segger studio work with ea4357
This commit is contained in:
hathach
420
examples/device/device_virtual_com/segger/thumb_crt0.s
Normal file
420
examples/device/device_virtual_com/segger/thumb_crt0.s
Normal file
@@ -0,0 +1,420 @@
|
||||
// SEGGER Embedded Studio, runtime support.
|
||||
//
|
||||
// Copyright (c) 2014-2017 SEGGER Microcontroller GmbH & Co KG
|
||||
// Copyright (c) 2001-2017 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".
|
||||
//
|
||||
// INITIALIZE_STACK
|
||||
//
|
||||
// If defined, the contents of the stack will be initialized to a the
|
||||
// value 0xCC.
|
||||
//
|
||||
// INITIALIZE_SECONDARY_SECTIONS
|
||||
//
|
||||
// If defined, the .data2, .text2, .rodata2 and .bss2 sections will be initialized.
|
||||
//
|
||||
// INITIALIZE_TCM_SECTIONS
|
||||
//
|
||||
// If defined, the .data_tcm, .text_tcm, .rodata_tcm and .bss_tcm sections
|
||||
// will be initialized.
|
||||
//
|
||||
// INITIALIZE_USER_SECTIONS
|
||||
//
|
||||
// If defined, the function InitializeUserMemorySections will be called prior
|
||||
// to entering main in order to allow the user to initialize any user defined
|
||||
// memory sections.
|
||||
//
|
||||
// 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.
|
||||
// - the exit symbol is defined, executes on return from main and loops
|
||||
//
|
||||
|
||||
#ifndef APP_ENTRY_POINT
|
||||
#define APP_ENTRY_POINT main
|
||||
#endif
|
||||
|
||||
#ifndef ARGSSPACE
|
||||
#define ARGSSPACE 128
|
||||
#endif
|
||||
.syntax unified
|
||||
|
||||
.global _start
|
||||
.extern APP_ENTRY_POINT
|
||||
.global exit
|
||||
.weak exit
|
||||
|
||||
#ifdef INITIALIZE_USER_SECTIONS
|
||||
.extern InitializeUserMemorySections
|
||||
#endif
|
||||
|
||||
.section .init, "ax"
|
||||
.code 16
|
||||
.align 2
|
||||
.thumb_func
|
||||
|
||||
_start:
|
||||
/* Set up main stack if size > 0 */
|
||||
ldr r1, =__stack_end__
|
||||
ldr r0, =__stack_start__
|
||||
subs r2, r1, r0
|
||||
beq 1f
|
||||
#ifdef __ARM_EABI__
|
||||
movs r2, #0x7
|
||||
bics r1, r2
|
||||
#endif
|
||||
mov sp, r1
|
||||
#ifdef INITIALIZE_STACK
|
||||
movs r2, #0xCC
|
||||
ldr r0, =__stack_start__
|
||||
bl memory_set
|
||||
#endif
|
||||
1:
|
||||
|
||||
/* Set up process stack if size > 0 */
|
||||
ldr r1, =__stack_process_end__
|
||||
ldr r0, =__stack_process_start__
|
||||
subs r2, r1, r0
|
||||
beq 1f
|
||||
#ifdef __ARM_EABI__
|
||||
movs r2, #0x7
|
||||
bics r1, r2
|
||||
#endif
|
||||
msr psp, r1
|
||||
movs r2, #2
|
||||
msr control, r2
|
||||
#ifdef INITIALIZE_STACK
|
||||
movs r2, #0xCC
|
||||
bl memory_set
|
||||
#endif
|
||||
1:
|
||||
|
||||
/* Copy initialized 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
|
||||
ldr r0, =__tdata_load_start__
|
||||
ldr r1, =__tdata_start__
|
||||
ldr r2, =__tdata_end__
|
||||
bl memory_copy
|
||||
#ifdef INITIALIZE_SECONDARY_SECTIONS
|
||||
ldr r0, =__data2_load_start__
|
||||
ldr r1, =__data2_start__
|
||||
ldr r2, =__data2_end__
|
||||
bl memory_copy
|
||||
ldr r0, =__text2_load_start__
|
||||
ldr r1, =__text2_start__
|
||||
ldr r2, =__text2_end__
|
||||
bl memory_copy
|
||||
ldr r0, =__rodata2_load_start__
|
||||
ldr r1, =__rodata2_start__
|
||||
ldr r2, =__rodata2_end__
|
||||
bl memory_copy
|
||||
#endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */
|
||||
#ifdef INITIALIZE_TCM_SECTIONS
|
||||
ldr r0, =__data_tcm_load_start__
|
||||
ldr r1, =__data_tcm_start__
|
||||
ldr r2, =__data_tcm_end__
|
||||
bl memory_copy
|
||||
ldr r0, =__text_tcm_load_start__
|
||||
ldr r1, =__text_tcm_start__
|
||||
ldr r2, =__text_tcm_end__
|
||||
bl memory_copy
|
||||
ldr r0, =__rodata_tcm_load_start__
|
||||
ldr r1, =__rodata_tcm_start__
|
||||
ldr r2, =__rodata_tcm_end__
|
||||
bl memory_copy
|
||||
#endif /* #ifdef INITIALIZE_TCM_SECTIONS */
|
||||
|
||||
/* Zero the bss. */
|
||||
ldr r0, =__bss_start__
|
||||
ldr r1, =__bss_end__
|
||||
movs r2, #0
|
||||
bl memory_set
|
||||
ldr r0, =__tbss_start__
|
||||
ldr r1, =__tbss_end__
|
||||
movs r2, #0
|
||||
bl memory_set
|
||||
#ifdef INITIALIZE_SECONDARY_SECTIONS
|
||||
ldr r0, =__bss2_start__
|
||||
ldr r1, =__bss2_end__
|
||||
mov r2, #0
|
||||
bl memory_set
|
||||
#endif /* #ifdef INITIALIZE_SECONDARY_SECTIONS */
|
||||
#ifdef INITIALIZE_TCM_SECTIONS
|
||||
ldr r0, =__bss_tcm_start__
|
||||
ldr r1, =__bss_tcm_end__
|
||||
mov r2, #0
|
||||
bl memory_set
|
||||
#endif /* #ifdef INITIALIZE_TCM_SECTIONS */
|
||||
|
||||
/* Initialize the heap */
|
||||
ldr r0, = __heap_start__
|
||||
ldr r1, = __heap_end__
|
||||
subs r1, r1, r0
|
||||
cmp r1, #8
|
||||
blt 1f
|
||||
movs r2, #0
|
||||
str r2, [r0]
|
||||
adds r0, r0, #4
|
||||
str r1, [r0]
|
||||
1:
|
||||
|
||||
#ifdef INITIALIZE_USER_SECTIONS
|
||||
ldr r2, =InitializeUserMemorySections
|
||||
blx r2
|
||||
#endif
|
||||
|
||||
/* Call constructors */
|
||||
ldr r0, =__ctors_start__
|
||||
ldr r1, =__ctors_end__
|
||||
ctor_loop:
|
||||
cmp r0, r1
|
||||
beq ctor_end
|
||||
ldr r2, [r0]
|
||||
adds r0, #4
|
||||
push {r0-r1}
|
||||
blx r2
|
||||
pop {r0-r1}
|
||||
b ctor_loop
|
||||
ctor_end:
|
||||
|
||||
/* Setup initial call frame */
|
||||
movs r0, #0
|
||||
mov lr, r0
|
||||
mov r12, sp
|
||||
|
||||
.type start, function
|
||||
start:
|
||||
/* Jump to application entry point */
|
||||
#ifdef FULL_LIBRARY
|
||||
movs r0, #ARGSSPACE
|
||||
ldr r1, =args
|
||||
ldr r2, =debug_getargs
|
||||
blx r2
|
||||
ldr r1, =args
|
||||
#else
|
||||
movs r0, #0
|
||||
movs r1, #0
|
||||
#endif
|
||||
ldr r2, =APP_ENTRY_POINT
|
||||
blx r2
|
||||
|
||||
.thumb_func
|
||||
exit:
|
||||
#ifdef FULL_LIBRARY
|
||||
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
|
||||
|
||||
.thumb_func
|
||||
memory_copy:
|
||||
cmp r0, r1
|
||||
beq 2f
|
||||
subs r2, r2, r1
|
||||
beq 2f
|
||||
1:
|
||||
ldrb r3, [r0]
|
||||
adds r0, r0, #1
|
||||
strb r3, [r1]
|
||||
adds r1, r1, #1
|
||||
subs r2, r2, #1
|
||||
bne 1b
|
||||
2:
|
||||
bx lr
|
||||
|
||||
.thumb_func
|
||||
memory_set:
|
||||
cmp r0, r1
|
||||
beq 1f
|
||||
strb r2, [r0]
|
||||
adds r0, r0, #1
|
||||
b memory_set
|
||||
1:
|
||||
bx lr
|
||||
|
||||
// default C/C++ library helpers
|
||||
|
||||
.macro HELPER helper_name
|
||||
.section .text.\helper_name, "ax", %progbits
|
||||
.global \helper_name
|
||||
.weak \helper_name
|
||||
\helper_name:
|
||||
.thumb_func
|
||||
.endm
|
||||
|
||||
.macro JUMPTO name
|
||||
#if defined(__thumb__) && !defined(__thumb2__)
|
||||
mov r12, r0
|
||||
ldr r0, =\name
|
||||
push {r0}
|
||||
mov r0, r12
|
||||
pop {pc}
|
||||
#else
|
||||
b \name
|
||||
#endif
|
||||
.endm
|
||||
|
||||
HELPER __aeabi_read_tp
|
||||
ldr r0, =__tbss_start__-8
|
||||
bx lr
|
||||
HELPER __heap_lock
|
||||
bx lr
|
||||
HELPER __heap_unlock
|
||||
bx lr
|
||||
HELPER __printf_lock
|
||||
bx lr
|
||||
HELPER __printf_unlock
|
||||
bx lr
|
||||
HELPER __scanf_lock
|
||||
bx lr
|
||||
HELPER __scanf_unlock
|
||||
bx lr
|
||||
HELPER __debug_io_lock
|
||||
bx lr
|
||||
HELPER __debug_io_unlock
|
||||
bx lr
|
||||
HELPER abort
|
||||
b .
|
||||
HELPER __assert
|
||||
b .
|
||||
HELPER __aeabi_assert
|
||||
b .
|
||||
HELPER __cxa_pure_virtual
|
||||
b .
|
||||
HELPER __cxa_guard_acquire
|
||||
ldr r3, [r0]
|
||||
#if defined(__thumb__) && !defined(__thumb2__)
|
||||
movs r0, #1
|
||||
tst r3, r0
|
||||
#else
|
||||
tst r3, #1
|
||||
#endif
|
||||
beq 1f
|
||||
movs r0, #0
|
||||
bx lr
|
||||
1:
|
||||
movs r0, #1
|
||||
bx lr
|
||||
HELPER __cxa_guard_release
|
||||
movs r3, #1
|
||||
str r3, [r0]
|
||||
bx lr
|
||||
HELPER __cxa_guard_abort
|
||||
bx lr
|
||||
HELPER __sync_synchronize
|
||||
bx lr
|
||||
HELPER __getchar
|
||||
JUMPTO debug_getchar
|
||||
HELPER __putchar
|
||||
JUMPTO debug_putchar
|
||||
HELPER __open
|
||||
JUMPTO debug_fopen
|
||||
HELPER __close
|
||||
JUMPTO debug_fclose
|
||||
HELPER __write
|
||||
mov r3, r0
|
||||
mov r0, r1
|
||||
movs r1, #1
|
||||
JUMPTO debug_fwrite
|
||||
HELPER __read
|
||||
mov r3, r0
|
||||
mov r0, r1
|
||||
movs r1, #1
|
||||
JUMPTO debug_fread
|
||||
HELPER __seek
|
||||
push {r4, lr}
|
||||
mov r4, r0
|
||||
bl debug_fseek
|
||||
cmp r0, #0
|
||||
bne 1f
|
||||
mov r0, r4
|
||||
bl debug_ftell
|
||||
pop {r4, pc}
|
||||
1:
|
||||
ldr r0, =-1
|
||||
pop {r4, pc}
|
||||
// char __user_locale_name_buffer[];
|
||||
.section .bss.__user_locale_name_buffer, "aw", %nobits
|
||||
.global __user_locale_name_buffer
|
||||
.weak __user_locale_name_buffer
|
||||
__user_locale_name_buffer:
|
||||
.word 0x0
|
||||
|
||||
#ifdef FULL_LIBRARY
|
||||
.bss
|
||||
args:
|
||||
.space ARGSSPACE
|
||||
#endif
|
||||
|
||||
/* Setup attibutes of stack and heap sections so they don't take up room in the elf file */
|
||||
.section .stack, "wa", %nobits
|
||||
.section .stack_process, "wa", %nobits
|
||||
.section .heap, "wa", %nobits
|
||||
|
||||
Reference in New Issue
Block a user