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Hexagon: add target builtins to kernel 

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

Signed-off-by: Sid Manning <sidneym@codeaurora.org>
Add SYM_FUNC_START/END, ksyms exports
Signed-off-by: Brian Cain <bcain@codeaurora.org>

Tested-by: Nick Desaulniers <ndesaulniers@google.com>
This commit is contained in:
Sid Manning 2020-10-13 16:17:50 -05:00 committed by Brian Cain
parent aaa44952bb
commit f1f99adf05
8 changed files with 249 additions and 8 deletions
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3
arch/hexagon/Makefile
View File

@ -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/ \

8
arch/hexagon/kernel/hexagon_ksyms.c
View File

@ -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);

3
arch/hexagon/lib/Makefile
View File

@ -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

67
arch/hexagon/lib/divsi3.S Normal file
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@ -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)

56
arch/hexagon/lib/memcpy_likely_aligned.S Normal file
View File

@ -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)

46
arch/hexagon/lib/modsi3.S Normal file
View File

@ -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)

38
arch/hexagon/lib/udivsi3.S Normal file
View File

@ -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)

36
arch/hexagon/lib/umodsi3.S Normal file
View File

@ -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)