disable pwm7

hc

2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a

 kernel/arch/x86/kernel/module.c
..
..
@@ -1,19 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
1
2
 /*  Kernel module help for x86.
2
3
     Copyright (C) 2001 Rusty Russell.
3
4
 
4
-    This program is free software; you can redistribute it and/or modify
5
-    it under the terms of the GNU General Public License as published by
6
-    the Free Software Foundation; either version 2 of the License, or
7
-    (at your option) any later version.
8
-
9
-    This program is distributed in the hope that it will be useful,
10
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
11
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
-    GNU General Public License for more details.
13
-
14
-    You should have received a copy of the GNU General Public License
15
-    along with this program; if not, write to the Free Software
16
-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17
5
 */
18
6
 
19
7
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
..
..
@@ -30,10 +18,10 @@
30
18
 #include <linux/gfp.h>
31
19
 #include <linux/jump_label.h>
32
20
 #include <linux/random.h>
21
+#include <linux/memory.h>
33
22
 
34
23
 #include <asm/text-patching.h>
35
24
 #include <asm/page.h>
36
-#include <asm/pgtable.h>
37
25
 #include <asm/setup.h>
38
26
 #include <asm/unwind.h>
39
27
 
..
..
@@ -139,11 +127,12 @@
139
127
 	return 0;
140
128
 }
141
129
 #else /*X86_64*/
142
-int apply_relocate_add(Elf64_Shdr *sechdrs,
130
+static int __apply_relocate_add(Elf64_Shdr *sechdrs,
143
131
 		   const char *strtab,
144
132
 		   unsigned int symindex,
145
133
 		   unsigned int relsec,
146
-		   struct module *me)
134
+		   struct module *me,
135
+		   void *(*write)(void *dest, const void *src, size_t len))
147
136
 {
148
137
 	unsigned int i;
149
138
 	Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
..
..
@@ -175,19 +164,19 @@
175
164
 		case R_X86_64_64:
176
165
 			if (*(u64 *)loc != 0)
177
166
 				goto invalid_relocation;
178
-			*(u64 *)loc = val;
167
+			write(loc, &val, 8);
179
168
 			break;
180
169
 		case R_X86_64_32:
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170
 			if (*(u32 *)loc != 0)
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171
 				goto invalid_relocation;
183
-			*(u32 *)loc = val;
172
+			write(loc, &val, 4);
184
173
 			if (val != *(u32 *)loc)
185
174
 				goto overflow;
186
175
 			break;
187
176
 		case R_X86_64_32S:
188
177
 			if (*(s32 *)loc != 0)
189
178
 				goto invalid_relocation;
190
-			*(s32 *)loc = val;
179
+			write(loc, &val, 4);
191
180
 			if ((s64)val != *(s32 *)loc)
192
181
 				goto overflow;
193
182
 			break;
..
..
@@ -196,11 +185,17 @@
196
185
 			if (*(u32 *)loc != 0)
197
186
 				goto invalid_relocation;
198
187
 			val -= (u64)loc;
199
-			*(u32 *)loc = val;
188
+			write(loc, &val, 4);
200
189
 #if 0
201
190
 			if ((s64)val != *(s32 *)loc)
202
191
 				goto overflow;
203
192
 #endif
193
+			break;
194
+		case R_X86_64_PC64:
195
+			if (*(u64 *)loc != 0)
196
+				goto invalid_relocation;
197
+			val -= (u64)loc;
198
+			write(loc, &val, 8);
204
199
 			break;
205
200
 		case R_X86_64_8:
206
201
 			if (!strncmp(strtab + sym->st_name, "__typeid__", 10))
..
..
@@ -226,6 +221,33 @@
226
221
 	       me->name);
227
222
 	return -ENOEXEC;
228
223
 }
224
+
225
+int apply_relocate_add(Elf64_Shdr *sechdrs,
226
+		   const char *strtab,
227
+		   unsigned int symindex,
228
+		   unsigned int relsec,
229
+		   struct module *me)
230
+{
231
+	int ret;
232
+	bool early = me->state == MODULE_STATE_UNFORMED;
233
+	void *(*write)(void *, const void *, size_t) = memcpy;
234
+
235
+	if (!early) {
236
+		write = text_poke;
237
+		mutex_lock(&text_mutex);
238
+	}
239
+
240
+	ret = __apply_relocate_add(sechdrs, strtab, symindex, relsec, me,
241
+				   write);
242
+
243
+	if (!early) {
244
+		text_poke_sync();
245
+		mutex_unlock(&text_mutex);
246
+	}
247
+
248
+	return ret;
249
+}
250
+
229
251
 #endif
230
252
 
231
253
 int module_finalize(const Elf_Ehdr *hdr,
..
..
@@ -233,7 +255,8 @@
233
255
 		    struct module *me)
234
256
 {
235
257
 	const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,
236
-		*para = NULL, *orc = NULL, *orc_ip = NULL;
258
+		*para = NULL, *orc = NULL, *orc_ip = NULL,
259
+		*retpolines = NULL, *returns = NULL;
237
260
 	char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
238
261
 
239
262
 	for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
..
..
@@ -249,8 +272,20 @@
249
272
 			orc = s;
250
273
 		if (!strcmp(".orc_unwind_ip", secstrings + s->sh_name))
251
274
 			orc_ip = s;
275
+		if (!strcmp(".retpoline_sites", secstrings + s->sh_name))
276
+			retpolines = s;
277
+		if (!strcmp(".return_sites", secstrings + s->sh_name))
278
+			returns = s;
252
279
 	}
253
280
 
281
+	if (retpolines) {
282
+		void *rseg = (void *)retpolines->sh_addr;
283
+		apply_retpolines(rseg, rseg + retpolines->sh_size);
284
+	}
285
+	if (returns) {
286
+		void *rseg = (void *)returns->sh_addr;
287
+		apply_returns(rseg, rseg + returns->sh_size);
288
+	}
254
289
 	if (alt) {
255
290
 		/* patch .altinstructions */
256
291
 		void *aseg = (void *)alt->sh_addr;