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 COMPAT_SPU_NEW(func)	sys_##func,
48 #define SYSX_SPU(f, f3264, f32)	f,
49 
50 #include <asm/systbl.h>
51 };
52 
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