1 // SPDX-License-Identifier: GPL-2.0
6  *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
7  *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
8  *  2000-2002   x86-64 support by Andi Kleen
25 #include <linux/user-return-notifier.h>
28 #include <linux/entry-common.h>
48 		ksig->ka.sa.sa_flags & SA_IA32_ABI;  in is_ia32_compat_frame()
59 		ksig->ka.sa.sa_flags & SA_X32_ABI;  in is_x32_frame()
66 /* x86 ABI requires 16-byte alignment */
69 #define MAX_FRAME_PADDING	(FRAME_ALIGNMENT - 1)
78 	struct k_sigaction *ka = &ksig->ka;  in get_sigframe()
81 	bool nested_altstack = on_sig_stack(regs->sp);  in get_sigframe()
84 	unsigned long sp = regs->sp;  in get_sigframe()
89 		sp -= 128;  in get_sigframe()
92 	if (ka->sa.sa_flags & SA_ONSTACK) {  in get_sigframe()
95 		 * programs use SS_AUTODISARM, which disables that check, and  in get_sigframe()
96 		 * programs that don't use SS_AUTODISARM get compatible.  in get_sigframe()
99 			sp = current->sas_ss_sp + current->sas_ss_size;  in get_sigframe()
104 		   regs->ss != __USER_DS &&  in get_sigframe()
105 		   !(ka->sa.sa_flags & SA_RESTORER) &&  in get_sigframe()
106 		   ka->sa.sa_restorer) {  in get_sigframe()
108 		sp = (unsigned long) ka->sa.sa_restorer;  in get_sigframe()
115 	sp -= frame_size;  in get_sigframe()
122 		sp = ((sp + 4) & -FRAME_ALIGNMENT) - 4;  in get_sigframe()
124 		sp = round_down(sp, FRAME_ALIGNMENT) - 8;  in get_sigframe()
128 	 * Return an always-bogus address instead so we will die with SIGSEGV.  in get_sigframe()
135 				current->comm, task_pid_nr(current));  in get_sigframe()
137 		return (void __user *)-1L;  in get_sigframe()
142 		return (void __user *)-1L;  in get_sigframe()
150  * -- the largest size. It means the size for 64-bit apps is a bit more
160  * The FP state frame contains an XSAVE buffer which must be 64-byte aligned.
169  * -------------------------
171  * -------------------------
173  * -------------------------
175  * -------------------------
177  * -------------------------
179  * -------------------------
210 	/* Perform fixup for the pre-signal frame. */  in setup_rt_frame()
215 		if (ksig->ka.sa.sa_flags & SA_SIGINFO)  in setup_rt_frame()
230 	struct fpu *fpu = &current->thread.fpu;  in handle_signal()
236 	if (syscall_get_nr(current, regs) != -1) {  in handle_signal()
239 		case -ERESTART_RESTARTBLOCK:  in handle_signal()
240 		case -ERESTARTNOHAND:  in handle_signal()
241 			regs->ax = -EINTR;  in handle_signal()
244 		case -ERESTARTSYS:  in handle_signal()
245 			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {  in handle_signal()
246 				regs->ax = -EINTR;  in handle_signal()
250 		case -ERESTARTNOINTR:  in handle_signal()
251 			regs->ax = regs->orig_ax;  in handle_signal()
252 			regs->ip -= 2;  in handle_signal()
278 		regs->flags &= ~(X86_EFLAGS_DF|X86_EFLAGS_RF|X86_EFLAGS_TF);  in handle_signal()
290 	if (current->restart_block.arch_data & TS_COMPAT)  in get_nr_restart_syscall()
294 	return __NR_restart_syscall | (regs->orig_ax & __X32_SYSCALL_BIT);  in get_nr_restart_syscall()
316 	if (syscall_get_nr(current, regs) != -1) {  in arch_do_signal_or_restart()
317 		/* Restart the system call - no handlers present */  in arch_do_signal_or_restart()
319 		case -ERESTARTNOHAND:  in arch_do_signal_or_restart()
320 		case -ERESTARTSYS:  in arch_do_signal_or_restart()
321 		case -ERESTARTNOINTR:  in arch_do_signal_or_restart()
322 			regs->ax = regs->orig_ax;  in arch_do_signal_or_restart()
323 			regs->ip -= 2;  in arch_do_signal_or_restart()
326 		case -ERESTART_RESTARTBLOCK:  in arch_do_signal_or_restart()
327 			regs->ax = get_nr_restart_syscall(regs);  in arch_do_signal_or_restart()
328 			regs->ip -= 2;  in arch_do_signal_or_restart()
348 		       me->comm, me->pid, where, frame,  in signal_fault()
349 		       regs->ip, regs->sp, regs->orig_ax);  in signal_fault()
350 		print_vma_addr(KERN_CONT " in ", regs->ip);  in signal_fault()
372  * exceeds that size already. As such programs might never use the
381  * permission are checked against the size of the non-dynamic feature set
390 	unsigned long fsize = max_frame_size - fpu_default_state_size;  in sigaltstack_size_valid()
393 	lockdep_assert_held(&current->sighand->siglock);  in sigaltstack_size_valid()
398 	fsize += current->group_leader->thread.fpu.perm.__user_state_size;  in sigaltstack_size_valid()
405 	mask = current->group_leader->thread.fpu.perm.__state_perm;  in sigaltstack_size_valid()