https://git.reactos.org/?p=reactos.git;a=commitdiff;h=12dfa8ce390917db814d0ace0c40ffc376fa6c04
commit 12dfa8ce390917db814d0ace0c40ffc376fa6c04 Author: Jérôme Gardou <[email protected]> AuthorDate: Mon Mar 22 12:39:08 2021 +0100 Commit: Jérôme Gardou <[email protected]> CommitDate: Wed Mar 31 18:35:31 2021 +0200 [WIN32K] Fix getting long value from float object Most importantly, do not shift 32-bit integers by 32 or more. --- win32ss/CMakeLists.txt | 1 + win32ss/gdi/eng/floatobj.h | 23 ++++++++++------------- win32ss/gdi/eng/i386/floatobj.S | 34 +--------------------------------- win32ss/gdi/eng/i386/floatobj.c | 22 ++++++++++++++++++++++ 4 files changed, 34 insertions(+), 46 deletions(-) diff --git a/win32ss/CMakeLists.txt b/win32ss/CMakeLists.txt index 44dc77cd381..727461031cd 100644 --- a/win32ss/CMakeLists.txt +++ b/win32ss/CMakeLists.txt @@ -213,6 +213,7 @@ list(APPEND ASM_SOURCE gdi/dib/i386/dib32bpp_hline.s gdi/dib/i386/dib32bpp_colorfill.s gdi/eng/i386/floatobj.S) +list(APPEND SOURCE gdi/eng/i386/floatobj.c) else() list(APPEND SOURCE gdi/dib/dib24bppc.c diff --git a/win32ss/gdi/eng/floatobj.h b/win32ss/gdi/eng/floatobj.h index aa85a4e80b5..5cad6830af6 100644 --- a/win32ss/gdi/eng/floatobj.h +++ b/win32ss/gdi/eng/floatobj.h @@ -16,15 +16,6 @@ _FLOATOBJ_Equal(FLOATOBJ *pf1, FLOATOBJ *pf2) } #define FLOATOBJ_Equal _FLOATOBJ_Equal -FORCEINLINE -LONG -_FLOATOBJ_GetLong(FLOATOBJ *pf) -{ - EFLOAT_S *pef = (EFLOAT_S*)pf; - return pef->lMant >> (32 - pef->lExp); -} -#define FLOATOBJ_GetLong _FLOATOBJ_GetLong - /*! * \brief Converts a FLOATOBJ into a LONG by truncating the value to integer * @@ -37,16 +28,22 @@ _FLOATOBJ_GetLong(FLOATOBJ *pf) */ FORCEINLINE BOOL -FASTCALL FLOATOBJ_bConvertToLong(FLOATOBJ *pf, PLONG pl) { EFLOAT_S *pef = (EFLOAT_S*)pf; - LONG lShift = 32 - pef->lExp; - if (lShift < 0) + + if (pef->lExp > 32) { return FALSE; } - *pl = pef->lMant >> lShift; + + if (pef->lExp < 2) + { + *pl = 0; + return TRUE; + } + + *pl = EngMulDiv(pef->lMant, 1 << (pef->lExp - 2), 0x40000000); return TRUE; } diff --git a/win32ss/gdi/eng/i386/floatobj.S b/win32ss/gdi/eng/i386/floatobj.S index 7eb9f64cb76..0b36e1b4559 100644 --- a/win32ss/gdi/eng/i386/floatobj.S +++ b/win32ss/gdi/eng/i386/floatobj.S @@ -52,7 +52,7 @@ * FLOATOBJ_SetFloat - implemented, tested * FLOATOBJ_SetLong - implemented, tested * FLOATOBJ_GetFloat - implemented, tested - * FLOATOBJ_GetLong - implemented, tested + * FLOATOBJ_GetLong - implemented in C * FLOATOBJ_Equal - implemented, tested * FLOATOBJ_EqualLong - implemented * FLOATOBJ_GreaterThan - implemented @@ -249,34 +249,6 @@ SetLong0: ret 8 -/******************************************************************************* - * LONG - * APIENTRY - * FLOATOBJ_GetLong(IN PFLOATOBJ pf); - * - */ -_FLOATOBJ_GetLong@4: -PUBLIC _FLOATOBJ_GetLong@4 - push ebp - mov ebp, esp - - mov edx, [ebp + PARAM1] /* Load pf into edx */ - mov ecx, 32 /* Load (32 - lExp) into ecx */ - sub ecx, [edx + lExp] - jle short GetLong2 /* Check for Overflow */ - - mov eax, [edx + lMant] /* Load mantissa into eax */ - sar eax, cl /* Signed shift mantissa according to exponent */ - - pop ebp /* Return */ - ret 4 - -GetLong2: - xor eax, eax /* Overflow, return 0 */ - pop ebp - ret 4 - - /****************************************************************************** * BOOL * APIENTRY @@ -842,7 +814,6 @@ PUBLIC _FLOATOBJ_DivLong@8 pop ebp ret 8 - /******************************************************************************* * VOID * APIENTRY @@ -940,7 +911,6 @@ AddIs0: pop ebp ret 8 - /****************************************************************************** * VOID * APIENTRY @@ -998,7 +968,6 @@ PUBLIC _FLOATOBJ_AddLong@8 pop ebp ret 8 - /******************************************************************************* * VOID * APIENTRY @@ -1095,7 +1064,6 @@ SubIs0: mov dword ptr [eax + lExp], 0 pop ebp ret 8 - /****************************************************************************** * VOID * APIENTRY diff --git a/win32ss/gdi/eng/i386/floatobj.c b/win32ss/gdi/eng/i386/floatobj.c new file mode 100644 index 00000000000..d5b623d164f --- /dev/null +++ b/win32ss/gdi/eng/i386/floatobj.c @@ -0,0 +1,22 @@ +/* + * PROJECT: ReactOS win32 kernel mode subsystem + * LICENSE: GPL - See COPYING in the top level directory + * FILE: win32ss/gdi/eng/i386/floatobj.c + * PURPOSE: FLOATOBJ API + * PROGRAMMERS: Jérôme Gardou + */ + +/** Includes ******************************************************************/ + +#include <win32k.h> +#define NDEBUG +#include <debug.h> + +LONG +APIENTRY +FLOATOBJ_GetLong(FLOATOBJ* pf) +{ + LONG val = 0; + (void)FLOATOBJ_bConvertToLong(pf, &val); + return val; +}
