1 /* Copyright (C) 2006, 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 Contributed by MontaVista Software, Inc. (written by Nicolas Pitre)
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library. If not, see
18 <http://www.gnu.org/licenses/>. */
23 * Data preload for architectures that support it (ARM V5TE and above)
25 #if (!defined (__ARM_ARCH_2__) && !defined (__ARM_ARCH_3__) \
26 && !defined (__ARM_ARCH_3M__) && !defined (__ARM_ARCH_4__) \
27 && !defined (__ARM_ARCH_4T__) && !defined (__ARM_ARCH_5__) \
28 && !defined (__ARM_ARCH_5T__))
29 #define PLD(code...) code
35 * This can be used to enable code to cacheline align the source pointer.
36 * Experiments on tested architectures (StrongARM and XScale) didn't show
37 * this a worthwhile thing to do. That might be different in the future.
39 //#define CALGN(code...) code
40 #define CALGN(code...)
43 * Endian independent macros for shifting bytes within registers.
55 /* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
59 stmfd sp!, {r0, r4, lr}
60 cfi_adjust_cfa_offset (12)
61 cfi_rel_offset (r4, 4)
62 cfi_rel_offset (lr, 8)
76 cfi_adjust_cfa_offset (16)
77 cfi_rel_offset (r5, 0)
78 cfi_rel_offset (r6, 4)
79 cfi_rel_offset (r7, 8)
80 cfi_rel_offset (r8, 12)
83 CALGN( ands ip, r1, #31 )
84 CALGN( rsb r3, ip, #32 )
85 CALGN( sbcnes r4, r3, r2 ) @ C is always set here
88 CALGN( subs r2, r2, r3 ) @ C gets set
89 CALGN( add pc, r4, ip )
92 2: PLD( subs r2, r2, #96 )
98 3: PLD( pld [r1, #124] )
99 4: ldmia r1!, {r3, r4, r5, r6, r7, r8, ip, lr}
101 stmia r0!, {r3, r4, r5, r6, r7, r8, ip, lr}
108 addne pc, pc, ip @ C is always clear here
132 7: ldmfd sp!, {r5 - r8}
133 cfi_adjust_cfa_offset (-16)
139 8: movs r2, r2, lsl #31
147 #if defined (__ARM_ARCH_4T__) && defined(__THUMB_INTERWORK__)
148 ldmfd sp!, {r0, r4, lr}
149 cfi_adjust_cfa_offset (-12)
154 ldmfd sp!, {r0, r4, pc}
179 .macro forward_copy_shift pull push
184 CALGN( ands ip, r1, #31 )
185 CALGN( rsb ip, ip, #32 )
186 CALGN( sbcnes r4, ip, r2 ) @ C is always set here
187 CALGN( subcc r2, r2, ip )
190 11: stmfd sp!, {r5 - r9}
191 cfi_adjust_cfa_offset (20)
192 cfi_rel_offset (r5, 0)
193 cfi_rel_offset (r6, 4)
194 cfi_rel_offset (r7, 8)
195 cfi_rel_offset (r8, 12)
196 cfi_rel_offset (r9, 16)
199 PLD( subs r2, r2, #96 )
205 12: PLD( pld [r1, #124] )
206 13: ldmia r1!, {r4, r5, r6, r7}
207 mov r3, lr, pull #\pull
209 ldmia r1!, {r8, r9, ip, lr}
210 orr r3, r3, r4, push #\push
211 mov r4, r4, pull #\pull
212 orr r4, r4, r5, push #\push
213 mov r5, r5, pull #\pull
214 orr r5, r5, r6, push #\push
215 mov r6, r6, pull #\pull
216 orr r6, r6, r7, push #\push
217 mov r7, r7, pull #\pull
218 orr r7, r7, r8, push #\push
219 mov r8, r8, pull #\pull
220 orr r8, r8, r9, push #\push
221 mov r9, r9, pull #\pull
222 orr r9, r9, ip, push #\push
223 mov ip, ip, pull #\pull
224 orr ip, ip, lr, push #\push
225 stmia r0!, {r3, r4, r5, r6, r7, r8, r9, ip}
231 cfi_adjust_cfa_offset (-20)
241 15: mov r3, lr, pull #\pull
244 orr r3, r3, lr, push #\push
250 16: sub r1, r1, #(\push / 8)
256 forward_copy_shift pull=8 push=24
258 17: forward_copy_shift pull=16 push=16
260 18: forward_copy_shift pull=24 push=8
263 libc_hidden_builtin_def (memcpy)