[PATCH] msvcrt : add arm implementation for _control87

[Vijay Kiran Kamuju]

Signed-off-by: Vijay Kiran Kamuju <infyquest(a)gmail.com>
---
 dlls/msvcrt/math.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/dlls/msvcrt/math.c b/dlls/msvcrt/math.c
index b7288cf6cf..a5967b7b6c 100644
--- a/dlls/msvcrt/math.c
+++ b/dlls/msvcrt/math.c
@@ -1233,6 +1233,48 @@ unsigned int CDECL _control87(unsigned int newval, unsigned int mask)
 
     if ((x86_cw ^ sse2_cw) & (MSVCRT__MCW_EM | MSVCRT__MCW_RC)) x86_cw |= MSVCRT__EM_AMBIGUOUS;
     return x86_cw;
+#elif defined(__arm__)
+    unsigned long fpword;
+    unsigned int flags = 0;
+
+    __asm__ __volatile__( "vmrs %0, fpscr" : "=r" (fpword) );
+    if (fpword & 0x1)  flags |= MSVCRT__EM_INVALID;
+    if (fpword & 0x2)  flags |= MSVCRT__EM_ZERODIVIDE;
+    if (fpword & 0x4)  flags |= MSVCRT__EM_OVERFLOW;
+    if (fpword & 0x8)  flags |= MSVCRT__EM_UNDERFLOW;
+    if (fpword & 0x10) flags |= MSVCRT__EM_INEXACT;
+    if (fpword & 0x40) flags |= MSVCRT__EM_DENORMAL;
+    switch (fpword & 0x60000)
+    {
+    case 0x60000: flags |= MSVCRT__RC_UP|MSVCRT__RC_DOWN; break;
+    case 0x40000: flags |= MSVCRT__RC_DOWN; break;
+    case 0x20000: flags |= MSVCRT__RC_UP; break;
+    }
+    if (fpword & 0x80000) flags |= MSVCRT__DN_FLUSH;
+
+    TRACE( "arm flags=%08x newval=%08x mask=%08x\n", flags, newval, mask );
+    if (mask)
+    {
+        flags = (flags & ~mask) | (newval & mask);
+
+        /* Convert (masked) value back to fp word */
+        fpword = 0;
+        if (flags & MSVCRT__EM_INVALID)    fpword |= 0x1;
+        if (flags & MSVCRT__EM_ZERODIVIDE) fpword |= 0x2;
+        if (flags & MSVCRT__EM_OVERFLOW)   fpword |= 0x4;
+        if (flags & MSVCRT__EM_UNDERFLOW)  fpword |= 0x8;
+        if (flags & MSVCRT__EM_INEXACT)    fpword |= 0x10;
+        if (flags & MSVCRT__EM_DENORMAL)   fpword |= 0x40;
+        switch (flags & MSVCRT__MCW_RC)
+        {
+        case MSVCRT__RC_UP|MSVCRT__RC_DOWN: fpword |= 0x60000; break;
+        case MSVCRT__RC_DOWN:               fpword |= 0x40000; break;
+        case MSVCRT__RC_UP:                 fpword |= 0x20000; break;
+        }
+        if (flags & MSVCRT__DN_FLUSH) fpword |= 0x80000;
+        __asm__ __volatile__( "vmsr	fpscr, %0" : : "r" (fpword) );
+    }
+    return flags;
 #else
     FIXME( "not implemented\n" );
     return 0;
-- 
2.15.0