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:...

[Hermès BÉLUSCA - MAÏTO]

About the Wine bug report...: "ils l'ont dans le XXX" ?

-----Message d'origine-----
De : Ros-dev [mailto:[e-mail]] De la part de Jérôme Gardou
Envoyé : mercredi 4 février 2015 18:02
À : ros-dev(a)reactos.org
Objet : 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:...

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

Le 04/02/2015 17:58, jgardou(a)svn.reactos.org 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/wi
>  n/src/service_resolver_32.cc 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?rev=66161&r1=66160&r2=66161&view=diff
>  ==============================================================================
>  --- 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
>  
>   
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