x86/32/thread.cpp

84 x86_restart_syscall(struct iframe* frame)
91 	frame->ax = frame->orig_eax;
92 	frame->dx = frame->orig_edx;
93 	frame->ip -= 2;
112 get_signal_stack(Thread* thread, struct iframe* frame, struct sigaction* action)
117 		&& (frame->user_sp < thread->signal_stack_base
118 			|| frame->user_sp >= thread->signal_stack_base
123 	return (uint8*)frame->user_sp;
233 	iframe frame = {};
234 	frame.type = IFRAME_TYPE_SYSCALL;
235 	frame.gs = USER_DATA_SEG;
236 	// frame.fs not used, we call x86_set_tls_context() on context switch
237 	frame.es = USER_DATA_SEG;
238 	frame.ds = USER_DATA_SEG;
239 	frame.ip = entry;
240 	frame.cs = USER_CODE_SEG;
241 	frame.flags = X86_EFLAGS_RESERVED1 | X86_EFLAGS_INTERRUPT
243 	frame.user_sp = stackTop;
244 	frame.user_ss = USER_DATA_SEG;
247 	x86_initial_return_to_userland(thread, &frame);
261 	"restore signal frame" syscall with the (possibly modified) signal frame
284 	struct iframe *frame = x86_get_current_iframe();
285 	if (!IFRAME_IS_USER(frame)) {
298 	signalFrameData->context.uc_mcontext.eip = frame->ip;
299 	signalFrameData->context.uc_mcontext.eflags = frame->flags;
300 	signalFrameData->context.uc_mcontext.eax = frame->ax;
301 	signalFrameData->context.uc_mcontext.ecx = frame->cx;
302 	signalFrameData->context.uc_mcontext.edx = frame->dx;
303 	signalFrameData->context.uc_mcontext.ebp = frame->bp;
304 	signalFrameData->context.uc_mcontext.esp = frame->user_sp;
305 	signalFrameData->context.uc_mcontext.edi = frame->di;
306 	signalFrameData->context.uc_mcontext.esi = frame->si;
307 	signalFrameData->context.uc_mcontext.ebx = frame->bx;
311 	signal_get_user_stack(frame->user_sp, &signalFrameData->context.uc_stack);
315 		= (uint64)frame->orig_edx << 32 | frame->orig_eax;
319 	uint8* userStack = get_signal_stack(thread, frame, action);
321 	// copy the signal frame data onto the stack
329 	// prepare the user stack frame for a function call to the signal handler
332 		frame->ip,		// return address
333 		(addr_t)userSignalFrameData, // parameter: pointer to signal frame data
346 	frame->user_sp = (addr_t)userStack;
347 	frame->ip = x86_get_user_signal_handler_wrapper(
357 	struct iframe* frame = x86_get_current_iframe();
361 	frame->orig_eax = (uint32)signalFrameData->syscall_restart_return_value;
362 	frame->orig_edx
365 	frame->ip = signalFrameData->context.uc_mcontext.eip;
366 	frame->flags = (frame->flags & ~(uint32)X86_EFLAGS_USER_FLAGS)
368 	frame->ax = signalFrameData->context.uc_mcontext.eax;
369 	frame->cx = signalFrameData->context.uc_mcontext.ecx;
370 	frame->dx = signalFrameData->context.uc_mcontext.edx;
371 	frame->bp = signalFrameData->context.uc_mcontext.ebp;
372 	frame->user_sp = signalFrameData->context.uc_mcontext.esp;
373 	frame->di = signalFrameData->context.uc_mcontext.edi;
374 	frame->si = signalFrameData->context.uc_mcontext.esi;
375 	frame->bx = signalFrameData->context.uc_mcontext.ebx;
381 	return (int64)frame->ax | ((int64)frame->dx << 32);