From: Thomas Weißschuh Date: Tue, 21 Jul 2026 22:07:05 +0000 (+0200) Subject: tools/nolibc: add support for Alpha X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=b58afc8d1cf85688601b8d7e271125fff666f661;p=thirdparty%2Flinux.git tools/nolibc: add support for Alpha A straightforward new architecture. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Tested-by: Michael Cree Link: https://patch.msgid.link/20260722-nolibc-alpha-v2-1-4970e48eb7bf@weissschuh.net --- diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile index 00fd2e566d75..6d213d372bf8 100644 --- a/tools/include/nolibc/Makefile +++ b/tools/include/nolibc/Makefile @@ -17,7 +17,7 @@ endif # it defaults to this nolibc directory. OUTPUT ?= $(CURDIR)/ -architectures := 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 \ diff --git a/tools/include/nolibc/arch-alpha.h b/tools/include/nolibc/arch-alpha.h new file mode 100644 index 000000000000..04ff8a95c52c --- /dev/null +++ b/tools/include/nolibc/arch-alpha.h @@ -0,0 +1,159 @@ +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ +/* + * Alpha specific definitions for NOLIBC + * Copyright (C) 2025 Thomas Weißschuh + */ + +#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/a3 + * - arguments are passed in $16/a0 to $21/a5 + * - GCC does not support symbol register names + */ + +#define _NOLIBC_SYSCALL_CLOBBERLIST \ + "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", \ + "$22", "$23", "$24", "$25", "$27", "$28", "memory", "cc" + +#define __nolibc_syscall0(num) \ +({ \ + register long _num __asm__ ("$0") = (num); \ + register long _err __asm__ ("$19"); \ + \ + __asm__ volatile ( \ + "callsys" \ + : "+r"(_num), "=r"(_err) \ + : \ + : _NOLIBC_SYSCALL_CLOBBERLIST, \ + "$16", "$17", "$18", "$20", "$21" \ + ); \ + _err ? -_num : _num; \ +}) + +#define __nolibc_syscall1(num, arg1) \ +({ \ + register long _num __asm__ ("$0") = (num); \ + register long _err __asm__ ("$19"); \ + register long _arg1 __asm__ ("$16") = (long)(arg1); \ + \ + __asm__ volatile ( \ + "callsys" \ + : "+r"(_num), "=r"(_err) \ + : "r"(_arg1) \ + : _NOLIBC_SYSCALL_CLOBBERLIST, "$17", "$18", "$20", "$21" \ + ); \ + _err ? -_num : _num; \ +}) + +#define __nolibc_syscall2(num, arg1, arg2) \ +({ \ + register long _num __asm__ ("$0") = (num); \ + register long _err __asm__ ("$19"); \ + register long _arg1 __asm__ ("$16") = (long)(arg1); \ + register long _arg2 __asm__ ("$17") = (long)(arg2); \ + \ + __asm__ volatile ( \ + "callsys" \ + : "+r"(_num), "=r"(_err) \ + : "r"(_arg1), "r"(_arg2) \ + : _NOLIBC_SYSCALL_CLOBBERLIST, "$18", "$20", "$21" \ + ); \ + _err ? -_num : _num; \ +}) + +#define __nolibc_syscall3(num, arg1, arg2, arg3) \ +({ \ + register long _num __asm__ ("$0") = (num); \ + 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"(_num), "=r"(_err) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3) \ + : _NOLIBC_SYSCALL_CLOBBERLIST, "$20", "$21" \ + ); \ + _err ? -_num : _num; \ +}) + +#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \ +({ \ + register long _num __asm__ ("$0") = (num); \ + 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"(_num), "+r"(_arg4) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3) \ + : _NOLIBC_SYSCALL_CLOBBERLIST, "$20", "$21" \ + ); \ + _arg4 ? -_num : _num; \ +}) + +#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ +({ \ + register long _num __asm__ ("$0") = (num); \ + 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"(_num), "+r"(_arg4) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg5) \ + : _NOLIBC_SYSCALL_CLOBBERLIST, "$21" \ + ); \ + _arg4 ? -_num : _num; \ +}) + +#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ +({ \ + register long _num __asm__ ("$0") = (num); \ + 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"(_num), "+r"(_arg4) \ + : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg5), \ + "r"(_arg6) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg4 ? -_num : _num; \ +}) + +/* startup code */ +void __attribute__((weak, noreturn)) __nolibc_entrypoint __nolibc_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 b69d9c5ec5c6..06cc2dbe7a33 100644 --- a/tools/include/nolibc/arch.h +++ b/tools/include/nolibc/arch.h @@ -32,6 +32,8 @@ #include "arch-openrisc.h" #elif defined(__hppa__) #include "arch-parisc.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 06f881e2e90c..f70c8dfca018 100644 --- a/tools/testing/selftests/nolibc/Makefile.nolibc +++ b/tools/testing/selftests/nolibc/Makefile.nolibc @@ -112,6 +112,7 @@ EXTRACONFIG_armthumb = -e CONFIG_NAMESPACES EXTRACONFIG_sparc32 = -e CONFIG_TMPFS 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) @@ -174,6 +175,7 @@ QEMU_ARGS_m68k = -M virt -append "console=ttyGF0,115200 panic=-1 $(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_parisc32 = -M B160L -append "console=ttyS0 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) $(QEMU_ARGS_EXTRA) # OUTPUT is only set when run from the main makefile, otherwise diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 996e8d13508e..ed860b0a15a1 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -756,6 +756,10 @@ int run_startup(int min, int max) /* checking NULL for argv/argv0, environ and _auxv is not enough, let's compare with sbrk(0) or &end */ extern char end; char *brk = sbrk(0) != (void *)-1 ? sbrk(0) : &end; +#if defined(__alpha__) + /* the ordering above does not work on an alpha kernel due to STACK_TOP != TASK_SIZE */ + brk = NULL; +#endif /* differ from nolibc, both glibc and musl have no global _auxv */ const unsigned long *test_auxv = (void *)-1; #ifdef NOLIBC diff --git a/tools/testing/selftests/nolibc/run-tests.sh b/tools/testing/selftests/nolibc/run-tests.sh index 6460e25001de..dc0b1649c641 100755 --- a/tools/testing/selftests/nolibc/run-tests.sh +++ b/tools/testing/selftests/nolibc/run-tests.sh @@ -30,6 +30,7 @@ all_archs=( m68k sh4 parisc32 + alpha ) archs="${all_archs[@]}" @@ -193,7 +194,7 @@ test_arch() { exit 1 esac printf '%-15s' "$arch:" - if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" ] && [ "$llvm" = "1" ]; then + if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" -o "$arch" = "alpha" ] && [ "$llvm" = "1" ]; then echo "Unsupported configuration" return fi