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* libc/machine/arm/memcpy.S: Fix unaligned access copying.

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This commit is contained in:
Nick Clifton 2011-10-04 16:02:25 +00:00
parent 35ddfc9e28
commit de0ae33544
2 changed files with 14 additions and 4 deletions
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4
newlib/ChangeLog
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@ -1,3 +1,7 @@
2011-10-04 Nick Clifton <nickc@redhat.com>
* libc/machine/arm/memcpy.S: Fix unaligned access copying.
2011-09-29 Greta Yorsh <Greta.Yorsh@arm.com> 2011-09-29 Greta Yorsh <Greta.Yorsh@arm.com>
* libc/machine/arm/memcpy.S: New file. Contains a hand coded * libc/machine/arm/memcpy.S: New file. Contains a hand coded

14
newlib/libc/machine/arm/memcpy.S
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@ -364,7 +364,7 @@ src_not_word_aligned:
#ifdef __ARM_FEATURE_UNALIGNED #ifdef __ARM_FEATURE_UNALIGNED
/* Copy word by word using LDR when alignment can be done in hardware, /* Copy word by word using LDR when alignment can be done in hardware,
i.e., SCTLR.A is set, supporting unaligned access in LDR and STR. */ i.e., SCTLR.A is set, supporting unaligned access in LDR and STR. */
cmp r2, #60 subs r2, r2, #60
blt 8f blt 8f
7: 7:
@ -380,12 +380,18 @@ src_not_word_aligned:
bge 7b bge 7b
8: 8:
/* Get here if there is less than 64 btyes to copy, /* Get here if less than 64 bytes to copy, -64 <= r2 < 0.
where the number of bytes to copy is r2 + 4. */ Check if there is more than 3 bytes to copy. */
adds r2, r2, #60
blt copy_less_than_4
9:
/* Get here if there is less than 64 but at least 4 bytes to copy,
where the number of bytes to copy is r2+4. */
ldr r3, [r1], #4 ldr r3, [r1], #4
str r3, [r0], #4 str r3, [r0], #4
subs r2, r2, #4 subs r2, r2, #4
bge 8b bge 9b
b copy_less_than_4 b copy_less_than_4