URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [CORTEX_MPU_LM3Sxxxx_Rowley/] [thumb_crt0.s] - Rev 610
Go to most recent revision | Compare with Previous | Blame | View Log
/***************************************************************************** * Copyright (c) 2009 Rowley Associates Limited. * * * * This file may be distributed under the terms of the License Agreement * * provided with this software. * * * * THIS FILE IS PROVIDED AS IS WITH NO WARRANTY OF ANY KIND, INCLUDING THE * * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * *****************************************************************************/ /***************************************************************************** * Preprocessor Definitions * ------------------------ * APP_ENTRY_POINT * * Defines the application entry point function, if undefined this setting * defaults to "main". * * USE_PROCESS_STACK * * If defined, thread mode will be configured to use the process stack if * the size of the process stack is greater than zero bytes in length. * * INITIALIZE_STACK * * If defined, the contents of the stack will be initialized to a the * value 0xCC. * * FULL_LIBRARY * * If defined then * - argc, argv are setup by the debug_getargs. * - the exit symbol is defined and executes on return from main. * - the exit symbol calls destructors, atexit functions and then debug_exit. * * If not defined then * - argc and argv are zero. * - no exit symbol, code loops on return from main. *****************************************************************************/ #ifndef APP_ENTRY_POINT #define APP_ENTRY_POINT main #endif #ifndef ARGSSPACE #define ARGSSPACE 128 #endif .global _start .syntax unified .extern APP_ENTRY_POINT #ifdef FULL_LIBRARY .global exit #endif .section .init, "ax" .code 16 .align 2 .thumb_func _start: #ifdef __RAM_BUILD ldr r1, =__stack_end__ mov sp, r1 #endif #ifdef INITIALIZE_STACK mov r2, #0xCC ldr r0, =__stack_start__ #ifndef __RAM_BUILD mov r1, sp #endif bl memory_set #endif #ifdef USE_PROCESS_STACK /* Set up process stack if size > 0 */ ldr r1, =__stack_process_end__ ldr r0, =__stack_process_start__ subs r2, r1, r0 beq 1f msr psp, r1 mov r2, #2 msr control, r2 #ifdef INITIALIZE_STACK mov r2, #0xCC bl memory_set #endif 1: #endif /* Copy initialised memory sections into RAM (if necessary). */ ldr r0, =__data_load_start__ ldr r1, =__data_start__ ldr r2, =__data_end__ bl memory_copy ldr r0, =__text_load_start__ ldr r1, =__text_start__ ldr r2, =__text_end__ bl memory_copy ldr r0, =__fast_load_start__ ldr r1, =__fast_start__ ldr r2, =__fast_end__ bl memory_copy ldr r0, =__ctors_load_start__ ldr r1, =__ctors_start__ ldr r2, =__ctors_end__ bl memory_copy ldr r0, =__dtors_load_start__ ldr r1, =__dtors_start__ ldr r2, =__dtors_end__ bl memory_copy ldr r0, =__rodata_load_start__ ldr r1, =__rodata_start__ ldr r2, =__rodata_end__ bl memory_copy /* Zero the bss. */ ldr r0, =__bss_start__ ldr r1, =__bss_end__ mov r2, #0 bl memory_set /* Zero the privileged data. */ ldr r0, =__privileged_data_start__ ldr r1, =__privileged_data_end__ mov r2, #0 bl memory_set /* Initialise the heap */ ldr r0, = __heap_start__ ldr r1, = __heap_end__ sub r1, r1, r0 mov r2, #0 str r2, [r0] add r0, r0, #4 str r1, [r0] /* Call constructors */ ldr r0, =__ctors_start__ ldr r1, =__ctors_end__ ctor_loop: cmp r0, r1 beq ctor_end ldr r2, [r0] add r0, #4 push {r0-r1} blx r2 pop {r0-r1} b ctor_loop ctor_end: /* Setup initial call frame */ mov r0, #0 mov lr, r0 mov r12, sp start: /* Jump to application entry point */ #ifdef FULL_LIBRARY mov r0, #ARGSSPACE ldr r1, =args ldr r2, =debug_getargs blx r2 ldr r1, =args #else mov r0, #0 mov r1, #0 #endif ldr r2, =APP_ENTRY_POINT blx r2 #ifdef FULL_LIBRARY .thumb_func exit: mov r5, r0 // save the exit parameter/return result /* Call destructors */ ldr r0, =__dtors_start__ ldr r1, =__dtors_end__ dtor_loop: cmp r0, r1 beq dtor_end ldr r2, [r0] add r0, #4 push {r0-r1} blx r2 pop {r0-r1} b dtor_loop dtor_end: /* Call atexit functions */ ldr r2, =_execute_at_exit_fns blx r2 /* Call debug_exit with return result/exit parameter */ mov r0, r5 ldr r2, =debug_exit blx r2 #endif /* Returned from application entry point, loop forever. */ exit_loop: b exit_loop memory_copy: cmp r0, r1 beq 2f subs r2, r2, r1 beq 2f 1: ldrb r3, [r0] add r0, r0, #1 strb r3, [r1] add r1, r1, #1 subs r2, r2, #1 bne 1b 2: bx lr memory_set: cmp r0, r1 beq 1f strb r2, [r0] add r0, r0, #1 b memory_set 1: bx lr #ifdef FULL_LIBRARY .bss args: .space ARGSSPACE #endif
Go to most recent revision | Compare with Previous | Blame | View Log