How can I get arm-none-eabi-objcopy to copy/translate my .axf file into a .bin suitable for flashing to the device with lm4tools?
I have a ~20KB .axf file compiled and linked with arm-none-eabi-*. For anyone interested, this is with the Stellaris Launchpad.
I'm trying to modify the example provided with the stellaris-launchpad-template-gcc project to compile with C++ code. I've managed to get it to produce a .axf file in elf32-littlearm format (according to the .lst file), however when I try to do
arm-none-eabi-objcopy -v -O binary main.axf foo.bin
to translate it into a programmable file, the .bin file output has a size of 0 bytes. This question describes a similar problem. I'm confident the .axf file is complete, so why isn't my .bin file being populated with anything? If I remove -O binary, the file is copied fine. The directory is writeable and all permissions are fine. I've tried searching both on SO and the rest of the internet with various terms, all of which turned up nothing of use. It seems nobody's had this problem before.
Running arm-none-eabi-objdump -D main.axf yields a dump of the file in what appears to be assembler:
main.axf: file format elf32-littlearm
Disassembly of section .debug_info:
00000000 <_end_text>:
0: 00000082 andeq r0, r0, r2, lsl #1
4: 00000002 andeq r0, r0, r2
8: 01040000 mrseq r0, (UNDEF: 4)
c: 00000057 andeq r0, r0, r7, asr r0
10: 00000c04 andeq r0, r0, r4, lsl #24
14: 00002300 andeq r2, r0, r0, lsl #6
...
28: 08010200 stmdaeq r1, {r9}
2c: 00000015 andeq r0, r0, r5, lsl r0
30: 00410103 subeq r0, r1, r3, lsl #2
34: 32010000 andcc r0, r1, #0
38: 00000048 andeq r0, r0, r8, asr #32
...
48: 69050404 stmdbvs r5, {r2, sl}
4c: 0500746e streq r7, [r0, #-1134] ; 0x46e
50: 00000001 andeq r0, r0, r1
54: 46430100 strbmi r0, [r3], -r0, lsl #2
...
Is this correct, or am I not even compiling properly, seeing as this appears to be some kind of assembler?
Some info about the .axf file:
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x0
Start of program headers: 52 (bytes into file)
Start of section headers: 20372 (bytes into file)
Flags: 0x5000000, Version5 EABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 0
Size of section headers: 40 (bytes)
Number of section headers: 14
Section header string table index: 11
After running arm-none-eabi-readelf -lS main.axf, no program headers are returned:
There are 14 section headers, starting at offset 0x4f94:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .debug_info PROGBITS 00000000 000034 0019a6 00 0 0 1
[ 2] .debug_abbrev PROGBITS 00000000 0019da 0005ad 00 0 0 1
[ 3] .debug_loc PROGBITS 00000000 001f87 001796 00 0 0 1
[ 4] .debug_aranges PROGBITS 00000000 003720 000088 00 0 0 8
[ 5] .debug_ranges PROGBITS 00000000 0037a8 000130 00 0 0 1
[ 6] .debug_line PROGBITS 00000000 0038d8 00077d 00 0 0 1
[ 7] .debug_str PROGBITS 00000000 004055 000aa8 01 MS 0 0 1
[ 8] .comment PROGBITS 00000000 004afd 00003a 01 MS 0 0 1
[ 9] .ARM.attributes ARM_ATTRIBUTES 00000000 004b37 000039 00 0 0 1
[10] .debug_frame PROGBITS 00000000 004b70 000388 00 0 0 4
[11] .shstrtab STRTAB 00000000 004ef8 00009a 00 0 0 1
[12] .symtab SYMTAB 00000000 0051c4 000200 10 13 18 4
[13] .strtab STRTAB 00000000 0053c4 0000e0 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
There are no program headers in this file.
