1/*
2 * System call callback functions for SPUs
3 */
4
5#undef DEBUG
6
7#include <linux/kallsyms.h>
8#include <linux/export.h>
9#include <linux/syscalls.h>
10
11#include <asm/spu.h>
12#include <asm/syscalls.h>
13#include <asm/unistd.h>
14
15/*
16 * This table defines the system calls that an SPU can call.
17 * It is currently a subset of the 64 bit powerpc system calls,
18 * with the exact semantics.
19 *
20 * The reasons for disabling some of the system calls are:
21 * 1. They interact with the way SPU syscalls are handled
22 *    and we can't let them execute ever:
23 *	restart_syscall, exit, for, execve, ptrace, ...
24 * 2. They are deprecated and replaced by other means:
25 *	uselib, pciconfig_*, sysfs, ...
26 * 3. They are somewhat interacting with the system in a way
27 *    we don't want an SPU to:
28 *	reboot, init_module, mount, kexec_load
29 * 4. They are optional and we can't rely on them being
30 *    linked into the kernel. Unfortunately, the cond_syscall
31 *    helper does not work here as it does not add the necessary
32 *    opd symbols:
33 *	mbind, mq_open, ipc, ...
34 */
35
36static void *spu_syscall_table[] = {
37#define SYSCALL(func)		sys_ni_syscall,
38#define COMPAT_SYS(func)	sys_ni_syscall,
39#define PPC_SYS(func)		sys_ni_syscall,
40#define OLDSYS(func)		sys_ni_syscall,
41#define SYS32ONLY(func)		sys_ni_syscall,
42#define PPC64ONLY(func)		sys_ni_syscall,
43#define SYSX(f, f3264, f32)	sys_ni_syscall,
44
45#define SYSCALL_SPU(func)	sys_##func,
46#define COMPAT_SYS_SPU(func)	sys_##func,
47#define PPC_SYS_SPU(func)	ppc_##func,
48#define SYSX_SPU(f, f3264, f32)	f,
49
50#include <asm/systbl.h>
51};
52
53long spu_sys_callback(struct spu_syscall_block *s)
54{
55	long (*syscall)(u64 a1, u64 a2, u64 a3, u64 a4, u64 a5, u64 a6);
56
57	if (s->nr_ret >= ARRAY_SIZE(spu_syscall_table)) {
58		pr_debug("%s: invalid syscall #%lld", __func__, s->nr_ret);
59		return -ENOSYS;
60	}
61
62	syscall = spu_syscall_table[s->nr_ret];
63
64	pr_debug("SPU-syscall "
65		 "%pSR:syscall%lld(%llx, %llx, %llx, %llx, %llx, %llx)\n",
66		 syscall,
67		 s->nr_ret,
68		 s->parm[0], s->parm[1], s->parm[2],
69		 s->parm[3], s->parm[4], s->parm[5]);
70
71	return syscall(s->parm[0], s->parm[1], s->parm[2],
72		       s->parm[3], s->parm[4], s->parm[5]);
73}
74EXPORT_SYMBOL_GPL(spu_sys_callback);
75