From 2ce36bfa6a0904524baed699ad78706e50295f84 Mon Sep 17 00:00:00 2001 From: Guo Ren Date: Wed, 5 Sep 2018 14:25:19 +0800 Subject: [PATCH] csky: Debug and Ptrace GDB This patch adds arch ptrace implementation, stack dump and bug.h. Signed-off-by: Guo Ren Reviewed-by: Arnd Bergmann --- arch/csky/include/asm/bug.h | 26 +++ arch/csky/include/uapi/asm/ptrace.h | 104 +++++++++ arch/csky/kernel/dumpstack.c | 66 ++++++ arch/csky/kernel/ptrace.c | 314 ++++++++++++++++++++++++++++ 4 files changed, 510 insertions(+) create mode 100644 arch/csky/include/asm/bug.h create mode 100644 arch/csky/include/uapi/asm/ptrace.h create mode 100644 arch/csky/kernel/dumpstack.c create mode 100644 arch/csky/kernel/ptrace.c diff --git a/arch/csky/include/asm/bug.h b/arch/csky/include/asm/bug.h new file mode 100644 index 000000000000..bd7b3235bb84 --- /dev/null +++ b/arch/csky/include/asm/bug.h @@ -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 +#include +#include + +#define BUG() \ +do { \ + asm volatile ("bkpt\n"); \ + unreachable(); \ +} while (0) + +#define HAVE_ARCH_BUG + +#include + +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 */ diff --git a/arch/csky/include/uapi/asm/ptrace.h b/arch/csky/include/uapi/asm/ptrace.h new file mode 100644 index 000000000000..f10d02c8b09e --- /dev/null +++ b/arch/csky/include/uapi/asm/ptrace.h @@ -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 */ diff --git a/arch/csky/kernel/dumpstack.c b/arch/csky/kernel/dumpstack.c new file mode 100644 index 000000000000..a9a03ac57ec5 --- /dev/null +++ b/arch/csky/kernel/dumpstack.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include + +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); +} diff --git a/arch/csky/kernel/ptrace.c b/arch/csky/kernel/ptrace.c new file mode 100644 index 000000000000..34b30257298f --- /dev/null +++ b/arch/csky/kernel/ptrace.c @@ -0,0 +1,314 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include + +/* 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"); +}