This commit was manufactured by cvs2svn to create branch 'captive'.

[reactos.git] / lib / kernel32 / thread / i386 / fiber.S

diff --git a/lib/kernel32/thread/i386/fiber.S b/lib/kernel32/thread/i386/fiber.S
new file mode 100644 (file)
index 0000000..983e8a2
--- /dev/null
+++ b/lib/kernel32/thread/i386/fiber.S
@@ -0,0 +1,94 @@
+/* $Id$
+ *
+ * COPYRIGHT:  See COPYING in the top level directory
+ * PROJECT:    ReactOS system libraries
+ * FILE:       lib/kernel32/thread/i386/fiber.S
+ * PURPOSE:    Fiber context switch code for the x86 architecture
+ * PROGRAMMER: KJK::Hyperion <noog@libero.it>
+ *
+ * UPDATE HISTORY:
+ *             28/05/2003 - created
+ *
+ */
+
+.extern _DbgPrint
+
+.globl _SwitchToFiber@4
+
+ErrStr:
+ .ascii \
+"(KERNEL32:" __FILE__ ") Saving and restoring the floating point context \
+currently unimplemented\n\0"
+
+_SwitchToFiber@4:
+
+ movl %fs:0x18, %ecx           /* Teb = NtCurrentTeb() */
+
+ /* get the current fiber */
+ movl 0x10(%ecx), %eax         /* Fiber = Teb->Tib.Fib.FiberData */
+
+ /* store the volatile context of the current fiber */
+ movl 0x0(%ecx),   %edx
+ movl %edx,        0x4(%eax)   /* Fiber->ExceptionList = Teb->ExceptionList */
+ movl 0x4(%ecx),   %edx
+ movl %edx,        0x8(%eax)   /* Fiber->StackBase = Teb->StackBase */
+ movl 0x8(%ecx),   %edx
+ movl %edx,        0xC(%eax)   /* Fiber->StackLimit = Teb->StackLimit */
+ movl 0xE0C(%ecx), %edx
+ movl %edx,        0x10(%eax)  /* Fiber->StackBottom = Teb->DeallocationStack */
+ movl 0x0(%esp),   %edx
+ movl %edx,        0x18(%eax)  /* Fiber->Eip = [esp + 0] */
+ movl %esp,        %edx
+ addl $0x8,        %edx        
+ movl %edx,        0x1C(%eax)  /* Fiber->Esp = esp + 8 */
+ movl %ebp,        0x20(%eax)  /* Fiber->Ebp = ebp */
+ movl %ebx,        0x24(%eax)  /* Fiber->Ebx = ebx */
+ movl %esi,        0x28(%eax)  /* Fiber->Esi = edi */
+ movl %edi,        0x2C(%eax)  /* Fiber->Edi = esi */
+
+ testl $1, 0x14(%eax)
+ jz l_NoFloatSave
+ 
+ /* save the floating point context */
+ /* TODO */
+ pushl ErrStr
+ call _DbgPrint
+ popl %ecx
+ 
+l_NoFloatSave:
+
+ /* switch to the specified fiber */
+ movl 0x4(%esp), %eax          /* Fiber = lpFiber */
+ movl %eax, 0x10(%ecx)         /* Teb->Tib.FiberData = Fiber */
+
+ /* restore the volatile context of the specified fiber */
+ movl 0x4(%eax),   %edx
+ movl %edx,        0x0(%ecx)   /* Teb->ExceptionList = Fiber->ExceptionList */
+ movl 0x8(%eax),   %edx
+ movl %edx,        0x4(%ecx)   /* Teb->StackBase = Fiber->StackBase */
+ movl 0xC(%eax),   %edx
+ movl %edx,        0x8(%ecx)   /* Teb->StackLimit = Fiber->StackLimit */
+ movl 0x10(%eax),  %edx
+ movl %edx,        0xE0C(%ecx) /* Teb->StackBottom = Fiber->DeallocationStack */
+ movl 0x18(%eax),  %edx        /* edx = Fiber->Eip */
+ movl 0x1C(%eax),  %esp        /* esp = Fiber->Esp */
+ movl 0x20(%eax),  %ebp        /* ebp = Fiber->Ebp */
+ movl 0x24(%eax),  %ebx        /* ebx = Fiber->Ebx */
+ movl 0x28(%eax),  %esi        /* esi = Fiber->Esi */
+ movl 0x2C(%eax),  %edi        /* edi = Fiber->Edi */
+
+ testb $1, 0x14(%eax)
+ jz l_NoFloatSave
+ 
+ /* restore the floating point context */
+ /* TODO */
+ pushl ErrStr
+ call _DbgPrint
+ popl %ecx
+ 
+l_NoFloatRestore:
+
+ /* jump to the saved program counter */
+ jmp *%edx
+
+/* EOF */