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tools/nolibc: add support for OpenRISC / or1k

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Add support for OpenRISC / or1k to nolibc.

_start() uses the same wrapper construct as in arch-sh.h.
libgcc is necessary as OpenRISC is missing 64-bit multiplication.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Stafford Horne <shorne@gmail.com>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260429-nolibc-openrisc-v2-1-8d7d7a2f3fec@weissschuh.net
This commit is contained in:
Thomas Weißschuh 2026-04-15 11:11:31 +02:00
parent 92f1d3340a
commit 97d6655082
5 changed files with 170 additions and 2 deletions
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2
tools/include/nolibc/Makefile
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@ -17,7 +17,7 @@ endif
# it defaults to this nolibc directory.
OUTPUT ?= $(CURDIR)/
architectures := arm arm64 loongarch m68k mips powerpc riscv s390 sh sparc x86
architectures := arm arm64 loongarch m68k mips openrisc powerpc riscv s390 sh sparc x86
arch_files := arch.h $(addsuffix .h, $(addprefix arch-, $(architectures)))
all_files := \
alloca.h \

160
tools/include/nolibc/arch-openrisc.h Normal file
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@ -0,0 +1,160 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* OpenRISC specific definitions for NOLIBC
* Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
*/
#ifndef _NOLIBC_ARCH_OPENRISC_H
#define _NOLIBC_ARCH_OPENRISC_H
#include "compiler.h"
#include "crt.h"
/*
* Syscalls for OpenRISC:
* - syscall number is passed in r11
* - arguments are in r3, r4, r5, r6, r7, r8
* - the system call is performed by calling l.sys 1
* - syscall return value is in r11
*/
#define _NOLIBC_SYSCALL_CLOBBERLIST \
"r12", "r13", "r15", "r17", "r19", "r21", "r23", "r25", "r27", "r29", "r31", "memory"
#define __nolibc_syscall0(num) \
({ \
register long _num __asm__ ("r11") = (num); \
\
__asm__ volatile ( \
"l.sys 1\n" \
: "+r"(_num) \
: \
: "r3", "r4", "r5", "r6", "r7", "r8", \
_NOLIBC_SYSCALL_CLOBBERLIST \
); \
_num; \
})
#define __nolibc_syscall1(num, arg1) \
({ \
register long _num __asm__ ("r11") = (num); \
register long _arg1 __asm__ ("r3") = (long)(arg1); \
\
__asm__ volatile ( \
"l.sys 1\n" \
: "+r"(_num) \
: "r"(_arg1) \
: "r4", "r5", "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_num; \
})
#define __nolibc_syscall2(num, arg1, arg2) \
({ \
register long _num __asm__ ("r11") = (num); \
register long _arg1 __asm__ ("r3") = (long)(arg1); \
register long _arg2 __asm__ ("r4") = (long)(arg2); \
\
__asm__ volatile ( \
"l.sys 1\n" \
: "+r"(_num) \
: "r"(_arg1), "r"(_arg2) \
: "r5", "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_num; \
})
#define __nolibc_syscall3(num, arg1, arg2, arg3) \
({ \
register long _num __asm__ ("r11") = (num); \
register long _arg1 __asm__ ("r3") = (long)(arg1); \
register long _arg2 __asm__ ("r4") = (long)(arg2); \
register long _arg3 __asm__ ("r5") = (long)(arg3); \
\
__asm__ volatile ( \
"l.sys 1\n" \
: "+r"(_num) \
: "r"(_arg1), "r"(_arg2), "r"(_arg3) \
: "r6", "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_num; \
})
#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \
({ \
register long _num __asm__ ("r11") = (num); \
register long _arg1 __asm__ ("r3") = (long)(arg1); \
register long _arg2 __asm__ ("r4") = (long)(arg2); \
register long _arg3 __asm__ ("r5") = (long)(arg3); \
register long _arg4 __asm__ ("r6") = (long)(arg4); \
\
__asm__ volatile ( \
"l.sys 1\n" \
: "+r"(_num) \
: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
: "r7", "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_num; \
})
#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
({ \
register long _num __asm__ ("r11") = (num); \
register long _arg1 __asm__ ("r3") = (long)(arg1); \
register long _arg2 __asm__ ("r4") = (long)(arg2); \
register long _arg3 __asm__ ("r5") = (long)(arg3); \
register long _arg4 __asm__ ("r6") = (long)(arg4); \
register long _arg5 __asm__ ("r7") = (long)(arg5); \
\
__asm__ volatile ( \
"l.sys 1\n" \
: "+r"(_num) \
: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
: "r8", _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_num; \
})
#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
({ \
register long _num __asm__ ("r11") = (num); \
register long _arg1 __asm__ ("r3") = (long)(arg1); \
register long _arg2 __asm__ ("r4") = (long)(arg2); \
register long _arg3 __asm__ ("r5") = (long)(arg3); \
register long _arg4 __asm__ ("r6") = (long)(arg4); \
register long _arg5 __asm__ ("r7") = (long)(arg5); \
register long _arg6 __asm__ ("r8") = (long)(arg6); \
\
__asm__ volatile ( \
"l.sys 1\n" \
: "+r"(_num) \
: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
"r"(_arg6) \
: _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_num; \
})
#ifndef NOLIBC_NO_RUNTIME
/* startup code */
void _start_wrapper(void);
void __attribute__((weak,noreturn))
__nolibc_entrypoint __nolibc_no_stack_protector
_start_wrapper(void)
{
__asm__ volatile (
".global _start\n" /* The C function will have a prologue, */
".type _start, @function\n" /* corrupting "sp/r1" */
".weak _start\n"
"_start:\n"
"l.jal _start_c\n" /* transfer to c runtime */
"l.or r3,r1,r1\n" /* save stack pointer to r3, as arg1 of _start_c */
".size _start, .-_start\n"
);
__nolibc_entrypoint_epilogue();
}
#endif /* NOLIBC_NO_RUNTIME */
#endif /* _NOLIBC_ARCH_OPENRISC_H */

2
tools/include/nolibc/arch.h
View File

@ -28,6 +28,8 @@
#include "arch-m68k.h"
#elif defined(__sh__)
#include "arch-sh.h"
#elif defined(__or1k__)
#include "arch-openrisc.h"
#else
#error Unsupported Architecture
#endif

4
tools/testing/selftests/nolibc/Makefile.nolibc
View File

@ -102,6 +102,7 @@ DEFCONFIG_sparc32 = sparc32_defconfig
DEFCONFIG_sparc64 = sparc64_defconfig
DEFCONFIG_m68k = virt_defconfig
DEFCONFIG_sh4 = rts7751r2dplus_defconfig
DEFCONFIG_openrisc = virt_defconfig
DEFCONFIG = $(or $(DEFCONFIG_$(XARCH)),defconfig)
EXTRACONFIG_x32 = -e CONFIG_X86_X32_ABI
@ -128,6 +129,7 @@ QEMU_ARCH_mips64be = mips64
QEMU_ARCH_ppc64le = ppc64
QEMU_ARCH_loongarch = loongarch64
QEMU_ARCH_sparc32 = sparc
QEMU_ARCH_openrisc = or1k
QEMU_ARCH = $(or $(QEMU_ARCH_$(XARCH)),$(XARCH))
QEMU_ARCH_USER_ppc64le = ppc64le
@ -167,6 +169,7 @@ 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_openrisc = -M virt -m 512M -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
@ -201,6 +204,7 @@ CFLAGS_XARCH = $(CFLAGS_$(XARCH))
endif
LDLIBS_ppc = $(if $(LLVM),,-lgcc)
LDLIBS_openrisc = $(if $(LLVM),,-lgcc)
LDLIBS = $(LDLIBS_$(XARCH))
include Makefile.include

4
tools/testing/selftests/nolibc/run-tests.sh
View File

@ -21,6 +21,7 @@ all_archs=(
i386 x86_64 x32
arm64 arm armthumb
mips32le mips32be mipsn32le mipsn32be mips64le mips64be
openrisc
ppc ppc64 ppc64le
riscv32 riscv64
s390x
@ -107,6 +108,7 @@ crosstool_arch() {
case "$1" in
arm64) echo aarch64;;
armthumb) echo arm;;
openrisc) echo or1k;;
ppc) echo powerpc;;
ppc64) echo powerpc64;;
ppc64le) echo powerpc64;;
@ -185,7 +187,7 @@ test_arch() {
exit 1
esac
printf '%-15s' "$arch:"
if [ "$arch" = "m68k" -o "$arch" = "sh4" ] && [ "$llvm" = "1" ]; then
if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" ] && [ "$llvm" = "1" ]; then
echo "Unsupported configuration"
return
fi