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Add linking step

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This commit is contained in:
Alexander Heldt
2024-06-22 19:20:43 +02:00
parent 4c77450e47
commit 8c8a72df71
8 changed files with 5643 additions and 1 deletions
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5
Makefile
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@@ -28,7 +28,10 @@ ASM_FILES := $(patsubst $(BUILD_DIR)/%.i,$(BUILD_DIR)/%.S,$(PREP_FILES))
OBJ_FILES := $(patsubst $(BUILD_DIR)/%.S,$(BUILD_DIR)/%.o,$(ASM_FILES))
.PHONY: build
build: builddir preprocess compile assemble
build: builddir preprocess compile assemble $(BUILD_DIR)/final.elf
$(BUILD_DIR)/final.elf: $(OBJ_FILES)
$(CC) $(LDFLAGS) $^ -o $@
$(BUILD_DIR)/%.i: $(SRC_DIR)/%.c
$(CC) $(CFLAGS) -E $^ -o $@

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build/final.elf Executable file
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build/final.elf.map Normal file
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@@ -0,0 +1,156 @@
Discarded input sections
.text 0x00000000 0x0 build/main.o
.data 0x00000000 0x0 build/main.o
.bss 0x00000000 0x0 build/main.o
.group 0x00000000 0xc build/startup.o
.group 0x00000000 0xc build/startup.o
.group 0x00000000 0xc build/startup.o
.group 0x00000000 0xc build/startup.o
.group 0x00000000 0xc build/startup.o
.group 0x00000000 0xc build/startup.o
.text 0x00000000 0x0 build/startup.o
.data 0x00000000 0x0 build/startup.o
.bss 0x00000000 0x0 build/startup.o
Memory Configuration
Name Origin Length Attributes
flash 0x08000000 0x00080000 xr
sram 0x20000000 0x00020000 xrw
*default* 0x00000000 0xffffffff
Linker script and memory map
LOAD /nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/bin/../lib/gcc/arm-none-eabi/12.3.1/../../../../arm-none-eabi/lib/libc_nano.a
LOAD /nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/bin/../lib/gcc/arm-none-eabi/12.3.1/libgcc.a
LOAD build/main.o
LOAD build/startup.o
0x20020000 stack_start = (ORIGIN (sram) + LENGTH (sram))
.isr_vector 0x08000000 0x198
0x08000000 . = ALIGN (0x4)
*(.isr_vector)
.isr_vector 0x08000000 0x198 build/startup.o
0x08000000 interrupt_vector_table
0x08000198 . = ALIGN (0x4)
.text 0x08000198 0x84
0x08000198 . = ALIGN (0x4)
*(.text)
*(.text.*)
.text.main 0x08000198 0x10 build/main.o
0x08000198 main
.text.init_memory
0x080001a8 0x64 build/startup.o
0x080001a8 init_memory
.text.reset 0x0800020c 0x10 build/startup.o
0x0800020c reset
*(.rodata)
*(.rodata.*)
0x0800021c . = ALIGN (0x4)
0x0800021c _data_addr = LOADADDR (.data)
.glue_7 0x0800021c 0x0
.glue_7 0x0800021c 0x0 linker stubs
.glue_7t 0x0800021c 0x0
.glue_7t 0x0800021c 0x0 linker stubs
.vfp11_veneer 0x0800021c 0x0
.vfp11_veneer 0x0800021c 0x0 linker stubs
.v4_bx 0x0800021c 0x0
.v4_bx 0x0800021c 0x0 linker stubs
.iplt 0x0800021c 0x0
.iplt 0x0800021c 0x0 build/startup.o
.rel.dyn 0x0800021c 0x0
.rel.iplt 0x0800021c 0x0 build/startup.o
.data 0x20000000 0x0 load address 0x0800021c
0x20000000 . = ALIGN (0x4)
0x20000000 _data_start = .
*(.data)
*(.data.*)
0x20000000 . = ALIGN (0x4)
0x20000000 _data_end = .
.igot.plt 0x20000000 0x0 load address 0x0800021c
.igot.plt 0x20000000 0x0 build/startup.o
.bss 0x20000000 0x0 load address 0x0800021c
0x20000000 . = ALIGN (0x4)
0x20000000 _bss_start = .
*(.bss)
*(.bss.*)
0x20000000 _bss_end = .
0x20000000 . = ALIGN (0x4)
OUTPUT(build/final.elf elf32-littlearm)
LOAD linker stubs
.debug_info 0x00000000 0x1be
.debug_info 0x00000000 0x48 build/main.o
.debug_info 0x00000048 0x176 build/startup.o
.debug_abbrev 0x00000000 0x14a
.debug_abbrev 0x00000000 0x3c build/main.o
.debug_abbrev 0x0000003c 0x10e build/startup.o
.debug_aranges 0x00000000 0x48
.debug_aranges
0x00000000 0x20 build/main.o
.debug_aranges
0x00000020 0x28 build/startup.o
.debug_rnglists
0x00000000 0x2c
.debug_rnglists
0x00000000 0x13 build/main.o
.debug_rnglists
0x00000013 0x19 build/startup.o
.debug_macro 0x00000000 0x19f3
.debug_macro 0x00000000 0xaaa build/main.o
.debug_macro 0x00000aaa 0xafc build/startup.o
.debug_macro 0x000015a6 0x22 build/startup.o
.debug_macro 0x000015c8 0x8e build/startup.o
.debug_macro 0x00001656 0x51 build/startup.o
.debug_macro 0x000016a7 0x103 build/startup.o
.debug_macro 0x000017aa 0x6a build/startup.o
.debug_macro 0x00001814 0x1df build/startup.o
.debug_line 0x00000000 0x120
.debug_line 0x00000000 0x4f build/main.o
.debug_line 0x0000004f 0xd1 build/startup.o
.debug_str 0x00000000 0x3be8
.debug_str 0x00000000 0x2da8 build/main.o
.debug_str 0x00002da8 0xe40 build/startup.o
0x3d41 (size before relaxing)
.comment 0x00000000 0x45
.comment 0x00000000 0x45 build/main.o
0x46 (size before relaxing)
.comment 0x00000045 0x46 build/startup.o
.ARM.attributes
0x00000000 0x34
.ARM.attributes
0x00000000 0x34 build/main.o
.ARM.attributes
0x00000034 0x34 build/startup.o
.debug_line_str
0x00000000 0x210
.debug_line_str
0x00000000 0x35 build/main.o
.debug_line_str
0x00000035 0x1db build/startup.o
0x21b (size before relaxing)
.debug_frame 0x00000000 0x84
.debug_frame 0x00000000 0x30 build/main.o
.debug_frame 0x00000030 0x54 build/startup.o

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build/startup.i Normal file
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43
link.ld Normal file
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@@ -0,0 +1,43 @@
ENTRY(reset);
MEMORY {
flash(rx) : ORIGIN = 0x08000000, LENGTH = 512K
sram(rwx) : ORIGIN = 0x20000000, LENGTH = 128K
}
stack_start = ORIGIN(sram) + LENGTH(sram); /* stack points to end of sram */
SECTIONS {
.isr_vector : {
. = ALIGN(4);
KEEP(*(.isr_vector))
. = ALIGN(4);
} > flash
.text : { /* code and constants */
. = ALIGN(4);
*(.text)
*(.text.*)
*(.rodata)
*(.rodata.*)
. = ALIGN(4);
} > flash
_data_addr = LOADADDR(.data);
.data : { /* intialized variables */
. = ALIGN(4);
_data_start = .;
*(.data)
*(.data.*)
. = ALIGN(4);
_data_end = .;
} > sram AT > flash /* loads the section into sram, with initial values stored in flash */
.bss : { /* unintialized variables */
. = ALIGN(4);
_bss_start = .;
*(.bss)
*(.bss.*)
_bss_end = .;
. = ALIGN(4);
} > sram
}

34
src/startup.c Normal file
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@@ -0,0 +1,34 @@
#include <stdint.h>
extern void stack_start(void); // Defined in link.ld
extern int main(void);
void init_memory(void) {
// Copy .data SECTION to ram
extern uint32_t _data_start, _data_end, _data_addr;
for (uint32_t *dst = &_data_start, *src = &_data_addr; dst < &_data_end;) {
*dst++ = *src++;
}
// Initialize .bss SECTION with zeros
extern uint32_t _bss_start, _bss_end;
for (uint32_t *dst = &_bss_start; dst < &_bss_end; dst++) {
*dst = 0;
}
}
void reset(void) {
(void)init_memory();
main();
// Infinite loop in case main returns
for (;;) (void) 0;
}
// Create minimal interrupt vector table
// 16 standard and 86 STM32F411xC/E-specific handlers
void (*const interrupt_vector_table[16 + 86])(void) __attribute__((section(".isr_vector"))) = {
stack_start, // Defined in link.ld
reset
};