416 lines
10 KiB
ArmAsm
416 lines
10 KiB
ArmAsm
// **********************************************************************
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// * SEGGER Microcontroller GmbH *
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// * The Embedded Experts *
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// **********************************************************************
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// * *
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// * (c) 2014 - 2018 SEGGER Microcontroller GmbH *
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// * (c) 2001 - 2018 Rowley Associates Limited *
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// * *
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// * www.segger.com Support: support@segger.com *
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// * *
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// **********************************************************************
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// * *
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// * All rights reserved. *
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// * *
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// * Redistribution and use in source and binary forms, with or *
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// * without modification, are permitted provided that the following *
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// * conditions are met: *
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// * *
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// * - Redistributions of source code must retain the above copyright *
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// * notice, this list of conditions and the following disclaimer. *
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// * *
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// * - Neither the name of SEGGER Microcontroller GmbH *
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// * nor the names of its contributors may be used to endorse or *
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// * promote products derived from this software without specific *
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// * prior written permission. *
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// * *
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// * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND *
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// * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, *
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// * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
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// * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE *
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// * DISCLAIMED. *
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// * IN NO EVENT SHALL SEGGER Microcontroller GmbH BE LIABLE FOR *
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// * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
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// * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT *
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// * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
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// * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
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// * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
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// * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE *
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// * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH *
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// * DAMAGE. *
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// * *
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// **********************************************************************
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//
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//
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// Preprocessor Definitions
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// ------------------------
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// APP_ENTRY_POINT
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//
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// Defines the application entry point function, if undefined this setting
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// defaults to "main".
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//
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// INITIALIZE_STACK
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//
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// If defined, the contents of the stack will be initialized to a the
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// value 0xCC.
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//
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// INITIALIZE_SECONDARY_SECTIONS
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//
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// If defined, the .data2, .text2, .rodata2 and .bss2 sections will be initialized.
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//
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// INITIALIZE_TCM_SECTIONS
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//
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// If defined, the .data_tcm, .text_tcm, .rodata_tcm and .bss_tcm sections
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// will be initialized.
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//
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// INITIALIZE_USER_SECTIONS
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//
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// If defined, the function InitializeUserMemorySections will be called prior
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// to entering main in order to allow the user to initialize any user defined
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// memory sections.
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//
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// FULL_LIBRARY
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//
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// If defined then
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// - argc, argv are setup by the debug_getargs.
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// - the exit symbol is defined and executes on return from main.
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// - the exit symbol calls destructors, atexit functions and then debug_exit.
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//
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// If not defined then
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// - argc and argv are zero.
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// - the exit symbol is defined, executes on return from main and loops
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//
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#ifndef APP_ENTRY_POINT
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#define APP_ENTRY_POINT main
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#endif
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#ifndef ARGSSPACE
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#define ARGSSPACE 128
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#endif
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.syntax unified
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.global _start
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.extern APP_ENTRY_POINT
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.global exit
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.weak exit
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#ifdef INITIALIZE_USER_SECTIONS
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.extern InitializeUserMemorySections
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#endif
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.section .init, "ax"
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.code 16
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.balign 2
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.thumb_func
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_start:
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/* Set up main stack if size > 0 */
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ldr r1, =__stack_end__
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ldr r0, =__stack_start__
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subs r2, r1, r0
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beq 1f
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#ifdef __ARM_EABI__
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movs r2, #0x7
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bics r1, r2
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#endif
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mov sp, r1
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#ifdef INITIALIZE_STACK
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movs r2, #0xCC
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ldr r0, =__stack_start__
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bl memory_set
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#endif
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1:
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/* Set up process stack if size > 0 */
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ldr r1, =__stack_process_end__
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ldr r0, =__stack_process_start__
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subs r2, r1, r0
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beq 1f
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#ifdef __ARM_EABI__
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movs r2, #0x7
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bics r1, r2
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#endif
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msr psp, r1
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movs r2, #2
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msr control, r2
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#ifdef INITIALIZE_STACK
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movs r2, #0xCC
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bl memory_set
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#endif
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1:
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/* Copy initialized memory sections into RAM (if necessary). */
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ldr r0, =__data_load_start__
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ldr r1, =__data_start__
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ldr r2, =__data_end__
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bl memory_copy
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ldr r0, =__text_load_start__
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ldr r1, =__text_start__
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ldr r2, =__text_end__
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bl memory_copy
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ldr r0, =__fast_load_start__
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ldr r1, =__fast_start__
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ldr r2, =__fast_end__
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bl memory_copy
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ldr r0, =__ctors_load_start__
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ldr r1, =__ctors_start__
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ldr r2, =__ctors_end__
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bl memory_copy
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ldr r0, =__dtors_load_start__
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ldr r1, =__dtors_start__
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ldr r2, =__dtors_end__
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bl memory_copy
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ldr r0, =__rodata_load_start__
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ldr r1, =__rodata_start__
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ldr r2, =__rodata_end__
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bl memory_copy
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ldr r0, =__tdata_load_start__
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ldr r1, =__tdata_start__
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ldr r2, =__tdata_end__
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bl memory_copy
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#ifdef INITIALIZE_SECONDARY_SECTIONS
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ldr r0, =__data2_load_start__
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ldr r1, =__data2_start__
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ldr r2, =__data2_end__
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bl memory_copy
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ldr r0, =__text2_load_start__
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ldr r1, =__text2_start__
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ldr r2, =__text2_end__
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bl memory_copy
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ldr r0, =__rodata2_load_start__
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ldr r1, =__rodata2_start__
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ldr r2, =__rodata2_end__
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bl memory_copy
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#endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */
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#ifdef INITIALIZE_TCM_SECTIONS
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ldr r0, =__data_tcm_load_start__
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ldr r1, =__data_tcm_start__
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ldr r2, =__data_tcm_end__
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bl memory_copy
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ldr r0, =__text_tcm_load_start__
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ldr r1, =__text_tcm_start__
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ldr r2, =__text_tcm_end__
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bl memory_copy
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ldr r0, =__rodata_tcm_load_start__
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ldr r1, =__rodata_tcm_start__
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ldr r2, =__rodata_tcm_end__
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bl memory_copy
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#endif /* #ifdef INITIALIZE_TCM_SECTIONS */
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/* Zero the bss. */
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ldr r0, =__bss_start__
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ldr r1, =__bss_end__
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movs r2, #0
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bl memory_set
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ldr r0, =__tbss_start__
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ldr r1, =__tbss_end__
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movs r2, #0
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bl memory_set
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#ifdef INITIALIZE_SECONDARY_SECTIONS
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ldr r0, =__bss2_start__
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ldr r1, =__bss2_end__
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mov r2, #0
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bl memory_set
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#endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */
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#ifdef INITIALIZE_TCM_SECTIONS
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ldr r0, =__bss_tcm_start__
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ldr r1, =__bss_tcm_end__
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mov r2, #0
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bl memory_set
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#endif /* #ifdef INITIALIZE_TCM_SECTIONS */
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/* Initialize the heap */
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ldr r0, = __heap_start__
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ldr r1, = __heap_end__
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subs r1, r1, r0
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cmp r1, #8
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blt 1f
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movs r2, #0
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str r2, [r0]
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adds r0, r0, #4
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str r1, [r0]
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1:
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#ifdef INITIALIZE_USER_SECTIONS
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ldr r2, =InitializeUserMemorySections
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blx r2
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#endif
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/* Call constructors */
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ldr r0, =__ctors_start__
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ldr r1, =__ctors_end__
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ctor_loop:
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cmp r0, r1
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beq ctor_end
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ldr r2, [r0]
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adds r0, #4
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push {r0-r1}
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blx r2
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pop {r0-r1}
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b ctor_loop
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ctor_end:
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/* Setup initial call frame */
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movs r0, #0
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mov lr, r0
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mov r12, sp
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.type start, function
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start:
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/* Jump to application entry point */
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#ifdef FULL_LIBRARY
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movs r0, #ARGSSPACE
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ldr r1, =args
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ldr r2, =debug_getargs
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blx r2
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ldr r1, =args
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#else
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movs r0, #0
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movs r1, #0
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#endif
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ldr r2, =APP_ENTRY_POINT
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blx r2
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.thumb_func
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exit:
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#ifdef FULL_LIBRARY
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mov r5, r0 // save the exit parameter/return result
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/* Call destructors */
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ldr r0, =__dtors_start__
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ldr r1, =__dtors_end__
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dtor_loop:
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cmp r0, r1
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beq dtor_end
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ldr r2, [r0]
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add r0, #4
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push {r0-r1}
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blx r2
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pop {r0-r1}
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b dtor_loop
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dtor_end:
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/* Call atexit functions */
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ldr r2, =_execute_at_exit_fns
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blx r2
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/* Call debug_exit with return result/exit parameter */
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mov r0, r5
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ldr r2, =debug_exit
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blx r2
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#endif
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/* Returned from application entry point, loop forever. */
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exit_loop:
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b exit_loop
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.thumb_func
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memory_copy:
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cmp r0, r1
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beq 2f
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subs r2, r2, r1
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beq 2f
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1:
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ldrb r3, [r0]
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adds r0, r0, #1
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strb r3, [r1]
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adds r1, r1, #1
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subs r2, r2, #1
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bne 1b
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2:
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bx lr
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.thumb_func
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memory_set:
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cmp r0, r1
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beq 1f
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strb r2, [r0]
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adds r0, r0, #1
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b memory_set
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1:
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bx lr
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// default C/C++ library helpers
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.macro HELPER helper_name
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.section .text.\helper_name, "ax", %progbits
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.balign 2
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.global \helper_name
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.weak \helper_name
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\helper_name:
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.thumb_func
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.endm
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.macro JUMPTO name
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#if defined(__thumb__) && !defined(__thumb2__)
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mov r12, r0
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ldr r0, =\name
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push {r0}
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mov r0, r12
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pop {pc}
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#else
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b \name
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#endif
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.endm
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HELPER __aeabi_read_tp
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ldr r0, =__tbss_start__-8
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bx lr
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HELPER abort
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b .
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HELPER __assert
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b .
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HELPER __aeabi_assert
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b .
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HELPER __sync_synchronize
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bx lr
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HELPER __getchar
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JUMPTO debug_getchar
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HELPER __putchar
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JUMPTO debug_putchar
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HELPER __open
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JUMPTO debug_fopen
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HELPER __close
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JUMPTO debug_fclose
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HELPER __write
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mov r3, r0
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mov r0, r1
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movs r1, #1
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JUMPTO debug_fwrite
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HELPER __read
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mov r3, r0
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mov r0, r1
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movs r1, #1
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JUMPTO debug_fread
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HELPER __seek
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push {r4, lr}
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mov r4, r0
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bl debug_fseek
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cmp r0, #0
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bne 1f
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mov r0, r4
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bl debug_ftell
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pop {r4, pc}
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1:
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ldr r0, =-1
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pop {r4, pc}
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// char __user_locale_name_buffer[];
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.section .bss.__user_locale_name_buffer, "aw", %nobits
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.global __user_locale_name_buffer
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.weak __user_locale_name_buffer
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__user_locale_name_buffer:
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.word 0x0
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#ifdef FULL_LIBRARY
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.bss
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args:
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.space ARGSSPACE
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#endif
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/* Setup attibutes of stack and heap sections so they don't take up room in the elf file */
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.section .stack, "wa", %nobits
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.section .stack_process, "wa", %nobits
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.section .heap, "wa", %nobits
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