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2024-05-16 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb 
 kernel/arch/powerpc/kernel/signal_32.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
34  *
....@@ -10,11 +11,6 @@
1011  *  Derived from "arch/i386/kernel/signal.c"
1112  *    Copyright (C) 1991, 1992 Linus Torvalds
1213  *    1997-11-28  Modified for POSIX.1b signals by Richard Henderson
13
- *
14
- *  This program is free software; you can redistribute it and/or
15
- *  modify it under the terms of the GNU General Public License
16
- *  as published by the Free Software Foundation; either version
17
- *  2 of the License, or (at your option) any later version.
1814  */
1915 
2016 #include <linux/sched.h>
....@@ -51,7 +47,6 @@
5147 #include <asm/unistd.h>
5248 #else
5349 #include <asm/ucontext.h>
54
-#include <asm/pgtable.h>
5550 #endif
5651 
5752 #include "signal.h"
....@@ -107,22 +102,18 @@
107102 		struct mcontext __user *frame)
108103 {
109104 	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
110
-	int i;
111
-	/* Force usr to alway see softe as 1 (interrupts enabled) */
112
-	elf_greg_t64 softe = 0x1;
105
+	int val, i;
113106 
114107 	WARN_ON(!FULL_REGS(regs));
115108 
116109 	for (i = 0; i <= PT_RESULT; i ++) {
117
-		if (i == 14 && !FULL_REGS(regs))
118
-			i = 32;
119
-		if ( i == PT_SOFTE) {
120
-			if(__put_user((unsigned int)softe, &frame->mc_gregs[i]))
121
-				return -EFAULT;
122
-			else
123
-				continue;
124
-		}
125
-		if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
110
+		/* Force usr to alway see softe as 1 (interrupts enabled) */
111
+		if (i == PT_SOFTE)
112
+			val = 1;
113
+		else
114
+			val = gregs[i];
115
+
116
+		if (__put_user(val, &frame->mc_gregs[i]))
126117 			return -EFAULT;
127118 	}
128119 	return 0;
....@@ -239,146 +230,6 @@
239230 	int			abigap[56];
240231 };
241232 
242
-#ifdef CONFIG_VSX
243
-unsigned long copy_fpr_to_user(void __user *to,
244
-			       struct task_struct *task)
245
-{
246
-	u64 buf[ELF_NFPREG];
247
-	int i;
248
-
249
-	/* save FPR copy to local buffer then write to the thread_struct */
250
-	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
251
-		buf[i] = task->thread.TS_FPR(i);
252
-	buf[i] = task->thread.fp_state.fpscr;
253
-	return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
254
-}
255
-
256
-unsigned long copy_fpr_from_user(struct task_struct *task,
257
-				 void __user *from)
258
-{
259
-	u64 buf[ELF_NFPREG];
260
-	int i;
261
-
262
-	if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
263
-		return 1;
264
-	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
265
-		task->thread.TS_FPR(i) = buf[i];
266
-	task->thread.fp_state.fpscr = buf[i];
267
-
268
-	return 0;
269
-}
270
-
271
-unsigned long copy_vsx_to_user(void __user *to,
272
-			       struct task_struct *task)
273
-{
274
-	u64 buf[ELF_NVSRHALFREG];
275
-	int i;
276
-
277
-	/* save FPR copy to local buffer then write to the thread_struct */
278
-	for (i = 0; i < ELF_NVSRHALFREG; i++)
279
-		buf[i] = task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
280
-	return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
281
-}
282
-
283
-unsigned long copy_vsx_from_user(struct task_struct *task,
284
-				 void __user *from)
285
-{
286
-	u64 buf[ELF_NVSRHALFREG];
287
-	int i;
288
-
289
-	if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
290
-		return 1;
291
-	for (i = 0; i < ELF_NVSRHALFREG ; i++)
292
-		task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
293
-	return 0;
294
-}
295
-
296
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
297
-unsigned long copy_ckfpr_to_user(void __user *to,
298
-				  struct task_struct *task)
299
-{
300
-	u64 buf[ELF_NFPREG];
301
-	int i;
302
-
303
-	/* save FPR copy to local buffer then write to the thread_struct */
304
-	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
305
-		buf[i] = task->thread.TS_CKFPR(i);
306
-	buf[i] = task->thread.ckfp_state.fpscr;
307
-	return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
308
-}
309
-
310
-unsigned long copy_ckfpr_from_user(struct task_struct *task,
311
-					  void __user *from)
312
-{
313
-	u64 buf[ELF_NFPREG];
314
-	int i;
315
-
316
-	if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
317
-		return 1;
318
-	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
319
-		task->thread.TS_CKFPR(i) = buf[i];
320
-	task->thread.ckfp_state.fpscr = buf[i];
321
-
322
-	return 0;
323
-}
324
-
325
-unsigned long copy_ckvsx_to_user(void __user *to,
326
-				  struct task_struct *task)
327
-{
328
-	u64 buf[ELF_NVSRHALFREG];
329
-	int i;
330
-
331
-	/* save FPR copy to local buffer then write to the thread_struct */
332
-	for (i = 0; i < ELF_NVSRHALFREG; i++)
333
-		buf[i] = task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
334
-	return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
335
-}
336
-
337
-unsigned long copy_ckvsx_from_user(struct task_struct *task,
338
-					  void __user *from)
339
-{
340
-	u64 buf[ELF_NVSRHALFREG];
341
-	int i;
342
-
343
-	if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
344
-		return 1;
345
-	for (i = 0; i < ELF_NVSRHALFREG ; i++)
346
-		task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
347
-	return 0;
348
-}
349
-#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
350
-#else
351
-inline unsigned long copy_fpr_to_user(void __user *to,
352
-				      struct task_struct *task)
353
-{
354
-	return __copy_to_user(to, task->thread.fp_state.fpr,
355
-			      ELF_NFPREG * sizeof(double));
356
-}
357
-
358
-inline unsigned long copy_fpr_from_user(struct task_struct *task,
359
-					void __user *from)
360
-{
361
-	return __copy_from_user(task->thread.fp_state.fpr, from,
362
-			      ELF_NFPREG * sizeof(double));
363
-}
364
-
365
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
366
-inline unsigned long copy_ckfpr_to_user(void __user *to,
367
-					 struct task_struct *task)
368
-{
369
-	return __copy_to_user(to, task->thread.ckfp_state.fpr,
370
-			      ELF_NFPREG * sizeof(double));
371
-}
372
-
373
-inline unsigned long copy_ckfpr_from_user(struct task_struct *task,
374
-						 void __user *from)
375
-{
376
-	return __copy_from_user(task->thread.ckfp_state.fpr, from,
377
-				ELF_NFPREG * sizeof(double));
378
-}
379
-#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
380
-#endif
381
-
382233 /*
383234  * Save the current user registers on the user stack.
384235  * We only save the altivec/spe registers if the process has used
....@@ -470,9 +321,9 @@
470321 		return 1;
471322 
472323 	if (sigret) {
473
-		/* Set up the sigreturn trampoline: li r0,sigret; sc */
474
-		if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
475
-		    || __put_user(0x44000002UL, &frame->tramp[1]))
324
+		/* Set up the sigreturn trampoline: li 0,sigret; sc */
325
+		if (__put_user(PPC_INST_ADDI + sigret, &frame->tramp[0])
326
+		    || __put_user(PPC_INST_SC, &frame->tramp[1]))
476327 			return 1;
477328 		flush_icache_range((unsigned long) &frame->tramp[0],
478329 				   (unsigned long) &frame->tramp[2]);
....@@ -611,9 +462,9 @@
611462 	if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
612463 		return 1;
613464 	if (sigret) {
614
-		/* Set up the sigreturn trampoline: li r0,sigret; sc */
615
-		if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
616
-		    || __put_user(0x44000002UL, &frame->tramp[1]))
465
+		/* Set up the sigreturn trampoline: li 0,sigret; sc */
466
+		if (__put_user(PPC_INST_ADDI + sigret, &frame->tramp[0])
467
+		    || __put_user(PPC_INST_SC, &frame->tramp[1]))
617468 			return 1;
618469 		flush_icache_range((unsigned long) &frame->tramp[0],
619470 				   (unsigned long) &frame->tramp[2]);
....@@ -644,7 +495,7 @@
644495 	if (!sig)
645496 		save_r2 = (unsigned int)regs->gpr[2];
646497 	err = restore_general_regs(regs, sr);
647
-	regs->trap = 0;
498
+	set_trap_norestart(regs);
648499 	err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
649500 	if (!sig)
650501 		regs->gpr[2] = (unsigned long) save_r2;
....@@ -1013,7 +864,7 @@
1013864 #else
1014865 	if (__get_user(mcp, &ucp->uc_regs))
1015866 		return -EFAULT;
1016
-	if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
867
+	if (!access_ok(mcp, sizeof(*mcp)))
1017868 		return -EFAULT;
1018869 #endif
1019870 	set_current_blocked(&set);
....@@ -1116,7 +967,7 @@
1116967 		 */
1117968 		mctx = (struct mcontext __user *)
1118969 			((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
1119
-		if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size)
970
+		if (!access_ok(old_ctx, ctx_size)
1120971 		    || save_user_regs(regs, mctx, NULL, 0, ctx_has_vsx_region)
1121972 		    || put_sigset_t(&old_ctx->uc_sigmask, &current->blocked)
1122973 		    || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
....@@ -1124,7 +975,7 @@
1124975 	}
1125976 	if (new_ctx == NULL)
1126977 		return 0;
1127
-	if (!access_ok(VERIFY_READ, new_ctx, ctx_size) ||
978
+	if (!access_ok(new_ctx, ctx_size) ||
1128979 	    fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
1129980 		return -EFAULT;
1130981 
....@@ -1154,18 +1005,18 @@
11541005 {
11551006 	struct rt_sigframe __user *rt_sf;
11561007 	struct pt_regs *regs = current_pt_regs();
1008
+	int tm_restore = 0;
11571009 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
11581010 	struct ucontext __user *uc_transact;
11591011 	unsigned long msr_hi;
11601012 	unsigned long tmp;
1161
-	int tm_restore = 0;
11621013 #endif
11631014 	/* Always make any pending restarted system calls return -EINTR */
11641015 	current->restart_block.fn = do_no_restart_syscall;
11651016 
11661017 	rt_sf = (struct rt_sigframe __user *)
11671018 		(regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
1168
-	if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
1019
+	if (!access_ok(rt_sf, sizeof(*rt_sf)))
11691020 		goto bad;
11701021 
11711022 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
....@@ -1209,11 +1060,19 @@
12091060 				goto bad;
12101061 		}
12111062 	}
1212
-	if (!tm_restore)
1213
-		/* Fall through, for non-TM restore */
1063
+	if (!tm_restore) {
1064
+		/*
1065
+		 * Unset regs->msr because ucontext MSR TS is not
1066
+		 * set, and recheckpoint was not called. This avoid
1067
+		 * hitting a TM Bad thing at RFID
1068
+		 */
1069
+		regs->msr &= ~MSR_TS_MASK;
1070
+	}
1071
+	/* Fall through, for non-TM restore */
12141072 #endif
1215
-	if (do_setcontext(&rt_sf->uc, regs, 1))
1216
-		goto bad;
1073
+	if (!tm_restore)
1074
+		if (do_setcontext(&rt_sf->uc, regs, 1))
1075
+			goto bad;
12171076 
12181077 	/*
12191078 	 * It's not clear whether or why it is desirable to save the
....@@ -1240,7 +1099,7 @@
12401099 				   current->comm, current->pid,
12411100 				   rt_sf, regs->nip, regs->link);
12421101 
1243
-	force_sig(SIGSEGV, current);
1102
+	force_sig(SIGSEGV);
12441103 	return 0;
12451104 }
12461105 
....@@ -1306,7 +1165,7 @@
13061165 	current->thread.debug.dbcr0 = new_dbcr0;
13071166 #endif
13081167 
1309
-	if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) ||
1168
+	if (!access_ok(ctx, sizeof(*ctx)) ||
13101169 	    fault_in_pages_readable((u8 __user *)ctx, sizeof(*ctx)))
13111170 		return -EFAULT;
13121171 
....@@ -1329,7 +1188,7 @@
13291188 					   current->comm, current->pid,
13301189 					   ctx, regs->nip, regs->link);
13311190 
1332
-		force_sig(SIGSEGV, current);
1191
+		force_sig(SIGSEGV);
13331192 		goto out;
13341193 	}
13351194 
....@@ -1495,7 +1354,7 @@
14951354 	{
14961355 		sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
14971356 		addr = sr;
1498
-		if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
1357
+		if (!access_ok(sr, sizeof(*sr))
14991358 		    || restore_user_regs(regs, sr, 1))
15001359 			goto badframe;
15011360 	}
....@@ -1511,6 +1370,6 @@
15111370 				   current->comm, current->pid,
15121371 				   addr, regs->nip, regs->link);
15131372 
1514
-	force_sig(SIGSEGV, current);
1373
+	force_sig(SIGSEGV);
15151374 	return 0;
15161375 }