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// SPDX-License-Identifier: GPL-2.0
/* System call table for x86-64. */
#include <linux/linkage.h>
#include <linux/sys.h>
#include <linux/cache.h>
#include <linux/moduleparam.h>
#undef MODULE_PARAM_PREFIX
#define MODULE_PARAM_PREFIX "syscall."
#include <asm/asm-offsets.h>
#include <asm/syscall.h>
/* this is a lie, but it does not hurt as sys_ni_syscall just returns -EINVAL */
extern asmlinkage long sys_ni_syscall(const struct pt_regs *);
#define __SYSCALL_64(nr, sym, qual) extern asmlinkage long sym(const struct pt_regs *);
#include <asm/syscalls_64.h>
#undef __SYSCALL_64
#define __SYSCALL_64(nr, sym, qual) [nr] = sym,
asmlinkage const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
[0 ... __NR_syscall_max] = &sys_ni_syscall,
#include <asm/syscalls_64.h>
};
#ifdef CONFIG_X86_X32_ABI
/* Maybe enable x32 syscalls */
#if defined(CONFIG_X86_X32_DISABLED)
DEFINE_STATIC_KEY_FALSE(x32_enabled_skey);
#else
DEFINE_STATIC_KEY_TRUE(x32_enabled_skey);
#endif
static int __init x32_param_set(const char *val, const struct kernel_param *p)
{
bool enabled;
int ret;
ret = kstrtobool(val, &enabled);
if (ret)
return ret;
if (IS_ENABLED(CONFIG_X86_X32_DISABLED)) {
if (enabled) {
static_key_enable(&x32_enabled_skey.key);
pr_info("Enabled x32 syscalls\n");
}
} else {
if (!enabled) {
static_key_disable(&x32_enabled_skey.key);
pr_info("Disabled x32 syscalls\n");
}
}
return 0;
}
static int x32_param_get(char *buffer, const struct kernel_param *p)
{
return sprintf(buffer, "%c\n",
static_key_enabled(&x32_enabled_skey) ? 'Y' : 'N');
}
static const struct kernel_param_ops x32_param_ops = {
.set = x32_param_set,
.get = x32_param_get,
};
arch_param_cb(x32, &x32_param_ops, NULL, 0444);
#endif
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