Hi, folks:
A CS7500 board was booted by Linux ARM kernel successfully. I put my cross compiled
application into mounted NFS folder. I've tried some other applications. Everything
seems Ok. But to my application, it's reported that there is an illegal instruction at
PC=XXXXXXXX. I disassembled the binary and addressed error line. This error exists in
a pthread function, I think. Following is the snippet:
022869b4 <__pthread_compare_and_swap>:
22869b4: e1a0c00d mov r12, sp
22869b8: e92dd8f0 stmdb sp!, {r4, r5, r6, r7, r11, r12, lr, pc}
22869bc: e24cb004 sub r11, r12, #4 ; 0x4
22869c0: e1a05000 mov r5, r0
22869c4: e1a06001 mov r6, r1
22869c8: e1a07002 mov r7, r2
22869cc: e1a04003 mov r4, r3
22869d0: e3a03001 mov r3, #1 ; 0x1
22869d4: e1043093 swp r3, r3, [r4] ;=======================>>>>>>>
ERROR LINE: illegal instruction
22869d8: e3530000 cmp r3, #0 ; 0x0
22869dc: 0a000001 beq 22869e8 <__pthread_compare_and_swap+0x34>
22869e0: e1a00004 mov r0, r4
22869e4: eb000007 bl 2286a08 <__pthread_acquire>
22869e8: e5953000 ldr r3, [r5]
22869ec: e1530006 cmp r3, r6
22869f0: 05857000 streq r7, [r5]
22869f4: 03a00001 moveq r0, #1 ; 0x1
22869f8: 13a00000 movne r0, #0 ; 0x0
22869fc: e3a03000 mov r3, #0 ; 0x0
2286a00: e5843000 str r3, [r4]
2286a04: e91ba8f0 ldmdb r11, {r4, r5, r6, r7, r11, sp, pc}
According to ARM instruction set, this 'swp r3, r3, [r4]' instruction is proper. So I
wonder what originates 'illegal instruction'.
Thanks in advance,
Yu Xuanwei
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