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f39015504e
When compiling with W=1 enabling -Wmissing-prototypes the compiler warns: arch/openrisc/kernel/traps.c:146:6: error: no previous prototype for 'nommu_dump_state' [-Werror=missing-prototypes] This function is not used so remove it. Reported-by: Arnd Bergmann <arnd@arndb.de> Closes: https://lore.kernel.org/linux-kernel/20230810141947.1236730-17-arnd@kernel.org/ Signed-off-by: Stafford Horne <shorne@gmail.com>
428 lines
10 KiB
C
428 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OpenRISC traps.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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*
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* Here we handle the break vectors not used by the system call
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* mechanism, as well as some general stack/register dumping
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* things.
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/kernel.h>
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#include <linux/extable.h>
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#include <linux/kmod.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <asm/bug.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <asm/unwinder.h>
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#include <asm/sections.h>
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int lwa_flag;
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static unsigned long __user *lwa_addr;
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asmlinkage void unhandled_exception(struct pt_regs *regs, int ea, int vector);
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asmlinkage void do_trap(struct pt_regs *regs, unsigned long address);
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asmlinkage void do_fpe_trap(struct pt_regs *regs, unsigned long address);
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asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address);
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asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address);
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asmlinkage void do_illegal_instruction(struct pt_regs *regs,
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unsigned long address);
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static void print_trace(void *data, unsigned long addr, int reliable)
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{
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const char *loglvl = data;
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printk("%s[<%p>] %s%pS\n", loglvl, (void *) addr, reliable ? "" : "? ",
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(void *) addr);
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}
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static void print_data(unsigned long base_addr, unsigned long word, int i)
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{
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if (i == 0)
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printk("(%08lx:)\t%08lx", base_addr + (i * 4), word);
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else
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printk(" %08lx:\t%08lx", base_addr + (i * 4), word);
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}
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/* displays a short stack trace */
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void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
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{
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if (esp == NULL)
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esp = (unsigned long *)&esp;
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printk("%sCall trace:\n", loglvl);
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unwind_stack((void *)loglvl, esp, print_trace);
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}
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void show_registers(struct pt_regs *regs)
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{
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int i;
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int in_kernel = 1;
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unsigned long esp;
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esp = (unsigned long)(regs->sp);
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if (user_mode(regs))
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in_kernel = 0;
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printk("CPU #: %d\n"
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" PC: %08lx SR: %08lx SP: %08lx FPCSR: %08lx\n",
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smp_processor_id(), regs->pc, regs->sr, regs->sp,
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regs->fpcsr);
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printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
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0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
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printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
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regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
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printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
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regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
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printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
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regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
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printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
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regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
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printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
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regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
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printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
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regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
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printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
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regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
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printk(" RES: %08lx oGPR11: %08lx\n",
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regs->gpr[11], regs->orig_gpr11);
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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current->comm, current->pid, (unsigned long)current);
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/*
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* When in-kernel, we also print out the stack and code at the
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* time of the fault..
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*/
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if (in_kernel) {
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printk("\nStack: ");
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show_stack(NULL, (unsigned long *)esp, KERN_EMERG);
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if (esp < PAGE_OFFSET)
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goto bad_stack;
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printk("\n");
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for (i = -8; i < 24; i += 1) {
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unsigned long word;
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if (__get_user(word, &((unsigned long *)esp)[i])) {
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bad_stack:
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printk(" Bad Stack value.");
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break;
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}
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print_data(esp, word, i);
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}
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printk("\nCode: ");
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if (regs->pc < PAGE_OFFSET)
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goto bad;
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for (i = -6; i < 6; i += 1) {
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unsigned long word;
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if (__get_user(word, &((unsigned long *)regs->pc)[i])) {
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bad:
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printk(" Bad PC value.");
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break;
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}
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print_data(regs->pc, word, i);
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}
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}
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printk("\n");
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}
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/* This is normally the 'Oops' routine */
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void __noreturn die(const char *str, struct pt_regs *regs, long err)
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{
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console_verbose();
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printk("\n%s#: %04lx\n", str, err & 0xffff);
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show_registers(regs);
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#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
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printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
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/* shut down interrupts */
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local_irq_disable();
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__asm__ __volatile__("l.nop 1");
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do {} while (1);
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#endif
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make_task_dead(SIGSEGV);
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}
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asmlinkage void unhandled_exception(struct pt_regs *regs, int ea, int vector)
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{
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printk("Unable to handle exception at EA =0x%x, vector 0x%x",
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ea, vector);
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die("Oops", regs, 9);
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}
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asmlinkage void do_fpe_trap(struct pt_regs *regs, unsigned long address)
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{
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int code = FPE_FLTUNK;
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unsigned long fpcsr = regs->fpcsr;
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if (fpcsr & SPR_FPCSR_IVF)
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code = FPE_FLTINV;
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else if (fpcsr & SPR_FPCSR_OVF)
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code = FPE_FLTOVF;
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else if (fpcsr & SPR_FPCSR_UNF)
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code = FPE_FLTUND;
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else if (fpcsr & SPR_FPCSR_DZF)
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code = FPE_FLTDIV;
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else if (fpcsr & SPR_FPCSR_IXF)
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code = FPE_FLTRES;
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/* Clear all flags */
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regs->fpcsr &= ~SPR_FPCSR_ALLF;
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force_sig_fault(SIGFPE, code, (void __user *)regs->pc);
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}
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asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
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{
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force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
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}
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asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
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{
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if (user_mode(regs)) {
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/* Send a SIGBUS */
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force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
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} else {
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printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
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{
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if (user_mode(regs)) {
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/* Send a SIGBUS */
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force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
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} else { /* Kernel mode */
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printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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static inline int in_delay_slot(struct pt_regs *regs)
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{
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#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
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/* No delay slot flag, do the old way */
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unsigned int op, insn;
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insn = *((unsigned int *)regs->pc);
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op = insn >> 26;
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switch (op) {
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case 0x00: /* l.j */
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case 0x01: /* l.jal */
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case 0x03: /* l.bnf */
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case 0x04: /* l.bf */
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case 0x11: /* l.jr */
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case 0x12: /* l.jalr */
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return 1;
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default:
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return 0;
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}
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#else
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return mfspr(SPR_SR) & SPR_SR_DSX;
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#endif
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}
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static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
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{
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int displacement;
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unsigned int rb, op, jmp;
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if (unlikely(in_delay_slot(regs))) {
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/* In delay slot, instruction at pc is a branch, simulate it */
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jmp = *((unsigned int *)regs->pc);
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displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
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rb = (jmp & 0x0000ffff) >> 11;
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op = jmp >> 26;
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switch (op) {
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case 0x00: /* l.j */
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regs->pc += displacement;
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return;
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case 0x01: /* l.jal */
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regs->pc += displacement;
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regs->gpr[9] = regs->pc + 8;
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return;
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case 0x03: /* l.bnf */
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if (regs->sr & SPR_SR_F)
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regs->pc += 8;
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else
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regs->pc += displacement;
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return;
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case 0x04: /* l.bf */
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if (regs->sr & SPR_SR_F)
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regs->pc += displacement;
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else
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regs->pc += 8;
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return;
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case 0x11: /* l.jr */
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regs->pc = regs->gpr[rb];
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return;
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case 0x12: /* l.jalr */
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regs->pc = regs->gpr[rb];
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regs->gpr[9] = regs->pc + 8;
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return;
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default:
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break;
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}
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} else {
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regs->pc += 4;
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}
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}
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static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
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unsigned int insn)
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{
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unsigned int ra, rd;
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unsigned long value;
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unsigned long orig_pc;
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long imm;
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const struct exception_table_entry *entry;
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orig_pc = regs->pc;
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adjust_pc(regs, address);
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ra = (insn >> 16) & 0x1f;
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rd = (insn >> 21) & 0x1f;
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imm = (short)insn;
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lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
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if ((unsigned long)lwa_addr & 0x3) {
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do_unaligned_access(regs, address);
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return;
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}
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if (get_user(value, lwa_addr)) {
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if (user_mode(regs)) {
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force_sig(SIGSEGV);
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return;
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}
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if ((entry = search_exception_tables(orig_pc))) {
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regs->pc = entry->fixup;
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return;
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}
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/* kernel access in kernel space, load it directly */
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value = *((unsigned long *)lwa_addr);
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}
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lwa_flag = 1;
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regs->gpr[rd] = value;
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}
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static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
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unsigned int insn)
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{
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unsigned long __user *vaddr;
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unsigned long orig_pc;
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unsigned int ra, rb;
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long imm;
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const struct exception_table_entry *entry;
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orig_pc = regs->pc;
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adjust_pc(regs, address);
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ra = (insn >> 16) & 0x1f;
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rb = (insn >> 11) & 0x1f;
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imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
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vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
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if (!lwa_flag || vaddr != lwa_addr) {
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regs->sr &= ~SPR_SR_F;
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return;
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}
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if ((unsigned long)vaddr & 0x3) {
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do_unaligned_access(regs, address);
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return;
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}
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if (put_user(regs->gpr[rb], vaddr)) {
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if (user_mode(regs)) {
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force_sig(SIGSEGV);
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return;
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}
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if ((entry = search_exception_tables(orig_pc))) {
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regs->pc = entry->fixup;
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return;
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}
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/* kernel access in kernel space, store it directly */
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*((unsigned long *)vaddr) = regs->gpr[rb];
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}
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lwa_flag = 0;
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regs->sr |= SPR_SR_F;
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}
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#define INSN_LWA 0x1b
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#define INSN_SWA 0x33
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asmlinkage void do_illegal_instruction(struct pt_regs *regs,
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unsigned long address)
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{
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unsigned int op;
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unsigned int insn = *((unsigned int *)address);
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op = insn >> 26;
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switch (op) {
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case INSN_LWA:
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simulate_lwa(regs, address, insn);
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return;
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case INSN_SWA:
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simulate_swa(regs, address, insn);
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return;
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default:
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break;
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}
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if (user_mode(regs)) {
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/* Send a SIGILL */
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force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
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} else { /* Kernel mode */
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printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
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address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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