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MdePkg/BaseMemoryLibOptDxe ARM: fix arithmetic bugs in CompareMem()

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Fix two bugs:
- Erroneous shift of 2 in a bytes to bits conversion.
- Use reverse subtract rather than negate for value that is subsequently
  used as operand #2 in a shift operation.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Ard Biesheuvel 2016-09-13 18:22:33 +01:00
parent 93638568c1
commit 60fe5e8a9c
1 changed files with 2 additions and 2 deletions
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4
MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareMem.S
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@ -110,9 +110,9 @@ ASM_PFX(InternalMemCompareMem):
bic src1, src1, #3 bic src1, src1, #3
bic src2, src2, #3 bic src2, src2, #3
add limit, limit, tmp1 // Adjust the limit for the extra. add limit, limit, tmp1 // Adjust the limit for the extra.
lsl tmp1, tmp1, #2 // Bytes beyond alignment -> bits. lsl tmp1, tmp1, #3 // Bytes beyond alignment -> bits.
ldr data1, [src1], #4 ldr data1, [src1], #4
neg tmp1, tmp1 // Bits to alignment -32. rsb tmp1, tmp1, #32 // Bits to alignment -32.
ldr data2, [src2], #4 ldr data2, [src2], #4
mov tmp2, #~0 mov tmp2, #~0