cregit-Linux how code gets into the kernel

Release 4.14 arch/mn10300/kernel/traps.c

/* MN10300 Exception handling
 *
 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Modified by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/kallsyms.h>
#include <linux/pci.h>
#include <linux/kdebug.h>
#include <linux/bug.h>
#include <linux/irq.h>
#include <linux/export.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/io.h>
#include <linux/atomic.h>
#include <asm/smp.h>
#include <asm/pgalloc.h>
#include <asm/cacheflush.h>
#include <asm/cpu-regs.h>
#include <asm/busctl-regs.h>
#include <unit/leds.h>
#include <asm/fpu.h>
#include <asm/sections.h>
#include <asm/debugger.h>
#include "internal.h"

#if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
#error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
#endif


int kstack_depth_to_print = 24;


spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);


struct exception_to_signal_map {
	
u8	signo;
	
u32	si_code;
};


static const struct exception_to_signal_map exception_to_signal_map[256] = {
	/* MMU exceptions */
	[EXCEP_ITLBMISS >> 3]	= { 0, 0 },
	[EXCEP_DTLBMISS >> 3]	= { 0, 0 },
	[EXCEP_IAERROR >> 3]	= { 0, 0 },
	[EXCEP_DAERROR >> 3]	= { 0, 0 },

	/* system exceptions */
	[EXCEP_TRAP >> 3]	= { SIGTRAP,	TRAP_BRKPT },
	[EXCEP_ISTEP >> 3]	= { SIGTRAP,	TRAP_TRACE },	/* Monitor */
	[EXCEP_IBREAK >> 3]	= { SIGTRAP,	TRAP_HWBKPT },	/* Monitor */
	[EXCEP_OBREAK >> 3]	= { SIGTRAP,	TRAP_HWBKPT },	/* Monitor */
	[EXCEP_PRIVINS >> 3]	= { SIGILL,	ILL_PRVOPC },
	[EXCEP_UNIMPINS >> 3]	= { SIGILL,	ILL_ILLOPC },
	[EXCEP_UNIMPEXINS >> 3]	= { SIGILL,	ILL_ILLOPC },
	[EXCEP_MEMERR >> 3]	= { SIGSEGV,	SEGV_ACCERR },
	[EXCEP_MISALIGN >> 3]	= { SIGBUS,	BUS_ADRALN },
	[EXCEP_BUSERROR >> 3]	= { SIGBUS,	BUS_ADRERR },
	[EXCEP_ILLINSACC >> 3]	= { SIGSEGV,	SEGV_ACCERR },
	[EXCEP_ILLDATACC >> 3]	= { SIGSEGV,	SEGV_ACCERR },
	[EXCEP_IOINSACC >> 3]	= { SIGSEGV,	SEGV_ACCERR },
	[EXCEP_PRIVINSACC >> 3]	= { SIGSEGV,	SEGV_ACCERR }, /* userspace */
	[EXCEP_PRIVDATACC >> 3]	= { SIGSEGV,	SEGV_ACCERR }, /* userspace */
	[EXCEP_DATINSACC >> 3]	= { SIGSEGV,	SEGV_ACCERR },
	[EXCEP_DOUBLE_FAULT >> 3] = { SIGILL,	ILL_BADSTK },

	/* FPU exceptions */
	[EXCEP_FPU_DISABLED >> 3] = { SIGILL,	ILL_COPROC },
	[EXCEP_FPU_UNIMPINS >> 3] = { SIGILL,	ILL_COPROC },
	[EXCEP_FPU_OPERATION >> 3] = { SIGFPE,	FPE_INTDIV },

	/* interrupts */
	[EXCEP_WDT >> 3]	= { SIGALRM,	0 },
	[EXCEP_NMI >> 3]	= { SIGQUIT,	0 },
	[EXCEP_IRQ_LEVEL0 >> 3]	= { SIGINT,	0 },
	[EXCEP_IRQ_LEVEL1 >> 3]	= { 0, 0 },
	[EXCEP_IRQ_LEVEL2 >> 3]	= { 0, 0 },
	[EXCEP_IRQ_LEVEL3 >> 3]	= { 0, 0 },
	[EXCEP_IRQ_LEVEL4 >> 3]	= { 0, 0 },
	[EXCEP_IRQ_LEVEL5 >> 3]	= { 0, 0 },
	[EXCEP_IRQ_LEVEL6 >> 3]	= { 0, 0 },

	/* system calls */
	[EXCEP_SYSCALL0 >> 3]	= { 0, 0 },
	[EXCEP_SYSCALL1 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL2 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL3 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL4 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL5 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL6 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL7 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL8 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL9 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL10 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL11 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL12 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL13 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL14 >> 3]	= { SIGILL,	ILL_ILLTRP },
	[EXCEP_SYSCALL15 >> 3]	= { SIGABRT,	0 },
};

/*
 * Handle kernel exceptions.
 *
 * See if there's a fixup handler we can force a jump to when an exception
 * happens due to something kernel code did
 */

int die_if_no_fixup(const char *str, struct pt_regs *regs, enum exception_code code) { u8 opcode; int signo, si_code; if (user_mode(regs)) return 0; peripheral_leds_display_exception(code); signo = exception_to_signal_map[code >> 3].signo; si_code = exception_to_signal_map[code >> 3].si_code; switch (code) { /* see if we can fixup the kernel accessing memory */ case EXCEP_ITLBMISS: case EXCEP_DTLBMISS: case EXCEP_IAERROR: case EXCEP_DAERROR: case EXCEP_MEMERR: case EXCEP_MISALIGN: case EXCEP_BUSERROR: case EXCEP_ILLDATACC: case EXCEP_IOINSACC: case EXCEP_PRIVINSACC: case EXCEP_PRIVDATACC: case EXCEP_DATINSACC: if (fixup_exception(regs)) return 1; break; case EXCEP_TRAP: case EXCEP_UNIMPINS: if (probe_kernel_read(&opcode, (u8 *)regs->pc, 1) < 0) break; if (opcode == 0xff) { if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0)) return 1; if (at_debugger_breakpoint(regs)) regs->pc++; signo = SIGTRAP; si_code = TRAP_BRKPT; } break; case EXCEP_SYSCALL1 ... EXCEP_SYSCALL14: /* syscall return addr is _after_ the instruction */ regs->pc -= 2; break; case EXCEP_SYSCALL15: if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_WARN) return 1; /* syscall return addr is _after_ the instruction */ regs->pc -= 2; break; default: break; } if (debugger_intercept(code, signo, si_code, regs) == 0) return 1; if (notify_die(DIE_GPF, str, regs, code, 0, 0)) return 1; /* make the process die as the last resort */ die(str, regs, code); }

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David Howells284100.00%3100.00%
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/* * General exception handler */
asmlinkage void handle_exception(struct pt_regs *regs, u32 intcode) { siginfo_t info; /* deal with kernel exceptions here */ if (die_if_no_fixup(NULL, regs, intcode)) return; /* otherwise it's a userspace exception */ info.si_signo = exception_to_signal_map[intcode >> 3].signo; info.si_code = exception_to_signal_map[intcode >> 3].si_code; info.si_errno = 0; info.si_addr = (void *) regs->pc; force_sig_info(info.si_signo, &info, current); }

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David Howells87100.00%1100.00%
Total87100.00%1100.00%

/* * handle NMI */
asmlinkage void nmi(struct pt_regs *regs, enum exception_code code) { /* see if gdbstub wants to deal with it */ if (debugger_intercept(code, SIGQUIT, 0, regs)) return; printk(KERN_WARNING "--- Register Dump ---\n"); show_registers(regs); printk(KERN_WARNING "---------------------\n"); }

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David Howells47100.00%2100.00%
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/* * show a stack trace from the specified stack pointer */
void show_trace(unsigned long *sp) { unsigned long bottom, stack, addr, fp, raslot; printk(KERN_EMERG "\nCall Trace:\n"); //stack = (unsigned long)sp; asm("mov sp,%0" : "=a"(stack)); asm("mov a3,%0" : "=r"(fp)); raslot = ULONG_MAX; bottom = (stack + THREAD_SIZE) & ~(THREAD_SIZE - 1); for (; stack < bottom; stack += sizeof(addr)) { addr = *(unsigned long *)stack; if (stack == fp) { if (addr > stack && addr < bottom) { fp = addr; raslot = stack + sizeof(addr); continue; } fp = 0; raslot = ULONG_MAX; } if (__kernel_text_address(addr)) { printk(" [<%08lx>]", addr); if (stack >= raslot) raslot = ULONG_MAX; else printk(" ?"); print_symbol(" %s", addr); printk("\n"); } } printk("\n"); }

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David Howells167100.00%2100.00%
Total167100.00%2100.00%

/* * show the raw stack from the specified stack pointer */
void show_stack(struct task_struct *task, unsigned long *sp) { unsigned long *stack; int i; if (!sp) sp = (unsigned long *) &sp; stack = sp; printk(KERN_EMERG "Stack:"); for (i = 0; i < kstack_depth_to_print; i++) { if (((long) stack & (THREAD_SIZE - 1)) == 0) break; if ((i % 8) == 0) printk(KERN_EMERG " "); printk("%08lx ", *stack++); } show_trace(sp); }

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David Howells111100.00%1100.00%
Total111100.00%1100.00%

/* * dump the register file in the specified exception frame */
void show_registers_only(struct pt_regs *regs) { unsigned long ssp; ssp = (unsigned long) regs + sizeof(*regs); printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n", regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super"); printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", regs->d0, regs->d1, regs->d2, regs->d3); printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n", regs->a0, regs->a1, regs->a2, regs->a3); printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n", regs->e0, regs->e1, regs->e2, regs->e3); printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n", regs->e4, regs->e5, regs->e6, regs->e7); printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n", regs->lar, regs->lir, regs->mdr, regs->sp); printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n", regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq); printk(KERN_EMERG "threadinfo=%p task=%p)\n", current_thread_info(), current); if ((unsigned long) current >= PAGE_OFFSET && (unsigned long) current < (unsigned long)high_memory) printk(KERN_EMERG "Process %s (pid: %d)\n", current->comm, current->pid); #ifdef CONFIG_SMP printk(KERN_EMERG "CPUID: %08x\n", CPUID); #endif printk(KERN_EMERG "CPUP: %04hx\n", CPUP); printk(KERN_EMERG "TBR: %08x\n", TBR); printk(KERN_EMERG "DEAR: %08x\n", DEAR); printk(KERN_EMERG "sISR: %08x\n", sISR); printk(KERN_EMERG "NMICR: %04hx\n", NMICR); printk(KERN_EMERG "BCBERR: %08x\n", BCBERR); printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR); printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR); printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2); printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2); }

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David Howells329100.00%2100.00%
Total329100.00%2100.00%

/* * dump the registers and the stack */
void show_registers(struct pt_regs *regs) { unsigned long sp; int i; show_registers_only(regs); if (!user_mode(regs)) sp = (unsigned long) regs + sizeof(*regs); else sp = regs->sp; /* when in-kernel, we also print out the stack and code at the * time of the fault.. */ if (!user_mode(regs)) { printk(KERN_EMERG "\n"); show_stack(current, (unsigned long *) sp); #if 0 printk(KERN_EMERG "\nCode: "); if (regs->pc < PAGE_OFFSET) goto bad; for (i = 0; i < 20; i++) { unsigned char c; if (__get_user(c, &((unsigned char *) regs->pc)[i])) goto bad; printk("%02x ", c); } #else i = 0; #endif } printk("\n"); return; #if 0 bad: printk(KERN_EMERG " Bad PC value."); break; #endif }

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David Howells104100.00%2100.00%
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/* * */
void show_trace_task(struct task_struct *tsk) { unsigned long sp = tsk->thread.sp; /* User space on another CPU? */ if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1)) return; show_trace((unsigned long *) sp); }

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David Howells50100.00%2100.00%
Total50100.00%2100.00%

/* * note the untimely death of part of the kernel */
void die(const char *str, struct pt_regs *regs, enum exception_code code) { console_verbose(); spin_lock_irq(&die_lock); printk(KERN_EMERG "\n%s: %04x\n", str, code & 0xffff); show_registers(regs); if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 && (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) { printk(KERN_EMERG "Exception in usermode interrupt handler\n"); printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n"); asm volatile ("0: bra 0b"); } spin_unlock_irq(&die_lock); do_exit(SIGSEGV); }

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David Howells105100.00%3100.00%
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/* * display the register file when the stack pointer gets clobbered */
asmlinkage void do_double_fault(struct pt_regs *regs) { struct task_struct *tsk = current; strcpy(tsk->comm, "emergency tsk"); tsk->pid = 0; console_verbose(); printk(KERN_EMERG "--- double fault ---\n"); show_registers(regs); }

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David Howells47100.00%1100.00%
Total47100.00%1100.00%

/* * asynchronous bus error (external, usually I/O DMA) */
asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs) { console_verbose(); printk(KERN_EMERG "Asynchronous I/O Bus Error\n"); printk(KERN_EMERG "==========================\n"); if (bcberr & BCBERR_BEME) printk(KERN_EMERG "- Multiple recorded errors\n"); printk(KERN_EMERG "- Faulting Buses:%s%s%s\n", bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "", bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "", bcberr & BCBERR_BEMR_DMA ? " DMA" : ""); printk(KERN_EMERG "- %s %s access made to %s at address %08x\n", bcberr & BCBERR_BEBST ? "Burst" : "Single", bcberr & BCBERR_BERW ? "Read" : "Write", bcberr & BCBERR_BESB_MON ? "Monitor Space" : bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" : bcberr & BCBERR_BESB_EX ? "External I/O Bus" : bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" : "On Chip Memory", bcbear ); printk(KERN_EMERG "- Detected by the %s\n", bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus"); #ifdef CONFIG_PCI #define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X))) #define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X))) #define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X))) printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n", *(volatile __u32 *) (0xBFFFFFF4)); printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n", BRIDGEREGL(PCI_BASE_ADDRESS_0)); printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n", BRIDGEREGL(0x48)); printk(KERN_EMERG "- PCI Bridge Command: %04hx\n", BRIDGEREGW(PCI_COMMAND)); printk(KERN_EMERG "- PCI Bridge Status: %04hx\n", BRIDGEREGW(PCI_STATUS)); printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n", BRIDGEREGL(0x4c)); #endif printk(KERN_EMERG "\n"); show_registers(regs); panic("Halted due to asynchronous I/O Bus Error\n"); }

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David Howells24798.41%150.00%
Joe Perches41.59%150.00%
Total251100.00%2100.00%

/* * handle an exception for which a handler has not yet been installed */
asmlinkage void uninitialised_exception(struct pt_regs *regs, enum exception_code code) { /* see if gdbstub wants to deal with it */ if (debugger_intercept(code, SIGSYS, 0, regs) == 0) return; peripheral_leds_display_exception(code); printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF); show_registers(regs); for (;;) continue; }

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David Howells58100.00%2100.00%
Total58100.00%2100.00%

/* * set an interrupt stub to jump to a handler * ! NOTE: this does *not* flush the caches */
void __init __set_intr_stub(enum exception_code code, void *handler) { unsigned long addr; u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code); addr = (unsigned long) handler - (unsigned long) vector; vector[0] = 0xdc; /* JMP handler */ vector[1] = addr; vector[2] = addr >> 8; vector[3] = addr >> 16; vector[4] = addr >> 24; vector[5] = 0xcb; vector[6] = 0xcb; vector[7] = 0xcb; }

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David Howells109100.00%1100.00%
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/* * set an interrupt stub to jump to a handler */
void __init set_intr_stub(enum exception_code code, void *handler) { unsigned long addr; u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code); unsigned long flags; addr = (unsigned long) handler - (unsigned long) vector; flags = arch_local_cli_save(); vector[0] = 0xdc; /* JMP handler */ vector[1] = addr; vector[2] = addr >> 8; vector[3] = addr >> 16; vector[4] = addr >> 24; vector[5] = 0xcb; vector[6] = 0xcb; vector[7] = 0xcb; arch_local_irq_restore(flags); #ifndef CONFIG_MN10300_CACHE_SNOOP mn10300_dcache_flush_inv(); mn10300_icache_inv(); #endif }

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David Howells12089.55%266.67%
Akira Takeuchi1410.45%133.33%
Total134100.00%3100.00%

/* * initialise the exception table */
void __init trap_init(void) { set_excp_vector(EXCEP_TRAP, handle_exception); set_excp_vector(EXCEP_ISTEP, handle_exception); set_excp_vector(EXCEP_IBREAK, handle_exception); set_excp_vector(EXCEP_OBREAK, handle_exception); set_excp_vector(EXCEP_PRIVINS, handle_exception); set_excp_vector(EXCEP_UNIMPINS, handle_exception); set_excp_vector(EXCEP_UNIMPEXINS, handle_exception); set_excp_vector(EXCEP_MEMERR, handle_exception); set_excp_vector(EXCEP_MISALIGN, misalignment); set_excp_vector(EXCEP_BUSERROR, handle_exception); set_excp_vector(EXCEP_ILLINSACC, handle_exception); set_excp_vector(EXCEP_ILLDATACC, handle_exception); set_excp_vector(EXCEP_IOINSACC, handle_exception); set_excp_vector(EXCEP_PRIVINSACC, handle_exception); set_excp_vector(EXCEP_PRIVDATACC, handle_exception); set_excp_vector(EXCEP_DATINSACC, handle_exception); set_excp_vector(EXCEP_FPU_UNIMPINS, handle_exception); set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception); set_excp_vector(EXCEP_NMI, nmi); set_excp_vector(EXCEP_SYSCALL1, handle_exception); set_excp_vector(EXCEP_SYSCALL2, handle_exception); set_excp_vector(EXCEP_SYSCALL3, handle_exception); set_excp_vector(EXCEP_SYSCALL4, handle_exception); set_excp_vector(EXCEP_SYSCALL5, handle_exception); set_excp_vector(EXCEP_SYSCALL6, handle_exception); set_excp_vector(EXCEP_SYSCALL7, handle_exception); set_excp_vector(EXCEP_SYSCALL8, handle_exception); set_excp_vector(EXCEP_SYSCALL9, handle_exception); set_excp_vector(EXCEP_SYSCALL10, handle_exception); set_excp_vector(EXCEP_SYSCALL11, handle_exception); set_excp_vector(EXCEP_SYSCALL12, handle_exception); set_excp_vector(EXCEP_SYSCALL13, handle_exception); set_excp_vector(EXCEP_SYSCALL14, handle_exception); set_excp_vector(EXCEP_SYSCALL15, handle_exception); }

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David Howells246100.00%2100.00%
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/* * determine if a program counter value is a valid bug address */
int is_valid_bugaddr(unsigned long pc) { return pc >= PAGE_OFFSET; }

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David Howells14100.00%1100.00%
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David Howells287999.14%654.55%
Akira Takeuchi140.48%19.09%
Joe Perches40.14%19.09%
Ingo Molnar30.10%19.09%
Geert Uytterhoeven30.10%19.09%
Arun Sharma10.03%19.09%
Total2904100.00%11100.00%
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