Alexandre Julliard : ntdll: Fix floating point exception codes in Wow64 mode.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6da06c15417d7cf08b21d0e327471e7fd702c4ec
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=6da06c15417d7cf08b21d0e32...

Author: Alexandre Julliard 
Date:   Fri Aug 20 11:33:46 2021 +0200

ntdll: Fix floating point exception codes in Wow64 mode.

Signed-off-by: Alexandre Julliard

---

dlls/ntdll/unix/signal_x86_64.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c
index f541306d950..e6971b4629a 100644
--- a/dlls/ntdll/unix/signal_x86_64.c
+++ b/dlls/ntdll/unix/signal_x86_64.c
@@ -2694,7 +2694,10 @@ static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
         break;
     case FPE_FLTINV:
     default:
-        rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
+        if (FPU_sig(ucontext) && FPU_sig(ucontext)->StatusWord & 0x40)
+            rec.ExceptionCode = EXCEPTION_FLT_STACK_CHECK;
+        else
+            rec.ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
         break;
     }

@@ -2703,6 +2706,7 @@ static void fpe_handler( int signal, siginfo_t *siginfo, void *sigcontext )
         rec.NumberParameters = 2;
         rec.ExceptionInformation[0] = 0;
         rec.ExceptionInformation[1] = FPU_sig(ucontext) ? FPU_sig(ucontext)->MxCsr : 0;
+        if (CS_sig(ucontext) != cs64_sel) rec.ExceptionCode = STATUS_FLOAT_MULTIPLE_TRAPS;
     }
     setup_exception( sigcontext, &rec );
 }