/*
* System call callback functions for SPUs
*/
#undef DEBUG
#include <linux/kallsyms.h>
#include <linux/module.h>
#include <linux/syscalls.h>
#include <asm/spu.h>
#include <asm/syscalls.h>
#include <asm/unistd.h>
/*
* This table defines the system calls that an SPU can call.
* It is currently a subset of the 64 bit powerpc system calls,
* with the exact semantics.
*
* The reasons for disabling some of the system calls are:
* 1. They interact with the way SPU syscalls are handled
* and we can't let them execute ever:
* restart_syscall, exit, for, execve, ptrace, ...
* 2. They are deprecated and replaced by other means:
* uselib, pciconfig_*, sysfs, ...
* 3. They are somewhat interacting with the system in a way
* we don't want an SPU to:
* reboot, init_module, mount, kexec_load
* 4. They are optional and we can't rely on them being
* linked into the kernel. Unfortunately, the cond_syscall
* helper does not work here as it does not add the necessary
* opd symbols:
* mbind, mq_open, ipc, ...
*/
static void *spu_syscall_table[] = {
#define SYSCALL(func) sys_ni_syscall,
#define COMPAT_SYS(func) sys_ni_syscall,
#define PPC_SYS(func) sys_ni_syscall,
#define OLDSYS(func) sys_ni_syscall,
#define SYS32ONLY(func) sys_ni_syscall,
#define SYSX(f, f3264, f32) sys_ni_syscall,
#define SYSCALL_SPU(func) sys_##func,
#define COMPAT_SYS_SPU(func) sys_##func,
#define PPC_SYS_SPU(func) ppc_##func,
#define SYSX_SPU(f, f3264, f32) f,
#include <asm/systbl.h>
};
long spu_sys_callback(struct spu_syscall_block *s)
{
long (*syscall)(u64 a1, u64 a2, u64 a3, u64 a4, u64 a5, u64 a6);
if (s->nr_ret >= ARRAY_SIZE(spu_syscall_table)) {
pr_debug("%s: invalid syscall #%lld", __func__, s->nr_ret);
return -ENOSYS;
}
syscall = spu_syscall_table[s->nr_ret];
#ifdef DEBUG
print_symbol(KERN_DEBUG "SPU-syscall %s:", (unsigned long)syscall);
printk("syscall%ld(%lx, %lx, %lx, %lx, %lx, %lx)\n",
s->nr_ret,
s->parm[0], s->parm[1], s->parm[2],
s->parm[3], s->parm[4], s->parm[5]);
#endif
return syscall(s->parm[0], s->parm[1], s->parm[2],
s->parm[3], s->parm[4], s->parm[5]);
}
EXPORT_SYMBOL_GPL(spu_sys_callback);
