ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

ThumbEE
A9.5.4 HBP
HBP (Handler Branch with Parameter) causes a branch to a specified handler. It passes a 3-bit parameter to
the handler in R8.
Encoding E1 ThumbEE
HBP #, #
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 0 0 0 0 0 0 imm3 handler
imm32 = ZeroExtend(imm3, 32); handler_offset = ZeroExtend(handler:’00000’, 32);
Assembler syntax
HBP #, #
where:
See Standard assembler syntax fields on page A8-7.
The parameter to pass to the handler, in the range 0-7.
The index number of the handler to be called, in the range 0-31.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
R[8] = imm32;
BranchWritePC(TEEHBR + handler_offset);
Exceptions
None.
A9-18 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B