Tools: Debugging Native and Java Code with WDB

Page 72

Tools for

Debugging

gdb

Examine Instructions at Breakpoint

(gdb) x/16i $pc-32 - inlined java/net/SocketInputStream::read() code

0x6e411ce4: cmpib,=,n 0,%r9,0x6e411d20 ; if r9 (length) == 0 branch

0x6e411ce8: nop

0x6e411cec: copy %r7,%r26 ; load the argument registers

0x6e411cf0: copy %r5,%r25

0x6e411cf4: copy %r8,%r24

0x6e411cf8: copy %r9,%r23

0x6e411cfc: b,l,n 0x6e410a60,%rp ; java/net/SocketInputStream::socketRead

0x6e411d00: nop

0x6e411d04

: ldw -0xa0(%sp),%r22

0x6e411d08: ldw 0x14(%r22),%r21

0x6e411d0c: add,l %r21,%ret0,%r22

0x6e411d10: cmpib,>=,n 0,%ret0,0x6e411dfc ; check return value from Read

0x6e411d14: nop

0x6e411d18: ldw -0xa0(%sp),%r21

0x6e411d1c: stw %r22,0x10(%r21)

0x6e411d20: ldw -0x64(%sp),%r4