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Diffstat (limited to 'arch/blackfin/kernel/traps.c')
-rw-r--r--arch/blackfin/kernel/traps.c585
1 files changed, 0 insertions, 585 deletions
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
deleted file mode 100644
index a323a40a46e9..000000000000
--- a/arch/blackfin/kernel/traps.c
+++ /dev/null
@@ -1,585 +0,0 @@
-/*
- * Main exception handling logic.
- *
- * Copyright 2004-2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later
- */
-
-#include <linux/bug.h>
-#include <linux/uaccess.h>
-#include <linux/module.h>
-#include <linux/sched/signal.h>
-#include <linux/sched/debug.h>
-#include <asm/traps.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/pseudo_instructions.h>
-#include <asm/pda.h>
-#include <asm/asm-offsets.h>
-
-#ifdef CONFIG_KGDB
-# include <linux/kgdb.h>
-
-# define CHK_DEBUGGER_TRAP() \
- do { \
- kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
- } while (0)
-# define CHK_DEBUGGER_TRAP_MAYBE() \
- do { \
- if (kgdb_connected) \
- CHK_DEBUGGER_TRAP(); \
- } while (0)
-#else
-# define CHK_DEBUGGER_TRAP() do { } while (0)
-# 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)
-{
- CSYNC();
- bfin_write_EVT3(trap);
- CSYNC();
-}
-
-static int kernel_mode_regs(struct pt_regs *regs)
-{
- return regs->ipend & 0xffc0;
-}
-
-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
- */
-
- /* 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
- */
- fp->orig_pc = fp->retx;
- /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
- trapnr, fp->ipend, fp->pc, fp->retx); */
-
- /* send the appropriate signal to the user program */
- switch (trapnr) {
-
- /* 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
- * handled in assembly/exception space, and the error path is handled
- * here
- */
-
- /* 0x00 - Linux Syscall, getting here is an error */
- /* 0x01 - userspace gdb breakpoint, handled here */
- case VEC_EXCPT01:
- info.si_code = TRAP_ILLTRAP;
- sig = SIGTRAP;
- CHK_DEBUGGER_TRAP_MAYBE();
- /* Check if this is a breakpoint in kernel space */
- if (kernel_mode_regs(fp))
- goto traps_done;
- else
- break;
- /* 0x03 - User Defined, userspace stack overflow */
- case VEC_EXCPT03:
- info.si_code = SEGV_STACKFLOW;
- sig = SIGSEGV;
- 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;
- /* 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 (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;
- strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
- CHK_DEBUGGER_TRAP_MAYBE();
- break;
- /* 0x12 - Reserved, Caught by default */
- /* 0x13 - Reserved, Caught by default */
- /* 0x14 - Reserved, Caught by default */
- /* 0x15 - Reserved, Caught by default */
- /* 0x16 - Reserved, Caught by default */
- /* 0x17 - Reserved, Caught by default */
- /* 0x18 - Reserved, Caught by default */
- /* 0x19 - Reserved, Caught by default */
- /* 0x1A - Reserved, Caught by default */
- /* 0x1B - Reserved, Caught by default */
- /* 0x1C - Reserved, Caught by default */
- /* 0x1D - Reserved, Caught by default */
- /* 0x1E - Reserved, Caught by default */
- /* 0x1F - Reserved, Caught by default */
- /* 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;
- 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;
- 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 = 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;
- 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;
- 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;
- 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;
- sig = SIGSEGV;
-#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
- strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
- CHK_DEBUGGER_TRAP_MAYBE();
- break;
- /* 0x28 - Emulation Watchpoint, handled here */
- case VEC_WATCH:
- info.si_code = TRAP_WATCHPT;
- sig = SIGTRAP;
- pr_debug(EXC_0x28(KERN_DEBUG));
- CHK_DEBUGGER_TRAP_MAYBE();
- /* Check if this is a watchpoint in kernel space */
- if (kernel_mode_regs(fp))
- goto traps_done;
- else
- break;
-#ifdef CONFIG_BF535
- /* 0x29 - Instruction fetch access error (535 only) */
- case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
- info.si_code = BUS_OPFETCH;
- sig = SIGBUS;
- strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
- CHK_DEBUGGER_TRAP_MAYBE();
- break;
-#else
- /* 0x29 - Reserved, Caught by default */
-#endif
- /* 0x2A - Instruction fetch misaligned, handled here */
- case VEC_MISALI_I:
- info.si_code = BUS_ADRALN;
- sig = SIGBUS;
- 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;
- 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;
- 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;
- sig = SIGSEGV;
-#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
- 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;
- strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
- CHK_DEBUGGER_TRAP_MAYBE();
- break;
- /* 0x2F - Reserved, Caught by default */
- /* 0x30 - Reserved, Caught by default */
- /* 0x31 - Reserved, Caught by default */
- /* 0x32 - Reserved, Caught by default */
- /* 0x33 - Reserved, Caught by default */
- /* 0x34 - Reserved, Caught by default */
- /* 0x35 - Reserved, Caught by default */
- /* 0x36 - Reserved, Caught by default */
- /* 0x37 - Reserved, Caught by default */
- /* 0x38 - Reserved, Caught by default */
- /* 0x39 - Reserved, Caught by default */
- /* 0x3A - Reserved, Caught by default */
- /* 0x3B - Reserved, Caught by default */
- /* 0x3C - Reserved, Caught by default */
- /* 0x3D - Reserved, Caught by default */
- /* 0x3E - Reserved, Caught by default */
- /* 0x3F - Reserved, Caught by default */
- case VEC_HWERR:
- info.si_code = BUS_ADRALN;
- sig = SIGBUS;
- switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
- /* System MMR Error */
- case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
- info.si_code = BUS_ADRALN;
- sig = SIGBUS;
- 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;
- strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
- break;
- /* Performance Monitor Overflow */
- case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
- strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
- break;
- /* RAISE 5 instruction */
- case (SEQSTAT_HWERRCAUSE_RAISE_5):
- printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
- break;
- default: /* Reserved */
- printk(KERN_NOTICE HWC_default(KERN_NOTICE));
- break;
- }
- 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 = ILL_ILLPARAOP;
- sig = SIGILL;
- verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
- (fp->seqstat & SEQSTAT_EXCAUSE));
- 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) {
- if (strerror)
- verbose_printk(strerror);
-
- dump_bfin_process(fp);
- 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)
- 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();
-
- 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
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-23 13:00:10 +0300