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Let native libpthread set up its own small stack, but jump to our own as soon as possible (#250)
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src/libdyld/threads.cpp
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src/libdyld/threads.cpp
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pthread_once(&reaper_once, start_reaper);
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pthread_attr_init(&attr);
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//pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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// pthread_attr_setstacksize(&attr, stack_size);
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pth = ::mmap(nullptr, stack_size + pth_obj_size + 0x1000, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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pthread_attr_setstack(&attr, ((char*)pth) + pth_obj_size, stack_size - pth_obj_size - 0x1000);
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// pthread_attr_setstack is bugged. The documentation states we should provide the lowest
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// address of the stack, yet some versions regard it as the highest address instead.
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// Therefore it's better to just make the pthread stack as small as possible and then switch
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// to our own stack instead.
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//pthread_attr_setstack(&attr, ((char*)pth) + pth_obj_size, stack_size - pth_obj_size - 0x1000);
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// std::cout << "Allocated stack at " << pth << ", size " << stack_size << std::endl;
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//std::cout << "Allocated stack at " << pth << ", size " << stack_size << std::endl;
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pth = static_cast<char*>(pth) + stack_size + 0x1000;
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pthread_attr_setstacksize(&attr, 4096);
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args.pth = pth;
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pthread_create(&nativeLibcThread, &attr, darling_thread_entry, &args);
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#ifdef __x86_64__
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__asm__ __volatile__ (
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"movq %1, %%rdi\n"
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"movq %%rdi, %%rsp\n"
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"movq 40(%0), %%rsi\n"
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"movq 8(%0), %%rdx\n"
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"testq %%rdx, %%rdx\n"
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#elif defined(__i386__) // TODO: args in eax, ebx, ecx, edx, edi, esi
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__asm__ __volatile__ (
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"movl (%0), %%eax\n"
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"movl (%1), %%esp\n"
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"pushl %%eax\n" // address to be jumped to
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"movl %1, 28(%0)\n"
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"movl %1, %%eax\n" // 1st arg