// 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;
#ifdef CONFIG_CPU_HAS_HILO
regs.dcsr = task_pt_regs(target)->dcsr;
#endif
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");
}
