diff options
author | Andre McCurdy <armccurdy@gmail.com> | 2020-01-21 10:52:15 -0800 |
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committer | Rich Felker <dalias@aerifal.cx> | 2020-06-25 19:11:13 -0400 |
commit | 9dce93ac7f7a76978b70581c6f073f671b583347 (patch) | |
tree | c6c36ceb8ceb10575af4af066fb19072df55d384 /src/string/arm | |
parent | 8ed2bd8bfcb4ea6448afb55a941f4b5b2b0398c0 (diff) | |
download | musl-9dce93ac7f7a76978b70581c6f073f671b583347.tar.gz musl-9dce93ac7f7a76978b70581c6f073f671b583347.tar.bz2 musl-9dce93ac7f7a76978b70581c6f073f671b583347.tar.xz musl-9dce93ac7f7a76978b70581c6f073f671b583347.zip |
add big-endian support to ARM assembler memcpy
Allow the existing ARM assembler memcpy implementation to be used for
both big and little endian targets.
Diffstat (limited to 'src/string/arm')
-rw-r--r-- | src/string/arm/memcpy.S (renamed from src/string/arm/memcpy_le.S) | 101 | ||||
-rw-r--r-- | src/string/arm/memcpy.c | 3 |
2 files changed, 97 insertions, 7 deletions
diff --git a/src/string/arm/memcpy_le.S b/src/string/arm/memcpy.S index 7b35d305..869e3448 100644 --- a/src/string/arm/memcpy_le.S +++ b/src/string/arm/memcpy.S @@ -1,5 +1,3 @@ -#if !__ARMEB__ - /* * Copyright (C) 2008 The Android Open Source Project * All rights reserved. @@ -42,7 +40,7 @@ * code safely callable from thumb mode, adjusting the return * instructions to be compatible with pre-thumb ARM cpus, removal of * prefetch code that is not compatible with older cpus and support for - * building as thumb 2. + * building as thumb 2 and big-endian. */ .syntax unified @@ -227,24 +225,45 @@ non_congruent: * becomes aligned to 32 bits (r5 = nb of words to copy for alignment) */ movs r5, r5, lsl #31 + +#if __ARMEB__ + movmi r3, r3, ror #24 + strbmi r3, [r0], #1 + movcs r3, r3, ror #24 + strbcs r3, [r0], #1 + movcs r3, r3, ror #24 + strbcs r3, [r0], #1 +#else strbmi r3, [r0], #1 movmi r3, r3, lsr #8 strbcs r3, [r0], #1 movcs r3, r3, lsr #8 strbcs r3, [r0], #1 movcs r3, r3, lsr #8 +#endif cmp r2, #4 blo partial_word_tail +#if __ARMEB__ + mov r3, r3, lsr r12 + mov r3, r3, lsl r12 +#endif + /* Align destination to 32 bytes (cache line boundary) */ 1: tst r0, #0x1c beq 2f ldr r5, [r1], #4 sub r2, r2, #4 +#if __ARMEB__ + mov r4, r5, lsr lr + orr r4, r4, r3 + mov r3, r5, lsl r12 +#else mov r4, r5, lsl lr orr r4, r4, r3 mov r3, r5, lsr r12 +#endif str r4, [r0], #4 cmp r2, #4 bhs 1b @@ -270,6 +289,25 @@ loop16: ldmia r1!, { r5,r6,r7, r8,r9,r10,r11} subs r2, r2, #32 ldrhs r12, [r1], #4 +#if __ARMEB__ + orr r3, r3, r4, lsr #16 + mov r4, r4, lsl #16 + orr r4, r4, r5, lsr #16 + mov r5, r5, lsl #16 + orr r5, r5, r6, lsr #16 + mov r6, r6, lsl #16 + orr r6, r6, r7, lsr #16 + mov r7, r7, lsl #16 + orr r7, r7, r8, lsr #16 + mov r8, r8, lsl #16 + orr r8, r8, r9, lsr #16 + mov r9, r9, lsl #16 + orr r9, r9, r10, lsr #16 + mov r10, r10, lsl #16 + orr r10, r10, r11, lsr #16 + stmia r0!, {r3,r4,r5,r6, r7,r8,r9,r10} + mov r3, r11, lsl #16 +#else orr r3, r3, r4, lsl #16 mov r4, r4, lsr #16 orr r4, r4, r5, lsl #16 @@ -287,6 +325,7 @@ loop16: orr r10, r10, r11, lsl #16 stmia r0!, {r3,r4,r5,r6, r7,r8,r9,r10} mov r3, r11, lsr #16 +#endif bhs 1b b less_than_thirtytwo @@ -296,6 +335,25 @@ loop8: ldmia r1!, { r5,r6,r7, r8,r9,r10,r11} subs r2, r2, #32 ldrhs r12, [r1], #4 +#if __ARMEB__ + orr r3, r3, r4, lsr #24 + mov r4, r4, lsl #8 + orr r4, r4, r5, lsr #24 + mov r5, r5, lsl #8 + orr r5, r5, r6, lsr #24 + mov r6, r6, lsl #8 + orr r6, r6, r7, lsr #24 + mov r7, r7, lsl #8 + orr r7, r7, r8, lsr #24 + mov r8, r8, lsl #8 + orr r8, r8, r9, lsr #24 + mov r9, r9, lsl #8 + orr r9, r9, r10, lsr #24 + mov r10, r10, lsl #8 + orr r10, r10, r11, lsr #24 + stmia r0!, {r3,r4,r5,r6, r7,r8,r9,r10} + mov r3, r11, lsl #8 +#else orr r3, r3, r4, lsl #24 mov r4, r4, lsr #8 orr r4, r4, r5, lsl #24 @@ -313,6 +371,7 @@ loop8: orr r10, r10, r11, lsl #24 stmia r0!, {r3,r4,r5,r6, r7,r8,r9,r10} mov r3, r11, lsr #8 +#endif bhs 1b b less_than_thirtytwo @@ -322,6 +381,25 @@ loop24: ldmia r1!, { r5,r6,r7, r8,r9,r10,r11} subs r2, r2, #32 ldrhs r12, [r1], #4 +#if __ARMEB__ + orr r3, r3, r4, lsr #8 + mov r4, r4, lsl #24 + orr r4, r4, r5, lsr #8 + mov r5, r5, lsl #24 + orr r5, r5, r6, lsr #8 + mov r6, r6, lsl #24 + orr r6, r6, r7, lsr #8 + mov r7, r7, lsl #24 + orr r7, r7, r8, lsr #8 + mov r8, r8, lsl #24 + orr r8, r8, r9, lsr #8 + mov r9, r9, lsl #24 + orr r9, r9, r10, lsr #8 + mov r10, r10, lsl #24 + orr r10, r10, r11, lsr #8 + stmia r0!, {r3,r4,r5,r6, r7,r8,r9,r10} + mov r3, r11, lsl #24 +#else orr r3, r3, r4, lsl #8 mov r4, r4, lsr #24 orr r4, r4, r5, lsl #8 @@ -339,6 +417,7 @@ loop24: orr r10, r10, r11, lsl #8 stmia r0!, {r3,r4,r5,r6, r7,r8,r9,r10} mov r3, r11, lsr #24 +#endif bhs 1b less_than_thirtytwo: @@ -350,9 +429,15 @@ less_than_thirtytwo: 1: ldr r5, [r1], #4 sub r2, r2, #4 +#if __ARMEB__ + mov r4, r5, lsr lr + orr r4, r4, r3 + mov r3, r5, lsl r12 +#else mov r4, r5, lsl lr orr r4, r4, r3 mov r3, r5, lsr r12 +#endif str r4, [r0], #4 cmp r2, #4 bhs 1b @@ -360,11 +445,20 @@ less_than_thirtytwo: partial_word_tail: /* we have a partial word in the input buffer */ movs r5, lr, lsl #(31-3) +#if __ARMEB__ + movmi r3, r3, ror #24 + strbmi r3, [r0], #1 + movcs r3, r3, ror #24 + strbcs r3, [r0], #1 + movcs r3, r3, ror #24 + strbcs r3, [r0], #1 +#else strbmi r3, [r0], #1 movmi r3, r3, lsr #8 strbcs r3, [r0], #1 movcs r3, r3, lsr #8 strbcs r3, [r0], #1 +#endif /* Refill spilled registers from the stack. Don't update sp. */ ldmfd sp, {r5-r11} @@ -383,4 +477,3 @@ copy_last_3_and_return: ldmfd sp!, {r0, r4, lr} bx lr -#endif diff --git a/src/string/arm/memcpy.c b/src/string/arm/memcpy.c deleted file mode 100644 index 041614f4..00000000 --- a/src/string/arm/memcpy.c +++ /dev/null @@ -1,3 +0,0 @@ -#if __ARMEB__ -#include "../memcpy.c" -#endif |