error.txt

[19:02:19] call_internal.c:36> syscall failure! 0x20017d28..0x20017d38 is not in app space.

gdb.txt

(gdb) disassemble $pc,+4
Dump of assembler code from 0x2001b5b0 to 0x2001b5b4:
=> 0x2001b5b0:	bl	0x2001c19c                                ### this is app_log
End of assembler dump.
(gdb) info registers
r0             0x1	1
r1             0x2001c22d	536986157
r2             0x1	1
r3             0x2001c231	536986161
r4             0x1	1
r5             0x1	1
r6             0x20017dd8	536968664
r7             0xa5a5a5a5	-1515870811
r8             0xa5a5a5a5	-1515870811
r9             0xa5a5a5a5	-1515870811
r10            0xa5a5a5a5	-1515870811
r11            0xa5a5a5a5	-1515870811
r12            0x8046b99	134507417
sp             0x20017dc0	0x20017dc0
lr             0x2001b4c5	536982725
pc             0x2001b5b0	0x2001b5b0
cpsr           0x20000173	536871283
(gdb) p (char*)$r1
$3 = 0x2001c22d "why"
(gdb) p (char*)$r3
$4 = 0x2001c231 "wh %s yyyyy"
(gdb) p *(char**)$sp
$8 = 0x2001c23d "different"
(gdb) p (char**)$sp
$9 = (char **) 0x20017dc0

line.rs

external::app_log(1, b"why\0".as_ptr(), 1, b"wh %s yyyyy\0".as_ptr(), b"different\0".as_ptr());