Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1 | /* |
| 2 | * This file contains assembly-language implementations |
| 3 | * of IP-style 1's complement checksum routines. |
| 4 | * |
| 5 | * 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. |
| 11 | * |
| 12 | * Severely hacked about by Paul Mackerras (paulus@cs.anu.edu.au). |
| 13 | */ |
| 14 | |
| 15 | #include <linux/sys.h> |
| 16 | #include <asm/processor.h> |
| 17 | #include <asm/errno.h> |
| 18 | #include <asm/ppc_asm.h> |
| 19 | |
| 20 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 21 | * Computes the checksum of a memory block at buff, length len, |
| 22 | * and adds in "sum" (32-bit). |
| 23 | * |
Christophe Leroy | 7e39322 | 2016-03-07 18:44:37 +0100 | [diff] [blame] | 24 | * __csum_partial(r3=buff, r4=len, r5=sum) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 25 | */ |
Christophe Leroy | 7e39322 | 2016-03-07 18:44:37 +0100 | [diff] [blame] | 26 | _GLOBAL(__csum_partial) |
Anton Blanchard | 9b83ecb | 2010-08-02 20:08:34 +0000 | [diff] [blame] | 27 | addic r0,r5,0 /* clear carry */ |
| 28 | |
| 29 | srdi. r6,r4,3 /* less than 8 bytes? */ |
| 30 | beq .Lcsum_tail_word |
| 31 | |
| 32 | /* |
| 33 | * If only halfword aligned, align to a double word. Since odd |
| 34 | * aligned addresses should be rare and they would require more |
| 35 | * work to calculate the correct checksum, we ignore that case |
| 36 | * and take the potential slowdown of unaligned loads. |
| 37 | */ |
| 38 | rldicl. r6,r3,64-1,64-2 /* r6 = (r3 & 0x3) >> 1 */ |
| 39 | beq .Lcsum_aligned |
| 40 | |
| 41 | li r7,4 |
| 42 | sub r6,r7,r6 |
| 43 | mtctr r6 |
| 44 | |
| 45 | 1: |
| 46 | lhz r6,0(r3) /* align to doubleword */ |
| 47 | subi r4,r4,2 |
| 48 | addi r3,r3,2 |
| 49 | adde r0,r0,r6 |
| 50 | bdnz 1b |
| 51 | |
| 52 | .Lcsum_aligned: |
| 53 | /* |
| 54 | * We unroll the loop such that each iteration is 64 bytes with an |
| 55 | * entry and exit limb of 64 bytes, meaning a minimum size of |
| 56 | * 128 bytes. |
| 57 | */ |
| 58 | srdi. r6,r4,7 |
| 59 | beq .Lcsum_tail_doublewords /* len < 128 */ |
| 60 | |
| 61 | srdi r6,r4,6 |
| 62 | subi r6,r6,1 |
| 63 | mtctr r6 |
| 64 | |
| 65 | stdu r1,-STACKFRAMESIZE(r1) |
Michael Neuling | c75df6f | 2012-06-25 13:33:10 +0000 | [diff] [blame] | 66 | std r14,STK_REG(R14)(r1) |
| 67 | std r15,STK_REG(R15)(r1) |
| 68 | std r16,STK_REG(R16)(r1) |
Anton Blanchard | 9b83ecb | 2010-08-02 20:08:34 +0000 | [diff] [blame] | 69 | |
| 70 | ld r6,0(r3) |
| 71 | ld r9,8(r3) |
| 72 | |
| 73 | ld r10,16(r3) |
| 74 | ld r11,24(r3) |
| 75 | |
| 76 | /* |
Stewart Smith | ec5619f | 2016-05-23 11:27:01 +1000 | [diff] [blame] | 77 | * On POWER6 and POWER7 back to back adde instructions take 2 cycles |
| 78 | * because of the XER dependency. This means the fastest this loop can |
| 79 | * go is 16 cycles per iteration. The scheduling of the loop below has |
Anton Blanchard | 9b83ecb | 2010-08-02 20:08:34 +0000 | [diff] [blame] | 80 | * been shown to hit this on both POWER6 and POWER7. |
| 81 | */ |
| 82 | .align 5 |
| 83 | 2: |
| 84 | adde r0,r0,r6 |
| 85 | ld r12,32(r3) |
| 86 | ld r14,40(r3) |
| 87 | |
| 88 | adde r0,r0,r9 |
| 89 | ld r15,48(r3) |
| 90 | ld r16,56(r3) |
| 91 | addi r3,r3,64 |
| 92 | |
| 93 | adde r0,r0,r10 |
| 94 | |
| 95 | adde r0,r0,r11 |
| 96 | |
| 97 | adde r0,r0,r12 |
| 98 | |
| 99 | adde r0,r0,r14 |
| 100 | |
| 101 | adde r0,r0,r15 |
| 102 | ld r6,0(r3) |
| 103 | ld r9,8(r3) |
| 104 | |
| 105 | adde r0,r0,r16 |
| 106 | ld r10,16(r3) |
| 107 | ld r11,24(r3) |
| 108 | bdnz 2b |
| 109 | |
| 110 | |
| 111 | adde r0,r0,r6 |
| 112 | ld r12,32(r3) |
| 113 | ld r14,40(r3) |
| 114 | |
| 115 | adde r0,r0,r9 |
| 116 | ld r15,48(r3) |
| 117 | ld r16,56(r3) |
| 118 | addi r3,r3,64 |
| 119 | |
| 120 | adde r0,r0,r10 |
| 121 | adde r0,r0,r11 |
| 122 | adde r0,r0,r12 |
| 123 | adde r0,r0,r14 |
| 124 | adde r0,r0,r15 |
| 125 | adde r0,r0,r16 |
| 126 | |
Michael Neuling | c75df6f | 2012-06-25 13:33:10 +0000 | [diff] [blame] | 127 | ld r14,STK_REG(R14)(r1) |
| 128 | ld r15,STK_REG(R15)(r1) |
| 129 | ld r16,STK_REG(R16)(r1) |
Anton Blanchard | 9b83ecb | 2010-08-02 20:08:34 +0000 | [diff] [blame] | 130 | addi r1,r1,STACKFRAMESIZE |
| 131 | |
| 132 | andi. r4,r4,63 |
| 133 | |
| 134 | .Lcsum_tail_doublewords: /* Up to 127 bytes to go */ |
| 135 | srdi. r6,r4,3 |
| 136 | beq .Lcsum_tail_word |
| 137 | |
| 138 | mtctr r6 |
| 139 | 3: |
| 140 | ld r6,0(r3) |
| 141 | addi r3,r3,8 |
| 142 | adde r0,r0,r6 |
| 143 | bdnz 3b |
| 144 | |
| 145 | andi. r4,r4,7 |
| 146 | |
| 147 | .Lcsum_tail_word: /* Up to 7 bytes to go */ |
| 148 | srdi. r6,r4,2 |
| 149 | beq .Lcsum_tail_halfword |
| 150 | |
| 151 | lwz r6,0(r3) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 152 | addi r3,r3,4 |
Anton Blanchard | 9b83ecb | 2010-08-02 20:08:34 +0000 | [diff] [blame] | 153 | adde r0,r0,r6 |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 154 | subi r4,r4,4 |
Anton Blanchard | 9b83ecb | 2010-08-02 20:08:34 +0000 | [diff] [blame] | 155 | |
| 156 | .Lcsum_tail_halfword: /* Up to 3 bytes to go */ |
| 157 | srdi. r6,r4,1 |
| 158 | beq .Lcsum_tail_byte |
| 159 | |
| 160 | lhz r6,0(r3) |
| 161 | addi r3,r3,2 |
| 162 | adde r0,r0,r6 |
| 163 | subi r4,r4,2 |
| 164 | |
| 165 | .Lcsum_tail_byte: /* Up to 1 byte to go */ |
| 166 | andi. r6,r4,1 |
| 167 | beq .Lcsum_finish |
| 168 | |
| 169 | lbz r6,0(r3) |
| 170 | sldi r9,r6,8 /* Pad the byte out to 16 bits */ |
| 171 | adde r0,r0,r9 |
| 172 | |
| 173 | .Lcsum_finish: |
| 174 | addze r0,r0 /* add in final carry */ |
| 175 | rldicl r4,r0,32,0 /* fold two 32 bit halves together */ |
| 176 | add r3,r4,r0 |
| 177 | srdi r3,r3,32 |
| 178 | blr |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 179 | |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 180 | |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 181 | .macro srcnr |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 182 | 100: |
| 183 | .section __ex_table,"a" |
| 184 | .align 3 |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 185 | .llong 100b,.Lsrc_error_nr |
| 186 | .previous |
| 187 | .endm |
| 188 | |
| 189 | .macro source |
| 190 | 150: |
| 191 | .section __ex_table,"a" |
| 192 | .align 3 |
| 193 | .llong 150b,.Lsrc_error |
| 194 | .previous |
| 195 | .endm |
| 196 | |
| 197 | .macro dstnr |
| 198 | 200: |
| 199 | .section __ex_table,"a" |
| 200 | .align 3 |
| 201 | .llong 200b,.Ldest_error_nr |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 202 | .previous |
| 203 | .endm |
| 204 | |
| 205 | .macro dest |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 206 | 250: |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 207 | .section __ex_table,"a" |
| 208 | .align 3 |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 209 | .llong 250b,.Ldest_error |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 210 | .previous |
| 211 | .endm |
| 212 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 213 | /* |
| 214 | * Computes the checksum of a memory block at src, length len, |
| 215 | * and adds in "sum" (32-bit), while copying the block to dst. |
| 216 | * If an access exception occurs on src or dst, it stores -EFAULT |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 217 | * to *src_err or *dst_err respectively. The caller must take any action |
| 218 | * required in this case (zeroing memory, recalculating partial checksum etc). |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 219 | * |
| 220 | * csum_partial_copy_generic(r3=src, r4=dst, r5=len, r6=sum, r7=src_err, r8=dst_err) |
| 221 | */ |
| 222 | _GLOBAL(csum_partial_copy_generic) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 223 | addic r0,r6,0 /* clear carry */ |
| 224 | |
| 225 | srdi. r6,r5,3 /* less than 8 bytes? */ |
| 226 | beq .Lcopy_tail_word |
| 227 | |
| 228 | /* |
| 229 | * If only halfword aligned, align to a double word. Since odd |
| 230 | * aligned addresses should be rare and they would require more |
| 231 | * work to calculate the correct checksum, we ignore that case |
| 232 | * and take the potential slowdown of unaligned loads. |
| 233 | * |
| 234 | * If the source and destination are relatively unaligned we only |
| 235 | * align the source. This keeps things simple. |
| 236 | */ |
| 237 | rldicl. r6,r3,64-1,64-2 /* r6 = (r3 & 0x3) >> 1 */ |
| 238 | beq .Lcopy_aligned |
| 239 | |
Paul E. McKenney | d9813c3 | 2013-10-01 16:54:05 +1000 | [diff] [blame] | 240 | li r9,4 |
| 241 | sub r6,r9,r6 |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 242 | mtctr r6 |
| 243 | |
| 244 | 1: |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 245 | srcnr; lhz r6,0(r3) /* align to doubleword */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 246 | subi r5,r5,2 |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 247 | addi r3,r3,2 |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 248 | adde r0,r0,r6 |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 249 | dstnr; sth r6,0(r4) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 250 | addi r4,r4,2 |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 251 | bdnz 1b |
| 252 | |
| 253 | .Lcopy_aligned: |
| 254 | /* |
| 255 | * We unroll the loop such that each iteration is 64 bytes with an |
| 256 | * entry and exit limb of 64 bytes, meaning a minimum size of |
| 257 | * 128 bytes. |
| 258 | */ |
| 259 | srdi. r6,r5,7 |
| 260 | beq .Lcopy_tail_doublewords /* len < 128 */ |
| 261 | |
| 262 | srdi r6,r5,6 |
| 263 | subi r6,r6,1 |
| 264 | mtctr r6 |
| 265 | |
| 266 | stdu r1,-STACKFRAMESIZE(r1) |
Michael Neuling | c75df6f | 2012-06-25 13:33:10 +0000 | [diff] [blame] | 267 | std r14,STK_REG(R14)(r1) |
| 268 | std r15,STK_REG(R15)(r1) |
| 269 | std r16,STK_REG(R16)(r1) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 270 | |
| 271 | source; ld r6,0(r3) |
| 272 | source; ld r9,8(r3) |
| 273 | |
| 274 | source; ld r10,16(r3) |
| 275 | source; ld r11,24(r3) |
| 276 | |
| 277 | /* |
Stewart Smith | ec5619f | 2016-05-23 11:27:01 +1000 | [diff] [blame] | 278 | * On POWER6 and POWER7 back to back adde instructions take 2 cycles |
| 279 | * because of the XER dependency. This means the fastest this loop can |
| 280 | * go is 16 cycles per iteration. The scheduling of the loop below has |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 281 | * been shown to hit this on both POWER6 and POWER7. |
| 282 | */ |
| 283 | .align 5 |
| 284 | 2: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 285 | adde r0,r0,r6 |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 286 | source; ld r12,32(r3) |
| 287 | source; ld r14,40(r3) |
| 288 | |
| 289 | adde r0,r0,r9 |
| 290 | source; ld r15,48(r3) |
| 291 | source; ld r16,56(r3) |
| 292 | addi r3,r3,64 |
| 293 | |
| 294 | adde r0,r0,r10 |
| 295 | dest; std r6,0(r4) |
| 296 | dest; std r9,8(r4) |
| 297 | |
| 298 | adde r0,r0,r11 |
| 299 | dest; std r10,16(r4) |
| 300 | dest; std r11,24(r4) |
| 301 | |
| 302 | adde r0,r0,r12 |
| 303 | dest; std r12,32(r4) |
| 304 | dest; std r14,40(r4) |
| 305 | |
| 306 | adde r0,r0,r14 |
| 307 | dest; std r15,48(r4) |
| 308 | dest; std r16,56(r4) |
| 309 | addi r4,r4,64 |
| 310 | |
| 311 | adde r0,r0,r15 |
| 312 | source; ld r6,0(r3) |
| 313 | source; ld r9,8(r3) |
| 314 | |
| 315 | adde r0,r0,r16 |
| 316 | source; ld r10,16(r3) |
| 317 | source; ld r11,24(r3) |
| 318 | bdnz 2b |
| 319 | |
| 320 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 321 | adde r0,r0,r6 |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 322 | source; ld r12,32(r3) |
| 323 | source; ld r14,40(r3) |
| 324 | |
| 325 | adde r0,r0,r9 |
| 326 | source; ld r15,48(r3) |
| 327 | source; ld r16,56(r3) |
| 328 | addi r3,r3,64 |
| 329 | |
| 330 | adde r0,r0,r10 |
| 331 | dest; std r6,0(r4) |
| 332 | dest; std r9,8(r4) |
| 333 | |
| 334 | adde r0,r0,r11 |
| 335 | dest; std r10,16(r4) |
| 336 | dest; std r11,24(r4) |
| 337 | |
| 338 | adde r0,r0,r12 |
| 339 | dest; std r12,32(r4) |
| 340 | dest; std r14,40(r4) |
| 341 | |
| 342 | adde r0,r0,r14 |
| 343 | dest; std r15,48(r4) |
| 344 | dest; std r16,56(r4) |
| 345 | addi r4,r4,64 |
| 346 | |
| 347 | adde r0,r0,r15 |
| 348 | adde r0,r0,r16 |
| 349 | |
Michael Neuling | c75df6f | 2012-06-25 13:33:10 +0000 | [diff] [blame] | 350 | ld r14,STK_REG(R14)(r1) |
| 351 | ld r15,STK_REG(R15)(r1) |
| 352 | ld r16,STK_REG(R16)(r1) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 353 | addi r1,r1,STACKFRAMESIZE |
| 354 | |
| 355 | andi. r5,r5,63 |
| 356 | |
| 357 | .Lcopy_tail_doublewords: /* Up to 127 bytes to go */ |
| 358 | srdi. r6,r5,3 |
| 359 | beq .Lcopy_tail_word |
| 360 | |
| 361 | mtctr r6 |
| 362 | 3: |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 363 | srcnr; ld r6,0(r3) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 364 | addi r3,r3,8 |
| 365 | adde r0,r0,r6 |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 366 | dstnr; std r6,0(r4) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 367 | addi r4,r4,8 |
| 368 | bdnz 3b |
| 369 | |
| 370 | andi. r5,r5,7 |
| 371 | |
| 372 | .Lcopy_tail_word: /* Up to 7 bytes to go */ |
| 373 | srdi. r6,r5,2 |
| 374 | beq .Lcopy_tail_halfword |
| 375 | |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 376 | srcnr; lwz r6,0(r3) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 377 | addi r3,r3,4 |
| 378 | adde r0,r0,r6 |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 379 | dstnr; stw r6,0(r4) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 380 | addi r4,r4,4 |
| 381 | subi r5,r5,4 |
| 382 | |
| 383 | .Lcopy_tail_halfword: /* Up to 3 bytes to go */ |
| 384 | srdi. r6,r5,1 |
| 385 | beq .Lcopy_tail_byte |
| 386 | |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 387 | srcnr; lhz r6,0(r3) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 388 | addi r3,r3,2 |
| 389 | adde r0,r0,r6 |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 390 | dstnr; sth r6,0(r4) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 391 | addi r4,r4,2 |
| 392 | subi r5,r5,2 |
| 393 | |
| 394 | .Lcopy_tail_byte: /* Up to 1 byte to go */ |
| 395 | andi. r6,r5,1 |
| 396 | beq .Lcopy_finish |
| 397 | |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 398 | srcnr; lbz r6,0(r3) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 399 | sldi r9,r6,8 /* Pad the byte out to 16 bits */ |
| 400 | adde r0,r0,r9 |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 401 | dstnr; stb r6,0(r4) |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 402 | |
| 403 | .Lcopy_finish: |
| 404 | addze r0,r0 /* add in final carry */ |
| 405 | rldicl r4,r0,32,0 /* fold two 32 bit halves together */ |
| 406 | add r3,r4,r0 |
| 407 | srdi r3,r3,32 |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 408 | blr |
| 409 | |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 410 | .Lsrc_error: |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 411 | ld r14,STK_REG(R14)(r1) |
| 412 | ld r15,STK_REG(R15)(r1) |
| 413 | ld r16,STK_REG(R16)(r1) |
| 414 | addi r1,r1,STACKFRAMESIZE |
| 415 | .Lsrc_error_nr: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 416 | cmpdi 0,r7,0 |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 417 | beqlr |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 418 | li r6,-EFAULT |
| 419 | stw r6,0(r7) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 420 | blr |
| 421 | |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 422 | .Ldest_error: |
Paul E. McKenney | 8f21bd0 | 2013-10-01 17:11:35 +1000 | [diff] [blame] | 423 | ld r14,STK_REG(R14)(r1) |
| 424 | ld r15,STK_REG(R15)(r1) |
| 425 | ld r16,STK_REG(R16)(r1) |
| 426 | addi r1,r1,STACKFRAMESIZE |
| 427 | .Ldest_error_nr: |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 428 | cmpdi 0,r8,0 |
Anton Blanchard | fdd374b | 2010-08-02 20:09:52 +0000 | [diff] [blame] | 429 | beqlr |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 430 | li r6,-EFAULT |
| 431 | stw r6,0(r8) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 432 | blr |