Analyze GNU ld’s linker map, based on visual version .
Works best with -ffunction-sections -fdata-sections and statically linked code (e.g. for bare-metal embedded systems).
Note: -flto merges code across .o files and make it difficult to analyze.
$ pip install .
$ linkermap --help
Usage: linkermap [OPTIONS] MAP_FILE
Options:
-v, --verbose Print symbols within file
--help Show this message and exit.non-verbose
$ linkermap cdc_msc.elf.map
File | .text .data .bss Total
------------------------------------------------------------------------------------
msc_disk.o | 8192 1 313 8506
usbd.o | 24 257 2820 3101
dcd_nrf5x.o | 0 220 2678 2898
msc_device.o | 0 576 2050 2626
libc.a | 1072 33 696 1801
cdc_device.o | 0 312 1044 1356
tusb_fifo.o | 0 0 1142 1142
nrfx_uarte.o | 0 36 800 836
usbd_control.o | 0 84 516 600
gcc_startup_nrf52840_asm.o | 0 0 572 572
system_nrf52840.o | 4 0 568 572
usb_descriptors.o | 24 64 276 364
nrfx_power.o | 0 13 330 343
family.o | 8 4 274 286
main.o | 4 5 188 197
tusb.o | 0 0 176 176
crt0.o | 0 0 124 124
crtbegin.o | 8 25 64 97
libc_nano.a | 0 0 96 96
crtn.o | 0 0 16 16
crti.o | 0 0 8 8
crtend.o | 0 0 4 4
libnosys.a | 0 0 4 4
SUM | 25725 9336 1630 14759
verbose
$ linkermap -v cdc_msc.elf.map
File | .text .data .bss Total
------------------------------------------------------------------------------------
usbd_control.o | 0 84 516 600
-------------- |--------------------------------
usbd_control_xfer_cb | 0 0 208 208
tud_control_xfer | 0 0 112 112
.text._data_stage_xact | 0 0 92 92
.bss._usbd_ctrl_buf | 0 64 0 64
tud_control_status | 0 0 48 48
usbd_control_set_request | 0 0 28 28
.bss._ctrl_xfer | 0 20 0 20
usbd_control_reset | 0 0 16 16
usbd_control_set_complete_callback | 0 0 12 12
------------------------------------------------------------------------------------
gcc_startup_nrf52840_asm.o | 0 0 572 572
-------------------------- |--------------------------------
__isr_vector | 0 0 512 512
Reset_Handler | 0 0 60 60
------------------------------------------------------------------------------------
system_nrf52840.o | 4 0 568 572
----------------- |--------------------------------
SystemInit | 0 0 464 464
.text.nrf52_errata_36 | 0 0 60 60
.text.nrf52_errata_98 | 0 0 40 40
SystemCoreClock | 4 0 0 4
.rodata.CSWTCH.6 | 0 0 4 4
------------------------------------------------------------------------------------
usb_descriptors.o | 24 64 276 364
----------------- |--------------------------------
desc_fs_configuration | 0 0 98 98
tud_descriptor_string_cb | 0 0 88 88
.bss._desc_str | 0 64 0 64
.rodata.str1.1 | 0 0 54 54
string_desc_arr | 24 0 0 24
desc_device | 0 0 18 18
tud_descriptor_device_cb | 0 0 8 8
tud_descriptor_configuration_cb | 0 0 8 8
.rodata.__compound_literal.0 | 0 0 2 2
------------------------------------------------------------------------------------