x86/kernel/signal_64.c

24  * If regs->ss will cause an IRET fault, change it.  Otherwise leave it
26  * user_64bit_mode(regs) would return true.
28 static void force_valid_ss(struct pt_regs *regs)
36 		      : [old_ss] "rm" ((u16)regs->ss));
47 		regs->ss = __USER_DS;
50 static bool restore_sigcontext(struct pt_regs *regs,
62 	regs->bx = sc.bx;
63 	regs->cx = sc.cx;
64 	regs->dx = sc.dx;
65 	regs->si = sc.si;
66 	regs->di = sc.di;
67 	regs->bp = sc.bp;
68 	regs->ax = sc.ax;
69 	regs->sp = sc.sp;
70 	regs->ip = sc.ip;
71 	regs->r8 = sc.r8;
72 	regs->r9 = sc.r9;
73 	regs->r10 = sc.r10;
74 	regs->r11 = sc.r11;
75 	regs->r12 = sc.r12;
76 	regs->r13 = sc.r13;
77 	regs->r14 = sc.r14;
78 	regs->r15 = sc.r15;
81 	regs->cs = sc.cs | 0x03;
82 	regs->ss = sc.ss | 0x03;
84 	regs->flags = (regs->flags & ~FIX_EFLAGS) | (sc.flags & FIX_EFLAGS);
86 	regs->orig_ax = -1;
92 	if (unlikely(!(uc_flags & UC_STRICT_RESTORE_SS) && user_64bit_mode(regs)))
93 		force_valid_ss(regs);
100 		     struct pt_regs *regs, unsigned long mask)
102 	unsafe_put_user(regs->di, &sc->di, Efault);
103 	unsafe_put_user(regs->si, &sc->si, Efault);
104 	unsafe_put_user(regs->bp, &sc->bp, Efault);
105 	unsafe_put_user(regs->sp, &sc->sp, Efault);
106 	unsafe_put_user(regs->bx, &sc->bx, Efault);
107 	unsafe_put_user(regs->dx, &sc->dx, Efault);
108 	unsafe_put_user(regs->cx, &sc->cx, Efault);
109 	unsafe_put_user(regs->ax, &sc->ax, Efault);
110 	unsafe_put_user(regs->r8, &sc->r8, Efault);
111 	unsafe_put_user(regs->r9, &sc->r9, Efault);
112 	unsafe_put_user(regs->r10, &sc->r10, Efault);
113 	unsafe_put_user(regs->r11, &sc->r11, Efault);
114 	unsafe_put_user(regs->r12, &sc->r12, Efault);
115 	unsafe_put_user(regs->r13, &sc->r13, Efault);
116 	unsafe_put_user(regs->r14, &sc->r14, Efault);
117 	unsafe_put_user(regs->r15, &sc->r15, Efault);
121 	unsafe_put_user(regs->ip, &sc->ip, Efault);
122 	unsafe_put_user(regs->flags, &sc->flags, Efault);
123 	unsafe_put_user(regs->cs, &sc->cs, Efault);
126 	unsafe_put_user(regs->ss, &sc->ss, Efault);
138 #define unsafe_put_sigcontext(sc, fp, regs, set, label)			\
140 	if (__unsafe_setup_sigcontext(sc, fp, regs, set->sig[0]))	\
149 static unsigned long frame_uc_flags(struct pt_regs *regs)
158 	if (likely(user_64bit_mode(regs)))
164 int x64_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
175 	frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe), &fp);
176 	uc_flags = frame_uc_flags(regs);
184 	unsafe_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
189 	unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
202 	regs->di = ksig->sig;
204 	regs->ax = 0;
208 	regs->si = (unsigned long)&frame->info;
209 	regs->dx = (unsigned long)&frame->uc;
210 	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
212 	regs->sp = (unsigned long)frame;
231 	regs->cs = __USER_CS;
233 	if (unlikely(regs->ss != __USER_DS))
234 		force_valid_ss(regs);
248 	struct pt_regs *regs = current_pt_regs();
253 	frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
263 	if (!restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
272 	return regs->ax;
275 	signal_fault(regs, frame, "rt_sigreturn");
303 int x32_setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
314 	frame = get_sigframe(ksig, regs, sizeof(*frame), &fp);
316 	uc_flags = frame_uc_flags(regs);
327 	unsafe_compat_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
331 	unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
341 	regs->sp = (unsigned long) frame;
342 	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
345 	regs->di = ksig->sig;
346 	regs->si = (unsigned long) &frame->info;
347 	regs->dx = (unsigned long) &frame->uc;
352 	regs->cs = __USER_CS;
353 	regs->ss = __USER_DS;
364 	struct pt_regs *regs = current_pt_regs();
369 	frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
380 	if (!restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
389 	return regs->ax;
392 	signal_fault(regs, frame, "x32 rt_sigreturn");