mirror of
https://github.com/reactos/reactos.git
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cleanup/reformat syscall code, save return value as soon as possible so that eax is freed up, which also simplifies the implementation of KiAfterSystemCallHook(), also removes a couple redundant instructions.
svn path=/trunk/; revision=9955
This commit is contained in:
Royce Mitchell III
parent
aa33e15965
commit
209e1d7692
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* $Id: syscall.S,v 1.14 2004/04/07 15:35:14 ekohl Exp $
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/* $Id: syscall.S,v 1.15 2004/07/01 01:52:37 royce Exp $
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*
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* FILE: ntoskrnl/hal/x86/syscall.s
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* PURPOSE: 2E trap handler
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@ -28,6 +28,7 @@
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#include <ddk/status.h>
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#include <internal/i386/segment.h>
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#include <internal/ps.h>
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#include <internal/i386/ke.h>
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#include <roscfg.h>
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#define KernelMode (0)
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@ -41,250 +42,266 @@
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.globl _interrupt_handler2e
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_interrupt_handler2e:
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/* Construct a trap frame on the stack */
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/* Construct a trap frame on the stack */
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/* Error code */
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pushl $0
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pushl %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %fs
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/* Load PCR selector into fs */
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movl $PCR_SELECTOR, %ebx
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movl %ebx, %fs
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/* Error code */
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pushl $0
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pushl %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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pushl %fs
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/* Load PCR selector into fs */
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movl $PCR_SELECTOR, %ebx
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movl %ebx, %fs
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/* Save the old exception list */
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movl %fs:KPCR_EXCEPTION_LIST, %ebx
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pushl %ebx
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/* Set the exception handler chain terminator */
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movl $0xffffffff, %fs:KPCR_EXCEPTION_LIST
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/* Get a pointer to the current thread */
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movl %fs:KPCR_CURRENT_THREAD, %esi
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/* Save the old previous mode */
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movl $0, %ebx
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movb %ss:KTHREAD_PREVIOUS_MODE(%esi), %bl
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pushl %ebx
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/* Set the new previous mode based on the saved CS selector */
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movl 0x24(%esp), %ebx
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andl $0x0000FFFF, %ebx
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cmpl $KERNEL_CS, %ebx
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jne L1
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movb $KernelMode, %ss:KTHREAD_PREVIOUS_MODE(%esi)
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jmp L3
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/* Save the old exception list */
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movl %fs:KPCR_EXCEPTION_LIST, %ebx
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pushl %ebx
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/* Set the exception handler chain terminator */
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movl $0xffffffff, %fs:KPCR_EXCEPTION_LIST
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/* Get a pointer to the current thread */
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movl %fs:KPCR_CURRENT_THREAD, %esi
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/* Save the old previous mode */
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movl $0, %ebx
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movb %ss:KTHREAD_PREVIOUS_MODE(%esi), %bl
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pushl %ebx
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/* Set the new previous mode based on the saved CS selector */
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movl 0x24(%esp), %ebx
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andl $0x0000FFFF, %ebx
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cmpl $KERNEL_CS, %ebx
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jne L1
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movb $KernelMode, %ss:KTHREAD_PREVIOUS_MODE(%esi)
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jmp L3
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L1:
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movb $UserMode, %ss:KTHREAD_PREVIOUS_MODE(%esi)
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movb $UserMode, %ss:KTHREAD_PREVIOUS_MODE(%esi)
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L3:
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/* Save other registers */
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pushl %eax
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pushl %ecx
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pushl %edx
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pushl %ds
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pushl %es
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pushl %gs
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pushl $0 /* DR7 */
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pushl $0 /* DR6 */
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pushl $0 /* DR3 */
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pushl $0 /* DR2 */
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pushl $0 /* DR1 */
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pushl $0 /* DR0 */
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pushl $0 /* XXX: TempESP */
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pushl $0 /* XXX: TempCS */
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pushl $0 /* XXX: DebugPointer */
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pushl $0 /* XXX: DebugArgMark */
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/* Save other registers */
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pushl %eax
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pushl %ecx
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pushl %edx
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pushl %ds
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pushl %es
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pushl %gs
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pushl $0 /* DR7 */
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pushl $0 /* DR6 */
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pushl $0 /* DR3 */
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pushl $0 /* DR2 */
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pushl $0 /* DR1 */
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pushl $0 /* DR0 */
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pushl $0 /* XXX: TempESP */
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pushl $0 /* XXX: TempCS */
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pushl $0 /* XXX: DebugPointer */
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pushl $0 /* XXX: DebugArgMark */
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#ifdef DBG
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/* Trick gdb 6 into backtracing over the system call */
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movl 4(%ebp), %ebx
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pushl %ebx /* DebugEIP */
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movl (%ebp), %ebx
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pushl %ebx /* DebugEBP */
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/* Trick gdb 6 into backtracing over the system call */
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movl 4(%ebp), %ebx
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pushl %ebx /* DebugEIP */
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movl (%ebp), %ebx
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pushl %ebx /* DebugEBP */
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#else
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movl 0x60(%esp), %ebx
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pushl %ebx /* DebugEIP */
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pushl %ebp /* DebugEBP */
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movl 0x60(%esp), %ebx
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pushl %ebx /* DebugEIP */
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pushl %ebp /* DebugEBP */
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#endif
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/* Load the segment registers */
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movl $KERNEL_DS, %ebx
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movl %ebx, %ds
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movl %ebx, %es
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movl %ebx, %gs
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/* Load the segment registers */
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movl $KERNEL_DS, %ebx
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movl %ebx, %ds
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movl %ebx, %es
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movl %ebx, %gs
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/*
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* Save the old trap frame pointer over where we would save the EDX
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* register.
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*/
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movl KTHREAD_TRAP_FRAME(%esi), %ebx
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movl %ebx, 0x3C(%esp)
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/* Save a pointer to the trap frame in the TCB */
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movl %esp, KTHREAD_TRAP_FRAME(%esi)
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/* Set ES to kernel segment */
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movw $KERNEL_DS,%bx
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movw %bx,%es
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/*
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* Save the old trap frame pointer over where we would save the EDX
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* register.
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*/
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movl KTHREAD_TRAP_FRAME(%esi), %ebx
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movl %ebx, KTRAP_FRAME_EDX(%esp)
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/* Allocate new Kernel stack frame */
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movl %esp,%ebp
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/* Allocate new Kernel stack frame */
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movl %esp,%ebp
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/* Users's current stack frame pointer is source */
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movl %edx,%esi
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/* Save a pointer to the trap frame in the TCB */
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movl %ebp, KTHREAD_TRAP_FRAME(%esi)
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/* Determine system service table to use */
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cmpl $0x0fff, %eax
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ja new_useShadowTable
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/* Set ES to kernel segment */
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movw $KERNEL_DS,%bx
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movw %bx,%es
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/* Check to see if EAX is valid/inrange */
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cmpl %es:_KeServiceDescriptorTable + 8, %eax
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jbe new_serviceInRange
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movl $STATUS_INVALID_SYSTEM_SERVICE, %eax
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jmp KeReturnFromSystemCall
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/* Users's current stack frame pointer is source */
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movl %edx,%esi
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/* Determine system service table to use */
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cmpl $0x0fff, %eax
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ja new_useShadowTable
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/* Check to see if EAX is valid/inrange */
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cmpl %es:_KeServiceDescriptorTable + 8, %eax
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jbe new_serviceInRange
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movl $STATUS_INVALID_SYSTEM_SERVICE, %eax
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movl %eax, KTRAP_FRAME_EAX(%ebp) /* save our return value in PKTRAP_FRAME->Eax */
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jmp KeReturnFromSystemCall
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new_serviceInRange:
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#ifdef DBG
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/* GDB thinks the function starts here and
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wants a standard prolog, so let's give it */
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pushl %ebp
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movl %esp,%ebp
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popl %ebp
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/* GDB thinks the function starts here and
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wants a standard prolog, so let's give it */
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pushl %ebp
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movl %esp,%ebp
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popl %ebp
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#endif
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/* Allocate room for argument list from kernel stack */
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movl %es:_KeServiceDescriptorTable + 12, %ecx
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movb %es:(%ecx, %eax), %cl
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movzx %cl, %ecx
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subl %ecx, %esp
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/* Allocate room for argument list from kernel stack */
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movl %es:_KeServiceDescriptorTable + 12, %ecx
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movb %es:(%ecx, %eax), %cl
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movzx %cl, %ecx
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subl %ecx, %esp
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/* Copy the arguments from the user stack to the kernel stack */
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movl %esp,%edi
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cld
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rep movsb
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/* Copy the arguments from the user stack to the kernel stack */
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movl %esp,%edi
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cld
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rep movsb
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/* DS is now also kernel segment */
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movw %bx, %ds
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/* Call system call hook */
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pushl %eax
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call _KiSystemCallHook
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popl %eax
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/* DS is now also kernel segment */
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movw %bx, %ds
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/* Make the system service call */
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movl %es:_KeServiceDescriptorTable, %ecx
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movl %es:(%ecx, %eax, 4), %eax
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call *%eax
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/* Call system call hook */
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pushl %eax
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call _KiSystemCallHook
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popl %eax
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/* Make the system service call */
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movl %es:_KeServiceDescriptorTable, %ecx
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movl %es:(%ecx, %eax, 4), %eax
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call *%eax
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movl %eax, KTRAP_FRAME_EAX(%ebp) /* save our return value in PKTRAP_FRAME->Eax */
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#if CHECKED
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/* Bump Service Counter */
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/* Bump Service Counter */
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#endif
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/* Deallocate the kernel stack frame */
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movl %ebp,%esp
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/* Call the post system call hook and deliver any pending APCs */
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pushl %ebp
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pushl %eax
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call _KiAfterSystemCallHook
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addl $8,%esp
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jmp KeReturnFromSystemCall
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jmp KeDeallocateStackAndReturnFromSystemCallWithHook
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new_useShadowTable:
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subl $0x1000, %eax
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subl $0x1000, %eax
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/* Check to see if EAX is valid/inrange */
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cmpl %es:_KeServiceDescriptorTableShadow + 24, %eax
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jbe new_shadowServiceInRange
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movl $STATUS_INVALID_SYSTEM_SERVICE, %eax
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jmp KeReturnFromSystemCall
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/* Check to see if EAX is valid/inrange */
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cmpl %es:_KeServiceDescriptorTableShadow + 24, %eax
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jbe new_shadowServiceInRange
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movl $STATUS_INVALID_SYSTEM_SERVICE, %eax
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movl %eax, KTRAP_FRAME_EAX(%ebp) /* save our return value in PKTRAP_FRAME->Eax */
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jmp KeReturnFromSystemCall
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new_shadowServiceInRange:
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#ifdef DBG
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/* GDB thinks the function starts here and
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wants a standard prolog, so let's give it */
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pushl %ebp
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movl %esp,%ebp
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popl %ebp
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/* GDB thinks the function starts here and
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wants a standard prolog, so let's give it */
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pushl %ebp
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movl %esp,%ebp
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popl %ebp
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#endif
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/* Allocate room for argument list from kernel stack */
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movl %es:_KeServiceDescriptorTableShadow + 28, %ecx
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movb %es:(%ecx, %eax), %cl
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movzx %cl, %ecx
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subl %ecx, %esp
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/* Allocate room for argument list from kernel stack */
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movl %es:_KeServiceDescriptorTableShadow + 28, %ecx
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movb %es:(%ecx, %eax), %cl
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movzx %cl, %ecx
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subl %ecx, %esp
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/* Copy the arguments from the user stack to the kernel stack */
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movl %esp,%edi
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cld
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rep movsb
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/* Copy the arguments from the user stack to the kernel stack */
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movl %esp,%edi
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cld
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rep movsb
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/* DS is now also kernel segment */
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movw %bx,%ds
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/* DS is now also kernel segment */
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movw %bx,%ds
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/* Call system call hook */
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// pushl %eax
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// call _KiSystemCallHook
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// popl %eax
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/* Call system call hook */
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// pushl %eax
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// call _KiSystemCallHook
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// popl %eax
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/* Call service check routine */
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pushl %eax
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call _KiServiceCheck
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popl %eax
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/* Make the system service call */
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movl %es:_KeServiceDescriptorTableShadow + 16, %ecx
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movl %es:(%ecx, %eax, 4), %eax
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call *%eax
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/* Call service check routine */
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pushl %eax
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call _KiServiceCheck
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popl %eax
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/* Make the system service call */
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movl %es:_KeServiceDescriptorTableShadow + 16, %ecx
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movl %es:(%ecx, %eax, 4), %eax
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call *%eax
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movl %eax, KTRAP_FRAME_EAX(%ebp) /* save our return value in PKTRAP_FRAME->Eax */
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#if CHECKED
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/* Bump Service Counter */
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/* Bump Service Counter */
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#endif
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/* Deallocate the kernel stack frame */
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movl %ebp,%esp
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KeDeallocateStackAndReturnFromSystemCallWithHook:
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/* Deallocate the kernel stack frame */
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movl %ebp,%esp
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KeReturnFromSystemCallWithHook:
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/* Call the post system call hook and deliver any pending APCs */
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pushl %esp
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pushl %eax
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call _KiAfterSystemCallHook
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addl $8,%esp
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KeReturnFromSystemCallWithHook:
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/* Call the post system call hook and deliver any pending APCs */
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pushl %esp
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call _KiAfterSystemCallHook
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addl $4,%esp
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KeReturnFromSystemCall:
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/* Restore the user context */
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/* Get a pointer to the current thread */
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movl %fs:0x124, %esi
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/* Restore the old trap frame pointer */
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movl 0x3c(%esp), %ebx
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movl %ebx, KTHREAD_TRAP_FRAME(%esi)
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/* Skip debug information and unsaved registers */
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addl $0x30, %esp
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popl %gs
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popl %es
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popl %ds
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popl %edx
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popl %ecx
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addl $0x4, %esp /* Don't restore eax */
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/* Restore the old previous mode */
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popl %ebx
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movb %bl, %ss:KTHREAD_PREVIOUS_MODE(%esi)
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/* Restore the user context */
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/* Get a pointer to the current thread */
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movl %fs:0x124, %esi
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/* Restore the old exception handler list */
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popl %ebx
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movl %ebx, %fs:KPCR_EXCEPTION_LIST
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popl %fs
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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addl $0x4, %esp /* Ignore error code */
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iret
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/* Restore the old trap frame pointer */
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movl KTRAP_FRAME_EDX(%esp), %ebx
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movl %ebx, KTHREAD_TRAP_FRAME(%esi)
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KiRosTrapReturn:
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/* Skip debug information and unsaved registers */
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addl $0x30, %esp
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popl %gs
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popl %es
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popl %ds
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popl %edx
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popl %ecx
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popl %eax
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/* Restore the old previous mode */
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popl %ebx
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movb %bl, %ss:KTHREAD_PREVIOUS_MODE(%esi)
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/* Restore the old exception handler list */
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popl %ebx
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movl %ebx, %fs:KPCR_EXCEPTION_LIST
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popl %fs
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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addl $0x4, %esp /* Ignore error code */
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iret
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/* R3: NOTE: This is part of my in-progress attempt at correcting NtContinue
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* It is not being called, yet...
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*/
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.globl @KeRosTrapReturn@8
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@KeRosTrapReturn@8:
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/* Call the post system call hook and deliver any pending APCs */
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pushl %esp
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call _KiAfterSystemCallHook
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addl $4,%esp
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/* Restore the user context */
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/* Get a pointer to the current thread */
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movl %fs:0x124, %esi
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/* Restore the old trap frame pointer */
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movl %edx, KTHREAD_TRAP_FRAME(%esi)
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/* point %esp to the trap frame to restore */
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movl %ecx, %esp
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jmp KiRosTrapReturn;
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@ -1,4 +1,4 @@
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/* $Id: usercall.c,v 1.26 2004/06/23 22:32:24 ion Exp $
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/* $Id: usercall.c,v 1.27 2004/07/01 01:52:37 royce Exp $
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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@ -26,7 +26,8 @@
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|||
|
||||
/* FUNCTIONS *****************************************************************/
|
||||
|
||||
VOID KiSystemCallHook(ULONG Nr, ...)
|
||||
VOID
|
||||
KiSystemCallHook(ULONG Nr, ...)
|
||||
{
|
||||
#if 0
|
||||
va_list ap;
|
||||
|
|
@ -46,7 +47,8 @@ VOID KiSystemCallHook(ULONG Nr, ...)
|
|||
#endif
|
||||
}
|
||||
|
||||
ULONG KiAfterSystemCallHook(ULONG NtStatus, PKTRAP_FRAME TrapFrame)
|
||||
VOID
|
||||
KiAfterSystemCallHook(PKTRAP_FRAME TrapFrame)
|
||||
{
|
||||
if (KeGetCurrentThread()->Alerted[1] != 0 && TrapFrame->Cs != KERNEL_CS)
|
||||
{
|
||||
|
|
@ -56,11 +58,11 @@ ULONG KiAfterSystemCallHook(ULONG NtStatus, PKTRAP_FRAME TrapFrame)
|
|||
{
|
||||
KiDeliverUserApc(TrapFrame);
|
||||
}
|
||||
return(NtStatus);
|
||||
}
|
||||
|
||||
|
||||
VOID KiServiceCheck (ULONG Nr)
|
||||
VOID
|
||||
KiServiceCheck (ULONG Nr)
|
||||
{
|
||||
PETHREAD Thread;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue