582 lines
16 KiB
C
582 lines
16 KiB
C
/*
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* Main exception handling logic.
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*
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* Copyright 2004-2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later
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*/
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#include <linux/bug.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <asm/traps.h>
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#include <asm/cplb.h>
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#include <asm/blackfin.h>
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#include <asm/irq_handler.h>
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#include <linux/irq.h>
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#include <asm/trace.h>
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#include <asm/fixed_code.h>
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#include <asm/pseudo_instructions.h>
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#ifdef CONFIG_KGDB
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# include <linux/kgdb.h>
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# define CHK_DEBUGGER_TRAP() \
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do { \
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kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
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} while (0)
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# define CHK_DEBUGGER_TRAP_MAYBE() \
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do { \
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if (kgdb_connected) \
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CHK_DEBUGGER_TRAP(); \
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} while (0)
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#else
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# define CHK_DEBUGGER_TRAP() do { } while (0)
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# define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
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#endif
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#ifdef CONFIG_DEBUG_VERBOSE
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#define verbose_printk(fmt, arg...) \
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printk(fmt, ##arg)
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#else
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#define verbose_printk(fmt, arg...) \
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({ if (0) printk(fmt, ##arg); 0; })
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#endif
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#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
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u32 last_seqstat;
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#ifdef CONFIG_DEBUG_MMRS_MODULE
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EXPORT_SYMBOL(last_seqstat);
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#endif
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#endif
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/* Initiate the event table handler */
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void __init trap_init(void)
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{
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CSYNC();
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bfin_write_EVT3(trap);
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CSYNC();
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}
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static int kernel_mode_regs(struct pt_regs *regs)
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{
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return regs->ipend & 0xffc0;
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}
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asmlinkage notrace void trap_c(struct pt_regs *fp)
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{
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#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
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int j;
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#endif
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#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
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int opcode;
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#endif
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unsigned int cpu = raw_smp_processor_id();
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const char *strerror = NULL;
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int sig = 0;
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siginfo_t info;
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unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
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trace_buffer_save(j);
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#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
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last_seqstat = (u32)fp->seqstat;
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#endif
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/* Important - be very careful dereferncing pointers - will lead to
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* double faults if the stack has become corrupt
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*/
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/* trap_c() will be called for exceptions. During exceptions
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* processing, the pc value should be set with retx value.
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* With this change we can cleanup some code in signal.c- TODO
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*/
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fp->orig_pc = fp->retx;
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/* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
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trapnr, fp->ipend, fp->pc, fp->retx); */
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/* send the appropriate signal to the user program */
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switch (trapnr) {
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/* This table works in conjuction with the one in ./mach-common/entry.S
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* Some exceptions are handled there (in assembly, in exception space)
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* Some are handled here, (in C, in interrupt space)
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* Some, like CPLB, are handled in both, where the normal path is
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* handled in assembly/exception space, and the error path is handled
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* here
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*/
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/* 0x00 - Linux Syscall, getting here is an error */
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/* 0x01 - userspace gdb breakpoint, handled here */
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case VEC_EXCPT01:
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info.si_code = TRAP_ILLTRAP;
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sig = SIGTRAP;
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CHK_DEBUGGER_TRAP_MAYBE();
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/* Check if this is a breakpoint in kernel space */
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if (kernel_mode_regs(fp))
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goto traps_done;
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else
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break;
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/* 0x03 - User Defined, userspace stack overflow */
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case VEC_EXCPT03:
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info.si_code = SEGV_STACKFLOW;
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sig = SIGSEGV;
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strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x02 - KGDB initial connection and break signal trap */
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case VEC_EXCPT02:
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#ifdef CONFIG_KGDB
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info.si_code = TRAP_ILLTRAP;
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sig = SIGTRAP;
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CHK_DEBUGGER_TRAP();
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goto traps_done;
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#endif
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/* 0x04 - User Defined */
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/* 0x05 - User Defined */
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/* 0x06 - User Defined */
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/* 0x07 - User Defined */
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/* 0x08 - User Defined */
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/* 0x09 - User Defined */
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/* 0x0A - User Defined */
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/* 0x0B - User Defined */
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/* 0x0C - User Defined */
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/* 0x0D - User Defined */
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/* 0x0E - User Defined */
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/* 0x0F - User Defined */
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/* If we got here, it is most likely that someone was trying to use a
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* custom exception handler, and it is not actually installed properly
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*/
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case VEC_EXCPT04 ... VEC_EXCPT15:
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info.si_code = ILL_ILLPARAOP;
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sig = SIGILL;
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strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x10 HW Single step, handled here */
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case VEC_STEP:
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info.si_code = TRAP_STEP;
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sig = SIGTRAP;
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CHK_DEBUGGER_TRAP_MAYBE();
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/* Check if this is a single step in kernel space */
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if (kernel_mode_regs(fp))
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goto traps_done;
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else
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break;
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/* 0x11 - Trace Buffer Full, handled here */
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case VEC_OVFLOW:
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info.si_code = TRAP_TRACEFLOW;
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sig = SIGTRAP;
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strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x12 - Reserved, Caught by default */
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/* 0x13 - Reserved, Caught by default */
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/* 0x14 - Reserved, Caught by default */
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/* 0x15 - Reserved, Caught by default */
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/* 0x16 - Reserved, Caught by default */
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/* 0x17 - Reserved, Caught by default */
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/* 0x18 - Reserved, Caught by default */
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/* 0x19 - Reserved, Caught by default */
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/* 0x1A - Reserved, Caught by default */
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/* 0x1B - Reserved, Caught by default */
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/* 0x1C - Reserved, Caught by default */
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/* 0x1D - Reserved, Caught by default */
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/* 0x1E - Reserved, Caught by default */
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/* 0x1F - Reserved, Caught by default */
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/* 0x20 - Reserved, Caught by default */
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/* 0x21 - Undefined Instruction, handled here */
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case VEC_UNDEF_I:
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#ifdef CONFIG_BUG
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if (kernel_mode_regs(fp)) {
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switch (report_bug(fp->pc, fp)) {
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case BUG_TRAP_TYPE_NONE:
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break;
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case BUG_TRAP_TYPE_WARN:
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dump_bfin_trace_buffer();
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fp->pc += 2;
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goto traps_done;
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case BUG_TRAP_TYPE_BUG:
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/* call to panic() will dump trace, and it is
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* off at this point, so it won't be clobbered
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*/
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panic("BUG()");
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}
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}
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#endif
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#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
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/*
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* Support for the fake instructions, if the instruction fails,
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* then just execute a illegal opcode failure (like normal).
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* Don't support these instructions inside the kernel
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*/
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if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) {
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if (execute_pseudodbg_assert(fp, opcode))
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goto traps_done;
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if (execute_pseudodbg(fp, opcode))
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goto traps_done;
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}
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#endif
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info.si_code = ILL_ILLOPC;
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sig = SIGILL;
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strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x22 - Illegal Instruction Combination, handled here */
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case VEC_ILGAL_I:
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info.si_code = ILL_ILLPARAOP;
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sig = SIGILL;
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strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x23 - Data CPLB protection violation, handled here */
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case VEC_CPLB_VL:
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info.si_code = ILL_CPLB_VI;
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sig = SIGSEGV;
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strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x24 - Data access misaligned, handled here */
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case VEC_MISALI_D:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x25 - Unrecoverable Event, handled here */
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case VEC_UNCOV:
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info.si_code = ILL_ILLEXCPT;
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sig = SIGILL;
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strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
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error case is handled here */
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case VEC_CPLB_M:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
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break;
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/* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
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case VEC_CPLB_MHIT:
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info.si_code = ILL_CPLB_MULHIT;
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sig = SIGSEGV;
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#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
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if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
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strerror = KERN_NOTICE "NULL pointer access\n";
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else
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#endif
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strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x28 - Emulation Watchpoint, handled here */
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case VEC_WATCH:
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info.si_code = TRAP_WATCHPT;
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sig = SIGTRAP;
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pr_debug(EXC_0x28(KERN_DEBUG));
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CHK_DEBUGGER_TRAP_MAYBE();
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/* Check if this is a watchpoint in kernel space */
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if (kernel_mode_regs(fp))
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goto traps_done;
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else
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break;
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#ifdef CONFIG_BF535
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/* 0x29 - Instruction fetch access error (535 only) */
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case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
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info.si_code = BUS_OPFETCH;
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sig = SIGBUS;
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strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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#else
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/* 0x29 - Reserved, Caught by default */
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#endif
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/* 0x2A - Instruction fetch misaligned, handled here */
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case VEC_MISALI_I:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x2B - Instruction CPLB protection violation, handled here */
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case VEC_CPLB_I_VL:
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info.si_code = ILL_CPLB_VI;
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sig = SIGBUS;
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strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
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case VEC_CPLB_I_M:
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info.si_code = ILL_CPLB_MISS;
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sig = SIGBUS;
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strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
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break;
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/* 0x2D - Instruction CPLB Multiple Hits, handled here */
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case VEC_CPLB_I_MHIT:
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info.si_code = ILL_CPLB_MULHIT;
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sig = SIGSEGV;
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#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
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if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
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strerror = KERN_NOTICE "Jump to NULL address\n";
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else
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#endif
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strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x2E - Illegal use of Supervisor Resource, handled here */
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case VEC_ILL_RES:
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info.si_code = ILL_PRVOPC;
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sig = SIGILL;
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strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
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CHK_DEBUGGER_TRAP_MAYBE();
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break;
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/* 0x2F - Reserved, Caught by default */
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/* 0x30 - Reserved, Caught by default */
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/* 0x31 - Reserved, Caught by default */
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/* 0x32 - Reserved, Caught by default */
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/* 0x33 - Reserved, Caught by default */
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/* 0x34 - Reserved, Caught by default */
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/* 0x35 - Reserved, Caught by default */
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/* 0x36 - Reserved, Caught by default */
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/* 0x37 - Reserved, Caught by default */
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/* 0x38 - Reserved, Caught by default */
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/* 0x39 - Reserved, Caught by default */
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/* 0x3A - Reserved, Caught by default */
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/* 0x3B - Reserved, Caught by default */
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/* 0x3C - Reserved, Caught by default */
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/* 0x3D - Reserved, Caught by default */
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/* 0x3E - Reserved, Caught by default */
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/* 0x3F - Reserved, Caught by default */
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case VEC_HWERR:
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
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/* System MMR Error */
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case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
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info.si_code = BUS_ADRALN;
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sig = SIGBUS;
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strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
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break;
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/* External Memory Addressing Error */
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case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
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if (ANOMALY_05000310) {
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static unsigned long anomaly_rets;
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if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
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(fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
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/*
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* A false hardware error will happen while fetching at
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* the L1 instruction SRAM boundary. Ignore it.
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*/
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anomaly_rets = fp->rets;
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goto traps_done;
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} else if (fp->rets == anomaly_rets) {
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/*
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* While boundary code returns to a function, at the ret
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* point, a new false hardware error might occur too based
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* on tests. Ignore it too.
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*/
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goto traps_done;
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} else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
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(fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
|
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/*
|
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* If boundary code calls a function, at the entry point,
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* a new false hardware error maybe happen based on tests.
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* Ignore it too.
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*/
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goto traps_done;
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} else
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anomaly_rets = 0;
|
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}
|
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|
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info.si_code = BUS_ADRERR;
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sig = SIGBUS;
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strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
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break;
|
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/* Performance Monitor Overflow */
|
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case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
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strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
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break;
|
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/* RAISE 5 instruction */
|
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case (SEQSTAT_HWERRCAUSE_RAISE_5):
|
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printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
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break;
|
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default: /* Reserved */
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printk(KERN_NOTICE HWC_default(KERN_NOTICE));
|
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break;
|
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}
|
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CHK_DEBUGGER_TRAP_MAYBE();
|
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break;
|
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/*
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* We should be handling all known exception types above,
|
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* if we get here we hit a reserved one, so panic
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*/
|
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default:
|
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info.si_code = ILL_ILLPARAOP;
|
|
sig = SIGILL;
|
|
verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
|
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(fp->seqstat & SEQSTAT_EXCAUSE));
|
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CHK_DEBUGGER_TRAP_MAYBE();
|
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break;
|
|
}
|
|
|
|
BUG_ON(sig == 0);
|
|
|
|
/* If the fault was caused by a kernel thread, or interrupt handler
|
|
* we will kernel panic, so the system reboots.
|
|
*/
|
|
if (kernel_mode_regs(fp) || (current && !current->mm)) {
|
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console_verbose();
|
|
oops_in_progress = 1;
|
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}
|
|
|
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if (sig != SIGTRAP) {
|
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if (strerror)
|
|
verbose_printk(strerror);
|
|
|
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dump_bfin_process(fp);
|
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dump_bfin_mem(fp);
|
|
show_regs(fp);
|
|
|
|
/* Print out the trace buffer if it makes sense */
|
|
#ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
|
|
if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
|
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verbose_printk(KERN_NOTICE "No trace since you do not have "
|
|
"CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
|
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else
|
|
#endif
|
|
dump_bfin_trace_buffer();
|
|
|
|
if (oops_in_progress) {
|
|
/* Dump the current kernel stack */
|
|
verbose_printk(KERN_NOTICE "Kernel Stack\n");
|
|
show_stack(current, NULL);
|
|
print_modules();
|
|
#ifndef CONFIG_ACCESS_CHECK
|
|
verbose_printk(KERN_EMERG "Please turn on "
|
|
"CONFIG_ACCESS_CHECK\n");
|
|
#endif
|
|
panic("Kernel exception");
|
|
} else {
|
|
#ifdef CONFIG_DEBUG_VERBOSE
|
|
unsigned long *stack;
|
|
/* Dump the user space stack */
|
|
stack = (unsigned long *)rdusp();
|
|
verbose_printk(KERN_NOTICE "Userspace Stack\n");
|
|
show_stack(NULL, stack);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_IPIPE
|
|
if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
|
|
#endif
|
|
{
|
|
info.si_signo = sig;
|
|
info.si_errno = 0;
|
|
switch (trapnr) {
|
|
case VEC_CPLB_VL:
|
|
case VEC_MISALI_D:
|
|
case VEC_CPLB_M:
|
|
case VEC_CPLB_MHIT:
|
|
info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
|
|
break;
|
|
default:
|
|
info.si_addr = (void __user *)fp->pc;
|
|
break;
|
|
}
|
|
force_sig_info(sig, &info, current);
|
|
}
|
|
|
|
if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
|
|
(ANOMALY_05000281 && trapnr == VEC_HWERR) ||
|
|
(ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
|
|
fp->pc = SAFE_USER_INSTRUCTION;
|
|
|
|
traps_done:
|
|
trace_buffer_restore(j);
|
|
}
|
|
|
|
asmlinkage void double_fault_c(struct pt_regs *fp)
|
|
{
|
|
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
|
|
int j;
|
|
trace_buffer_save(j);
|
|
#endif
|
|
|
|
console_verbose();
|
|
oops_in_progress = 1;
|
|
#ifdef CONFIG_DEBUG_VERBOSE
|
|
printk(KERN_EMERG "Double Fault\n");
|
|
#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
|
|
if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
|
|
unsigned int cpu = raw_smp_processor_id();
|
|
char buf[150];
|
|
decode_address(buf, cpu_pda[cpu].retx_doublefault);
|
|
printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
|
|
(unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
|
|
decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
|
|
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
|
|
decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
|
|
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
|
|
|
|
decode_address(buf, fp->retx);
|
|
printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
|
|
} else
|
|
#endif
|
|
{
|
|
dump_bfin_process(fp);
|
|
dump_bfin_mem(fp);
|
|
show_regs(fp);
|
|
dump_bfin_trace_buffer();
|
|
}
|
|
#endif
|
|
panic("Double Fault - unrecoverable event");
|
|
|
|
}
|
|
|
|
|
|
void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
|
|
{
|
|
switch (cplb_panic) {
|
|
case CPLB_NO_UNLOCKED:
|
|
printk(KERN_EMERG "All CPLBs are locked\n");
|
|
break;
|
|
case CPLB_PROT_VIOL:
|
|
return;
|
|
case CPLB_NO_ADDR_MATCH:
|
|
return;
|
|
case CPLB_UNKNOWN_ERR:
|
|
printk(KERN_EMERG "Unknown CPLB Exception\n");
|
|
break;
|
|
}
|
|
|
|
oops_in_progress = 1;
|
|
|
|
dump_bfin_process(fp);
|
|
dump_bfin_mem(fp);
|
|
show_regs(fp);
|
|
dump_stack();
|
|
panic("Unrecoverable event");
|
|
}
|
|
|
|
#ifdef CONFIG_BUG
|
|
int is_valid_bugaddr(unsigned long addr)
|
|
{
|
|
unsigned int opcode;
|
|
|
|
if (!get_instruction(&opcode, (unsigned short *)addr))
|
|
return 0;
|
|
|
|
return opcode == BFIN_BUG_OPCODE;
|
|
}
|
|
#endif
|
|
|
|
/* stub this out */
|
|
#ifndef CONFIG_DEBUG_VERBOSE
|
|
void show_regs(struct pt_regs *fp)
|
|
{
|
|
|
|
}
|
|
#endif
|