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, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 * Data preload for architectures that support it (ARM V5TE and above)
26 #if (!defined (__ARM_ARCH_2__) && !defined (__ARM_ARCH_3__) \
27 && !defined (__ARM_ARCH_3M__) && !defined (__ARM_ARCH_4__) \
28 && !defined (__ARM_ARCH_4T__) && !defined (__ARM_ARCH_5__) \
29 && !defined (__ARM_ARCH_5T__))
30 #define PLD(code...) code
36 * This can be used to enable code to cacheline align the source pointer.
37 * Experiments on tested architectures (StrongARM and XScale) didn't show
38 * this a worthwhile thing to do. That might be different in the future.
40 //#define CALGN(code...) code
41 #define CALGN(code...)
44 * Endian independent macros for shifting bytes within registers.
56 /* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
60 stmfd sp!, {r0, r4, lr}
61 cfi_adjust_cfa_offset (12)
62 cfi_rel_offset (r4, 4)
63 cfi_rel_offset (lr, 8)
77 cfi_adjust_cfa_offset (16)
78 cfi_rel_offset (r5, 0)
79 cfi_rel_offset (r6, 4)
80 cfi_rel_offset (r7, 8)
81 cfi_rel_offset (r8, 12)
84 CALGN( ands ip, r1, #31 )
85 CALGN( rsb r3, ip, #32 )
86 CALGN( sbcnes r4, r3, r2 ) @ C is always set here
89 CALGN( subs r2, r2, r3 ) @ C gets set
90 CALGN( add pc, r4, ip )
93 2: PLD( subs r2, r2, #96 )
99 3: PLD( pld [r1, #124] )
100 4: ldmia r1!, {r3, r4, r5, r6, r7, r8, ip, lr}
102 stmia r0!, {r3, r4, r5, r6, r7, r8, ip, lr}
109 addne pc, pc, ip @ C is always clear here
133 7: ldmfd sp!, {r5 - r8}
134 cfi_adjust_cfa_offset (-16)
140 8: movs r2, r2, lsl #31
148 #if defined (__ARM_ARCH_4T__) && defined(__THUMB_INTERWORK__)
149 ldmfd sp!, {r0, r4, lr}
150 cfi_adjust_cfa_offset (-12)
155 ldmfd sp!, {r0, r4, pc}
180 .macro forward_copy_shift pull push
185 CALGN( ands ip, r1, #31 )
186 CALGN( rsb ip, ip, #32 )
187 CALGN( sbcnes r4, ip, r2 ) @ C is always set here
188 CALGN( subcc r2, r2, ip )
191 11: stmfd sp!, {r5 - r9}
192 cfi_adjust_cfa_offset (20)
193 cfi_rel_offset (r5, 0)
194 cfi_rel_offset (r6, 4)
195 cfi_rel_offset (r7, 8)
196 cfi_rel_offset (r8, 12)
197 cfi_rel_offset (r9, 16)
200 PLD( subs r2, r2, #96 )
206 12: PLD( pld [r1, #124] )
207 13: ldmia r1!, {r4, r5, r6, r7}
208 mov r3, lr, pull #\pull
210 ldmia r1!, {r8, r9, ip, lr}
211 orr r3, r3, r4, push #\push
212 mov r4, r4, pull #\pull
213 orr r4, r4, r5, push #\push
214 mov r5, r5, pull #\pull
215 orr r5, r5, r6, push #\push
216 mov r6, r6, pull #\pull
217 orr r6, r6, r7, push #\push
218 mov r7, r7, pull #\pull
219 orr r7, r7, r8, push #\push
220 mov r8, r8, pull #\pull
221 orr r8, r8, r9, push #\push
222 mov r9, r9, pull #\pull
223 orr r9, r9, ip, push #\push
224 mov ip, ip, pull #\pull
225 orr ip, ip, lr, push #\push
226 stmia r0!, {r3, r4, r5, r6, r7, r8, r9, ip}
232 cfi_adjust_cfa_offset (-20)
242 15: mov r3, lr, pull #\pull
245 orr r3, r3, lr, push #\push
251 16: sub r1, r1, #(\push / 8)
257 forward_copy_shift pull=8 push=24
259 17: forward_copy_shift pull=16 push=16
261 18: forward_copy_shift pull=24 push=8
264 libc_hidden_builtin_def (memcpy)