Sometimes it's useful to test if a memory operation works or aborts. This adds data_abort_mask() to ignore data aborts and data_abort_unmask() to enable them again. This is used in the next step for the 'md' command so that illegal addresses just show 'xxxxxxxx' instead of crashing the system. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
181 lines
4.6 KiB
C
181 lines
4.6 KiB
C
/*
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* interrupts.c - Interrupt Support Routines
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/**
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* @file
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* @brief Interrupt Support Routines
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*/
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#include <common.h>
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#include <abort.h>
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#include <asm/ptrace.h>
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#include <asm/unwind.h>
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/**
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* Display current register set content
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* @param[in] regs Guess what
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*/
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void show_regs (struct pt_regs *regs)
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{
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unsigned long flags;
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const char *processor_modes[] = {
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"USER_26", "FIQ_26", "IRQ_26", "SVC_26",
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"UK4_26", "UK5_26", "UK6_26", "UK7_26",
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"UK8_26", "UK9_26", "UK10_26", "UK11_26",
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"UK12_26", "UK13_26", "UK14_26", "UK15_26",
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"USER_32", "FIQ_32", "IRQ_32", "SVC_32",
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"UK4_32", "UK5_32", "UK6_32", "ABT_32",
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"UK8_32", "UK9_32", "UK10_32", "UND_32",
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"UK12_32", "UK13_32", "UK14_32", "SYS_32",
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};
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flags = condition_codes (regs);
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printf ("pc : [<%08lx>] lr : [<%08lx>]\n"
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"sp : %08lx ip : %08lx fp : %08lx\n",
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instruction_pointer (regs),
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regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
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printf ("r10: %08lx r9 : %08lx r8 : %08lx\n",
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regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
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printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
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regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
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printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
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regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
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printf ("Flags: %c%c%c%c",
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flags & PSR_N_BIT ? 'N' : 'n',
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flags & PSR_Z_BIT ? 'Z' : 'z',
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flags & PSR_C_BIT ? 'C' : 'c', flags & PSR_V_BIT ? 'V' : 'v');
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printf (" IRQs %s FIQs %s Mode %s%s\n",
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interrupts_enabled (regs) ? "on" : "off",
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fast_interrupts_enabled (regs) ? "on" : "off",
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processor_modes[processor_mode (regs)],
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thumb_mode (regs) ? " (T)" : "");
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#ifdef CONFIG_ARM_UNWIND
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unwind_backtrace(regs);
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#endif
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}
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#ifdef CONFIG_ARM_UNWIND
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void dump_stack(void)
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{
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unwind_backtrace(NULL);
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}
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#endif
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static void __noreturn do_exception(struct pt_regs *pt_regs)
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{
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show_regs(pt_regs);
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panic("");
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}
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/**
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* The CPU runs into an undefined instruction. That really should not happen!
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* @param[in] pt_regs Register set content when the accident happens
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*/
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void do_undefined_instruction (struct pt_regs *pt_regs)
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{
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printf ("undefined instruction\n");
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do_exception(pt_regs);
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}
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/**
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* The CPU catches a software interrupt
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* @param[in] pt_regs Register set content when the interrupt happens
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*
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* There is no function behind this feature. So what to do else than
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* a reset?
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*/
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void do_software_interrupt (struct pt_regs *pt_regs)
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{
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printf ("software interrupt\n");
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do_exception(pt_regs);
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}
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/**
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* The CPU catches a prefetch abort. That really should not happen!
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* @param[in] pt_regs Register set content when the accident happens
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*
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* instruction fetch from an unmapped area
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*/
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void do_prefetch_abort (struct pt_regs *pt_regs)
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{
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printf ("prefetch abort\n");
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do_exception(pt_regs);
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}
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/**
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* The CPU catches a data abort. That really should not happen!
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* @param[in] pt_regs Register set content when the accident happens
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*
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* data fetch from an unmapped area
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*/
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void do_data_abort (struct pt_regs *pt_regs)
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{
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u32 far;
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asm volatile ("mrc p15, 0, %0, c6, c0, 0" : "=r" (far) : : "cc");
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printf("unable to handle %s at address 0x%08x\n",
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far < PAGE_SIZE ? "NULL pointer dereference" :
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"paging request", far);
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do_exception(pt_regs);
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}
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/**
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* The CPU catches a fast interrupt request.
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* @param[in] pt_regs Register set content when the interrupt happens
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*
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* We never enable FIQs, so this should not happen
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*/
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void do_fiq (struct pt_regs *pt_regs)
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{
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printf ("fast interrupt request\n");
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do_exception(pt_regs);
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}
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/**
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* The CPU catches a regular interrupt.
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* @param[in] pt_regs Register set content when the interrupt happens
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*
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* We never enable interrupts, so this should not happen
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*/
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void do_irq (struct pt_regs *pt_regs)
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{
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printf ("interrupt request\n");
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do_exception(pt_regs);
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}
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extern volatile int arm_ignore_data_abort;
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extern volatile int arm_data_abort_occurred;
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void data_abort_mask(void)
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{
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arm_data_abort_occurred = 0;
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arm_ignore_data_abort = 1;
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}
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int data_abort_unmask(void)
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{
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arm_ignore_data_abort = 0;
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return arm_data_abort_occurred != 0;
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}
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