193 lines
4.7 KiB
ArmAsm
193 lines
4.7 KiB
ArmAsm
/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Fault handlers for ARCv2
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*
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* Fault handlers for ARCv2 processors.
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*/
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#define _ASMLANGUAGE
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#include <toolchain.h>
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#include <sections.h>
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#include <arch/cpu.h>
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#include <swap_macros.h>
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GTEXT(_Fault)
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GTEXT(__reset)
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GTEXT(__memory_error)
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GTEXT(__instruction_error)
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GTEXT(__ev_machine_check)
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GTEXT(__ev_tlb_miss_i)
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GTEXT(__ev_tlb_miss_d)
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GTEXT(__ev_prot_v)
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GTEXT(__ev_privilege_v)
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GTEXT(__ev_swi)
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GTEXT(__ev_trap)
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GTEXT(__ev_extension)
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GTEXT(__ev_div_zero)
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GTEXT(__ev_dc_error)
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GTEXT(__ev_maligned)
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.balign 4
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SECTION_VAR(BSS, saved_stack_pointer)
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.word 0
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#if CONFIG_RGF_NUM_BANKS == 1
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GDATA(_exception_stack)
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SECTION_VAR(NOINIT, _exception_stack)
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.space 512
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/* note: QUARK_SE_C1000_SS can't afford 512B */
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#else
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GDATA(_firq_stack)
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#endif
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/*
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* @brief Fault handler installed in the fault and reserved vectors
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*/
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SECTION_SUBSEC_FUNC(TEXT,__fault,__memory_error)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__instruction_error)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_machine_check)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_tlb_miss_i)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_tlb_miss_d)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_prot_v)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_privilege_v)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_swi)
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#ifndef CONFIG_IRQ_OFFLOAD
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_trap)
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#endif
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_extension)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_div_zero)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_dc_error)
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_maligned)
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/*
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* Before invoking exception handler, the kernel switches to an exception
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* stack, to save the faulting thread's registers.
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* The exception is fatal and all the kernel can do is just print
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* a diagnostic message and halt.
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*/
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#ifdef CONFIG_ARC_STACK_CHECKING
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push_s r2
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/* disable stack checking */
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lr r2, [_ARC_V2_STATUS32]
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bclr r2, r2, _ARC_V2_STATUS32_SC_BIT
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kflag r2
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pop_s r2
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#endif
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st sp, [saved_stack_pointer]
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#if CONFIG_RGF_NUM_BANKS == 1
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mov_s sp, _exception_stack
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add sp, sp, 512
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#else
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mov_s sp, _firq_stack
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add sp, sp, CONFIG_FIRQ_STACK_SIZE
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#endif
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/* save caller saved registers */
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_create_irq_stack_frame
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lr r0,[_ARC_V2_ERSTATUS]
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st_s r0, [sp, ___isf_t_status32_OFFSET]
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lr r0,[_ARC_V2_ERET]
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st_s r0, [sp, ___isf_t_pc_OFFSET] /* eret into pc */
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jl _Fault
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/* if _Fault returns, restore the registers */
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_pop_irq_stack_frame
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/* now restore the stack */
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ld sp,[saved_stack_pointer]
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rtie
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#ifdef CONFIG_IRQ_OFFLOAD
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GTEXT(_irq_do_offload);
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SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_trap)
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/*
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* Before invoking exception handler, the kernel switches to an exception
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* stack to save the faulting thread's registers.
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* The exception is fatal and all the kernel can do is just print
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* a diagnostic message and halt.
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*/
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#ifdef CONFIG_ARC_STACK_CHECKING
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push_s r2
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/* disable stack checking */
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lr r2, [_ARC_V2_STATUS32]
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bclr r2, r2, _ARC_V2_STATUS32_SC_BIT
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kflag r2
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pop_s r2
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#endif
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/* save caller saved registers */
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_create_irq_stack_frame
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lr r0,[_ARC_V2_ERSTATUS]
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st_s r0, [sp, ___isf_t_status32_OFFSET]
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lr r0,[_ARC_V2_ERET]
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st_s r0, [sp, ___isf_t_pc_OFFSET] /* eret into pc */
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jl _irq_do_offload
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mov_s r1, _kernel
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ld_s r2, [r1, _kernel_offset_to_current]
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/* check if we're a nested interrupt: if so, let the
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* interrupted interrupt handle the reschedule
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*/
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lr r3, [_ARC_V2_AUX_IRQ_ACT]
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/* the OS on ARCv2 always runs in kernel mode, so assume bit31 [U] in
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* AUX_IRQ_ACT is always 0: if the contents of AUX_IRQ_ACT is 0, it
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* means trap was taken from outside an interrupt handler.
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* But if it was inside, let that handler do the swap.
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*/
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breq r3, 0, _trap_check_for_swap
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_trap_return:
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_pop_irq_stack_frame
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rtie
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.balign 4
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_trap_check_for_swap:
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/*
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* Non-preemptible thread ? Do not schedule (see explanation of
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* preempt field in kernel_struct.h).
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*/
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ldh_s r0, [r2, _thread_offset_to_preempt]
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brhs r0, _NON_PREEMPT_THRESHOLD, _trap_return
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/* check if the current thread needs to be rescheduled */
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ld_s r0, [r1, _kernel_offset_to_ready_q_cache]
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breq r0, r2, _trap_return
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_save_callee_saved_regs
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st _CAUSE_RIRQ, [r2, _thread_offset_to_relinquish_cause]
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/* note: Ok to use _CAUSE_RIRQ since everything is saved */
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ld_s r2, [r1, _kernel_offset_to_ready_q_cache]
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st_s r2, [r1, _kernel_offset_to_current]
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/* clear AE bit to forget this was an exception */
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lr r3, [_ARC_V2_STATUS32]
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and r3,r3,(~_ARC_V2_STATUS32_AE)
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kflag r3
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/* pretend lowest priority interrupt happened to use common handler */
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lr r3, [_ARC_V2_AUX_IRQ_ACT]
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or r3,r3,(1<<(CONFIG_NUM_IRQ_PRIO_LEVELS-1)) /* use lowest */
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sr r3, [_ARC_V2_AUX_IRQ_ACT]
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/* Assumption: r2 has current thread */
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b _rirq_common_interrupt_swap
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#endif /* CONFIG_IRQ_OFFLOAD */
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