forked from ~ljy/RK356X_SDK_RELEASE

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hc
2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 kernel/arch/alpha/kernel/traps.c
....@@ -121,10 +121,10 @@
121121 }
122122 
123123 static void
124
-dik_show_trace(unsigned long *sp)
124
+dik_show_trace(unsigned long *sp, const char *loglvl)
125125 {
126126 	long i = 0;
127
-	printk("Trace:\n");
127
+	printk("%sTrace:\n", loglvl);
128128 	while (0x1ff8 & (unsigned long) sp) {
129129 		extern char _stext[], _etext[];
130130 		unsigned long tmp = *sp;
....@@ -133,24 +133,24 @@
133133 			continue;
134134 		if (tmp >= (unsigned long) &_etext)
135135 			continue;
136
-		printk("[<%lx>] %pSR\n", tmp, (void *)tmp);
136
+		printk("%s[<%lx>] %pSR\n", loglvl, tmp, (void *)tmp);
137137 		if (i > 40) {
138
-			printk(" ...");
138
+			printk("%s ...", loglvl);
139139 			break;
140140 		}
141141 	}
142
-	printk("\n");
142
+	printk("%s\n", loglvl);
143143 }
144144 
145145 static int kstack_depth_to_print = 24;
146146 
147
-void show_stack(struct task_struct *task, unsigned long *sp)
147
+void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
148148 {
149149 	unsigned long *stack;
150150 	int i;
151151 
152152 	/*
153
-	 * debugging aid: "show_stack(NULL);" prints the
153
+	 * debugging aid: "show_stack(NULL, NULL, KERN_EMERG);" prints the
154154 	 * back trace for this cpu.
155155 	 */
156156 	if(sp==NULL)
....@@ -163,14 +163,14 @@
163163 		if ((i % 4) == 0) {
164164 			if (i)
165165 				pr_cont("\n");
166
-			printk("       ");
166
+			printk("%s       ", loglvl);
167167 		} else {
168168 			pr_cont(" ");
169169 		}
170170 		pr_cont("%016lx", *stack++);
171171 	}
172172 	pr_cont("\n");
173
-	dik_show_trace(sp);
173
+	dik_show_trace(sp, loglvl);
174174 }
175175 
176176 void
....@@ -184,7 +184,7 @@
184184 	printk("%s(%d): %s %ld\n", current->comm, task_pid_nr(current), str, err);
185185 	dik_show_regs(regs, r9_15);
186186 	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
187
-	dik_show_trace((unsigned long *)(regs+1));
187
+	dik_show_trace((unsigned long *)(regs+1), KERN_DEFAULT);
188188 	dik_show_code((unsigned int *)regs->pc);
189189 
190190 	if (test_and_set_thread_flag (TIF_DIE_IF_KERNEL)) {
....@@ -192,7 +192,7 @@
192192 		local_irq_enable();
193193 		while (1);
194194 	}
195
-	do_exit(SIGSEGV);
195
+	make_task_dead(SIGSEGV);
196196 }
197197 
198198 #ifndef CONFIG_MATHEMU
....@@ -235,7 +235,21 @@
235235 {
236236 	int signo, code;
237237 
238
-	if ((regs->ps & ~IPL_MAX) == 0) {
238
+	if (type == 3) { /* FEN fault */
239
+		/* Irritating users can call PAL_clrfen to disable the
240
+		   FPU for the process.  The kernel will then trap in
241
+		   do_switch_stack and undo_switch_stack when we try
242
+		   to save and restore the FP registers.
243
+
244
+		   Given that GCC by default generates code that uses the
245
+		   FP registers, PAL_clrfen is not useful except for DoS
246
+		   attacks.  So turn the bleeding FPU back on and be done
247
+		   with it.  */
248
+		current_thread_info()->pcb.flags |= 1;
249
+		__reload_thread(&current_thread_info()->pcb);
250
+		return;
251
+	}
252
+	if (!user_mode(regs)) {
239253 		if (type == 1) {
240254 			const unsigned int *data
241255 			  = (const unsigned int *) regs->pc;
....@@ -368,20 +382,6 @@
368382 		}
369383 		break;
370384 
371
-	      case 3: /* FEN fault */
372
-		/* Irritating users can call PAL_clrfen to disable the
373
-		   FPU for the process.  The kernel will then trap in
374
-		   do_switch_stack and undo_switch_stack when we try
375
-		   to save and restore the FP registers.
376
-
377
-		   Given that GCC by default generates code that uses the
378
-		   FP registers, PAL_clrfen is not useful except for DoS
379
-		   attacks.  So turn the bleeding FPU back on and be done
380
-		   with it.  */
381
-		current_thread_info()->pcb.flags |= 1;
382
-		__reload_thread(&current_thread_info()->pcb);
383
-		return;
384
-
385385 	      case 5: /* illoc */
386386 	      default: /* unexpected instruction-fault type */
387387 		      ;
....@@ -402,7 +402,7 @@
402402 {
403403 	die_if_kernel("Instruction fault", regs, 0, NULL);
404404 
405
-	force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc, 0, current);
405
+	force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc, 0);
406406 }
407407 
408408 
....@@ -577,7 +577,7 @@
577577 
578578 	printk("Bad unaligned kernel access at %016lx: %p %lx %lu\n",
579579 		pc, va, opcode, reg);
580
-	do_exit(SIGSEGV);
580
+	make_task_dead(SIGSEGV);
581581 
582582 got_exception:
583583 	/* Ok, we caught the exception, but we don't want it.  Is there
....@@ -625,14 +625,14 @@
625625 	printk("gp = %016lx  sp = %p\n", regs->gp, regs+1);
626626 
627627 	dik_show_code((unsigned int *)pc);
628
-	dik_show_trace((unsigned long *)(regs+1));
628
+	dik_show_trace((unsigned long *)(regs+1), KERN_DEFAULT);
629629 
630630 	if (test_and_set_thread_flag (TIF_DIE_IF_KERNEL)) {
631631 		printk("die_if_kernel recursion detected.\n");
632632 		local_irq_enable();
633633 		while (1);
634634 	}
635
-	do_exit(SIGSEGV);
635
+	make_task_dead(SIGSEGV);
636636 }
637637 
638638 /*
....@@ -883,7 +883,7 @@
883883 
884884 	case 0x26: /* sts */
885885 		fake_reg = s_reg_to_mem(alpha_read_fp_reg(reg));
886
-		/* FALLTHRU */
886
+		fallthrough;
887887 
888888 	case 0x2c: /* stl */
889889 		__asm__ __volatile__(
....@@ -911,7 +911,7 @@
911911 
912912 	case 0x27: /* stt */
913913 		fake_reg = alpha_read_fp_reg(reg);
914
-		/* FALLTHRU */
914
+		fallthrough;
915915 
916916 	case 0x2d: /* stq */
917917 		__asm__ __volatile__(
....@@ -957,12 +957,12 @@
957957 		si_code = SEGV_ACCERR;
958958 	else {
959959 		struct mm_struct *mm = current->mm;
960
-		down_read(&mm->mmap_sem);
960
+		mmap_read_lock(mm);
961961 		if (find_vma(mm, (unsigned long)va))
962962 			si_code = SEGV_ACCERR;
963963 		else
964964 			si_code = SEGV_MAPERR;
965
-		up_read(&mm->mmap_sem);
965
+		mmap_read_unlock(mm);
966966 	}
967967 	send_sig_fault(SIGSEGV, si_code, va, 0, current);
968968 	return;