mirror of
https://github.com/reactos/reactos.git
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141 lines
4 KiB
ArmAsm
141 lines
4 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS system libraries
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* FILE: lib/kernel32/thread/i386/fiber.S
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* PURPOSE: Fiber context switch code for the x86 architecture
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* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
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* KJK::Hyperion <noog@libero.it>
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*/
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#include <asm.inc>
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#include <ks386.inc>
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EXTERN _BaseThreadStartup@8:PROC
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.code
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PUBLIC _BaseFiberStartup@0
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.PROC _BaseFiberStartup@0
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/* Frame pointer is zeroed */
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FPO 0, 0, 0, 0, 0, FRAME_FPO
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/* Get the fiber data */
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mov eax, fs:[TEB_FIBER_DATA]
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push dword ptr [eax+FIBER_CONTEXT_EBX] /* Parameter */
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push dword ptr [eax+FIBER_CONTEXT_EAX] /* Start Address */
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call _BaseThreadStartup@8
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.ENDP
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PUBLIC _SwitchToFiber@4
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_SwitchToFiber@4:
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/* Get the TEB */
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mov edx, fs:[TEB_SELF]
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/* Get the Fiber */
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mov eax, [edx+TEB_FIBER_DATA]
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/* Save the non-volatile registers */
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mov [eax+FIBER_CONTEXT_EBX], ebx
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mov [eax+FIBER_CONTEXT_ESI], esi
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mov [eax+FIBER_CONTEXT_EDI], edi
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mov [eax+FIBER_CONTEXT_EBP], ebp
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/* Check if we're to save FPU State */
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cmp dword ptr [eax+FIBER_CONTEXT_FLAGS], CONTEXT_FULL OR CONTEXT_FLOATING_POINT
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jnz NoFpuStateSave
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/* Save the FPU State (Status and Control)*/
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fstsw [eax+FIBER_CONTEXT_FLOAT_SAVE_STATUS_WORD]
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fnstcw [eax+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD]
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/* Check if the CPU supports SIMD MXCSR State Save */
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cmp byte ptr ds:[PF_XMMI_INSTRUCTIONS_AVAILABLE], 1
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jnz NoFpuStateSave
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stmxcsr [eax+FIBER_CONTEXT_DR6]
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NoFpuStateSave:
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/* Save stack since we're not touching it anymore */
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mov [eax+FIBER_CONTEXT_ESP], esp
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/* Transfer some data from the TEB */
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mov ecx, [edx+TEB_FLS_DATA]
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mov [eax+FIBER_FLS_DATA], ecx
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mov ecx, [edx+TEB_ACTIVATION_CONTEXT_STACK_POINTER]
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mov [eax+FIBER_ACTIVATION_CONTEXT_STACK], ecx
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/* Transfer some data related to the Stack */
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mov ecx, [edx+TEB_EXCEPTION_LIST]
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mov [eax+FIBER_EXCEPTION_LIST], ecx
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mov ecx, [edx+TEB_STACK_LIMIT]
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mov [eax+FIBER_STACK_LIMIT], ecx
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mov ecx, [edx+TEB_GUARANTEED_STACK_BYTES]
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mov [eax+FIBER_GUARANTEED_STACK_BYTES], ecx
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/* Switch to the new fiber */
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mov ecx, [esp+4]
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mov [edx+TEB_FIBER_DATA], ecx
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/* Switch Fiber Data */
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mov esi, [ecx+FIBER_EXCEPTION_LIST]
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mov [edx+TEB_EXCEPTION_LIST], esi
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mov esi, [ecx+FIBER_STACK_BASE]
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mov [edx+TEB_STACK_BASE], esi
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mov esi, [ecx+FIBER_STACK_LIMIT]
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mov [edx+TEB_STACK_LIMIT], esi
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mov esi, [ecx+FIBER_DEALLOCATION_STACK]
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mov [edx+TEB_DEALLOCATION_STACK], esi
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mov esi, [ecx+FIBER_GUARANTEED_STACK_BYTES]
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mov [edx+TEB_GUARANTEED_STACK_BYTES], esi
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mov esi, [ecx+FIBER_ACTIVATION_CONTEXT_STACK]
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mov [edx+TEB_ACTIVATION_CONTEXT_STACK_POINTER], esi
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/* Restore FPU State */
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cmp dword ptr [eax+FIBER_CONTEXT_FLAGS], CONTEXT_FULL OR CONTEXT_FLOATING_POINT
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jnz NoFpuStateRestore
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/* Check if the Status Word Changed */
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mov esi, [eax+FIBER_CONTEXT_FLOAT_SAVE_STATUS_WORD]
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cmp si, word ptr [ecx+FIBER_CONTEXT_FLOAT_SAVE_STATUS_WORD]
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jnz StatusWordChanged
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/* Check if the Control Word Changed */
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mov esi, [eax+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD]
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cmp si, word ptr [ecx+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD]
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jz ControlWordEqual
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StatusWordChanged:
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/* Load the new one */
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mov word ptr [ecx+FIBER_CONTEXT_FLOAT_SAVE_TAG_WORD], HEX(0FFFF)
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fldenv [ecx+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD]
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ControlWordEqual:
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/* Load the new one */
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cmp byte ptr ds:[PF_XMMI_INSTRUCTIONS_AVAILABLE], 1
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jnz NoFpuStateRestore
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ldmxcsr [ecx+FIBER_CONTEXT_DR6]
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NoFpuStateRestore:
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/* Restore non-volatile registers */
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mov esi, [ecx+FIBER_CONTEXT_ESI]
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mov edi, [ecx+FIBER_CONTEXT_EDI]
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mov ebx, [ecx+FIBER_CONTEXT_EBX]
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mov ebp, [ecx+FIBER_CONTEXT_EBP]
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mov esp, [ecx+FIBER_CONTEXT_ESP]
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/* Restore FLS Data */
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mov eax, [ecx+FIBER_FLS_DATA]
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mov [edx+TEB_FLS_DATA], eax
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/* Jump to new fiber */
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mov esp, [ecx+FIBER_CONTEXT_ESP]
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ret 4
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END
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/* EOF */
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