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Location: therm/libraries/CMSIS/Device/ST/STM32L1xx/Source/Templates/TASKING/cstart_thumb2.asm
fe0367a9a87a
3.6 KiB
text/x-nasm
Added larger font size and removed logos on preheat/etc screens
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;; NOTE: To allow the use of this file for both ARMv6M and ARMv7M,
;; we will only use 16-bit Thumb intructions.
.extern _lc_ub_stack ; usr/sys mode stack pointer
.extern _lc_ue_stack ; symbol required by debugger
.extern _lc_ub_table ; ROM to RAM copy table
.extern main
.extern _Exit
.extern exit
.weak exit
.global __get_argcv
.weak __get_argcv
.extern __argcvbuf
.weak __argcvbuf
;;.extern __init_hardware
.extern SystemInit
.if @defined('__PROF_ENABLE__')
.extern __prof_init
.endif
.if @defined('__POSIX__')
.extern posix_main
.extern _posix_boot_stack_top
.endif
.global _START
.section .text.cstart
.thumb
_START:
;; anticipate possible ROM/RAM remapping
;; by loading the 'real' program address
ldr r1,=_Next
bx r1
_Next:
;; initialize the stack pointer
ldr r1,=_lc_ub_stack ; TODO: make this part of the vector table
mov sp,r1
;; call a user function which initializes function.
bl SystemInit
;; copy initialized sections from ROM to RAM
;; and clear uninitialized data sections in RAM
ldr r3,=_lc_ub_table
movs r0,#0
cploop:
ldr r4,[r3,#0] ; load type
ldr r5,[r3,#4] ; dst address
ldr r6,[r3,#8] ; src address
ldr r7,[r3,#12] ; size
cmp r4,#1
beq copy
cmp r4,#2
beq clear
b done
copy:
subs r7,r7,#1
ldrb r1,[r6,r7]
strb r1,[r5,r7]
bne copy
adds r3,r3,#16
b cploop
clear:
subs r7,r7,#1
strb r0,[r5,r7]
bne clear
adds r3,r3,#16
b cploop
done:
.if @defined('__POSIX__')
;; posix stack buffer for system upbringing
ldr r0,=_posix_boot_stack_top
ldr r0, [r0]
mov sp,r0
.else
;; load r10 with end of USR/SYS stack, which is
;; needed in case stack overflow checking is on
;; NOTE: use 16-bit instructions only, for ARMv6M
ldr r0,=_lc_ue_stack
mov r10,r0
.endif
.if @defined('__PROF_ENABLE__')
bl __prof_init
.endif
.if @defined('__POSIX__')
;; call posix_main with no arguments
bl posix_main
.else
;; retrieve argc and argv (default argv[0]==NULL & argc==0)
bl __get_argcv
ldr r1,=__argcvbuf
;; call main
bl main
.endif
;; call exit using the return value from main()
;; Note. Calling exit will also run all functions
;; that were supplied through atexit().
bl exit
__get_argcv: ; weak definition
movs r0,#0
bx lr
.ltorg
.endsec
.calls '_START', ' '
.calls '_START','__init_vector_table'
.if @defined('__PROF_ENABLE__')
.calls '_START','__prof_init'
.endif
.if @defined('__POSIX__')
.calls '_START','posix_main'
.else
.calls '_START','__get_argcv'
.calls '_START','main'
.endif
.calls '_START','exit'
.calls '_START','',0
.end
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