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author | Trygve Laugstøl <trygvis@inamo.no> | 2017-01-25 22:24:18 +0100 |
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committer | Trygve Laugstøl <trygvis@inamo.no> | 2017-01-25 22:29:25 +0100 |
commit | 40e04e3772726829d66c12e69f24b03920d79c67 (patch) | |
tree | 636811bad956798c9d5d22de9e7ba8c799b8d791 /thirdparty/STM32_USB-FS-Device_Lib_V4.0.0/Libraries/CMSIS/Device/ST/STM32L1xx/Source/Templates/TASKING/cstart_thumb2.asm | |
parent | 2fff65aed2477a503c72629d27e2a330d30c02d1 (diff) | |
download | stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.tar.gz stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.tar.bz2 stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.tar.xz stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.zip |
o Moving tinyprintf and stm libraries under thirdparty.
Diffstat (limited to 'thirdparty/STM32_USB-FS-Device_Lib_V4.0.0/Libraries/CMSIS/Device/ST/STM32L1xx/Source/Templates/TASKING/cstart_thumb2.asm')
-rw-r--r-- | thirdparty/STM32_USB-FS-Device_Lib_V4.0.0/Libraries/CMSIS/Device/ST/STM32L1xx/Source/Templates/TASKING/cstart_thumb2.asm | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/thirdparty/STM32_USB-FS-Device_Lib_V4.0.0/Libraries/CMSIS/Device/ST/STM32L1xx/Source/Templates/TASKING/cstart_thumb2.asm b/thirdparty/STM32_USB-FS-Device_Lib_V4.0.0/Libraries/CMSIS/Device/ST/STM32L1xx/Source/Templates/TASKING/cstart_thumb2.asm new file mode 100644 index 0000000..85626cd --- /dev/null +++ b/thirdparty/STM32_USB-FS-Device_Lib_V4.0.0/Libraries/CMSIS/Device/ST/STM32L1xx/Source/Templates/TASKING/cstart_thumb2.asm @@ -0,0 +1,140 @@ + + +;; 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 |