* [PATCH 0/3] tools/nolibc: hexagon support
@ 2026-08-19 6:31 Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 1/3] tools/nolibc: split the architecture list into multiple lines Thomas Weißschuh
` (3 more replies)
0 siblings, 4 replies; 6+ messages in thread
From: Thomas Weißschuh @ 2026-08-19 6:31 UTC (permalink / raw)
To: Brian Cain, Willy Tarreau, Shuah Khan
Cc: linux-hexagon, linux-kernel, linux-kselftest,
Thomas Weißschuh
Add support for the hexagon architecture.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
Thomas Weißschuh (3):
tools/nolibc: split the architecture list into multiple lines
selftests/nolibc: prepare for clang-only architectures
tools/nolibc: add support for hexagon
tools/include/nolibc/Makefile | 18 ++-
tools/include/nolibc/arch-hexagon.h | 164 +++++++++++++++++++++++++
tools/include/nolibc/arch.h | 2 +
tools/testing/selftests/nolibc/Makefile.nolibc | 8 ++
tools/testing/selftests/nolibc/run-tests.sh | 20 ++-
5 files changed, 209 insertions(+), 3 deletions(-)
---
base-commit: b58afc8d1cf85688601b8d7e271125fff666f661
change-id: 20260511-nolibc-hexagon-3f8891f4c7fe
Best regards,
--
Thomas Weißschuh <linux@weissschuh.net>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 1/3] tools/nolibc: split the architecture list into multiple lines
2026-08-19 6:31 [PATCH 0/3] tools/nolibc: hexagon support Thomas Weißschuh
@ 2026-08-19 6:31 ` Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 2/3] selftests/nolibc: prepare for clang-only architectures Thomas Weißschuh
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Thomas Weißschuh @ 2026-08-19 6:31 UTC (permalink / raw)
To: Brian Cain, Willy Tarreau, Shuah Khan
Cc: linux-hexagon, linux-kernel, linux-kselftest,
Thomas Weißschuh
The list is getting long, split it up for easier additions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
tools/include/nolibc/Makefile | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index 6d213d372bf8..b5897b3964f8 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -17,7 +17,22 @@ endif
# it defaults to this nolibc directory.
OUTPUT ?= $(CURDIR)/
-architectures := alpha arm arm64 loongarch m68k mips openrisc parisc powerpc riscv s390 sh sparc x86
+architectures := \
+ alpha \
+ arm \
+ arm64 \
+ loongarch \
+ m68k \
+ mips \
+ openrisc \
+ parisc \
+ powerpc \
+ riscv \
+ s390 \
+ sh \
+ sparc \
+ x86 \
+
arch_files := arch.h $(addsuffix .h, $(addprefix arch-, $(architectures)))
all_files := \
alloca.h \
--
2.55.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 2/3] selftests/nolibc: prepare for clang-only architectures
2026-08-19 6:31 [PATCH 0/3] tools/nolibc: hexagon support Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 1/3] tools/nolibc: split the architecture list into multiple lines Thomas Weißschuh
@ 2026-08-19 6:31 ` Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 3/3] tools/nolibc: add support for hexagon Thomas Weißschuh
2026-08-19 14:18 ` [PATCH 0/3] tools/nolibc: hexagon support Brian Cain
3 siblings, 0 replies; 6+ messages in thread
From: Thomas Weißschuh @ 2026-08-19 6:31 UTC (permalink / raw)
To: Brian Cain, Willy Tarreau, Shuah Khan
Cc: linux-hexagon, linux-kernel, linux-kselftest,
Thomas Weißschuh
Contrary to other architectures currently supported by nolibc,
hexagon can only be built with clang.
Prepare run-tests.sh to allow for this.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
tools/testing/selftests/nolibc/run-tests.sh | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/nolibc/run-tests.sh b/tools/testing/selftests/nolibc/run-tests.sh
index dc0b1649c641..5732b956ead9 100755
--- a/tools/testing/selftests/nolibc/run-tests.sh
+++ b/tools/testing/selftests/nolibc/run-tests.sh
@@ -132,6 +132,12 @@ crosstool_abi() {
esac
}
+need_gcc() {
+ case "$1" in
+ *) echo "1";;
+ esac
+}
+
download_crosstool() {
arch="$(crosstool_arch "$1")"
abi="$(crosstool_abi "$1")"
@@ -164,14 +170,18 @@ test_arch() {
arch=$1
ct_arch=$(crosstool_arch "$arch")
ct_abi=$(crosstool_abi "$1")
+ gcc="$(need_gcc "$1")"
+ cross_compile=
- if [ ! -d "${download_location}gcc-${crosstool_version}-nolibc/${ct_arch}-${ct_abi}/bin/." ]; then
+ if [ -n "$gcc" ] && [ ! -d "${download_location}gcc-${crosstool_version}-nolibc/${ct_arch}-${ct_abi}/bin/." ]; then
echo "No toolchain found in ${download_location}gcc-${crosstool_version}-nolibc/${ct_arch}-${ct_abi}."
echo "Did you install the toolchains or set the correct arch ? Rerun with -h for help."
return 1
fi
- cross_compile=$(realpath "${download_location}gcc-${crosstool_version}-nolibc/${ct_arch}-${ct_abi}/bin/${ct_arch}-${ct_abi}-")
+ if [ -n "$gcc" ]; then
+ cross_compile=$(realpath "${download_location}gcc-${crosstool_version}-nolibc/${ct_arch}-${ct_abi}/bin/${ct_arch}-${ct_abi}-")
+ fi
build_dir="${build_location}/${arch}"
if [ "$werror" -ne 0 ]; then
CFLAGS_EXTRA="$CFLAGS_EXTRA -Werror -Wl,--fatal-warnings"
--
2.55.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 3/3] tools/nolibc: add support for hexagon
2026-08-19 6:31 [PATCH 0/3] tools/nolibc: hexagon support Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 1/3] tools/nolibc: split the architecture list into multiple lines Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 2/3] selftests/nolibc: prepare for clang-only architectures Thomas Weißschuh
@ 2026-08-19 6:31 ` Thomas Weißschuh
2026-08-19 7:12 ` Willy Tarreau
2026-08-19 14:18 ` [PATCH 0/3] tools/nolibc: hexagon support Brian Cain
3 siblings, 1 reply; 6+ messages in thread
From: Thomas Weißschuh @ 2026-08-19 6:31 UTC (permalink / raw)
To: Brian Cain, Willy Tarreau, Shuah Khan
Cc: linux-hexagon, linux-kernel, linux-kselftest,
Thomas Weißschuh
A mostly straightforward new architecture with a few quirks:
* Only qemu-user is supported for testing.
* Clang is required for compilation.
* -fsanitize=undefined is broken.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
tools/include/nolibc/Makefile | 1 +
tools/include/nolibc/arch-hexagon.h | 164 +++++++++++++++++++++++++
tools/include/nolibc/arch.h | 2 +
tools/testing/selftests/nolibc/Makefile.nolibc | 8 ++
tools/testing/selftests/nolibc/run-tests.sh | 6 +
5 files changed, 181 insertions(+)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index b5897b3964f8..c4a0879e4140 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -21,6 +21,7 @@ architectures := \
alpha \
arm \
arm64 \
+ hexagon \
loongarch \
m68k \
mips \
diff --git a/tools/include/nolibc/arch-hexagon.h b/tools/include/nolibc/arch-hexagon.h
new file mode 100644
index 000000000000..2dcc69a47e9f
--- /dev/null
+++ b/tools/include/nolibc/arch-hexagon.h
@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * hexagon specific definitions for NOLIBC
+ * Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
+ */
+
+#ifndef _NOLIBC_ARCH_HEXAGON_H
+#define _NOLIBC_ARCH_HEXAGON_H
+
+#include <linux/unistd.h>
+
+#include "compiler.h"
+#include "crt.h"
+
+/*
+ * Syscalls for OpenRISC:
+ * - syscall number is passed in r6
+ * - arguments are in r0, r1, r2, r3, r4, r5
+ * - the system call is performed by calling trap0(#1)
+ * - syscall return value is in r0
+ */
+
+#define _NOLIBC_SYSCALL_CLOBBERLIST "memory"
+
+#define __nolibc_syscall0(num) \
+({ \
+ register long _num __asm__ ("r6") = (num); \
+ register long _arg1 __asm__ ("r0"); \
+ \
+ __asm__ volatile ( \
+ "trap0(#1)\n" \
+ : "=r"(_arg1) \
+ : "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg1; \
+})
+
+#define __nolibc_syscall1(num, arg1) \
+({ \
+ register long _num __asm__ ("r6") = (num); \
+ register long _arg1 __asm__ ("r0") = (long)(arg1); \
+ \
+ __asm__ volatile ( \
+ "trap0(#1)\n" \
+ : "+r"(_arg1) \
+ : "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg1; \
+})
+
+#define __nolibc_syscall2(num, arg1, arg2) \
+({ \
+ register long _num __asm__ ("r6") = (num); \
+ register long _arg1 __asm__ ("r0") = (long)(arg1); \
+ register long _arg2 __asm__ ("r1") = (long)(arg2); \
+ \
+ __asm__ volatile ( \
+ "trap0(#1)\n" \
+ : "+r"(_arg1) \
+ : "r"(_arg2), \
+ "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg1; \
+})
+
+#define __nolibc_syscall3(num, arg1, arg2, arg3) \
+({ \
+ register long _num __asm__ ("r6") = (num); \
+ register long _arg1 __asm__ ("r0") = (long)(arg1); \
+ register long _arg2 __asm__ ("r1") = (long)(arg2); \
+ register long _arg3 __asm__ ("r2") = (long)(arg3); \
+ \
+ __asm__ volatile ( \
+ "trap0(#1)\n" \
+ : "+r"(_arg1) \
+ : "r"(_arg2), "r"(_arg3), \
+ "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg1; \
+})
+
+#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \
+({ \
+ register long _num __asm__ ("r6") = (num); \
+ register long _arg1 __asm__ ("r0") = (long)(arg1); \
+ register long _arg2 __asm__ ("r1") = (long)(arg2); \
+ register long _arg3 __asm__ ("r2") = (long)(arg3); \
+ register long _arg4 __asm__ ("r3") = (long)(arg4); \
+ \
+ __asm__ volatile ( \
+ "trap0(#1)\n" \
+ : "+r"(_arg1) \
+ : "r"(_arg2), "r"(_arg3), "r"(_arg4), \
+ "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg1; \
+})
+
+#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
+({ \
+ register long _num __asm__ ("r6") = (num); \
+ register long _arg1 __asm__ ("r0") = (long)(arg1); \
+ register long _arg2 __asm__ ("r1") = (long)(arg2); \
+ register long _arg3 __asm__ ("r2") = (long)(arg3); \
+ register long _arg4 __asm__ ("r3") = (long)(arg4); \
+ register long _arg5 __asm__ ("r4") = (long)(arg5); \
+ \
+ __asm__ volatile ( \
+ "trap0(#1)\n" \
+ : "+r"(_arg1) \
+ : "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
+ "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg1; \
+})
+
+#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
+ register long _num __asm__ ("r6") = (num); \
+ register long _arg1 __asm__ ("r0") = (long)(arg1); \
+ register long _arg2 __asm__ ("r1") = (long)(arg2); \
+ register long _arg3 __asm__ ("r2") = (long)(arg3); \
+ register long _arg4 __asm__ ("r3") = (long)(arg4); \
+ register long _arg5 __asm__ ("r4") = (long)(arg5); \
+ register long _arg6 __asm__ ("r5") = (long)(arg6); \
+ \
+ __asm__ volatile ( \
+ "trap0(#1)\n" \
+ : "+r"(_arg1) \
+ : "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \
+ "r"(_num) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _arg1; \
+})
+
+#ifndef NOLIBC_NO_RUNTIME
+/* startup code */
+void __attribute__((weak, noreturn))
+__nolibc_entrypoint __nolibc_no_stack_protector
+_start(void)
+{
+ __asm__ volatile (
+ "r0 = sp\n" /* save stack pointer to r0, as arg1 of _start_c */
+ "call _start_c\n" /* transfer to c runtime */
+ );
+ __nolibc_entrypoint_epilogue();
+}
+#endif /* NOLIBC_NO_RUNTIME */
+
+static __attribute__((unused))
+int _sys_ftruncate64(int fd, uint32_t length0, uint32_t length1)
+{
+ return __nolibc_syscall4(__NR_ftruncate64, fd, 0, length0, length1);
+}
+#define _sys_ftruncate64 _sys_ftruncate64
+
+#endif /* _NOLIBC_ARCH_HEXAGON_H */
diff --git a/tools/include/nolibc/arch.h b/tools/include/nolibc/arch.h
index 06cc2dbe7a33..24e0ec4fb2db 100644
--- a/tools/include/nolibc/arch.h
+++ b/tools/include/nolibc/arch.h
@@ -34,6 +34,8 @@
#include "arch-parisc.h"
#elif defined(__alpha__)
#include "arch-alpha.h"
+#elif defined(__hexagon__)
+#include "arch-hexagon.h"
#else
#error Unsupported Architecture
#endif
diff --git a/tools/testing/selftests/nolibc/Makefile.nolibc b/tools/testing/selftests/nolibc/Makefile.nolibc
index f70c8dfca018..439677cbc5cf 100644
--- a/tools/testing/selftests/nolibc/Makefile.nolibc
+++ b/tools/testing/selftests/nolibc/Makefile.nolibc
@@ -206,6 +206,8 @@ CFLAGS_mips64be = -EB -mabi=64 -march=mips64r2
CFLAGS_loongarch = $(if $(LLVM),-fuse-ld=lld)
CFLAGS_sparc32 = $(call cc-option,-m32) -mcpu=v8
CFLAGS_sh4 = -ml -m4
+# github.com/llvm/llvm-project/issues/216765
+CFLAGS_hexagon = -fno-sanitize=undefined
ifeq ($(origin XARCH),command line)
CFLAGS_XARCH = $(CFLAGS_$(XARCH))
endif
@@ -222,6 +224,12 @@ LDFLAGS :=
# Modify CFLAGS based on LLVM=
include $(srctree)/tools/scripts/Makefile.include
+ifeq ($(ARCH),hexagon)
+# tools/scripts/Makefile.include requires CROSS_COMPILE which does not exist for hexagon
+CFLAGS += --target=hexagon-linux-musl
+CLANG_CROSS_FLAGS += --target=hexagon-linux-musl
+endif
+
REPORT ?= awk '/\[OK\][\r]*$$/{p++} /\[FAIL\][\r]*$$/{if (!f) printf("\n"); f++; print;} /\[SKIPPED\][\r]*$$/{s++} \
/^Total number of errors:/{done++} \
END{ printf("\n%3d test(s): %3d passed, %3d skipped, %3d failed => status: ", p+s+f, p, s, f); \
diff --git a/tools/testing/selftests/nolibc/run-tests.sh b/tools/testing/selftests/nolibc/run-tests.sh
index 5732b956ead9..3da806e2b302 100755
--- a/tools/testing/selftests/nolibc/run-tests.sh
+++ b/tools/testing/selftests/nolibc/run-tests.sh
@@ -31,6 +31,7 @@ all_archs=(
sh4
parisc32
alpha
+ hexagon
)
archs="${all_archs[@]}"
@@ -134,6 +135,7 @@ crosstool_abi() {
need_gcc() {
case "$1" in
+ hexagon);;
*) echo "1";;
esac
}
@@ -212,6 +214,10 @@ test_arch() {
echo "Unsupported configuration"
return
fi
+ if [ "$arch" = "hexagon" ] && [ -z "$llvm" -o "$test_mode" = "system" ]; then
+ echo "Unsupported configuration"
+ return
+ fi
mkdir -p "$build_dir"
swallow_output "${MAKE[@]}" defconfig
--
2.55.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH 3/3] tools/nolibc: add support for hexagon
2026-08-19 6:31 ` [PATCH 3/3] tools/nolibc: add support for hexagon Thomas Weißschuh
@ 2026-08-19 7:12 ` Willy Tarreau
0 siblings, 0 replies; 6+ messages in thread
From: Willy Tarreau @ 2026-08-19 7:12 UTC (permalink / raw)
To: Thomas Weißschuh
Cc: Brian Cain, Shuah Khan, linux-hexagon, linux-kernel,
linux-kselftest
Hi Thomas,
On Wed, Aug 19, 2026 at 08:31:53AM +0200, Thomas Weißschuh wrote:
> +++ b/tools/include/nolibc/arch-hexagon.h
> @@ -0,0 +1,164 @@
> +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
> +/*
> + * hexagon specific definitions for NOLIBC
> + * Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
> + */
> +
> +#ifndef _NOLIBC_ARCH_HEXAGON_H
> +#define _NOLIBC_ARCH_HEXAGON_H
> +
> +#include <linux/unistd.h>
> +
> +#include "compiler.h"
> +#include "crt.h"
> +
> +/*
> + * Syscalls for OpenRISC:
> + * - syscall number is passed in r6
> + * - arguments are in r0, r1, r2, r3, r4, r5
> + * - the system call is performed by calling trap0(#1)
> + * - syscall return value is in r0
> + */
I'm not familiar with hexagon, but the file is named hexagon and the
comment speaks about openrisc. Is this a leftover from a copy-paste,
or is there an untold relation between the two, that would then deserve
at least an extra line to explain to those who don't know when passing
by ?
Other than this detail, while I can't judge for the syscall instructions
for this arch, I'm fine with the rest of the patch and the series, so
feel free to add:
Acked-by: Willy Tarreau <w@1wt.eu>
Thanks,
Willy
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 0/3] tools/nolibc: hexagon support
2026-08-19 6:31 [PATCH 0/3] tools/nolibc: hexagon support Thomas Weißschuh
` (2 preceding siblings ...)
2026-08-19 6:31 ` [PATCH 3/3] tools/nolibc: add support for hexagon Thomas Weißschuh
@ 2026-08-19 14:18 ` Brian Cain
3 siblings, 0 replies; 6+ messages in thread
From: Brian Cain @ 2026-08-19 14:18 UTC (permalink / raw)
To: Thomas Weißschuh, Brian Cain, Willy Tarreau, Shuah Khan
Cc: linux-hexagon, linux-kernel, linux-kselftest
On 8/19/2026 1:31 AM, Thomas Weißschuh wrote:
> Add support for the hexagon architecture.
>
> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
> ---
Thanks, Thomas! I've got similar nolibc patches in my tree that I have
been sitting on - but I like yours better.
Aside from the copy/paste error Willy identified, LGTM:
Reviewed-by: Brian Cain <brian.cain@oss.qualcomm.com>
> Thomas Weißschuh (3):
> tools/nolibc: split the architecture list into multiple lines
> selftests/nolibc: prepare for clang-only architectures
> tools/nolibc: add support for hexagon
>
> tools/include/nolibc/Makefile | 18 ++-
> tools/include/nolibc/arch-hexagon.h | 164 +++++++++++++++++++++++++
> tools/include/nolibc/arch.h | 2 +
> tools/testing/selftests/nolibc/Makefile.nolibc | 8 ++
> tools/testing/selftests/nolibc/run-tests.sh | 20 ++-
> 5 files changed, 209 insertions(+), 3 deletions(-)
> ---
> base-commit: b58afc8d1cf85688601b8d7e271125fff666f661
> change-id: 20260511-nolibc-hexagon-3f8891f4c7fe
>
> Best regards,
> --
> Thomas Weißschuh <linux@weissschuh.net>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2026-08-19 14:18 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2026-08-19 6:31 [PATCH 0/3] tools/nolibc: hexagon support Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 1/3] tools/nolibc: split the architecture list into multiple lines Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 2/3] selftests/nolibc: prepare for clang-only architectures Thomas Weißschuh
2026-08-19 6:31 ` [PATCH 3/3] tools/nolibc: add support for hexagon Thomas Weißschuh
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