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86 lines
2.2 KiB
86 lines
2.2 KiB
/*
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SPDX-FileCopyrightText: 2020 Foundation Devices, Inc. <hello@foundationdevices.com>
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SPDX-License-Identifier: GPL-3.0-or-later
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SPDX-FileCopyrightText: 2018 Coinkite, Inc. <coldcardwallet.com>
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SPDX-License-Identifier: GPL-3.0-only
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*/
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.thumb
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.syntax unified
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.global Reset_Handler
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.type Reset_Handler, %function
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Reset_Handler:
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/* Load the stack pointer */
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ldr sp, =_estack
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/* Initialise the data section */
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ldr r1, =_sidata
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ldr r2, =_sdata
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ldr r3, =_edata
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b .data_copy_entry
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.data_copy_loop:
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ldr r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */
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str r0, [r2], #4
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.data_copy_entry:
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cmp r2, r3
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bcc .data_copy_loop
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/* Zero out the BSS section */
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movs r0, #0
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ldr r1, =_sbss
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ldr r2, =_ebss
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b .bss_zero_entry
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.bss_zero_loop:
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str r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */
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.bss_zero_entry:
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cmp r1, r2
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bcc .bss_zero_loop
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/* Initialise the sram section */
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ldr r1, =_siram
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ldr r2, =_sram
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ldr r3, =_eram
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b .ram_copy_entry
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.ram_copy_loop:
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ldr r0, [r1], #4 /* Should be 4-aligned to be as fast as possible */
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str r0, [r2], #4
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.ram_copy_entry:
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cmp r2, r3
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bcc .ram_copy_loop
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bl main
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/*
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* get a ptr to real code
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* load R1 with 0x08020800 value: start of firmware
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*/
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movw r1, (0x08020800 >> 12)
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lsl r1, 12
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orr.w r1, r1, #0x800
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/* set stack pointer to their preference */
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ldr r0, [r1]
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mov sp, r0
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/* Disabled
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* We cannot change to user mode here because the micropython code
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* depends on being in supervisor mode. SystemInit() is invoked
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* from the Reset_Handler() and the vector table (along with other
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* SCB accesses) is set at the start of stm32_main()...both
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* important things in the startup processing.
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*/
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/* We are in supervisor mode out of reset...drop down to user mode */
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/*
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mrs r3, CONTROL
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orr.w r3, r3, #1
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msr CONTROL, r3
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*/
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/* Read reset vector, and jump to it. */
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mov r0, 1 /* set reset_mode arg: 1=normal? */
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ldr lr, [r1, 4]
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bx lr
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.end
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