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74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/* See the end of this file for copyright, license, and warranty information. */
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#include <arch-generic/entry.h>
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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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int arch_enter(void *sp)
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{
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struct reg_snapshot *regs = sp;
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enum syscall sc_num = arch_syscall_num(regs);
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int (*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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int 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->hw.pc & 0xfffffffe) != (uintptr_t)&__syscall_return_point) {
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arch_syscall_set_rval(regs, -EACCES);
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return;
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}
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# endif
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if (sc_num > NSYSCALLS) {
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arch_syscall_set_rval(regs, -ENOSYS);
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return 0;
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}
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handler = sys_table[sc_num];
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if (handler == NULL) {
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arch_syscall_set_rval(regs, -ENOSYS);
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return 0;
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}
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/* TODO: not every syscall uses the max amount of parameters (duh) */
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sc_ret = handler(arch_syscall_arg1(regs), arch_syscall_arg2(regs), arch_syscall_arg3(regs),
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arch_syscall_arg4(regs), arch_syscall_arg5(regs), arch_syscall_arg6(regs));
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arch_syscall_set_rval(regs, sc_ret);
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int ret = need_resched;
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need_resched = 0;
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return ret;
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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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