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/compat.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/sched/task_stack.h>
23 #include <linux/errno.h>
24 #include <linux/ptrace.h>
25 #include <linux/smp.h>
26 #include <linux/security.h>
31 #include <asm/mipsregs.h>
32 #include <asm/mipsmtregs.h>
33 #include <asm/pgtable.h>
36 #include <asm/syscall.h>
37 #include <linux/uaccess.h>
38 #include <asm/bootinfo.h>
41 * Tracing a 32-bit process with a 64-bit strace and vice versa will not
42 * work. I don't know how to fix this.
44 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
45 compat_ulong_t caddr, compat_ulong_t cdata)
54 * Read 4 bytes of the other process' storage
55 * data is a pointer specifying where the user wants the
57 * addr is a pointer in the user's storage that contains an 8 byte
58 * address in the other process of the 4 bytes that is to be read
59 * (this is run in a 32-bit process looking at a 64-bit process)
60 * when I and D space are separate, these will need to be fixed.
62 case PTRACE_PEEKTEXT_3264:
63 case PTRACE_PEEKDATA_3264: {
66 u32 __user * addrOthers;
70 /* Get the addr in the other process that we want to read */
71 if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
74 copied = ptrace_access_vm(child, (u64)addrOthers, &tmp,
75 sizeof(tmp), FOLL_FORCE);
76 if (copied != sizeof(tmp))
78 ret = put_user(tmp, (u32 __user *) (unsigned long) data);
82 /* Read the word at location addr in the USER area. */
83 case PTRACE_PEEKUSR: {
88 regs = task_pt_regs(child);
89 ret = 0; /* Default return value. */
93 tmp = regs->regs[addr];
95 case FPR_BASE ... FPR_BASE + 31:
96 if (!tsk_used_math(child)) {
101 fregs = get_fpu_regs(child);
102 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
104 * The odd registers are actually the high
105 * order bits of the values stored in the even
108 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
112 tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
118 tmp = regs->cp0_cause;
121 tmp = regs->cp0_badvaddr;
130 tmp = child->thread.fpu.fcr31;
133 /* implementation / version register */
134 tmp = boot_cpu_data.fpu_id;
136 case DSP_BASE ... DSP_BASE + 5: {
144 dregs = __get_dsp_regs(child);
145 tmp = dregs[addr - DSP_BASE];
154 tmp = child->thread.dsp.dspcontrol;
161 ret = put_user(tmp, (unsigned __user *) (unsigned long) data);
166 * Write 4 bytes into the other process' storage
167 * data is the 4 bytes that the user wants written
168 * addr is a pointer in the user's storage that contains an
169 * 8 byte address in the other process where the 4 bytes
170 * that is to be written
171 * (this is run in a 32-bit process looking at a 64-bit process)
172 * when I and D space are separate, these will need to be fixed.
174 case PTRACE_POKETEXT_3264:
175 case PTRACE_POKEDATA_3264: {
176 u32 __user * addrOthers;
178 /* Get the addr in the other process that we want to write into */
180 if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
183 if (ptrace_access_vm(child, (u64)addrOthers, &data,
185 FOLL_FORCE | FOLL_WRITE) == sizeof(data))
191 case PTRACE_POKEUSR: {
192 struct pt_regs *regs;
194 regs = task_pt_regs(child);
198 regs->regs[addr] = data;
199 /* System call number may have been changed */
201 mips_syscall_update_nr(child, regs);
202 else if (addr == 4 &&
203 mips_syscall_is_indirect(child, regs))
204 mips_syscall_update_nr(child, regs);
206 case FPR_BASE ... FPR_BASE + 31: {
207 union fpureg *fregs = get_fpu_regs(child);
209 if (!tsk_used_math(child)) {
210 /* FP not yet used */
211 memset(&child->thread.fpu, ~0,
212 sizeof(child->thread.fpu));
213 child->thread.fpu.fcr31 = 0;
215 if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
217 * The odd registers are actually the high
218 * order bits of the values stored in the even
221 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
225 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
229 regs->cp0_epc = data;
238 child->thread.fpu.fcr31 = data;
240 case DSP_BASE ... DSP_BASE + 5: {
248 dregs = __get_dsp_regs(child);
249 dregs[addr - DSP_BASE] = data;
257 child->thread.dsp.dspcontrol = data;
260 /* The rest are not allowed. */
268 ret = ptrace_getregs(child,
269 (struct user_pt_regs __user *) (__u64) data);
273 ret = ptrace_setregs(child,
274 (struct user_pt_regs __user *) (__u64) data);
277 case PTRACE_GETFPREGS:
278 ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data);
281 case PTRACE_SETFPREGS:
282 ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data);
285 case PTRACE_GET_THREAD_AREA:
286 ret = put_user(task_thread_info(child)->tp_value,
287 (unsigned int __user *) (unsigned long) data);
290 case PTRACE_GET_THREAD_AREA_3264:
291 ret = put_user(task_thread_info(child)->tp_value,
292 (unsigned long __user *) (unsigned long) data);
295 case PTRACE_GET_WATCH_REGS:
296 ret = ptrace_get_watch_regs(child,
297 (struct pt_watch_regs __user *) (unsigned long) addr);
300 case PTRACE_SET_WATCH_REGS:
301 ret = ptrace_set_watch_regs(child,
302 (struct pt_watch_regs __user *) (unsigned long) addr);
306 ret = compat_ptrace_request(child, request, addr, data);