1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #include <linux/audit.h>
6 #include <linux/errno.h>
7 #include <linux/kernel.h>
9 #include <linux/ptrace.h>
10 #include <linux/regset.h>
11 #include <linux/sched.h>
12 #include <linux/sched/task_stack.h>
13 #include <linux/signal.h>
14 #include <linux/smp.h>
15 #include <linux/tracehook.h>
16 #include <linux/uaccess.h>
17 #include <linux/user.h>
19 #include <asm/thread_info.h>
21 #include <asm/processor.h>
22 #include <asm/asm-offsets.h>
24 #include <abi/regdef.h>
25 #include <abi/ckmmu.h>
27 #define CREATE_TRACE_POINTS
28 #include <trace/events/syscalls.h>
30 /* sets the trace bits. */
31 #define TRACE_MODE_SI (1 << 14)
32 #define TRACE_MODE_RUN 0
33 #define TRACE_MODE_MASK ~(0x3 << 14)
36 * Make sure the single step bit is not set.
38 static void singlestep_disable(struct task_struct *tsk)
42 regs = task_pt_regs(tsk);
43 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;
49 static void singlestep_enable(struct task_struct *tsk)
53 regs = task_pt_regs(tsk);
54 regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;
61 * Make sure the single step bit is set.
63 void user_enable_single_step(struct task_struct *child)
65 singlestep_enable(child);
68 void user_disable_single_step(struct task_struct *child)
70 singlestep_disable(child);
78 static int gpr_get(struct task_struct *target,
79 const struct user_regset *regset,
82 struct pt_regs *regs = task_pt_regs(target);
84 /* Abiv1 regs->tls is fake and we need sync here. */
85 regs->tls = task_thread_info(target)->tp_value;
87 return membuf_write(&to, regs, sizeof(*regs));
90 static int gpr_set(struct task_struct *target,
91 const struct user_regset *regset,
92 unsigned int pos, unsigned int count,
93 const void *kbuf, const void __user *ubuf)
98 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0, -1);
102 regs.sr = task_pt_regs(target)->sr;
103 #ifdef CONFIG_CPU_HAS_HILO
104 regs.dcsr = task_pt_regs(target)->dcsr;
106 task_thread_info(target)->tp_value = regs.tls;
108 *task_pt_regs(target) = regs;
113 static int fpr_get(struct task_struct *target,
114 const struct user_regset *regset,
117 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
119 #if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
121 struct user_fp tmp = *regs;
123 for (i = 0; i < 16; i++) {
124 tmp.vr[i*4] = regs->vr[i*2];
125 tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];
128 for (i = 0; i < 32; i++)
129 tmp.vr[64 + i] = regs->vr[32 + i];
131 return membuf_write(&to, &tmp, sizeof(tmp));
133 return membuf_write(&to, regs, sizeof(*regs));
137 static int fpr_set(struct task_struct *target,
138 const struct user_regset *regset,
139 unsigned int pos, unsigned int count,
140 const void *kbuf, const void __user *ubuf)
143 struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
145 #if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
149 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
153 for (i = 0; i < 16; i++) {
154 regs->vr[i*2] = tmp.vr[i*4];
155 regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];
158 for (i = 0; i < 32; i++)
159 regs->vr[32 + i] = tmp.vr[64 + i];
161 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
167 static const struct user_regset csky_regsets[] = {
169 .core_note_type = NT_PRSTATUS,
170 .n = sizeof(struct pt_regs) / sizeof(u32),
172 .align = sizeof(u32),
173 .regset_get = gpr_get,
177 .core_note_type = NT_PRFPREG,
178 .n = sizeof(struct user_fp) / sizeof(u32),
180 .align = sizeof(u32),
181 .regset_get = fpr_get,
186 static const struct user_regset_view user_csky_view = {
188 .e_machine = ELF_ARCH,
189 .regsets = csky_regsets,
190 .n = ARRAY_SIZE(csky_regsets),
193 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
195 return &user_csky_view;
198 struct pt_regs_offset {
203 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
204 #define REG_OFFSET_END {.name = NULL, .offset = 0}
206 static const struct pt_regs_offset regoffset_table[] = {
207 REG_OFFSET_NAME(tls),
211 REG_OFFSET_NAME(usp),
212 REG_OFFSET_NAME(orig_a0),
217 REG_OFFSET_NAME(regs[0]),
218 REG_OFFSET_NAME(regs[1]),
219 REG_OFFSET_NAME(regs[2]),
220 REG_OFFSET_NAME(regs[3]),
221 REG_OFFSET_NAME(regs[4]),
222 REG_OFFSET_NAME(regs[5]),
223 REG_OFFSET_NAME(regs[6]),
224 REG_OFFSET_NAME(regs[7]),
225 REG_OFFSET_NAME(regs[8]),
226 REG_OFFSET_NAME(regs[9]),
227 #if defined(__CSKYABIV2__)
228 REG_OFFSET_NAME(exregs[0]),
229 REG_OFFSET_NAME(exregs[1]),
230 REG_OFFSET_NAME(exregs[2]),
231 REG_OFFSET_NAME(exregs[3]),
232 REG_OFFSET_NAME(exregs[4]),
233 REG_OFFSET_NAME(exregs[5]),
234 REG_OFFSET_NAME(exregs[6]),
235 REG_OFFSET_NAME(exregs[7]),
236 REG_OFFSET_NAME(exregs[8]),
237 REG_OFFSET_NAME(exregs[9]),
238 REG_OFFSET_NAME(exregs[10]),
239 REG_OFFSET_NAME(exregs[11]),
240 REG_OFFSET_NAME(exregs[12]),
241 REG_OFFSET_NAME(exregs[13]),
242 REG_OFFSET_NAME(exregs[14]),
243 REG_OFFSET_NAME(rhi),
244 REG_OFFSET_NAME(rlo),
245 REG_OFFSET_NAME(dcsr),
251 * regs_query_register_offset() - query register offset from its name
252 * @name: the name of a register
254 * regs_query_register_offset() returns the offset of a register in struct
255 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
257 int regs_query_register_offset(const char *name)
259 const struct pt_regs_offset *roff;
261 for (roff = regoffset_table; roff->name != NULL; roff++)
262 if (!strcmp(roff->name, name))
268 * regs_within_kernel_stack() - check the address in the stack
269 * @regs: pt_regs which contains kernel stack pointer.
270 * @addr: address which is checked.
272 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
273 * If @addr is within the kernel stack, it returns true. If not, returns false.
275 static bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
277 return (addr & ~(THREAD_SIZE - 1)) ==
278 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1));
282 * regs_get_kernel_stack_nth() - get Nth entry of the stack
283 * @regs: pt_regs which contains kernel stack pointer.
284 * @n: stack entry number.
286 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
287 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
290 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
292 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
295 if (regs_within_kernel_stack(regs, (unsigned long)addr))
301 void ptrace_disable(struct task_struct *child)
303 singlestep_disable(child);
306 long arch_ptrace(struct task_struct *child, long request,
307 unsigned long addr, unsigned long data)
313 ret = ptrace_request(child, request, addr, data);
320 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
322 if (test_thread_flag(TIF_SYSCALL_TRACE))
323 if (tracehook_report_syscall_entry(regs))
326 if (secure_computing() == -1)
329 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
330 trace_sys_enter(regs, syscall_get_nr(current, regs));
332 audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
336 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
338 audit_syscall_exit(regs);
340 if (test_thread_flag(TIF_SYSCALL_TRACE))
341 tracehook_report_syscall_exit(regs, 0);
343 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
344 trace_sys_exit(regs, syscall_get_return_value(current, regs));
347 #ifdef CONFIG_CPU_CK860
348 static void show_iutlb(void)
352 unsigned long oldpid;
353 unsigned long entryhi[16], entrylo0[16], entrylo1[16];
355 oldpid = read_mmu_entryhi();
359 local_irq_save(flags);
361 for (i = 0; i < 16; i++) {
362 write_mmu_index(entry);
364 entryhi[i] = read_mmu_entryhi();
365 entrylo0[i] = read_mmu_entrylo0();
366 entrylo1[i] = read_mmu_entrylo1();
371 local_irq_restore(flags);
373 write_mmu_entryhi(oldpid);
376 for (i = 0; i < 16; i++)
377 printk("iutlb[%d]: entryhi - 0x%lx; entrylo0 - 0x%lx;"
378 " entrylo1 - 0x%lx\n",
379 i, entryhi[i], entrylo0[i], entrylo1[i]);
383 static void show_dutlb(void)
387 unsigned long oldpid;
388 unsigned long entryhi[16], entrylo0[16], entrylo1[16];
390 oldpid = read_mmu_entryhi();
394 local_irq_save(flags);
396 for (i = 0; i < 16; i++) {
397 write_mmu_index(entry);
399 entryhi[i] = read_mmu_entryhi();
400 entrylo0[i] = read_mmu_entrylo0();
401 entrylo1[i] = read_mmu_entrylo1();
406 local_irq_restore(flags);
408 write_mmu_entryhi(oldpid);
411 for (i = 0; i < 16; i++)
412 printk("dutlb[%d]: entryhi - 0x%lx; entrylo0 - 0x%lx;"
413 " entrylo1 - 0x%lx\n",
414 i, entryhi[i], entrylo0[i], entrylo1[i]);
418 static unsigned long entryhi[1024], entrylo0[1024], entrylo1[1024];
419 static void show_jtlb(void)
423 unsigned long oldpid;
425 oldpid = read_mmu_entryhi();
429 local_irq_save(flags);
430 while (entry < 1024) {
431 write_mmu_index(entry);
433 entryhi[entry] = read_mmu_entryhi();
434 entrylo0[entry] = read_mmu_entrylo0();
435 entrylo1[entry] = read_mmu_entrylo1();
439 local_irq_restore(flags);
441 write_mmu_entryhi(oldpid);
445 for (entry = 0; entry < 1024; entry++)
446 printk("jtlb[%x]: entryhi - 0x%lx; entrylo0 - 0x%lx;"
447 " entrylo1 - 0x%lx\n",
448 entry, entryhi[entry], entrylo0[entry], entrylo1[entry]);
452 static void show_tlb(void)
459 static void show_tlb(void)
465 void show_regs(struct pt_regs *fp)
467 pr_info("\nCURRENT PROCESS:\n\n");
468 pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
471 pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
472 (int) current->mm->start_code,
473 (int) current->mm->end_code,
474 (int) current->mm->start_data,
475 (int) current->mm->end_data,
476 (int) current->mm->end_data,
477 (int) current->mm->brk);
478 pr_info("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
479 (int) current->mm->start_stack,
480 (int) (((unsigned long) current) + 2 * PAGE_SIZE));
483 pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
484 pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
485 pr_info("SP: 0x%08lx\n", (long)fp->usp);
486 pr_info("PSR: 0x%08lx\n", (long)fp->sr);
487 pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
488 pr_info("PT_REGS: 0x%08lx\n", (long)fp);
490 pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
491 fp->a0, fp->a1, fp->a2, fp->a3);
492 #if defined(__CSKYABIV2__)
493 pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
494 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
495 pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
496 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
497 pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
498 fp->regs[8], fp->regs[9], fp->lr);
499 pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
500 fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
501 pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
502 fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
503 pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
504 fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
505 pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
506 fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
507 pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
510 pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
511 fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
512 pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
513 fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
514 pr_info("r14: 0x%08lx r1: 0x%08lx\n",
515 fp->regs[8], fp->regs[9]);