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hc
2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f 
 kernel/arch/powerpc/lib/checksum_64.S
....@@ -1,13 +1,9 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23  * This file contains assembly-language implementations
34  * of IP-style 1's complement checksum routines.
45  *	
56  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6
- *
7
- *  This program is free software; you can redistribute it and/or
8
- *  modify it under the terms of the GNU General Public License
9
- *  as published by the Free Software Foundation; either version
10
- *  2 of the License, or (at your option) any later version.
117  *
128  * Severely hacked about by Paul Mackerras (paulus@cs.anu.edu.au).
139  */
....@@ -186,34 +182,33 @@
186182 
187183 	.macro srcnr
188184 100:
189
-	EX_TABLE(100b,.Lsrc_error_nr)
185
+	EX_TABLE(100b,.Lerror_nr)
190186 	.endm
191187 
192188 	.macro source
193189 150:
194
-	EX_TABLE(150b,.Lsrc_error)
190
+	EX_TABLE(150b,.Lerror)
195191 	.endm
196192 
197193 	.macro dstnr
198194 200:
199
-	EX_TABLE(200b,.Ldest_error_nr)
195
+	EX_TABLE(200b,.Lerror_nr)
200196 	.endm
201197 
202198 	.macro dest
203199 250:
204
-	EX_TABLE(250b,.Ldest_error)
200
+	EX_TABLE(250b,.Lerror)
205201 	.endm
206202 
207203 /*
208204  * Computes the checksum of a memory block at src, length len,
209
- * and adds in "sum" (32-bit), while copying the block to dst.
210
- * If an access exception occurs on src or dst, it stores -EFAULT
211
- * to *src_err or *dst_err respectively. The caller must take any action
212
- * required in this case (zeroing memory, recalculating partial checksum etc).
205
+ * and adds in 0xffffffff (32-bit), while copying the block to dst.
206
+ * If an access exception occurs, it returns 0.
213207  *
214
- * csum_partial_copy_generic(r3=src, r4=dst, r5=len, r6=sum, r7=src_err, r8=dst_err)
208
+ * csum_partial_copy_generic(r3=src, r4=dst, r5=len)
215209  */
216210 _GLOBAL(csum_partial_copy_generic)
211
+	li	r6,-1
217212 	addic	r0,r6,0			/* clear carry */
218213 
219214 	srdi.	r6,r5,3			/* less than 8 bytes? */
....@@ -405,29 +400,15 @@
405400 	srdi	r3,r3,32
406401 	blr
407402 
408
-.Lsrc_error:
403
+.Lerror:
409404 	ld	r14,STK_REG(R14)(r1)
410405 	ld	r15,STK_REG(R15)(r1)
411406 	ld	r16,STK_REG(R16)(r1)
412407 	addi	r1,r1,STACKFRAMESIZE
413
-.Lsrc_error_nr:
414
-	cmpdi	0,r7,0
415
-	beqlr
416
-	li	r6,-EFAULT
417
-	stw	r6,0(r7)
408
+.Lerror_nr:
409
+	li	r3,0
418410 	blr
419411 
420
-.Ldest_error:
421
-	ld	r14,STK_REG(R14)(r1)
422
-	ld	r15,STK_REG(R15)(r1)
423
-	ld	r16,STK_REG(R16)(r1)
424
-	addi	r1,r1,STACKFRAMESIZE
425
-.Ldest_error_nr:
426
-	cmpdi	0,r8,0
427
-	beqlr
428
-	li	r6,-EFAULT
429
-	stw	r6,0(r8)
430
-	blr
431412 EXPORT_SYMBOL(csum_partial_copy_generic)
432413 
433414 /*