openrisc c from c++ SIGBUS issue, FULL

caller:
	130c:       8c 62 ff eb     l.lbz r3,0xffffffeb(r2)
    1310:       a4 63 00 00     l.andi r3,r3,0x0
    1314:       db e2 1f eb     l.sb 0xffffffeb(r2),r3
    1318:       8c 62 ff ec     l.lbz r3,0xffffffec(r2)
    131c:       a4 63 00 00     l.andi r3,r3,0x0
    1320:       9c 80 ff 89     l.addi r4,r0,0xffffff89
    1324:       e0 63 20 04     l.or r3,r3,r4
    1328:       db e2 1f ec     l.sb 0xffffffec(r2),r3

                i2c_trans(&mode, &type); // perform write
    132c:       9c 62 ff ed     l.addi r3,r2,0xffffffed
    1330:       9c 82 ff e9     l.addi r4,r2,0xffffffe9
    1334:       04 00 10 4c     l.jal 5464 <i2c_trans>
    1338:       15 00 00 00     l.nop 0x0
    133c:       00 00 00 03     l.j 1348 <_Z9doI2CReadj+0x8c>
    1340:       15 00 00 00     l.nop 0x0

callee:
	int i2c_trans(i2c_mode * mode, i2c_type * pData)
	{
	    5464:       d7 e1 17 f8     l.sw 0xfffffff8(r1),r2
	    5468:       9c 41 00 00     l.addi r2,r1,0x0
	    546c:       d7 e1 4f fc     l.sw 0xfffffffc(r1),r9
	    5470:       9c 21 ff ec     l.addi r1,r1,0xffffffec
	    5474:       d7 e2 1f f0     l.sw 0xfffffff0(r2),r3
	    5478:       d7 e2 27 ec     l.sw 0xffffffec(r2),r4

	    [... some lines that work fine ...]

	SIGBUS occurs here (5750):
    	dat_list[i] = pData->data;   //read/write low byte
    574c:       84 62 ff ec     l.lwz r3,0xffffffec(r2)
    5750:       94 63 00 02     l.lhz r3,0x2(r3)