| Thread overview | ||||||||
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December 07, 2007 [Warning] Fiber in tango.core.Thread still bug, dont use it in any scientific calculation | ||||
|---|---|---|---|---|
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 | Any float point calculation in both main Fiber/slave Fiber will cause uncertain result, unless your CPU is 386sx with FP emu clib.
This bug exsits on both Win32 and x86 Linux Tango lib. Please dont use Fiber class unless you are sure there no any float point calculation in you program and in ALL api/lib you imported.
Thread.d firber context switch bug, there is no FP register save/restore. EBX ESI EDI EBP ESP IP FS only. this code is unsafe!
==========CUT from tango/core/Thread.d line:2369-2405=======
version( AsmX86_Win32 )
{
asm
{
naked;
// save current stack state
push EBP;
mov EBP, ESP;
push EAX;
push dword ptr FS:[0];
push dword ptr FS:[4];
push dword ptr FS:[8];
push EBX;
push ESI;
push EDI;
// store oldp again with more accurate address
mov EAX, dword ptr 8[EBP];
mov [EAX], ESP;
// load newp to begin context switch
mov ESP, dword ptr 12[EBP];
// load saved state from new stack
pop EDI;
pop ESI;
pop EBX;
pop dword ptr FS:[8];
pop dword ptr FS:[4];
pop dword ptr FS:[0];
pop EAX;
pop EBP;
// 'return' to complete switch
ret;
}
}
===============CUT END====================
GNU glibc2.7 swapcontext.S code is safe
===============CUT===================
ENTRY(__swapcontext)
/* Load address of the context data structure we save in. */
movl 4(%esp), %eax
/* Return value of swapcontext. EAX is the only register whose
value is not preserved. */
movl $0, oEAX(%eax)
/* Save the 32-bit register values and the return address. */
movl %ecx, oECX(%eax)
movl %edx, oEDX(%eax)
movl %edi, oEDI(%eax)
movl %esi, oESI(%eax)
movl %ebp, oEBP(%eax)
movl (%esp), %ecx
movl %ecx, oEIP(%eax)
leal 4(%esp), %ecx
movl %ecx, oESP(%eax)
movl %ebx, oEBX(%eax)
/* Save the FS segment register. */
xorl %edx, %edx
movw %fs, %dx
movl %edx, oFS(%eax)
/* We have separate floating-point register content memory on the
stack. We use the __fpregs_mem block in the context. Set the
links up correctly. */
leal oFPREGSMEM(%eax), %ecx
movl %ecx, oFPREGS(%eax)
/* Save the floating-point context. */
fnstenv (%ecx)
/* Load address of the context data structure we have to load. */
movl 8(%esp), %ecx
/* Save the current signal mask and install the new one. */
pushl %ebx
leal oSIGMASK(%eax), %edx
leal oSIGMASK(%ecx), %ecx
movl $SIG_SETMASK, %ebx
movl $__NR_sigprocmask, %eax
ENTER_KERNEL
popl %ebx
cmpl $-4095, %eax /* Check %eax for error. */
jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
/* EAX was modified, reload it. */
movl 8(%esp), %eax
/* Restore the floating-point context. Not the registers, only the
rest. */
movl oFPREGS(%eax), %ecx
fldenv (%ecx)
/* Restore the FS segment register. We don't touch the GS register
since it is used for threads. */
movl oFS(%eax), %edx
movw %dx, %fs
/* Fetch the address to return to. */
movl oEIP(%eax), %ecx
/* Load the new stack pointer. */
movl oESP(%eax), %esp
/* Push the return address on the new stack so we can return there. */
pushl %ecx
/* Load the values of all the 32-bit registers (except ESP).
Since we are loading from EAX, it must be last. */
movl oEDI(%eax), %edi
movl oESI(%eax), %esi
movl oEBP(%eax), %ebp
movl oEBX(%eax), %ebx
movl oEDX(%eax), %edx
movl oECX(%eax), %ecx
movl oEAX(%eax), %eax
/* The following 'ret' will pop the address of the code and jump
to it. */
L(pseudo_end):
ret
PSEUDO_END(__swapcontext)
=============CUT END=================
Microsoft Windows Server 2003 SwitchToFiber code also safe.
===========Kernel32.dll SwitchToFiber==============
7C821804 k>/$ 64:8B15 18000000 mov edx,dword ptr fs:[18]
7C82180B |. 8B42 10 mov eax,dword ptr ds:[edx+10]
7C82180E |. 8998 B8000000 mov dword ptr ds:[eax+B8],ebx
7C821814 |. 89B8 B0000000 mov dword ptr ds:[eax+B0],edi
7C82181A |. 89B0 B4000000 mov dword ptr ds:[eax+B4],esi
7C821820 |. 89A8 C8000000 mov dword ptr ds:[eax+C8],ebp
7C821826 |. 8178 14 0F000100 cmp dword ptr ds:[eax+14],1000F
7C82182D |. 75 14 jnz short kernel32.7C821843
7C82182F |. 9B wait
7C821830 |. DD78 34 fstsw word ptr ds:[eax+34]
7C821833 |. D978 30 fstcw word ptr ds:[eax+30]
7C821836 |. 803D 7A02FE7F 01 cmp byte ptr ds:[7FFE027A],1
7C82183D |. 75 04 jnz short kernel32.7C821843
7C82183F |. 0FAE58 28 stmxcsr dword ptr ds:[eax+28]
7C821843 |> 89A0 D8000000 mov dword ptr ds:[eax+D8],esp
7C821849 |. 8B8A B40F0000 mov ecx,dword ptr ds:[edx+FB4]
7C82184F |. 8988 E8020000 mov dword ptr ds:[eax+2E8],ecx
7C821855 |. 8B8A A8010000 mov ecx,dword ptr ds:[edx+1A8]
7C82185B |. 8988 E4020000 mov dword ptr ds:[eax+2E4],ecx
7C821861 |. 8B0A mov ecx,dword ptr ds:[edx]
7C821863 |. 8B5A 08 mov ebx,dword ptr ds:[edx+8]
7C821866 |. 8BB2 780F0000 mov esi,dword ptr ds:[edx+F78]
7C82186C |. 8948 04 mov dword ptr ds:[eax+4],ecx
7C82186F |. 8958 0C mov dword ptr ds:[eax+C],ebx
7C821872 |. 89B0 EC020000 mov dword ptr ds:[eax+2EC],esi
7C821878 |. 8B4C24 04 mov ecx,dword ptr ss:[esp+4]
7C82187C |. 894A 10 mov dword ptr ds:[edx+10],ecx
7C82187F |. 8B71 04 mov esi,dword ptr ds:[ecx+4]
7C821882 |. 8B59 08 mov ebx,dword ptr ds:[ecx+8]
7C821885 |. 8932 mov dword ptr ds:[edx],esi
7C821887 |. 895A 04 mov dword ptr ds:[edx+4],ebx
7C82188A |. 8B71 0C mov esi,dword ptr ds:[ecx+C]
7C82188D |. 8B59 10 mov ebx,dword ptr ds:[ecx+10]
7C821890 |. 8BB9 EC020000 mov edi,dword ptr ds:[ecx+2EC]
7C821896 |. 8972 08 mov dword ptr ds:[edx+8],esi
7C821899 |. 899A 0C0E0000 mov dword ptr ds:[edx+E0C],ebx
7C82189F |. 89BA 780F0000 mov dword ptr ds:[edx+F78],edi
7C8218A5 |. 8BB1 E4020000 mov esi,dword ptr ds:[ecx+2E4]
7C8218AB |. 89B2 A8010000 mov dword ptr ds:[edx+1A8],esi
7C8218B1 |. 8179 14 0F000100 cmp dword ptr ds:[ecx+14],1000F
7C8218B8 |. 75 28 jnz short kernel32.7C8218E2
7C8218BA |. 8B58 34 mov ebx,dword ptr ds:[eax+34]
7C8218BD |. 66:3B59 34 cmp bx,word ptr ds:[ecx+34]
7C8218C1 |. 75 09 jnz short kernel32.7C8218CC
7C8218C3 |. 8B58 30 mov ebx,dword ptr ds:[eax+30]
7C8218C6 |. 66:3B59 30 cmp bx,word ptr ds:[ecx+30]
7C8218CA |. 74 09 je short kernel32.7C8218D5
7C8218CC |> 66:C741 38 FFFF mov word ptr ds:[ecx+38],0FFFF
7C8218D2 |. D961 30 fldenv (28-byte) ptr ds:[ecx+30]
7C8218D5 |> 803D 7A02FE7F 01 cmp byte ptr ds:[7FFE027A],1
7C8218DC |. 75 04 jnz short kernel32.7C8218E2
7C8218DE |. 0FAE51 28 ldmxcsr dword ptr ds:[ecx+28]
7C8218E2 |> 8BB9 B0000000 mov edi,dword ptr ds:[ecx+B0]
7C8218E8 |. 8BB1 B4000000 mov esi,dword ptr ds:[ecx+B4]
7C8218EE |. 8BA9 C8000000 mov ebp,dword ptr ds:[ecx+C8]
7C8218F4 |. 8B99 B8000000 mov ebx,dword ptr ds:[ecx+B8]
7C8218FA |. 8B81 E8020000 mov eax,dword ptr ds:[ecx+2E8]
7C821900 |. 8982 B40F0000 mov dword ptr ds:[edx+FB4],eax
7C821906 |. 8BA1 D8000000 mov esp,dword ptr ds:[ecx+D8]
7C82190C \. C2 0400 retn 4
===============CUT END=====================
Hope this bug fix fast because tango is my standard lib.
| |||
Permalink
ReplyDecember 07, 2007 Re: [Warning] Fiber in tango.core.Thread still bug, dont use it in any scientific calculation | ||||
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| ||||
 Posted in reply to Swer | Have you tried testing this with any examples? I'm fairly certain that the FPU does actually do what it is supposed to. If you will notice, the calling convention on the method is extern(C), not extern(D). As a result, the C calling specification requires that the FPU state is saved before any function call by the caller - not the callee. As a result, this method should work and moreover save a great deal of time. Dumping the FPU state is a rather costly operation, and best avoided if possible, which is why the C calling convention works this way.
If you can find code that breaks with the current Tango fiber implementation, I'd be happy to make the necessary changes.
-Mik
Swer Wrote:
> Any float point calculation in both main Fiber/slave Fiber will cause uncertain result, unless your CPU is 386sx with FP emu clib.
>
> This bug exsits on both Win32 and x86 Linux Tango lib. Please dont use Fiber class unless you are sure there no any float point calculation in you program and in ALL api/lib you imported.
>
> Thread.d firber context switch bug, there is no FP register save/restore. EBX ESI EDI EBP ESP IP FS only. this code is unsafe!
>
> ==========CUT from tango/core/Thread.d line:2369-2405=======
> version( AsmX86_Win32 )
> {
> asm
> {
> naked;
>
> // save current stack state
> push EBP;
> mov EBP, ESP;
> push EAX;
> push dword ptr FS:[0];
> push dword ptr FS:[4];
> push dword ptr FS:[8];
> push EBX;
> push ESI;
> push EDI;
>
> // store oldp again with more accurate address
> mov EAX, dword ptr 8[EBP];
> mov [EAX], ESP;
> // load newp to begin context switch
> mov ESP, dword ptr 12[EBP];
>
> // load saved state from new stack
> pop EDI;
> pop ESI;
> pop EBX;
> pop dword ptr FS:[8];
> pop dword ptr FS:[4];
> pop dword ptr FS:[0];
> pop EAX;
> pop EBP;
>
> // 'return' to complete switch
> ret;
> }
> }
> ===============CUT END====================
>
>
> GNU glibc2.7 swapcontext.S code is safe
> ===============CUT===================
> ENTRY(__swapcontext)
> /* Load address of the context data structure we save in. */
> movl 4(%esp), %eax
>
> /* Return value of swapcontext. EAX is the only register whose
> value is not preserved. */
> movl $0, oEAX(%eax)
>
> /* Save the 32-bit register values and the return address. */
> movl %ecx, oECX(%eax)
> movl %edx, oEDX(%eax)
> movl %edi, oEDI(%eax)
> movl %esi, oESI(%eax)
> movl %ebp, oEBP(%eax)
> movl (%esp), %ecx
> movl %ecx, oEIP(%eax)
> leal 4(%esp), %ecx
> movl %ecx, oESP(%eax)
> movl %ebx, oEBX(%eax)
>
> /* Save the FS segment register. */
> xorl %edx, %edx
> movw %fs, %dx
> movl %edx, oFS(%eax)
>
> /* We have separate floating-point register content memory on the
> stack. We use the __fpregs_mem block in the context. Set the
> links up correctly. */
> leal oFPREGSMEM(%eax), %ecx
> movl %ecx, oFPREGS(%eax)
> /* Save the floating-point context. */
> fnstenv (%ecx)
>
> /* Load address of the context data structure we have to load. */
> movl 8(%esp), %ecx
>
> /* Save the current signal mask and install the new one. */
> pushl %ebx
> leal oSIGMASK(%eax), %edx
> leal oSIGMASK(%ecx), %ecx
> movl $SIG_SETMASK, %ebx
> movl $__NR_sigprocmask, %eax
> ENTER_KERNEL
> popl %ebx
> cmpl $-4095, %eax /* Check %eax for error. */
> jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
>
> /* EAX was modified, reload it. */
> movl 8(%esp), %eax
>
> /* Restore the floating-point context. Not the registers, only the
> rest. */
> movl oFPREGS(%eax), %ecx
> fldenv (%ecx)
>
> /* Restore the FS segment register. We don't touch the GS register
> since it is used for threads. */
> movl oFS(%eax), %edx
> movw %dx, %fs
>
> /* Fetch the address to return to. */
> movl oEIP(%eax), %ecx
>
> /* Load the new stack pointer. */
> movl oESP(%eax), %esp
>
> /* Push the return address on the new stack so we can return there. */
> pushl %ecx
>
> /* Load the values of all the 32-bit registers (except ESP).
> Since we are loading from EAX, it must be last. */
> movl oEDI(%eax), %edi
> movl oESI(%eax), %esi
> movl oEBP(%eax), %ebp
> movl oEBX(%eax), %ebx
> movl oEDX(%eax), %edx
> movl oECX(%eax), %ecx
> movl oEAX(%eax), %eax
>
> /* The following 'ret' will pop the address of the code and jump
> to it. */
>
> L(pseudo_end):
> ret
> PSEUDO_END(__swapcontext)
> =============CUT END=================
>
>
> Microsoft Windows Server 2003 SwitchToFiber code also safe.
> ===========Kernel32.dll SwitchToFiber==============
> 7C821804 k>/$ 64:8B15 18000000 mov edx,dword ptr fs:[18]
> 7C82180B |. 8B42 10 mov eax,dword ptr ds:[edx+10]
> 7C82180E |. 8998 B8000000 mov dword ptr ds:[eax+B8],ebx
> 7C821814 |. 89B8 B0000000 mov dword ptr ds:[eax+B0],edi
> 7C82181A |. 89B0 B4000000 mov dword ptr ds:[eax+B4],esi
> 7C821820 |. 89A8 C8000000 mov dword ptr ds:[eax+C8],ebp
> 7C821826 |. 8178 14 0F000100 cmp dword ptr ds:[eax+14],1000F
> 7C82182D |. 75 14 jnz short kernel32.7C821843
> 7C82182F |. 9B wait
> 7C821830 |. DD78 34 fstsw word ptr ds:[eax+34]
> 7C821833 |. D978 30 fstcw word ptr ds:[eax+30]
> 7C821836 |. 803D 7A02FE7F 01 cmp byte ptr ds:[7FFE027A],1
> 7C82183D |. 75 04 jnz short kernel32.7C821843
> 7C82183F |. 0FAE58 28 stmxcsr dword ptr ds:[eax+28]
> 7C821843 |> 89A0 D8000000 mov dword ptr ds:[eax+D8],esp
> 7C821849 |. 8B8A B40F0000 mov ecx,dword ptr ds:[edx+FB4]
> 7C82184F |. 8988 E8020000 mov dword ptr ds:[eax+2E8],ecx
> 7C821855 |. 8B8A A8010000 mov ecx,dword ptr ds:[edx+1A8]
> 7C82185B |. 8988 E4020000 mov dword ptr ds:[eax+2E4],ecx
> 7C821861 |. 8B0A mov ecx,dword ptr ds:[edx]
> 7C821863 |. 8B5A 08 mov ebx,dword ptr ds:[edx+8]
> 7C821866 |. 8BB2 780F0000 mov esi,dword ptr ds:[edx+F78]
> 7C82186C |. 8948 04 mov dword ptr ds:[eax+4],ecx
> 7C82186F |. 8958 0C mov dword ptr ds:[eax+C],ebx
> 7C821872 |. 89B0 EC020000 mov dword ptr ds:[eax+2EC],esi
> 7C821878 |. 8B4C24 04 mov ecx,dword ptr ss:[esp+4]
> 7C82187C |. 894A 10 mov dword ptr ds:[edx+10],ecx
> 7C82187F |. 8B71 04 mov esi,dword ptr ds:[ecx+4]
> 7C821882 |. 8B59 08 mov ebx,dword ptr ds:[ecx+8]
> 7C821885 |. 8932 mov dword ptr ds:[edx],esi
> 7C821887 |. 895A 04 mov dword ptr ds:[edx+4],ebx
> 7C82188A |. 8B71 0C mov esi,dword ptr ds:[ecx+C]
> 7C82188D |. 8B59 10 mov ebx,dword ptr ds:[ecx+10]
> 7C821890 |. 8BB9 EC020000 mov edi,dword ptr ds:[ecx+2EC]
> 7C821896 |. 8972 08 mov dword ptr ds:[edx+8],esi
> 7C821899 |. 899A 0C0E0000 mov dword ptr ds:[edx+E0C],ebx
> 7C82189F |. 89BA 780F0000 mov dword ptr ds:[edx+F78],edi
> 7C8218A5 |. 8BB1 E4020000 mov esi,dword ptr ds:[ecx+2E4]
> 7C8218AB |. 89B2 A8010000 mov dword ptr ds:[edx+1A8],esi
> 7C8218B1 |. 8179 14 0F000100 cmp dword ptr ds:[ecx+14],1000F
> 7C8218B8 |. 75 28 jnz short kernel32.7C8218E2
> 7C8218BA |. 8B58 34 mov ebx,dword ptr ds:[eax+34]
> 7C8218BD |. 66:3B59 34 cmp bx,word ptr ds:[ecx+34]
> 7C8218C1 |. 75 09 jnz short kernel32.7C8218CC
> 7C8218C3 |. 8B58 30 mov ebx,dword ptr ds:[eax+30]
> 7C8218C6 |. 66:3B59 30 cmp bx,word ptr ds:[ecx+30]
> 7C8218CA |. 74 09 je short kernel32.7C8218D5
> 7C8218CC |> 66:C741 38 FFFF mov word ptr ds:[ecx+38],0FFFF
> 7C8218D2 |. D961 30 fldenv (28-byte) ptr ds:[ecx+30]
> 7C8218D5 |> 803D 7A02FE7F 01 cmp byte ptr ds:[7FFE027A],1
> 7C8218DC |. 75 04 jnz short kernel32.7C8218E2
> 7C8218DE |. 0FAE51 28 ldmxcsr dword ptr ds:[ecx+28]
> 7C8218E2 |> 8BB9 B0000000 mov edi,dword ptr ds:[ecx+B0]
> 7C8218E8 |. 8BB1 B4000000 mov esi,dword ptr ds:[ecx+B4]
> 7C8218EE |. 8BA9 C8000000 mov ebp,dword ptr ds:[ecx+C8]
> 7C8218F4 |. 8B99 B8000000 mov ebx,dword ptr ds:[ecx+B8]
> 7C8218FA |. 8B81 E8020000 mov eax,dword ptr ds:[ecx+2E8]
> 7C821900 |. 8982 B40F0000 mov dword ptr ds:[edx+FB4],eax
> 7C821906 |. 8BA1 D8000000 mov esp,dword ptr ds:[ecx+D8]
> 7C82190C \. C2 0400 retn 4
> ===============CUT END=====================
>
> Hope this bug fix fast because tango is my standard lib.
>
>
| |||
December 08, 2007 Re: [Warning] Fiber in tango.core.Thread still bug, dont use it in any scientific calculation | ||||
|---|---|---|---|---|
| ||||
Posted in reply to Mikola Lysenko | I open 50 threads in my project, each threads have one master fiber and one slave fiber. each salve fiber instance a LUA 5.1 lua_State*, A Lua api my_yield() calling D Tango Fiber yield in my script. Lua number is double type, and my master fiber will handle bothe network and DirectX. So there both master/slave firbers touch FP units. My program crash randomly when using Tango Fiber, but when using Win32 SwitchToFiber or Posix swapcontext theres no crash anymore.
I do trace on you code by OllyDbg, there is no any FP save/restore internally by C calling convention. Have u tried use your Fiber on any real world project before submit to Tango library?
> Have you tried testing this with any examples? I'm fairly certain that the FPU does actually do what it is supposed to. If you will notice, the calling convention on the method is extern(C), not extern(D). As a result, the C calling specification requires that the FPU state is saved before any function call by the caller - not the callee. As a result, this method should work and moreover save a great deal of time. Dumping the FPU state is a rather costly operation, and best avoided if possible, which is why the C calling convention works this way.
>
> If you can find code that breaks with the current Tango fiber implementation, I'd be happy to make the necessary changes.
| |||
December 08, 2007 Re: [Warning] Fiber in tango.core.Thread still bug, dont use it in any scientific calculation | ||||
|---|---|---|---|---|
| ||||
Posted in reply to Swer | I've used Fibers and StackThreads in several independent projects, many which happened to be heavily floating point intensive (ie 3D demos, videogames, etc). I believe that the code used in Tango's Fibers for swapping contexts is both correct, and also more efficient than either GCC or Win32's SwapContext. The justification for this follows from my previous argument about the cdecl calling convention, which is corroborated by the following evidence: http://www.agner.org/optimize/calling_conventions.pdf "Floating point registers : The floating point registers ST(0)-ST(7) need not be saved. These registers must be emptied before any call or return, except for registers used for return values. ... " I'm not exactly sure what is causing these crashes, but I can't fix any errors unless you post an example where the code breaks. It is possible that a more serious issue than floating point state is involved, but I can't determine what is happening given the information. -Mik Swer Wrote: > I open 50 threads in my project, each threads have one master fiber and one slave fiber. each salve fiber instance a LUA 5.1 lua_State*, A Lua api my_yield() calling D Tango Fiber yield in my script. Lua number is double type, and my master fiber will handle bothe network and DirectX. So there both master/slave firbers touch FP units. My program crash randomly when using Tango Fiber, but when using Win32 SwitchToFiber or Posix swapcontext theres no crash anymore. > > I do trace on you code by OllyDbg, there is no any FP save/restore internally by C calling convention. Have u tried use your Fiber on any real world project before submit to Tango library? > > > Have you tried testing this with any examples? I'm fairly certain that the FPU does actually do what it is supposed to. If you will notice, the calling convention on the method is extern(C), not extern(D). As a result, the C calling specification requires that the FPU state is saved before any function call by the caller - not the callee. As a result, this method should work and moreover save a great deal of time. Dumping the FPU state is a rather costly operation, and best avoided if possible, which is why the C calling convention works this way. > > > > If you can find code that breaks with the current Tango fiber implementation, I'd be happy to make the necessary changes. > > | |||
December 08, 2007 Re: [Warning] Fiber in tango.core.Thread still bug, dont use it in any scientific calculation | ||||
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Posted in reply to Mikola Lysenko | Now im using SwitchToFiber instead Tango Fiber. Right now i dont have so much time to split some example from my project. Here I also find an other SwitchToFiber implement by ReactOS (open source windows clone). Context switch with FP save/restore also, with comment in source code. > I'm not exactly sure what is causing these crashes, but I can't fix any errors unless you post an example where the code breaks. It is possible that a more serious issue than floating point state is involved, but I can't determine what is happening given the information. ======= ReactOS-0.3.3/dll/win32/kernel32/thread/i386/fiber.S ====== /* * 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 * PROGRAMMERS: Alex Ionescu (alex@relsoft.net) * KJK::Hyperion <noog@libero.it> */ #include <ndk/asm.h> #define CONTEXT_FULL 0x10007 #define CONTEXT_FLOATING_POINT 0xF .globl _SwitchToFiber@4 .intel_syntax noprefix _SwitchToFiber@4: /* Get the TEB */ mov edx, fs:[KGDT_R3_TEB] /* Get the Fiber */ mov eax, [edx+TEB_FIBER_DATA] /* Save the non-volatile registers */ mov [eax+FIBER_CONTEXT_EBX], ebx mov [eax+FIBER_CONTEXT_ESI], esi mov [eax+FIBER_CONTEXT_EDI], edi mov [eax+FIBER_CONTEXT_EBP], ebp /* Check if we're to save FPU State */ cmp dword ptr [eax+FIBER_CONTEXT_FLAGS], CONTEXT_FULL + CONTEXT_FLOATING_POINT jnz NoFpuStateSave /* Save the FPU State (Status and Control)*/ fstsw [eax+FIBER_CONTEXT_FLOAT_SAVE_STATUS_WORD] fstcw [eax+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD] /* Check if the CPU supports SIMD MXCSR State Save */ cmp byte ptr [PROCESSOR_FEATURE_FXSR], 0 jnz NoFpuStateSave stmxcsr [eax+FIBER_CONTEXT_DR6] NoFpuStateSave: /* Save stack since we're not touching it anymore */ mov [eax+FIBER_CONTEXT_ESP], esp /* Transfer some data from the TEB */ mov ecx, [edx+TEB_FLS_DATA] mov [eax+FIBER_FLS_DATA], ecx mov ecx, [edx+TEB_ACTIVATION_CONTEXT_STACK_POINTER] mov [eax+FIBER_ACTIVATION_CONTEXT_STACK], ecx /* Transfer some data related to the Stack */ mov ecx, [edx+TEB_EXCEPTION_LIST] mov [eax+FIBER_EXCEPTION_LIST], ecx mov ecx, [edx+TEB_STACK_LIMIT] mov [eax+FIBER_STACK_LIMIT], ecx mov ecx, [edx+TEB_GUARANTEED_STACK_BYTES] mov [eax+FIBER_GUARANTEED_STACK_BYTES], ecx /* Switch to the new fiber */ mov ecx, [esp+4] mov [edx+TEB_FIBER_DATA], ecx /* Switch Fiber Data */ mov esi, [ecx+FIBER_EXCEPTION_LIST] mov [edx+TEB_EXCEPTION_LIST], esi mov esi, [ecx+FIBER_STACK_BASE] mov [edx+TEB_STACK_BASE], esi mov esi, [ecx+FIBER_STACK_LIMIT] mov [edx+TEB_STACK_LIMIT], esi mov esi, [ecx+FIBER_DEALLOCATION_STACK] mov [edx+TEB_DEALLOCATION_STACK], esi mov esi, [ecx+FIBER_GUARANTEED_STACK_BYTES] mov [edx+TEB_GUARANTEED_STACK_BYTES], esi mov esi, [ecx+FIBER_ACTIVATION_CONTEXT_STACK] mov [edx+TEB_ACTIVATION_CONTEXT_STACK_POINTER], esi /* Restore FPU State */ cmp dword ptr [eax+FIBER_CONTEXT_FLAGS], CONTEXT_FULL + CONTEXT_FLOATING_POINT jnz NoFpuStateRestore /* Check if the Status Word Changed */ mov esi, [eax+FIBER_CONTEXT_FLOAT_SAVE_STATUS_WORD] cmp si, word ptr [ecx+FIBER_CONTEXT_FLOAT_SAVE_STATUS_WORD] jnz StatusWordChanged /* Check if the Control Word Changed */ mov esi, [eax+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD] cmp si, word ptr [ecx+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD] jz ControlWordEqual StatusWordChanged: /* Load the new one */ mov word ptr [ecx+FIBER_CONTEXT_FLOAT_SAVE_TAG_WORD], 0xFFFF fldenv [ecx+FIBER_CONTEXT_FLOAT_SAVE_CONTROL_WORD] ControlWordEqual: /* Load the new one */ cmp byte ptr [PROCESSOR_FEATURE_FXSR], 0 jnz NoFpuStateRestore ldmxcsr [ecx+FIBER_CONTEXT_DR6] NoFpuStateRestore: /* Restore non-volatile registers */ mov esi, [ecx+FIBER_CONTEXT_ESI] mov edi, [ecx+FIBER_CONTEXT_EDI] mov ebx, [ecx+FIBER_CONTEXT_EBX] mov ebp, [ecx+FIBER_CONTEXT_EBP] mov esp, [ecx+FIBER_CONTEXT_ESP] /* Restore FLS Data */ mov eax, [ecx+FIBER_FLS_DATA] mov [edx+TEB_FLS_DATA], eax /* Return */ ret 4 /* EOF */ ====== ReactOS-0.3.3/dll/win32/kernel32/thread/i386/fiber.S END === | |||
December 08, 2007 Re: [Warning] Fiber in tango.core.Thread still bug, dont use it in any scientific calculation | ||||
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 Posted in reply to Swer | Swer wrote:
> Now im using SwitchToFiber instead Tango Fiber. Right now i dont have so much time to split some example from my project.
No offense, but it's kind of difficult to fix an issue that can't be reproduced. Do you really want Tango's Fibers to be fixed or did you post here just to say that they stink?
Sean
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