ARM GAS /tmp/ccAyRUei.s page 1 1 .cpu cortex-m7 2 .eabi_attribute 28, 1 3 .eabi_attribute 20, 1 4 .eabi_attribute 21, 1 5 .eabi_attribute 23, 3 6 .eabi_attribute 24, 1 7 .eabi_attribute 25, 1 8 .eabi_attribute 26, 1 9 .eabi_attribute 30, 1 10 .eabi_attribute 34, 1 11 .eabi_attribute 18, 4 12 .file "sysmem.c" 13 .text 14 .Ltext0: 15 .cfi_sections .debug_frame 16 .section .text._sbrk,"ax",%progbits 17 .align 1 18 .global _sbrk 19 .arch armv7e-m 20 .syntax unified 21 .thumb 22 .thumb_func 23 .fpu fpv5-d16 25 _sbrk: 26 .LVL0: 27 .LFB0: 28 .file 1 "Src/sysmem.c" 1:Src/sysmem.c **** /** 2:Src/sysmem.c **** ****************************************************************************** 3:Src/sysmem.c **** * @file sysmem.c 4:Src/sysmem.c **** * @author Generated by STM32CubeMX 5:Src/sysmem.c **** * @brief System Memory calls file 6:Src/sysmem.c **** * 7:Src/sysmem.c **** * For more information about which C functions 8:Src/sysmem.c **** * need which of these lowlevel functions 9:Src/sysmem.c **** * please consult the newlib libc manual 10:Src/sysmem.c **** ****************************************************************************** 11:Src/sysmem.c **** * @attention 12:Src/sysmem.c **** * 13:Src/sysmem.c **** * Copyright (c) 2024 STMicroelectronics. 14:Src/sysmem.c **** * All rights reserved. 15:Src/sysmem.c **** * 16:Src/sysmem.c **** * This software is licensed under terms that can be found in the LICENSE file 17:Src/sysmem.c **** * in the root directory of this software component. 18:Src/sysmem.c **** * If no LICENSE file comes with this software, it is provided AS-IS. 19:Src/sysmem.c **** * 20:Src/sysmem.c **** ****************************************************************************** 21:Src/sysmem.c **** */ 22:Src/sysmem.c **** 23:Src/sysmem.c **** /* Includes */ 24:Src/sysmem.c **** #include 25:Src/sysmem.c **** #include 26:Src/sysmem.c **** 27:Src/sysmem.c **** /** 28:Src/sysmem.c **** * Pointer to the current high watermark of the heap usage 29:Src/sysmem.c **** */ 30:Src/sysmem.c **** static uint8_t *__sbrk_heap_end = NULL; ARM GAS /tmp/ccAyRUei.s page 2 31:Src/sysmem.c **** 32:Src/sysmem.c **** /** 33:Src/sysmem.c **** * @brief _sbrk() allocates memory to the newlib heap and is used by malloc 34:Src/sysmem.c **** * and others from the C library 35:Src/sysmem.c **** * 36:Src/sysmem.c **** * @verbatim 37:Src/sysmem.c **** * ############################################################################ 38:Src/sysmem.c **** * # .data # .bss # newlib heap # MSP stack # 39:Src/sysmem.c **** * # # # # Reserved by _Min_Stack_Size # 40:Src/sysmem.c **** * ############################################################################ 41:Src/sysmem.c **** * ^-- RAM start ^-- _end _estack, RAM end --^ 42:Src/sysmem.c **** * @endverbatim 43:Src/sysmem.c **** * 44:Src/sysmem.c **** * This implementation starts allocating at the '_end' linker symbol 45:Src/sysmem.c **** * The '_Min_Stack_Size' linker symbol reserves a memory for the MSP stack 46:Src/sysmem.c **** * The implementation considers '_estack' linker symbol to be RAM end 47:Src/sysmem.c **** * NOTE: If the MSP stack, at any point during execution, grows larger than the 48:Src/sysmem.c **** * reserved size, please increase the '_Min_Stack_Size'. 49:Src/sysmem.c **** * 50:Src/sysmem.c **** * @param incr Memory size 51:Src/sysmem.c **** * @return Pointer to allocated memory 52:Src/sysmem.c **** */ 53:Src/sysmem.c **** void *_sbrk(ptrdiff_t incr) 54:Src/sysmem.c **** { 29 .loc 1 54 1 view -0 30 .cfi_startproc 31 @ args = 0, pretend = 0, frame = 0 32 @ frame_needed = 0, uses_anonymous_args = 0 33 .loc 1 54 1 is_stmt 0 view .LVU1 34 0000 10B5 push {r4, lr} 35 .LCFI0: 36 .cfi_def_cfa_offset 8 37 .cfi_offset 4, -8 38 .cfi_offset 14, -4 39 0002 0346 mov r3, r0 55:Src/sysmem.c **** extern uint8_t _end; /* Symbol defined in the linker script */ 40 .loc 1 55 3 is_stmt 1 view .LVU2 56:Src/sysmem.c **** extern uint8_t _estack; /* Symbol defined in the linker script */ 41 .loc 1 56 3 view .LVU3 57:Src/sysmem.c **** extern uint32_t _Min_Stack_Size; /* Symbol defined in the linker script */ 42 .loc 1 57 3 view .LVU4 58:Src/sysmem.c **** const uint32_t stack_limit = (uint32_t)&_estack - (uint32_t)&_Min_Stack_Size; 43 .loc 1 58 3 view .LVU5 44 .loc 1 58 18 is_stmt 0 view .LVU6 45 0004 0C4A ldr r2, .L8 46 0006 0D49 ldr r1, .L8+4 59:Src/sysmem.c **** const uint8_t *max_heap = (uint8_t *)stack_limit; 47 .loc 1 59 3 is_stmt 1 view .LVU7 48 .LVL1: 60:Src/sysmem.c **** uint8_t *prev_heap_end; 49 .loc 1 60 3 view .LVU8 61:Src/sysmem.c **** 62:Src/sysmem.c **** /* Initialize heap end at first call */ 63:Src/sysmem.c **** if (NULL == __sbrk_heap_end) 50 .loc 1 63 3 view .LVU9 51 .loc 1 63 12 is_stmt 0 view .LVU10 52 0008 0D48 ldr r0, .L8+8 ARM GAS /tmp/ccAyRUei.s page 3 53 .LVL2: 54 .loc 1 63 12 view .LVU11 55 000a 0068 ldr r0, [r0] 56 .loc 1 63 6 view .LVU12 57 000c 40B1 cbz r0, .L6 58 .L2: 64:Src/sysmem.c **** { 65:Src/sysmem.c **** __sbrk_heap_end = &_end; 66:Src/sysmem.c **** } 67:Src/sysmem.c **** 68:Src/sysmem.c **** /* Protect heap from growing into the reserved MSP stack */ 69:Src/sysmem.c **** if (__sbrk_heap_end + incr > max_heap) 59 .loc 1 69 3 is_stmt 1 view .LVU13 60 .loc 1 69 23 is_stmt 0 view .LVU14 61 000e 0C48 ldr r0, .L8+8 62 0010 0068 ldr r0, [r0] 63 0012 0344 add r3, r3, r0 64 .LVL3: 65 .loc 1 69 6 view .LVU15 66 0014 521A subs r2, r2, r1 67 0016 9342 cmp r3, r2 68 0018 06D8 bhi .L7 70:Src/sysmem.c **** { 71:Src/sysmem.c **** errno = ENOMEM; 72:Src/sysmem.c **** return (void *)-1; 73:Src/sysmem.c **** } 74:Src/sysmem.c **** 75:Src/sysmem.c **** prev_heap_end = __sbrk_heap_end; 69 .loc 1 75 3 is_stmt 1 view .LVU16 70 .LVL4: 76:Src/sysmem.c **** __sbrk_heap_end += incr; 71 .loc 1 76 3 view .LVU17 72 .loc 1 76 19 is_stmt 0 view .LVU18 73 001a 094A ldr r2, .L8+8 74 001c 1360 str r3, [r2] 77:Src/sysmem.c **** 78:Src/sysmem.c **** return (void *)prev_heap_end; 75 .loc 1 78 3 is_stmt 1 view .LVU19 76 .LVL5: 77 .L1: 79:Src/sysmem.c **** } 78 .loc 1 79 1 is_stmt 0 view .LVU20 79 001e 10BD pop {r4, pc} 80 .LVL6: 81 .L6: 65:Src/sysmem.c **** } 82 .loc 1 65 5 is_stmt 1 view .LVU21 65:Src/sysmem.c **** } 83 .loc 1 65 21 is_stmt 0 view .LVU22 84 0020 0748 ldr r0, .L8+8 85 0022 084C ldr r4, .L8+12 86 0024 0460 str r4, [r0] 87 0026 F2E7 b .L2 88 .LVL7: 89 .L7: 71:Src/sysmem.c **** return (void *)-1; 90 .loc 1 71 5 is_stmt 1 view .LVU23 ARM GAS /tmp/ccAyRUei.s page 4 91 0028 FFF7FEFF bl __errno 92 .LVL8: 71:Src/sysmem.c **** return (void *)-1; 93 .loc 1 71 11 is_stmt 0 view .LVU24 94 002c 0C23 movs r3, #12 95 002e 0360 str r3, [r0] 72:Src/sysmem.c **** } 96 .loc 1 72 5 is_stmt 1 view .LVU25 72:Src/sysmem.c **** } 97 .loc 1 72 12 is_stmt 0 view .LVU26 98 0030 4FF0FF30 mov r0, #-1 99 0034 F3E7 b .L1 100 .L9: 101 0036 00BF .align 2 102 .L8: 103 0038 00000000 .word _estack 104 003c 00000000 .word _Min_Stack_Size 105 0040 00000000 .word .LANCHOR0 106 0044 00000000 .word _end 107 .cfi_endproc 108 .LFE0: 110 .section .bss.__sbrk_heap_end,"aw",%nobits 111 .align 2 112 .set .LANCHOR0,. + 0 115 __sbrk_heap_end: 116 0000 00000000 .space 4 117 .text 118 .Letext0: 119 .file 2 "/usr/lib/gcc/arm-none-eabi/10.3.1/include/stddef.h" 120 .file 3 "/usr/lib/gcc/arm-none-eabi/10.3.1/include/stdint.h" 121 .file 4 "/usr/include/newlib/sys/errno.h" ARM GAS /tmp/ccAyRUei.s page 5 DEFINED SYMBOLS *ABS*:0000000000000000 sysmem.c /tmp/ccAyRUei.s:17 .text._sbrk:0000000000000000 $t /tmp/ccAyRUei.s:25 .text._sbrk:0000000000000000 _sbrk /tmp/ccAyRUei.s:103 .text._sbrk:0000000000000038 $d /tmp/ccAyRUei.s:111 .bss.__sbrk_heap_end:0000000000000000 $d /tmp/ccAyRUei.s:115 .bss.__sbrk_heap_end:0000000000000000 __sbrk_heap_end UNDEFINED SYMBOLS __errno _estack _Min_Stack_Size _end