diff options
Diffstat (limited to 'nsprpub/pr/src/md/windows/ntgc.c')
| -rw-r--r-- | nsprpub/pr/src/md/windows/ntgc.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/windows/ntgc.c b/nsprpub/pr/src/md/windows/ntgc.c new file mode 100644 index 0000000000..20ad8a81e4 --- /dev/null +++ b/nsprpub/pr/src/md/windows/ntgc.c @@ -0,0 +1,98 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * GC related routines + * + */ +#include <windows.h> +#include "primpl.h" + +PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np) +{ +#if defined(_X86_) + CONTEXT context; + context.ContextFlags = CONTEXT_INTEGER; + + if (_PR_IS_NATIVE_THREAD(t)) { + context.ContextFlags |= CONTEXT_CONTROL; + if (GetThreadContext(t->md.handle, &context)) { + t->md.gcContext[0] = context.Eax; + t->md.gcContext[1] = context.Ebx; + t->md.gcContext[2] = context.Ecx; + t->md.gcContext[3] = context.Edx; + t->md.gcContext[4] = context.Esi; + t->md.gcContext[5] = context.Edi; + t->md.gcContext[6] = context.Esp; + t->md.gcContext[7] = context.Ebp; + *np = PR_NUM_GCREGS; + } else { + PR_ASSERT(0);/* XXX */ + } + } else { + /* WARNING WARNING WARNING WARNING WARNING WARNING WARNING + * + * This code is extremely machine dependant and completely + * undocumented by MS. Its only known to work experimentally. + * Ready for a walk on the wild * side? + * + * WARNING WARNING WARNING WARNING WARNING WARNING WARNING */ + +#if !defined WIN95 // Win95 does not have fibers + int *fiberData = t->md.fiber_id; + + /* I found these offsets by disassembling SwitchToFiber(). + * Are your palms sweating yet? + */ + + /* + ** EAX is on the stack (ESP+0) + ** EDX is on the stack (ESP+4) + ** ECX is on the stack (ESP+8) + */ + t->md.gcContext[0] = 0; /* context.Eax */ + t->md.gcContext[1] = fiberData[0x2e]; /* context.Ebx */ + t->md.gcContext[2] = 0; /* context.Ecx */ + t->md.gcContext[3] = 0; /* context.Edx */ + t->md.gcContext[4] = fiberData[0x2d]; /* context.Esi */ + t->md.gcContext[5] = fiberData[0x2c]; /* context.Edi */ + t->md.gcContext[6] = fiberData[0x36]; /* context.Esp */ + t->md.gcContext[7] = fiberData[0x32]; /* context.Ebp */ + *np = PR_NUM_GCREGS; +#endif + } + return (PRWord *)&t->md.gcContext; +#else + PR_NOT_REACHED("not implemented"); + return NULL; +#endif /* defined(_X86_) */ +} + +/* This function is not used right now, but is left as a reference. + * If you ever need to get the fiberID from the currently running fiber, + * this is it. + */ +void * +GetMyFiberID() +{ +#if defined(_X86_) && !defined(__MINGW32__) + void *fiberData; + + /* A pointer to our tib entry is found at FS:[18] + * At offset 10h is the fiberData pointer. The context of the + * fiber is stored in there. + */ + __asm { + mov EDX, FS:[18h] + mov EAX, DWORD PTR [EDX+10h] + mov [fiberData], EAX + } + + return fiberData; +#else + PR_NOT_REACHED("not implemented"); + return NULL; +#endif /* defined(_X86_) */ +} |