6ce3e9c2a2
A few pseudo debug insns exist to make testing of simulators easier. Since these don't actually exist in the hardware, we have to have the exception handler take care of emulating these. This allows sim test cases to be executed unmodified under Linux and thus simplify debugging greatly. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
579 lines
16 KiB
C
579 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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}
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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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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;
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sig = SIGILL;
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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;
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}
|
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|
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BUG_ON(sig == 0);
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|
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/* If the fault was caused by a kernel thread, or interrupt handler
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* we will kernel panic, so the system reboots.
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*/
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if (kernel_mode_regs(fp) || (current && !current->mm)) {
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console_verbose();
|
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oops_in_progress = 1;
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}
|
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|
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if (sig != SIGTRAP) {
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if (strerror)
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verbose_printk(strerror);
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|
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dump_bfin_process(fp);
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dump_bfin_mem(fp);
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show_regs(fp);
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|
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/* Print out the trace buffer if it makes sense */
|
|
#ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
|
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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 "
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"CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
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else
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#endif
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dump_bfin_trace_buffer();
|
|
|
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if (oops_in_progress) {
|
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/* Dump the current kernel stack */
|
|
verbose_printk(KERN_NOTICE "Kernel Stack\n");
|
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show_stack(current, NULL);
|
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print_modules();
|
|
#ifndef CONFIG_ACCESS_CHECK
|
|
verbose_printk(KERN_EMERG "Please turn on "
|
|
"CONFIG_ACCESS_CHECK\n");
|
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#endif
|
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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
|