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Diffstat (limited to 'arch/nds32/kernel/traps.c')
-rw-r--r--arch/nds32/kernel/traps.c354
1 files changed, 0 insertions, 354 deletions
diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
deleted file mode 100644
index c0a8f3344fb9..000000000000
--- a/arch/nds32/kernel/traps.c
+++ /dev/null
@@ -1,354 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2005-2017 Andes Technology Corporation
-
-#include <linux/module.h>
-#include <linux/personality.h>
-#include <linux/kallsyms.h>
-#include <linux/hardirq.h>
-#include <linux/kdebug.h>
-#include <linux/sched/task_stack.h>
-#include <linux/uaccess.h>
-#include <linux/ftrace.h>
-
-#include <asm/proc-fns.h>
-#include <asm/unistd.h>
-#include <asm/fpu.h>
-
-#include <linux/ptrace.h>
-#include <nds32_intrinsic.h>
-
-extern void show_pte(struct mm_struct *mm, unsigned long addr);
-
-/*
- * Dump out the contents of some memory nicely...
- */
-void dump_mem(const char *lvl, unsigned long bottom, unsigned long top)
-{
- unsigned long first;
- int i;
-
- pr_emerg("%s(0x%08lx to 0x%08lx)\n", lvl, bottom, top);
-
- for (first = bottom & ~31; first < top; first += 32) {
- unsigned long p;
- char str[sizeof(" 12345678") * 8 + 1];
-
- memset(str, ' ', sizeof(str));
- str[sizeof(str) - 1] = '\0';
-
- for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
- if (p >= bottom && p < top) {
- unsigned long val;
-
- if (get_kernel_nofault(val,
- (unsigned long *)p) == 0)
- sprintf(str + i * 9, " %08lx", val);
- else
- sprintf(str + i * 9, " ????????");
- }
- }
- pr_emerg("%s%04lx:%s\n", lvl, first & 0xffff, str);
- }
-}
-
-EXPORT_SYMBOL(dump_mem);
-
-#define LOOP_TIMES (100)
-static void __dump(struct task_struct *tsk, unsigned long *base_reg,
- const char *loglvl)
-{
- unsigned long ret_addr;
- int cnt = LOOP_TIMES, graph = 0;
- printk("%sCall Trace:\n", loglvl);
- if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
- while (!kstack_end(base_reg)) {
- ret_addr = *base_reg++;
- if (__kernel_text_address(ret_addr)) {
- ret_addr = ftrace_graph_ret_addr(
- tsk, &graph, ret_addr, NULL);
- print_ip_sym(loglvl, ret_addr);
- }
- if (--cnt < 0)
- break;
- }
- } else {
- while (!kstack_end((void *)base_reg) &&
- !((unsigned long)base_reg & 0x3) &&
- ((unsigned long)base_reg >= TASK_SIZE)) {
- unsigned long next_fp;
- ret_addr = base_reg[LP_OFFSET];
- next_fp = base_reg[FP_OFFSET];
- if (__kernel_text_address(ret_addr)) {
-
- ret_addr = ftrace_graph_ret_addr(
- tsk, &graph, ret_addr, NULL);
- print_ip_sym(loglvl, ret_addr);
- }
- if (--cnt < 0)
- break;
- base_reg = (unsigned long *)next_fp;
- }
- }
- printk("%s\n", loglvl);
-}
-
-void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl)
-{
- unsigned long *base_reg;
-
- if (!tsk)
- tsk = current;
- if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
- if (tsk != current)
- base_reg = (unsigned long *)(tsk->thread.cpu_context.sp);
- else
- __asm__ __volatile__("\tori\t%0, $sp, #0\n":"=r"(base_reg));
- } else {
- if (tsk != current)
- base_reg = (unsigned long *)(tsk->thread.cpu_context.fp);
- else
- __asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(base_reg));
- }
- __dump(tsk, base_reg, loglvl);
- barrier();
-}
-
-DEFINE_SPINLOCK(die_lock);
-
-/*
- * This function is protected against re-entrancy.
- */
-void __noreturn die(const char *str, struct pt_regs *regs, int err)
-{
- struct task_struct *tsk = current;
- static int die_counter;
-
- console_verbose();
- spin_lock_irq(&die_lock);
- bust_spinlocks(1);
-
- pr_emerg("Internal error: %s: %x [#%d]\n", str, err, ++die_counter);
- print_modules();
- pr_emerg("CPU: %i\n", smp_processor_id());
- show_regs(regs);
- pr_emerg("Process %s (pid: %d, stack limit = 0x%p)\n",
- tsk->comm, tsk->pid, end_of_stack(tsk));
-
- if (!user_mode(regs) || in_interrupt()) {
- dump_mem("Stack: ", regs->sp, (regs->sp + PAGE_SIZE) & PAGE_MASK);
- dump_stack();
- }
-
- bust_spinlocks(0);
- spin_unlock_irq(&die_lock);
- make_task_dead(SIGSEGV);
-}
-
-EXPORT_SYMBOL(die);
-
-void die_if_kernel(const char *str, struct pt_regs *regs, int err)
-{
- if (user_mode(regs))
- return;
-
- die(str, regs, err);
-}
-
-int bad_syscall(int n, struct pt_regs *regs)
-{
- if (current->personality != PER_LINUX) {
- send_sig(SIGSEGV, current, 1);
- return regs->uregs[0];
- }
-
- force_sig_fault(SIGILL, ILL_ILLTRP,
- (void __user *)instruction_pointer(regs) - 4);
- die_if_kernel("Oops - bad syscall", regs, n);
- return regs->uregs[0];
-}
-
-void __pte_error(const char *file, int line, unsigned long val)
-{
- pr_emerg("%s:%d: bad pte %08lx.\n", file, line, val);
-}
-
-void __pmd_error(const char *file, int line, unsigned long val)
-{
- pr_emerg("%s:%d: bad pmd %08lx.\n", file, line, val);
-}
-
-void __pgd_error(const char *file, int line, unsigned long val)
-{
- pr_emerg("%s:%d: bad pgd %08lx.\n", file, line, val);
-}
-
-extern char *exception_vector, *exception_vector_end;
-void __init early_trap_init(void)
-{
- unsigned long ivb = 0;
- unsigned long base = PAGE_OFFSET;
-
- memcpy((unsigned long *)base, (unsigned long *)&exception_vector,
- ((unsigned long)&exception_vector_end -
- (unsigned long)&exception_vector));
- ivb = __nds32__mfsr(NDS32_SR_IVB);
- /* Check platform support. */
- if (((ivb & IVB_mskNIVIC) >> IVB_offNIVIC) < 2)
- panic
- ("IVIC mode is not allowed on the platform with interrupt controller\n");
- __nds32__mtsr((ivb & ~IVB_mskESZ) | (IVB_valESZ16 << IVB_offESZ) |
- IVB_BASE, NDS32_SR_IVB);
- __nds32__mtsr(INT_MASK_INITAIAL_VAL, NDS32_SR_INT_MASK);
-
- /*
- * 0x800 = 128 vectors * 16byte.
- * It should be enough to flush a page.
- */
- cpu_cache_wbinval_page(base, true);
-}
-
-static void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
-{
- struct task_struct *tsk = current;
-
- tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
- tsk->thread.error_code = error_code;
-
- force_sig_fault(SIGTRAP, si_code,
- (void __user *)instruction_pointer(regs));
-}
-
-void do_debug_trap(unsigned long entry, unsigned long addr,
- unsigned long type, struct pt_regs *regs)
-{
- if (notify_die(DIE_OOPS, "Oops", regs, addr, type, SIGTRAP)
- == NOTIFY_STOP)
- return;
-
- if (user_mode(regs)) {
- /* trap_signal */
- send_sigtrap(regs, 0, TRAP_BRKPT);
- } else {
- /* kernel_trap */
- if (!fixup_exception(regs))
- die("unexpected kernel_trap", regs, 0);
- }
-}
-
-void unhandled_interruption(struct pt_regs *regs)
-{
- pr_emerg("unhandled_interruption\n");
- show_regs(regs);
- if (!user_mode(regs))
- make_task_dead(SIGKILL);
- force_sig(SIGKILL);
-}
-
-void unhandled_exceptions(unsigned long entry, unsigned long addr,
- unsigned long type, struct pt_regs *regs)
-{
- pr_emerg("Unhandled Exception: entry: %lx addr:%lx itype:%lx\n", entry,
- addr, type);
- show_regs(regs);
- if (!user_mode(regs))
- make_task_dead(SIGKILL);
- force_sig(SIGKILL);
-}
-
-extern int do_page_fault(unsigned long entry, unsigned long addr,
- unsigned int error_code, struct pt_regs *regs);
-
-/*
- * 2:DEF dispatch for TLB MISC exception handler
-*/
-
-void do_dispatch_tlb_misc(unsigned long entry, unsigned long addr,
- unsigned long type, struct pt_regs *regs)
-{
- type = type & (ITYPE_mskINST | ITYPE_mskETYPE);
- if ((type & ITYPE_mskETYPE) < 5) {
- /* Permission exceptions */
- do_page_fault(entry, addr, type, regs);
- } else
- unhandled_exceptions(entry, addr, type, regs);
-}
-
-void do_revinsn(struct pt_regs *regs)
-{
- pr_emerg("Reserved Instruction\n");
- show_regs(regs);
- if (!user_mode(regs))
- make_task_dead(SIGILL);
- force_sig(SIGILL);
-}
-
-#ifdef CONFIG_ALIGNMENT_TRAP
-extern int unalign_access_mode;
-extern int do_unaligned_access(unsigned long addr, struct pt_regs *regs);
-#endif
-void do_dispatch_general(unsigned long entry, unsigned long addr,
- unsigned long itype, struct pt_regs *regs,
- unsigned long oipc)
-{
- unsigned int swid = itype >> ITYPE_offSWID;
- unsigned long type = itype & (ITYPE_mskINST | ITYPE_mskETYPE);
- if (type == ETYPE_ALIGNMENT_CHECK) {
-#ifdef CONFIG_ALIGNMENT_TRAP
- /* Alignment check */
- if (user_mode(regs) && unalign_access_mode) {
- int ret;
- ret = do_unaligned_access(addr, regs);
-
- if (ret == 0)
- return;
-
- if (ret == -EFAULT)
- pr_emerg
- ("Unhandled unaligned access exception\n");
- }
-#endif
- do_page_fault(entry, addr, type, regs);
- } else if (type == ETYPE_RESERVED_INSTRUCTION) {
- /* Reserved instruction */
- do_revinsn(regs);
- } else if (type == ETYPE_COPROCESSOR) {
- /* Coprocessor */
-#if IS_ENABLED(CONFIG_FPU)
- unsigned int fucop_exist = __nds32__mfsr(NDS32_SR_FUCOP_EXIST);
- unsigned int cpid = ((itype & ITYPE_mskCPID) >> ITYPE_offCPID);
-
- if ((cpid == FPU_CPID) &&
- (fucop_exist & FUCOP_EXIST_mskCP0ISFPU)) {
- unsigned int subtype = (itype & ITYPE_mskSTYPE);
-
- if (true == do_fpu_exception(subtype, regs))
- return;
- }
-#endif
- unhandled_exceptions(entry, addr, type, regs);
- } else if (type == ETYPE_TRAP && swid == SWID_RAISE_INTERRUPT_LEVEL) {
- /* trap, used on v3 EDM target debugging workaround */
- /*
- * DIPC(OIPC) is passed as parameter before
- * interrupt is enabled, so the DIPC will not be corrupted
- * even though interrupts are coming in
- */
- /*
- * 1. update ipc
- * 2. update pt_regs ipc with oipc
- * 3. update pt_regs ipsw (clear DEX)
- */
- __asm__ volatile ("mtsr %0, $IPC\n\t"::"r" (oipc));
- regs->ipc = oipc;
- if (regs->pipsw & PSW_mskDEX) {
- pr_emerg
- ("Nested Debug exception is possibly happened\n");
- pr_emerg("ipc:%08x pipc:%08x\n",
- (unsigned int)regs->ipc,
- (unsigned int)regs->pipc);
- }
- do_debug_trap(entry, addr, itype, regs);
- regs->ipsw &= ~PSW_mskDEX;
- } else
- unhandled_exceptions(entry, addr, type, regs);
-}