Boots – shoes – and leggings
Patent
1981-05-22
1985-01-08
Springborn, Harvey E.
Boots, shoes, and leggings
G06F 300, G06F 922, G06F 936, G06F 946
Patent
active
044930275
ABSTRACT:
A method for executing call and return instructions in a digital computer system operating under control of microcode. The microcode may specify calls to and returns from sequences of microinstructions. A call microinstruction sequence corresponds to the call instruction. The call microcode in turn calls other microinstruction sequences for deriving pointers representing the location of the called procedure and of arguments from operands in the call instruction. As the call microcode obtains each argument pointer, it places the pointer on the stack. After it has obtained all of the argument pointers, it passes the pointer to the called procedure and a pointer to the argument pointers to a general call microinstruction sequence. That microinstruction sequence locates the called procedure, makes a new frame including the argument pointers, and saves the state necessary to resume execution of the call microinstruction sequence itself. It then obtains the state necessary to commence execution of the called procedure and causes execution of that procedure to commence. The microcode corresponding to the return instruction restores both the state necessary to resume execution of the calling procedure and the state necessary to resume execution of the call microinstruction sequence. When it resumes execution, the call microinstruction sequence completes the return operation.
REFERENCES:
patent: 3990054 (1976-11-01), Perlowski
patent: 4047247 (1977-09-01), Stanley et al.
patent: 4128878 (1978-12-01), Yasuhara et al.
Bouricius et al., "Subroutine Calling Technique," IBM T. D. B., vol. 12, No. 4, Sep. 1969, L73900019.
Ahlstrom John K.
Belgard Richard A.
Bernstein David H.
Bratt Richard G.
Farber David A.
Data General Corporation
Frank Jacob
Nelson Gordon E.
Springborn Harvey E.
Wall Joel
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