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// SPDX-License-Identifier: GPL-2.0
/* System call table for x32 ABI. */
#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 <linux/syscalls.h>
#include <asm/unistd.h>
#include <asm/syscall.h>
/*
* Reuse the 64-bit entry points for the x32 versions that occupy different
* slots in the syscall table.
*/
#define __x32_sys_readv __x64_sys_readv
#define __x32_sys_writev __x64_sys_writev
#define __x32_sys_getsockopt __x64_sys_getsockopt
#define __x32_sys_setsockopt __x64_sys_setsockopt
#define __x32_sys_vmsplice __x64_sys_vmsplice
#define __x32_sys_process_vm_readv __x64_sys_process_vm_readv
#define __x32_sys_process_vm_writev __x64_sys_process_vm_writev
#define __SYSCALL_64(nr, sym)
#define __SYSCALL_X32(nr, sym) extern long __x32_##sym(const struct pt_regs *);
#define __SYSCALL_COMMON(nr, sym) extern long __x64_##sym(const struct pt_regs *);
#include <asm/syscalls_64.h>
#undef __SYSCALL_X32
#undef __SYSCALL_COMMON
#define __SYSCALL_X32(nr, sym) [nr] = __x32_##sym,
#define __SYSCALL_COMMON(nr, sym) [nr] = __x64_##sym,
asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_x32_syscall_max+1] = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
[0 ... __NR_x32_syscall_max] = &__x64_sys_ni_syscall,
#include <asm/syscalls_64.h>
};
/* 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);
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