Load the application program l4003.rec (bubble sort).
PMON> load
Downloading from ethernet, ^C to abort
Entry address is 80000200
total = 0x1280 bytes
Disassemble the program.
PMON> l
_start 0c0001ba jal CpuInit # 0x800006e8
_start+0x4 00000000 nop
_start+0x8 3c01a000 lui at,0xa000 # 40960
_start+0xc 02018025 or s0,s0,at
_start+0x10 0200f809 jalr s0
_start+0x14 24040003 addiu a0,zero,0x3
_start+0x18 0200f809 jalr s0
_start+0x1c 24040004 addiu a0,zero,0x4
_start+0x20 0c0002a4 jal clrbss # 0x80000a90
_start+0x24 00000000 nop
more... q
Go from here to 'main'. Go must only be used once, from then on
you must use the 'c' (continue) command.
PMON> g . main
main 27bdffe0 addiu sp,sp,0xffe0 # -32
Disassemble but only show calls.
PMON> l -c
main+0xc 0c00014f jal _puts # 0x8000053c
main+0x14 0c0000bf jal init # 0x800002fc
main+0x1c 0c0000f8 jal sort # 0x800003e0
main+0x24 0c00014f jal _puts # 0x8000053c
init+0x14 0c000140 jal malloc # 0x80000500
init+0x74 0c0000e8 jal insert # 0x800003a0
sort+0x58 0c00011e jal swap # 0x80000478
_puts+0x38 0c00018b jal sio_putc # 0x8000062c
_puts+0x4c 0c00018b jal sio_putc # 0x8000062c
sio_putc+0x14 0c000170 jal sio_init # 0x800005c0
more... q
Continue until the function init.
PMON> c init
init 27bdffe0 addiu sp,sp,0xffe0 # -32
Continue until the address in register ra,
i.e., until this function returns.
PMON> c @ra
main+0x1c 0c0000f8 jal sort # 0x800003e0
Single step into the function sort.
PMON> t
sort 8f8e8028 lw t6,-32728(gp) # 0xffff8028
Disassemble.
PMON> l
sort 8f8e8028 lw t6,-32728(gp) # 0xffff8028
sort+0x4 27bdffd8 addiu sp,sp,0xffd8 # -40
sort+0x8 11c0001f beq t6,zero,sort+0x88 # 0x80000468
sort+0xc afbf0014 sw ra,20(sp) # 0x14
sort+0x10 8f8f8028 lw t7,-32728(gp) # 0xffff8028
sort+0x14 afa00024 sw zero,36(sp) # 0x24
sort+0x18 afaf0020 sw t7,32(sp) # 0x20
sort+0x1c 8fb80020 lw t8,32(sp) # 0x20
sort+0x20 00000000 nop
sort+0x24 8f190000 lw t9,0(t8)
more... q
Single step.
PMON> t
sort+0x4 27bdffd8 addiu sp,sp,0xffd8 # -40
Single step by pressing the return key (repeat last command).
PMON>
sort+0x8 11c0001f beq t6,zero,sort+0x88 # 0x80000468
PMON>
sort+0x10 8f8f8028 lw t7,-32728(gp) # 0xffff8028
PMON>
sort+0x14 afa00024 sw zero,36(sp) # 0x24
PMON>
sort+0x18 afaf0020 sw t7,32(sp) # 0x20
PMON>
sort+0x1c 8fb80020 lw t8,32(sp) # 0x20
PMON>
sort+0x20 00000000 nop
PMON>
sort+0x24 8f190000 lw t9,0(t8)
PMON>
sort+0x28 00000000 nop
Disassemble.
PMON> l
sort+0x28 00000000 nop
sort+0x2c 13200012 beq t9,zero,sort+0x78 # 0x80000458
sort+0x30 afb9001c sw t9,28(sp) # 0x1c
sort+0x34 8fa80020 lw t0,32(sp) # 0x20
sort+0x38 8faa001c lw t2,28(sp) # 0x1c
sort+0x3c 9509000a lhu t1,10(t0) # 0xa
sort+0x40 954b000a lhu t3,10(t2) # 0xa
sort+0x44 00000000 nop
sort+0x48 0169082b sltu at,t3,t1
sort+0x4c 10200008 beq at,zero,sort+0x70 # 0x80000450
more... q
Disassemble calls only.
PMON> l -c
sort+0x58 0c00011e jal swap # 0x80000478
_puts+0x38 0c00018b jal sio_putc # 0x8000062c
_puts+0x4c 0c00018b jal sio_putc # 0x8000062c
sio_putc+0x14 0c000170 jal sio_init # 0x800005c0
CpuInit+0x4 0c0000a8 jal getmachtype # 0x800002a0
CpuInit+0x38 0100f809 jalr t0
searching.. ^C-break!
sort+0x28 00000000 nop
Continue until sort+58.
PMON> c sort+58
sort+0x58 0c00011e jal swap # 0x80000478
Single step over the function swap.
PMON> to
sort+0x60 240c0001 addiu t4,zero,0x1
Continue until the function swap.
PMON> c swap
swap 8c8e0004 lw t6,4(a0)
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