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jsr_w † c9 1100 1001 4: branchbyte1, branchbyte2, branchbyte3, branchbyte4 → address jump to subroutine at branchoffset (signed int constructed from unsigned bytes branchbyte1 << 24 | branchbyte2 << 16 | branchbyte3 << 8 | branchbyte4) and place the return address on the stack l2d 8a 1000 1010 value → result convert a long to a double l2f 89
Next, up to 63 word arguments may be placed on the stack. The caller then adds the number of arguments to the MARK opcode and pushes that result on the stack. The value of SP is copied to R5. Finally, a JSR PC,address is executed to call the subroutine. After executing its code, the subroutine terminates with an RTS R5. This loads the value in ...
JSR, in the general subroutine branch form, is two bytes and can access any memory location directly. JSRP is a single-byte form of subroutine branch that can access only the locations in the third 64-byte page. This page is called the subroutine page or page 2, numbered from zero. A JSRP cannot be coded from inside page 2 or 3.
In a Wheeler subroutine, this address was normally set to a dummy number, say 0. To call the routine, the address of the caller would be placed in the accumulator and then the code would jump to the starting point of the routine. The first instructions in the routine would calculate the return address based on the value in the accumulator ...
When executing JSR (jump to subroutine) and RTS (return from subroutine) instructions, the return address pushed to the stack by JSR is that of the last byte of the JSR operand (that is, the most significant byte of the subroutine address), rather than the address of the following instruction.
An indirect branch (also known as a computed jump, indirect jump and register-indirect jump) is a type of program control instruction present in some machine language instruction sets. Rather than specifying the address of the next instruction to execute , as in a direct branch , the argument specifies where the address is located.
Download as PDF; Printable version; ... Appearance. move to sidebar hide. JSR may refer to: Computing. Jump to subroutine, an assembly language instruction; Java ...
A conditional jump-if-zero branch that jumps only if the top-of-stack value is zero could be implemented as shown below. This example uses the embedded parameter version of direct threading so the &thread[123] line is the destination of where to jump if the condition is true, so it must be skipped (ip++) over if the branch is not taken.