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hc
2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da 
 kernel/arch/sh/lib/checksum.S
....@@ -1,4 +1,6 @@
1
-/* $Id: checksum.S,v 1.10 2001/07/06 13:11:32 gniibe Exp $
1
+/* SPDX-License-Identifier: GPL-2.0+
2
+ *
3
+ * $Id: checksum.S,v 1.10 2001/07/06 13:11:32 gniibe Exp $
24  *
35  * INET		An implementation of the TCP/IP protocol suite for the LINUX
46  *		operating system.  INET is implemented using the  BSD Socket
....@@ -21,11 +23,6 @@
2123  *                   converted to pure assembler
2224  *
2325  * SuperH version:  Copyright (C) 1999  Niibe Yutaka
24
- *
25
- *		This program is free software; you can redistribute it and/or
26
- *		modify it under the terms of the GNU General Public License
27
- *		as published by the Free Software Foundation; either version
28
- *		2 of the License, or (at your option) any later version.
2926  */
3027 
3128 #include <asm/errno.h>
....@@ -176,47 +173,27 @@
176173 	 mov	r6, r0
177174 
178175 /*
179
-unsigned int csum_partial_copy_generic (const char *src, char *dst, int len, 
180
-					int sum, int *src_err_ptr, int *dst_err_ptr)
176
+unsigned int csum_partial_copy_generic (const char *src, char *dst, int len)
181177  */ 
182178 
183179 /*
184
- * Copy from ds while checksumming, otherwise like csum_partial
185
- *
186
- * The macros SRC and DST specify the type of access for the instruction.
187
- * thus we can call a custom exception handler for all access types.
188
- *
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- * FIXME: could someone double-check whether I haven't mixed up some SRC and
190
- *	  DST definitions? It's damn hard to trigger all cases.  I hope I got
191
- *	  them all but there's no guarantee.
180
+ * Copy from ds while checksumming, otherwise like csum_partial with initial
181
+ * sum being ~0U
192182  */
193183 
194
-#define SRC(...)			\
184
+#define EXC(...)			\
195185 	9999: __VA_ARGS__ ;		\
196186 	.section __ex_table, "a";	\
197187 	.long 9999b, 6001f	;	\
198
-	.previous
199
-
200
-#define DST(...)			\
201
-	9999: __VA_ARGS__ ;		\
202
-	.section __ex_table, "a";	\
203
-	.long 9999b, 6002f	;	\
204188 	.previous
205189 
206190 !
207191 ! r4:	const char *SRC
208192 ! r5:	char *DST
209193 ! r6:	int LEN
210
-! r7:	int SUM
211
-!
212
-! on stack:
213
-! int *SRC_ERR_PTR
214
-! int *DST_ERR_PTR
215194 !
216195 ENTRY(csum_partial_copy_generic)
217
-	mov.l	r5,@-r15
218
-	mov.l	r6,@-r15
219
-
196
+	mov	#-1,r7
220197 	mov	#3,r0		! Check src and dest are equally aligned
221198 	mov	r4,r1
222199 	and	r0,r1
....@@ -246,11 +223,11 @@
246223 	clrt
247224 	.align	2
248225 5:
249
-SRC(	mov.b	@r4+,r1 	)
250
-SRC(	mov.b	@r4+,r0		)
226
+EXC(	mov.b	@r4+,r1 	)
227
+EXC(	mov.b	@r4+,r0		)
251228 	extu.b	r1,r1
252
-DST(	mov.b	r1,@r5		)
253
-DST(	mov.b	r0,@(1,r5)	)
229
+EXC(	mov.b	r1,@r5		)
230
+EXC(	mov.b	r0,@(1,r5)	)
254231 	extu.b	r0,r0
255232 	add	#2,r5
256233 
....@@ -279,8 +256,8 @@
279256 	! Handle first two bytes as a special case
280257 	.align	2
281258 1:	
282
-SRC(	mov.w	@r4+,r0		)
283
-DST(	mov.w	r0,@r5		)
259
+EXC(	mov.w	@r4+,r0		)
260
+EXC(	mov.w	r0,@r5		)
284261 	add	#2,r5
285262 	extu.w	r0,r0
286263 	addc	r0,r7
....@@ -295,32 +272,32 @@
295272 	 clrt
296273 	.align	2
297274 1:	
298
-SRC(	mov.l	@r4+,r0		)
299
-SRC(	mov.l	@r4+,r1		)
275
+EXC(	mov.l	@r4+,r0		)
276
+EXC(	mov.l	@r4+,r1		)
300277 	addc	r0,r7
301
-DST(	mov.l	r0,@r5		)
302
-DST(	mov.l	r1,@(4,r5)	)
278
+EXC(	mov.l	r0,@r5		)
279
+EXC(	mov.l	r1,@(4,r5)	)
303280 	addc	r1,r7
304281 
305
-SRC(	mov.l	@r4+,r0		)
306
-SRC(	mov.l	@r4+,r1		)
282
+EXC(	mov.l	@r4+,r0		)
283
+EXC(	mov.l	@r4+,r1		)
307284 	addc	r0,r7
308
-DST(	mov.l	r0,@(8,r5)	)
309
-DST(	mov.l	r1,@(12,r5)	)
285
+EXC(	mov.l	r0,@(8,r5)	)
286
+EXC(	mov.l	r1,@(12,r5)	)
310287 	addc	r1,r7
311288 
312
-SRC(	mov.l	@r4+,r0 	)
313
-SRC(	mov.l	@r4+,r1		)
289
+EXC(	mov.l	@r4+,r0 	)
290
+EXC(	mov.l	@r4+,r1		)
314291 	addc	r0,r7
315
-DST(	mov.l	r0,@(16,r5)	)
316
-DST(	mov.l	r1,@(20,r5)	)
292
+EXC(	mov.l	r0,@(16,r5)	)
293
+EXC(	mov.l	r1,@(20,r5)	)
317294 	addc	r1,r7
318295 
319
-SRC(	mov.l	@r4+,r0		)
320
-SRC(	mov.l	@r4+,r1		)
296
+EXC(	mov.l	@r4+,r0		)
297
+EXC(	mov.l	@r4+,r1		)
321298 	addc	r0,r7
322
-DST(	mov.l	r0,@(24,r5)	)
323
-DST(	mov.l	r1,@(28,r5)	)
299
+EXC(	mov.l	r0,@(24,r5)	)
300
+EXC(	mov.l	r1,@(28,r5)	)
324301 	addc	r1,r7
325302 	add	#32,r5
326303 	movt	r0
....@@ -338,9 +315,9 @@
338315 	 clrt
339316 	shlr2	r6
340317 3:	
341
-SRC(	mov.l	@r4+,r0	)
318
+EXC(	mov.l	@r4+,r0	)
342319 	addc	r0,r7
343
-DST(	mov.l	r0,@r5	)
320
+EXC(	mov.l	r0,@r5	)
344321 	add	#4,r5
345322 	movt	r0
346323 	dt	r6
....@@ -356,8 +333,8 @@
356333 	mov	#2,r1
357334 	cmp/hs	r1,r6
358335 	bf	5f
359
-SRC(	mov.w	@r4+,r0	)
360
-DST(	mov.w	r0,@r5	)
336
+EXC(	mov.w	@r4+,r0	)
337
+EXC(	mov.w	r0,@r5	)
361338 	extu.w	r0,r0
362339 	add	#2,r5
363340 	cmp/eq	r1,r6
....@@ -366,8 +343,8 @@
366343 	shll16	r0
367344 	addc	r0,r7
368345 5:	
369
-SRC(	mov.b	@r4+,r0	)
370
-DST(	mov.b	r0,@r5	)
346
+EXC(	mov.b	@r4+,r0	)
347
+EXC(	mov.b	r0,@r5	)
371348 	extu.b	r0,r0
372349 #ifndef	__LITTLE_ENDIAN__
373350 	shll8	r0
....@@ -376,42 +353,13 @@
376353 	mov	#0,r0
377354 	addc	r0,r7
378355 7:
379
-5000:
380356 
381357 # Exception handler:
382358 .section .fixup, "ax"							
383359 
384360 6001:
385
-	mov.l	@(8,r15),r0			! src_err_ptr
386
-	mov	#-EFAULT,r1
387
-	mov.l	r1,@r0
388
-
389
-	! zero the complete destination - computing the rest
390
-	! is too much work 
391
-	mov.l	@(4,r15),r5		! dst
392
-	mov.l	@r15,r6			! len
393
-	mov	#0,r7
394
-1:	mov.b	r7,@r5
395
-	dt	r6
396
-	bf/s	1b
397
-	 add	#1,r5
398
-	mov.l	8000f,r0
399
-	jmp	@r0
400
-	 nop
401
-	.align	2
402
-8000:	.long	5000b
403
-
404
-6002:
405
-	mov.l	@(12,r15),r0			! dst_err_ptr
406
-	mov	#-EFAULT,r1
407
-	mov.l	r1,@r0
408
-	mov.l	8001f,r0
409
-	jmp	@r0
410
-	 nop
411
-	.align	2
412
-8001:	.long	5000b
413
-
361
+	rts
362
+	 mov	#0,r0
414363 .previous
415
-	add	#8,r15
416364 	rts
417365 	 mov	r7,r0