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100 lines
1.7 KiB
ArmAsm
100 lines
1.7 KiB
ArmAsm
.section ".uart", "ax"
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.arm
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.global _uart_header
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.type _uart_header, %function
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_uart_header:
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// header area of payload
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// command
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.word 0
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.word 0
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// length of command payload in ASCII (9e)
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.word 0x6539
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// dataBuf, just fill with zeros
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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// r3 = UART_Read ptr
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.word 0x0200DA4C
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// r4 = payload length (UART_Read r1)
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// provided in linkerscript
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.word __data_size
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// r5-r7
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.word 0
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.word 0
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.word 0
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// r8 - destination address (UART_Read r0)
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.word _start
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// r9
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.word 0
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// pc -> gadget
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.word 0x0201DE98
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// stack for "pop {r4-r8,pc}" at 0x0201DEB4
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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// stack pc -> entrypoint, usually equal to dest addr (at 0x84)
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.word _start
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.section ".crt0", "ax"
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.arm
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.global _start
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.type _start, %function
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_start:
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// disable irqs
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mov r0, #0x04000000
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str r0, [r0, #0x208]
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// configure cp15
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// disable itcm, dtcm, caches and mpu
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ldr r0,= 0x00002078
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mcr p15, 0, r0, c1, c0
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mov r0, #0
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// invalidate entire icache
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mcr p15, 0, r0, c7, c5, 0
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// invalidate entire dcache
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mcr p15, 0, r0, c7, c6, 0
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// drain write buffer
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mcr p15, 0, r0, c7, c10, 4
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// clear bss
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ldr r0,= __bss_start
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ldr r1,= __bss_end
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cmp r0, r1
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beq bss_done
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mov r2, #0
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1:
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str r2, [r0], #4
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cmp r0, r1
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bne 1b
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bss_done:
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b main
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.pool
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.end
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