mirror of
https://github.com/torvalds/linux
synced 2024-10-01 17:00:41 +00:00
csky: Debug and Ptrace GDB
This patch adds arch ptrace implementation, stack dump and bug.h. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren
parent
da55128194
commit
2ce36bfa6a
26
arch/csky/include/asm/bug.h
Normal file
26
arch/csky/include/asm/bug.h
Normal file
|
|
@ -0,0 +1,26 @@
|
|||
/* 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 */
|
||||
104
arch/csky/include/uapi/asm/ptrace.h
Normal file
104
arch/csky/include/uapi/asm/ptrace.h
Normal file
|
|
@ -0,0 +1,104 @@
|
|||
/* 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 */
|
||||
66
arch/csky/kernel/dumpstack.c
Normal file
66
arch/csky/kernel/dumpstack.c
Normal file
|
|
@ -0,0 +1,66 @@
|
|||
// 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);
|
||||
}
|
||||
314
arch/csky/kernel/ptrace.c
Normal file
314
arch/csky/kernel/ptrace.c
Normal file
|
|
@ -0,0 +1,314 @@
|
|||
// 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, ®s, 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");
|
||||
}
|
||||
Loading…
Reference in a new issue