diff options
author | Arnd Bergmann <arnd@arndb.de> | 2018-03-07 22:23:24 +0100 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2018-03-16 10:55:47 +0100 |
commit | 4ba66a9760722ccbb691b8f7116cad2f791cca7b (patch) | |
tree | e29f9624ad0b13aa11860e39440bbc5e24d18a30 /arch/blackfin/kernel/traps.c | |
parent | b8c9c8f0190f4004d3d4364edb2dea5978dfc824 (diff) | |
download | blackbird-obmc-linux-4ba66a9760722ccbb691b8f7116cad2f791cca7b.tar.gz blackbird-obmc-linux-4ba66a9760722ccbb691b8f7116cad2f791cca7b.zip |
arch: remove blackfin port
The Analog Devices Blackfin port was added in 2007 and was rather
active for a while, but all work on it has come to a standstill
over time, as Analog have changed their product line-up.
Aaron Wu confirmed that the architecture port is no longer relevant,
and multiple people suggested removing blackfin independently because
of some of its oddities like a non-working SMP port, and the amount of
duplication between the chip variants, which cause extra work when
doing cross-architecture changes.
Link: https://docs.blackfin.uclinux.org/
Acked-by: Aaron Wu <Aaron.Wu@analog.com>
Acked-by: Bryan Wu <cooloney@gmail.com>
Cc: Steven Miao <realmz6@gmail.com>
Cc: Mike Frysinger <vapier@chromium.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/blackfin/kernel/traps.c')
-rw-r--r-- | arch/blackfin/kernel/traps.c | 585 |
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 |