diff options
Diffstat (limited to 'arch/blackfin/kernel/traps.c')
| -rw-r--r-- | arch/blackfin/kernel/traps.c | 895 |
1 files changed, 275 insertions, 620 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c index 56a67ab698c..de5c2c3ebd9 100644 --- a/arch/blackfin/kernel/traps.c +++ b/arch/blackfin/kernel/traps.c @@ -1,53 +1,30 @@ /* - * File: arch/blackfin/kernel/traps.c - * Based on: - * Author: Hamish Macdonald + * Main exception handling logic. * - * Created: - * Description: uses S/W interrupt 15 for the system calls + * Copyright 2004-2010 Analog Devices Inc. * - * Modified: - * Copyright 2004-2006 Analog Devices Inc. - * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * Licensed under the GPL-2 or later */ +#include <linux/bug.h> #include <linux/uaccess.h> -#include <linux/interrupt.h> #include <linux/module.h> -#include <linux/kallsyms.h> -#include <linux/fs.h> #include <asm/traps.h> -#include <asm/cacheflush.h> +#include <asm/cplb.h> #include <asm/blackfin.h> #include <asm/irq_handler.h> #include <linux/irq.h> #include <asm/trace.h> #include <asm/fixed_code.h> -#include <asm/dma.h> +#include <asm/pseudo_instructions.h> +#include <asm/pda.h> #ifdef CONFIG_KGDB -# include <linux/debugger.h> # include <linux/kgdb.h> # define CHK_DEBUGGER_TRAP() \ do { \ - CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \ + kgdb_handle_exception(trapnr, sig, info.si_code, fp); \ } while (0) # define CHK_DEBUGGER_TRAP_MAYBE() \ do { \ @@ -59,6 +36,22 @@ # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0) #endif + +#ifdef CONFIG_DEBUG_VERBOSE +#define verbose_printk(fmt, arg...) \ + printk(fmt, ##arg) +#else +#define verbose_printk(fmt, arg...) \ + ({ if (0) printk(fmt, ##arg); 0; }) +#endif + +#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE) +u32 last_seqstat; +#ifdef CONFIG_DEBUG_MMRS_MODULE +EXPORT_SYMBOL(last_seqstat); +#endif +#endif + /* Initiate the event table handler */ void __init trap_init(void) { @@ -67,152 +60,34 @@ void __init trap_init(void) CSYNC(); } -int kstack_depth_to_print = 48; - -static void decode_address(char *buf, unsigned long address) +static int kernel_mode_regs(struct pt_regs *regs) { - struct vm_list_struct *vml; - struct task_struct *p; - struct mm_struct *mm; - unsigned long flags, offset; - unsigned int in_exception = bfin_read_IPEND() & 0x10; - -#ifdef CONFIG_KALLSYMS - unsigned long symsize; - const char *symname; - char *modname; - char *delim = ":"; - char namebuf[128]; - - /* look up the address and see if we are in kernel space */ - symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf); - - if (symname) { - /* yeah! kernel space! */ - if (!modname) - modname = delim = ""; - sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }", - (void *)address, delim, modname, delim, symname, - (unsigned long)offset); - return; - - } -#endif - - /* Problem in fixed code section? */ - if (address >= FIXED_CODE_START && address < FIXED_CODE_END) { - sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address); - return; - } - - /* Problem somewhere before the kernel start address */ - if (address < CONFIG_BOOT_LOAD) { - sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address); - return; - } - - /* looks like we're off in user-land, so let's walk all the - * mappings of all our processes and see if we can't be a whee - * bit more specific - */ - write_lock_irqsave(&tasklist_lock, flags); - for_each_process(p) { - mm = (in_exception ? p->mm : get_task_mm(p)); - if (!mm) - continue; - - vml = mm->context.vmlist; - while (vml) { - struct vm_area_struct *vma = vml->vma; - - if (address >= vma->vm_start && address < vma->vm_end) { - char _tmpbuf[256]; - char *name = p->comm; - struct file *file = vma->vm_file; - - if (file) - name = d_path(&file->f_path, _tmpbuf, - sizeof(_tmpbuf)); - - /* FLAT does not have its text aligned to the start of - * the map while FDPIC ELF does ... - */ - if (current->mm && - (address > current->mm->start_code) && - (address < current->mm->end_code)) - offset = address - current->mm->start_code; - else - offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT); - - sprintf(buf, "<0x%p> [ %s + 0x%lx ]", - (void *)address, name, offset); - if (!in_exception) - mmput(mm); - goto done; - } - - vml = vml->next; - } - if (!in_exception) - mmput(mm); - } - - /* we were unable to find this address anywhere */ - sprintf(buf, "<0x%p> /* unknown address */", (void *)address); - -done: - write_unlock_irqrestore(&tasklist_lock, flags); + return regs->ipend & 0xffc0; } -asmlinkage void double_fault_c(struct pt_regs *fp) -{ - console_verbose(); - oops_in_progress = 1; - printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n"); - dump_bfin_process(fp); - dump_bfin_mem(fp); - show_regs(fp); - panic("Double Fault - unrecoverable event\n"); - -} - -asmlinkage void trap_c(struct pt_regs *fp) +asmlinkage notrace void trap_c(struct pt_regs *fp) { #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON int j; #endif +#ifdef CONFIG_BFIN_PSEUDODBG_INSNS + int opcode; +#endif + unsigned int cpu = raw_smp_processor_id(); + const char *strerror = NULL; int sig = 0; siginfo_t info; unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE; trace_buffer_save(j); +#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE) + last_seqstat = (u32)fp->seqstat; +#endif /* Important - be very careful dereferncing pointers - will lead to * double faults if the stack has become corrupt */ - /* If the fault was caused by a kernel thread, or interrupt handler - * we will kernel panic, so the system reboots. - * If KGDB is enabled, don't set this for kernel breakpoints - */ - - /* TODO: check to see if we are in some sort of deferred HWERR - * that we should be able to recover from, not kernel panic - */ - if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP) -#ifdef CONFIG_KGDB - && (trapnr != VEC_EXCPT02) -#endif - ){ - console_verbose(); - oops_in_progress = 1; - } else if (current) { - if (current->mm == NULL) { - console_verbose(); - oops_in_progress = 1; - } - } - /* trap_c() will be called for exceptions. During exceptions * processing, the pc value should be set with retx value. * With this change we can cleanup some code in signal.c- TODO @@ -224,7 +99,7 @@ asmlinkage void trap_c(struct pt_regs *fp) /* send the appropriate signal to the user program */ switch (trapnr) { - /* This table works in conjuction with the one in ./mach-common/entry.S + /* This table works in conjunction with the one in ./mach-common/entry.S * Some exceptions are handled there (in assembly, in exception space) * Some are handled here, (in C, in interrupt space) * Some, like CPLB, are handled in both, where the normal path is @@ -239,54 +114,62 @@ asmlinkage void trap_c(struct pt_regs *fp) sig = SIGTRAP; CHK_DEBUGGER_TRAP_MAYBE(); /* Check if this is a breakpoint in kernel space */ - if (fp->ipend & 0xffc0) - return; + if (kernel_mode_regs(fp)) + goto traps_done; else break; -#ifdef CONFIG_KGDB - case VEC_EXCPT02 : /* gdb connection */ - info.si_code = TRAP_ILLTRAP; - sig = SIGTRAP; - CHK_DEBUGGER_TRAP(); - return; -#else - /* 0x02 - User Defined, Caught by default */ -#endif /* 0x03 - User Defined, userspace stack overflow */ case VEC_EXCPT03: info.si_code = SEGV_STACKFLOW; sig = SIGSEGV; - printk(KERN_NOTICE EXC_0x03(KERN_NOTICE)); + strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); + break; + /* 0x02 - KGDB initial connection and break signal trap */ + case VEC_EXCPT02: +#ifdef CONFIG_KGDB + info.si_code = TRAP_ILLTRAP; + sig = SIGTRAP; CHK_DEBUGGER_TRAP(); + goto traps_done; +#endif + /* 0x04 - User Defined */ + /* 0x05 - User Defined */ + /* 0x06 - User Defined */ + /* 0x07 - User Defined */ + /* 0x08 - User Defined */ + /* 0x09 - User Defined */ + /* 0x0A - User Defined */ + /* 0x0B - User Defined */ + /* 0x0C - User Defined */ + /* 0x0D - User Defined */ + /* 0x0E - User Defined */ + /* 0x0F - User Defined */ + /* If we got here, it is most likely that someone was trying to use a + * custom exception handler, and it is not actually installed properly + */ + case VEC_EXCPT04 ... VEC_EXCPT15: + info.si_code = ILL_ILLPARAOP; + sig = SIGILL; + strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; - /* 0x04 - User Defined, Caught by default */ - /* 0x05 - User Defined, Caught by default */ - /* 0x06 - User Defined, Caught by default */ - /* 0x07 - User Defined, Caught by default */ - /* 0x08 - User Defined, Caught by default */ - /* 0x09 - User Defined, Caught by default */ - /* 0x0A - User Defined, Caught by default */ - /* 0x0B - User Defined, Caught by default */ - /* 0x0C - User Defined, Caught by default */ - /* 0x0D - User Defined, Caught by default */ - /* 0x0E - User Defined, Caught by default */ - /* 0x0F - User Defined, Caught by default */ /* 0x10 HW Single step, handled here */ case VEC_STEP: info.si_code = TRAP_STEP; sig = SIGTRAP; CHK_DEBUGGER_TRAP_MAYBE(); /* Check if this is a single step in kernel space */ - if (fp->ipend & 0xffc0) - return; + if (kernel_mode_regs(fp)) + goto traps_done; else break; /* 0x11 - Trace Buffer Full, handled here */ case VEC_OVFLOW: info.si_code = TRAP_TRACEFLOW; sig = SIGTRAP; - printk(KERN_NOTICE EXC_0x11(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x12 - Reserved, Caught by default */ /* 0x13 - Reserved, Caught by default */ @@ -305,58 +188,87 @@ asmlinkage void trap_c(struct pt_regs *fp) /* 0x20 - Reserved, Caught by default */ /* 0x21 - Undefined Instruction, handled here */ case VEC_UNDEF_I: +#ifdef CONFIG_BUG + if (kernel_mode_regs(fp)) { + switch (report_bug(fp->pc, fp)) { + case BUG_TRAP_TYPE_NONE: + break; + case BUG_TRAP_TYPE_WARN: + dump_bfin_trace_buffer(); + fp->pc += 2; + goto traps_done; + case BUG_TRAP_TYPE_BUG: + /* call to panic() will dump trace, and it is + * off at this point, so it won't be clobbered + */ + panic("BUG()"); + } + } +#endif +#ifdef CONFIG_BFIN_PSEUDODBG_INSNS + /* + * Support for the fake instructions, if the instruction fails, + * then just execute a illegal opcode failure (like normal). + * Don't support these instructions inside the kernel + */ + if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) { + if (execute_pseudodbg_assert(fp, opcode)) + goto traps_done; + if (execute_pseudodbg(fp, opcode)) + goto traps_done; + } +#endif info.si_code = ILL_ILLOPC; sig = SIGILL; - printk(KERN_NOTICE EXC_0x21(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x22 - Illegal Instruction Combination, handled here */ case VEC_ILGAL_I: info.si_code = ILL_ILLPARAOP; sig = SIGILL; - printk(KERN_NOTICE EXC_0x22(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x23 - Data CPLB protection violation, handled here */ case VEC_CPLB_VL: info.si_code = ILL_CPLB_VI; - sig = SIGBUS; - printk(KERN_NOTICE EXC_0x23(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + sig = SIGSEGV; + strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x24 - Data access misaligned, handled here */ case VEC_MISALI_D: info.si_code = BUS_ADRALN; sig = SIGBUS; - printk(KERN_NOTICE EXC_0x24(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x25 - Unrecoverable Event, handled here */ case VEC_UNCOV: info.si_code = ILL_ILLEXCPT; sig = SIGILL; - printk(KERN_NOTICE EXC_0x25(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr, error case is handled here */ case VEC_CPLB_M: info.si_code = BUS_ADRALN; sig = SIGBUS; - printk(KERN_NOTICE EXC_0x26(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE); break; /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */ case VEC_CPLB_MHIT: info.si_code = ILL_CPLB_MULHIT; -#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO sig = SIGSEGV; - printk(KERN_NOTICE "NULL pointer access (probably)\n"); -#else - sig = SIGILL; - printk(KERN_NOTICE EXC_0x27(KERN_NOTICE)); +#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO + if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START) + strerror = KERN_NOTICE "NULL pointer access\n"; + else #endif - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x28 - Emulation Watchpoint, handled here */ case VEC_WATCH: @@ -365,8 +277,8 @@ asmlinkage void trap_c(struct pt_regs *fp) pr_debug(EXC_0x28(KERN_DEBUG)); CHK_DEBUGGER_TRAP_MAYBE(); /* Check if this is a watchpoint in kernel space */ - if (fp->ipend & 0xffc0) - return; + if (kernel_mode_regs(fp)) + goto traps_done; else break; #ifdef CONFIG_BF535 @@ -374,8 +286,8 @@ asmlinkage void trap_c(struct pt_regs *fp) case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */ info.si_code = BUS_OPFETCH; sig = SIGBUS; - printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n"); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n"; + CHK_DEBUGGER_TRAP_MAYBE(); break; #else /* 0x29 - Reserved, Caught by default */ @@ -384,41 +296,40 @@ asmlinkage void trap_c(struct pt_regs *fp) case VEC_MISALI_I: info.si_code = BUS_ADRALN; sig = SIGBUS; - printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x2B - Instruction CPLB protection violation, handled here */ case VEC_CPLB_I_VL: info.si_code = ILL_CPLB_VI; sig = SIGBUS; - printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */ case VEC_CPLB_I_M: info.si_code = ILL_CPLB_MISS; sig = SIGBUS; - printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE); break; /* 0x2D - Instruction CPLB Multiple Hits, handled here */ case VEC_CPLB_I_MHIT: info.si_code = ILL_CPLB_MULHIT; -#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO sig = SIGSEGV; - printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n"); -#else - sig = SIGILL; - printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE)); +#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO + if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START) + strerror = KERN_NOTICE "Jump to NULL address\n"; + else #endif - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x2E - Illegal use of Supervisor Resource, handled here */ case VEC_ILL_RES: info.si_code = ILL_PRVOPC; sig = SIGILL; - printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE)); - CHK_DEBUGGER_TRAP(); + strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE); + CHK_DEBUGGER_TRAP_MAYBE(); break; /* 0x2F - Reserved, Caught by default */ /* 0x30 - Reserved, Caught by default */ @@ -445,17 +356,47 @@ asmlinkage void trap_c(struct pt_regs *fp) case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR): info.si_code = BUS_ADRALN; sig = SIGBUS; - printk(KERN_NOTICE HWC_x2(KERN_NOTICE)); + strerror = KERN_NOTICE HWC_x2(KERN_NOTICE); break; /* External Memory Addressing Error */ case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR): + if (ANOMALY_05000310) { + static unsigned long anomaly_rets; + + if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) && + (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) { + /* + * A false hardware error will happen while fetching at + * the L1 instruction SRAM boundary. Ignore it. + */ + anomaly_rets = fp->rets; + goto traps_done; + } else if (fp->rets == anomaly_rets) { + /* + * While boundary code returns to a function, at the ret + * point, a new false hardware error might occur too based + * on tests. Ignore it too. + */ + goto traps_done; + } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) && + (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) { + /* + * If boundary code calls a function, at the entry point, + * a new false hardware error maybe happen based on tests. + * Ignore it too. + */ + goto traps_done; + } else + anomaly_rets = 0; + } + info.si_code = BUS_ADRERR; sig = SIGBUS; - printk(KERN_NOTICE HWC_x3(KERN_NOTICE)); + strerror = KERN_NOTICE HWC_x3(KERN_NOTICE); break; /* Performance Monitor Overflow */ case (SEQSTAT_HWERRCAUSE_PERF_FLOW): - printk(KERN_NOTICE HWC_x12(KERN_NOTICE)); + strerror = KERN_NOTICE HWC_x12(KERN_NOTICE); break; /* RAISE 5 instruction */ case (SEQSTAT_HWERRCAUSE_RAISE_5): @@ -465,21 +406,35 @@ asmlinkage void trap_c(struct pt_regs *fp) printk(KERN_NOTICE HWC_default(KERN_NOTICE)); break; } - CHK_DEBUGGER_TRAP(); + CHK_DEBUGGER_TRAP_MAYBE(); break; + /* + * We should be handling all known exception types above, + * if we get here we hit a reserved one, so panic + */ default: - info.si_code = TRAP_ILLTRAP; - sig = SIGTRAP; - printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n", + info.si_code = ILL_ILLPARAOP; + sig = SIGILL; + verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n", (fp->seqstat & SEQSTAT_EXCAUSE)); - CHK_DEBUGGER_TRAP(); + CHK_DEBUGGER_TRAP_MAYBE(); 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)) { + console_verbose(); + oops_in_progress = 1; + } + if (sig != SIGTRAP) { - unsigned long stack; + if (strerror) + verbose_printk(strerror); + dump_bfin_process(fp); dump_bfin_mem(fp); show_regs(fp); @@ -487,418 +442,100 @@ asmlinkage void trap_c(struct pt_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) - printk(KERN_NOTICE "No trace since you do not have " - "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n" - KERN_NOTICE "\n"); + verbose_printk(KERN_NOTICE "No trace since you do not have " + "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n"); else #endif dump_bfin_trace_buffer(); - show_stack(current, &stack); + 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 - printk(KERN_EMERG "Please turn on " + verbose_printk(KERN_EMERG "Please turn on " "CONFIG_ACCESS_CHECK\n"); #endif panic("Kernel exception"); - } - } - - info.si_signo = sig; - info.si_errno = 0; - info.si_addr = (void *)fp->pc; - force_sig_info(sig, &info, current); - - trace_buffer_restore(j); - return; -} - -/* Typical exception handling routines */ - -#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1) - -void dump_bfin_trace_buffer(void) -{ -#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON - int tflags, i = 0; - char buf[150]; -#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND - int j, index; + } 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 - - trace_buffer_save(tflags); - - printk(KERN_NOTICE "Hardware Trace:\n"); - - if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) { - for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) { - decode_address(buf, (unsigned long)bfin_read_TBUF()); - printk(KERN_NOTICE "%4i Target : %s\n", i, buf); - decode_address(buf, (unsigned long)bfin_read_TBUF()); - printk(KERN_NOTICE " Source : %s\n", buf); } } -#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND - if (trace_buff_offset) - index = trace_buff_offset/4 - 1; - else - index = EXPAND_LEN; - - j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128; - while (j) { - decode_address(buf, software_trace_buff[index]); - printk(KERN_NOTICE "%4i Target : %s\n", i, buf); - index -= 1; - if (index < 0 ) - index = EXPAND_LEN; - decode_address(buf, software_trace_buff[index]); - printk(KERN_NOTICE " Source : %s\n", buf); - index -= 1; - if (index < 0) - index = EXPAND_LEN; - j--; - i++; - } +#ifdef CONFIG_IPIPE + if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp)) #endif - - trace_buffer_restore(tflags); -#endif -} -EXPORT_SYMBOL(dump_bfin_trace_buffer); - -static void show_trace(struct task_struct *tsk, unsigned long *sp) -{ - unsigned long addr; - - printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n"); - - while (!kstack_end(sp)) { - addr = *sp++; - /* - * If the address is either in the text segment of the - * kernel, or in the region which contains vmalloc'ed - * memory, it *may* be the address of a calling - * routine; if so, print it so that someone tracing - * down the cause of the crash will be able to figure - * out the call path that was taken. - */ - if (kernel_text_address(addr)) - print_ip_sym(addr); - } - - printk(KERN_NOTICE "\n"); -} - -void show_stack(struct task_struct *task, unsigned long *stack) -{ - unsigned long *endstack, addr; - int i; - - /* Cannot call dump_bfin_trace_buffer() here as show_stack() is - * called externally in some places in the kernel. - */ - - if (!stack) { - if (task) - stack = (unsigned long *)task->thread.ksp; - else - stack = (unsigned long *)&stack; - } - - addr = (unsigned long)stack; - endstack = (unsigned long *)PAGE_ALIGN(addr); - - printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack); - for (i = 0; i < kstack_depth_to_print; i++) { - if (stack + 1 > endstack) + { + 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; - if (i % 8 == 0) - printk("\n" KERN_NOTICE " "); - printk(" %08lx", *stack++); + default: + info.si_addr = (void __user *)fp->pc; + break; + } + force_sig_info(sig, &info, current); } - printk("\n"); - show_trace(task, stack); + 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); } -void dump_stack(void) +asmlinkage void double_fault_c(struct pt_regs *fp) { - unsigned long stack; #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON - int tflags; + int j; + trace_buffer_save(j); #endif - trace_buffer_save(tflags); - dump_bfin_trace_buffer(); - show_stack(current, &stack); - trace_buffer_restore(tflags); -} -EXPORT_SYMBOL(dump_stack); -void dump_bfin_process(struct pt_regs *fp) -{ - /* We should be able to look at fp->ipend, but we don't push it on the - * stack all the time, so do this until we fix that */ - unsigned int context = bfin_read_IPEND(); - - if (oops_in_progress) - printk(KERN_EMERG "Kernel OOPS in progress\n"); - - if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) - printk(KERN_NOTICE "HW Error context\n"); - else if (context & 0x0020) - printk(KERN_NOTICE "Deferred Exception context\n"); - else if (context & 0x3FC0) - printk(KERN_NOTICE "Interrupt context\n"); - else if (context & 0x4000) - printk(KERN_NOTICE "Deferred Interrupt context\n"); - else if (context & 0x8000) - printk(KERN_NOTICE "Kernel process context\n"); - - if (current->pid && current->mm) { - printk(KERN_NOTICE "CURRENT PROCESS:\n"); - printk(KERN_NOTICE "COMM=%s PID=%d\n", - current->comm, current->pid); - - printk(KERN_NOTICE "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n" - KERN_NOTICE "BSS = 0x%p-0x%p USER-STACK = 0x%p\n" - KERN_NOTICE "\n", - (void *)current->mm->start_code, - (void *)current->mm->end_code, - (void *)current->mm->start_data, - (void *)current->mm->end_data, - (void *)current->mm->end_data, - (void *)current->mm->brk, - (void *)current->mm->start_stack); + 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 - printk(KERN_NOTICE "\n" KERN_NOTICE - "No Valid process in current context\n"); -} - -void dump_bfin_mem(struct pt_regs *fp) -{ - unsigned short *addr, *erraddr, val = 0, err = 0; - char sti = 0, buf[6]; - - if (unlikely((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)) - erraddr = (void *)fp->pc; - else - erraddr = (void *)fp->retx; - - printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr); - - for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10; - addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10; - addr++) { - if (!((unsigned long)addr & 0xF)) - printk("\n" KERN_NOTICE "0x%p: ", addr); - - if (get_user(val, addr)) { - if (addr >= (unsigned short *)L1_CODE_START && - addr < (unsigned short *)(L1_CODE_START + L1_CODE_LENGTH)) { - dma_memcpy(&val, addr, sizeof(val)); - sprintf(buf, "%04x", val); - } else if (addr >= (unsigned short *)FIXED_CODE_START && - addr <= (unsigned short *)memory_start) { - val = bfin_read16(addr); - sprintf(buf, "%04x", val); - } else { - val = 0; - sprintf(buf, "????"); - } - } else - sprintf(buf, "%04x", val); - - if (addr == erraddr) { - printk("[%s]", buf); - err = val; - } else - printk(" %s ", buf); - - /* Do any previous instructions turn on interrupts? */ - if (addr <= erraddr && /* in the past */ - ((val >= 0x0040 && val <= 0x0047) || /* STI instruction */ - val == 0x017b)) /* [SP++] = RETI */ - sti = 1; - } - - printk("\n"); - - /* Hardware error interrupts can be deferred */ - if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR && - oops_in_progress)){ - printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n"); -#ifndef CONFIG_DEBUG_HWERR - printk(KERN_NOTICE "The remaining message may be meaningless\n" - KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a" - " better idea where it came from\n"); -#else - /* If we are handling only one peripheral interrupt - * and current mm and pid are valid, and the last error - * was in that user space process's text area - * print it out - because that is where the problem exists - */ - if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) && - (current->pid && current->mm)) { - /* And the last RETI points to the current userspace context */ - if ((fp + 1)->pc >= current->mm->start_code && - (fp + 1)->pc <= current->mm->end_code) { - printk(KERN_NOTICE "It might be better to look around here : \n"); - printk(KERN_NOTICE "-------------------------------------------\n"); - show_regs(fp + 1); - printk(KERN_NOTICE "-------------------------------------------\n"); - } - } #endif + { + dump_bfin_process(fp); + dump_bfin_mem(fp); + show_regs(fp); + dump_bfin_trace_buffer(); } -} - -void show_regs(struct pt_regs *fp) -{ - char buf [150]; - struct irqaction *action; - unsigned int i; - unsigned long flags; - - printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted()); - printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n", - (long)fp->seqstat, fp->ipend, fp->syscfg); - printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n", - (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14); - printk(KERN_NOTICE " EXCAUSE : 0x%lx\n", - fp->seqstat & SEQSTAT_EXCAUSE); - for (i = 6; i <= 15 ; i++) { - if (fp->ipend & (1 << i)) { - decode_address(buf, bfin_read32(EVT0 + 4*i)); - printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf); - } - } - - /* if no interrupts are going off, don't print this out */ - if (fp->ipend & ~0x3F) { - for (i = 0; i < (NR_IRQS - 1); i++) { - spin_lock_irqsave(&irq_desc[i].lock, flags); - action = irq_desc[i].action; - if (!action) - goto unlock; - - decode_address(buf, (unsigned int)action->handler); - printk(KERN_NOTICE " logical irq %3d mapped : %s", i, buf); - for (action = action->next; action; action = action->next) { - decode_address(buf, (unsigned int)action->handler); - printk(", %s", buf); - } - printk("\n"); -unlock: - spin_unlock_irqrestore(&irq_desc[i].lock, flags); - } - } - - decode_address(buf, fp->rete); - printk(KERN_NOTICE " RETE: %s\n", buf); - decode_address(buf, fp->retn); - printk(KERN_NOTICE " RETN: %s\n", buf); - decode_address(buf, fp->retx); - printk(KERN_NOTICE " RETX: %s\n", buf); - decode_address(buf, fp->rets); - printk(KERN_NOTICE " RETS: %s\n", buf); - decode_address(buf, fp->pc); - printk(KERN_NOTICE " PC : %s\n", buf); - - if (((long)fp->seqstat & SEQSTAT_EXCAUSE) && - (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) { - decode_address(buf, bfin_read_DCPLB_FAULT_ADDR()); - printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf); - decode_address(buf, bfin_read_ICPLB_FAULT_ADDR()); - printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf); - } - - printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n"); - printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", - fp->r0, fp->r1, fp->r2, fp->r3); - printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", - fp->r4, fp->r5, fp->r6, fp->r7); - printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n", - fp->p0, fp->p1, fp->p2, fp->p3); - printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n", - fp->p4, fp->p5, fp->fp, (long)fp); - printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n", - fp->lb0, fp->lt0, fp->lc0); - printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n", - fp->lb1, fp->lt1, fp->lc1); - printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n", - fp->b0, fp->l0, fp->m0, fp->i0); - printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n", - fp->b1, fp->l1, fp->m1, fp->i1); - printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n", - fp->b2, fp->l2, fp->m2, fp->i2); - printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n", - fp->b3, fp->l3, fp->m3, fp->i3); - printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n", - fp->a0w, fp->a0x, fp->a1w, fp->a1x); - - printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n", - rdusp(), fp->astat); - - printk(KERN_NOTICE "\n"); -} - -#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1 -asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text)); #endif + panic("Double Fault - unrecoverable event"); -asmlinkage int sys_bfin_spinlock(int *spinlock) -{ - int ret = 0; - int tmp = 0; - - local_irq_disable(); - ret = get_user(tmp, spinlock); - if (ret == 0) { - if (tmp) - ret = 1; - tmp = 1; - put_user(tmp, spinlock); - } - local_irq_enable(); - return ret; } -int bfin_request_exception(unsigned int exception, void (*handler)(void)) -{ - void (*curr_handler)(void); - - if (exception > 0x3F) - return -EINVAL; - - curr_handler = ex_table[exception]; - - if (curr_handler != ex_replaceable) - return -EBUSY; - - ex_table[exception] = handler; - - return 0; -} -EXPORT_SYMBOL(bfin_request_exception); - -int bfin_free_exception(unsigned int exception, void (*handler)(void)) -{ - void (*curr_handler)(void); - - if (exception > 0x3F) - return -EINVAL; - - curr_handler = ex_table[exception]; - - if (curr_handler != handler) - return -EBUSY; - - ex_table[exception] = ex_replaceable; - - return 0; -} -EXPORT_SYMBOL(bfin_free_exception); void panic_cplb_error(int cplb_panic, struct pt_regs *fp) { @@ -917,11 +554,29 @@ void panic_cplb_error(int cplb_panic, struct pt_regs *fp) oops_in_progress = 1; - printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR()); - printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR()); dump_bfin_process(fp); dump_bfin_mem(fp); show_regs(fp); dump_stack(); - panic("Unrecoverable event\n"); + 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 |