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authorGabe Black <gabeblack@google.com>2013-07-07 14:15:22 -0700
committerRonald G. Minnich <rminnich@gmail.com>2013-07-14 20:36:00 +0200
commit7a6651ceb3ede6b35053ad65358d6994facc217e (patch)
treef71c0fafe2982f4b3523133e1c08e7820997d0da /src/arch/armv7
parentccdc005b015f4211d0fa0d45393c5e4104620c53 (diff)
arm: Add and enable an arch specific version of memmove.
This version is taken from arch/arm/lib/memmove.S in the Linux kernel. Change-Id: Ic875d0cf5b1cb407606530b7f465c406b134f0fa Signed-off-by: Gabe Black <gabeblack@chromium.org> Reviewed-on: http://review.coreboot.org/3763 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/arch/armv7')
-rw-r--r--src/arch/armv7/Kconfig1
-rw-r--r--src/arch/armv7/Makefile.inc3
-rw-r--r--src/arch/armv7/memmove.S197
3 files changed, 201 insertions, 0 deletions
diff --git a/src/arch/armv7/Kconfig b/src/arch/armv7/Kconfig
index 130acb44e7..4f9fc344c7 100644
--- a/src/arch/armv7/Kconfig
+++ b/src/arch/armv7/Kconfig
@@ -6,6 +6,7 @@ config ARM_ARCH_OPTIONS
default y
select HAVE_ARCH_MEMSET
select HAVE_ARCH_MEMCPY
+ select HAVE_ARCH_MEMMOVE
# Maximum reboot count
# TODO: Improve description.
diff --git a/src/arch/armv7/Makefile.inc b/src/arch/armv7/Makefile.inc
index 31410e3d54..dafe98ca81 100644
--- a/src/arch/armv7/Makefile.inc
+++ b/src/arch/armv7/Makefile.inc
@@ -188,6 +188,9 @@ bootblock-y += memset.S
romstage-y += memcpy.S
ramstage-y += memcpy.S
bootblock-y += memcpy.S
+romstage-y += memmove.S
+ramstage-y += memmove.S
+bootblock-y += memmove.S
$(obj)/arch/armv7/coreboot_table.ramstage.o : $(OPTION_TABLE_H)
diff --git a/src/arch/armv7/memmove.S b/src/arch/armv7/memmove.S
new file mode 100644
index 0000000000..a2f9ea18ae
--- /dev/null
+++ b/src/arch/armv7/memmove.S
@@ -0,0 +1,197 @@
+/*
+ * linux/arch/arm/lib/memmove.S
+ *
+ * Author: Nicolas Pitre
+ * Created: Sep 28, 2005
+ * Copyright: (C) MontaVista Software Inc.
+ *
+ * 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.
+ */
+
+#include <assembler.h>
+
+ .text
+
+/*
+ * 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.
+ */
+
+.type memmove, function
+.globl memmove
+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