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0001 // SPDX-License-Identifier: GPL-2.0
0002 /* linux/arch/sparc64/kernel/sys_sparc.c
0003  *
0004  * This file contains various random system calls that
0005  * have a non-standard calling sequence on the Linux/sparc
0006  * platform.
0007  */
0008 
0009 #include <linux/errno.h>
0010 #include <linux/types.h>
0011 #include <linux/sched/signal.h>
0012 #include <linux/sched/mm.h>
0013 #include <linux/sched/debug.h>
0014 #include <linux/fs.h>
0015 #include <linux/file.h>
0016 #include <linux/mm.h>
0017 #include <linux/sem.h>
0018 #include <linux/msg.h>
0019 #include <linux/shm.h>
0020 #include <linux/stat.h>
0021 #include <linux/mman.h>
0022 #include <linux/utsname.h>
0023 #include <linux/smp.h>
0024 #include <linux/slab.h>
0025 #include <linux/syscalls.h>
0026 #include <linux/ipc.h>
0027 #include <linux/personality.h>
0028 #include <linux/random.h>
0029 #include <linux/export.h>
0030 #include <linux/context_tracking.h>
0031 #include <linux/timex.h>
0032 #include <linux/uaccess.h>
0033 
0034 #include <asm/utrap.h>
0035 #include <asm/unistd.h>
0036 
0037 #include "entry.h"
0038 #include "kernel.h"
0039 #include "systbls.h"
0040 
0041 /* #define DEBUG_UNIMP_SYSCALL */
0042 
0043 SYSCALL_DEFINE0(getpagesize)
0044 {
0045     return PAGE_SIZE;
0046 }
0047 
0048 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
0049  * overflow past the end of the 64-bit address space?
0050  */
0051 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
0052 {
0053     unsigned long va_exclude_start, va_exclude_end;
0054 
0055     va_exclude_start = VA_EXCLUDE_START;
0056     va_exclude_end   = VA_EXCLUDE_END;
0057 
0058     if (unlikely(len >= va_exclude_start))
0059         return 1;
0060 
0061     if (unlikely((addr + len) < addr))
0062         return 1;
0063 
0064     if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
0065              ((addr + len) >= va_exclude_start &&
0066               (addr + len) < va_exclude_end)))
0067         return 1;
0068 
0069     return 0;
0070 }
0071 
0072 /* These functions differ from the default implementations in
0073  * mm/mmap.c in two ways:
0074  *
0075  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
0076  *    for fixed such mappings we just validate what the user gave us.
0077  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
0078  *    the spitfire/niagara VA-hole.
0079  */
0080 
0081 static inline unsigned long COLOR_ALIGN(unsigned long addr,
0082                      unsigned long pgoff)
0083 {
0084     unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
0085     unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
0086 
0087     return base + off;
0088 }
0089 
0090 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
0091 {
0092     struct mm_struct *mm = current->mm;
0093     struct vm_area_struct * vma;
0094     unsigned long task_size = TASK_SIZE;
0095     int do_color_align;
0096     struct vm_unmapped_area_info info;
0097 
0098     if (flags & MAP_FIXED) {
0099         /* We do not accept a shared mapping if it would violate
0100          * cache aliasing constraints.
0101          */
0102         if ((flags & MAP_SHARED) &&
0103             ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
0104             return -EINVAL;
0105         return addr;
0106     }
0107 
0108     if (test_thread_flag(TIF_32BIT))
0109         task_size = STACK_TOP32;
0110     if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
0111         return -ENOMEM;
0112 
0113     do_color_align = 0;
0114     if (filp || (flags & MAP_SHARED))
0115         do_color_align = 1;
0116 
0117     if (addr) {
0118         if (do_color_align)
0119             addr = COLOR_ALIGN(addr, pgoff);
0120         else
0121             addr = PAGE_ALIGN(addr);
0122 
0123         vma = find_vma(mm, addr);
0124         if (task_size - len >= addr &&
0125             (!vma || addr + len <= vm_start_gap(vma)))
0126             return addr;
0127     }
0128 
0129     info.flags = 0;
0130     info.length = len;
0131     info.low_limit = TASK_UNMAPPED_BASE;
0132     info.high_limit = min(task_size, VA_EXCLUDE_START);
0133     info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
0134     info.align_offset = pgoff << PAGE_SHIFT;
0135     addr = vm_unmapped_area(&info);
0136 
0137     if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
0138         VM_BUG_ON(addr != -ENOMEM);
0139         info.low_limit = VA_EXCLUDE_END;
0140         info.high_limit = task_size;
0141         addr = vm_unmapped_area(&info);
0142     }
0143 
0144     return addr;
0145 }
0146 
0147 unsigned long
0148 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
0149               const unsigned long len, const unsigned long pgoff,
0150               const unsigned long flags)
0151 {
0152     struct vm_area_struct *vma;
0153     struct mm_struct *mm = current->mm;
0154     unsigned long task_size = STACK_TOP32;
0155     unsigned long addr = addr0;
0156     int do_color_align;
0157     struct vm_unmapped_area_info info;
0158 
0159     /* This should only ever run for 32-bit processes.  */
0160     BUG_ON(!test_thread_flag(TIF_32BIT));
0161 
0162     if (flags & MAP_FIXED) {
0163         /* We do not accept a shared mapping if it would violate
0164          * cache aliasing constraints.
0165          */
0166         if ((flags & MAP_SHARED) &&
0167             ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
0168             return -EINVAL;
0169         return addr;
0170     }
0171 
0172     if (unlikely(len > task_size))
0173         return -ENOMEM;
0174 
0175     do_color_align = 0;
0176     if (filp || (flags & MAP_SHARED))
0177         do_color_align = 1;
0178 
0179     /* requesting a specific address */
0180     if (addr) {
0181         if (do_color_align)
0182             addr = COLOR_ALIGN(addr, pgoff);
0183         else
0184             addr = PAGE_ALIGN(addr);
0185 
0186         vma = find_vma(mm, addr);
0187         if (task_size - len >= addr &&
0188             (!vma || addr + len <= vm_start_gap(vma)))
0189             return addr;
0190     }
0191 
0192     info.flags = VM_UNMAPPED_AREA_TOPDOWN;
0193     info.length = len;
0194     info.low_limit = PAGE_SIZE;
0195     info.high_limit = mm->mmap_base;
0196     info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
0197     info.align_offset = pgoff << PAGE_SHIFT;
0198     addr = vm_unmapped_area(&info);
0199 
0200     /*
0201      * A failed mmap() very likely causes application failure,
0202      * so fall back to the bottom-up function here. This scenario
0203      * can happen with large stack limits and large mmap()
0204      * allocations.
0205      */
0206     if (addr & ~PAGE_MASK) {
0207         VM_BUG_ON(addr != -ENOMEM);
0208         info.flags = 0;
0209         info.low_limit = TASK_UNMAPPED_BASE;
0210         info.high_limit = STACK_TOP32;
0211         addr = vm_unmapped_area(&info);
0212     }
0213 
0214     return addr;
0215 }
0216 
0217 /* Try to align mapping such that we align it as much as possible. */
0218 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
0219 {
0220     unsigned long align_goal, addr = -ENOMEM;
0221     unsigned long (*get_area)(struct file *, unsigned long,
0222                   unsigned long, unsigned long, unsigned long);
0223 
0224     get_area = current->mm->get_unmapped_area;
0225 
0226     if (flags & MAP_FIXED) {
0227         /* Ok, don't mess with it. */
0228         return get_area(NULL, orig_addr, len, pgoff, flags);
0229     }
0230     flags &= ~MAP_SHARED;
0231 
0232     align_goal = PAGE_SIZE;
0233     if (len >= (4UL * 1024 * 1024))
0234         align_goal = (4UL * 1024 * 1024);
0235     else if (len >= (512UL * 1024))
0236         align_goal = (512UL * 1024);
0237     else if (len >= (64UL * 1024))
0238         align_goal = (64UL * 1024);
0239 
0240     do {
0241         addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
0242         if (!(addr & ~PAGE_MASK)) {
0243             addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
0244             break;
0245         }
0246 
0247         if (align_goal == (4UL * 1024 * 1024))
0248             align_goal = (512UL * 1024);
0249         else if (align_goal == (512UL * 1024))
0250             align_goal = (64UL * 1024);
0251         else
0252             align_goal = PAGE_SIZE;
0253     } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
0254 
0255     /* Mapping is smaller than 64K or larger areas could not
0256      * be obtained.
0257      */
0258     if (addr & ~PAGE_MASK)
0259         addr = get_area(NULL, orig_addr, len, pgoff, flags);
0260 
0261     return addr;
0262 }
0263 EXPORT_SYMBOL(get_fb_unmapped_area);
0264 
0265 /* Essentially the same as PowerPC.  */
0266 static unsigned long mmap_rnd(void)
0267 {
0268     unsigned long rnd = 0UL;
0269 
0270     if (current->flags & PF_RANDOMIZE) {
0271         unsigned long val = get_random_long();
0272         if (test_thread_flag(TIF_32BIT))
0273             rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
0274         else
0275             rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
0276     }
0277     return rnd << PAGE_SHIFT;
0278 }
0279 
0280 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
0281 {
0282     unsigned long random_factor = mmap_rnd();
0283     unsigned long gap;
0284 
0285     /*
0286      * Fall back to the standard layout if the personality
0287      * bit is set, or if the expected stack growth is unlimited:
0288      */
0289     gap = rlim_stack->rlim_cur;
0290     if (!test_thread_flag(TIF_32BIT) ||
0291         (current->personality & ADDR_COMPAT_LAYOUT) ||
0292         gap == RLIM_INFINITY ||
0293         sysctl_legacy_va_layout) {
0294         mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
0295         mm->get_unmapped_area = arch_get_unmapped_area;
0296     } else {
0297         /* We know it's 32-bit */
0298         unsigned long task_size = STACK_TOP32;
0299 
0300         if (gap < 128 * 1024 * 1024)
0301             gap = 128 * 1024 * 1024;
0302         if (gap > (task_size / 6 * 5))
0303             gap = (task_size / 6 * 5);
0304 
0305         mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
0306         mm->get_unmapped_area = arch_get_unmapped_area_topdown;
0307     }
0308 }
0309 
0310 /*
0311  * sys_pipe() is the normal C calling standard for creating
0312  * a pipe. It's not the way unix traditionally does this, though.
0313  */
0314 SYSCALL_DEFINE0(sparc_pipe)
0315 {
0316     int fd[2];
0317     int error;
0318 
0319     error = do_pipe_flags(fd, 0);
0320     if (error)
0321         goto out;
0322     current_pt_regs()->u_regs[UREG_I1] = fd[1];
0323     error = fd[0];
0324 out:
0325     return error;
0326 }
0327 
0328 /*
0329  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
0330  *
0331  * This is really horribly ugly.
0332  */
0333 
0334 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
0335         unsigned long, third, void __user *, ptr, long, fifth)
0336 {
0337     long err;
0338 
0339     if (!IS_ENABLED(CONFIG_SYSVIPC))
0340         return -ENOSYS;
0341 
0342     /* No need for backward compatibility. We can start fresh... */
0343     if (call <= SEMTIMEDOP) {
0344         switch (call) {
0345         case SEMOP:
0346             err = ksys_semtimedop(first, ptr,
0347                           (unsigned int)second, NULL);
0348             goto out;
0349         case SEMTIMEDOP:
0350             err = ksys_semtimedop(first, ptr, (unsigned int)second,
0351                 (const struct __kernel_timespec __user *)
0352                           (unsigned long) fifth);
0353             goto out;
0354         case SEMGET:
0355             err = ksys_semget(first, (int)second, (int)third);
0356             goto out;
0357         case SEMCTL: {
0358             err = ksys_old_semctl(first, second,
0359                           (int)third | IPC_64,
0360                           (unsigned long) ptr);
0361             goto out;
0362         }
0363         default:
0364             err = -ENOSYS;
0365             goto out;
0366         }
0367     }
0368     if (call <= MSGCTL) {
0369         switch (call) {
0370         case MSGSND:
0371             err = ksys_msgsnd(first, ptr, (size_t)second,
0372                      (int)third);
0373             goto out;
0374         case MSGRCV:
0375             err = ksys_msgrcv(first, ptr, (size_t)second, fifth,
0376                      (int)third);
0377             goto out;
0378         case MSGGET:
0379             err = ksys_msgget((key_t)first, (int)second);
0380             goto out;
0381         case MSGCTL:
0382             err = ksys_old_msgctl(first, (int)second | IPC_64, ptr);
0383             goto out;
0384         default:
0385             err = -ENOSYS;
0386             goto out;
0387         }
0388     }
0389     if (call <= SHMCTL) {
0390         switch (call) {
0391         case SHMAT: {
0392             ulong raddr;
0393             err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
0394             if (!err) {
0395                 if (put_user(raddr,
0396                          (ulong __user *) third))
0397                     err = -EFAULT;
0398             }
0399             goto out;
0400         }
0401         case SHMDT:
0402             err = ksys_shmdt(ptr);
0403             goto out;
0404         case SHMGET:
0405             err = ksys_shmget(first, (size_t)second, (int)third);
0406             goto out;
0407         case SHMCTL:
0408             err = ksys_old_shmctl(first, (int)second | IPC_64, ptr);
0409             goto out;
0410         default:
0411             err = -ENOSYS;
0412             goto out;
0413         }
0414     } else {
0415         err = -ENOSYS;
0416     }
0417 out:
0418     return err;
0419 }
0420 
0421 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
0422 {
0423     long ret;
0424 
0425     if (personality(current->personality) == PER_LINUX32 &&
0426         personality(personality) == PER_LINUX)
0427         personality |= PER_LINUX32;
0428     ret = sys_personality(personality);
0429     if (personality(ret) == PER_LINUX32)
0430         ret &= ~PER_LINUX32;
0431 
0432     return ret;
0433 }
0434 
0435 int sparc_mmap_check(unsigned long addr, unsigned long len)
0436 {
0437     if (test_thread_flag(TIF_32BIT)) {
0438         if (len >= STACK_TOP32)
0439             return -EINVAL;
0440 
0441         if (addr > STACK_TOP32 - len)
0442             return -EINVAL;
0443     } else {
0444         if (len >= VA_EXCLUDE_START)
0445             return -EINVAL;
0446 
0447         if (invalid_64bit_range(addr, len))
0448             return -EINVAL;
0449     }
0450 
0451     return 0;
0452 }
0453 
0454 /* Linux version of mmap */
0455 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
0456         unsigned long, prot, unsigned long, flags, unsigned long, fd,
0457         unsigned long, off)
0458 {
0459     unsigned long retval = -EINVAL;
0460 
0461     if ((off + PAGE_ALIGN(len)) < off)
0462         goto out;
0463     if (off & ~PAGE_MASK)
0464         goto out;
0465     retval = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
0466 out:
0467     return retval;
0468 }
0469 
0470 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
0471 {
0472     if (invalid_64bit_range(addr, len))
0473         return -EINVAL;
0474 
0475     return vm_munmap(addr, len);
0476 }
0477                 
0478 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
0479         unsigned long, new_len, unsigned long, flags,
0480         unsigned long, new_addr)
0481 {
0482     if (test_thread_flag(TIF_32BIT))
0483         return -EINVAL;
0484     return sys_mremap(addr, old_len, new_len, flags, new_addr);
0485 }
0486 
0487 SYSCALL_DEFINE0(nis_syscall)
0488 {
0489     static int count;
0490     struct pt_regs *regs = current_pt_regs();
0491     
0492     /* Don't make the system unusable, if someone goes stuck */
0493     if (count++ > 5)
0494         return -ENOSYS;
0495 
0496     printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
0497 #ifdef DEBUG_UNIMP_SYSCALL  
0498     show_regs (regs);
0499 #endif
0500 
0501     return -ENOSYS;
0502 }
0503 
0504 /* #define DEBUG_SPARC_BREAKPOINT */
0505 
0506 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
0507 {
0508     enum ctx_state prev_state = exception_enter();
0509 
0510     if (test_thread_flag(TIF_32BIT)) {
0511         regs->tpc &= 0xffffffff;
0512         regs->tnpc &= 0xffffffff;
0513     }
0514 #ifdef DEBUG_SPARC_BREAKPOINT
0515         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
0516 #endif
0517     force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc);
0518 #ifdef DEBUG_SPARC_BREAKPOINT
0519     printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
0520 #endif
0521     exception_exit(prev_state);
0522 }
0523 
0524 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
0525 {
0526     int nlen, err;
0527     char tmp[__NEW_UTS_LEN + 1];
0528 
0529     if (len < 0)
0530         return -EINVAL;
0531 
0532     down_read(&uts_sem);
0533 
0534     nlen = strlen(utsname()->domainname) + 1;
0535     err = -EINVAL;
0536     if (nlen > len)
0537         goto out_unlock;
0538     memcpy(tmp, utsname()->domainname, nlen);
0539 
0540     up_read(&uts_sem);
0541 
0542     if (copy_to_user(name, tmp, nlen))
0543         return -EFAULT;
0544     return 0;
0545 
0546 out_unlock:
0547     up_read(&uts_sem);
0548     return err;
0549 }
0550 
0551 SYSCALL_DEFINE1(sparc_adjtimex, struct __kernel_timex __user *, txc_p)
0552 {
0553     struct __kernel_timex txc;
0554     struct __kernel_old_timeval *tv = (void *)&txc.time;
0555     int ret;
0556 
0557     /* Copy the user data space into the kernel copy
0558      * structure. But bear in mind that the structures
0559      * may change
0560      */
0561     if (copy_from_user(&txc, txc_p, sizeof(txc)))
0562         return -EFAULT;
0563 
0564     /*
0565      * override for sparc64 specific timeval type: tv_usec
0566      * is 32 bit wide instead of 64-bit in __kernel_timex
0567      */
0568     txc.time.tv_usec = tv->tv_usec;
0569     ret = do_adjtimex(&txc);
0570     tv->tv_usec = txc.time.tv_usec;
0571 
0572     return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret;
0573 }
0574 
0575 SYSCALL_DEFINE2(sparc_clock_adjtime, const clockid_t, which_clock,
0576         struct __kernel_timex __user *, txc_p)
0577 {
0578     struct __kernel_timex txc;
0579     struct __kernel_old_timeval *tv = (void *)&txc.time;
0580     int ret;
0581 
0582     if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) {
0583         pr_err_once("process %d (%s) attempted a POSIX timer syscall "
0584             "while CONFIG_POSIX_TIMERS is not set\n",
0585             current->pid, current->comm);
0586 
0587         return -ENOSYS;
0588     }
0589 
0590     /* Copy the user data space into the kernel copy
0591      * structure. But bear in mind that the structures
0592      * may change
0593      */
0594     if (copy_from_user(&txc, txc_p, sizeof(txc)))
0595         return -EFAULT;
0596 
0597     /*
0598      * override for sparc64 specific timeval type: tv_usec
0599      * is 32 bit wide instead of 64-bit in __kernel_timex
0600      */
0601     txc.time.tv_usec = tv->tv_usec;
0602     ret = do_clock_adjtime(which_clock, &txc);
0603     tv->tv_usec = txc.time.tv_usec;
0604 
0605     return copy_to_user(txc_p, &txc, sizeof(txc)) ? -EFAULT : ret;
0606 }
0607 
0608 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
0609         utrap_handler_t, new_p, utrap_handler_t, new_d,
0610         utrap_handler_t __user *, old_p,
0611         utrap_handler_t __user *, old_d)
0612 {
0613     if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
0614         return -EINVAL;
0615     if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
0616         if (old_p) {
0617             if (!current_thread_info()->utraps) {
0618                 if (put_user(NULL, old_p))
0619                     return -EFAULT;
0620             } else {
0621                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
0622                     return -EFAULT;
0623             }
0624         }
0625         if (old_d) {
0626             if (put_user(NULL, old_d))
0627                 return -EFAULT;
0628         }
0629         return 0;
0630     }
0631     if (!current_thread_info()->utraps) {
0632         current_thread_info()->utraps =
0633             kcalloc(UT_TRAP_INSTRUCTION_31 + 1, sizeof(long),
0634                 GFP_KERNEL);
0635         if (!current_thread_info()->utraps)
0636             return -ENOMEM;
0637         current_thread_info()->utraps[0] = 1;
0638     } else {
0639         if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
0640             current_thread_info()->utraps[0] > 1) {
0641             unsigned long *p = current_thread_info()->utraps;
0642 
0643             current_thread_info()->utraps =
0644                 kmalloc_array(UT_TRAP_INSTRUCTION_31 + 1,
0645                           sizeof(long),
0646                           GFP_KERNEL);
0647             if (!current_thread_info()->utraps) {
0648                 current_thread_info()->utraps = p;
0649                 return -ENOMEM;
0650             }
0651             p[0]--;
0652             current_thread_info()->utraps[0] = 1;
0653             memcpy(current_thread_info()->utraps+1, p+1,
0654                    UT_TRAP_INSTRUCTION_31*sizeof(long));
0655         }
0656     }
0657     if (old_p) {
0658         if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
0659             return -EFAULT;
0660     }
0661     if (old_d) {
0662         if (put_user(NULL, old_d))
0663             return -EFAULT;
0664     }
0665     current_thread_info()->utraps[type] = (long)new_p;
0666 
0667     return 0;
0668 }
0669 
0670 SYSCALL_DEFINE1(memory_ordering, unsigned long, model)
0671 {
0672     struct pt_regs *regs = current_pt_regs();
0673     if (model >= 3)
0674         return -EINVAL;
0675     regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
0676     return 0;
0677 }
0678 
0679 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
0680         struct sigaction __user *, oact, void __user *, restorer,
0681         size_t, sigsetsize)
0682 {
0683     struct k_sigaction new_ka, old_ka;
0684     int ret;
0685 
0686     /* XXX: Don't preclude handling different sized sigset_t's.  */
0687     if (sigsetsize != sizeof(sigset_t))
0688         return -EINVAL;
0689 
0690     if (act) {
0691         new_ka.ka_restorer = restorer;
0692         if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
0693             return -EFAULT;
0694     }
0695 
0696     ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
0697 
0698     if (!ret && oact) {
0699         if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
0700             return -EFAULT;
0701     }
0702 
0703     return ret;
0704 }
0705 
0706 SYSCALL_DEFINE0(kern_features)
0707 {
0708     return KERN_FEATURE_MIXED_MODE_STACK;
0709 }
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