arch/powerpc/platforms/cell/spu_callbacks.c

   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
  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);