1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * System call callback functions for SPUs 4 */ 5 6 #undef DEBUG 7 8 #include <linux/kallsyms.h> 9 #include <linux/export.h> 10 #include <linux/syscalls.h> 11 12 #include <asm/spu.h> 13 #include <asm/syscalls.h> 14 #include <asm/unistd.h> 15 16 /* 17 * This table defines the system calls that an SPU can call. 18 * It is currently a subset of the 64 bit powerpc system calls, 19 * with the exact semantics. 20 * 21 * The reasons for disabling some of the system calls are: 22 * 1. They interact with the way SPU syscalls are handled 23 * and we can't let them execute ever: 24 * restart_syscall, exit, for, execve, ptrace, ... 25 * 2. They are deprecated and replaced by other means: 26 * uselib, pciconfig_*, sysfs, ... 27 * 3. They are somewhat interacting with the system in a way 28 * we don't want an SPU to: 29 * reboot, init_module, mount, kexec_load 30 * 4. They are optional and we can't rely on them being 31 * linked into the kernel. Unfortunately, the cond_syscall 32 * helper does not work here as it does not add the necessary 33 * opd symbols: 34 * mbind, mq_open, ipc, ... 35 */ 36 37 static const syscall_fn spu_syscall_table[] = { 38 #define __SYSCALL_WITH_COMPAT(nr, entry, compat) __SYSCALL(nr, entry) 39 #define __SYSCALL(nr, entry) [nr] = (void *) entry, 40 #include <asm/syscall_table_spu.h> 41 }; 42 43 long spu_sys_callback(struct spu_syscall_block *s) 44 { 45 syscall_fn syscall; 46 47 if (s->nr_ret >= ARRAY_SIZE(spu_syscall_table)) { 48 pr_debug("%s: invalid syscall #%lld", __func__, s->nr_ret); 49 return -ENOSYS; 50 } 51 52 syscall = spu_syscall_table[s->nr_ret]; 53 54 pr_debug("SPU-syscall " 55 "%pSR:syscall%lld(%llx, %llx, %llx, %llx, %llx, %llx)\n", 56 syscall, 57 s->nr_ret, 58 s->parm[0], s->parm[1], s->parm[2], 59 s->parm[3], s->parm[4], s->parm[5]); 60 61 return syscall(s->parm[0], s->parm[1], s->parm[2], 62 s->parm[3], s->parm[4], s->parm[5]); 63 } 64 EXPORT_SYMBOL_GPL(spu_sys_callback); 65