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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/user.h>
#include <linux/string.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/kallsyms.h>
#include <linux/rtc.h>
#include <linux/uaccess.h>
#include <linux/kprobes.h>
#include <asm/setup.h>
#include <asm/traps.h>
#include <asm/pgalloc.h>
#include <asm/siginfo.h>
#include <asm/mmu_context.h>
#ifdef CONFIG_CPU_HAS_FPU
#include <abi/fpu.h>
#endif
/* Defined in entry.S */
asmlinkage void csky_trap(void);
asmlinkage void csky_systemcall(void);
asmlinkage void csky_cmpxchg(void);
asmlinkage void csky_get_tls(void);
asmlinkage void csky_irq(void);
asmlinkage void csky_tlbinvalidl(void);
asmlinkage void csky_tlbinvalids(void);
asmlinkage void csky_tlbmodified(void);
/* Defined in head.S */
asmlinkage void _start_smp_secondary(void);
void __init pre_trap_init(void)
{
int i;
mtcr("vbr", vec_base);
for (i = 1; i < 128; i++)
VEC_INIT(i, csky_trap);
}
void __init trap_init(void)
{
VEC_INIT(VEC_AUTOVEC, csky_irq);
/* setup trap0 trap2 trap3 */
VEC_INIT(VEC_TRAP0, csky_systemcall);
VEC_INIT(VEC_TRAP2, csky_cmpxchg);
VEC_INIT(VEC_TRAP3, csky_get_tls);
/* setup MMU TLB exception */
VEC_INIT(VEC_TLBINVALIDL, csky_tlbinvalidl);
VEC_INIT(VEC_TLBINVALIDS, csky_tlbinvalids);
VEC_INIT(VEC_TLBMODIFIED, csky_tlbmodified);
#ifdef CONFIG_CPU_HAS_FPU
init_fpu();
#endif
#ifdef CONFIG_SMP
mtcr("cr<28, 0>", virt_to_phys(vec_base));
VEC_INIT(VEC_RESET, (void *)virt_to_phys(_start_smp_secondary));
#endif
}
void die_if_kernel(char *str, struct pt_regs *regs, int nr)
{
if (user_mode(regs))
return;
console_verbose();
pr_err("%s: %08x\n", str, nr);
show_regs(regs);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
do_exit(SIGSEGV);
}
void buserr(struct pt_regs *regs)
{
#ifdef CONFIG_CPU_CK810
static unsigned long prev_pc;
if ((regs->pc == prev_pc) && prev_pc != 0) {
prev_pc = 0;
} else {
prev_pc = regs->pc;
return;
}
#endif
die_if_kernel("Kernel mode BUS error", regs, 0);
pr_err("User mode Bus Error\n");
show_regs(regs);
force_sig_fault(SIGSEGV, 0, (void __user *)regs->pc);
}
asmlinkage void trap_c(struct pt_regs *regs)
{
int sig;
unsigned long vector;
siginfo_t info;
struct task_struct *tsk = current;
vector = (regs->sr >> 16) & 0xff;
switch (vector) {
case VEC_ZERODIV:
die_if_kernel("Kernel mode ZERO DIV", regs, vector);
sig = SIGFPE;
break;
/* ptrace */
case VEC_TRACE:
#ifdef CONFIG_KPROBES
if (kprobe_single_step_handler(regs))
return;
#endif
#ifdef CONFIG_UPROBES
if (uprobe_single_step_handler(regs))
return;
#endif
info.si_code = TRAP_TRACE;
sig = SIGTRAP;
break;
case VEC_ILLEGAL:
tsk->thread.trap_no = vector;
#ifdef CONFIG_KPROBES
if (kprobe_breakpoint_handler(regs))
return;
#endif
#ifdef CONFIG_UPROBES
if (uprobe_breakpoint_handler(regs))
return;
#endif
die_if_kernel("Kernel mode ILLEGAL", regs, vector);
#ifndef CONFIG_CPU_NO_USER_BKPT
if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT)
#endif
{
sig = SIGILL;
break;
}
/* gdbserver breakpoint */
case VEC_TRAP1:
/* jtagserver breakpoint */
case VEC_BREAKPOINT:
die_if_kernel("Kernel mode BKPT", regs, vector);
info.si_code = TRAP_BRKPT;
sig = SIGTRAP;
break;
case VEC_ACCESS:
tsk->thread.trap_no = vector;
return buserr(regs);
#ifdef CONFIG_CPU_NEED_SOFTALIGN
case VEC_ALIGN:
tsk->thread.trap_no = vector;
return csky_alignment(regs);
#endif
#ifdef CONFIG_CPU_HAS_FPU
case VEC_FPE:
tsk->thread.trap_no = vector;
die_if_kernel("Kernel mode FPE", regs, vector);
return fpu_fpe(regs);
case VEC_PRIV:
tsk->thread.trap_no = vector;
die_if_kernel("Kernel mode PRIV", regs, vector);
if (fpu_libc_helper(regs))
return;
#endif
default:
sig = SIGSEGV;
break;
}
tsk->thread.trap_no = vector;
send_sig(sig, current, 0);
}
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