diff options
Diffstat (limited to 'arch/csky/kernel/traps.c')
| -rw-r--r-- | arch/csky/kernel/traps.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/arch/csky/kernel/traps.c b/arch/csky/kernel/traps.c new file mode 100644 index 0000000000000..a8368ed43517c --- /dev/null +++ b/arch/csky/kernel/traps.c @@ -0,0 +1,169 @@ +// 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 <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); + + current->thread.esp0 = (unsigned long) regs; + force_sig_fault(SIGSEGV, 0, (void __user *)regs->pc, current); +} + +#define USR_BKPT 0x1464 +asmlinkage void trap_c(struct pt_regs *regs) +{ + int sig; + unsigned long vector; + siginfo_t info; + + vector = (mfcr("psr") >> 16) & 0xff; + + switch (vector) { + case VEC_ZERODIV: + sig = SIGFPE; + break; + /* ptrace */ + case VEC_TRACE: + info.si_code = TRAP_TRACE; + sig = SIGTRAP; + break; + case VEC_ILLEGAL: +#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: + info.si_code = TRAP_BRKPT; + sig = SIGTRAP; + break; + case VEC_ACCESS: + return buserr(regs); +#ifdef CONFIG_CPU_NEED_SOFTALIGN + case VEC_ALIGN: + return csky_alignment(regs); +#endif +#ifdef CONFIG_CPU_HAS_FPU + case VEC_FPE: + return fpu_fpe(regs); + case VEC_PRIV: + if (fpu_libc_helper(regs)) + return; +#endif + default: + sig = SIGSEGV; + break; + } + send_sig(sig, current, 0); +} + +asmlinkage void set_esp0(unsigned long ssp) +{ + current->thread.esp0 = ssp; +} |