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https://github.com/tillitis/tillitis-key1.git
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8f2f312531
In order to be able to leave data for firmware signalling the intention with a reset or to leave data for the next app in a chain of apps, we introduce a part of FW_RAM that can be used to store this data. In order to do this, we: - Change size of ROM from 6 KB to 8 KB. - Change size of FW_RAM, from 2 KB to 4 KB. - Add RESETINFO memory partition inside FW_RAM. - Add generation of map file. - Change CFLAGS from using -O2 to using -Os. - Update address ranges for valid access to ROM and FW_RAM. - Move stack to be located before data+bss and the RESETINFO data above them. This also means we introduce hardware stack overflow protection through the Security Monitor. - Revise firmware README to the new use of FW_RAM.
65 lines
752 B
ArmAsm
65 lines
752 B
ArmAsm
/*
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* Copyright (C) 2022, 2023 - Tillitis AB
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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.section ".text.init"
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.globl _start
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_start:
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li x1, 0
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li x2, 0
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li x3, 0
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li x4, 0
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li x5, 0
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li x6, 0
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li x7, 0
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li x8, 0
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li x9, 0
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li x10,0
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li x11,0
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li x12,0
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li x13,0
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li x14,0
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li x15,0
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li x16,0
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li x17,0
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li x18,0
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li x19,0
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li x20,0
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li x21,0
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li x22,0
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li x23,0
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li x24,0
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li x25,0
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li x26,0
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li x27,0
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li x28,0
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li x29,0
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li x30,0
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li x31,0
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/* Clear FW_RAM */
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la a0, _sfwram
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la a1, _efwram
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clear:
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sw zero, 0(a0)
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addi a0, a0, 4
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blt a0, a1, clear
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/* Zero-init bss section */
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la a0, _sbss
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la a1, _ebss
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loop_init_bss:
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sw zero, 0(a0)
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addi a0, a0, 4
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blt a0, a1, loop_init_bss
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/* Init stack */
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la sp, _estack
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call main
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loop:
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j loop
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