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- Implement SYSCALL_PROLOG for the main handler and the three fast-system calls (ints 2b, 2c, 2d) which are not yet implemented.
- Document the macros. svn path=/trunk/; revision=20935
This commit is contained in:
Alex Ionescu
parent
087083224f
commit
93c504407b
2 changed files with 138 additions and 78 deletions
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@ -234,15 +234,123 @@
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SET_TF_DEBUG_HEADER
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//
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// @name TRAP_EPILOG
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// @name SYSCALL_PROLOG
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//
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// This macro creates a standard trap entry prologue.
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// It should be used for entry into any kernel trap (KiTrapXx), but not for
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// system calls, which require special handling.
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// This macro creates a system call entry prologue.
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// It should be used for entry into any fast-system call (KiGetTickCount,
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// KiCallbackReturn, KiRaiseAssertion) and the generic system call handler
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// (KiSystemService)
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//
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// @param Label
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// Identifying name of the caller function; will be used to append
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// to the name V86 and DR helper functions, which must already exist.
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// Unique label identifying the name of the caller function; will be
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// used to append to the name of the DR helper function, which must
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// already exist.
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//
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// @remark None.
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//
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.macro SYSCALL_PROLOG
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/* Create a trap frame */
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push 0
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push ebp
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push ebx
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push esi
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push edi
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push fs
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/* Load PCR Selector into fs */
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mov ebx, KGDT_R0_PCR
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mov fs, bx
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/* Get a pointer to the current thread */
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mov esi, [fs:KPCR_CURRENT_THREAD]
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/* Save the previous exception list */
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push [fs:KPCR_EXCEPTION_LIST]
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/* Set the exception handler chain terminator */
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mov dword ptr [fs:KPCR_EXCEPTION_LIST], -1
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/* Save the old previous mode */
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push ss:[esi+KTHREAD_PREVIOUS_MODE]
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/* Skip the other registers */
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sub esp, 0x48
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/* Hack: it seems that on VMWare someone damages ES/DS on exit. Investigate! */
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mov [esp+KTRAP_FRAME_DS], ds
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mov [esp+KTRAP_FRAME_ES], es
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/* Set the new previous mode based on the saved CS selector */
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mov ebx, [esp+0x6C]
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and ebx, 1
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mov byte ptr ss:[esi+KTHREAD_PREVIOUS_MODE], bl
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/* Go on the Kernel stack frame */
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mov ebp, esp
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/* Save the old trap frame pointer where EDX would be saved */
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mov ebx, [esi+KTHREAD_TRAP_FRAME]
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mov [ebp+KTRAP_FRAME_EDX], ebx
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/* Flush DR7 */
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and dword ptr [ebp+KTRAP_FRAME_DR7], 0
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/* Check if the thread was being debugged */
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test byte ptr [esi+KTHREAD_DEBUG_ACTIVE], 0xFF
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/* Set the thread's trap frame and clear direction flag */
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mov [esi+KTHREAD_TRAP_FRAME], ebp
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cld
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/* Save DR registers if needed */
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//jnz Dr_kss_&Label
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/* Set the trap frame debug header */
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SET_TF_DEBUG_HEADER
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#ifdef DBG // FIXME: Is this for GDB? Can it be moved in the stub?
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/*
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* We want to know the address from where the syscall stub was called.
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* If PrevMode is KernelMode, that address is stored in our own (kernel)
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* stack, at location KTRAP_FRAME_ESP.
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* If we're coming from UserMode, we load the usermode stack pointer
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* and go back two frames (first frame is the syscall stub, second call
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* is the caller of the stub).
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*/
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mov edi, [ebp+KTRAP_FRAME_ESP]
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test byte ptr [esi+KTHREAD_PREVIOUS_MODE], 0x01
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jz 0f
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mov edi, [edi+4]
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0:
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mov [ebp+KTRAP_FRAME_DEBUGEIP], edi
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#endif
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/* Enable interrupts */
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sti
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.endm
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//
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// @name TRAP_EPILOG
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//
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// This macro creates an epilogue for leaving any system trap.
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// It is used for exiting system calls, exceptions, interrupts and generic
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// traps.
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//
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// @param SystemCall
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// Specifies whether this trap will exit a system call. If so, special
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// code will be assembled to potentially use SYSEXIT instead of IRETD.
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//
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// @param RestorePreviousMode
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// Specifies if the previous mode should be restored.
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//
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// @param RestoreSegments
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// Specifies if the segment registers should be restored.
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//
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// @param RestoreVolatiles
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// Specifies if the volatile registers should be restored.
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//
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// @param RestoreAllRegs
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// Specifies if volatiles and segments should both be restored.
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//
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// @remark
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//
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@ -13,22 +13,33 @@
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.globl _KiFastCallEntry
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.globl _KiSystemService
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.globl _KiDebugService
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.globl _Kei386EoiHelper@0
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.globl _NtRaiseException@12
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.globl _NtContinue@8
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.intel_syntax noprefix
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/*
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* FIXMEs:
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* - Figure out why ES/DS gets messed up in VMWare, when doing KiServiceExit only,
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* and only when called from user-mode, and returning to user-mode.
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* - Implement SYSCALL_PROLOG macro.
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*/
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/*** This file is a mess; it is being worked on. Please contact Alex:
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*** alex@relsoft.net if you want to make any changes to it before this
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*** message goes away
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* - Merge with trap.S and document all traps.
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* - Use MmProbe when copying arguments to syscall.
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* - Add DR macro/save and VM macro/save.
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* - Implement KiCallbackReturn, KiGetTickCount, KiRaiseAssertion
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*/
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/* FUNCTIONS ***************************************************************/
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.func KiSystemService
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_KiSystemService:
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/* Enter the shared system call prolog */
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SYSCALL_PROLOG
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/* Jump to the actual handler */
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jmp SharedCode
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.endfunc
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BadStack:
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/* Restore ESP0 stack */
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@ -123,68 +134,12 @@ _KiFastCallEntry:
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/* Check if the thread was being debugged */
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test byte ptr [esi+KTHREAD_DEBUG_ACTIVE], 0xFF
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/* Jump to shared code or DR Save */
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//jnz Dr_FastCallDrSave
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jmp SharedCode
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.endfunc
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.func KiSystemService
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_KiSystemService:
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// ==================== COMMON SYSTEM CALL CODE ============//
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/* Create a trap frame */
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push 0
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push ebp
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push ebx
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push esi
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push edi
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push fs
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/* Load PCR Selector into fs */
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mov ebx, KGDT_R0_PCR
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mov fs, bx
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/* Get a pointer to the current thread */
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mov esi, [fs:KPCR_CURRENT_THREAD]
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/* Save the previous exception list */
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push [fs:KPCR_EXCEPTION_LIST]
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/* Set the exception handler chain terminator */
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mov dword ptr [fs:KPCR_EXCEPTION_LIST], -1
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/* Save the old previous mode */
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push ss:[esi+KTHREAD_PREVIOUS_MODE]
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/* Skip the other registers */
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sub esp, 0x48
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/* Hack: it seems that on VMWare someone damages ES/DS on exit. Investigate! */
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mov [esp+KTRAP_FRAME_DS], ds
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mov [esp+KTRAP_FRAME_ES], es
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/* Set the new previous mode based on the saved CS selector */
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mov ebx, [esp+0x6C]
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and ebx, 1
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mov byte ptr ss:[esi+KTHREAD_PREVIOUS_MODE], bl
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/* Go on the Kernel stack frame */
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mov ebp, esp
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/* Save the old trap frame pointer where EDX would be saved */
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mov ebx, [esi+KTHREAD_TRAP_FRAME]
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mov [ebp+KTRAP_FRAME_EDX], ebx
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/* Flush DR7 */
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and dword ptr [ebp+KTRAP_FRAME_DR7], 0
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/* Check if the thread was being debugged */
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test byte ptr [esi+KTHREAD_DEBUG_ACTIVE], 0xFF
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//jnz Dr_kss_a
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SharedCode:
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/* Set the thread's trap frame */
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mov [esi+KTHREAD_TRAP_FRAME], ebp
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/* Save DR registers if needed */
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//jnz Dr_FastCallDrSave
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/* Set the trap frame debug header */
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SET_TF_DEBUG_HEADER
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@ -208,7 +163,7 @@ PrevWasKernelMode:
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/* Enable interrupts */
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sti
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CheckValidCall:
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SharedCode:
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/*
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* Find out which table offset to use. Converts 0x1124 into 0x10.
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@ -389,14 +344,14 @@ KiBBTUnexpectedRange:
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mov [esi+KTHREAD_TRAP_FRAME], ebp
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/* Try the Call again */
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jmp CheckValidCall
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jmp SharedCode
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InvalidCall:
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/* Invalid System Call */
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mov eax, STATUS_INVALID_SYSTEM_SERVICE
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jmp KeReturnFromSystemCall
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#ifdef DBG
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InvalidIrql:
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/* Save current IRQL */
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@ -443,7 +398,6 @@ _KiServiceExit2:
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TRAP_EPILOG NotFromSystemCall, DoRestorePreviousMode, DoRestoreSegments, DoRestoreVolatiles, DoNotRestoreEverything
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.endfunc
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.globl _Kei386EoiHelper@0
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.func Kei386EoiHelper@0
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_Kei386EoiHelper@0:
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@ -535,7 +489,6 @@ NotUserMode:
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/* Exit through common routine */
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jmp _Kei386EoiHelper@0
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.globl _NtRaiseException@12
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_NtRaiseException@12:
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/* NOTE: We -must- be called by Zw* to have the right frame! */
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@ -581,7 +534,6 @@ _NtRaiseException@12:
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/* Restore debug registers too */
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jmp _KiServiceExit
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.globl _NtContinue@8
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_NtContinue@8:
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/* NOTE: We -must- be called by Zw* to have the right frame! */
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