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tools/nolibc: add support for Alpha
A straightforward new architecture. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Tested-by: Michael Cree <mcree@orcon.net.nz> Link: https://patch.msgid.link/20260722-nolibc-alpha-v2-1-4970e48eb7bf@weissschuh.net
This commit is contained in:
Thomas Weißschuh
parent
b9fc5a1742
commit
b58afc8d1c
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@ -17,7 +17,7 @@ endif
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# it defaults to this nolibc directory.
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OUTPUT ?= $(CURDIR)/
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architectures := arm arm64 loongarch m68k mips openrisc parisc powerpc riscv s390 sh sparc x86
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architectures := alpha arm arm64 loongarch m68k mips openrisc parisc powerpc riscv s390 sh sparc x86
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arch_files := arch.h $(addsuffix .h, $(addprefix arch-, $(architectures)))
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all_files := \
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alloca.h \
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159
tools/include/nolibc/arch-alpha.h
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159
tools/include/nolibc/arch-alpha.h
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@ -0,0 +1,159 @@
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* Alpha specific definitions for NOLIBC
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* Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
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*/
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#ifndef _NOLIBC_ARCH_ALPHA_H
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#define _NOLIBC_ARCH_ALPHA_H
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#include "compiler.h"
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#include "crt.h"
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/*
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* Syscalls for Alpha:
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* - registers are 64-bit
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* - syscall number is passed in $0/v0
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* - the system call is performed by calling callsys
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* - syscall return comes in $0/v0, error flag in $19/a3
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* - arguments are passed in $16/a0 to $21/a5
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* - GCC does not support symbol register names
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*/
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#define _NOLIBC_SYSCALL_CLOBBERLIST \
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"$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", \
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"$22", "$23", "$24", "$25", "$27", "$28", "memory", "cc"
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#define __nolibc_syscall0(num) \
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({ \
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register long _num __asm__ ("$0") = (num); \
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register long _err __asm__ ("$19"); \
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\
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__asm__ volatile ( \
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"callsys" \
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: "+r"(_num), "=r"(_err) \
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: \
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: _NOLIBC_SYSCALL_CLOBBERLIST, \
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"$16", "$17", "$18", "$20", "$21" \
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); \
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_err ? -_num : _num; \
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})
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#define __nolibc_syscall1(num, arg1) \
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({ \
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register long _num __asm__ ("$0") = (num); \
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register long _err __asm__ ("$19"); \
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register long _arg1 __asm__ ("$16") = (long)(arg1); \
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\
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__asm__ volatile ( \
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"callsys" \
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: "+r"(_num), "=r"(_err) \
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: "r"(_arg1) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, "$17", "$18", "$20", "$21" \
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); \
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_err ? -_num : _num; \
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})
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#define __nolibc_syscall2(num, arg1, arg2) \
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({ \
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register long _num __asm__ ("$0") = (num); \
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register long _err __asm__ ("$19"); \
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register long _arg1 __asm__ ("$16") = (long)(arg1); \
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register long _arg2 __asm__ ("$17") = (long)(arg2); \
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\
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__asm__ volatile ( \
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"callsys" \
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: "+r"(_num), "=r"(_err) \
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: "r"(_arg1), "r"(_arg2) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, "$18", "$20", "$21" \
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); \
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_err ? -_num : _num; \
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})
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#define __nolibc_syscall3(num, arg1, arg2, arg3) \
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({ \
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register long _num __asm__ ("$0") = (num); \
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register long _err __asm__ ("$19"); \
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register long _arg1 __asm__ ("$16") = (long)(arg1); \
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register long _arg2 __asm__ ("$17") = (long)(arg2); \
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register long _arg3 __asm__ ("$18") = (long)(arg3); \
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\
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__asm__ volatile ( \
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"callsys" \
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: "+r"(_num), "=r"(_err) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, "$20", "$21" \
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); \
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_err ? -_num : _num; \
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})
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#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \
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({ \
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register long _num __asm__ ("$0") = (num); \
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register long _arg1 __asm__ ("$16") = (long)(arg1); \
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register long _arg2 __asm__ ("$17") = (long)(arg2); \
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register long _arg3 __asm__ ("$18") = (long)(arg3); \
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register long _arg4 __asm__ ("$19") = (long)(arg4); \
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\
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__asm__ volatile ( \
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"callsys" \
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: "+r"(_num), "+r"(_arg4) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, "$20", "$21" \
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); \
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_arg4 ? -_num : _num; \
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})
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#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
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({ \
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register long _num __asm__ ("$0") = (num); \
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register long _arg1 __asm__ ("$16") = (long)(arg1); \
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register long _arg2 __asm__ ("$17") = (long)(arg2); \
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register long _arg3 __asm__ ("$18") = (long)(arg3); \
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register long _arg4 __asm__ ("$19") = (long)(arg4); \
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register long _arg5 __asm__ ("$20") = (long)(arg5); \
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\
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__asm__ volatile ( \
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"callsys" \
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: "+r"(_num), "+r"(_arg4) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg5) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, "$21" \
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); \
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_arg4 ? -_num : _num; \
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})
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#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
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({ \
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register long _num __asm__ ("$0") = (num); \
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register long _arg1 __asm__ ("$16") = (long)(arg1); \
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register long _arg2 __asm__ ("$17") = (long)(arg2); \
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register long _arg3 __asm__ ("$18") = (long)(arg3); \
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register long _arg4 __asm__ ("$19") = (long)(arg4); \
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register long _arg5 __asm__ ("$20") = (long)(arg5); \
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register long _arg6 __asm__ ("$21") = (long)(arg6); \
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\
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__asm__ volatile ( \
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"callsys" \
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: "+r"(_num), "+r"(_arg4) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg5), \
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"r"(_arg6) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_arg4 ? -_num : _num; \
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})
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/* startup code */
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void __attribute__((weak, noreturn)) __nolibc_entrypoint __nolibc_no_stack_protector
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_start(void)
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{
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__asm__ volatile (
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"br $gp, 0f\n" /* setup $gp, so that 'lda' works */
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"0: ldgp $gp, 0($gp)\n"
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"lda $27, _start_c\n" /* setup current function address for _start_c */
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"mov $sp, $16\n" /* save argc pointer to $16, as arg1 of _start_c */
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"br _start_c\n" /* transfer to c runtime */
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);
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__nolibc_entrypoint_epilogue();
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}
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#endif /* _NOLIBC_ARCH_ALPHA_H */
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@ -32,6 +32,8 @@
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#include "arch-openrisc.h"
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#elif defined(__hppa__)
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#include "arch-parisc.h"
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#elif defined(__alpha__)
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#include "arch-alpha.h"
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#else
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#error Unsupported Architecture
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#endif
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@ -112,6 +112,7 @@ EXTRACONFIG_armthumb = -e CONFIG_NAMESPACES
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EXTRACONFIG_sparc32 = -e CONFIG_TMPFS
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EXTRACONFIG_m68k = -e CONFIG_BLK_DEV_INITRD
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EXTRACONFIG_sh4 = -e CONFIG_BLK_DEV_INITRD -e CONFIG_CMDLINE_FROM_BOOTLOADER
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EXTRACONFIG_alpha = -e CONFIG_BLK_DEV_INITRD
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EXTRACONFIG = $(EXTRACONFIG_$(XARCH))
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# optional tests to run (default = all)
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@ -174,6 +175,7 @@ QEMU_ARGS_m68k = -M virt -append "console=ttyGF0,115200 panic=-1 $(TEST:%=
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QEMU_ARGS_sh4 = -M r2d -serial file:/dev/stdout -append "console=ttySC1,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS_openrisc = -M virt -m 512M -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS_parisc32 = -M B160L -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS_alpha = -M clipper -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS = -m 1G $(QEMU_ARGS_$(XARCH)) $(QEMU_ARGS_BIOS) $(QEMU_ARGS_EXTRA)
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# OUTPUT is only set when run from the main makefile, otherwise
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@ -756,6 +756,10 @@ int run_startup(int min, int max)
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/* checking NULL for argv/argv0, environ and _auxv is not enough, let's compare with sbrk(0) or &end */
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extern char end;
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char *brk = sbrk(0) != (void *)-1 ? sbrk(0) : &end;
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#if defined(__alpha__)
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/* the ordering above does not work on an alpha kernel due to STACK_TOP != TASK_SIZE */
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brk = NULL;
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#endif
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/* differ from nolibc, both glibc and musl have no global _auxv */
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const unsigned long *test_auxv = (void *)-1;
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#ifdef NOLIBC
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@ -30,6 +30,7 @@ all_archs=(
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m68k
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sh4
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parisc32
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alpha
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)
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archs="${all_archs[@]}"
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@ -193,7 +194,7 @@ test_arch() {
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exit 1
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esac
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printf '%-15s' "$arch:"
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if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" ] && [ "$llvm" = "1" ]; then
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if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" -o "$arch" = "alpha" ] && [ "$llvm" = "1" ]; then
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echo "Unsupported configuration"
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return
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fi
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