x86/64/thread.cpp

82 x86_restart_syscall(iframe* frame)
89 	// Get back the original system call number and modify the frame to
91 	frame->ax = frame->orig_rax;
92 	frame->ip -= 2;
121 get_signal_stack(Thread* thread, iframe* frame, struct sigaction* action,
127 			&& (frame->user_sp < thread->signal_stack_base
128 				|| frame->user_sp >= thread->signal_stack_base
138 	return (uint8*)((frame->user_sp - 128 - spaceNeeded) & ~addr_t(0xf)) - 8;
298 	iframe frame = {};
299 	frame.type = IFRAME_TYPE_SYSCALL;
300 	frame.si = (uint64)args2;
301 	frame.di = (uint64)args1;
302 	frame.ip = entry;
303 	frame.cs = USER_CODE_SELECTOR;
304 	frame.flags = X86_EFLAGS_RESERVED1 | X86_EFLAGS_INTERRUPT;
305 	frame.sp = stackTop;
306 	frame.ss = USER_DATA_SELECTOR;
309 	x86_initial_return_to_userland(thread, &frame);
322 	"restore signal frame" syscall with the (possibly modified) signal frame
345 	iframe* frame = x86_get_current_iframe();
346 	if (!IFRAME_IS_USER(frame)) {
352 	signalFrameData->context.uc_mcontext.rax = frame->ax;
353 	signalFrameData->context.uc_mcontext.rbx = frame->bx;
354 	signalFrameData->context.uc_mcontext.rcx = frame->cx;
355 	signalFrameData->context.uc_mcontext.rdx = frame->dx;
356 	signalFrameData->context.uc_mcontext.rdi = frame->di;
357 	signalFrameData->context.uc_mcontext.rsi = frame->si;
358 	signalFrameData->context.uc_mcontext.rbp = frame->bp;
359 	signalFrameData->context.uc_mcontext.r8 = frame->r8;
360 	signalFrameData->context.uc_mcontext.r9 = frame->r9;
361 	signalFrameData->context.uc_mcontext.r10 = frame->r10;
362 	signalFrameData->context.uc_mcontext.r11 = frame->r11;
363 	signalFrameData->context.uc_mcontext.r12 = frame->r12;
364 	signalFrameData->context.uc_mcontext.r13 = frame->r13;
365 	signalFrameData->context.uc_mcontext.r14 = frame->r14;
366 	signalFrameData->context.uc_mcontext.r15 = frame->r15;
367 	signalFrameData->context.uc_mcontext.rsp = frame->user_sp;
368 	signalFrameData->context.uc_mcontext.rip = frame->ip;
369 	signalFrameData->context.uc_mcontext.rflags = frame->flags;
371 	if (frame->fpu != nullptr) {
372 		memcpy((void*)&signalFrameData->context.uc_mcontext.fpu, frame->fpu,
380 	signal_get_user_stack(frame->user_sp, &signalFrameData->context.uc_stack);
383 	signalFrameData->syscall_restart_return_value = frame->orig_rax;
385 	// Get the stack to use and copy the frame data to it.
386 	uint8* userStack = get_signal_stack(thread, frame, action,
387 		sizeof(*signalFrameData) + sizeof(frame->ip));
390 		= (signal_frame_data*)(userStack + sizeof(frame->ip));
398 	if (user_memcpy(userStack, &frame->ip, sizeof(frame->ip)) != B_OK)
406 	// stack. First argument points to the frame data.
408 	frame->user_sp = (addr_t)userStack;
410 	frame->ip = commPageAddress[COMMPAGE_ENTRY_X86_SIGNAL_HANDLER]
413 	frame->di = (addr_t)userSignalFrameData;
414 	frame->flags &= ~(uint64)(X86_EFLAGS_TRAP | X86_EFLAGS_DIRECTION);
423 	iframe* frame = x86_get_current_iframe();
425 	frame->orig_rax = signalFrameData->syscall_restart_return_value;
426 	frame->ax = signalFrameData->context.uc_mcontext.rax;
427 	frame->bx = signalFrameData->context.uc_mcontext.rbx;
428 	frame->cx = signalFrameData->context.uc_mcontext.rcx;
429 	frame->dx = signalFrameData->context.uc_mcontext.rdx;
430 	frame->di = signalFrameData->context.uc_mcontext.rdi;
431 	frame->si = signalFrameData->context.uc_mcontext.rsi;
432 	frame->bp = signalFrameData->context.uc_mcontext.rbp;
433 	frame->r8 = signalFrameData->context.uc_mcontext.r8;
434 	frame->r9 = signalFrameData->context.uc_mcontext.r9;
435 	frame->r10 = signalFrameData->context.uc_mcontext.r10;
436 	frame->r11 = signalFrameData->context.uc_mcontext.r11;
437 	frame->r12 = signalFrameData->context.uc_mcontext.r12;
438 	frame->r13 = signalFrameData->context.uc_mcontext.r13;
439 	frame->r14 = signalFrameData->context.uc_mcontext.r14;
440 	frame->r15 = signalFrameData->context.uc_mcontext.r15;
441 	frame->user_sp = signalFrameData->context.uc_mcontext.rsp;
442 	frame->ip = signalFrameData->context.uc_mcontext.rip;
443 	frame->flags = (frame->flags & ~(uint64)X86_EFLAGS_USER_FLAGS)
450 	frame->fpu = &thread->arch_info.fpu_state;
452 	// The syscall return code overwrites frame->ax with the return value of
455 	return frame->ax;