I have a C program for the attiny85, that I want to disassemble and display with interleaved source code.
Here's my program: test.c
#include <avr/io.h>
int main() {
for(int i=0; i<100; i++) {
PORTB=i;
}
}
Here's how I compile it: avr-gcc -g -O0 -mmcu=attiny85 -o test.elf test.c
Finally, I generate the disassembly with interleaved source-code with the command: avr-objdump -S -D test.elf
The disassembly of the text section shows the following disassembly without interleaved source code:
00000030 <main>:
30: cf 93 push r28
32: df 93 push r29
34: 00 d0 rcall .+0 ; 0x36 <main+0x6>
36: cd b7 in r28, 0x3d ; 61
38: de b7 in r29, 0x3e ; 62
3a: 1a 82 std Y+2, r1 ; 0x02
3c: 19 82 std Y+1, r1 ; 0x01
3e: 0a c0 rjmp .+20 ; 0x54 <__SREG__+0x15>
40: 88 e3 ldi r24, 0x38 ; 56
42: 90 e0 ldi r25, 0x00 ; 0
44: 29 81 ldd r18, Y+1 ; 0x01
46: fc 01 movw r30, r24
48: 20 83 st Z, r18
4a: 89 81 ldd r24, Y+1 ; 0x01
4c: 9a 81 ldd r25, Y+2 ; 0x02
4e: 01 96 adiw r24, 0x01 ; 1
50: 9a 83 std Y+2, r25 ; 0x02
52: 89 83 std Y+1, r24 ; 0x01
54: 89 81 ldd r24, Y+1 ; 0x01
56: 9a 81 ldd r25, Y+2 ; 0x02
58: 84 36 cpi r24, 0x64 ; 100
5a: 91 05 cpc r25, r1
5c: 8c f3 brlt .-30 ; 0x40 <__SREG__+0x1>
5e: 80 e0 ldi r24, 0x00 ; 0
60: 90 e0 ldi r25, 0x00 ; 0
62: 0f 90 pop r0
64: 0f 90 pop r0
66: df 91 pop r29
68: cf 91 pop r28
6a: 08 95 ret
The disassembly makes somewhat sense, only that I miss the interleaved source code.
Interestingly enough, the output also includes a stab section, where I also find the main segment disassembled:
#include <avr/io.h>
int main() {
30: 20 00 .word 0x0020 ; ????
32: 00 00 nop
34: 80 00 .word 0x0080 ; ????
36: 00 00 nop
38: 00 00 nop
for(int i=0; i<100; i++) {
3a: 00 00 nop
3c: 40 00 .word 0x0040 ; ????
3e: 00 00 nop
PORTB=i;
40: 80 00 .word 0x0080 ; ????
42: 00 00 nop
44: 00 00 nop
46: 00 00 nop
48: 5a 00 .word 0x005a ; ????
for(int i=0; i<100; i++) {
4a: 00 00 nop
4c: 80 00 .word 0x0080 ; ????
4e: 00 00 nop
50: 00 00 nop
52: 00 00 nop
54: 91 00 .word 0x0091 ; ????
56: 00 00 nop
58: 80 00 .word 0x0080 ; ????
5a: 00 00 nop
5c: 00 00 nop
5e: 00 00 nop
60: b7 00 .word 0x00b7 ; ????
}
}
Now the output includes source code, but the disassembly is wrong.
How do I get an output were both is correct: the disassembled instructions and the interleaved source-code?
(avr-gcc (GCC) 9.3.0. Interleave Assembly and Source for avr-objdump does not seem to have the problem, although he's using the same compiler flags...)
