| author | mikek |
| Fri, 02 Jul 2010 14:28:50 +0100 | |
| branch | GCC_SURGE |
| changeset 192 | 8132de65a0da |
| parent 188 | 38a7352e23d3 |
| child 203 | 71dce6d9df02 |
| permissions | -rw-r--r-- |
| 0 | 1 |
// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// e32\common\arm\cmem.cia |
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// |
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// |
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#include "../common.h" |
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#include <e32cia.h> |
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#if defined(__REPLACE_GENERIC_UTILS) |
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#include "replacement_utils.h" |
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#endif |
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#if defined(__MEM_MACHINE_CODED__) |
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#ifndef USE_REPLACEMENT_MEMSET |
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#if defined(_DEBUG) |
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#ifdef __STANDALONE_NANOKERNEL__ |
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#define ARM_ASSERT_MULTIPLE_OF_FOUR(rt1, panicfunc) \ |
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asm("tst "#rt1", #3"); \
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asm("ldrne "#rt1", ["#rt1"]")
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#else // __STANDALONE_NANOKERNEL__ |
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GLDEF_C void PanicEWordMoveLengthNotMultipleOf4(); |
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GLDEF_C void PanicEWordMoveSourceNotAligned(); |
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GLDEF_C void PanicEWordMoveTargetNotAligned(); |
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#define ARM_ASSERT_MULTIPLE_OF_FOUR(rt1, panicfunc) \ |
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asm("tst "#rt1", #3"); \
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asm("bne " panicfunc )
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#endif // __STANDALONE_NANOKERNEL__ |
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#else // _DEBUG |
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#define ARM_ASSERT_MULTIPLE_OF_FOUR(rt1, panicfunc) |
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#endif //_DEBUG |
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// See header file e32cmn.h for the in-source documentation. |
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extern "C" EXPORT_C __NAKED__ TAny* memclr(TAny* /*aTrg*/, unsigned int /*aLength*/) |
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{
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KMEMCLRHOOK |
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asm("mov r2, #0 ");
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asm("b fill ");
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} |
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// See header file e32cmn.h for the in-source documentation. |
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extern "C" EXPORT_C __NAKED__ TAny* memset(TAny* /*aTrg*/, TInt /*aValue*/, unsigned int /*aLength*/) |
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{
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KMEMSETHOOK |
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asm(" mov r3, r2 "); /* length into r3 */
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asm(" and r2,r1,#255"); /* fill value into r2 */
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asm(" mov r1, r3 "); /* length into r1 */
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asm("fill:");
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asm(" cmp r1,#8");
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asm(" bls small_fill"); // only taken ~20% of the time
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asm(" stmfd sp!,{r0,r4-r9,lr}");
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asm(" movs r3, r0, lsl #30 "); // Check if word aligned
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asm(" orr r2,r2,r2,lsl #8");
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asm(" orr r2,r2,r2,lsl #16");
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asm(" bne unaligned_fill ");
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// Align destination address to 32 byte boundary if possible |
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asm("word_aligned_fill: ");
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asm(" mov r4,r2");
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asm(" mov r5,r2");
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asm(" mov r6,r2");
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asm(" movs r3, r0, lsl #27 ");
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asm(" beq aligned_fill ");
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asm(" rsb r3, r3, #0 "); // calculate fill length necessary for aligment
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asm(" cmp r1, r3, lsr #27 "); // compare with remaining length
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asm(" blo smaller_fill "); // skip alignment if greater
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asm(" msr cpsr_f, r3 "); // put length bits 4, 3, 2 into N, Z, C flags
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asm(" strcs r2, [r0], #4 "); // align to 8 byte boundary
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asm(" stmeqia r0!, {r2, r4} "); // align to 16 byte boundary
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asm(" stmmiia r0!, {r2, r4-r6} "); // align to 32 byte boundary
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asm(" sub r1, r1, r3, lsr #27 "); // adjust remaining length
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asm("aligned_fill:");
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asm(" cmp r1, #64 ");
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asm(" bhs big_fill ");
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// Fill 0-63 bytes |
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asm("smaller_fill:");
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asm(" movs r1, r1, lsl #26");
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asm(" beq mem_fill_end ");
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asm(" msr cpsr_flg, r1 ");
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asm(" stmmiia r0!,{r2,r4-r6}"); // Fill 32
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asm(" stmmiia r0!,{r2,r4-r6}");
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asm(" stmeqia r0!,{r2,r4-r6}"); // Fill 16
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asm(" stmcsia r0!,{r2,r4}"); // Fill 8
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asm(" strvs r2,[r0],#4"); // Fill 4
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asm(" movs r1, r1, lsl #4 ");
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asm(" bne smallest_fill ");
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asm("mem_fill_end: ");
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__POPRET("r0,r4-r9,");
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// Fill last 1-3 bytes |
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asm("smallest_fill: ");
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asm(" msr cpsr_flg,r1");
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asm(" strmih r2,[r0],#2"); // Fill 2
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asm(" streqb r2,[r0],#1"); // Fill 1
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__POPRET("r0,r4-r9,");
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// Fill loop for length >= 64 |
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asm("big_fill: ");
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asm(" mov r3,r2");
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asm(" mov r7,r2");
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asm(" mov r8,r2");
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asm(" mov r9,r2");
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asm(" movs ip,r1,lsr #8"); // Number of 256 byte blocks to fill
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asm(" beq medium_fill ");
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asm("fill_256_bytes_loop:");
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asm(" stmia r0!,{r2-r9}"); // Fill 256 bytes
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asm(" stmia r0!,{r2-r9}");
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asm(" stmia r0!,{r2-r9}");
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asm(" stmia r0!,{r2-r9}");
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asm(" stmia r0!,{r2-r9}");
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asm(" stmia r0!,{r2-r9}");
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asm(" stmia r0!,{r2-r9}");
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asm(" stmia r0!,{r2-r9}");
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asm(" subs ip,ip,#1");
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asm(" bne fill_256_bytes_loop");
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asm("medium_fill: ");
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asm(" movs ip,r1,lsl #24");
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asm(" msr cpsr_flg,ip");
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asm(" stmmiia r0!,{r2-r9}"); // Fill 128
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asm(" stmmiia r0!,{r2-r9}");
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asm(" stmmiia r0!,{r2-r9}");
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asm(" stmmiia r0!,{r2-r9}");
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asm(" stmeqia r0!,{r2-r9}"); // Fill 64
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asm(" stmeqia r0!,{r2-r9}");
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asm(" and r1, r1, #63 ");
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asm(" b smaller_fill");
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// Word-align destination address, length >= 8 |
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asm("unaligned_fill: ");
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asm(" rsb r3, r3, #0 "); // calculate fill length necessary for aligment
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asm(" msr cpsr_flg, r3");
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asm(" streqb r2, [r0], #1 "); // align to 2 byte boundary
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asm(" strmih r2, [r0], #2 "); // align to 4 byte boundary
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asm(" sub r1, r1, r3, lsr #30 ");
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asm(" b word_aligned_fill ");
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// Fill for length <= 8 |
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asm("small_fill: ");
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asm(" mov r3, r0 "); /* r3=dest */
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asm(" adr ip, small_fill_end ");
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asm(" sub pc, ip, r1, lsl #2 ");
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asm(" strb r2, [r3], #1");
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asm(" strb r2, [r3], #1");
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asm(" strb r2, [r3], #1");
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asm(" strb r2, [r3], #1");
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asm(" strb r2, [r3], #1");
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asm(" strb r2, [r3], #1");
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asm(" strb r2, [r3], #1");
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asm(" strb r2, [r3], #1");
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asm("small_fill_end: ");
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__JUMP(,lr); |
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188
38a7352e23d3
1) Fix for Bug 3117 - [GCCE] Missing symbols in linkage of template_ekern.exe
mikek
parents:
0
diff
changeset
|
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} |
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38a7352e23d3
1) Fix for Bug 3117 - [GCCE] Missing symbols in linkage of template_ekern.exe
mikek
parents:
0
diff
changeset
|
185 |
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| 0 | 186 |
#endif // USE_REPLACEMENT_MEMSET |
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#ifndef USE_REPLACEMENT_MEMCPY |
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// See header file e32cmn.h for the in-source documentation. |
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extern "C" EXPORT_C __NAKED__ TAny* wordmove(TAny* /*aTrg*/, const TAny* /*aSrc*/, unsigned int /*aLength*/) |
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// |
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// Assumes all is aligned |
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// |
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{
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ARM_ASSERT_MULTIPLE_OF_FOUR(r0, CSM_Z30PanicEWordMoveTargetNotAlignedv); |
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ARM_ASSERT_MULTIPLE_OF_FOUR(r1, CSM_Z30PanicEWordMoveSourceNotAlignedv); |
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ARM_ASSERT_MULTIPLE_OF_FOUR(r2, CSM_Z34PanicEWordMoveLengthNotMultipleOf4v); |
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// Mask length to a multiple of four bytes to avoid memory, or register |
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// corruption by the special cases below. |
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asm("bic r2,r2,#3");
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// Length <= 24 in ~90% of cases, however can only copy > 16 bytes in 4 |
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// instructions if LDM instuction restores thumb state when loading the PC. |
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#ifdef __CPU_ARM_LDR_PC_SETS_TBIT |
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asm("cmp r2, #24 ");
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#else |
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asm("cmp r2, #16 ");
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#endif |
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PLD(1); |
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asm("addls pc, pc, r2, lsl #2 "); // take branch depending on size
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asm("b 9f "); // too big
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// 0 words |
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__JUMP(,lr); |
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__JUMP(,lr); |
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__JUMP(,lr); |
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__JUMP(,lr); |
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// 1 word |
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asm("ldr ip, [r1] ");
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asm("str ip, [r0] ");
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__JUMP(,lr); |
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__JUMP(,lr); |
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// 2 words |
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asm("ldmia r1, {r2,r3}");
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asm("stmia r0, {r2,r3}");
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__JUMP(,lr); |
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__JUMP(,lr); |
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// 3 words |
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asm("ldmia r1, {r2,r3,ip}");
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asm("stmia r0, {r2,r3,ip}");
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__JUMP(,lr); |
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__JUMP(,lr); |
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// 4 words |
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asm("ldmia r1, {r1,r2,r3,ip}");
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asm("stmia r0, {r1,r2,r3,ip}");
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__JUMP(,lr); |
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__JUMP(,lr); |
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#ifdef __CPU_ARM_LDR_PC_SETS_TBIT |
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// 5 words |
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asm("stmfd sp!, {lr}");
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asm("ldmia r1, {r1,r2,r3,ip,lr}");
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asm("stmia r0, {r1,r2,r3,ip,lr}");
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asm("ldmfd sp!, {pc}");
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// 6 words |
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asm("stmfd sp!, {r4,lr}");
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asm("ldmia r1, {r1,r2,r3,r4,ip,lr}");
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asm("stmia r0, {r1,r2,r3,r4,ip,lr}");
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asm("ldmfd sp!, {r4,pc}");
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#endif |
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asm("9: ");
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asm("subs r3, r0, r1 "); // r3 = dest - source
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__JUMP(eq,lr); // return if source = dest |
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asm("stmfd sp!, {r0,r4-r11,lr} ");
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asm("cmphi r2, r3 "); // if dest>source, compare length with dest-source
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asm("bls mem_move_fore "); // if dest<source or length<=dest-source do forwards aligned copy
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asm("add r0, r0, r2 ");
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asm("add r1, r1, r2 ");
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asm("b mem_move_back "); // Backwards aligned copy
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} |
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// See header file e32cmn.h for the in-source documentation. |
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extern "C" EXPORT_C __NAKED__ TAny* memmove(TAny* /*aTrg*/, const TAny* /*aSrc*/, unsigned int /*aLength*/) |
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{
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KMEMMOVEHOOK |
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// fall through |
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} |
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// See header file e32cmn.h for the in-source documentation. |
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extern "C" EXPORT_C __NAKED__ TAny* memcpy(TAny* /*aTrg*/, const TAny* /*aSrc*/, unsigned int /*aLength*/) |
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{
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KMEMCPYHOOK |
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// |
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// Check for zero length or source and target being the same |
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// |
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asm(" cmp r2, #0 "); // zero length?
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asm(" subnes r3, r0, r1 "); // if not, r3 = dest-source
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__JUMP(eq,lr); // if zero length or dest=source, nothing to do |
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asm(" cmphi r2, r3 "); // if dest>source compare length to dest-source
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asm(" movhi r3, #0 "); // if dest>source and length>dest-source need to go backwards - set r3=0
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// |
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// If <16 bytes, just do byte moves |
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// |
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asm(" cmp r2, #15 ");
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asm(" bhi main_copy ");
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asm(" ldrb r12, [r0] "); // read dest so it's in cache - avoid lots of single accesses to external memory
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asm(" sub r12, r0, #1 ");
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asm(" ldrb r12, [r12, r2] "); // read dest+length-1
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asm(" cmp r3, #0 ");
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asm(" beq small_copy_back "); // r3=0 means go backwards
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asm("small_copy_fwd: ");
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asm(" mov r3, r0 ");
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asm(" adr r12, small_copy_fwd_end ");
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asm(" sub pc, r12, r2, lsl #3 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm(" ldrb r12, [r1], #1 ");
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asm(" strb r12, [r3], #1 ");
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asm("small_copy_fwd_end: ");
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__JUMP(,lr); |
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asm("small_copy_back: ");
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asm(" add r3, r0, r2 ");
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asm(" add r1, r1, r2 ");
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asm(" adr r12, small_copy_back_end ");
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asm(" sub pc, r12, r2, lsl #3 ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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asm(" ldrb r12, [r1, #-1]! ");
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asm(" strb r12, [r3, #-1]! ");
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|
367 |
asm(" ldrb r12, [r1, #-1]! ");
|
|
368 |
asm(" strb r12, [r3, #-1]! ");
|
|
369 |
asm(" ldrb r12, [r1, #-1]! ");
|
|
370 |
asm(" strb r12, [r3, #-1]! ");
|
|
371 |
asm(" ldrb r12, [r1, #-1]! ");
|
|
372 |
asm(" strb r12, [r3, #-1]! ");
|
|
373 |
asm(" ldrb r12, [r1, #-1]! ");
|
|
374 |
asm(" strb r12, [r3, #-1]! ");
|
|
375 |
asm(" ldrb r12, [r1, #-1]! ");
|
|
376 |
asm(" strb r12, [r3, #-1]! ");
|
|
377 |
asm(" ldrb r12, [r1, #-1]! ");
|
|
378 |
asm(" strb r12, [r3, #-1]! ");
|
|
379 |
asm(" ldrb r12, [r1, #-1]! ");
|
|
380 |
asm(" strb r12, [r3, #-1]! ");
|
|
381 |
asm("small_copy_back_end: ");
|
|
382 |
__JUMP(,lr); |
|
383 |
||
384 |
||
385 |
asm("main_copy: ");
|
|
386 |
PLD(1); // preload first two cache lines |
|
387 |
PLD_ioff(1, 32); |
|
388 |
asm(" stmfd sp!, {r0,r4-r11,lr} "); // r0 == dest, r1 == src, r2 == len
|
|
389 |
asm(" cmp r3, #0 ");
|
|
390 |
asm(" beq copy_back "); // we must go backwards
|
|
391 |
asm(" movs r3, r0, lsl #30 "); // check destination word aligned
|
|
392 |
asm(" bne dest_unaligned_fore ");
|
|
393 |
||
394 |
// |
|
395 |
// Normal copy forwards. r0 should point to end address on exit |
|
396 |
// Destination now word-aligned; if source is also word-aligned, do aligned copy. |
|
397 |
// |
|
398 |
asm("dest_aligned_fore: ");
|
|
399 |
asm(" ands r12, r1, #3 "); // r12=alignment of source
|
|
400 |
asm(" bne copy_fwd_nonaligned ");
|
|
401 |
||
402 |
// |
|
403 |
// We are now word aligned, at least 13 bytes to do |
|
404 |
// |
|
405 |
||
406 |
asm("mem_move_fore:");
|
|
407 |
// |
|
408 |
// superalign |
|
409 |
// |
|
410 |
asm(" movs r4, r0, lsl #27 "); // destination alignment into r4
|
|
411 |
asm(" beq f_al_already_aligned "); // fast path
|
|
412 |
asm(" rsb r4, r4, #0 "); // bytes required to align destination to 32
|
|
413 |
asm(" cmp r2, r4, lsr #27 "); // check that many remaining
|
|
414 |
asm(" blo its_smaller_fore "); // if too short, just stick with word alignment
|
|
415 |
asm(" msr cpsr_flg, r4 "); // destination alignment into N, Z, C flags
|
|
416 |
// do word moves to align destination |
|
417 |
asm(" ldrcs lr, [r1], #4 "); // C flag == 1 word (we are already word aligned)
|
|
418 |
asm(" ldmeqia r1!, {r3,r9} "); // Z flag == 2 words
|
|
419 |
asm(" ldmmiia r1!, {r5-r8} "); // N flag == 4 words, destination now 32 byte aligned
|
|
420 |
asm(" sub r2, r2, r4, lsr #27 "); // adjust length
|
|
421 |
asm(" strcs lr, [r0], #4 "); // destination now 8 byte aligned
|
|
422 |
asm(" stmeqia r0!, {r3,r9} "); // destination now 16 byte aligned
|
|
423 |
asm(" stmmiia r0!, {r5-r8} "); // destination now 32 byte aligned
|
|
424 |
||
425 |
asm("f_al_already_aligned: ");
|
|
426 |
asm(" cmp r2, #64 ");
|
|
427 |
asm(" bhs large_copy_fore ");
|
|
428 |
// |
|
429 |
// Less than 64 bytes to go... |
|
430 |
// |
|
431 |
asm("its_smaller_fore:");
|
|
432 |
asm(" movs ip, r2, lsl #26 "); // length bits 5, 4, 3, 2 into N, Z, C, V
|
|
433 |
asm(" beq mem_copy_end "); // skip if remaining length zero
|
|
434 |
asm(" msr cpsr_flg, ip ");
|
|
435 |
asm(" ldmmiia r1!, {r3-r10} ");
|
|
436 |
asm(" stmmiia r0!, {r3-r10} "); // copy 32
|
|
437 |
asm(" ldmeqia r1!, {r3-r6} ");
|
|
438 |
asm(" ldmcsia r1!, {r7-r8} ");
|
|
439 |
asm(" ldrvs r9, [r1], #4 ");
|
|
440 |
asm(" stmeqia r0!, {r3-r6} "); // copy 16
|
|
441 |
asm(" stmcsia r0!, {r7-r8} "); // copy 8
|
|
442 |
asm(" strvs r9, [r0], #4 "); // copy 4
|
|
443 |
||
444 |
asm(" movs ip, r2, lsl #30 ");
|
|
445 |
asm(" bne smallest_copy_fore ");
|
|
446 |
||
447 |
asm("mem_copy_end: ");
|
|
448 |
__POPRET("r0,r4-r11,");
|
|
449 |
||
450 |
||
451 |
// |
|
452 |
// Less than 4 bytes to go... |
|
453 |
// |
|
454 |
||
455 |
asm("smallest_copy_fore: ");
|
|
456 |
asm(" msr cpsr_flg, ip ");
|
|
457 |
asm(" ldrmih r3, [r1], #2 ");
|
|
458 |
asm(" ldreqb r4, [r1], #1 ");
|
|
459 |
asm(" strmih r3, [r0], #2 "); // copy 2
|
|
460 |
asm(" streqb r4, [r0], #1 "); // copy 1
|
|
461 |
__POPRET("r0,r4-r11,");
|
|
462 |
||
463 |
||
464 |
// |
|
465 |
// Do byte moves if necessary to word-align destination |
|
466 |
// |
|
467 |
asm("dest_unaligned_fore: ");
|
|
468 |
asm(" rsb r3, r3, #0 ");
|
|
469 |
asm(" msr cpsr_flg, r3 ");
|
|
470 |
asm(" ldrmib r4, [r1], #1 "); // move bytes to align destination
|
|
471 |
asm(" ldrmib r5, [r1], #1 ");
|
|
472 |
asm(" ldreqb r6, [r1], #1 ");
|
|
473 |
asm(" sub r2, r2, r3, lsr #30 "); // adjust length, at least 13 bytes remaining
|
|
474 |
asm(" strmib r4, [r0], #1 ");
|
|
475 |
asm(" strmib r5, [r0], #1 ");
|
|
476 |
asm(" streqb r6, [r0], #1 ");
|
|
477 |
asm(" b dest_aligned_fore ");
|
|
478 |
||
479 |
||
480 |
// |
|
481 |
// Large copy, length >= 64 |
|
482 |
// |
|
483 |
||
484 |
asm("large_copy_fore: ");
|
|
485 |
asm(" movs ip, r2, lsr #6 "); // ip = number of 64 blocks to copy
|
|
486 |
asm("1: ");
|
|
487 |
PLD_ioff(1, 32); |
|
488 |
PLD_ioff(1, 64); |
|
489 |
asm(" ldmia r1!, {r3-r10} "); // Copy 64
|
|
490 |
asm(" stmia r0!, {r3-r10} ");
|
|
491 |
asm(" ldmia r1!, {r3-r10} ");
|
|
492 |
asm(" subs ip, ip, #1 ");
|
|
493 |
asm(" stmia r0!, {r3-r10} ");
|
|
494 |
asm(" bne 1b ");
|
|
495 |
asm(" and r2, r2, #63 ");
|
|
496 |
asm(" b its_smaller_fore ");
|
|
497 |
||
498 |
||
499 |
// |
|
500 |
// Forward unlaigned copy |
|
501 |
// |
|
502 |
||
503 |
asm("copy_fwd_nonaligned:");
|
|
504 |
// |
|
505 |
// superalign |
|
506 |
// |
|
507 |
asm(" bic r1, r1, #3 "); // align source
|
|
508 |
asm(" ldr r11, [r1], #4 "); // get first word
|
|
509 |
asm(" mov r12, r12, lsl #3 "); // r12 = 8*source alignment
|
|
510 |
asm(" ands r4, r0, #31 "); // destination alignment into r4
|
|
511 |
asm(" beq medium_unal_copy "); // skip if already aligned
|
|
512 |
asm(" rsb r4, r4, #32 "); // r4 = bytes to align dest to 32
|
|
513 |
asm(" cmp r2, r4 "); // check if length big enough to align to 32
|
|
514 |
asm(" blo copy_fwd_remainder "); // skip if too small
|
|
515 |
asm(" sub r2, r2, r4 "); // adjust length
|
|
516 |
asm(" rsb r3, r12, #32 "); // r3 = 32 - 8*source alignment
|
|
517 |
||
518 |
asm("1: ");
|
|
519 |
asm(" mov r5, r11, lsr r12 "); // r5 = part of previous source word required to make destination word
|
|
520 |
asm(" ldr r11, [r1], #4 "); // get next word
|
|
521 |
asm(" subs r4, r4, #4 "); // 4 bytes less to do
|
|
522 |
asm(" orr r5, r5, r11, lsl r3 "); // form next destination word
|
|
523 |
asm(" str r5, [r0], #4 "); // and store it
|
|
524 |
asm(" bne 1b "); // loop until destination 32 byte aligned
|
|
525 |
||
526 |
asm("medium_unal_copy: "); // destination now aligned to 32 bytes
|
|
527 |
asm(" movs lr, r2, lsr #5 "); // lr=number of 32-byte blocks
|
|
528 |
asm(" beq copy_fwd_remainder "); // skip if length < 32
|
|
529 |
||
530 |
asm(" cmp r12, #16 ");
|
|
531 |
asm(" beq copy_fwd_nonaligned_2 "); // branch if source = 2 mod 4
|
|
532 |
asm(" bhi copy_fwd_nonaligned_3 "); // branch if source = 3 mod 4, else source = 1 mod 4
|
|
533 |
||
534 |
// source = 1 mod 4 |
|
535 |
asm("copy_fwd_nonaligned_1: ");
|
|
536 |
asm(" mov r3, r11, lsr #8 ");
|
|
537 |
asm(" ldmia r1!, {r4-r11} ");
|
|
538 |
PLD_ioff(1, 32); |
|
539 |
asm(" subs lr, lr, #1 ");
|
|
540 |
asm(" orr r3, r3, r4, lsl #24 ");
|
|
541 |
asm(" mov r4, r4, lsr #8 ");
|
|
542 |
asm(" orr r4, r4, r5, lsl #24 ");
|
|
543 |
asm(" mov r5, r5, lsr #8 ");
|
|
544 |
asm(" orr r5, r5, r6, lsl #24 ");
|
|
545 |
asm(" mov r6, r6, lsr #8 ");
|
|
546 |
asm(" orr r6, r6, r7, lsl #24 ");
|
|
547 |
asm(" mov r7, r7, lsr #8 ");
|
|
548 |
asm(" orr r7, r7, r8, lsl #24 ");
|
|
549 |
asm(" mov r8, r8, lsr #8 ");
|
|
550 |
asm(" orr r8, r8, r9, lsl #24 ");
|
|
551 |
asm(" mov r9, r9, lsr #8 ");
|
|
552 |
asm(" orr r9, r9, r10, lsl #24 ");
|
|
553 |
asm(" mov r10, r10, lsr #8 ");
|
|
554 |
asm(" orr r10, r10, r11, lsl #24 ");
|
|
555 |
asm(" stmia r0!, {r3-r10} ");
|
|
556 |
asm(" bne copy_fwd_nonaligned_1 ");
|
|
557 |
asm(" b copy_fwd_remainder ");
|
|
558 |
||
559 |
// source = 2 mod 4 |
|
560 |
asm("copy_fwd_nonaligned_2: ");
|
|
561 |
asm(" mov r3, r11, lsr #16 ");
|
|
562 |
asm(" ldmia r1!, {r4-r11} ");
|
|
563 |
PLD_ioff(1, 32); |
|
564 |
asm(" subs lr, lr, #1 ");
|
|
565 |
asm(" orr r3, r3, r4, lsl #16 ");
|
|
566 |
asm(" mov r4, r4, lsr #16 ");
|
|
567 |
asm(" orr r4, r4, r5, lsl #16 ");
|
|
568 |
asm(" mov r5, r5, lsr #16 ");
|
|
569 |
asm(" orr r5, r5, r6, lsl #16 ");
|
|
570 |
asm(" mov r6, r6, lsr #16 ");
|
|
571 |
asm(" orr r6, r6, r7, lsl #16 ");
|
|
572 |
asm(" mov r7, r7, lsr #16 ");
|
|
573 |
asm(" orr r7, r7, r8, lsl #16 ");
|
|
574 |
asm(" mov r8, r8, lsr #16 ");
|
|
575 |
asm(" orr r8, r8, r9, lsl #16 ");
|
|
576 |
asm(" mov r9, r9, lsr #16 ");
|
|
577 |
asm(" orr r9, r9, r10, lsl #16 ");
|
|
578 |
asm(" mov r10, r10, lsr #16 ");
|
|
579 |
asm(" orr r10, r10, r11, lsl #16 ");
|
|
580 |
asm(" stmia r0!, {r3-r10} ");
|
|
581 |
asm(" bne copy_fwd_nonaligned_2 ");
|
|
582 |
asm(" b copy_fwd_remainder ");
|
|
583 |
||
584 |
// source = 3 mod 4 |
|
585 |
asm("copy_fwd_nonaligned_3: ");
|
|
586 |
asm(" mov r3, r11, lsr #24 ");
|
|
587 |
asm(" ldmia r1!, {r4-r11} ");
|
|
588 |
PLD_ioff(1, 32); |
|
589 |
asm(" subs lr, lr, #1 ");
|
|
590 |
asm(" orr r3, r3, r4, lsl #8 ");
|
|
591 |
asm(" mov r4, r4, lsr #24 ");
|
|
592 |
asm(" orr r4, r4, r5, lsl #8 ");
|
|
593 |
asm(" mov r5, r5, lsr #24 ");
|
|
594 |
asm(" orr r5, r5, r6, lsl #8 ");
|
|
595 |
asm(" mov r6, r6, lsr #24 ");
|
|
596 |
asm(" orr r6, r6, r7, lsl #8 ");
|
|
597 |
asm(" mov r7, r7, lsr #24 ");
|
|
598 |
asm(" orr r7, r7, r8, lsl #8 ");
|
|
599 |
asm(" mov r8, r8, lsr #24 ");
|
|
600 |
asm(" orr r8, r8, r9, lsl #8 ");
|
|
601 |
asm(" mov r9, r9, lsr #24 ");
|
|
602 |
asm(" orr r9, r9, r10, lsl #8 ");
|
|
603 |
asm(" mov r10, r10, lsr #24 ");
|
|
604 |
asm(" orr r10, r10, r11, lsl #8 ");
|
|
605 |
asm(" stmia r0!, {r3-r10} ");
|
|
606 |
asm(" bne copy_fwd_nonaligned_3 ");
|
|
607 |
||
608 |
// <32 bytes to go, source alignment could be 1, 2 or 3 mod 4 |
|
609 |
// r12 = 8 * (source mod 4) |
|
610 |
asm("copy_fwd_remainder: ");
|
|
611 |
asm(" ands r4, r2, #0x1c "); // r4 = 4*number of words left
|
|
612 |
asm(" beq 2f "); // skip if none
|
|
613 |
asm(" rsb r3, r12, #32 "); // r3 = 32 - 8*source alignment
|
|
614 |
||
615 |
asm("1: ");
|
|
616 |
asm(" mov r5, r11, lsr r12 "); // r5 = part of previous source word required to make destination word
|
|
617 |
asm(" ldr r11, [r1], #4 "); // get next word
|
|
618 |
asm(" subs r4, r4, #4 "); // 4 bytes less to do
|
|
619 |
asm(" orr r5, r5, r11, lsl r3 "); // form next destination word
|
|
620 |
asm(" str r5, [r0], #4 "); // and store it
|
|
621 |
asm(" bne 1b "); // loop until destination 32 byte aligned
|
|
622 |
||
623 |
asm("2: ");
|
|
624 |
asm(" sub r1, r1, #4 ");
|
|
625 |
asm(" add r1, r1, r12, lsr #3 "); // r1 = real unaligned source address
|
|
626 |
asm(" tst r2, #2 "); // 2 bytes left?
|
|
627 |
asm(" ldrneb r5, [r1], #1 "); // copy 2
|
|
628 |
asm(" strneb r5, [r0], #1 ");
|
|
629 |
asm(" ldrneb r5, [r1], #1 ");
|
|
630 |
asm(" strneb r5, [r0], #1 ");
|
|
631 |
asm(" tst r2, #1 "); // 1 byte left?
|
|
632 |
asm(" ldrneb r5, [r1], #1 "); // copy 1
|
|
633 |
asm(" strneb r5, [r0], #1 ");
|
|
634 |
__POPRET("r0,r4-r11,");
|
|
635 |
||
636 |
||
637 |
// |
|
638 |
// Source is before destination and they overlap, so need to copy backwards |
|
639 |
// |
|
640 |
||
641 |
asm("copy_back:");
|
|
642 |
asm(" add r0, r0, r2 "); // r0=last dest address+1
|
|
643 |
asm(" add r1, r1, r2 "); // r1=last source address+1
|
|
644 |
PLD_noff(1, 33); // preload last two cache lines |
|
645 |
PLD_noff(1, 1); |
|
646 |
||
647 |
asm(" movs r3, r0, lsl #30 "); // check destination word aligned
|
|
648 |
asm(" bne dest_unaligned_back ");
|
|
649 |
||
650 |
asm("dest_aligned_back: ");
|
|
651 |
asm(" ands r12, r1, #3 "); // r12=alignment of source
|
|
652 |
asm(" bne copy_back_nonaligned ");
|
|
653 |
||
654 |
// |
|
655 |
// Backwards copying, addresses both word aligned, at least 13 bytes to go |
|
656 |
// |
|
657 |
||
658 |
asm("mem_move_back:");
|
|
659 |
// |
|
660 |
// superalign |
|
661 |
// |
|
662 |
asm(" movs r4, r0, lsl #27 "); // bytes required to align destination to 32
|
|
663 |
asm(" beq bal_already_aligned "); // skip if already aligned to 32
|
|
664 |
asm(" cmp r2, r4, lsr #27 "); // check that many remaining
|
|
665 |
asm(" blo its_smaller_back "); // if too short, just stick with word alignment
|
|
666 |
asm(" msr cpsr_flg, r4 "); // destination alignment into N, Z, C flags
|
|
667 |
// do word moves to align destination |
|
668 |
asm(" ldrcs lr, [r1, #-4]! "); // C flag == 1 word (we are already word aligned)
|
|
669 |
asm(" ldmeqdb r1!, {r3,r9} "); // Z flag == 2 words
|
|
670 |
asm(" ldmmidb r1!, {r5-r8} ");
|
|
671 |
asm(" sub r2, r2, r4, lsr #27 "); // adjust length
|
|
672 |
asm(" strcs lr, [r0, #-4]! "); // destination now 8 byte aligned
|
|
673 |
asm(" stmeqdb r0!, {r3,r9} "); // destination now 16 byte aligned
|
|
674 |
asm(" stmmidb r0!, {r5-r8} "); // N flag == 4 words, destination now 32 byte aligned
|
|
675 |
||
676 |
asm("bal_already_aligned: ");
|
|
677 |
asm(" cmp r2, #64 ");
|
|
678 |
asm(" bhs large_copy_back ");
|
|
679 |
// |
|
680 |
// Less than 64 bytes to go |
|
681 |
// |
|
682 |
asm("its_smaller_back: ");
|
|
683 |
asm(" movs ip, r2, lsl #26 "); // r2 = remaining length (<256) << 24
|
|
684 |
asm(" beq mem_copy_end2 "); // skip if remaining length zero
|
|
685 |
asm(" msr cpsr_flg, ip ");
|
|
686 |
asm(" ldmmidb r1!, {r3-r10} ");
|
|
687 |
asm(" stmmidb r0!, {r3-r10} "); // copy 32
|
|
688 |
asm(" ldmeqdb r1!, {r3-r6} ");
|
|
689 |
asm(" ldmcsdb r1!, {r7,r8} ");
|
|
690 |
asm(" ldrvs r9, [r1, #-4]! ");
|
|
691 |
asm(" stmeqdb r0!, {r3-r6} "); // copy 16
|
|
692 |
asm(" stmcsdb r0!, {r7,r8} "); // copy 8
|
|
693 |
asm(" strvs r9, [r0, #-4]! "); // copy 4
|
|
694 |
||
695 |
asm(" movs ip, r2, lsl #30 ");
|
|
696 |
asm(" bne smallest_copy_back ");
|
|
697 |
||
698 |
asm("mem_copy_end2: ");
|
|
699 |
__POPRET("r0,r4-r11,");
|
|
700 |
||
701 |
||
702 |
// |
|
703 |
// Less than 4 bytes to go... |
|
704 |
// |
|
705 |
||
706 |
asm("smallest_copy_back: ");
|
|
707 |
asm(" msr cpsr_flg, ip ");
|
|
708 |
asm(" ldrmih r3, [r1, #-2]! ");
|
|
709 |
asm(" ldreqb r4, [r1, #-1]! ");
|
|
710 |
asm(" strmih r3, [r0, #-2]! "); // copy 2
|
|
711 |
asm(" streqb r4, [r0, #-1]! "); // copy 1
|
|
712 |
__POPRET("r0,r4-r11,");
|
|
713 |
||
714 |
||
715 |
// |
|
716 |
// Do byte moves if necessary to word-align destination |
|
717 |
// |
|
718 |
asm("dest_unaligned_back: ");
|
|
719 |
asm(" msr cpsr_flg, r3 "); // destination alignment in r3 into N,Z flags
|
|
720 |
asm(" ldrmib r4, [r1, #-1]! "); // do byte moves to align destination
|
|
721 |
asm(" ldrmib r5, [r1, #-1]! ");
|
|
722 |
asm(" ldreqb r6, [r1, #-1]! ");
|
|
723 |
asm(" sub r2, r2, r3, lsr #30 "); // adjust length, at least 13 bytes remaining
|
|
724 |
asm(" strmib r4, [r0, #-1]! ");
|
|
725 |
asm(" strmib r5, [r0, #-1]! ");
|
|
726 |
asm(" streqb r6, [r0, #-1]! ");
|
|
727 |
asm(" b dest_aligned_back ");
|
|
728 |
||
729 |
||
730 |
// |
|
731 |
// Large backwards copy, length >= 64 |
|
732 |
// |
|
733 |
||
734 |
asm("large_copy_back: ");
|
|
735 |
asm(" movs ip, r2, lsr #6 ");
|
|
736 |
asm("1: ");
|
|
737 |
PLD_noff(1, 65); |
|
738 |
PLD_noff(1, 33); |
|
739 |
asm(" ldmdb r1!, {r3-r10} "); // Copy 64
|
|
740 |
asm(" stmdb r0!, {r3-r10} ");
|
|
741 |
asm(" ldmdb r1!, {r3-r10} ");
|
|
742 |
asm(" subs ip, ip, #1 ");
|
|
743 |
asm(" stmdb r0!, {r3-r10} ");
|
|
744 |
asm(" bne 1b ");
|
|
745 |
asm(" and r2, r2, #63 ");
|
|
746 |
asm(" b its_smaller_back ");
|
|
747 |
||
748 |
// |
|
749 |
// Backwards unlaigned copy |
|
750 |
// |
|
751 |
||
752 |
asm("copy_back_nonaligned: ");
|
|
753 |
// |
|
754 |
// superalign |
|
755 |
// |
|
756 |
asm(" bic r1, r1, #3 "); // align source
|
|
757 |
asm(" ldr r3, [r1] "); // get first word
|
|
758 |
asm(" mov r12, r12, lsl #3 "); // r12 = 8*source alignment
|
|
759 |
asm(" ands r4, r0, #31 "); // r4 = bytes to align dest to 32
|
|
760 |
asm(" beq bunal_already_aligned "); // skip if already aligned
|
|
761 |
asm(" cmp r2, r4 "); // check if length big enough to align to 32
|
|
762 |
asm(" blo copy_back_remainder "); // skip if too small
|
|
763 |
asm(" sub r2, r2, r4 "); // adjust length
|
|
764 |
asm(" rsb r6, r12, #32 "); // r6 = 32 - 8*source alignment
|
|
765 |
||
766 |
asm("1: ");
|
|
767 |
asm(" mov r5, r3, lsl r6 "); // r5 = part of previous source word required to make destination word
|
|
768 |
asm(" ldr r3, [r1, #-4]! "); // get next word
|
|
769 |
asm(" subs r4, r4, #4 "); // 4 bytes less to do
|
|
770 |
asm(" orr r5, r5, r3, lsr r12 "); // form next destination word
|
|
771 |
asm(" str r5, [r0, #-4]! "); // and store it
|
|
772 |
asm(" bne 1b "); // loop until destination 32 byte aligned
|
|
773 |
||
774 |
asm("bunal_already_aligned: "); // destination now aligned to 32 bytes
|
|
775 |
asm(" movs lr, r2, lsr #5 "); // lr=number of 32-byte blocks
|
|
776 |
asm(" beq copy_back_remainder "); // skip if length < 32
|
|
777 |
||
778 |
asm(" cmp r12, #16 ");
|
|
779 |
asm(" beq copy_back_nonaligned_2 "); // branch if source = 2 mod 4
|
|
780 |
asm(" bhi copy_back_nonaligned_3 "); // branch if source = 3 mod 4, else source = 1 mod 4
|
|
781 |
||
782 |
// source = 1 mod 4 |
|
783 |
asm("copy_back_nonaligned_1: ");
|
|
784 |
asm(" mov r11, r3, lsl #24 ");
|
|
785 |
asm(" ldmdb r1!, {r3-r10} ");
|
|
786 |
PLD_noff(1, 64); |
|
787 |
asm(" orr r11, r11, r10, lsr #8 ");
|
|
788 |
asm(" mov r10, r10, lsl #24 ");
|
|
789 |
asm(" orr r10, r10, r9, lsr #8 ");
|
|
790 |
asm(" mov r9, r9, lsl #24 ");
|
|
791 |
asm(" orr r9, r9, r8, lsr #8 ");
|
|
792 |
asm(" mov r8, r8, lsl #24 ");
|
|
793 |
asm(" orr r8, r8, r7, lsr #8 ");
|
|
794 |
asm(" mov r7, r7, lsl #24 ");
|
|
795 |
asm(" orr r7, r7, r6, lsr #8 ");
|
|
796 |
asm(" mov r6, r6, lsl #24 ");
|
|
797 |
asm(" orr r6, r6, r5, lsr #8 ");
|
|
798 |
asm(" mov r5, r5, lsl #24 ");
|
|
799 |
asm(" orr r5, r5, r4, lsr #8 ");
|
|
800 |
asm(" mov r4, r4, lsl #24 ");
|
|
801 |
asm(" orr r4, r4, r3, lsr #8 ");
|
|
802 |
asm(" stmdb r0!, {r4-r11} ");
|
|
803 |
asm(" subs lr, lr, #1 ");
|
|
804 |
asm(" bne copy_back_nonaligned_1 ");
|
|
805 |
asm(" b copy_back_remainder ");
|
|
806 |
||
807 |
// source = 2 mod 4 |
|
808 |
asm("copy_back_nonaligned_2: ");
|
|
809 |
asm(" mov r11, r3, lsl #16 ");
|
|
810 |
asm(" ldmdb r1!, {r3-r10} ");
|
|
811 |
PLD_noff(1, 64); |
|
812 |
asm(" orr r11, r11, r10, lsr #16 ");
|
|
813 |
asm(" mov r10, r10, lsl #16 ");
|
|
814 |
asm(" orr r10, r10, r9, lsr #16 ");
|
|
815 |
asm(" mov r9, r9, lsl #16 ");
|
|
816 |
asm(" orr r9, r9, r8, lsr #16 ");
|
|
817 |
asm(" mov r8, r8, lsl #16 ");
|
|
818 |
asm(" orr r8, r8, r7, lsr #16 ");
|
|
819 |
asm(" mov r7, r7, lsl #16 ");
|
|
820 |
asm(" orr r7, r7, r6, lsr #16 ");
|
|
821 |
asm(" mov r6, r6, lsl #16 ");
|
|
822 |
asm(" orr r6, r6, r5, lsr #16 ");
|
|
823 |
asm(" mov r5, r5, lsl #16 ");
|
|
824 |
asm(" orr r5, r5, r4, lsr #16 ");
|
|
825 |
asm(" mov r4, r4, lsl #16 ");
|
|
826 |
asm(" orr r4, r4, r3, lsr #16 ");
|
|
827 |
asm(" stmdb r0!, {r4-r11} ");
|
|
828 |
asm(" subs lr, lr, #1 ");
|
|
829 |
asm(" bne copy_back_nonaligned_2 ");
|
|
830 |
asm(" b copy_back_remainder ");
|
|
831 |
||
832 |
// source = 3 mod 4 |
|
833 |
asm("copy_back_nonaligned_3: ");
|
|
834 |
asm(" mov r11, r3, lsl #8 ");
|
|
835 |
asm(" ldmdb r1!, {r3-r10} ");
|
|
836 |
PLD_noff(1, 64); |
|
837 |
asm(" orr r11, r11, r10, lsr #24 ");
|
|
838 |
asm(" mov r10, r10, lsl #8 ");
|
|
839 |
asm(" orr r10, r10, r9, lsr #24 ");
|
|
840 |
asm(" mov r9, r9, lsl #8 ");
|
|
841 |
asm(" orr r9, r9, r8, lsr #24 ");
|
|
842 |
asm(" mov r8, r8, lsl #8 ");
|
|
843 |
asm(" orr r8, r8, r7, lsr #24 ");
|
|
844 |
asm(" mov r7, r7, lsl #8 ");
|
|
845 |
asm(" orr r7, r7, r6, lsr #24 ");
|
|
846 |
asm(" mov r6, r6, lsl #8 ");
|
|
847 |
asm(" orr r6, r6, r5, lsr #24 ");
|
|
848 |
asm(" mov r5, r5, lsl #8 ");
|
|
849 |
asm(" orr r5, r5, r4, lsr #24 ");
|
|
850 |
asm(" mov r4, r4, lsl #8 ");
|
|
851 |
asm(" orr r4, r4, r3, lsr #24 ");
|
|
852 |
asm(" stmdb r0!, {r4-r11} ");
|
|
853 |
asm(" subs lr, lr, #1 ");
|
|
854 |
asm(" bne copy_back_nonaligned_3 ");
|
|
855 |
||
856 |
// <32 bytes to go, source alignment could be 1, 2 or 3 mod 4 |
|
857 |
// r12 = 8 * (source mod 4) |
|
858 |
asm("copy_back_remainder: ");
|
|
859 |
asm(" ands r4, r2, #0x1c "); // r4 = 4*number of words left
|
|
860 |
asm(" beq 2f "); // skip if none
|
|
861 |
asm(" rsb r6, r12, #32 "); // r6 = 32 - 8*source alignment
|
|
862 |
||
863 |
asm("1: ");
|
|
864 |
asm(" mov r5, r3, lsl r6 "); // r5 = part of previous source word required to make destination word
|
|
865 |
asm(" ldr r3, [r1, #-4]! "); // get next word
|
|
866 |
asm(" subs r4, r4, #4 "); // 4 bytes less to do
|
|
867 |
asm(" orr r5, r5, r3, lsr r12 "); // form next destination word
|
|
868 |
asm(" str r5, [r0, #-4]! "); // and store it
|
|
869 |
asm(" bne 1b "); // loop until destination 32 byte aligned
|
|
870 |
||
871 |
asm("2: ");
|
|
872 |
asm(" add r1, r1, r12, lsr #3 "); // r1 = real unaligned source address
|
|
873 |
asm(" tst r2, #2 "); // 2 bytes left?
|
|
874 |
asm(" ldrneb r3, [r1, #-1]! "); // copy 2
|
|
875 |
asm(" strneb r3, [r0, #-1]! ");
|
|
876 |
asm(" ldrneb r3, [r1, #-1]! ");
|
|
877 |
asm(" strneb r3, [r0, #-1]! ");
|
|
878 |
asm(" tst r2, #1 "); // 1 byte left?
|
|
879 |
asm(" ldrneb r3, [r1, #-1]! "); // copy 1
|
|
880 |
asm(" strneb r3, [r0, #-1]! ");
|
|
881 |
__POPRET("r0,r4-r11,");
|
|
882 |
} |
|
883 |
||
884 |
#endif // USE_REPLACEMENT_MEMCPY |
|
885 |
||
886 |
||
887 |
#ifndef __KERNEL_MODE__ |
|
888 |
#ifdef __GCC32__ |
|
889 |
/** |
|
890 |
Compares a block of data at one specified location with a block of data at |
|
891 |
another specified location. |
|
892 |
||
893 |
The comparison proceeds on a byte for byte basis, the result of the comparison |
|
894 |
is based on the difference of the first bytes to disagree. |
|
895 |
||
896 |
The data at the two locations are equal if they have the same length and content. |
|
897 |
Where the lengths are different and the shorter section of data is the same |
|
898 |
as the first part of the longer section of data, the shorter is considered |
|
899 |
to be less than the longer. |
|
900 |
||
901 |
@param aLeft A pointer to the first (or left) block of 8 bit data |
|
902 |
to be compared. |
|
903 |
@param aLeftL The length of the first (or left) block of data to be compared, |
|
904 |
i.e. the number of bytes. |
|
905 |
@param aRight A pointer to the second (or right) block of 8 bit data to be |
|
906 |
compared. |
|
907 |
@param aRightL The length of the second (or right) block of data to be compared |
|
908 |
i.e. the number of bytes. |
|
909 |
||
910 |
@return Positive, if the first (or left) block of data is greater than the |
|
911 |
second (or right) block of data. |
|
912 |
Negative, if the first (or left) block of data is less than the |
|
913 |
second (or right) block of data. |
|
914 |
Zero, if both the first (or left) and second (or right) blocks of data |
|
915 |
have the same length and the same content. |
|
916 |
*/ |
|
917 |
EXPORT_C __NAKED__ TInt Mem::Compare(const TUint8* /*aLeft*/, TInt /*aLeftL*/, const TUint8* /*aRight*/, TInt /*aRightL*/) |
|
918 |
{
|
|
919 |
// fall through |
|
920 |
} |
|
921 |
#endif |
|
922 |
#endif |
|
923 |
||
924 |
||
925 |
||
926 |
// See header file e32cmn.h for the in-source documentation. |
|
927 |
extern "C" EXPORT_C __NAKED__ TInt memcompare(const TUint8* /*aLeft*/, TInt /*aLeftL*/, const TUint8* /*aRight*/, TInt /*aRightL*/) |
|
928 |
// |
|
929 |
// Compares until the smaller of the two lengths is reached. |
|
930 |
// If the lengths differ, returns leftlen-rightlen |
|
931 |
// If a difference is encountered, returns left byte-right byte |
|
932 |
// |
|
933 |
{
|
|
934 |
||
935 |
asm(" stmfd sp!,{r4,r5,r6,lr}");
|
|
936 |
asm(" mov r4,r0");
|
|
937 |
// |
|
938 |
// Get the shorter of the two lengths, and check for zero length |
|
939 |
// |
|
940 |
asm(" cmp r1,r3");
|
|
941 |
asm(" mov r6,r1");
|
|
942 |
asm(" movge r6,r3");
|
|
943 |
asm(" cmp r6,#0");
|
|
944 |
asm(" beq compare_done");
|
|
945 |
asm(" cmp r6,#16");
|
|
946 |
// |
|
947 |
// Check for aligned buffers for faster comparing if more than 16 bytes |
|
948 |
// |
|
949 |
asm(" andge r0,r4,#3");
|
|
950 |
asm(" andge r5,r2,#3");
|
|
951 |
asm(" addlt r0,r5,#1");
|
|
952 |
asm(" cmp r0,r5");
|
|
953 |
asm(" beq aligned_compare");
|
|
954 |
// |
|
955 |
// Get aLeft+Min(aLeftL,aRightL) |
|
956 |
// |
|
957 |
asm(" add r6,r4,r6");
|
|
958 |
||
959 |
asm("compare_loop:");
|
|
960 |
asm(" ldrb r0,[r4],#1");
|
|
961 |
asm(" ldrb r5,[r2],#1");
|
|
962 |
asm(" subs r0,r0,r5");
|
|
963 |
asm("bne compare_exit ");
|
|
964 |
asm(" cmp r4,r6");
|
|
965 |
asm(" beq compare_done");
|
|
966 |
||
967 |
asm(" ldrb r0,[r4],#1");
|
|
968 |
asm(" ldrb r5,[r2],#1");
|
|
969 |
asm(" subs r0,r0,r5");
|
|
970 |
asm("bne compare_exit ");
|
|
971 |
asm(" cmp r4,r6");
|
|
972 |
asm(" beq compare_done");
|
|
973 |
||
974 |
asm(" ldrb r0,[r4],#1");
|
|
975 |
asm(" ldrb r5,[r2],#1");
|
|
976 |
asm(" subs r0,r0,r5");
|
|
977 |
asm("bne compare_exit ");
|
|
978 |
asm(" cmp r4,r6");
|
|
979 |
asm(" beq compare_done");
|
|
980 |
||
981 |
asm(" ldrb r0,[r4],#1");
|
|
982 |
asm(" ldrb r5,[r2],#1");
|
|
983 |
asm(" subs r0,r0,r5");
|
|
984 |
asm("bne compare_exit ");
|
|
985 |
asm(" cmp r4,r6");
|
|
986 |
asm(" bne compare_loop");
|
|
987 |
// |
|
988 |
// Return difference of lengths |
|
989 |
// |
|
990 |
asm("compare_done:");
|
|
991 |
asm(" sub r0,r1,r3");
|
|
992 |
||
993 |
asm("compare_exit:");
|
|
994 |
__POPRET("r4-r6,");
|
|
995 |
// |
|
996 |
// Compare byte at a time until word aligned... |
|
997 |
// |
|
998 |
asm("aligned_compare:");
|
|
999 |
// |
|
1000 |
// Get number of bytes to compare before word alignment reached...and jump to appropriate point |
|
1001 |
// |
|
1002 |
asm(" mov ip,r6");
|
|
1003 |
asm(" add r6,r4,r6");
|
|
1004 |
asm(" subs r0,r0,#1");
|
|
1005 |
asm(" movmi r0,#3");
|
|
1006 |
asm(" rsb r5,r0,#3");
|
|
1007 |
asm(" sub ip,ip,r5");
|
|
1008 |
asm(" mov ip,ip,lsr #2");
|
|
1009 |
asm(" add pc,pc,r0,asl #4");
|
|
1010 |
asm(" b compare_done"); // Never executed
|
|
1011 |
// |
|
1012 |
// Jump here if alignment is 1. Do not use more than 4 instructions without altering above relative jump |
|
1013 |
// |
|
1014 |
asm(" ldrb r0,[r4],#1");
|
|
1015 |
asm(" ldrb r5,[r2],#1");
|
|
1016 |
asm(" subs r0,r0,r5");
|
|
1017 |
asm("bne compare_exit ");
|
|
1018 |
// |
|
1019 |
// Jump here if alignment is 2. Do not use more than 4 instructions without altering above relative jump |
|
1020 |
// |
|
1021 |
asm(" ldrb r0,[r4],#1");
|
|
1022 |
asm(" ldrb r5,[r2],#1");
|
|
1023 |
asm(" subs r0,r0,r5");
|
|
1024 |
asm("bne compare_exit ");
|
|
1025 |
// |
|
1026 |
// Jump here if alignment is 3. Do not use more than 4 instructions without altering above relative jump |
|
1027 |
// |
|
1028 |
asm(" ldrb r0,[r4],#1");
|
|
1029 |
asm(" ldrb r5,[r2],#1");
|
|
1030 |
asm(" subs r0,r0,r5");
|
|
1031 |
asm("bne compare_exit ");
|
|
1032 |
// |
|
1033 |
// Must now be word aligned |
|
1034 |
// |
|
1035 |
asm("aligned_compare_loop:");
|
|
1036 |
asm(" ldr r0,[r4],#4");
|
|
1037 |
asm(" ldr r5,[r2],#4");
|
|
1038 |
asm(" eors r0,r0,r5");
|
|
1039 |
asm(" bne word_different");
|
|
1040 |
asm(" subs ip,ip,#1");
|
|
1041 |
asm(" bne aligned_compare_loop");
|
|
1042 |
// |
|
1043 |
// Less than 4 bytes to go... |
|
1044 |
// |
|
1045 |
asm(" cmp r4,r6");
|
|
1046 |
asm(" bne compare_loop");
|
|
1047 |
asm(" sub r0,r1,r3");
|
|
1048 |
__POPRET("r4-r6,");
|
|
1049 |
// |
|
1050 |
// A difference encountered while word comparing, find out which byte it was |
|
1051 |
// |
|
1052 |
asm("word_different:");
|
|
1053 |
asm(" ldrb r0,[r4,#-4]");
|
|
1054 |
asm(" ldrb r5,[r2,#-4]");
|
|
1055 |
asm(" subs r0,r0,r5");
|
|
1056 |
asm("bne compare_exit ");
|
|
1057 |
asm(" ldrb r0,[r4,#-3]");
|
|
1058 |
asm(" ldrb r5,[r2,#-3]");
|
|
1059 |
asm(" subs r0,r0,r5");
|
|
1060 |
asm("bne compare_exit ");
|
|
1061 |
asm(" ldrb r0,[r4,#-2]");
|
|
1062 |
asm(" ldrb r5,[r2,#-2]");
|
|
1063 |
asm(" subs r0,r0,r5");
|
|
1064 |
asm("bne compare_exit ");
|
|
1065 |
// |
|
1066 |
// This must be the different byte... |
|
1067 |
// |
|
1068 |
asm(" ldrb r0,[r4,#-1]");
|
|
1069 |
asm(" ldrb r5,[r2,#-1]");
|
|
1070 |
asm(" sub r0,r0,r5");
|
|
1071 |
__POPRET("r4-r6,");
|
|
1072 |
} |
|
1073 |
#endif |
|
1074 |