Debugging c code tips?

I still have to actually understand more about this. But the registers look wrong from the start?

Start address 0x1f7bc, load size 281236
Transfer rate: 20 KB/sec, 13392 bytes/write.
(gdb) ls
Undefined command: "ls".  Try "help".
(gdb) info registers
r0             0x0                 0
r1             0x0                 0
r2             0x0                 0
r3             0x0                 0
r4             0x0                 0
r5             0x0                 0
r6             0x0                 0
r7             0x0                 0
r8             0x0                 0
r9             0x0                 0
r10            0x0                 0
r11            0x0                 0
r12            0x0                 0
sp             0xffffffd8          0xffffffd8
lr             0xfffffff9          -7
pc             0x1f7bc             0x1f7bc <Reset_Handler>
xPSR           0x1000003           16777219
fpscr          0x0                 0
msp            0xfffffffc          0xfffffffc
psp            0x0                 0x0
primask        0x0                 0
basepri        0x0                 0
faultmask      0x0                 0
control        0x0                 0