Stores a byte of data from a general-purpose register into a specified location in memory.
The stb instruction stores bits 24-31 of general-purpose register (GPR) RS into a byte of storage addressed by the effective address (EA).
If GPR RA is not 0, the EA is the sum of the contents of GPR RA and D, a 16-bit signed two's complement integer sign-extended to 32 bits. If GPR RA is 0, then the EA is D.
The stb instruction has one syntax form and does not affect the Fixed-Point Exception Register or Condition Register Field 0.
|RS||Specifies source general-purpose register of stored data.|
|D||Specifies a 16-bit, signed two's complement integer sign-extended to 32 bits for EA calculation.|
|RA||Specifies source general-purpose register for EA calculation.|
The following code stores bits 24-31 of GPR 6 into a location in memory:
.csect data[rw] buffer: .long 0 # Assume GPR 4 contains address of csect data[rw]. # Assume GPR 6 contains 0x0000 0060. .csect text[pr] stb 6,buffer(4) # 0x60 is now stored at the address of buffer.
Fixed-Point Load and Store Instructions.