ardix/arch/at91sam3x8e/entry.c
fef adccbef80d
arch/at91sam3x8e: fix compile error
Enabling CONFIG_CHECK_SYSCALL_SOURCE resulted in a
compile error because the corresponding code block
used an outdated variable name.  This commit fixes
the issue.
2022-09-26 12:59:37 +02:00

76 lines
2 KiB
C

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