InternalSwitchStack.c

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#include "BaseLibInternals.h"
 
VOID
EFIAPI
InternalSwitchStack (
  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
  IN      VOID                      *Context1    OPTIONAL,
  IN      VOID                      *Context2    OPTIONAL,
  IN      VOID                      *NewStack,
  IN      VA_LIST                   Marker
  )
{
  BASE_LIBRARY_JUMP_BUFFER  JumpBuffer;
 
  JumpBuffer.Eip               = (UINTN)EntryPoint;
  JumpBuffer.Esp               = (UINTN)NewStack - sizeof (VOID *);
  JumpBuffer.Esp              -= sizeof (Context1) + sizeof (Context2);
  ((VOID **)JumpBuffer.Esp)[1] = Context1;
  ((VOID **)JumpBuffer.Esp)[2] = Context2;
 
  LongJump (&JumpBuffer, (UINTN)-1);
}