Commit 2ce36bfa authored by Guo Ren's avatar Guo Ren
Browse files

csky: Debug and Ptrace GDB 



This patch adds arch ptrace implementation, stack dump and bug.h.

Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
parent da551281

arch/csky/include/asm/bug.h

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/* SPDX-License-Identifier: GPL-2.0 */

// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.



#ifndef __ASM_CSKY_BUG_H

#define __ASM_CSKY_BUG_H



#include <linux/compiler.h>

#include <linux/const.h>

#include <linux/types.h>



#define BUG()				\

do {					\

	asm volatile ("bkpt\n");	\

	unreachable();			\

} while (0)



#define HAVE_ARCH_BUG



#include <asm-generic/bug.h>



struct pt_regs;



void die_if_kernel(char *str, struct pt_regs *regs, int nr);

void show_regs(struct pt_regs *regs);



#endif /* __ASM_CSKY_BUG_H */

arch/csky/include/uapi/asm/ptrace.h

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/* SPDX-License-Identifier: GPL-2.0 */

// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.



#ifndef _CSKY_PTRACE_H

#define _CSKY_PTRACE_H



#ifndef __ASSEMBLY__



struct pt_regs {

	unsigned long	tls;

	unsigned long	lr;

	unsigned long	pc;

	unsigned long	sr;

	unsigned long	usp;



	/*

	 * a0, a1, a2, a3:

	 * abiv1: r2, r3, r4, r5

	 * abiv2: r0, r1, r2, r3

	 */

	unsigned long	orig_a0;

	unsigned long	a0;

	unsigned long	a1;

	unsigned long	a2;

	unsigned long	a3;



	/*

	 * ABIV2: r4 ~ r13

	 * ABIV1: r6 ~ r14, r1

	 */

	unsigned long	regs[10];



#if defined(__CSKYABIV2__)

	/* r16 ~ r30 */

	unsigned long	exregs[15];



	unsigned long	rhi;

	unsigned long	rlo;

	unsigned long	pad; /* reserved */

#endif

};



struct user_fp {

	unsigned long	vr[96];

	unsigned long	fcr;

	unsigned long	fesr;

	unsigned long	fid;

	unsigned long	reserved;

};



/*

 * Switch stack for switch_to after push pt_regs.

 *

 * ABI_CSKYV2: r4 ~ r11, r15 ~ r17, r26 ~ r30;

 * ABI_CSKYV1: r8 ~ r14, r15;

 */

struct  switch_stack {

#if defined(__CSKYABIV2__)

	unsigned long   r4;

	unsigned long   r5;

	unsigned long   r6;

	unsigned long   r7;

	unsigned long   r8;

	unsigned long   r9;

	unsigned long   r10;

	unsigned long   r11;

#else

	unsigned long   r8;

	unsigned long   r9;

	unsigned long   r10;

	unsigned long   r11;

	unsigned long   r12;

	unsigned long   r13;

	unsigned long   r14;

#endif

	unsigned long   r15;

#if defined(__CSKYABIV2__)

	unsigned long   r16;

	unsigned long   r17;

	unsigned long   r26;

	unsigned long   r27;

	unsigned long   r28;

	unsigned long   r29;

	unsigned long   r30;

#endif

};



#ifdef __KERNEL__



#define PS_S	0x80000000 /* Supervisor Mode */



#define arch_has_single_step() (1)

#define current_pt_regs() \

({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; })



#define user_stack_pointer(regs) ((regs)->usp)



#define user_mode(regs) (!((regs)->sr & PS_S))

#define instruction_pointer(regs) ((regs)->pc)

#define profile_pc(regs) instruction_pointer(regs)



#endif /* __KERNEL__ */

#endif /* __ASSEMBLY__ */

#endif /* _CSKY_PTRACE_H */

arch/csky/kernel/dumpstack.c

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// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.



#include <linux/ptrace.h>



int kstack_depth_to_print = 48;



void show_trace(unsigned long *stack)

{

	unsigned long *endstack;

	unsigned long addr;

	int i;



	pr_info("Call Trace:\n");

	addr = (unsigned long)stack + THREAD_SIZE - 1;

	endstack = (unsigned long *)(addr & -THREAD_SIZE);

	i = 0;

	while (stack + 1 <= endstack) {

		addr = *stack++;

		/*

		 * If the address is either in the text segment of the

		 * kernel, or in the region which contains vmalloc'ed

		 * memory, it *may* be the address of a calling

		 * routine; if so, print it so that someone tracing

		 * down the cause of the crash will be able to figure

		 * out the call path that was taken.

		 */

		if (__kernel_text_address(addr)) {

#ifndef CONFIG_KALLSYMS

			if (i % 5 == 0)

				pr_cont("\n       ");

#endif

			pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr);

			i++;

		}

	}

	pr_cont("\n");

}



void show_stack(struct task_struct *task, unsigned long *stack)

{

	unsigned long *p;

	unsigned long *endstack;

	int i;



	if (!stack) {

		if (task)

			stack = (unsigned long *)task->thread.esp0;

		else

			stack = (unsigned long *)&stack;

	}

	endstack = (unsigned long *)

		(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);



	pr_info("Stack from %08lx:", (unsigned long)stack);

	p = stack;

	for (i = 0; i < kstack_depth_to_print; i++) {

		if (p + 1 > endstack)

			break;

		if (i % 8 == 0)

			pr_cont("\n       ");

		pr_cont(" %08lx", *p++);

	}

	pr_cont("\n");

	show_trace(stack);

}

arch/csky/kernel/ptrace.c

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// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.



#include <linux/elf.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/ptrace.h>

#include <linux/regset.h>

#include <linux/sched.h>

#include <linux/signal.h>

#include <linux/smp.h>

#include <linux/uaccess.h>

#include <linux/user.h>



#include <asm/thread_info.h>

#include <asm/page.h>

#include <asm/pgtable.h>

#include <asm/processor.h>

#include <asm/asm-offsets.h>



#include <abi/regdef.h>



/* sets the trace bits. */

#define TRACE_MODE_SI      (1 << 14)

#define TRACE_MODE_RUN     0

#define TRACE_MODE_MASK    ~(0x3 << 14)



/*

 * Make sure the single step bit is not set.

 */

static void singlestep_disable(struct task_struct *tsk)

{

	struct pt_regs *regs;



	regs = task_pt_regs(tsk);

	regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;

}



static void singlestep_enable(struct task_struct *tsk)

{

	struct pt_regs *regs;



	regs = task_pt_regs(tsk);

	regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;

}



/*

 * Make sure the single step bit is set.

 */

void user_enable_single_step(struct task_struct *child)

{

	if (child->thread.esp0 == 0)

		return;

	singlestep_enable(child);

}



void user_disable_single_step(struct task_struct *child)

{

	if (child->thread.esp0 == 0)

		return;

	singlestep_disable(child);

}



enum csky_regset {

	REGSET_GPR,

	REGSET_FPR,

};



static int gpr_get(struct task_struct *target,

		   const struct user_regset *regset,

		   unsigned int pos, unsigned int count,

		   void *kbuf, void __user *ubuf)

{

	struct pt_regs *regs;



	regs = task_pt_regs(target);



	/* Abiv1 regs->tls is fake and we need sync here. */

	regs->tls = task_thread_info(target)->tp_value;



	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);

}



static int gpr_set(struct task_struct *target,

		    const struct user_regset *regset,

		    unsigned int pos, unsigned int count,

		    const void *kbuf, const void __user *ubuf)

{

	int ret;

	struct pt_regs regs;



	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0, -1);

	if (ret)

		return ret;



	regs.sr = task_pt_regs(target)->sr;



	task_thread_info(target)->tp_value = regs.tls;



	*task_pt_regs(target) = regs;



	return 0;

}



static int fpr_get(struct task_struct *target,

		   const struct user_regset *regset,

		   unsigned int pos, unsigned int count,

		   void *kbuf, void __user *ubuf)

{

	struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;



#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)

	int i;

	struct user_fp tmp = *regs;



	for (i = 0; i < 16; i++) {

		tmp.vr[i*4] = regs->vr[i*2];

		tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];

	}



	for (i = 0; i < 32; i++)

		tmp.vr[64 + i] = regs->vr[32 + i];



	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);

#else

	return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);

#endif

}



static int fpr_set(struct task_struct *target,

		   const struct user_regset *regset,

		   unsigned int pos, unsigned int count,

		   const void *kbuf, const void __user *ubuf)

{

	int ret;

	struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;



#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)

	int i;

	struct user_fp tmp;



	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);



	*regs = tmp;



	for (i = 0; i < 16; i++) {

		regs->vr[i*2] = tmp.vr[i*4];

		regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];

	}



	for (i = 0; i < 32; i++)

		regs->vr[32 + i] = tmp.vr[64 + i];

#else

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);

#endif



	return ret;

}



static const struct user_regset csky_regsets[] = {

	[REGSET_GPR] = {

		.core_note_type = NT_PRSTATUS,

		.n = ELF_NGREG,

		.size = sizeof(u32),

		.align = sizeof(u32),

		.get = &gpr_get,

		.set = &gpr_set,

	},

	[REGSET_FPR] = {

		.core_note_type = NT_PRFPREG,

		.n = sizeof(struct user_fp) / sizeof(u32),

		.size = sizeof(u32),

		.align = sizeof(u32),

		.get = &fpr_get,

		.set = &fpr_set,

	},

};



static const struct user_regset_view user_csky_view = {

	.name = "csky",

	.e_machine = ELF_ARCH,

	.regsets = csky_regsets,

	.n = ARRAY_SIZE(csky_regsets),

};



const struct user_regset_view *task_user_regset_view(struct task_struct *task)

{

	return &user_csky_view;

}



void ptrace_disable(struct task_struct *child)

{

	singlestep_disable(child);

}



long arch_ptrace(struct task_struct *child, long request,

		 unsigned long addr, unsigned long data)

{

	long ret = -EIO;



	switch (request) {

	default:

		ret = ptrace_request(child, request, addr, data);

		break;

	}



	return ret;

}



/*

 * If process's system calls is traces, do some corresponding handles in this

 * function before entering system call function and after exiting system call

 * function.

 */

asmlinkage void syscall_trace(int why, struct pt_regs *regs)

{

	long saved_why;

	/*

	 * Save saved_why, why is used to denote syscall entry/exit;

	 * why = 0:entry, why = 1: exit

	 */

	saved_why = regs->regs[SYSTRACE_SAVENUM];

	regs->regs[SYSTRACE_SAVENUM] = why;



	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)

					? 0x80 : 0));



	/*

	 * this isn't the same as continuing with a signal, but it will do

	 * for normal use.  strace only continues with a signal if the

	 * stopping signal is not SIGTRAP.  -brl

	 */

	if (current->exit_code) {

		send_sig(current->exit_code, current, 1);

		current->exit_code = 0;

	}



	regs->regs[SYSTRACE_SAVENUM] = saved_why;

}



void show_regs(struct pt_regs *fp)

{

	unsigned long   *sp;

	unsigned char   *tp;

	int	i;



	pr_info("\nCURRENT PROCESS:\n\n");

	pr_info("COMM=%s PID=%d\n", current->comm, current->pid);



	if (current->mm) {

		pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",

		       (int) current->mm->start_code,

		       (int) current->mm->end_code,

		       (int) current->mm->start_data,

		       (int) current->mm->end_data,

		       (int) current->mm->end_data,

		       (int) current->mm->brk);

		pr_info("USER-STACK=%08x  KERNEL-STACK=%08x\n\n",

		       (int) current->mm->start_stack,

		       (int) (((unsigned long) current) + 2 * PAGE_SIZE));

	}



	pr_info("PC: 0x%08lx\n", (long)fp->pc);

	pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);

	pr_info("PSR: 0x%08lx\n", (long)fp->sr);



	pr_info("a0: 0x%08lx  a1: 0x%08lx  a2: 0x%08lx  a3: 0x%08lx\n",

	       fp->a0, fp->a1, fp->a2, fp->a3);

#if defined(__CSKYABIV2__)

	pr_info("r4: 0x%08lx  r5: 0x%08lx    r6: 0x%08lx    r7: 0x%08lx\n",

		fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);

	pr_info("r8: 0x%08lx  r9: 0x%08lx   r10: 0x%08lx   r11: 0x%08lx\n",

		fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);

	pr_info("r12 0x%08lx  r13: 0x%08lx   r15: 0x%08lx\n",

		fp->regs[8], fp->regs[9], fp->lr);

	pr_info("r16:0x%08lx   r17: 0x%08lx   r18: 0x%08lx    r19: 0x%08lx\n",

		fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);

	pr_info("r20 0x%08lx   r21: 0x%08lx   r22: 0x%08lx    r23: 0x%08lx\n",

		fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);

	pr_info("r24 0x%08lx   r25: 0x%08lx   r26: 0x%08lx    r27: 0x%08lx\n",

		fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);

	pr_info("r28 0x%08lx   r29: 0x%08lx   r30: 0x%08lx    tls: 0x%08lx\n",

		fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);

	pr_info("hi 0x%08lx    lo: 0x%08lx\n",

		fp->rhi, fp->rlo);

#else

	pr_info("r6: 0x%08lx   r7: 0x%08lx   r8: 0x%08lx   r9: 0x%08lx\n",

		fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);

	pr_info("r10: 0x%08lx   r11: 0x%08lx   r12: 0x%08lx   r13: 0x%08lx\n",

		fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);

	pr_info("r14 0x%08lx   r1: 0x%08lx   r15: 0x%08lx\n",

		fp->regs[8], fp->regs[9], fp->lr);

#endif



	pr_info("\nCODE:");

	tp = ((unsigned char *) fp->pc) - 0x20;

	tp += ((int)tp % 4) ? 2 : 0;

	for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {

		if ((i % 0x10) == 0)

			pr_cont("\n%08x: ", (int) (tp + i));

		pr_cont("%08x ", (int) *sp++);

	}

	pr_cont("\n");



	pr_info("\nKERNEL STACK:");

	tp = ((unsigned char *) fp) - 0x40;

	for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {

		if ((i % 0x10) == 0)

			pr_cont("\n%08x: ", (int) (tp + i));

		pr_cont("%08x ", (int) *sp++);

	}

	pr_cont("\n");

}

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