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77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/* See the end of this file for copyright, license, and warranty information. */
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#include <arch/hardware.h>
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#include <ardix/types.h>
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#include <ardix/sched.h>
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#include <ardix/syscall.h>
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#include <errno.h>
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#include <stddef.h>
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#include <config.h>
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#ifdef CONFIG_CHECK_SYSCALL_SOURCE
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/* syscall.S */
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extern uint16_t __syscall_return_point;
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#endif
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void enter_syscall(struct exc_context *context)
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{
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enum syscall number = sc_num(context);
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long (*handler)(sysarg_t arg1, sysarg_t arg2, sysarg_t arg3,
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sysarg_t arg4, sysarg_t arg5, sysarg_t arg6);
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long sc_ret;
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# ifdef CONFIG_CHECK_SYSCALL_SOURCE
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/*
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* We need to ignore the program counter's LSB because the CPU uses
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* that as a flag for whether it's operating in ARM or Thumb mode;
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* the instructions are always 2-byte aligned. Additionally, the PC
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* points to the instruction *after* the SVC, not SVC itself.
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*/
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if (((uintptr_t)regs->sp->pc & 0xfffffffe) != (uintptr_t)&__syscall_return_point) {
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sc_set_rval(regs, -EACCES);
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return;
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}
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# endif
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if (number > NSYSCALLS) {
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sc_set_rval(context, -ENOSYS);
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return;
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}
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handler = sys_table[number];
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if (handler == NULL) {
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sc_set_rval(context, -ENOSYS);
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return;
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}
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current->tcb.exc_context = context;
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/* TODO: not every syscall uses the max amount of parameters (duh) */
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sc_ret = handler(sc_arg1(context), sc_arg2(context), sc_arg3(context),
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sc_arg4(context), sc_arg5(context), sc_arg6(context));
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sc_set_rval(context, sc_ret);
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}
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void enter_sched(struct exc_context *context)
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{
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current->tcb.exc_context = context;
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schedule();
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}
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/*
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* This file is part of Ardix.
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* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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