MIPS_MT_SMTC */
254 #ifdef CONFIG_MIPS_MT_SMTC
255 /* Read-modify-write of Status must be atomic */
256 local_irq_save(irqflags);
258 #endif /* CONFIG_MIPS_MT_SMTC */
261 if (cpu_has_mipsmt) {
262 unsigned int vpflags = dvpe();
263 flags = read_c0_status();
265 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
266 write_c0_status(flags);
269 flags = read_c0_status();
271 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
272 write_c0_status(flags);
274 #ifdef CONFIG_MIPS_MT_SMTC
276 local_irq_restore(irqflags);
277 #endif /* CONFIG_MIPS_MT_SMTC */
281 case DSP_BASE ... DSP_BASE + 5: {
289 dregs = __get_dsp_regs(child);
290 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
299 tmp = child->thread.dsp.dspcontrol;
306 ret = put_user(tmp, (unsigned long __user *) data);
310 /* when I and D space are separate, this will have to be fixed. */
311 case PTRACE_POKETEXT: /* write the word at location addr. */
312 case PTRACE_POKEDATA:
314 if (access_process_vm(child, addr, &data, sizeof(data), 1)
320 case PTRACE_POKEUSR: {
321 struct pt_regs *regs;
323 regs = task_pt_regs(child);
327 regs->regs[addr] = data;
329 case FPR_BASE ... FPR_BASE + 31: {
330 fpureg_t *fregs = get_fpu_regs(child);
332 if (!tsk_used_math(child)) {
333 /* FP not yet used */
334 memset(&child->thread.fpu, ~0,
335 sizeof(child->thread.fpu));
336 child->thread.fpu.fcr31 = 0;
340 * The odd registers are actually the high order bits
341 * of the values stored in the even registers - unless
342 * we're using r2k_switch.S.
345 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
346 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
348 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
349 fregs[addr - FPR_BASE] |= data;
353 fregs[addr - FPR_BASE] = data;
358 regs->cp0_epc = data;
367 child->thread.fpu.fcr31 = data;
369 case DSP_BASE ... DSP_BASE + 5: {
377 dregs = __get_dsp_regs(child);
378 dregs[addr - DSP_BASE] = data;
386 child->thread.dsp.dspcontrol = data;
389 /* The rest are not allowed. */
397 ret = ptrace_getregs (child, (__u64 __user *) data);
401 ret = ptrace_setregs (child, (__u64 __user *) data);
404 case PTRACE_GETFPREGS:
405 ret = ptrace_getfpregs (child, (__u32 __user *) data);
408 case PTRACE_SETFPREGS:
409 ret = ptrace_setfpregs (child, (__u32 __user *) data);
412 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
413 case PTRACE_CONT: { /* restart after signal. */
415 if (!valid_signal(data))
417 if (request == PTRACE_SYSCALL) {
418 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
421 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
423 child->exit_code = data;
424 wake_up_process(child);
430 * make the child exit. Best I can do is send it a sigkill.
431 * perhaps it should be put in the status that it wants to
436 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
438 child->exit_code = SIGKILL;
439 wake_up_process(child);
442 case PTRACE_DETACH: /* detach a process that was attached. */
443 ret = ptrace_detach(child, data);
446 case PTRACE_GET_THREAD_AREA:
447 ret = put_user(task_thread_info(child)->tp_value,
448 (unsigned long __user *) data);
452 ret = ptrace_request(child, request, addr, data);
459 static inline int audit_arch(void)
463 arch |= __AUDIT_ARCH_64BIT;
465 #if defined(__LITTLE_ENDIAN)
466 arch |= __AUDIT_ARCH_LE;
472 * Notification of system call entry/exit
473 * - triggered by current->work.syscall_trace
475 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
477 if (unlikely(current->audit_context) && entryexit)
478 audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]),
481 if (test_thread_flag(TIF_SYSCALL_TRACE))
482 tracehook_report_syscall(regs, entryexit);
484 if (unlikely(current->audit_context) && !entryexit)
485 audit_syscall_entry(audit_arch(), regs->regs[2],
486 regs->regs[4], regs->regs[5],
487 regs->regs[6], regs->regs[7]);