mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
262 lines
5.6 KiB
262 lines
5.6 KiB
// 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; |
|
} |
|
}
|
|
|