return (TrapFrame->SegCs & MODE_MASK);
}
-//
-// Assembly exit stubs
-//
-VOID
-FORCEINLINE
-/* Do not mark this as DECLSPEC_NORETURN because possibly executing code follows it! */
-KiSystemCallReturn(IN PKTRAP_FRAME TrapFrame)
-{
- /* Restore nonvolatiles, EAX, and do a "jump" back to the kernel caller */
- __asm__ __volatile__
- (
- "movl %0, %%esp\n"
- "movl %c[b](%%esp), %%ebx\n"
- "movl %c[s](%%esp), %%esi\n"
- "movl %c[i](%%esp), %%edi\n"
- "movl %c[p](%%esp), %%ebp\n"
- "movl %c[a](%%esp), %%eax\n"
- "movl %c[e](%%esp), %%edx\n"
- "addl $%c[v],%%esp\n" /* A WHOLE *KERNEL* frame since we're not IRET'ing */
- "jmp *%%edx\n"
- ".globl _KiSystemCallExit2\n_KiSystemCallExit2:\n"
- :
- : "r"(TrapFrame),
- [b] "i"(KTRAP_FRAME_EBX),
- [s] "i"(KTRAP_FRAME_ESI),
- [i] "i"(KTRAP_FRAME_EDI),
- [p] "i"(KTRAP_FRAME_EBP),
- [a] "i"(KTRAP_FRAME_EAX),
- [e] "i"(KTRAP_FRAME_EIP),
- [v] "i"(KTRAP_FRAME_ESP)
- : "%esp"
- );
-}
-
-VOID
-FORCEINLINE
-DECLSPEC_NORETURN
-KiSystemCallTrapReturn(IN PKTRAP_FRAME TrapFrame)
-{
- /* Regular interrupt exit, but we only restore EAX as a volatile */
- __asm__ __volatile__
- (
- ".globl _KiSystemCallExit\n_KiSystemCallExit:\n"
- "movl %0, %%esp\n"
- "movl %c[b](%%esp), %%ebx\n"
- "movl %c[s](%%esp), %%esi\n"
- "movl %c[i](%%esp), %%edi\n"
- "movl %c[p](%%esp), %%ebp\n"
- "movl %c[a](%%esp), %%eax\n"
- "addl $%c[e],%%esp\n"
- "iret\n"
- :
- : "r"(TrapFrame),
- [b] "i"(KTRAP_FRAME_EBX),
- [s] "i"(KTRAP_FRAME_ESI),
- [i] "i"(KTRAP_FRAME_EDI),
- [p] "i"(KTRAP_FRAME_EBP),
- [a] "i"(KTRAP_FRAME_EAX),
- [e] "i"(KTRAP_FRAME_EIP)
- : "%esp"
- );
- UNREACHABLE;
-}
-
-VOID
-FORCEINLINE
-DECLSPEC_NORETURN
-KiSystemCallSysExitReturn(IN PKTRAP_FRAME TrapFrame)
-{
- /* Restore nonvolatiles, EAX, and do a SYSEXIT back to the user caller */
- __asm__ __volatile__
- (
- "movl %0, %%esp\n"
- "movl %c[s](%%esp), %%esi\n"
- "movl %c[b](%%esp), %%ebx\n"
- "movl %c[i](%%esp), %%edi\n"
- "movl %c[p](%%esp), %%ebp\n"
- "movl %c[a](%%esp), %%eax\n"
- "movl %c[e](%%esp), %%edx\n" /* SYSEXIT says EIP in EDX */
- "movl %c[x](%%esp), %%ecx\n" /* SYSEXIT says ESP in ECX */
- "addl $%c[v],%%esp\n" /* A WHOLE *USER* frame since we're not IRET'ing */
- "sti\nsysexit\n"
- :
- : "r"(TrapFrame),
- [b] "i"(KTRAP_FRAME_EBX),
- [s] "i"(KTRAP_FRAME_ESI),
- [i] "i"(KTRAP_FRAME_EDI),
- [p] "i"(KTRAP_FRAME_EBP),
- [a] "i"(KTRAP_FRAME_EAX),
- [e] "i"(KTRAP_FRAME_EIP),
- [x] "i"(KTRAP_FRAME_ESP),
- [v] "i"(KTRAP_FRAME_V86_ES)
- : "%esp"
- );
- UNREACHABLE;
-}
-
-VOID
-FORCEINLINE
-DECLSPEC_NORETURN
-KiTrapReturn(IN PKTRAP_FRAME TrapFrame)
-{
- /* Regular interrupt exit */
- __asm__ __volatile__
- (
- "movl %0, %%esp\n"
- "movl %c[a](%%esp), %%eax\n"
- "movl %c[b](%%esp), %%ebx\n"
- "movl %c[c](%%esp), %%ecx\n"
- "movl %c[d](%%esp), %%edx\n"
- "movl %c[s](%%esp), %%esi\n"
- "movl %c[i](%%esp), %%edi\n"
- "movl %c[p](%%esp), %%ebp\n"
- "addl $%c[e],%%esp\n"
- "iret\n"
- :
- : "r"(TrapFrame),
- [a] "i"(KTRAP_FRAME_EAX),
- [b] "i"(KTRAP_FRAME_EBX),
- [c] "i"(KTRAP_FRAME_ECX),
- [d] "i"(KTRAP_FRAME_EDX),
- [s] "i"(KTRAP_FRAME_ESI),
- [i] "i"(KTRAP_FRAME_EDI),
- [p] "i"(KTRAP_FRAME_EBP),
- [e] "i"(KTRAP_FRAME_EIP)
- : "%esp"
- );
- UNREACHABLE;
-}
-
-VOID
-FORCEINLINE
-DECLSPEC_NORETURN
-KiDirectTrapReturn(IN PKTRAP_FRAME TrapFrame)
-{
- /* Regular interrupt exit but we're not restoring any registers */
- __asm__ __volatile__
- (
- "movl %0, %%esp\n"
- "addl $%c[e],%%esp\n"
- "iret\n"
- :
- : "r"(TrapFrame),
- [e] "i"(KTRAP_FRAME_EIP)
- : "%esp"
- );
- UNREACHABLE;
-}
-
-VOID
-FORCEINLINE
-DECLSPEC_NORETURN
-KiCallReturn(IN PKTRAP_FRAME TrapFrame)
-{
- /* Pops a trap frame out of the stack but returns with RET instead of IRET */
- __asm__ __volatile__
- (
- "movl %0, %%esp\n"
- "movl %c[b](%%esp), %%ebx\n"
- "movl %c[s](%%esp), %%esi\n"
- "movl %c[i](%%esp), %%edi\n"
- "movl %c[p](%%esp), %%ebp\n"
- "addl $%c[e],%%esp\n"
- "ret\n"
- :
- : "r"(TrapFrame),
- [b] "i"(KTRAP_FRAME_EBX),
- [s] "i"(KTRAP_FRAME_ESI),
- [i] "i"(KTRAP_FRAME_EDI),
- [p] "i"(KTRAP_FRAME_EBP),
- [e] "i"(KTRAP_FRAME_EIP)
- : "%esp"
- );
- UNREACHABLE;
-}
-
-VOID
-FORCEINLINE
-DECLSPEC_NORETURN
-KiEditedTrapReturn(IN PKTRAP_FRAME TrapFrame)
-{
- /* Regular interrupt exit */
- __asm__ __volatile__
- (
- "movl %0, %%esp\n"
- "movl %c[a](%%esp), %%eax\n"
- "movl %c[b](%%esp), %%ebx\n"
- "movl %c[c](%%esp), %%ecx\n"
- "movl %c[d](%%esp), %%edx\n"
- "movl %c[s](%%esp), %%esi\n"
- "movl %c[i](%%esp), %%edi\n"
- "movl %c[p](%%esp), %%ebp\n"
- "addl $%c[e],%%esp\n"
- "movl (%%esp), %%esp\n"
- "iret\n"
- :
- : "r"(TrapFrame),
- [a] "i"(KTRAP_FRAME_EAX),
- [b] "i"(KTRAP_FRAME_EBX),
- [c] "i"(KTRAP_FRAME_ECX),
- [d] "i"(KTRAP_FRAME_EDX),
- [s] "i"(KTRAP_FRAME_ESI),
- [i] "i"(KTRAP_FRAME_EDI),
- [p] "i"(KTRAP_FRAME_EBP),
- [e] "i"(KTRAP_FRAME_ERROR_CODE) /* We *WANT* the error code since ESP is there! */
- : "%esp"
- );
- UNREACHABLE;
-}
-
//
// "BOP" code used by VDM and V8086 Mode
//
TrapFrame->SegEs = Es;
}
+//
+// Generates an Exit Epilog Stub for the given name
+//
+#define KI_FUNCTION_CALL 0x1
+#define KI_EDITED_FRAME 0x2
+#define KI_DIRECT_EXIT 0x4
+#define KI_FAST_SYSTEM_CALL_EXIT 0x8
+#define KI_SYSTEM_CALL_EXIT 0x10
+#define KI_SYSTEM_CALL_JUMP 0x20
+#define KiTrapExitStub(x, y) VOID FORCEINLINE DECLSPEC_NORETURN x(IN PKTRAP_FRAME TrapFrame) { KiTrapExit(TrapFrame, y); UNREACHABLE; }
+#define KiTrapExitStub2(x, y) VOID FORCEINLINE x(IN PKTRAP_FRAME TrapFrame) { KiTrapExit(TrapFrame, y); }
+
+//
+// How volatiles will be restored
+//
+#define KI_EAX_NO_VOLATILES 0x0
+#define KI_EAX_ONLY 0x1
+#define KI_ALL_VOLATILES 0x2
+
+//
+// Exit mechanism to use
+//
+#define KI_EXIT_IRET 0x0
+#define KI_EXIT_SYSEXIT 0x1
+#define KI_EXIT_JMP 0x2
+#define KI_EXIT_RET 0x3
+
+//
+// Master Trap Epilog
+//
+VOID
+FORCEINLINE
+KiTrapExit(IN PKTRAP_FRAME TrapFrame,
+ IN ULONG Flags)
+{
+ ULONG FrameSize = FIELD_OFFSET(KTRAP_FRAME, Eip);
+ ULONG ExitMechanism = KI_EXIT_IRET, Volatiles = KI_ALL_VOLATILES, NonVolatiles = TRUE;
+ ULONG EcxField = FIELD_OFFSET(KTRAP_FRAME, Ecx), EdxField = FIELD_OFFSET(KTRAP_FRAME, Edx);
+
+ /* System call exit needs a special label */
+ if (Flags & KI_SYSTEM_CALL_EXIT) __asm__ __volatile__
+ (
+ ".globl _KiSystemCallExit\n_KiSystemCallExit:\n"
+ );
+
+ /* Start by making the trap frame equal to the stack */
+ __asm__ __volatile__
+ (
+ "movl %0, %%esp\n"
+ :
+ : "r"(TrapFrame)
+ : "%esp"
+ );
+
+ /* Check what kind of trap frame this trap requires */
+ if (Flags & KI_FUNCTION_CALL)
+ {
+ /* These calls have an EIP on the stack they need */
+ ExitMechanism = KI_EXIT_RET;
+ Volatiles = FALSE;
+ }
+ else if (Flags & KI_EDITED_FRAME)
+ {
+ /* Edited frames store a new ESP in the error code field */
+ FrameSize = FIELD_OFFSET(KTRAP_FRAME, ErrCode);
+ }
+ else if (Flags & KI_DIRECT_EXIT)
+ {
+ /* Exits directly without restoring anything, interrupt frame on stack */
+ NonVolatiles = Volatiles = FALSE;
+ }
+ else if (Flags & KI_FAST_SYSTEM_CALL_EXIT)
+ {
+ /* We have a fake interrupt stack with a ring transition */
+ FrameSize = FIELD_OFFSET(KTRAP_FRAME, V86Es);
+ ExitMechanism = KI_EXIT_SYSEXIT;
+
+ /* SYSEXIT wants EIP in EDX and ESP in ECX */
+ EcxField = FIELD_OFFSET(KTRAP_FRAME, HardwareEsp);
+ EdxField = FIELD_OFFSET(KTRAP_FRAME, Eip);
+ }
+ else if (Flags & KI_SYSTEM_CALL_EXIT)
+ {
+ /* Only restore EAX */
+ NonVolatiles = KI_EAX_ONLY;
+ }
+ else if (Flags & KI_SYSTEM_CALL_JUMP)
+ {
+ /* We have a fake interrupt stack with no ring transition */
+ FrameSize = FIELD_OFFSET(KTRAP_FRAME, HardwareEsp);
+ NonVolatiles = KI_EAX_ONLY;
+ ExitMechanism = KI_EXIT_JMP;
+ }
+
+ /* Restore the non volatiles */
+ if (NonVolatiles) __asm__ __volatile__
+ (
+ "movl %c[b](%%esp), %%ebx\n"
+ "movl %c[s](%%esp), %%esi\n"
+ "movl %c[i](%%esp), %%edi\n"
+ "movl %c[p](%%esp), %%ebp\n"
+ :
+ : [b] "i"(FIELD_OFFSET(KTRAP_FRAME, Ebx)),
+ [s] "i"(FIELD_OFFSET(KTRAP_FRAME, Esi)),
+ [i] "i"(FIELD_OFFSET(KTRAP_FRAME, Edi)),
+ [p] "i"(FIELD_OFFSET(KTRAP_FRAME, Ebp))
+ : "%esp"
+ );
+
+ /* Restore EAX if volatiles must be restored */
+ if (Volatiles) __asm__ __volatile__
+ (
+ "movl %c[a](%%esp), %%eax\n":: [a] "i"(FIELD_OFFSET(KTRAP_FRAME, Eax)) : "%esp"
+ );
+
+ /* Restore the other volatiles if needed */
+ if (Volatiles == KI_ALL_VOLATILES) __asm__ __volatile__
+ (
+ "movl %c[c](%%esp), %%ecx\n"
+ "movl %c[d](%%esp), %%edx\n"
+ :
+ : [c] "i"(EcxField),
+ [d] "i"(EdxField)
+ : "%esp"
+ );
+
+ /* Ring 0 system calls jump back to EDX */
+ if (Flags & KI_SYSTEM_CALL_JUMP) __asm__ __volatile__
+ (
+ "movl %c[d](%%esp), %%edx\n":: [d] "i"(FIELD_OFFSET(KTRAP_FRAME, Eip)) : "%esp"
+ );
+
+ /* Now destroy the trap frame on the stack */
+ __asm__ __volatile__ ("addl $%c[e],%%esp\n":: [e] "i"(FrameSize) : "%esp");
+
+ /* Edited traps need to change to a new ESP */
+ if (Flags & KI_EDITED_FRAME) __asm__ __volatile__ ("movl (%%esp), %%esp\n":::"%esp");
+
+ /* Check the exit mechanism and apply it */
+ if (ExitMechanism == KI_EXIT_RET) __asm__ __volatile__("ret\n"::: "%esp");
+ else if (ExitMechanism == KI_EXIT_IRET) __asm__ __volatile__("iret\n"::: "%esp");
+ else if (ExitMechanism == KI_EXIT_JMP) __asm__ __volatile__("jmp *%%edx\n.globl _KiSystemCallExit2\n_KiSystemCallExit2:\n"::: "%esp");
+ else if (ExitMechanism == KI_EXIT_SYSEXIT) __asm__ __volatile__("sti\nsysexit\n"::: "%esp");
+}
+
+//
+// All the specific trap epilog stubs
+//
+KiTrapExitStub (KiTrapReturn, 0);
+KiTrapExitStub (KiDirectTrapReturn, KI_DIRECT_EXIT);
+KiTrapExitStub (KiCallReturn, KI_FUNCTION_CALL);
+KiTrapExitStub (KiEditedTrapReturn, KI_EDITED_FRAME);
+KiTrapExitStub2(KiSystemCallReturn, KI_SYSTEM_CALL_JUMP);
+KiTrapExitStub (KiSystemCallSysExitReturn, KI_FAST_SYSTEM_CALL_EXIT);
+KiTrapExitStub (KiSystemCallTrapReturn, KI_SYSTEM_CALL_EXIT);
+
//
// Generic Exit Routine
//
projects / reactos.git / commitdiff