Re: [ros-dev] [ros-diffs] [jgardou] 66161: [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:...

[Jérôme Gardou]

Uh, sorry for the horriblly long diff. I guess someone initially
committed the file with CRLF file endings :-/

Le 04/02/2015 17:58, [e-mail] a écrit :
> Author: jgardou
> Date: Wed Feb  4 16:58:41 2015
> New Revision: 66161
>
> URL: http://svn.reactos.org/svn/reactos?rev=66161&view=rev
> Log:
> [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/... and https://bugs.winehq.org/show_bug.cgi?id=21232 for details
>
> Modified:
>     trunk/reactos/include/asm/syscalls.inc
>
> Modified: trunk/reactos/include/asm/syscalls.inc
> URL: http://svn.reactos.org/svn/reactos/trunk/reactos/include/asm/syscalls.inc?re...
> ==============================================================================
> --- trunk/reactos/include/asm/syscalls.inc	[iso-8859-1] (original)
> +++ trunk/reactos/include/asm/syscalls.inc	[iso-8859-1] Wed Feb  4 16:58:41 2015
> @@ -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