[U-Boot] using objdump/readelf/nm to dump symbols by individual source file?

[Chris Packham]

On Mon, Apr 8, 2019 at 4:29 AM Robert P. J. Day <rpjday at crashcourse.ca> wrote:
>
>
>   i'm doing this in the context of building for ARM with a linaro
> toolchain, but i'm sure it's equally valid in the context of a native
> build.
>
>   i'm trying to generate the same output as u-boot.map, but more
> condensed and with each symbol associated with its original source
> file (if that's even possible).
>
>   for example, there are a couple weak symbols in board_f.c:
>
>   __weak int arch_cpu_init(void)
>   {
>         return 0;
>   }
>
>   __weak int mach_cpu_init(void)
>   {
>         return 0;
>   }
>
> so depending on the target board, the final included version of such a
> routine might come from board_f.c, or it might be overridden at the
> board level.
>
>   you can sort of see this in u-boot.map:
>
>  .text.arch_cpu_init
>                 0x0000000000000000        0x8 common/built-in.o
>
>  ...
>  .text.mach_cpu_init
>                 0x0000000004011cac        0x8 common/built-in.o
>                 0x0000000004011cac                mach_cpu_init
>
> except i was hoping to be able to list included symbols by their
> *original* source file, and listed one file at a time, so the output
> would have the format:
>
>   board_f.o
>     mach_cpu_init
>     ... other stuff from board_f.o
>
> i could swear i once knew how to do this, but i've forgotten (or
> perhaps i'm misremembering). is there some variation of objdump,
> readelf or nm that will do what i want? i need nothing other than, for
> each source file, the symbols that were included in the final ELF file
> from that source file.
>
>   can i do this?
>

nm -l u-boot seems to give me what you're asking for


$ nm -l u-boot
0089b8d8 b a_b  /home/chrisp/src/u-boot/cmd/load.c:573
0089f62c b act.10860
00857780 t add_ino      /home/chrisp/src/u-boot/fs/ubifs/recovery.c:1261
00828b34 T add_mtd_device
/home/chrisp/src/u-boot/drivers/mtd/mtdcore.c:410
00829f7c T add_mtd_partitions
/home/chrisp/src/u-boot/drivers/mtd/mtdpart.c:865
00835b2c t add_to_list
0085188c t adjust_lpt_heap.isra.1
/home/chrisp/src/u-boot/fs/ubifs/lprops.c:635
0086b110 T adler32
008775e0 T __aeabi_idiv /home/chrisp/src/u-boot/arch/arm/lib/lib1funcs.S:251
008776c4 T __aeabi_idivmod
/home/chrisp/src/u-boot/arch/arm/lib/lib1funcs.S:340
00877544 T __aeabi_uidiv
/home/chrisp/src/u-boot/arch/arm/lib/lib1funcs.S:199
008776ac T __aeabi_uidivmod
/home/chrisp/src/u-boot/arch/arm/lib/lib1funcs.S:324
008776ec T __aeabi_uldivmod
/home/chrisp/src/u-boot/arch/arm/lib/uldivmod.S:38
00820fd4 t alloc_priv
0081ac20 t alloc_simple /home/chrisp/src/u-boot/common/malloc_simple.c:17