x86/32/thread.cpp

85 x86_restart_syscall(struct iframe* frame)
92 	frame->ax = frame->orig_eax;
93 	frame->dx = frame->orig_edx;
94 	frame->ip -= 2;
125 get_signal_stack(Thread* thread, struct iframe* frame, struct sigaction* action,
131 		&& (frame->user_sp < thread->signal_stack_base
132 			|| frame->user_sp >= thread->signal_stack_base
138 	return (uint8*)((frame->user_sp - spaceNeeded) & ~addr_t(0xf)) - 4;
246 	iframe frame = {};
247 	frame.type = IFRAME_TYPE_SYSCALL;
248 	frame.gs = USER_DATA_SELECTOR;
249 	// frame.fs not used, we call x86_set_tls_context() on context switch
250 	frame.es = USER_DATA_SELECTOR;
251 	frame.ds = USER_DATA_SELECTOR;
252 	frame.ip = entry;
253 	frame.cs = USER_CODE_SELECTOR;
254 	frame.flags = X86_EFLAGS_RESERVED1 | X86_EFLAGS_INTERRUPT;
255 	frame.user_sp = stackTop;
256 	frame.user_ss = USER_DATA_SELECTOR;
259 	x86_initial_return_to_userland(thread, &frame);
273 	"restore signal frame" syscall with the (possibly modified) signal frame
296 	struct iframe *frame = x86_get_current_iframe();
297 	if (!IFRAME_IS_USER(frame)) {
310 	signalFrameData->context.uc_mcontext.eip = frame->ip;
311 	signalFrameData->context.uc_mcontext.eflags = frame->flags;
312 	signalFrameData->context.uc_mcontext.eax = frame->ax;
313 	signalFrameData->context.uc_mcontext.ecx = frame->cx;
314 	signalFrameData->context.uc_mcontext.edx = frame->dx;
315 	signalFrameData->context.uc_mcontext.ebp = frame->bp;
316 	signalFrameData->context.uc_mcontext.esp = frame->user_sp;
317 	signalFrameData->context.uc_mcontext.edi = frame->di;
318 	signalFrameData->context.uc_mcontext.esi = frame->si;
319 	signalFrameData->context.uc_mcontext.ebx = frame->bx;
323 	signal_get_user_stack(frame->user_sp, &signalFrameData->context.uc_stack);
327 		= (uint64)frame->orig_edx << 32 | frame->orig_eax;
332 	uint8* userStack = get_signal_stack(thread, frame, action,
335 	// copy the signal frame data onto the stack
343 	// prepare the user stack frame for a function call to the signal handler
345 	stackFrame[0] = frame->ip;
347 		// parameter: pointer to signal frame data
358 	frame->user_sp = (addr_t)userStack;
359 	frame->ip = x86_get_user_signal_handler_wrapper(
362 	frame->flags &= ~(X86_EFLAGS_TRAP | X86_EFLAGS_DIRECTION);
371 	struct iframe* frame = x86_get_current_iframe();
375 	frame->orig_eax = (uint32)signalFrameData->syscall_restart_return_value;
376 	frame->orig_edx
379 	frame->ip = signalFrameData->context.uc_mcontext.eip;
380 	frame->flags = (frame->flags & ~(uint32)X86_EFLAGS_USER_FLAGS)
382 	frame->ax = signalFrameData->context.uc_mcontext.eax;
383 	frame->cx = signalFrameData->context.uc_mcontext.ecx;
384 	frame->dx = signalFrameData->context.uc_mcontext.edx;
385 	frame->bp = signalFrameData->context.uc_mcontext.ebp;
386 	frame->user_sp = signalFrameData->context.uc_mcontext.esp;
387 	frame->di = signalFrameData->context.uc_mcontext.edi;
388 	frame->si = signalFrameData->context.uc_mcontext.esi;
389 	frame->bx = signalFrameData->context.uc_mcontext.ebx;
395 	return (int64)frame->ax | ((int64)frame->dx << 32);