diff options
Diffstat (limited to 'arch/blackfin/kernel/trace.c')
| -rw-r--r-- | arch/blackfin/kernel/trace.c | 594 |
1 files changed, 594 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/trace.c b/arch/blackfin/kernel/trace.c new file mode 100644 index 000000000000..3a268c3ed47e --- /dev/null +++ b/arch/blackfin/kernel/trace.c @@ -0,0 +1,594 @@ +/* provide some functions which dump the trace buffer, in a nice way for people + * to read it, and understand what is going on + * + * Copyright 2004-2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later + */ + +#include <linux/kernel.h> +#include <linux/hardirq.h> +#include <linux/thread_info.h> +#include <linux/mm.h> +#include <linux/uaccess.h> +#include <linux/module.h> +#include <linux/kallsyms.h> +#include <linux/err.h> +#include <linux/fs.h> +#include <asm/dma.h> +#include <asm/trace.h> +#include <asm/fixed_code.h> +#include <asm/traps.h> + +#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 + + +void decode_address(char *buf, unsigned long address) +{ +#ifdef CONFIG_DEBUG_VERBOSE + struct task_struct *p; + struct mm_struct *mm; + unsigned long flags, offset; + unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic(); + struct rb_node *n; + +#ifdef CONFIG_KALLSYMS + unsigned long symsize; + const char *symname; + char *modname; + char *delim = ":"; + char namebuf[128]; +#endif + + buf += sprintf(buf, "<0x%08lx> ", address); + +#ifdef CONFIG_KALLSYMS + /* 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, "{ %s%s%s%s + 0x%lx }", + delim, modname, delim, symname, + (unsigned long)offset); + return; + } +#endif + + if (address >= FIXED_CODE_START && address < FIXED_CODE_END) { + /* Problem in fixed code section? */ + strcat(buf, "/* Maybe fixed code section */"); + return; + + } else if (address < CONFIG_BOOT_LOAD) { + /* Problem somewhere before the kernel start address */ + strcat(buf, "/* Maybe null pointer? */"); + return; + + } else if (address >= COREMMR_BASE) { + strcat(buf, "/* core mmrs */"); + return; + + } else if (address >= SYSMMR_BASE) { + strcat(buf, "/* system mmrs */"); + return; + + } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) { + strcat(buf, "/* on-chip L1 ROM */"); + return; + } + + /* + * Don't walk any of the vmas if we are oopsing, it has been known + * to cause problems - corrupt vmas (kernel crashes) cause double faults + */ + if (oops_in_progress) { + strcat(buf, "/* kernel dynamic memory (maybe user-space) */"); + 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_atomic ? p->mm : get_task_mm(p)); + if (!mm) + continue; + + if (!down_read_trylock(&mm->mmap_sem)) { + if (!in_atomic) + mmput(mm); + continue; + } + + for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) { + struct vm_area_struct *vma; + + vma = rb_entry(n, struct vm_area_struct, vm_rb); + + if (address >= vma->vm_start && address < vma->vm_end) { + char _tmpbuf[256]; + char *name = p->comm; + struct file *file = vma->vm_file; + + if (file) { + char *d_name = d_path(&file->f_path, _tmpbuf, + sizeof(_tmpbuf)); + if (!IS_ERR(d_name)) + name = d_name; + } + + /* FLAT does not have its text aligned to the start of + * the map while FDPIC ELF does ... + */ + + /* before we can check flat/fdpic, we need to + * make sure current is valid + */ + if ((unsigned long)current >= FIXED_CODE_START && + !((unsigned long)current & 0x3)) { + 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, "[ %s + 0x%lx ]", name, offset); + } else + sprintf(buf, "[ %s vma:0x%lx-0x%lx]", + name, vma->vm_start, vma->vm_end); + + up_read(&mm->mmap_sem); + if (!in_atomic) + mmput(mm); + + if (buf[0] == '\0') + sprintf(buf, "[ %s ] dynamic memory", name); + + goto done; + } + } + + up_read(&mm->mmap_sem); + if (!in_atomic) + mmput(mm); + } + + /* + * we were unable to find this address anywhere, + * or some MMs were skipped because they were in use. + */ + sprintf(buf, "/* kernel dynamic memory */"); + +done: + write_unlock_irqrestore(&tasklist_lock, flags); +#else + sprintf(buf, " "); +#endif +} + +#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1) + +/* + * Similar to get_user, do some address checking, then dereference + * Return true on success, false on bad address + */ +bool get_instruction(unsigned short *val, unsigned short *address) +{ + unsigned long addr = (unsigned long)address; + + /* Check for odd addresses */ + if (addr & 0x1) + return false; + + /* MMR region will never have instructions */ + if (addr >= SYSMMR_BASE) + return false; + + switch (bfin_mem_access_type(addr, 2)) { + case BFIN_MEM_ACCESS_CORE: + case BFIN_MEM_ACCESS_CORE_ONLY: + *val = *address; + return true; + case BFIN_MEM_ACCESS_DMA: + dma_memcpy(val, address, 2); + return true; + case BFIN_MEM_ACCESS_ITEST: + isram_memcpy(val, address, 2); + return true; + default: /* invalid access */ + return false; + } +} + +/* + * decode the instruction if we are printing out the trace, as it + * makes things easier to follow, without running it through objdump + * These are the normal instructions which cause change of flow, which + * would be at the source of the trace buffer + */ +#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON) +static void decode_instruction(unsigned short *address) +{ + unsigned short opcode; + + if (get_instruction(&opcode, address)) { + if (opcode == 0x0010) + verbose_printk("RTS"); + else if (opcode == 0x0011) + verbose_printk("RTI"); + else if (opcode == 0x0012) + verbose_printk("RTX"); + else if (opcode == 0x0013) + verbose_printk("RTN"); + else if (opcode == 0x0014) + verbose_printk("RTE"); + else if (opcode == 0x0025) + verbose_printk("EMUEXCPT"); + else if (opcode >= 0x0040 && opcode <= 0x0047) + verbose_printk("STI R%i", opcode & 7); + else if (opcode >= 0x0050 && opcode <= 0x0057) + verbose_printk("JUMP (P%i)", opcode & 7); + else if (opcode >= 0x0060 && opcode <= 0x0067) + verbose_printk("CALL (P%i)", opcode & 7); + else if (opcode >= 0x0070 && opcode <= 0x0077) + verbose_printk("CALL (PC+P%i)", opcode & 7); + else if (opcode >= 0x0080 && opcode <= 0x0087) + verbose_printk("JUMP (PC+P%i)", opcode & 7); + else if (opcode >= 0x0090 && opcode <= 0x009F) + verbose_printk("RAISE 0x%x", opcode & 0xF); + else if (opcode >= 0x00A0 && opcode <= 0x00AF) + verbose_printk("EXCPT 0x%x", opcode & 0xF); + else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF)) + verbose_printk("IF !CC JUMP"); + else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff)) + verbose_printk("IF CC JUMP"); + else if (opcode >= 0x2000 && opcode <= 0x2fff) + verbose_printk("JUMP.S"); + else if (opcode >= 0xe080 && opcode <= 0xe0ff) + verbose_printk("LSETUP"); + else if (opcode >= 0xe200 && opcode <= 0xe2ff) + verbose_printk("JUMP.L"); + else if (opcode >= 0xe300 && opcode <= 0xe3ff) + verbose_printk("CALL pcrel"); + else + verbose_printk("0x%04x", opcode); + } + +} +#endif + +void dump_bfin_trace_buffer(void) +{ +#ifdef CONFIG_DEBUG_VERBOSE +#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON + int tflags, i = 0; + char buf[150]; + unsigned short *addr; +#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND + int j, index; +#endif + + trace_buffer_save(tflags); + + printk(KERN_NOTICE "Hardware Trace:\n"); + +#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND + printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n"); +#endif + + 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); + addr = (unsigned short *)bfin_read_TBUF(); + decode_address(buf, (unsigned long)addr); + printk(KERN_NOTICE " Source : %s ", buf); + decode_instruction(addr); + printk("\n"); + } + } + +#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND + if (trace_buff_offset) + index = trace_buff_offset / 4; + 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 ", buf); + decode_instruction((unsigned short *)software_trace_buff[index]); + printk("\n"); + index -= 1; + if (index < 0) + index = EXPAND_LEN; + j--; + i++; + } +#endif + + trace_buffer_restore(tflags); +#endif +#endif +} +EXPORT_SYMBOL(dump_bfin_trace_buffer); + +void dump_bfin_process(struct pt_regs *fp) +{ +#ifdef CONFIG_DEBUG_VERBOSE + /* 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) + verbose_printk(KERN_EMERG "Kernel OOPS in progress\n"); + + if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) + verbose_printk(KERN_NOTICE "HW Error context\n"); + else if (context & 0x0020) + verbose_printk(KERN_NOTICE "Deferred Exception context\n"); + else if (context & 0x3FC0) + verbose_printk(KERN_NOTICE "Interrupt context\n"); + else if (context & 0x4000) + verbose_printk(KERN_NOTICE "Deferred Interrupt context\n"); + else if (context & 0x8000) + verbose_printk(KERN_NOTICE "Kernel process context\n"); + + /* Because we are crashing, and pointers could be bad, we check things + * pretty closely before we use them + */ + if ((unsigned long)current >= FIXED_CODE_START && + !((unsigned long)current & 0x3) && current->pid) { + verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n"); + if (current->comm >= (char *)FIXED_CODE_START) + verbose_printk(KERN_NOTICE "COMM=%s PID=%d", + current->comm, current->pid); + else + verbose_printk(KERN_NOTICE "COMM= invalid"); + + printk(KERN_CONT " CPU=%d\n", current_thread_info()->cpu); + if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START) + verbose_printk(KERN_NOTICE + "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n" + " BSS = 0x%p-0x%p USER-STACK = 0x%p\n\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); + else + verbose_printk(KERN_NOTICE "invalid mm\n"); + } else + verbose_printk(KERN_NOTICE + "No Valid process in current context\n"); +#endif +} + +void dump_bfin_mem(struct pt_regs *fp) +{ +#ifdef CONFIG_DEBUG_VERBOSE + unsigned short *addr, *erraddr, val = 0, err = 0; + char sti = 0, buf[6]; + + erraddr = (void *)fp->pc; + + verbose_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)) + verbose_printk(KERN_NOTICE "0x%p: ", addr); + + if (!get_instruction(&val, addr)) { + val = 0; + sprintf(buf, "????"); + } else + sprintf(buf, "%04x", val); + + if (addr == erraddr) { + verbose_printk("[%s]", buf); + err = val; + } else + verbose_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; + } + + verbose_printk("\n"); + + /* Hardware error interrupts can be deferred */ + if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR && + oops_in_progress)){ + verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n"); +#ifndef CONFIG_DEBUG_HWERR + verbose_printk(KERN_NOTICE +"The remaining message may be meaningless\n" +"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) { + verbose_printk(KERN_NOTICE "It might be better to look around here :\n"); + verbose_printk(KERN_NOTICE "-------------------------------------------\n"); + show_regs(fp + 1); + verbose_printk(KERN_NOTICE "-------------------------------------------\n"); + } + } +#endif + } +#endif +} + +void show_regs(struct pt_regs *fp) +{ +#ifdef CONFIG_DEBUG_VERBOSE + char buf[150]; + struct irqaction *action; + unsigned int i; + unsigned long flags = 0; + unsigned int cpu = raw_smp_processor_id(); + unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic(); + + verbose_printk(KERN_NOTICE "\n"); + if (CPUID != bfin_cpuid()) + verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), " + "but running on:0x%04x (Rev %d)\n", + CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid()); + + verbose_printk(KERN_NOTICE "ADSP-%s-0.%d", + CPU, bfin_compiled_revid()); + + if (bfin_compiled_revid() != bfin_revid()) + verbose_printk("(Detected 0.%d)", bfin_revid()); + + verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n", + get_cclk()/1000000, get_sclk()/1000000, +#ifdef CONFIG_MPU + "mpu on" +#else + "mpu off" +#endif + ); + + verbose_printk(KERN_NOTICE "%s", linux_banner); + + verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted()); + verbose_printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx IMASK: %04lx SYSCFG: %04lx\n", + (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg); + if (fp->ipend & EVT_IRPTEN) + verbose_printk(KERN_NOTICE " Global Interrupts Disabled (IPEND[4])\n"); + if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 | + EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR))) + verbose_printk(KERN_NOTICE " Peripheral interrupts masked off\n"); + if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14))) + verbose_printk(KERN_NOTICE " Kernel interrupts masked off\n"); + if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) { + verbose_printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n", + (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14); +#ifdef EBIU_ERRMST + /* If the error was from the EBIU, print it out */ + if (bfin_read_EBIU_ERRMST() & CORE_ERROR) { + verbose_printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n", + bfin_read_EBIU_ERRMST()); + verbose_printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n", + bfin_read_EBIU_ERRADD()); + } +#endif + } + verbose_printk(KERN_NOTICE " EXCAUSE : 0x%lx\n", + fp->seqstat & SEQSTAT_EXCAUSE); + for (i = 2; i <= 15 ; i++) { + if (fp->ipend & (1 << i)) { + if (i != 4) { + decode_address(buf, bfin_read32(EVT0 + 4*i)); + verbose_printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf); + } else + verbose_printk(KERN_NOTICE " interrupts disabled\n"); + } + } + + /* if no interrupts are going off, don't print this out */ + if (fp->ipend & ~0x3F) { + for (i = 0; i < (NR_IRQS - 1); i++) { + if (!in_atomic) + raw_spin_lock_irqsave(&irq_desc[i].lock, flags); + + action = irq_desc[i].action; + if (!action) + goto unlock; + + decode_address(buf, (unsigned int)action->handler); + verbose_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); + verbose_printk(", %s", buf); + } + verbose_printk("\n"); +unlock: + if (!in_atomic) + raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags); + } + } + + decode_address(buf, fp->rete); + verbose_printk(KERN_NOTICE " RETE: %s\n", buf); + decode_address(buf, fp->retn); + verbose_printk(KERN_NOTICE " RETN: %s\n", buf); + decode_address(buf, fp->retx); + verbose_printk(KERN_NOTICE " RETX: %s\n", buf); + decode_address(buf, fp->rets); + verbose_printk(KERN_NOTICE " RETS: %s\n", buf); + decode_address(buf, fp->pc); + verbose_printk(KERN_NOTICE " PC : %s\n", buf); + + if (((long)fp->seqstat & SEQSTAT_EXCAUSE) && + (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) { + decode_address(buf, cpu_pda[cpu].dcplb_fault_addr); + verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf); + decode_address(buf, cpu_pda[cpu].icplb_fault_addr); + verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf); + } + + verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n"); + verbose_printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", + fp->r0, fp->r1, fp->r2, fp->r3); + verbose_printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", + fp->r4, fp->r5, fp->r6, fp->r7); + verbose_printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n", + fp->p0, fp->p1, fp->p2, fp->p3); + verbose_printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n", + fp->p4, fp->p5, fp->fp, (long)fp); + verbose_printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n", + fp->lb0, fp->lt0, fp->lc0); + verbose_printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n", + fp->lb1, fp->lt1, fp->lc1); + verbose_printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n", + fp->b0, fp->l0, fp->m0, fp->i0); + verbose_printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n", + fp->b1, fp->l1, fp->m1, fp->i1); + verbose_printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n", + fp->b2, fp->l2, fp->m2, fp->i2); + verbose_printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n", + fp->b3, fp->l3, fp->m3, fp->i3); + verbose_printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n", + fp->a0w, fp->a0x, fp->a1w, fp->a1x); + + verbose_printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n", + rdusp(), fp->astat); + + verbose_printk(KERN_NOTICE "\n"); +#endif +} |