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9216cd7231
The bug is from commit 2054f4af19 ("csky: bugfix gdb coredump error.")
We change the ELF_NGREG to ELF_NGREG - 2 to fit gdb&gcc define, but forgot
modify ptrace regset.
Now coredump use ELF_NRGEG to parse GPRs and ptrace use pt_regs_regset, so
there are two different reg_sets for userspace.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
320 lines
8.3 KiB
C
320 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/elf.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ptrace.h>
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#include <linux/regset.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/signal.h>
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#include <linux/smp.h>
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#include <linux/uaccess.h>
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#include <linux/user.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/asm-offsets.h>
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#include <abi/regdef.h>
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/* sets the trace bits. */
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#define TRACE_MODE_SI (1 << 14)
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#define TRACE_MODE_RUN 0
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#define TRACE_MODE_MASK ~(0x3 << 14)
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/*
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* Make sure the single step bit is not set.
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*/
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static void singlestep_disable(struct task_struct *tsk)
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{
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struct pt_regs *regs;
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regs = task_pt_regs(tsk);
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regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN;
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}
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static void singlestep_enable(struct task_struct *tsk)
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{
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struct pt_regs *regs;
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regs = task_pt_regs(tsk);
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regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI;
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}
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/*
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* Make sure the single step bit is set.
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*/
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void user_enable_single_step(struct task_struct *child)
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{
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singlestep_enable(child);
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}
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void user_disable_single_step(struct task_struct *child)
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{
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singlestep_disable(child);
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}
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enum csky_regset {
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REGSET_GPR,
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REGSET_FPR,
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};
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static int gpr_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct pt_regs *regs;
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regs = task_pt_regs(target);
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/* Abiv1 regs->tls is fake and we need sync here. */
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regs->tls = task_thread_info(target)->tp_value;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
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}
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static int gpr_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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struct pt_regs regs;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0, -1);
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if (ret)
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return ret;
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regs.sr = task_pt_regs(target)->sr;
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#ifdef CONFIG_CPU_HAS_HILO
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regs.dcsr = task_pt_regs(target)->dcsr;
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#endif
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task_thread_info(target)->tp_value = regs.tls;
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*task_pt_regs(target) = regs;
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return 0;
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}
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static int fpr_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
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#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
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int i;
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struct user_fp tmp = *regs;
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for (i = 0; i < 16; i++) {
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tmp.vr[i*4] = regs->vr[i*2];
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tmp.vr[i*4 + 1] = regs->vr[i*2 + 1];
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}
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for (i = 0; i < 32; i++)
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tmp.vr[64 + i] = regs->vr[32 + i];
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
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#else
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
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#endif
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}
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static int fpr_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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struct user_fp *regs = (struct user_fp *)&target->thread.user_fp;
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#if defined(CONFIG_CPU_HAS_FPUV2) && !defined(CONFIG_CPU_HAS_VDSP)
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int i;
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struct user_fp tmp;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tmp, 0, -1);
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*regs = tmp;
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for (i = 0; i < 16; i++) {
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regs->vr[i*2] = tmp.vr[i*4];
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regs->vr[i*2 + 1] = tmp.vr[i*4 + 1];
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}
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for (i = 0; i < 32; i++)
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regs->vr[32 + i] = tmp.vr[64 + i];
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#else
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
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#endif
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return ret;
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}
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static const struct user_regset csky_regsets[] = {
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[REGSET_GPR] = {
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.core_note_type = NT_PRSTATUS,
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.n = sizeof(struct pt_regs) / sizeof(u32),
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.size = sizeof(u32),
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.align = sizeof(u32),
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.get = &gpr_get,
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.set = &gpr_set,
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},
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[REGSET_FPR] = {
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.core_note_type = NT_PRFPREG,
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.n = sizeof(struct user_fp) / sizeof(u32),
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.size = sizeof(u32),
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.align = sizeof(u32),
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.get = &fpr_get,
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.set = &fpr_set,
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},
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};
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static const struct user_regset_view user_csky_view = {
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.name = "csky",
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.e_machine = ELF_ARCH,
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.regsets = csky_regsets,
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.n = ARRAY_SIZE(csky_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_csky_view;
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}
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void ptrace_disable(struct task_struct *child)
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{
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singlestep_disable(child);
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}
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long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data)
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{
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long ret = -EIO;
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switch (request) {
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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/*
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* If process's system calls is traces, do some corresponding handles in this
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* function before entering system call function and after exiting system call
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* function.
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*/
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asmlinkage void syscall_trace(int why, struct pt_regs *regs)
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{
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long saved_why;
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/*
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* Save saved_why, why is used to denote syscall entry/exit;
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* why = 0:entry, why = 1: exit
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*/
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saved_why = regs->regs[SYSTRACE_SAVENUM];
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regs->regs[SYSTRACE_SAVENUM] = why;
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ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
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? 0x80 : 0));
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/*
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* this isn't the same as continuing with a signal, but it will do
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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if (current->exit_code) {
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send_sig(current->exit_code, current, 1);
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current->exit_code = 0;
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}
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regs->regs[SYSTRACE_SAVENUM] = saved_why;
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}
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extern void show_stack(struct task_struct *task, unsigned long *stack);
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void show_regs(struct pt_regs *fp)
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{
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unsigned long *sp;
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unsigned char *tp;
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int i;
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pr_info("\nCURRENT PROCESS:\n\n");
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pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
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if (current->mm) {
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pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
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(int) current->mm->start_code,
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(int) current->mm->end_code,
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(int) current->mm->start_data,
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(int) current->mm->end_data,
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(int) current->mm->end_data,
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(int) current->mm->brk);
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pr_info("USER-STACK=%08x KERNEL-STACK=%08x\n\n",
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(int) current->mm->start_stack,
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(int) (((unsigned long) current) + 2 * PAGE_SIZE));
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}
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pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
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pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
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pr_info("SP: 0x%08lx\n", (long)fp);
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pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
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pr_info("PSR: 0x%08lx\n", (long)fp->sr);
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pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
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fp->a0, fp->a1, fp->a2, fp->a3);
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#if defined(__CSKYABIV2__)
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pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
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fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
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pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
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fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
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pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
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fp->regs[8], fp->regs[9], fp->lr);
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pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
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fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
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pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
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fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
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pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
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fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
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pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
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fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
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pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
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fp->rhi, fp->rlo);
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#else
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pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
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fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
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pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
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fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
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pr_info("r14: 0x%08lx r1: 0x%08lx r15: 0x%08lx\n",
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fp->regs[8], fp->regs[9], fp->lr);
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#endif
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pr_info("\nCODE:");
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tp = ((unsigned char *) fp->pc) - 0x20;
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tp += ((int)tp % 4) ? 2 : 0;
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for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
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if ((i % 0x10) == 0)
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pr_cont("\n%08x: ", (int) (tp + i));
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pr_cont("%08x ", (int) *sp++);
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}
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pr_cont("\n");
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pr_info("\nKERNEL STACK:");
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tp = ((unsigned char *) fp) - 0x40;
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for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
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if ((i % 0x10) == 0)
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pr_cont("\n%08x: ", (int) (tp + i));
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pr_cont("%08x ", (int) *sp++);
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}
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pr_cont("\n");
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show_stack(NULL, (unsigned long *)fp->regs[4]);
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return;
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}
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