[coreboot-gerrit] Patch set updated for coreboot: b6e43c0 libpayload: get rid of GPL'd code
Patrick Georgi (pgeorgi@google.com)
gerrit at coreboot.org
Thu Jun 4 10:42:13 CEST 2015
Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/10413
-gerrit
commit b6e43c00ef45b93756bae42045afb21f3e6640a7
Author: Patrick Georgi <patrick at georgi-clan.de>
Date: Thu Jun 4 00:44:59 2015 +0200
libpayload: get rid of GPL'd code
Replace optimized memory/string handling that came from Linux under GPLv2 with
implementations from OpenBSD to simplify libpayload's licensing situation.
Since those are all uses of the GPL flag in the configuration, remove it.
(still untested. need to check if the calling convention is the same)
Change-Id: I7c5e070e842bd4a32f1b0821d7ed2d1932ecd6ca
Signed-off-by: Patrick Georgi <patrick at georgi-clan.de>
---
payloads/libpayload/Config.in | 9 -
payloads/libpayload/LICENSES | 13 +-
payloads/libpayload/arch/arm/Makefile.inc | 3 +-
payloads/libpayload/arch/arm/_memcpy.S | 462 ++++++++++++++++++++++++++++++
payloads/libpayload/arch/arm/asmlib.h | 72 -----
payloads/libpayload/arch/arm/memcpy.S | 265 +++--------------
payloads/libpayload/arch/arm/memmove.S | 221 ++------------
payloads/libpayload/arch/arm/memset.S | 220 +++++++-------
payloads/libpayload/arch/x86/Makefile.inc | 5 +-
payloads/libpayload/arch/x86/memmove.S | 106 +++++++
payloads/libpayload/arch/x86/memset.S | 54 ++++
payloads/libpayload/arch/x86/string.c | 102 -------
12 files changed, 810 insertions(+), 722 deletions(-)
diff --git a/payloads/libpayload/Config.in b/payloads/libpayload/Config.in
index 92c89ab..785a7c1 100644
--- a/payloads/libpayload/Config.in
+++ b/payloads/libpayload/Config.in
@@ -32,15 +32,6 @@ mainmenu "Libpayload Configuration"
menu "Generic Options"
-config GPL
- bool "GPLv2-licensed Options"
- default n
- help
- Prompt for options that will build code licensed under the GNU General
- Public License (version 2). This will subject the whole payload to the
- terms of this license (including its provision to release all sources,
- please see the LICENSE_GPL file for details).
-
config EXPERIMENTAL
bool "Experimental Options"
default n
diff --git a/payloads/libpayload/LICENSES b/payloads/libpayload/LICENSES
index f340ead..621c428 100644
--- a/payloads/libpayload/LICENSES
+++ b/payloads/libpayload/LICENSES
@@ -122,12 +122,7 @@ holders, and the exact license terms that apply.
Original files: src/lib/libc/hash/sha1.c
Current version we use: CVS revision 1.20 2005/08/08
-* arch/arm/mem*.S: GPLv2
- Source: Linux, http://www.kernel.org
- Original files: arch/arm/lib/mem*.S
- Current version we use: 3.9 (418df63adac56841ef6b0f1fcf435bc64d4ed177)
-
-* arch/x86/string.c: LGPLv2.1, modified to GPLv2 under the terms of section 3
- Source: GNU C Library (glibc), http://www.gnu.org/software/libc/libc.html
- Original files: sysdeps/i386/memset.c
- Current version we use: 2.14
+* arch/{arm,x86}/*mem*.S: 2-clause BSD license
+ Source: OpenBSD
+ http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/arch/*
+ Current version we use: stated in the $OpenBSD$ header of each file
diff --git a/payloads/libpayload/arch/arm/Makefile.inc b/payloads/libpayload/arch/arm/Makefile.inc
index 6c8667a..e82c49f 100644
--- a/payloads/libpayload/arch/arm/Makefile.inc
+++ b/payloads/libpayload/arch/arm/Makefile.inc
@@ -39,8 +39,7 @@ libc-y += exception_asm.S exception.c
libc-y += cache.c cpu.S
libc-y += selfboot.c
-# Will fall back to default_memXXX() in libc/memory.c if GPL not allowed.
-libc-$(CONFIG_LP_GPL) += memcpy.S memset.S memmove.S
+libc-y += memcpy.S memset.S memmove.S _memcpy.S
libgdb-y += gdb.c
diff --git a/payloads/libpayload/arch/arm/_memcpy.S b/payloads/libpayload/arch/arm/_memcpy.S
new file mode 100644
index 0000000..3e6acc1
--- /dev/null
+++ b/payloads/libpayload/arch/arm/_memcpy.S
@@ -0,0 +1,462 @@
+/* $OpenBSD: _memcpy.S,v 1.3 2008/06/26 05:42:04 ray Exp $ */
+/* $NetBSD: _memcpy.S,v 1.4 2003/04/05 23:08:52 bjh21 Exp $ */
+
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <arch/asm.h>
+
+/*
+ * This is one fun bit of code ...
+ * Some easy listening music is suggested while trying to understand this
+ * code e.g. Iron Maiden
+ *
+ * For anyone attempting to understand it :
+ *
+ * The core code is implemented here with simple stubs for memcpy()
+ * memmove() and bcopy().
+ *
+ * All local labels are prefixed with Lmemcpy_
+ * Following the prefix a label starting f is used in the forward copy code
+ * while a label using b is used in the backwards copy code
+ * The source and destination addresses determine whether a forward or
+ * backward copy is performed.
+ * Separate bits of code are used to deal with the following situations
+ * for both the forward and backwards copy.
+ * unaligned source address
+ * unaligned destination address
+ * Separate copy routines are used to produce an optimised result for each
+ * of these cases.
+ * The copy code will use LDM/STM instructions to copy up to 32 bytes at
+ * a time where possible.
+ *
+ * Note: r12 (aka ip) can be trashed during the function along with
+ * r0-r3 although r0-r2 have defined uses i.e. src, dest, len through out.
+ * Additional registers are preserved prior to use i.e. r4, r5 & lr
+ *
+ * Apologies for the state of the comments ;-)
+ */
+
+ENTRY(_memcpy)
+ /* Determine copy direction */
+ cmp r1, r0
+ bcc .Lmemcpy_backwards
+
+ moveq r0, #0 /* Quick abort for len=0 */
+ moveq pc, lr
+
+ stmdb sp!, {r0, lr} /* memcpy() returns dest addr */
+ subs r2, r2, #4
+ blt .Lmemcpy_fl4 /* less than 4 bytes */
+ ands r12, r0, #3
+ bne .Lmemcpy_fdestul /* oh unaligned destination addr */
+ ands r12, r1, #3
+ bne .Lmemcpy_fsrcul /* oh unaligned source addr */
+
+.Lmemcpy_ft8:
+ /* We have aligned source and destination */
+ subs r2, r2, #8
+ blt .Lmemcpy_fl12 /* less than 12 bytes (4 from above) */
+ subs r2, r2, #0x14
+ blt .Lmemcpy_fl32 /* less than 32 bytes (12 from above) */
+ stmdb sp!, {r4} /* borrow r4 */
+
+ /* blat 32 bytes at a time */
+ /* XXX for really big copies perhaps we should use more registers */
+.Lmemcpy_floop32:
+ ldmia r1!, {r3, r4, r12, lr}
+ stmia r0!, {r3, r4, r12, lr}
+ ldmia r1!, {r3, r4, r12, lr}
+ stmia r0!, {r3, r4, r12, lr}
+ subs r2, r2, #0x20
+ bge .Lmemcpy_floop32
+
+ cmn r2, #0x10
+ ldmgeia r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
+ stmgeia r0!, {r3, r4, r12, lr}
+ subge r2, r2, #0x10
+ ldmia sp!, {r4} /* return r4 */
+
+.Lmemcpy_fl32:
+ adds r2, r2, #0x14
+
+ /* blat 12 bytes at a time */
+.Lmemcpy_floop12:
+ ldmgeia r1!, {r3, r12, lr}
+ stmgeia r0!, {r3, r12, lr}
+ subges r2, r2, #0x0c
+ bge .Lmemcpy_floop12
+
+.Lmemcpy_fl12:
+ adds r2, r2, #8
+ blt .Lmemcpy_fl4
+
+ subs r2, r2, #4
+ ldrlt r3, [r1], #4
+ strlt r3, [r0], #4
+ ldmgeia r1!, {r3, r12}
+ stmgeia r0!, {r3, r12}
+ subge r2, r2, #4
+
+.Lmemcpy_fl4:
+ /* less than 4 bytes to go */
+ adds r2, r2, #4
+ ldmeqia sp!, {r0, pc} /* done */
+
+ /* copy the crud byte at a time */
+ cmp r2, #2
+ ldrb r3, [r1], #1
+ strb r3, [r0], #1
+ ldrgeb r3, [r1], #1
+ strgeb r3, [r0], #1
+ ldrgtb r3, [r1], #1
+ strgtb r3, [r0], #1
+ ldmia sp!, {r0, pc}
+
+ /* erg - unaligned destination */
+.Lmemcpy_fdestul:
+ rsb r12, r12, #4
+ cmp r12, #2
+
+ /* align destination with byte copies */
+ ldrb r3, [r1], #1
+ strb r3, [r0], #1
+ ldrgeb r3, [r1], #1
+ strgeb r3, [r0], #1
+ ldrgtb r3, [r1], #1
+ strgtb r3, [r0], #1
+ subs r2, r2, r12
+ blt .Lmemcpy_fl4 /* less the 4 bytes */
+
+ ands r12, r1, #3
+ beq .Lmemcpy_ft8 /* we have an aligned source */
+
+ /* erg - unaligned source */
+ /* This is where it gets nasty ... */
+.Lmemcpy_fsrcul:
+ bic r1, r1, #3
+ ldr lr, [r1], #4
+ cmp r12, #2
+ bgt .Lmemcpy_fsrcul3
+ beq .Lmemcpy_fsrcul2
+ cmp r2, #0x0c
+ blt .Lmemcpy_fsrcul1loop4
+ sub r2, r2, #0x0c
+ stmdb sp!, {r4, r5}
+
+.Lmemcpy_fsrcul1loop16:
+ mov r3, lr, lsr #8
+ ldmia r1!, {r4, r5, r12, lr}
+ orr r3, r3, r4, lsl #24
+ mov r4, r4, lsr #8
+ orr r4, r4, r5, lsl #24
+ mov r5, r5, lsr #8
+ orr r5, r5, r12, lsl #24
+ mov r12, r12, lsr #8
+ orr r12, r12, lr, lsl #24
+ stmia r0!, {r3-r5, r12}
+ subs r2, r2, #0x10
+ bge .Lmemcpy_fsrcul1loop16
+ ldmia sp!, {r4, r5}
+ adds r2, r2, #0x0c
+ blt .Lmemcpy_fsrcul1l4
+
+.Lmemcpy_fsrcul1loop4:
+ mov r12, lr, lsr #8
+ ldr lr, [r1], #4
+ orr r12, r12, lr, lsl #24
+ str r12, [r0], #4
+ subs r2, r2, #4
+ bge .Lmemcpy_fsrcul1loop4
+
+.Lmemcpy_fsrcul1l4:
+ sub r1, r1, #3
+ b .Lmemcpy_fl4
+
+.Lmemcpy_fsrcul2:
+ cmp r2, #0x0c
+ blt .Lmemcpy_fsrcul2loop4
+ sub r2, r2, #0x0c
+ stmdb sp!, {r4, r5}
+
+.Lmemcpy_fsrcul2loop16:
+ mov r3, lr, lsr #16
+ ldmia r1!, {r4, r5, r12, lr}
+ orr r3, r3, r4, lsl #16
+ mov r4, r4, lsr #16
+ orr r4, r4, r5, lsl #16
+ mov r5, r5, lsr #16
+ orr r5, r5, r12, lsl #16
+ mov r12, r12, lsr #16
+ orr r12, r12, lr, lsl #16
+ stmia r0!, {r3-r5, r12}
+ subs r2, r2, #0x10
+ bge .Lmemcpy_fsrcul2loop16
+ ldmia sp!, {r4, r5}
+ adds r2, r2, #0x0c
+ blt .Lmemcpy_fsrcul2l4
+
+.Lmemcpy_fsrcul2loop4:
+ mov r12, lr, lsr #16
+ ldr lr, [r1], #4
+ orr r12, r12, lr, lsl #16
+ str r12, [r0], #4
+ subs r2, r2, #4
+ bge .Lmemcpy_fsrcul2loop4
+
+.Lmemcpy_fsrcul2l4:
+ sub r1, r1, #2
+ b .Lmemcpy_fl4
+
+.Lmemcpy_fsrcul3:
+ cmp r2, #0x0c
+ blt .Lmemcpy_fsrcul3loop4
+ sub r2, r2, #0x0c
+ stmdb sp!, {r4, r5}
+
+.Lmemcpy_fsrcul3loop16:
+ mov r3, lr, lsr #24
+ ldmia r1!, {r4, r5, r12, lr}
+ orr r3, r3, r4, lsl #8
+ mov r4, r4, lsr #24
+ orr r4, r4, r5, lsl #8
+ mov r5, r5, lsr #24
+ orr r5, r5, r12, lsl #8
+ mov r12, r12, lsr #24
+ orr r12, r12, lr, lsl #8
+ stmia r0!, {r3-r5, r12}
+ subs r2, r2, #0x10
+ bge .Lmemcpy_fsrcul3loop16
+ ldmia sp!, {r4, r5}
+ adds r2, r2, #0x0c
+ blt .Lmemcpy_fsrcul3l4
+
+.Lmemcpy_fsrcul3loop4:
+ mov r12, lr, lsr #24
+ ldr lr, [r1], #4
+ orr r12, r12, lr, lsl #8
+ str r12, [r0], #4
+ subs r2, r2, #4
+ bge .Lmemcpy_fsrcul3loop4
+
+.Lmemcpy_fsrcul3l4:
+ sub r1, r1, #1
+ b .Lmemcpy_fl4
+
+.Lmemcpy_backwards:
+ add r1, r1, r2
+ add r0, r0, r2
+ subs r2, r2, #4
+ blt .Lmemcpy_bl4 /* less than 4 bytes */
+ ands r12, r0, #3
+ bne .Lmemcpy_bdestul /* oh unaligned destination addr */
+ ands r12, r1, #3
+ bne .Lmemcpy_bsrcul /* oh unaligned source addr */
+
+.Lmemcpy_bt8:
+ /* We have aligned source and destination */
+ subs r2, r2, #8
+ blt .Lmemcpy_bl12 /* less than 12 bytes (4 from above) */
+ stmdb sp!, {r4, lr}
+ subs r2, r2, #0x14 /* less than 32 bytes (12 from above) */
+ blt .Lmemcpy_bl32
+
+ /* blat 32 bytes at a time */
+ /* XXX for really big copies perhaps we should use more registers */
+.Lmemcpy_bloop32:
+ ldmdb r1!, {r3, r4, r12, lr}
+ stmdb r0!, {r3, r4, r12, lr}
+ ldmdb r1!, {r3, r4, r12, lr}
+ stmdb r0!, {r3, r4, r12, lr}
+ subs r2, r2, #0x20
+ bge .Lmemcpy_bloop32
+
+.Lmemcpy_bl32:
+ cmn r2, #0x10
+ ldmgedb r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */
+ stmgedb r0!, {r3, r4, r12, lr}
+ subge r2, r2, #0x10
+ adds r2, r2, #0x14
+ ldmgedb r1!, {r3, r12, lr} /* blat a remaining 12 bytes */
+ stmgedb r0!, {r3, r12, lr}
+ subge r2, r2, #0x0c
+ ldmia sp!, {r4, lr}
+
+.Lmemcpy_bl12:
+ adds r2, r2, #8
+ blt .Lmemcpy_bl4
+ subs r2, r2, #4
+ ldrlt r3, [r1, #-4]!
+ strlt r3, [r0, #-4]!
+ ldmgedb r1!, {r3, r12}
+ stmgedb r0!, {r3, r12}
+ subge r2, r2, #4
+
+.Lmemcpy_bl4:
+ /* less than 4 bytes to go */
+ adds r2, r2, #4
+ moveq pc, lr /* done */
+
+ /* copy the crud byte at a time */
+ cmp r2, #2
+ ldrb r3, [r1, #-1]!
+ strb r3, [r0, #-1]!
+ ldrgeb r3, [r1, #-1]!
+ strgeb r3, [r0, #-1]!
+ ldrgtb r3, [r1, #-1]!
+ strgtb r3, [r0, #-1]!
+ mov pc, lr
+
+ /* erg - unaligned destination */
+.Lmemcpy_bdestul:
+ cmp r12, #2
+
+ /* align destination with byte copies */
+ ldrb r3, [r1, #-1]!
+ strb r3, [r0, #-1]!
+ ldrgeb r3, [r1, #-1]!
+ strgeb r3, [r0, #-1]!
+ ldrgtb r3, [r1, #-1]!
+ strgtb r3, [r0, #-1]!
+ subs r2, r2, r12
+ blt .Lmemcpy_bl4 /* less than 4 bytes to go */
+ ands r12, r1, #3
+ beq .Lmemcpy_bt8 /* we have an aligned source */
+
+ /* erg - unaligned source */
+ /* This is where it gets nasty ... */
+.Lmemcpy_bsrcul:
+ bic r1, r1, #3
+ ldr r3, [r1, #0]
+ cmp r12, #2
+ blt .Lmemcpy_bsrcul1
+ beq .Lmemcpy_bsrcul2
+ cmp r2, #0x0c
+ blt .Lmemcpy_bsrcul3loop4
+ sub r2, r2, #0x0c
+ stmdb sp!, {r4, r5, lr}
+
+.Lmemcpy_bsrcul3loop16:
+ mov lr, r3, lsl #8
+ ldmdb r1!, {r3-r5, r12}
+ orr lr, lr, r12, lsr #24
+ mov r12, r12, lsl #8
+ orr r12, r12, r5, lsr #24
+ mov r5, r5, lsl #8
+ orr r5, r5, r4, lsr #24
+ mov r4, r4, lsl #8
+ orr r4, r4, r3, lsr #24
+ stmdb r0!, {r4, r5, r12, lr}
+ subs r2, r2, #0x10
+ bge .Lmemcpy_bsrcul3loop16
+ ldmia sp!, {r4, r5, lr}
+ adds r2, r2, #0x0c
+ blt .Lmemcpy_bsrcul3l4
+
+.Lmemcpy_bsrcul3loop4:
+ mov r12, r3, lsl #8
+ ldr r3, [r1, #-4]!
+ orr r12, r12, r3, lsr #24
+ str r12, [r0, #-4]!
+ subs r2, r2, #4
+ bge .Lmemcpy_bsrcul3loop4
+
+.Lmemcpy_bsrcul3l4:
+ add r1, r1, #3
+ b .Lmemcpy_bl4
+
+.Lmemcpy_bsrcul2:
+ cmp r2, #0x0c
+ blt .Lmemcpy_bsrcul2loop4
+ sub r2, r2, #0x0c
+ stmdb sp!, {r4, r5, lr}
+
+.Lmemcpy_bsrcul2loop16:
+ mov lr, r3, lsl #16
+ ldmdb r1!, {r3-r5, r12}
+ orr lr, lr, r12, lsr #16
+ mov r12, r12, lsl #16
+ orr r12, r12, r5, lsr #16
+ mov r5, r5, lsl #16
+ orr r5, r5, r4, lsr #16
+ mov r4, r4, lsl #16
+ orr r4, r4, r3, lsr #16
+ stmdb r0!, {r4, r5, r12, lr}
+ subs r2, r2, #0x10
+ bge .Lmemcpy_bsrcul2loop16
+ ldmia sp!, {r4, r5, lr}
+ adds r2, r2, #0x0c
+ blt .Lmemcpy_bsrcul2l4
+
+.Lmemcpy_bsrcul2loop4:
+ mov r12, r3, lsl #16
+ ldr r3, [r1, #-4]!
+ orr r12, r12, r3, lsr #16
+ str r12, [r0, #-4]!
+ subs r2, r2, #4
+ bge .Lmemcpy_bsrcul2loop4
+
+.Lmemcpy_bsrcul2l4:
+ add r1, r1, #2
+ b .Lmemcpy_bl4
+
+.Lmemcpy_bsrcul1:
+ cmp r2, #0x0c
+ blt .Lmemcpy_bsrcul1loop4
+ sub r2, r2, #0x0c
+ stmdb sp!, {r4, r5, lr}
+
+.Lmemcpy_bsrcul1loop32:
+ mov lr, r3, lsl #24
+ ldmdb r1!, {r3-r5, r12}
+ orr lr, lr, r12, lsr #8
+ mov r12, r12, lsl #24
+ orr r12, r12, r5, lsr #8
+ mov r5, r5, lsl #24
+ orr r5, r5, r4, lsr #8
+ mov r4, r4, lsl #24
+ orr r4, r4, r3, lsr #8
+ stmdb r0!, {r4, r5, r12, lr}
+ subs r2, r2, #0x10
+ bge .Lmemcpy_bsrcul1loop32
+ ldmia sp!, {r4, r5, lr}
+ adds r2, r2, #0x0c
+ blt .Lmemcpy_bsrcul1l4
+
+.Lmemcpy_bsrcul1loop4:
+ mov r12, r3, lsl #24
+ ldr r3, [r1, #-4]!
+ orr r12, r12, r3, lsr #8
+ str r12, [r0, #-4]!
+ subs r2, r2, #4
+ bge .Lmemcpy_bsrcul1loop4
+
+.Lmemcpy_bsrcul1l4:
+ add r1, r1, #1
+ b .Lmemcpy_bl4
diff --git a/payloads/libpayload/arch/arm/asmlib.h b/payloads/libpayload/arch/arm/asmlib.h
deleted file mode 100644
index 8b3fa22..0000000
--- a/payloads/libpayload/arch/arm/asmlib.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * arch/arm/asmlib.h
- *
- * Adapted from Linux arch/arm/include/assembler.h
- *
- * Copyright (C) 1996-2000 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This file contains arm architecture specific defines
- * for the different processors.
- *
- * Do not include any C declarations in this file - it is included by
- * assembler source.
- */
-
-/*
- * WARNING: This file is *only* meant for memcpy.S and friends which were copied
- * from Linux and require some weird macros. It does unspeakable things like
- * redefining "push", so do *not* try to turn it into a general assembly macro
- * file, and keep it out of global include directories.
- */
-
-#ifndef __ARM_ASMLIB_H__
-#define __ARM_ASMLIB_H__
-
-/*
- * Endian independent macros for shifting bytes within registers.
- */
-#ifndef __ARMEB__
-#define pull lsr
-#define push lsl
-#define get_byte_0 lsl #0
-#define get_byte_1 lsr #8
-#define get_byte_2 lsr #16
-#define get_byte_3 lsr #24
-#define put_byte_0 lsl #0
-#define put_byte_1 lsl #8
-#define put_byte_2 lsl #16
-#define put_byte_3 lsl #24
-#else
-#define pull lsl
-#define push lsr
-#define get_byte_0 lsr #24
-#define get_byte_1 lsr #16
-#define get_byte_2 lsr #8
-#define get_byte_3 lsl #0
-#define put_byte_0 lsl #24
-#define put_byte_1 lsl #16
-#define put_byte_2 lsl #8
-#define put_byte_3 lsl #0
-#endif
-
-/*
- * Data preload for architectures that support it
- */
-#if 1 /* TODO: differentiate once libpayload supports more ARM versions */
-#define PLD(code...) code
-#else
-#define PLD(code...)
-#endif
-
-/*
- * This can be used to enable code to cacheline align the destination
- * pointer when bulk writing to memory. Linux doesn't enable this except
- * for the "Feroceon" processor, so we better just leave it out.
- */
-#define CALGN(code...)
-
-#endif /* __ARM_ASMLIB_H */
diff --git a/payloads/libpayload/arch/arm/memcpy.S b/payloads/libpayload/arch/arm/memcpy.S
index 1388d05..6d68639 100644
--- a/payloads/libpayload/arch/arm/memcpy.S
+++ b/payloads/libpayload/arch/arm/memcpy.S
@@ -1,237 +1,44 @@
-/*
- * linux/arch/arm/lib/memcpy.S
+/* $OpenBSD: memcpy.S,v 1.4 2014/11/30 19:43:56 deraadt Exp $ */
+/* $NetBSD: memcpy.S,v 1.3 2003/04/05 23:08:52 bjh21 Exp $ */
+
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
*
- * Author: Nicolas Pitre
- * Created: Sep 28, 2005
- * Copyright: MontaVista Software, Inc.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch/asm.h>
-#include "asmlib.h"
-
-#define LDR1W_SHIFT 0
-#define STR1W_SHIFT 0
-
- .macro ldr1w ptr reg abort
- W(ldr) \reg, [\ptr], #4
- .endm
-
- .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
- ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
- .endm
-
- .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
- ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
- .endm
-
- .macro ldr1b ptr reg cond=al abort
- ldr\cond\()b \reg, [\ptr], #1
- .endm
-
- .macro str1w ptr reg abort
- W(str) \reg, [\ptr], #4
- .endm
-
- .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
- stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
- .endm
-
- .macro str1b ptr reg cond=al abort
- str\cond\()b \reg, [\ptr], #1
- .endm
-
- .macro enter reg1 reg2
- stmdb sp!, {r0, \reg1, \reg2}
- .endm
- .macro exit reg1 reg2
- ldmfd sp!, {r0, \reg1, \reg2}
- .endm
-
-/* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
+/*
+ * XXX
+ * the _memcpy function which this calls is actually a _memmove
+ * variant which handles overlaps... That should be fixed.
+ */
ENTRY(memcpy)
-
- enter r4, lr
-
- subs r2, r2, #4
- blt 8f
- ands ip, r0, #3
- PLD( pld [r1, #0] )
- bne 9f
- ands ip, r1, #3
- bne 10f
-
-1: subs r2, r2, #(28)
- stmfd sp!, {r5 - r8}
- blt 5f
-
- CALGN( ands ip, r0, #31 )
- CALGN( rsb r3, ip, #32 )
- CALGN( sbcnes r4, r3, r2 ) @ C is always set here
- CALGN( bcs 2f )
- CALGN( adr r4, 6f )
- CALGN( subs r2, r2, r3 ) @ C gets set
- CALGN( add pc, r4, ip )
-
- PLD( pld [r1, #0] )
-2: PLD( subs r2, r2, #96 )
- PLD( pld [r1, #28] )
- PLD( blt 4f )
- PLD( pld [r1, #60] )
- PLD( pld [r1, #92] )
-
-3: PLD( pld [r1, #124] )
-4: ldr8w r1, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
- subs r2, r2, #32
- str8w r0, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
- bge 3b
- PLD( cmn r2, #96 )
- PLD( bge 4b )
-
-5: ands ip, r2, #28
- rsb ip, ip, #32
-#if LDR1W_SHIFT > 0
- lsl ip, ip, #LDR1W_SHIFT
-#endif
- addne pc, pc, ip @ C is always clear here
- b 7f
-6:
- .rept (1 << LDR1W_SHIFT)
- W(nop)
- .endr
- ldr1w r1, r3, abort=20f
- ldr1w r1, r4, abort=20f
- ldr1w r1, r5, abort=20f
- ldr1w r1, r6, abort=20f
- ldr1w r1, r7, abort=20f
- ldr1w r1, r8, abort=20f
- ldr1w r1, lr, abort=20f
-
-#if LDR1W_SHIFT < STR1W_SHIFT
- lsl ip, ip, #STR1W_SHIFT - LDR1W_SHIFT
-#elif LDR1W_SHIFT > STR1W_SHIFT
- lsr ip, ip, #LDR1W_SHIFT - STR1W_SHIFT
-#endif
- add pc, pc, ip
- nop
- .rept (1 << STR1W_SHIFT)
- W(nop)
- .endr
- str1w r0, r3, abort=20f
- str1w r0, r4, abort=20f
- str1w r0, r5, abort=20f
- str1w r0, r6, abort=20f
- str1w r0, r7, abort=20f
- str1w r0, r8, abort=20f
- str1w r0, lr, abort=20f
-
- CALGN( bcs 2b )
-
-7: ldmfd sp!, {r5 - r8}
-
-8: movs r2, r2, lsl #31
- ldr1b r1, r3, ne, abort=21f
- ldr1b r1, r4, cs, abort=21f
- ldr1b r1, ip, cs, abort=21f
- str1b r0, r3, ne, abort=21f
- str1b r0, r4, cs, abort=21f
- str1b r0, ip, cs, abort=21f
-
- exit r4, pc
-
-9: rsb ip, ip, #4
- cmp ip, #2
- ldr1b r1, r3, gt, abort=21f
- ldr1b r1, r4, ge, abort=21f
- ldr1b r1, lr, abort=21f
- str1b r0, r3, gt, abort=21f
- str1b r0, r4, ge, abort=21f
- subs r2, r2, ip
- str1b r0, lr, abort=21f
- blt 8b
- ands ip, r1, #3
- beq 1b
-
-10: bic r1, r1, #3
- cmp ip, #2
- ldr1w r1, lr, abort=21f
- beq 17f
- bgt 18f
-
-
- .macro forward_copy_shift pull push
-
- subs r2, r2, #28
- blt 14f
-
- CALGN( ands ip, r0, #31 )
- CALGN( rsb ip, ip, #32 )
- CALGN( sbcnes r4, ip, r2 ) @ C is always set here
- CALGN( subcc r2, r2, ip )
- CALGN( bcc 15f )
-
-11: stmfd sp!, {r5 - r9}
-
- PLD( pld [r1, #0] )
- PLD( subs r2, r2, #96 )
- PLD( pld [r1, #28] )
- PLD( blt 13f )
- PLD( pld [r1, #60] )
- PLD( pld [r1, #92] )
-
-12: PLD( pld [r1, #124] )
-13: ldr4w r1, r4, r5, r6, r7, abort=19f
- mov r3, lr, pull #\pull
- subs r2, r2, #32
- ldr4w r1, r8, r9, ip, lr, abort=19f
- orr r3, r3, r4, push #\push
- mov r4, r4, pull #\pull
- orr r4, r4, r5, push #\push
- mov r5, r5, pull #\pull
- orr r5, r5, r6, push #\push
- mov r6, r6, pull #\pull
- orr r6, r6, r7, push #\push
- mov r7, r7, pull #\pull
- orr r7, r7, r8, push #\push
- mov r8, r8, pull #\pull
- orr r8, r8, r9, push #\push
- mov r9, r9, pull #\pull
- orr r9, r9, ip, push #\push
- mov ip, ip, pull #\pull
- orr ip, ip, lr, push #\push
- str8w r0, r3, r4, r5, r6, r7, r8, r9, ip, , abort=19f
- bge 12b
- PLD( cmn r2, #96 )
- PLD( bge 13b )
-
- ldmfd sp!, {r5 - r9}
-
-14: ands ip, r2, #28
- beq 16f
-
-15: mov r3, lr, pull #\pull
- ldr1w r1, lr, abort=21f
- subs ip, ip, #4
- orr r3, r3, lr, push #\push
- str1w r0, r3, abort=21f
- bgt 15b
- CALGN( cmp r2, #0 )
- CALGN( bge 11b )
-
-16: sub r1, r1, #(\push / 8)
- b 8b
-
- .endm
-
-
- forward_copy_shift pull=8 push=24
-
-17: forward_copy_shift pull=16 push=16
-
-18: forward_copy_shift pull=24 push=8
-ENDPROC(memcpy)
+ stmfd sp!, {r0, lr}
+ bl _memcpy
+ ldmfd sp!, {r0, pc}
diff --git a/payloads/libpayload/arch/arm/memmove.S b/payloads/libpayload/arch/arm/memmove.S
index bd5f8f1..f071068 100644
--- a/payloads/libpayload/arch/arm/memmove.S
+++ b/payloads/libpayload/arch/arm/memmove.S
@@ -1,197 +1,38 @@
-/*
- * linux/arch/arm/lib/memmove.S
+/* $OpenBSD: memmove.S,v 1.3 2008/06/26 05:42:04 ray Exp $ */
+/* $NetBSD: memmove.S,v 1.3 2003/04/05 23:08:52 bjh21 Exp $ */
+
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
*
- * Author: Nicolas Pitre
- * Created: Sep 28, 2005
- * Copyright: (C) MontaVista Software Inc.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch/asm.h>
-#include "asmlib.h"
-
-/*
- * Prototype: void *memmove(void *dest, const void *src, size_t n);
- *
- * Note:
- *
- * If the memory regions don't overlap, we simply branch to memcpy which is
- * normally a bit faster. Otherwise the copy is done going downwards. This
- * is a transposition of the code from copy_template.S but with the copy
- * occurring in the opposite direction.
- */
ENTRY(memmove)
-
- subs ip, r0, r1
- cmphi r2, ip
- bls memcpy
-
- stmfd sp!, {r0, r4, lr}
- add r1, r1, r2
- add r0, r0, r2
- subs r2, r2, #4
- blt 8f
- ands ip, r0, #3
- PLD( pld [r1, #-4] )
- bne 9f
- ands ip, r1, #3
- bne 10f
-
-1: subs r2, r2, #(28)
- stmfd sp!, {r5 - r8}
- blt 5f
-
- CALGN( ands ip, r0, #31 )
- CALGN( sbcnes r4, ip, r2 ) @ C is always set here
- CALGN( bcs 2f )
- CALGN( adr r4, 6f )
- CALGN( subs r2, r2, ip ) @ C is set here
- CALGN( rsb ip, ip, #32 )
- CALGN( add pc, r4, ip )
-
- PLD( pld [r1, #-4] )
-2: PLD( subs r2, r2, #96 )
- PLD( pld [r1, #-32] )
- PLD( blt 4f )
- PLD( pld [r1, #-64] )
- PLD( pld [r1, #-96] )
-
-3: PLD( pld [r1, #-128] )
-4: ldmdb r1!, {r3, r4, r5, r6, r7, r8, ip, lr}
- subs r2, r2, #32
- stmdb r0!, {r3, r4, r5, r6, r7, r8, ip, lr}
- bge 3b
- PLD( cmn r2, #96 )
- PLD( bge 4b )
-
-5: ands ip, r2, #28
- rsb ip, ip, #32
- addne pc, pc, ip @ C is always clear here
- b 7f
-6: W(nop)
- W(ldr) r3, [r1, #-4]!
- W(ldr) r4, [r1, #-4]!
- W(ldr) r5, [r1, #-4]!
- W(ldr) r6, [r1, #-4]!
- W(ldr) r7, [r1, #-4]!
- W(ldr) r8, [r1, #-4]!
- W(ldr) lr, [r1, #-4]!
-
- add pc, pc, ip
- nop
- W(nop)
- W(str) r3, [r0, #-4]!
- W(str) r4, [r0, #-4]!
- W(str) r5, [r0, #-4]!
- W(str) r6, [r0, #-4]!
- W(str) r7, [r0, #-4]!
- W(str) r8, [r0, #-4]!
- W(str) lr, [r0, #-4]!
-
- CALGN( bcs 2b )
-
-7: ldmfd sp!, {r5 - r8}
-
-8: movs r2, r2, lsl #31
- ldrneb r3, [r1, #-1]!
- ldrcsb r4, [r1, #-1]!
- ldrcsb ip, [r1, #-1]
- strneb r3, [r0, #-1]!
- strcsb r4, [r0, #-1]!
- strcsb ip, [r0, #-1]
- ldmfd sp!, {r0, r4, pc}
-
-9: cmp ip, #2
- ldrgtb r3, [r1, #-1]!
- ldrgeb r4, [r1, #-1]!
- ldrb lr, [r1, #-1]!
- strgtb r3, [r0, #-1]!
- strgeb r4, [r0, #-1]!
- subs r2, r2, ip
- strb lr, [r0, #-1]!
- blt 8b
- ands ip, r1, #3
- beq 1b
-
-10: bic r1, r1, #3
- cmp ip, #2
- ldr r3, [r1, #0]
- beq 17f
- blt 18f
-
-
- .macro backward_copy_shift push pull
-
- subs r2, r2, #28
- blt 14f
-
- CALGN( ands ip, r0, #31 )
- CALGN( sbcnes r4, ip, r2 ) @ C is always set here
- CALGN( subcc r2, r2, ip )
- CALGN( bcc 15f )
-
-11: stmfd sp!, {r5 - r9}
-
- PLD( pld [r1, #-4] )
- PLD( subs r2, r2, #96 )
- PLD( pld [r1, #-32] )
- PLD( blt 13f )
- PLD( pld [r1, #-64] )
- PLD( pld [r1, #-96] )
-
-12: PLD( pld [r1, #-128] )
-13: ldmdb r1!, {r7, r8, r9, ip}
- mov lr, r3, push #\push
- subs r2, r2, #32
- ldmdb r1!, {r3, r4, r5, r6}
- orr lr, lr, ip, pull #\pull
- mov ip, ip, push #\push
- orr ip, ip, r9, pull #\pull
- mov r9, r9, push #\push
- orr r9, r9, r8, pull #\pull
- mov r8, r8, push #\push
- orr r8, r8, r7, pull #\pull
- mov r7, r7, push #\push
- orr r7, r7, r6, pull #\pull
- mov r6, r6, push #\push
- orr r6, r6, r5, pull #\pull
- mov r5, r5, push #\push
- orr r5, r5, r4, pull #\pull
- mov r4, r4, push #\push
- orr r4, r4, r3, pull #\pull
- stmdb r0!, {r4 - r9, ip, lr}
- bge 12b
- PLD( cmn r2, #96 )
- PLD( bge 13b )
-
- ldmfd sp!, {r5 - r9}
-
-14: ands ip, r2, #28
- beq 16f
-
-15: mov lr, r3, push #\push
- ldr r3, [r1, #-4]!
- subs ip, ip, #4
- orr lr, lr, r3, pull #\pull
- str lr, [r0, #-4]!
- bgt 15b
- CALGN( cmp r2, #0 )
- CALGN( bge 11b )
-
-16: add r1, r1, #(\pull / 8)
- b 8b
-
- .endm
-
-
- backward_copy_shift push=8 pull=24
-
-17: backward_copy_shift push=16 pull=16
-
-18: backward_copy_shift push=24 pull=8
-
-ENDPROC(memmove)
+ stmfd sp!, {r0, lr}
+ bl _memcpy
+ ldmfd sp!, {r0, pc}
diff --git a/payloads/libpayload/arch/arm/memset.S b/payloads/libpayload/arch/arm/memset.S
index 0c1102d..b0a2bc9 100644
--- a/payloads/libpayload/arch/arm/memset.S
+++ b/payloads/libpayload/arch/arm/memset.S
@@ -1,121 +1,127 @@
+/* $OpenBSD: memset.S,v 1.2 2004/02/01 05:40:52 drahn Exp $ */
+/* $NetBSD: memset.S,v 1.3 2003/04/05 23:08:52 bjh21 Exp $ */
+
/*
- * linux/arch/arm/lib/memset.S
- *
- * Copyright (C) 1995-2000 Russell King
+ * Copyright (c) 1995 Mark Brinicombe.
+ * All rights reserved.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Mark Brinicombe.
+ * 4. The name of the company nor the name of the author may be used to
+ * endorse or promote products derived from this software without specific
+ * prior written permission.
*
- * ASM optimised string functions
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
*/
#include <arch/asm.h>
-#include "asmlib.h"
-ENTRY(memset)
- ands r3, r0, #3 @ 1 unaligned?
- mov ip, r0 @ preserve r0 as return value
- bne 6f @ 1
/*
- * we know that the pointer in ip is aligned to a word boundary.
+ * Sets a block of memory to the specified value
+ *
+ * On entry:
+ * r0 - dest address
+ * r1 - byte to write
+ * r2 - number of bytes to write
+ *
+ * On exit:
+ * r0 - dest address
*/
-1: orr r1, r1, r1, lsl #8
- orr r1, r1, r1, lsl #16
- mov r3, r1
- cmp r2, #16
- blt 4f
-#if ! CALGN(1)+0
+ENTRY(memset)
+ stmfd sp!, {r0} /* Remember address for return value */
+ and r1, r1, #0x000000ff /* We write bytes */
-/*
- * We need 2 extra registers for this loop - use r8 and the LR
- */
- stmfd sp!, {r8, lr}
- mov r8, r1
- mov lr, r1
-
-2: subs r2, r2, #64
- stmgeia ip!, {r1, r3, r8, lr} @ 64 bytes at a time.
- stmgeia ip!, {r1, r3, r8, lr}
- stmgeia ip!, {r1, r3, r8, lr}
- stmgeia ip!, {r1, r3, r8, lr}
- bgt 2b
- ldmeqfd sp!, {r8, pc} @ Now <64 bytes to go.
-/*
- * No need to correct the count; we're only testing bits from now on
- */
- tst r2, #32
- stmneia ip!, {r1, r3, r8, lr}
- stmneia ip!, {r1, r3, r8, lr}
- tst r2, #16
- stmneia ip!, {r1, r3, r8, lr}
- ldmfd sp!, {r8, lr}
+ cmp r2, #0x00000004 /* Do we have less than 4 bytes */
+ blt .Lmemset_lessthanfour
-#else
+ /* Ok first we will word align the address */
-/*
- * This version aligns the destination pointer in order to write
- * whole cache lines at once.
- */
+ ands r3, r0, #0x00000003 /* Get the bottom two bits */
+ beq .Lmemset_addraligned /* The address is word aligned */
- stmfd sp!, {r4-r8, lr}
- mov r4, r1
- mov r5, r1
- mov r6, r1
- mov r7, r1
- mov r8, r1
- mov lr, r1
-
- cmp r2, #96
- tstgt ip, #31
- ble 3f
-
- and r8, ip, #31
- rsb r8, r8, #32
- sub r2, r2, r8
- movs r8, r8, lsl #(32 - 4)
- stmcsia ip!, {r4, r5, r6, r7}
- stmmiia ip!, {r4, r5}
- tst r8, #(1 << 30)
- mov r8, r1
- strne r1, [ip], #4
-
-3: subs r2, r2, #64
- stmgeia ip!, {r1, r3-r8, lr}
- stmgeia ip!, {r1, r3-r8, lr}
- bgt 3b
- ldmeqfd sp!, {r4-r8, pc}
-
- tst r2, #32
- stmneia ip!, {r1, r3-r8, lr}
- tst r2, #16
- stmneia ip!, {r4-r7}
- ldmfd sp!, {r4-r8, lr}
-
-#endif
-
-4: tst r2, #8
- stmneia ip!, {r1, r3}
- tst r2, #4
- strne r1, [ip], #4
-/*
- * When we get here, we've got less than 4 bytes to zero. We
- * may have an unaligned pointer as well.
- */
-5: tst r2, #2
- strneb r1, [ip], #1
- strneb r1, [ip], #1
- tst r2, #1
- strneb r1, [ip], #1
- mov pc, lr
-
-6: subs r2, r2, #4 @ 1 do we have enough
- blt 5b @ 1 bytes to align with?
- cmp r3, #2 @ 1
- strltb r1, [ip], #1 @ 1
- strleb r1, [ip], #1 @ 1
- strb r1, [ip], #1 @ 1
- add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3))
- b 1b
-ENDPROC(memset)
+ rsb r3, r3, #0x00000004
+ sub r2, r2, r3
+ cmp r3, #0x00000002
+ strb r1, [r0], #0x0001 /* Set 1 byte */
+ strgeb r1, [r0], #0x0001 /* Set another byte */
+ strgtb r1, [r0], #0x0001 /* and a third */
+
+ cmp r2, #0x00000004
+ blt .Lmemset_lessthanfour
+
+ /* Now we must be word aligned */
+
+.Lmemset_addraligned:
+
+ orr r3, r1, r1, lsl #8 /* Repeat the byte into a word */
+ orr r3, r3, r3, lsl #16
+
+ /* We know we have at least 4 bytes ... */
+
+ cmp r2, #0x00000020 /* If less than 32 then use words */
+ blt .Lmemset_lessthan32
+
+ /* We have at least 32 so lets use quad words */
+
+ stmfd sp!, {r4-r6} /* Store registers */
+ mov r4, r3 /* Duplicate data */
+ mov r5, r3
+ mov r6, r3
+
+.Lmemset_loop16:
+ stmia r0!, {r3-r6} /* Store 16 bytes */
+ sub r2, r2, #0x00000010 /* Adjust count */
+ cmp r2, #0x00000010 /* Still got at least 16 bytes ? */
+ bgt .Lmemset_loop16
+
+ ldmfd sp!, {r4-r6} /* Restore registers */
+
+ /* Do we need to set some words as well ? */
+
+ cmp r2, #0x00000004
+ blt .Lmemset_lessthanfour
+
+ /* Have either less than 16 or less than 32 depending on route taken */
+
+.Lmemset_lessthan32:
+
+ /* We have at least 4 bytes so copy as words */
+
+.Lmemset_loop4:
+ str r3, [r0], #0x0004
+ sub r2, r2, #0x0004
+ cmp r2, #0x00000004
+ bge .Lmemset_loop4
+
+.Lmemset_lessthanfour:
+ cmp r2, #0x00000000
+ ldmeqfd sp!, {r0}
+ moveq pc, lr /* Zero length so exit */
+
+ cmp r2, #0x00000002
+ strb r1, [r0], #0x0001 /* Set 1 byte */
+ strgeb r1, [r0], #0x0001 /* Set another byte */
+ strgtb r1, [r0], #0x0001 /* and a third */
+
+ ldmfd sp!, {r0}
+ mov pc, lr /* Exit */
diff --git a/payloads/libpayload/arch/x86/Makefile.inc b/payloads/libpayload/arch/x86/Makefile.inc
index 87b3e9e..19784f5 100644
--- a/payloads/libpayload/arch/x86/Makefile.inc
+++ b/payloads/libpayload/arch/x86/Makefile.inc
@@ -34,8 +34,9 @@ libc-y += exec.S virtual.c
libc-y += selfboot.c
libc-y += exception_asm.S exception.c
-# Will fall back to default_memXXX() in libc/memory.c if GPL not allowed.
-libc-$(CONFIG_LP_GPL) += string.c
+libc-y += memset.S
+# also contains memcpy
+libc-y += memmove.S
libgdb-y += gdb.c
diff --git a/payloads/libpayload/arch/x86/memmove.S b/payloads/libpayload/arch/x86/memmove.S
new file mode 100644
index 0000000..3e9e57f
--- /dev/null
+++ b/payloads/libpayload/arch/x86/memmove.S
@@ -0,0 +1,106 @@
+/* $OpenBSD: memmove.S,v 1.5 2014/12/02 03:07:13 tedu Exp $ */
+
+/*-
+ * Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved.
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Emulate bcopy() by swapping the first two arguments, and jumping
+ * into memmove(), which handles overlapping regions.
+ */
+//ENTRY(bcopy)
+ pushl %esi
+ pushl %edi
+ movl 12(%esp),%esi
+ movl 16(%esp),%edi
+ jmp docopy
+
+/*
+ * memmove(caddr_t dst, caddr_t src, size_t len);
+ * Copy len bytes, coping with overlapping space.
+ */
+ .globl memmove
+memmove:
+ pushl %esi
+ pushl %edi
+ movl 12(%esp),%edi
+ movl 16(%esp),%esi
+docopy:
+ movl 20(%esp),%ecx
+ movl %edi,%eax
+ subl %esi,%eax
+ cmpl %ecx,%eax # overlapping?
+ jb 1f
+ jmp docopyf # nope
+/*
+ * memcpy() doesn't worry about overlap and always copies forward
+ */
+ .globl memcpy
+memcpy:
+ pushl %esi
+ pushl %edi
+ movl 12(%esp),%edi
+ movl 16(%esp),%esi
+ movl 20(%esp),%ecx
+docopyf:
+ movl %edi,%eax # setup return value for memcpy/memmove
+ shrl $2,%ecx # copy by 32-bit words
+ rep
+ movsl
+ movl 20(%esp),%ecx
+ andl $3,%ecx # any bytes left?
+ rep
+ movsb
+ popl %edi
+ popl %esi
+ ret
+
+1: movl %edi,%eax # setup return value for memmove
+ addl %ecx,%edi # copy backward
+ addl %ecx,%esi
+ std
+ andl $3,%ecx # any fractional bytes?
+ decl %edi
+ decl %esi
+ rep
+ movsb
+ movl 20(%esp),%ecx # copy remainder by 32-bit words
+ shrl $2,%ecx
+ subl $3,%esi
+ subl $3,%edi
+ rep
+ movsl
+ popl %edi
+ popl %esi
+ cld
+ ret
+
diff --git a/payloads/libpayload/arch/x86/memset.S b/payloads/libpayload/arch/x86/memset.S
new file mode 100644
index 0000000..1a8cbd9
--- /dev/null
+++ b/payloads/libpayload/arch/x86/memset.S
@@ -0,0 +1,54 @@
+/* $OpenBSD: memset.S,v 1.4 2007/05/25 20:32:29 krw Exp $ */
+/*
+ * Written by J.T. Conklin <jtc at netbsd.org>.
+ * Public domain.
+ */
+
+ .globl memset
+memset:
+ pushl %edi
+ pushl %ebx
+ movl 12(%esp),%edi
+ movzbl 16(%esp),%eax /* unsigned char, zero extend */
+ movl 20(%esp),%ecx
+ pushl %edi /* push address of buffer */
+
+ cld /* set fill direction forward */
+
+ /*
+ * if the string is too short, it's really not worth the overhead
+ * of aligning to word boundaries, etc. So we jump to a plain
+ * unaligned set.
+ */
+ cmpl $0x0f,%ecx
+ jle L1
+
+ movb %al,%ah /* copy char to all bytes in word */
+ movl %eax,%edx
+ sall $16,%eax
+ orl %edx,%eax
+
+ movl %edi,%edx /* compute misalignment */
+ negl %edx
+ andl $3,%edx
+ movl %ecx,%ebx
+ subl %edx,%ebx
+
+ movl %edx,%ecx /* set until word aligned */
+ rep
+ stosb
+
+ movl %ebx,%ecx
+ shrl $2,%ecx /* set by words */
+ rep
+ stosl
+
+ movl %ebx,%ecx /* set remainder by bytes */
+ andl $3,%ecx
+L1: rep
+ stosb
+
+ popl %eax /* pop address of buffer */
+ popl %ebx
+ popl %edi
+ ret
diff --git a/payloads/libpayload/arch/x86/string.c b/payloads/libpayload/arch/x86/string.c
deleted file mode 100644
index 60de812..0000000
--- a/payloads/libpayload/arch/x86/string.c
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
- * Copyright (C) 1991,1992,1993,1997,1998,2003, 2005 Free Software Foundation, Inc.
- * This file is part of the GNU C Library.
- * Copyright (c) 2011 The Chromium OS Authors.
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc.
- */
-
-/* From glibc-2.14, sysdeps/i386/memset.c */
-
-#include <stdint.h>
-
-#include "string.h"
-
-typedef uint32_t op_t;
-
-void *memset(void *dstpp, int c, size_t len)
-{
- int d0;
- unsigned long int dstp = (unsigned long int) dstpp;
-
- /* This explicit register allocation improves code very much indeed. */
- register op_t x asm("ax");
-
- x = (unsigned char) c;
-
- /* Clear the direction flag, so filling will move forward. */
- asm volatile("cld");
-
- /* This threshold value is optimal. */
- if (len >= 12) {
- /* Fill X with four copies of the char we want to fill with. */
- x |= (x << 8);
- x |= (x << 16);
-
- /* Adjust LEN for the bytes handled in the first loop. */
- len -= (-dstp) % sizeof(op_t);
-
- /*
- * There are at least some bytes to set. No need to test for
- * LEN == 0 in this alignment loop.
- */
-
- /* Fill bytes until DSTP is aligned on a longword boundary. */
- asm volatile(
- "rep\n"
- "stosb" /* %0, %2, %3 */ :
- "=D" (dstp), "=c" (d0) :
- "0" (dstp), "1" ((-dstp) % sizeof(op_t)), "a" (x) :
- "memory");
-
- /* Fill longwords. */
- asm volatile(
- "rep\n"
- "stosl" /* %0, %2, %3 */ :
- "=D" (dstp), "=c" (d0) :
- "0" (dstp), "1" (len / sizeof(op_t)), "a" (x) :
- "memory");
- len %= sizeof(op_t);
- }
-
- /* Write the last few bytes. */
- asm volatile(
- "rep\n"
- "stosb" /* %0, %2, %3 */ :
- "=D" (dstp), "=c" (d0) :
- "0" (dstp), "1" (len), "a" (x) :
- "memory");
-
- return dstpp;
-}
-
-void *memcpy(void *dest, const void *src, size_t n)
-{
- unsigned long d0, d1, d2;
-
- asm volatile(
- "rep ; movsl\n\t"
- "movl %4,%%ecx\n\t"
- "rep ; movsb\n\t"
- : "=&c" (d0), "=&D" (d1), "=&S" (d2)
- : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
- : "memory"
- );
-
- return dest;
-}
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