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
36 static 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
spu_sys_callback(struct spu_syscall_block * s)53 long 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 }
74 EXPORT_SYMBOL_GPL(spu_sys_callback);
75