see below: the program encounter an undefined instruction error when execute the blx instruction.
[0xb510] push {r4,r14} [0xb09c] sub r13,#0x70 [0xa803] add r0,r13,#0xc [0x2264] mov r2,#0x64 [0x4911] ldr r1,0x0000d4c8 ; = #0x0000d4e8 [0xe8e8f000] blx 0xd658 ; (Image$$ZI$$Limit + 0x8b4) [0x4c10] ldr r4,0x0000d4cc ; = #0x0000d54c [0x2002] mov r0,#2 [0x6861] ldr r1,[r4,#4] [0xeff0f7ff] blx 0xd470 ; (Image$$ZI$$Limit + 0x6cc) [0x1c02] mov r2,r0
I checked the format of blx instruction, it seems the instruction is valid. I have no idea why it throws the " undefined instruction".