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Darwin: disable new assembler fill*word variants

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They use interprocedural gotos at the assembler level, which is incompatible
with auto-generated CFI
This commit is contained in:
Jonas Maebe 2024-11-20 21:39:19 +01:00
parent 1230e5a623
commit 28e9ebc7da
1 changed files with 23 additions and 10 deletions
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25
rtl/i386/i386.inc
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@ -161,10 +161,19 @@ end;
{$endif FPC_SYSTEM_HAS_MOVE}
{$if not defined(FPC_SYSTEM_HAS_FILLCHAR)
{ Darwin uses Clang to assemble. Recent Clang versions (rightly) give an error when you add global labels in
the middle of .cfi_startproc / .cfi_endproc pairs, since this means you could jump into it from other code
whose CFI state is completely different without the compiler even having the theoretical ability to analyse
all code and generate balanced information.
Since FPC does not attempt it even for local labels, this kind of code is inherently unsafe.
}
{$if not defined(darwin) and
(not defined(FPC_SYSTEM_HAS_FILLCHAR)
or not defined(FPC_SYSTEM_HAS_FILLWORD)
or not defined(FPC_SYSTEM_HAS_FILLDWORD)
or not defined(FPC_SYSTEM_HAS_FILLQWORD)}
or not defined(FPC_SYSTEM_HAS_FILLQWORD)
)}
{$if not defined(FPC_SYSTEM_HAS_FILLCHAR)
or not defined(FPC_SYSTEM_HAS_FILLWORD)
@ -330,7 +339,8 @@ end;
{$endif FillChar/Word/DWord/QWord required.}
{$ifndef FPC_SYSTEM_HAS_FILLCHAR}
{$if not defined(darwin) and
not defined(FPC_SYSTEM_HAS_FILLCHAR)}
{$define FPC_SYSTEM_HAS_FILLCHAR}
procedure FillChar_3OrLess; assembler; nostackframe;
{ cl — x, edx — byte count, Low(int32) <= edx <= 3. }
@ -428,7 +438,8 @@ end;
{$endif FPC_SYSTEM_HAS_FILLCHAR}
{$ifndef FPC_SYSTEM_HAS_FILLWORD}
{$if not defined(darwin) and
not defined(FPC_SYSTEM_HAS_FILLWORD)}
{$define FPC_SYSTEM_HAS_FILLWORD}
procedure FillWord_3OrLess; assembler; nostackframe;
asm
@ -516,7 +527,8 @@ end;
{$endif FPC_SYSTEM_HAS_FILLWORD}
{$ifndef FPC_SYSTEM_HAS_FILLDWORD}
{$if not defined(darwin) and
not defined(FPC_SYSTEM_HAS_FILLDWORD)}
{$define FPC_SYSTEM_HAS_FILLDWORD}
procedure FillDWord_4OrLess; assembler; nostackframe;
asm
@ -590,7 +602,8 @@ end;
{$endif FPC_SYSTEM_HAS_FILLDWORD}
{$ifndef FPC_SYSTEM_HAS_FILLQWORD}
{$if not defined(darwin) and
not defined(FPC_SYSTEM_HAS_FILLQWORD)}
{$define FPC_SYSTEM_HAS_FILLQWORD}
{$ifndef CPUX86_HAS_SSE2}
procedure FillQWord_Plain(var x;count:SizeInt;value:QWord);assembler;nostackframe;