From f8de8636987052f8f2d455183b8e8a4c0d74ddcc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Gardou?= <jerome.gardou@reactos.org>
Date: Wed, 4 Feb 2015 16:58:41 +0000
Subject: [PATCH] [NTDLL]  - use the edx register to store the function pointer
 to the syscall trampoline. This is how google Chrome checks if an exported
 function is a system call or not. See
 https://chromium.googlesource.com/chromium/src.git/+/master/sandbox/win/src/service_resolver_32.cc
 and https://bugs.winehq.org/show_bug.cgi?id=21232 for details

svn path=/trunk/; revision=66161
---
 reactos/include/asm/syscalls.inc | 218 +++++++++++++++----------------
 1 file changed, 109 insertions(+), 109 deletions(-)

diff --git a/reactos/include/asm/syscalls.inc b/reactos/include/asm/syscalls.inc
index c1d58ac9bfd..8c980f2ae64 100644
--- a/reactos/include/asm/syscalls.inc
+++ b/reactos/include/asm/syscalls.inc
@@ -1,109 +1,109 @@
-
-#ifdef _M_IX86
-#define KUSER_SHARED_SYSCALL HEX(7ffe0300)
-#define KGDT_R0_CODE 8
-MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
-    StackBytes = 4 * ArgCount
-    FPO 0, 0, 0, 0, 0, FRAME_FPO
-    mov eax, SyscallId
-    mov ecx, KUSER_SHARED_SYSCALL
-    call dword ptr [ecx]
-    ret StackBytes
-ENDM
-MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
-    StackBytes = 4 * &ArgCount
-    FPO 0, 0, 0, 0, 0, FRAME_FPO
-    mov eax, SyscallId
-    lea edx, [esp + 4]
-    pushfd
-    push KGDT_R0_CODE
-    call _KiSystemService
-    ret StackBytes
-ENDM
-#elif defined(_M_AMD64)
-MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
-    .ENDPROLOG
-    mov eax, SyscallId
-    mov r10, rcx
-    syscall
-    ret
-ENDM
-MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
-    .ENDPROLOG
-    EXTERN Nt&Name:PROC
-    lea rax, Nt&Name[rip]
-    mov r10, ArgCount * 8
-    jmp KiZwSystemService
-ENDM
-#elif defined(_M_ARM)
-MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
-    swi #SyscallId
-    bx lr
-ENDM
-MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
-    mov ip, lr
-    swi #SyscallId
-    bx ip
-ENDM
-#elif defined(_M_PPC)
-MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
-    stwu 1,-16(1)
-    mflr 0
-    stw  0,0(1)
-    li   0, SyscallId
-    sc
-    lwz 0,0(1)
-    mtlr 0
-    addi 1,1,16
-    blr
-ENDM
-#define STUBCODE_K STUBCODE_U
-#elif defined(_M_MIPS)
-MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
-    li $8, KUSER_SHARED_SYSCALL
-    lw $8,0($8)
-    j $8
-    nop
-ENDM
-MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
-    j KiSystemService
-    nop
-ENDM
-#else
-#error unsupported architecture
-#endif
-
-#ifdef _M_IX86
-MACRO(MAKE_LABEL, Name, StackBytes)
-    PUBLIC _&Name&@&StackBytes
-    _&Name&@&StackBytes:
-ENDM
-MACRO(START_PROC, Name, StackBytes)
-    PUBLIC _&Name&@&StackBytes
-    .PROC _&Name&@&StackBytes
-ENDM
-#else
-MACRO(MAKE_LABEL, Name, StackBytes)
-    PUBLIC &Name
-    &Name:
-ENDM
-MACRO(START_PROC, Name, StackBytes)
-    PUBLIC &Name
-    .PROC &Name
-ENDM
-#endif
-
-MACRO(STUB_U, Name, ArgCount)
-    MAKE_LABEL Zw&Name, %ArgCount * 4
-    START_PROC Nt&Name, %ArgCount * 4
-    STUBCODE_U Name, SyscallId, %ArgCount
-    .ENDP
-    SyscallId = SyscallId + 1
-ENDM
-
-MACRO(STUB_K, Name, ArgCount)
-    START_PROC Zw&Name, %ArgCount * 4
-    STUBCODE_K Name, SyscallId, %ArgCount
-    .ENDP
-    SyscallId = SyscallId + 1
-ENDM
+
+#ifdef _M_IX86
+#define KUSER_SHARED_SYSCALL HEX(7ffe0300)
+#define KGDT_R0_CODE 8
+MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
+    StackBytes = 4 * ArgCount
+    FPO 0, 0, 0, 0, 0, FRAME_FPO
+    mov eax, SyscallId
+    mov edx, KUSER_SHARED_SYSCALL
+    call dword ptr [edx]
+    ret StackBytes
+ENDM
+MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
+    StackBytes = 4 * &ArgCount
+    FPO 0, 0, 0, 0, 0, FRAME_FPO
+    mov eax, SyscallId
+    lea edx, [esp + 4]
+    pushfd
+    push KGDT_R0_CODE
+    call _KiSystemService
+    ret StackBytes
+ENDM
+#elif defined(_M_AMD64)
+MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
+    .ENDPROLOG
+    mov eax, SyscallId
+    mov r10, rcx
+    syscall
+    ret
+ENDM
+MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
+    .ENDPROLOG
+    EXTERN Nt&Name:PROC
+    lea rax, Nt&Name[rip]
+    mov r10, ArgCount * 8
+    jmp KiZwSystemService
+ENDM
+#elif defined(_M_ARM)
+MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
+    swi #SyscallId
+    bx lr
+ENDM
+MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
+    mov ip, lr
+    swi #SyscallId
+    bx ip
+ENDM
+#elif defined(_M_PPC)
+MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
+    stwu 1,-16(1)
+    mflr 0
+    stw  0,0(1)
+    li   0, SyscallId
+    sc
+    lwz 0,0(1)
+    mtlr 0
+    addi 1,1,16
+    blr
+ENDM
+#define STUBCODE_K STUBCODE_U
+#elif defined(_M_MIPS)
+MACRO(STUBCODE_U, Name, SyscallId, ArgCount)
+    li $8, KUSER_SHARED_SYSCALL
+    lw $8,0($8)
+    j $8
+    nop
+ENDM
+MACRO(STUBCODE_K, Name, SyscallId, ArgCount)
+    j KiSystemService
+    nop
+ENDM
+#else
+#error unsupported architecture
+#endif
+
+#ifdef _M_IX86
+MACRO(MAKE_LABEL, Name, StackBytes)
+    PUBLIC _&Name&@&StackBytes
+    _&Name&@&StackBytes:
+ENDM
+MACRO(START_PROC, Name, StackBytes)
+    PUBLIC _&Name&@&StackBytes
+    .PROC _&Name&@&StackBytes
+ENDM
+#else
+MACRO(MAKE_LABEL, Name, StackBytes)
+    PUBLIC &Name
+    &Name:
+ENDM
+MACRO(START_PROC, Name, StackBytes)
+    PUBLIC &Name
+    .PROC &Name
+ENDM
+#endif
+
+MACRO(STUB_U, Name, ArgCount)
+    MAKE_LABEL Zw&Name, %ArgCount * 4
+    START_PROC Nt&Name, %ArgCount * 4
+    STUBCODE_U Name, SyscallId, %ArgCount
+    .ENDP
+    SyscallId = SyscallId + 1
+ENDM
+
+MACRO(STUB_K, Name, ArgCount)
+    START_PROC Zw&Name, %ArgCount * 4
+    STUBCODE_K Name, SyscallId, %ArgCount
+    .ENDP
+    SyscallId = SyscallId + 1
+ENDM