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(nr, entry) entry, 38 #include <asm/syscall_table_spu.h> 39 #undef __SYSCALL 40 }; 41 42 long spu_sys_callback(struct spu_syscall_block *s) 43 { 44 long (*syscall)(u64 a1, u64 a2, u64 a3, u64 a4, u64 a5, u64 a6); 45 46 if (s->nr_ret >= ARRAY_SIZE(spu_syscall_table)) { 47 pr_debug("%s: invalid syscall #%lld", __func__, s->nr_ret); 48 return -ENOSYS; 49 } 50 51 syscall = spu_syscall_table[s->nr_ret]; 52 53 pr_debug("SPU-syscall " 54 "%pSR:syscall%lld(%llx, %llx, %llx, %llx, %llx, %llx)\n", 55 syscall, 56 s->nr_ret, 57 s->parm[0], s->parm[1], s->parm[2], 58 s->parm[3], s->parm[4], s->parm[5]); 59 60 return syscall(s->parm[0], s->parm[1], s->parm[2], 61 s->parm[3], s->parm[4], s->parm[5]); 62 } 63 EXPORT_SYMBOL_GPL(spu_sys_callback); 64