109 lines
2.8 KiB
ArmAsm
109 lines
2.8 KiB
ArmAsm
/*
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* Copyright (c) 2018 Ding Tao <miyatsu@qq.com>
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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 irq_relay.S
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*
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* @brief IRQ relay vector table and relay handler for Cortex-M0 or
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* Armv8-M baseline SoCs
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*
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* In certain ARMv6-M and Armv8-M baseline cores the vector table address can
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* not be changed. Once the * vector table is occupied by bootloader, there
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* will be no IRQ support in the chainloaded image.
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*
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* This program will link into bootloader, once an interrupt is coming,
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* the bootloader can forward the interrupt to the chainloaded image. This
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* will support DFU on those cores.
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*
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* Note: Currently support mcuboot only.
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* */
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#include <toolchain.h>
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#include <linker/sections.h>
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_ASM_FILE_PROLOGUE
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#if defined(CONFIG_SW_VECTOR_RELAY)
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GDATA(_vector_table_pointer)
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GDATA(_main_stack)
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SECTION_FUNC(vector_relay_handler, __vector_relay_handler)
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mrs r0, ipsr;
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lsls r0, r0, $0x02;
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ldr r1, =_vector_table_pointer;
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ldr r1, [r1];
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adds r1, r1, r0;
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ldr r1, [r1];
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/**
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* The size of IRQ vector is 4 bytes, the offset within vector table
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* is the IRQ number times 4 (aka r0 << 2). As know as the r1 stored
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* the offset of real vector table, thus the (r1 = r1 + r0 << 2) will
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* be the real irq handle vector.
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* */
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bx r1;
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GTEXT(__vector_relay_handler)
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SECTION_FUNC(vector_relay_table, __vector_relay_table)
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.word _main_stack + CONFIG_MAIN_STACK_SIZE
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.word __reset
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.word __vector_relay_handler /* nmi */
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.word __vector_relay_handler /* hard fault */
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler /* svc */
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler /* pendsv */
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.word __vector_relay_handler
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/* End of system exception */
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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.word __vector_relay_handler
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#endif
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