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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 <linux/kdebug.h>
#include <linux/sched/debug.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
int show_unhandled_signals = 1;
/* 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_pagefault(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_pagefault);
VEC_INIT(VEC_TLBINVALIDS, csky_pagefault);
VEC_INIT(VEC_TLBMODIFIED, csky_pagefault);
#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
}
static DEFINE_SPINLOCK(die_lock);
void die(struct pt_regs *regs, const char *str)
{
static int die_counter;
int ret;
oops_enter();
spin_lock_irq(&die_lock);
console_verbose();
bust_spinlocks(1);
pr_emerg("%s [#%d]\n", str, ++die_counter);
print_modules();
show_regs(regs);
show_stack(current, (unsigned long *)regs->regs[4], KERN_INFO);
ret = notify_die(DIE_OOPS, str, regs, 0, trap_no(regs), SIGSEGV);
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
spin_unlock_irq(&die_lock);
oops_exit();
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
if (ret != NOTIFY_STOP)
do_exit(SIGSEGV);
}
void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
{
struct task_struct *tsk = current;
if (show_unhandled_signals && unhandled_signal(tsk, signo)
&& printk_ratelimit()) {
pr_info("%s[%d]: unhandled signal %d code 0x%x at 0x%08lx",
tsk->comm, task_pid_nr(tsk), signo, code, addr);
print_vma_addr(KERN_CONT " in ", instruction_pointer(regs));
pr_cont("\n");
show_regs(regs);
}
force_sig_fault(signo, code, (void __user *)addr);
}
static void do_trap_error(struct pt_regs *regs, int signo, int code,
unsigned long addr, const char *str)
{
current->thread.trap_no = trap_no(regs);
if (user_mode(regs)) {
do_trap(regs, signo, code, addr);
} else {
if (!fixup_exception(regs))
die(regs, str);
}
}
#define DO_ERROR_INFO(name, signo, code, str) \
asmlinkage __visible void name(struct pt_regs *regs) \
{ \
do_trap_error(regs, signo, code, regs->pc, "Oops - " str); \
}
DO_ERROR_INFO(do_trap_unknown,
SIGILL, ILL_ILLTRP, "unknown exception");
DO_ERROR_INFO(do_trap_zdiv,
SIGFPE, FPE_INTDIV, "error zero div exception");
DO_ERROR_INFO(do_trap_buserr,
SIGSEGV, ILL_ILLADR, "error bus error exception");
asmlinkage void do_trap_misaligned(struct pt_regs *regs)
{
#ifdef CONFIG_CPU_NEED_SOFTALIGN
csky_alignment(regs);
#else
current->thread.trap_no = trap_no(regs);
do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->pc,
"Oops - load/store address misaligned");
#endif
}
asmlinkage void do_trap_bkpt(struct pt_regs *regs)
{
#ifdef CONFIG_KPROBES
if (kprobe_single_step_handler(regs))
return;
#endif
#ifdef CONFIG_UPROBES
if (uprobe_single_step_handler(regs))
return;
#endif
if (user_mode(regs)) {
send_sig(SIGTRAP, current, 0);
return;
}
do_trap_error(regs, SIGILL, ILL_ILLTRP, regs->pc,
"Oops - illegal trap exception");
}
asmlinkage void do_trap_illinsn(struct pt_regs *regs)
{
current->thread.trap_no = trap_no(regs);
#ifdef CONFIG_KPROBES
if (kprobe_breakpoint_handler(regs))
return;
#endif
#ifdef CONFIG_UPROBES
if (uprobe_breakpoint_handler(regs))
return;
#endif
#ifndef CONFIG_CPU_NO_USER_BKPT
if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT) {
send_sig(SIGTRAP, current, 0);
return;
}
#endif
do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc,
"Oops - illegal instruction exception");
}
asmlinkage void do_trap_fpe(struct pt_regs *regs)
{
#ifdef CONFIG_CPU_HAS_FP
return fpu_fpe(regs);
#else
do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc,
"Oops - fpu instruction exception");
#endif
}
asmlinkage void do_trap_priv(struct pt_regs *regs)
{
#ifdef CONFIG_CPU_HAS_FP
if (user_mode(regs) && fpu_libc_helper(regs))
return;
#endif
do_trap_error(regs, SIGILL, ILL_PRVOPC, regs->pc,
"Oops - illegal privileged exception");
}
asmlinkage void trap_c(struct pt_regs *regs)
{
switch (trap_no(regs)) {
case VEC_ZERODIV:
do_trap_zdiv(regs);
break;
case VEC_TRACE:
do_trap_bkpt(regs);
break;
case VEC_ILLEGAL:
do_trap_illinsn(regs);
break;
case VEC_TRAP1:
case VEC_BREAKPOINT:
do_trap_bkpt(regs);
break;
case VEC_ACCESS:
do_trap_buserr(regs);
break;
case VEC_ALIGN:
do_trap_misaligned(regs);
break;
case VEC_FPE:
do_trap_fpe(regs);
break;
case VEC_PRIV:
do_trap_priv(regs);
break;
default:
do_trap_unknown(regs);
break;
}
}
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