| /* |
| * Copyright (c) 2014 Wind River Systems, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * @brief Fault handlers for ARCv2 |
| * |
| * Fault handlers for ARCv2 processors. |
| */ |
| |
| #define _ASMLANGUAGE |
| |
| #include <toolchain.h> |
| #include <sections.h> |
| #include <arch/cpu.h> |
| #include "swap_macros.h" |
| |
| GTEXT(_Fault) |
| |
| GTEXT(__reset) |
| GTEXT(__memory_error) |
| GTEXT(__instruction_error) |
| GTEXT(__ev_machine_check) |
| GTEXT(__ev_tlb_miss_i) |
| GTEXT(__ev_tlb_miss_d) |
| GTEXT(__ev_prot_v) |
| GTEXT(__ev_privilege_v) |
| GTEXT(__ev_swi) |
| GTEXT(__ev_trap) |
| GTEXT(__ev_extension) |
| GTEXT(__ev_div_zero) |
| GTEXT(__ev_dc_error) |
| GTEXT(__ev_maligned) |
| GDATA(_firq_stack) |
| |
| SECTION_VAR(BSS, saved_stack_pointer) |
| .word 0 |
| |
| /* |
| * @brief Fault handler installed in the fault and reserved vectors |
| */ |
| |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__memory_error) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__instruction_error) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_machine_check) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_tlb_miss_i) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_tlb_miss_d) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_prot_v) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_privilege_v) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_swi) |
| #ifndef CONFIG_IRQ_OFFLOAD |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_trap) |
| #endif |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_extension) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_div_zero) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_dc_error) |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_maligned) |
| |
| /* |
| * Before invoking exception handler, the kernel switches to an exception |
| * stack, which is really the FIRQ stack, to save the faulting thread's |
| * registers. It can use the FIRQ stack because it knows it is unused |
| * since it is save to assume that if an exception has happened in FIRQ |
| * handler, the problem is fatal and all the kernel can do is just print |
| * a diagnostic message and halt. |
| */ |
| |
| st sp, [saved_stack_pointer] |
| mov_s sp, _firq_stack |
| add sp, sp, CONFIG_FIRQ_STACK_SIZE |
| |
| /* save caller saved registers */ |
| _create_irq_stack_frame |
| |
| jl _Fault |
| |
| /* if _Fault returns, restore the registers */ |
| _pop_irq_stack_frame |
| |
| /* now restore the stack */ |
| ld sp,[saved_stack_pointer] |
| rtie |
| |
| #ifdef CONFIG_IRQ_OFFLOAD |
| GTEXT(_irq_do_offload); |
| |
| SECTION_SUBSEC_FUNC(TEXT,__fault,__ev_trap) |
| /* |
| * Before invoking exception handler, the kernel switches to an exception |
| * stack, which is really the FIRQ stack, to save the faulting thread's |
| * registers. It can use the FIRQ stack because it knows it is unused |
| * since it is save to assume that if an exception has happened in FIRQ |
| * handler, the problem is fatal and all the kernel can do is just print |
| * a diagnostic message and halt. |
| */ |
| |
| st sp, [saved_stack_pointer] |
| mov_s sp, _firq_stack |
| add sp, sp, CONFIG_FIRQ_STACK_SIZE |
| |
| /* save caller saved registers */ |
| _create_irq_stack_frame |
| |
| jl _irq_do_offload |
| |
| /* if _Fault returns, restore the registers */ |
| _pop_irq_stack_frame |
| |
| /* now restore the stack */ |
| ld sp,[saved_stack_pointer] |
| rtie |
| #endif /* CONFIG_IRQ_OFFLOAD */ |
