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Message-Id: <20250713-nolibc-alpha-v1-1-10216333d308@weissschuh.net>
Date: Sun, 13 Jul 2025 22:08:08 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, Shuah Khan <shuah@...nel.org>,
Richard Henderson <richard.henderson@...aro.org>,
Matt Turner <mattst88@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-alpha@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] tools/nolibc: add support for Alpha
A straightforward new architecture.
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
Only tested on QEMU so far.
Testing on real hardware would be very welcome.
Test instructions:
$ cd tools/testings/selftests/nolibc/
$ make -f Makefile.nolibc ARCH=alpha CROSS_COMPILE=alpha-linux- nolibc-test
$ file nolibc-test
nolibc-test: ELF 64-bit LSB executable, Alpha (unofficial), version 1 (SYSV), statically linked, not stripped
$ ./nolibc-test
Running test 'startup'
0 argc = 1 [OK]
...
Total number of errors: 0
Exiting with status 0
---
tools/include/nolibc/arch-alpha.h | 164 +++++++++++++++++++++++++
tools/include/nolibc/arch.h | 2 +
tools/testing/selftests/nolibc/Makefile.nolibc | 5 +
tools/testing/selftests/nolibc/nolibc-test.c | 4 +
tools/testing/selftests/nolibc/run-tests.sh | 3 +-
5 files changed, 177 insertions(+), 1 deletion(-)
diff --git a/tools/include/nolibc/arch-alpha.h b/tools/include/nolibc/arch-alpha.h
new file mode 100644
index 0000000000000000000000000000000000000000..6b9bb6c749b931f30ce7bd6cd125622828405604
--- /dev/null
+++ b/tools/include/nolibc/arch-alpha.h
@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Alpha specific definitions for NOLIBC
+ * Copyright (C) 2025 Thomas Weißschuh <linux@...ssschuh.net>
+ */
+
+#ifndef _NOLIBC_ARCH_ALPHA_H
+#define _NOLIBC_ARCH_ALPHA_H
+
+#include "compiler.h"
+#include "crt.h"
+
+/*
+ * Syscalls for Alpha:
+ * - registers are 64-bit
+ * - syscall number is passed in $0/v0
+ * - the system call is performed by calling callsys
+ * - syscall return comes in $0/v0, error flag in $19/a4
+ * - arguments are passed in $16/a0 to $21/a5
+ * - GCC does not support symbol register names
+ */
+
+#define my_syscall0(num) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _ret __asm__ ("$0"); \
+ register long _err __asm__ ("$19"); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "=r"(_ret), "=r"(_err) \
+ : "r"(_num) \
+ : "memory", "cc" \
+ ); \
+ _err ? -_ret : _ret; \
+})
+
+#define my_syscall1(num, arg1) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _ret __asm__ ("$0"); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "=r"(_ret), "=r"(_err) \
+ : "r"(_num), "r"(_arg1) \
+ : "memory", "cc" \
+ ); \
+ _err ? -_ret : _ret; \
+})
+
+#define my_syscall2(num, arg1, arg2) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _ret __asm__ ("$0"); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "=r"(_ret), "=r"(_err) \
+ : "r"(_num), "r"(_arg1), "r"(_arg2) \
+ : "memory", "cc" \
+ ); \
+ _err ? -_ret : _ret; \
+})
+
+#define my_syscall3(num, arg1, arg2, arg3) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _ret __asm__ ("$0"); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "=r"(_ret), "=r"(_err) \
+ : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3) \
+ : "memory", "cc" \
+ ); \
+ _err ? -_ret : _ret; \
+})
+
+#define my_syscall4(num, arg1, arg2, arg3, arg4) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _ret __asm__ ("$0"); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ register long _arg4 __asm__ ("$19") = (long)(arg4); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "=r"(_ret), "=r"(_err) \
+ : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
+ : "memory", "cc" \
+ ); \
+ _err ? -_ret : _ret; \
+})
+
+#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _ret __asm__ ("$0"); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ register long _arg4 __asm__ ("$19") = (long)(arg4); \
+ register long _arg5 __asm__ ("$20") = (long)(arg5); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "=r"(_ret), "=r"(_err) \
+ : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), \
+ "r"(_arg5) \
+ : "memory", "cc" \
+ ); \
+ _err ? -_ret : _ret; \
+})
+
+#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _ret __asm__ ("$0"); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ register long _arg4 __asm__ ("$19") = (long)(arg4); \
+ register long _arg5 __asm__ ("$20") = (long)(arg5); \
+ register long _arg6 __asm__ ("$21") = (long)(arg6); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "=r"(_ret), "=r"(_err) \
+ : "r"(_num), "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), \
+ "r"(_arg5), "r"(_arg6) \
+ : "memory", "cc" \
+ ); \
+ _err ? -_ret : _ret; \
+})
+
+/* startup code */
+void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
+{
+ __asm__ volatile (
+ "br $gp, 0f\n" /* setup $gp, so that 'lda' works */
+ "0: ldgp $gp, 0($gp)\n"
+ "lda $27, _start_c\n" /* setup current function address for _start_c */
+ "mov $sp, $16\n" /* save argc pointer to $16, as arg1 of _start_c */
+ "br _start_c\n" /* transfer to c runtime */
+ );
+ __nolibc_entrypoint_epilogue();
+}
+
+#endif /* _NOLIBC_ARCH_ALPHA_H */
diff --git a/tools/include/nolibc/arch.h b/tools/include/nolibc/arch.h
index 426c89198135564acca44c485e5c2d8ba36a6fe9..72585d4c04e2896a275faadf881e98286f914fb3 100644
--- a/tools/include/nolibc/arch.h
+++ b/tools/include/nolibc/arch.h
@@ -37,6 +37,8 @@
#include "arch-m68k.h"
#elif defined(__sh__)
#include "arch-sh.h"
+#elif defined(__alpha__)
+#include "arch-alpha.h"
#else
#error Unsupported Architecture
#endif
diff --git a/tools/testing/selftests/nolibc/Makefile.nolibc b/tools/testing/selftests/nolibc/Makefile.nolibc
index 0fb759ba992ee6b1693b88f1b2e77463afa9f38b..0da33fe99bd630ec5100b5beed939d524af2b3d4 100644
--- a/tools/testing/selftests/nolibc/Makefile.nolibc
+++ b/tools/testing/selftests/nolibc/Makefile.nolibc
@@ -93,6 +93,7 @@ IMAGE_sparc32 = arch/sparc/boot/image
IMAGE_sparc64 = arch/sparc/boot/image
IMAGE_m68k = vmlinux
IMAGE_sh4 = arch/sh/boot/zImage
+IMAGE_alpha = vmlinux
IMAGE = $(objtree)/$(IMAGE_$(XARCH))
IMAGE_NAME = $(notdir $(IMAGE))
@@ -123,6 +124,7 @@ DEFCONFIG_sparc32 = sparc32_defconfig
DEFCONFIG_sparc64 = sparc64_defconfig
DEFCONFIG_m68k = virt_defconfig
DEFCONFIG_sh4 = rts7751r2dplus_defconfig
+DEFCONFIG_alpha = defconfig
DEFCONFIG = $(DEFCONFIG_$(XARCH))
EXTRACONFIG_x32 = -e CONFIG_X86_X32_ABI
@@ -130,6 +132,7 @@ EXTRACONFIG_arm = -e CONFIG_NAMESPACES
EXTRACONFIG_armthumb = -e CONFIG_NAMESPACES
EXTRACONFIG_m68k = -e CONFIG_BLK_DEV_INITRD
EXTRACONFIG_sh4 = -e CONFIG_BLK_DEV_INITRD -e CONFIG_CMDLINE_FROM_BOOTLOADER
+EXTRACONFIG_alpha = -e CONFIG_BLK_DEV_INITRD
EXTRACONFIG = $(EXTRACONFIG_$(XARCH))
# optional tests to run (default = all)
@@ -162,6 +165,7 @@ QEMU_ARCH_sparc32 = sparc
QEMU_ARCH_sparc64 = sparc64
QEMU_ARCH_m68k = m68k
QEMU_ARCH_sh4 = sh4
+QEMU_ARCH_alpha = alpha
QEMU_ARCH = $(QEMU_ARCH_$(XARCH))
QEMU_ARCH_USER_ppc64le = ppc64le
@@ -203,6 +207,7 @@ QEMU_ARGS_sparc32 = -M SS-5 -m 256M -append "console=ttyS0,115200 panic=-1 $(
QEMU_ARGS_sparc64 = -M sun4u -append "console=ttyS0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_m68k = -M virt -append "console=ttyGF0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_sh4 = -M r2d -serial file:/dev/stdout -append "console=ttySC1,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_alpha = -M clipper -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS = -m 1G $(QEMU_ARGS_$(XARCH)) $(QEMU_ARGS_BIOS) $(QEMU_ARGS_EXTRA)
# OUTPUT is only set when run from the main makefile, otherwise
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index a297ee0d6d0754dfcd9f9e5609d42c7442dabc4e..bbbb2a485f220fed69556baaf2603d9cf24a1c36 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -709,6 +709,10 @@ int run_startup(int min, int max)
/* checking NULL for argv/argv0, environ and _auxv is not enough, let's compare with sbrk(0) or &end */
extern char end;
char *brk = sbrk(0) != (void *)-1 ? sbrk(0) : &end;
+#if defined(__alpha__)
+ /* the ordering above does not work on an alpha kernel */
+ brk = NULL;
+#endif
/* differ from nolibc, both glibc and musl have no global _auxv */
const unsigned long *test_auxv = (void *)-1;
#ifdef NOLIBC
diff --git a/tools/testing/selftests/nolibc/run-tests.sh b/tools/testing/selftests/nolibc/run-tests.sh
index e8af1fb505cf3573b4a6b37228dee764fe2e5277..8ce57d7006594c531f471d777d579c4f08d87efe 100755
--- a/tools/testing/selftests/nolibc/run-tests.sh
+++ b/tools/testing/selftests/nolibc/run-tests.sh
@@ -28,6 +28,7 @@ all_archs=(
sparc32 sparc64
m68k
sh4
+ alpha
)
archs="${all_archs[@]}"
@@ -189,7 +190,7 @@ test_arch() {
echo "Unsupported configuration"
return
fi
- if [ "$arch" = "m68k" -o "$arch" = "sh4" ] && [ "$llvm" = "1" ]; then
+ if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "alpha" ] && [ "$llvm" = "1" ]; then
echo "Unsupported configuration"
return
fi
---
base-commit: b9e50363178a40c76bebaf2f00faa2b0b6baf8d1
change-id: 20250609-nolibc-alpha-33e79644544c
Best regards,
--
Thomas Weißschuh <linux@...ssschuh.net>
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