[PATCH 5.10 4/6] Hexagon: add target builtins to kernel

From: Greg Kroah-Hartman
Date: Fri Jul 09 2021 - 09:22:43 EST

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From: Sid Manning <sidneym@xxxxxxxxxxxxxx>

commit f1f99adf05f2138ff2646d756d4674e302e8d02d upstream.

Add the compiler-rt builtins like memcpy to the hexagon kernel.

Signed-off-by: Sid Manning <sidneym@xxxxxxxxxxxxxx>
Add SYM_FUNC_START/END, ksyms exports
Signed-off-by: Brian Cain <bcain@xxxxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Tested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/hexagon/Makefile | 3 -
arch/hexagon/kernel/hexagon_ksyms.c | 8 +--
arch/hexagon/lib/Makefile | 3 -
arch/hexagon/lib/divsi3.S | 67 +++++++++++++++++++++++++++++++
arch/hexagon/lib/memcpy_likely_aligned.S | 56 +++++++++++++++++++++++++
arch/hexagon/lib/modsi3.S | 46 +++++++++++++++++++++
arch/hexagon/lib/udivsi3.S | 38 +++++++++++++++++
arch/hexagon/lib/umodsi3.S | 36 ++++++++++++++++
8 files changed, 249 insertions(+), 8 deletions(-)

--- a/arch/hexagon/Makefile
+++ b/arch/hexagon/Makefile
@@ -33,9 +33,6 @@ TIR_NAME := r19
KBUILD_CFLAGS += -ffixed-$(TIR_NAME) -DTHREADINFO_REG=$(TIR_NAME) -D__linux__
KBUILD_AFLAGS += -DTHREADINFO_REG=$(TIR_NAME)

-LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name 2>/dev/null)
-libs-y += $(LIBGCC)
-
head-y := arch/hexagon/kernel/head.o

core-y += arch/hexagon/kernel/ \
--- a/arch/hexagon/kernel/hexagon_ksyms.c
+++ b/arch/hexagon/kernel/hexagon_ksyms.c
@@ -35,8 +35,8 @@ EXPORT_SYMBOL(_dflt_cache_att);
DECLARE_EXPORT(__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes);

/* Additional functions */
-DECLARE_EXPORT(__divsi3);
-DECLARE_EXPORT(__modsi3);
-DECLARE_EXPORT(__udivsi3);
-DECLARE_EXPORT(__umodsi3);
+DECLARE_EXPORT(__hexagon_divsi3);
+DECLARE_EXPORT(__hexagon_modsi3);
+DECLARE_EXPORT(__hexagon_udivsi3);
+DECLARE_EXPORT(__hexagon_umodsi3);
DECLARE_EXPORT(csum_tcpudp_magic);
--- a/arch/hexagon/lib/Makefile
+++ b/arch/hexagon/lib/Makefile
@@ -2,4 +2,5 @@
#
# Makefile for hexagon-specific library files.
#
-obj-y = checksum.o io.o memcpy.o memset.o
+obj-y = checksum.o io.o memcpy.o memset.o memcpy_likely_aligned.o \
+ divsi3.o modsi3.o udivsi3.o umodsi3.o
--- /dev/null
+++ b/arch/hexagon/lib/divsi3.S
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/linkage.h>
+
+SYM_FUNC_START(__hexagon_divsi3)
+ {
+ p0 = cmp.gt(r0,#-1)
+ p1 = cmp.gt(r1,#-1)
+ r3:2 = vabsw(r1:0)
+ }
+ {
+ p3 = xor(p0,p1)
+ r4 = sub(r2,r3)
+ r6 = cl0(r2)
+ p0 = cmp.gtu(r3,r2)
+ }
+ {
+ r0 = mux(p3,#-1,#1)
+ r7 = cl0(r3)
+ p1 = cmp.gtu(r3,r4)
+ }
+ {
+ r0 = mux(p0,#0,r0)
+ p0 = or(p0,p1)
+ if (p0.new) jumpr:nt r31
+ r6 = sub(r7,r6)
+ }
+ {
+ r7 = r6
+ r5:4 = combine(#1,r3)
+ r6 = add(#1,lsr(r6,#1))
+ p0 = cmp.gtu(r6,#4)
+ }
+ {
+ r5:4 = vaslw(r5:4,r7)
+ if (!p0) r6 = #3
+ }
+ {
+ loop0(1f,r6)
+ r7:6 = vlsrw(r5:4,#1)
+ r1:0 = #0
+ }
+ .falign
+1:
+ {
+ r5:4 = vlsrw(r5:4,#2)
+ if (!p0.new) r0 = add(r0,r5)
+ if (!p0.new) r2 = sub(r2,r4)
+ p0 = cmp.gtu(r4,r2)
+ }
+ {
+ r7:6 = vlsrw(r7:6,#2)
+ if (!p0.new) r0 = add(r0,r7)
+ if (!p0.new) r2 = sub(r2,r6)
+ p0 = cmp.gtu(r6,r2)
+ }:endloop0
+ {
+ if (!p0) r0 = add(r0,r7)
+ }
+ {
+ if (p3) r0 = sub(r1,r0)
+ jumpr r31
+ }
+SYM_FUNC_END(__hexagon_divsi3)
--- /dev/null
+++ b/arch/hexagon/lib/memcpy_likely_aligned.S
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/linkage.h>
+
+SYM_FUNC_START(__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes)
+ {
+ p0 = bitsclr(r1,#7)
+ p0 = bitsclr(r0,#7)
+ if (p0.new) r5:4 = memd(r1)
+ if (p0.new) r7:6 = memd(r1+#8)
+ }
+ {
+ if (!p0) jump:nt .Lmemcpy_call
+ if (p0) r9:8 = memd(r1+#16)
+ if (p0) r11:10 = memd(r1+#24)
+ p0 = cmp.gtu(r2,#64)
+ }
+ {
+ if (p0) jump:nt .Lmemcpy_call
+ if (!p0) memd(r0) = r5:4
+ if (!p0) memd(r0+#8) = r7:6
+ p0 = cmp.gtu(r2,#32)
+ }
+ {
+ p1 = cmp.gtu(r2,#40)
+ p2 = cmp.gtu(r2,#48)
+ if (p0) r13:12 = memd(r1+#32)
+ if (p1.new) r15:14 = memd(r1+#40)
+ }
+ {
+ memd(r0+#16) = r9:8
+ memd(r0+#24) = r11:10
+ }
+ {
+ if (p0) memd(r0+#32) = r13:12
+ if (p1) memd(r0+#40) = r15:14
+ if (!p2) jumpr:t r31
+ }
+ {
+ p0 = cmp.gtu(r2,#56)
+ r5:4 = memd(r1+#48)
+ if (p0.new) r7:6 = memd(r1+#56)
+ }
+ {
+ memd(r0+#48) = r5:4
+ if (p0) memd(r0+#56) = r7:6
+ jumpr r31
+ }
+
+.Lmemcpy_call:
+ jump memcpy
+
+SYM_FUNC_END(__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes)
--- /dev/null
+++ b/arch/hexagon/lib/modsi3.S
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/linkage.h>
+
+SYM_FUNC_START(__hexagon_modsi3)
+ {
+ p2 = cmp.ge(r0,#0)
+ r2 = abs(r0)
+ r1 = abs(r1)
+ }
+ {
+ r3 = cl0(r2)
+ r4 = cl0(r1)
+ p0 = cmp.gtu(r1,r2)
+ }
+ {
+ r3 = sub(r4,r3)
+ if (p0) jumpr r31
+ }
+ {
+ p1 = cmp.eq(r3,#0)
+ loop0(1f,r3)
+ r0 = r2
+ r2 = lsl(r1,r3)
+ }
+ .falign
+1:
+ {
+ p0 = cmp.gtu(r2,r0)
+ if (!p0.new) r0 = sub(r0,r2)
+ r2 = lsr(r2,#1)
+ if (p1) r1 = #0
+ }:endloop0
+ {
+ p0 = cmp.gtu(r2,r0)
+ if (!p0.new) r0 = sub(r0,r1)
+ if (p2) jumpr r31
+ }
+ {
+ r0 = neg(r0)
+ jumpr r31
+ }
+SYM_FUNC_END(__hexagon_modsi3)
--- /dev/null
+++ b/arch/hexagon/lib/udivsi3.S
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/linkage.h>
+
+SYM_FUNC_START(__hexagon_udivsi3)
+ {
+ r2 = cl0(r0)
+ r3 = cl0(r1)
+ r5:4 = combine(#1,#0)
+ p0 = cmp.gtu(r1,r0)
+ }
+ {
+ r6 = sub(r3,r2)
+ r4 = r1
+ r1:0 = combine(r0,r4)
+ if (p0) jumpr r31
+ }
+ {
+ r3:2 = vlslw(r5:4,r6)
+ loop0(1f,r6)
+ }
+ .falign
+1:
+ {
+ p0 = cmp.gtu(r2,r1)
+ if (!p0.new) r1 = sub(r1,r2)
+ if (!p0.new) r0 = add(r0,r3)
+ r3:2 = vlsrw(r3:2,#1)
+ }:endloop0
+ {
+ p0 = cmp.gtu(r2,r1)
+ if (!p0.new) r0 = add(r0,r3)
+ jumpr r31
+ }
+SYM_FUNC_END(__hexagon_udivsi3)
--- /dev/null
+++ b/arch/hexagon/lib/umodsi3.S
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/linkage.h>
+
+SYM_FUNC_START(__hexagon_umodsi3)
+ {
+ r2 = cl0(r0)
+ r3 = cl0(r1)
+ p0 = cmp.gtu(r1,r0)
+ }
+ {
+ r2 = sub(r3,r2)
+ if (p0) jumpr r31
+ }
+ {
+ loop0(1f,r2)
+ p1 = cmp.eq(r2,#0)
+ r2 = lsl(r1,r2)
+ }
+ .falign
+1:
+ {
+ p0 = cmp.gtu(r2,r0)
+ if (!p0.new) r0 = sub(r0,r2)
+ r2 = lsr(r2,#1)
+ if (p1) r1 = #0
+ }:endloop0
+ {
+ p0 = cmp.gtu(r2,r0)
+ if (!p0.new) r0 = sub(r0,r1)
+ jumpr r31
+ }
+SYM_FUNC_END(__hexagon_umodsi3)

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