On 1/27/2022 6:24 AM, Tony Thigpen wrote:
The answer seems to be that, while not fully known, if one of the literals is present, the called program can safely know that they have at least the x'08' to x'7F' are to start double-word registers. Do you at least agree to that conclusion?
Whaaaat?! You're saying that you want to depend on what a previous callee put at +4 to determine something about the length of the caller's save area? That makes no sense!
Suppose that previous callee put an incorrect literal at +4 (e.g., F4SA) and then abended attempting to use bytes that didn't exist in the caller's save area. And, after recovering from that abend, the caller is now calling you. Why would you wish to depend on that incorrect value at +4?
Why must we have these "Rube Goldberg" discussions in the first place? Can't we just follow the linkage conventions as documented and leave it at that?
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