diff options
Diffstat (limited to 'arch/arm/cpu/interrupts_32.c')
| -rw-r--r-- | arch/arm/cpu/interrupts_32.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/arch/arm/cpu/interrupts_32.c b/arch/arm/cpu/interrupts_32.c new file mode 100644 index 0000000000..468dcdd30e --- /dev/null +++ b/arch/arm/cpu/interrupts_32.c @@ -0,0 +1,183 @@ +// SPDX-License-Identifier: GPL-2.0-only +// SPDX-FileCopyrightText: 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix + +/** + * @file + * @brief Interrupt Support Routines + */ + +#include <common.h> +#include <abort.h> +#include <linux/sizes.h> +#include <asm/ptrace.h> +#include <asm/barebox-arm.h> +#include <asm/unwind.h> +#include <init.h> + +/* Avoid missing prototype warning, called from assembly */ +void do_undefined_instruction (struct pt_regs *pt_regs); +void do_software_interrupt (struct pt_regs *pt_regs); +void do_prefetch_abort (struct pt_regs *pt_regs); +void do_data_abort (struct pt_regs *pt_regs); +void do_fiq (struct pt_regs *pt_regs); +void do_irq (struct pt_regs *pt_regs); + +/** + * Display current register set content + * @param[in] regs Guess what + */ +void show_regs (struct pt_regs *regs) +{ + unsigned long flags; + const char *processor_modes[] = { + "USER_26", "FIQ_26", "IRQ_26", "SVC_26", + "UK4_26", "UK5_26", "UK6_26", "UK7_26", + "UK8_26", "UK9_26", "UK10_26", "UK11_26", + "UK12_26", "UK13_26", "UK14_26", "UK15_26", + "USER_32", "FIQ_32", "IRQ_32", "SVC_32", + "UK4_32", "UK5_32", "UK6_32", "ABT_32", + "UK8_32", "UK9_32", "UK10_32", "UND_32", + "UK12_32", "UK13_32", "UK14_32", "SYS_32", + }; + + flags = condition_codes (regs); + + printf ("pc : [<%08lx>] lr : [<%08lx>]\n" + "sp : %08lx ip : %08lx fp : %08lx\n", + instruction_pointer (regs), + regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); + printf ("r10: %08lx r9 : %08lx r8 : %08lx\n", + regs->ARM_r10, regs->ARM_r9, regs->ARM_r8); + printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", + regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4); + printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", + regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0); + printf ("Flags: %c%c%c%c", + flags & PSR_N_BIT ? 'N' : 'n', + flags & PSR_Z_BIT ? 'Z' : 'z', + flags & PSR_C_BIT ? 'C' : 'c', flags & PSR_V_BIT ? 'V' : 'v'); + printf (" IRQs %s FIQs %s Mode %s%s\n", + interrupts_enabled (regs) ? "on" : "off", + fast_interrupts_enabled (regs) ? "on" : "off", + processor_modes[processor_mode (regs)], + thumb_mode (regs) ? " (T)" : ""); +#ifdef CONFIG_ARM_UNWIND + unwind_backtrace(regs); +#endif +} + +static void __noreturn do_exception(struct pt_regs *pt_regs) +{ + show_regs(pt_regs); + + panic_no_stacktrace(""); +} + +/** + * The CPU runs into an undefined instruction. That really should not happen! + * @param[in] pt_regs Register set content when the accident happens + */ +void do_undefined_instruction (struct pt_regs *pt_regs) +{ + printf ("undefined instruction\n"); + do_exception(pt_regs); +} + +/** + * The CPU catches a software interrupt + * @param[in] pt_regs Register set content when the interrupt happens + * + * There is no function behind this feature. So what to do else than + * a reset? + */ +void do_software_interrupt (struct pt_regs *pt_regs) +{ + printf ("software interrupt\n"); + do_exception(pt_regs); +} + +/** + * The CPU catches a prefetch abort. That really should not happen! + * @param[in] pt_regs Register set content when the accident happens + * + * instruction fetch from an unmapped area + */ +void do_prefetch_abort (struct pt_regs *pt_regs) +{ + printf ("prefetch abort\n"); + do_exception(pt_regs); +} + +static const char *data_abort_reason(ulong far) +{ + ulong guard_page; + + if (far < PAGE_SIZE) + return "NULL pointer dereference"; + + if (IS_ENABLED(CONFIG_STACK_GUARD_PAGE)) { + guard_page = arm_mem_guard_page_get(); + if (guard_page <= far && far < guard_page + PAGE_SIZE) + return "stack overflow"; + } + + return "paging request"; +} + +/** + * The CPU catches a data abort. That really should not happen! + * @param[in] pt_regs Register set content when the accident happens + * + * data fetch from an unmapped area + */ +void do_data_abort (struct pt_regs *pt_regs) +{ + u32 far; + + asm volatile ("mrc p15, 0, %0, c6, c0, 0" : "=r" (far) : : "cc"); + + printf("unable to handle %s at address 0x%08x\n", + data_abort_reason(far), far); + + do_exception(pt_regs); +} + +/** + * The CPU catches a fast interrupt request. + * @param[in] pt_regs Register set content when the interrupt happens + * + * We never enable FIQs, so this should not happen + */ +void do_fiq (struct pt_regs *pt_regs) +{ + printf ("fast interrupt request\n"); + do_exception(pt_regs); +} + +/** + * The CPU catches a regular interrupt. + * @param[in] pt_regs Register set content when the interrupt happens + * + * We never enable interrupts, so this should not happen + */ +void do_irq (struct pt_regs *pt_regs) +{ + printf ("interrupt request\n"); + do_exception(pt_regs); +} + +extern volatile int arm_ignore_data_abort; +extern volatile int arm_data_abort_occurred; + +void data_abort_mask(void) +{ + arm_data_abort_occurred = 0; + arm_ignore_data_abort = 1; +} + +int data_abort_unmask(void) +{ + arm_ignore_data_abort = 0; + + return arm_data_abort_occurred != 0; +} |