Specifications

Example
break
Description
Breaks program execution and transfers control to the
debugger break-processing routine. Saves the address of the
next instruction in register ba and saves the contents of the
status register in bstatus. Disables interrupts, then transfers
execution to the break handler.
The 5-bit immediate field imm5 is ignored by the processor, but
it can be used by the debugger.
break with no argument is the same as break 0.
Usage
break is used by debuggers exclusively. Only debuggers should
place break in a user program, operating system, or exception
handler. The address of the break handler is specified with the
Nios_II Processor parameter editor in Qsys.
Some debuggers support break and break 0 instructions in
source code. These debuggers treat the break instruction as a
normal breakpoint.
Exceptions
Break
Instruction Type
R
Instruction Fields
IMM5 = Type of breakpoint
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0 0 0x1e 0x34
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x34 IMM5 0x3a
bret
Instruction
breakpoint return
Operation
status ← bstatus
PC ← ba
Assembler Syntax
bret
Example
bret
Description
Copies the value of bstatus to the status register, then
transfers execution to the address in ba.
NII51017
2015.04.02
bret
8-19
Instruction Set Reference
Altera Corporation
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