APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary Users Manual S15543EJ1V0UM 509
LDR Load Doubleword Right (2/3) LDR
The contents of general register
rt
are internally bypassed within the processor so that no NOP is needed between
an immediately preceding load instruction which specifies register
rt
and a following LDR (or LDL) instruction which
also specifies register
rt
.
No address error exceptions due to alignment are possible.
This operation is defined in 64-bit mode or in 32-bit kernel mode. Execution of this instruction in 32-bit user or
supervisor mode causes a reserved instruction exception.
Operation:
64 T: vAddr ((offset 15)48 || offset15..0) + GPR [base]
(pAddr, uncached) AddressTranslation (vAddr, DATA)
pAddr pAddrPSIZE - 1..3 || (pAddr2..0 xor ReverseEndian3)
if BigEndianMem = 1 then
pAddr pAddrPSIZE - 1..3 || 03
endif
byte vAddr2..0 xor BigEndianCPU3
mem LoadMemory (uncached, DOUBLEWORD-byte, pAddr, vAddr, DATA)
GPR [rt] GPR [rt]63..64 8 * byte || mem63..8 * byte