[ros-diffs] 04/05: [HAL] Eliminate tail calls from HalpDispatchInterrupt[2]. CORE-14076

[Thomas Faber]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=b4453242f7d7e71329b05…

commit b4453242f7d7e71329b05b721066f11465add86e
Author:     Thomas Faber <thomas.faber(a)reactos.org>
AuthorDate: Sun Feb 18 12:50:54 2018 +0100
Commit:     Thomas Faber <thomas.faber(a)reactos.org>
CommitDate: Sun Feb 18 13:06:42 2018 +0100

    [HAL] Eliminate tail calls from HalpDispatchInterrupt[2]. CORE-14076
---
 hal/halx86/include/halp.h |  2 +-
 hal/halx86/up/pic.S       | 24 ++++++++++++++++++++++++
 hal/halx86/up/pic.c       |  8 +++++---
 3 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/hal/halx86/include/halp.h b/hal/halx86/include/halp.h
index 079b1adb6d..ed430910fd 100644
--- a/hal/halx86/include/halp.h
+++ b/hal/halx86/include/halp.h
@@ -576,7 +576,7 @@ HalpEnableInterruptHandler(IN UCHAR Flags,
 VOID NTAPI HalpInitializePICs(IN BOOLEAN EnableInterrupts);
 VOID __cdecl HalpApcInterrupt(VOID);
 VOID __cdecl HalpDispatchInterrupt(VOID);
-VOID __cdecl HalpDispatchInterrupt2(VOID);
+PHAL_SW_INTERRUPT_HANDLER __cdecl HalpDispatchInterrupt2(VOID);
 DECLSPEC_NORETURN VOID FASTCALL HalpApcInterrupt2ndEntry(IN PKTRAP_FRAME TrapFrame);
 DECLSPEC_NORETURN VOID FASTCALL HalpDispatchInterrupt2ndEntry(IN PKTRAP_FRAME
TrapFrame);
 
diff --git a/hal/halx86/up/pic.S b/hal/halx86/up/pic.S
index 8211718585..1076bc5711 100644
--- a/hal/halx86/up/pic.S
+++ b/hal/halx86/up/pic.S
@@ -48,8 +48,32 @@ WrapperName&_CallIntHandler:
 .ENDP
 ENDM
 
+MACRO(DEFINE_INTERRUPT_WRAPPER, WrapperName, HandlerName)
+EXTERN _&HandlerName:PROC
+PUBLIC _&WrapperName
+.PROC _&WrapperName
+    FPO 0, 0, 0, 0, 0, FRAME_FPO
+
+    /* Call the C function */
+    call _&HandlerName
+
+    /* Check if we got a pointer back */
+    test eax, eax
+    jnz WrapperName&_CallIntHandler
+
+    /* No? Just return */
+    ret
+
+WrapperName&_CallIntHandler:
+    /* Optimize the tail call to avoid stack overflow */
+    jmp eax
+.ENDP
+ENDM
+
 
 DEFINE_END_INTERRUPT_WRAPPER HalpEndSoftwareInterrupt, HalpEndSoftwareInterrupt2
 DEFINE_END_INTERRUPT_WRAPPER HalEndSystemInterrupt, HalEndSystemInterrupt2
 
+DEFINE_INTERRUPT_WRAPPER HalpDispatchInterrupt, HalpDispatchInterrupt2
+
 END
diff --git a/hal/halx86/up/pic.c b/hal/halx86/up/pic.c
index 2d1d6d10e3..6f68f1c5d0 100644
--- a/hal/halx86/up/pic.c
+++ b/hal/halx86/up/pic.c
@@ -382,7 +382,7 @@ PHAL_SW_INTERRUPT_HANDLER SWInterruptHandlerTable[20] =
 {
     (PHAL_SW_INTERRUPT_HANDLER)KiUnexpectedInterrupt,
     HalpApcInterrupt,
-    HalpDispatchInterrupt2,
+    HalpDispatchInterrupt,
     (PHAL_SW_INTERRUPT_HANDLER)KiUnexpectedInterrupt,
     HalpHardwareInterrupt0,
     HalpHardwareInterrupt1,
@@ -1297,7 +1297,7 @@ HalpDispatchInterrupt2ndEntry(IN PKTRAP_FRAME TrapFrame)
     KiEoiHelper(TrapFrame);
 }
 
-VOID
+PHAL_SW_INTERRUPT_HANDLER
 __cdecl
 HalpDispatchInterrupt2(VOID)
 {
@@ -1330,8 +1330,10 @@ HalpDispatchInterrupt2(VOID)
         }
 
         /* Now handle pending interrupt */
-        SWInterruptHandlerTable[PendingIrql]();
+        return SWInterruptHandlerTable[PendingIrql];
     }
+
+    return NULL;
 }
 
 #else