89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
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/*
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* this is the internal transfer function.
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*
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* HISTORY
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* 24-Nov-02 Christian Tismer <tismer@tismer.com>
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* needed to add another magic constant to insure
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* that f in slp_eval_frame(PyFrameObject *f)
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* STACK_REFPLUS will probably be 1 in most cases.
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* gets included into the saved stack area.
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* 26-Sep-02 Christian Tismer <tismer@tismer.com>
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* again as a result of virtualized stack access,
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* the compiler used less registers. Needed to
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* explicit mention registers in order to get them saved.
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* Thanks to Jeff Senn for pointing this out and help.
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* 17-Sep-02 Christian Tismer <tismer@tismer.com>
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* after virtualizing stack save/restore, the
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* stack size shrunk a bit. Needed to introduce
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* an adjustment STACK_MAGIC per platform.
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* 15-Sep-02 Gerd Woetzel <gerd.woetzel@GMD.DE>
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* slightly changed framework for sparc
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* 01-Mar-02 Christian Tismer <tismer@tismer.com>
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* Initial final version after lots of iterations for i386.
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*/
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#define alloca _alloca
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#define STACK_REFPLUS 1
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#ifdef SLP_EVAL
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#define STACK_MAGIC 0
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/* Some magic to quell warnings and keep slp_switch() from crashing when built
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with VC90. Disable global optimizations, and the warning: frame pointer
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register 'ebp' modified by inline assembly code */
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#pragma optimize("g", off)
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#pragma warning(disable:4731)
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static int
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slp_switch(void)
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{
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void* seh;
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register int *stackref, stsizediff;
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__asm mov eax, fs:[0]
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__asm mov [seh], eax
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__asm mov stackref, esp;
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/* modify EBX, ESI and EDI in order to get them preserved */
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__asm mov ebx, ebx;
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__asm xchg esi, edi;
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{
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SLP_SAVE_STATE(stackref, stsizediff);
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__asm {
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mov eax, stsizediff
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add esp, eax
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add ebp, eax
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}
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SLP_RESTORE_STATE();
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}
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__asm mov eax, [seh]
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__asm mov fs:[0], eax
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return 0;
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}
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/* re-enable ebp warning and global optimizations. */
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#pragma optimize("g", on)
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#pragma warning(default:4731)
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#endif
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/*
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* further self-processing support
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*/
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/* we have IsBadReadPtr available, so we can peek at objects */
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#define STACKLESS_SPY
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#ifdef IMPLEMENT_STACKLESSMODULE
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#include "Windows.h"
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#define CANNOT_READ_MEM(p, bytes) IsBadReadPtr(p, bytes)
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static int IS_ON_STACK(void*p)
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{
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int stackref;
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int stackbase = ((int)&stackref) & 0xfffff000;
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return (int)p >= stackbase && (int)p < stackbase + 0x00100000;
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}
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#endif
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