https://issues.dlang.org/show_bug.cgi?id=21914
Issue ID: 21914
Summary: naked assembler functions get wrong offset to
parameters
Product: D
Version: D2
Hardware: All
OS: All
Status: NEW
Severity: regression
Priority: P1
Component: dmd
Assignee: nob...@puremagic.com
Reporter: bugzi...@digitalmars.com
Consider the function:
extern (C++) int insbad(int a, int b) {
asm {
naked ;
mov EAX,a-4+[ESP] ;
mov EBX,b-4+[ESP] ;
}
}
In 2.079 and earlier, the inline assembler assumed that an EBP was set up and
provided offsets to the parameters accordingly. Hence, in the above code, a -4
was inserted to correct for not having EBP pushed on the stack.
Somewhere between 2.079 and 2.090 this was changed to not consider EBP, and the
offsets look like this for the above function:
?insbad@@YAHHH@Z:
mov EAX,[ESP] // should be 4[ESP]
mov EBX,4[ESP] // should be 8[ESP]
The problem looks to be the computation of Para.size in cgcod.d from this PR:
https://github.com/dlang/dmd/pull/9620/files
i.e. my fault.
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