(gdb) mon swdp_scan
Target voltage: Not Detected
Available Targets:
No. Att Driver
 1      EFM32 Happy Gecko
(gdb) att 1
Attaching to Remote target
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
0x00002a4e in ?? ()
(gdb) info all
r0             0x3	3
r1             0x40006120	1073766688
r2             0x74b7	29879
r3             0x2000091c	536873244
r4             0x2000091c	536873244
r5             0x0	0
r6             0x20000c0c	536873996
r7             0x7530	30000
r8             0x10000000	268435456
r9             0x1000044	16777284
r10            0x0	0
r11            0x0	0
r12            0x20000805	536872965
sp             0x200008f8	0x200008f8
lr             0xfffffff9	0xfffffff9
pc             0x2a4e	0x2a4e
xpsr           0x1000011	16777233
msp            0x200008f8	0x200008f8
psp            0x0	0x0
special        0x1	1