diff options
Diffstat (limited to 'StdLib/LibC/CRT/Ia32/lldvrm.c')
-rw-r--r-- | StdLib/LibC/CRT/Ia32/lldvrm.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/StdLib/LibC/CRT/Ia32/lldvrm.c b/StdLib/LibC/CRT/Ia32/lldvrm.c new file mode 100644 index 0000000000..26e4ef8d53 --- /dev/null +++ b/StdLib/LibC/CRT/Ia32/lldvrm.c @@ -0,0 +1,100 @@ +/** @file
+ 64-bit Math Worker Function.
+ The 32-bit versions of C compiler generate calls to library routines
+ to handle 64-bit math. These functions use non-standard calling conventions.
+
+ Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
+ This program and the accompanying materials are licensed and made available
+ under the terms and conditions of the BSD License which accompanies this
+ distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/BaseLib.h>
+
+
+/*
+ * Divides a 64-bit signed value by another 64-bit signed value and returns
+ * the 64-bit signed result and the 64-bit signed remainder.
+ */
+__declspec(naked) void __cdecl _alldvrm(void)
+{
+ //
+ // Wrapper Implementation over EDKII DivS64x64Remainder() routine
+ // INT64
+ // EFIAPI
+ // DivS64x64Remainder (
+ // IN INT64 Dividend,
+ // IN INT64 Divisor,
+ // OUT INT64 *Remainder
+ // )
+ //
+ _asm {
+ ; Original local stack when calling _alldvrm
+ ; -----------------
+ ; | |
+ ; |---------------|
+ ; | |
+ ; |-- Divisor --|
+ ; | |
+ ; |---------------|
+ ; | |
+ ; |-- Dividend --|
+ ; | |
+ ; |---------------|
+ ; | ReturnAddr** |
+ ; ESP---->|---------------|
+ ;
+ ;
+ ; On Exit:
+ ; EDX:EAX contains the quotient (dividend/divisor)
+ ; EBX:ECX contains the remainder (divided % divisor)
+ ; NOTE: this routine removes the parameters from the stack.
+ ;
+
+ ;
+ ; Set up the local stack for Reminder pointer
+ ;
+ sub esp, 8
+ push esp
+
+ ;
+ ; Set up the local stack for Divisor parameter
+ ;
+ mov eax, [esp + 28]
+ push eax
+ mov eax, [esp + 28]
+ push eax
+
+ ;
+ ; Set up the local stack for Dividend parameter
+ ;
+ mov eax, [esp + 28]
+ push eax
+ mov eax, [esp + 28]
+ push eax
+
+ ;
+ ; Call native DivS64x64Remainder of BaseLib
+ ;
+ call DivS64x64Remainder
+
+ ;
+ ; EDX:EAX contains the quotient (dividend/divisor)
+ ; Put the Remainder in EBX:ECX
+ ;
+ mov ecx, [esp + 20]
+ mov ebx, [esp + 24]
+
+ ;
+ ; Adjust stack
+ ;
+ add esp, 28
+
+ ret 16
+ }
+}
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