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b58afc8d1c
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
160 lines
8.6 KiB
C
160 lines
8.6 KiB
C
/* 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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