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| author | Olivier Martin <olivier.martin@arm.com> | 2014-01-15 12:24:31 +0000 |
|---|---|---|
| committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2014-01-15 12:24:31 +0000 |
| commit | cf9530e6864f87e58c1c65b5a1198586700f7182 (patch) | |
| tree | d413a5221b97bf6867b983a4443cc6374f463cef /ArmPkg/Library/CompilerIntrinsicsLib | |
| parent | 92720fe9c9c42a3a8e32958f53f7bf10c0679e06 (diff) | |
| download | edk2-cf9530e6864f87e58c1c65b5a1198586700f7182.zip edk2-cf9530e6864f87e58c1c65b5a1198586700f7182.tar.gz edk2-cf9530e6864f87e58c1c65b5a1198586700f7182.tar.bz2 | |
ArmPkg/CompilerIntrinsicsLib: Make __aeabi_memcpy the same as memcpy
This code also removed some redundant instructions.
__aeabi_memcpy doesn't require preservation of r0 (as memcpy does),
which could save a push, but the code has been left to keep things consistent.
The reason __aeabi_memcpy has been added to the .S file is so it will be available
to toolchains that use the GCC assembler but the full ARM EABI (i.e. current LLVM)
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15124 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPkg/Library/CompilerIntrinsicsLib')
| -rw-r--r-- | ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.S | 20 | ||||
| -rw-r--r-- | ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.asm | 23 |
2 files changed, 21 insertions, 22 deletions
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.S b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.S index 07e0cd6..b68ed8a 100644 --- a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.S +++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.S @@ -1,4 +1,4 @@ -#------------------------------------------------------------------------------
+#------------------------------------------------------------------------------
#
# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
#
@@ -14,21 +14,19 @@ .text
.align 2
+ GCC_ASM_EXPORT(__aeabi_memcpy)
GCC_ASM_EXPORT(memcpy)
+ASM_PFX(__aeabi_memcpy):
ASM_PFX(memcpy):
- stmfd sp!, {r7, lr}
- mov ip, #0
- add r7, sp, #0
- mov lr, r0
- b L4
+ cmp r2, #0
+ bxeq lr
+ push {lr}
+ mov lr, r0
L5:
ldrb r3, [r1], #1 @ zero_extendqisi2
- add ip, ip, #1
- and r3, r3, #255
strb r3, [lr], #1
-L4:
- cmp ip, r2
+ subs r2, r2, #1
bne L5
- ldmfd sp!, {r7, pc}
+ pop {pc}
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.asm b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.asm index e01b80d..f81db28 100644 --- a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.asm +++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy.asm @@ -1,4 +1,4 @@ -//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
//
// Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
//
@@ -27,14 +27,15 @@ ; );
;
__aeabi_memcpy
- CMP r2, #0
- BXEQ r14
-loop
- LDRB r3, [r1], #1
- STRB r3, [r0], #1
- SUBS r2, r2, #1
- BXEQ r14
- B loop
-
- END
+ cmp r2, #0
+ bxeq lr
+ push {lr}
+ mov lr, r0
+L5
+ ldrb r3, [r1], #1
+ strb r3, [lr], #1
+ subs r2, r2, #1
+ bne L5
+ pop {pc}
+ END
\ No newline at end of file |