Cmep basics

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Calling convention

$1 = arg0
$2 = arg1
$3 = arg2
$4 = arg3

Unmodified by callee: $5, $6, $7, $8

Clobbered by callee: $9, $10, $11, $12

Configuration

Note: This is dumped with a sm exploit. Some options are read/write so it might differ.

$cfg

0xF00004AA

$ccfg

0x5B105B08

$rcfg

0x01000100

$opt

0x03FD0201

This register is read-only.

CBS = 00: coprocessor data bus width 32-bit
DBS = 00: DSP data bus width 32-bit
0
HWE = 0: hardware engine off
DIV = 1: 32-bit divide instruction on
MUL = 1: multiply instruction on
BIT = 1: bit manipulation instruction on
SAT = 1: saturation instruction on
CLP = 1: clip instruction on
MIN = 1: min/max instruction on
AVE = 1: average instruction on
ABS = 1: abs instruction on
0
LDZ = 1: leading zero instruction on
BIS = 00: bus interface width is 32-bit
LBS = 00: local bus interface width is 32-bit
0
TCN = 010: 2 timer/counter channels
0
VL64 = 0: 64-bit VLIW off
VL32 = 0: 32-bit VLIW off
COP = 0: coprocessor off
0
DSP = 0: DSP off
UCI = 0: UCI off
DBG = 1: DBG on