[fpc-devel] Building cross-compiler for arm-linux on win32

[Nikolai Zhubr]

16.12.2018 18:13, Jonas Maebe:
> Which instructions does it show if you run the program in gdb and do
> "x/2i $pc-4" when it crashes?

I made some additional steps in gdb in order to check if the program in 
question actually starts executing anything at all. Looks like it does:

GNU gdb (GDB; openSUSE Leap 42.3) 8.0
.....
Reading symbols from t-bad...(no debugging symbols found)...done.
(gdb) info files
Symbols from "/root/personal/t-bad".
Local exec file:
         `/root/personal/t-bad', file type elf32-littlearm.
         Entry point: 0x100ec
         0x000100c0 - 0x000100e0 is .note.ABI-tag
         0x000100e0 - 0x0003dff4 is .text
         0x0003dff8 - 0x00042cf8 is .rodata
         0x00053000 - 0x00053c5e is .data
         0x00053c60 - 0x00055c18 is .bss
(gdb) break *0x100ec
Breakpoint 1 at 0x100ec
(gdb) run
Starting program: /root/personal/t-bad

Breakpoint 1, 0x000100ec in ?? ()
(gdb) x/2i $pc
=> 0x100ec:     mov     r11, #0
    0x100f0:     ldmfd   sp!, {r1}
(gdb) stepi
0x000100f0 in ?? ()
(gdb) stepi
0x000100f4 in ?? ()
(gdb) x/2i $pc-4
    0x100f0:     ldmfd   sp!, {r1}
=> 0x100f4:     ldr     r12, [pc, #92]  ; 0x10158
(gdb) cont
Continuing.

Program received signal SIGILL, Illegal instruction.
0x0003155a in ?? ()
(gdb) x/2i $pc-4
    0x31556:
     stmdb       sp!, {r0, r1, r2, r3, r4, r6, r7, r8, r9, r10, r11, 
r12, pc}
=> 0x3155a:                     ; <UNDEFINED> instruction: 0xfaff0060
(gdb)


Thank you!

Regards,
Nikolai

>
> Jonas
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