| // SPDX-License-Identifier: GPL-2.0 |
| /* linux/arch/sparc64/kernel/sys_sparc.c |
| * |
| * This file contains various random system calls that |
| * have a non-standard calling sequence on the Linux/sparc |
| * platform. |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/sched/signal.h> |
| #include <linux/sched/mm.h> |
| #include <linux/sched/debug.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/mm.h> |
| #include <linux/sem.h> |
| #include <linux/msg.h> |
| #include <linux/shm.h> |
| #include <linux/stat.h> |
| #include <linux/mman.h> |
| #include <linux/utsname.h> |
| #include <linux/smp.h> |
| #include <linux/slab.h> |
| #include <linux/syscalls.h> |
| #include <linux/ipc.h> |
| #include <linux/personality.h> |
| #include <linux/random.h> |
| #include <linux/export.h> |
| #include <linux/context_tracking.h> |
| |
| #include <linux/uaccess.h> |
| #include <asm/utrap.h> |
| #include <asm/unistd.h> |
| |
| #include "entry.h" |
| #include "kernel.h" |
| #include "systbls.h" |
| |
| /* #define DEBUG_UNIMP_SYSCALL */ |
| |
| SYSCALL_DEFINE0(getpagesize) |
| { |
| return PAGE_SIZE; |
| } |
| |
| /* Does addr --> addr+len fall within 4GB of the VA-space hole or |
| * overflow past the end of the 64-bit address space? |
| */ |
| static inline int invalid_64bit_range(unsigned long addr, unsigned long len) |
| { |
| unsigned long va_exclude_start, va_exclude_end; |
| |
| va_exclude_start = VA_EXCLUDE_START; |
| va_exclude_end = VA_EXCLUDE_END; |
| |
| if (unlikely(len >= va_exclude_start)) |
| return 1; |
| |
| if (unlikely((addr + len) < addr)) |
| return 1; |
| |
| if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) || |
| ((addr + len) >= va_exclude_start && |
| (addr + len) < va_exclude_end))) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* These functions differ from the default implementations in |
| * mm/mmap.c in two ways: |
| * |
| * 1) For file backed MAP_SHARED mmap()'s we D-cache color align, |
| * for fixed such mappings we just validate what the user gave us. |
| * 2) For 64-bit tasks we avoid mapping anything within 4GB of |
| * the spitfire/niagara VA-hole. |
| */ |
| |
| static inline unsigned long COLOR_ALIGN(unsigned long addr, |
| unsigned long pgoff) |
| { |
| unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1); |
| unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1); |
| |
| return base + off; |
| } |
| |
| unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) |
| { |
| struct mm_struct *mm = current->mm; |
| struct vm_area_struct * vma; |
| unsigned long task_size = TASK_SIZE; |
| int do_color_align; |
| struct vm_unmapped_area_info info; |
| |
| if (flags & MAP_FIXED) { |
| /* We do not accept a shared mapping if it would violate |
| * cache aliasing constraints. |
| */ |
| if ((flags & MAP_SHARED) && |
| ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) |
| return -EINVAL; |
| return addr; |
| } |
| |
| if (test_thread_flag(TIF_32BIT)) |
| task_size = STACK_TOP32; |
| if (unlikely(len > task_size || len >= VA_EXCLUDE_START)) |
| return -ENOMEM; |
| |
| do_color_align = 0; |
| if (filp || (flags & MAP_SHARED)) |
| do_color_align = 1; |
| |
| if (addr) { |
| if (do_color_align) |
| addr = COLOR_ALIGN(addr, pgoff); |
| else |
| addr = PAGE_ALIGN(addr); |
| |
| vma = find_vma(mm, addr); |
| if (task_size - len >= addr && |
| (!vma || addr + len <= vm_start_gap(vma))) |
| return addr; |
| } |
| |
| info.flags = 0; |
| info.length = len; |
| info.low_limit = TASK_UNMAPPED_BASE; |
| info.high_limit = min(task_size, VA_EXCLUDE_START); |
| info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; |
| info.align_offset = pgoff << PAGE_SHIFT; |
| addr = vm_unmapped_area(&info); |
| |
| if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) { |
| VM_BUG_ON(addr != -ENOMEM); |
| info.low_limit = VA_EXCLUDE_END; |
| info.high_limit = task_size; |
| addr = vm_unmapped_area(&info); |
| } |
| |
| return addr; |
| } |
| |
| unsigned long |
| arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, |
| const unsigned long len, const unsigned long pgoff, |
| const unsigned long flags) |
| { |
| struct vm_area_struct *vma; |
| struct mm_struct *mm = current->mm; |
| unsigned long task_size = STACK_TOP32; |
| unsigned long addr = addr0; |
| int do_color_align; |
| struct vm_unmapped_area_info info; |
| |
| /* This should only ever run for 32-bit processes. */ |
| BUG_ON(!test_thread_flag(TIF_32BIT)); |
| |
| if (flags & MAP_FIXED) { |
| /* We do not accept a shared mapping if it would violate |
| * cache aliasing constraints. |
| */ |
| if ((flags & MAP_SHARED) && |
| ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) |
| return -EINVAL; |
| return addr; |
| } |
| |
| if (unlikely(len > task_size)) |
| return -ENOMEM; |
| |
| do_color_align = 0; |
| if (filp || (flags & MAP_SHARED)) |
| do_color_align = 1; |
| |
| /* requesting a specific address */ |
| if (addr) { |
| if (do_color_align) |
| addr = COLOR_ALIGN(addr, pgoff); |
| else |
| addr = PAGE_ALIGN(addr); |
| |
| vma = find_vma(mm, addr); |
| if (task_size - len >= addr && |
| (!vma || addr + len <= vm_start_gap(vma))) |
| return addr; |
| } |
| |
| info.flags = VM_UNMAPPED_AREA_TOPDOWN; |
| info.length = len; |
| info.low_limit = PAGE_SIZE; |
| info.high_limit = mm->mmap_base; |
| info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; |
| info.align_offset = pgoff << PAGE_SHIFT; |
| addr = vm_unmapped_area(&info); |
| |
| /* |
| * A failed mmap() very likely causes application failure, |
| * so fall back to the bottom-up function here. This scenario |
| * can happen with large stack limits and large mmap() |
| * allocations. |
| */ |
| if (addr & ~PAGE_MASK) { |
| VM_BUG_ON(addr != -ENOMEM); |
| info.flags = 0; |
| info.low_limit = TASK_UNMAPPED_BASE; |
| info.high_limit = STACK_TOP32; |
| addr = vm_unmapped_area(&info); |
| } |
| |
| return addr; |
| } |
| |
| /* Try to align mapping such that we align it as much as possible. */ |
| unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags) |
| { |
| unsigned long align_goal, addr = -ENOMEM; |
| unsigned long (*get_area)(struct file *, unsigned long, |
| unsigned long, unsigned long, unsigned long); |
| |
| get_area = current->mm->get_unmapped_area; |
| |
| if (flags & MAP_FIXED) { |
| /* Ok, don't mess with it. */ |
| return get_area(NULL, orig_addr, len, pgoff, flags); |
| } |
| flags &= ~MAP_SHARED; |
| |
| align_goal = PAGE_SIZE; |
| if (len >= (4UL * 1024 * 1024)) |
| align_goal = (4UL * 1024 * 1024); |
| else if (len >= (512UL * 1024)) |
| align_goal = (512UL * 1024); |
| else if (len >= (64UL * 1024)) |
| align_goal = (64UL * 1024); |
| |
| do { |
| addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags); |
| if (!(addr & ~PAGE_MASK)) { |
| addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL); |
| break; |
| } |
| |
| if (align_goal == (4UL * 1024 * 1024)) |
| align_goal = (512UL * 1024); |
| else if (align_goal == (512UL * 1024)) |
| align_goal = (64UL * 1024); |
| else |
| align_goal = PAGE_SIZE; |
| } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE); |
| |
| /* Mapping is smaller than 64K or larger areas could not |
| * be obtained. |
| */ |
| if (addr & ~PAGE_MASK) |
| addr = get_area(NULL, orig_addr, len, pgoff, flags); |
| |
| return addr; |
| } |
| EXPORT_SYMBOL(get_fb_unmapped_area); |
| |
| /* Essentially the same as PowerPC. */ |
| static unsigned long mmap_rnd(void) |
| { |
| unsigned long rnd = 0UL; |
| |
| if (current->flags & PF_RANDOMIZE) { |
| unsigned long val = get_random_long(); |
| if (test_thread_flag(TIF_32BIT)) |
| rnd = (val % (1UL << (23UL-PAGE_SHIFT))); |
| else |
| rnd = (val % (1UL << (30UL-PAGE_SHIFT))); |
| } |
| return rnd << PAGE_SHIFT; |
| } |
| |
| void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) |
| { |
| unsigned long random_factor = mmap_rnd(); |
| unsigned long gap; |
| |
| /* |
| * Fall back to the standard layout if the personality |
| * bit is set, or if the expected stack growth is unlimited: |
| */ |
| gap = rlim_stack->rlim_cur; |
| if (!test_thread_flag(TIF_32BIT) || |
| (current->personality & ADDR_COMPAT_LAYOUT) || |
| gap == RLIM_INFINITY || |
| sysctl_legacy_va_layout) { |
| mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; |
| mm->get_unmapped_area = arch_get_unmapped_area; |
| } else { |
| /* We know it's 32-bit */ |
| unsigned long task_size = STACK_TOP32; |
| |
| if (gap < 128 * 1024 * 1024) |
| gap = 128 * 1024 * 1024; |
| if (gap > (task_size / 6 * 5)) |
| gap = (task_size / 6 * 5); |
| |
| mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor); |
| mm->get_unmapped_area = arch_get_unmapped_area_topdown; |
| } |
| } |
| |
| /* |
| * sys_pipe() is the normal C calling standard for creating |
| * a pipe. It's not the way unix traditionally does this, though. |
| */ |
| SYSCALL_DEFINE0(sparc_pipe) |
| { |
| int fd[2]; |
| int error; |
| |
| error = do_pipe_flags(fd, 0); |
| if (error) |
| goto out; |
| current_pt_regs()->u_regs[UREG_I1] = fd[1]; |
| error = fd[0]; |
| out: |
| return error; |
| } |
| |
| /* |
| * sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
| * |
| * This is really horribly ugly. |
| */ |
| |
| SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second, |
| unsigned long, third, void __user *, ptr, long, fifth) |
| { |
| long err; |
| |
| /* No need for backward compatibility. We can start fresh... */ |
| if (call <= SEMTIMEDOP) { |
| switch (call) { |
| case SEMOP: |
| err = sys_semtimedop(first, ptr, |
| (unsigned int)second, NULL); |
| goto out; |
| case SEMTIMEDOP: |
| err = sys_semtimedop(first, ptr, (unsigned int)second, |
| (const struct timespec __user *) |
| (unsigned long) fifth); |
| goto out; |
| case SEMGET: |
| err = sys_semget(first, (int)second, (int)third); |
| goto out; |
| case SEMCTL: { |
| err = sys_semctl(first, second, |
| (int)third | IPC_64, |
| (unsigned long) ptr); |
| goto out; |
| } |
| default: |
| err = -ENOSYS; |
| goto out; |
| } |
| } |
| if (call <= MSGCTL) { |
| switch (call) { |
| case MSGSND: |
| err = sys_msgsnd(first, ptr, (size_t)second, |
| (int)third); |
| goto out; |
| case MSGRCV: |
| err = sys_msgrcv(first, ptr, (size_t)second, fifth, |
| (int)third); |
| goto out; |
| case MSGGET: |
| err = sys_msgget((key_t)first, (int)second); |
| goto out; |
| case MSGCTL: |
| err = sys_msgctl(first, (int)second | IPC_64, ptr); |
| goto out; |
| default: |
| err = -ENOSYS; |
| goto out; |
| } |
| } |
| if (call <= SHMCTL) { |
| switch (call) { |
| case SHMAT: { |
| ulong raddr; |
| err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); |
| if (!err) { |
| if (put_user(raddr, |
| (ulong __user *) third)) |
| err = -EFAULT; |
| } |
| goto out; |
| } |
| case SHMDT: |
| err = sys_shmdt(ptr); |
| goto out; |
| case SHMGET: |
| err = sys_shmget(first, (size_t)second, (int)third); |
| goto out; |
| case SHMCTL: |
| err = sys_shmctl(first, (int)second | IPC_64, ptr); |
| goto out; |
| default: |
| err = -ENOSYS; |
| goto out; |
| } |
| } else { |
| err = -ENOSYS; |
| } |
| out: |
| return err; |
| } |
| |
| SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) |
| { |
| long ret; |
| |
| if (personality(current->personality) == PER_LINUX32 && |
| personality(personality) == PER_LINUX) |
| personality |= PER_LINUX32; |
| ret = sys_personality(personality); |
| if (personality(ret) == PER_LINUX32) |
| ret &= ~PER_LINUX32; |
| |
| return ret; |
| } |
| |
| int sparc_mmap_check(unsigned long addr, unsigned long len) |
| { |
| if (test_thread_flag(TIF_32BIT)) { |
| if (len >= STACK_TOP32) |
| return -EINVAL; |
| |
| if (addr > STACK_TOP32 - len) |
| return -EINVAL; |
| } else { |
| if (len >= VA_EXCLUDE_START) |
| return -EINVAL; |
| |
| if (invalid_64bit_range(addr, len)) |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* Linux version of mmap */ |
| SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, |
| unsigned long, prot, unsigned long, flags, unsigned long, fd, |
| unsigned long, off) |
| { |
| unsigned long retval = -EINVAL; |
| |
| if ((off + PAGE_ALIGN(len)) < off) |
| goto out; |
| if (off & ~PAGE_MASK) |
| goto out; |
| retval = ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
| out: |
| return retval; |
| } |
| |
| SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len) |
| { |
| if (invalid_64bit_range(addr, len)) |
| return -EINVAL; |
| |
| return vm_munmap(addr, len); |
| } |
| |
| SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len, |
| unsigned long, new_len, unsigned long, flags, |
| unsigned long, new_addr) |
| { |
| if (test_thread_flag(TIF_32BIT)) |
| return -EINVAL; |
| return sys_mremap(addr, old_len, new_len, flags, new_addr); |
| } |
| |
| SYSCALL_DEFINE0(nis_syscall) |
| { |
| static int count; |
| struct pt_regs *regs = current_pt_regs(); |
| |
| /* Don't make the system unusable, if someone goes stuck */ |
| if (count++ > 5) |
| return -ENOSYS; |
| |
| printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]); |
| #ifdef DEBUG_UNIMP_SYSCALL |
| show_regs (regs); |
| #endif |
| |
| return -ENOSYS; |
| } |
| |
| /* #define DEBUG_SPARC_BREAKPOINT */ |
| |
| asmlinkage void sparc_breakpoint(struct pt_regs *regs) |
| { |
| enum ctx_state prev_state = exception_enter(); |
| |
| if (test_thread_flag(TIF_32BIT)) { |
| regs->tpc &= 0xffffffff; |
| regs->tnpc &= 0xffffffff; |
| } |
| #ifdef DEBUG_SPARC_BREAKPOINT |
| printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc); |
| #endif |
| force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc, 0, current); |
| #ifdef DEBUG_SPARC_BREAKPOINT |
| printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); |
| #endif |
| exception_exit(prev_state); |
| } |
| |
| SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) |
| { |
| int nlen, err; |
| |
| if (len < 0) |
| return -EINVAL; |
| |
| down_read(&uts_sem); |
| |
| nlen = strlen(utsname()->domainname) + 1; |
| err = -EINVAL; |
| if (nlen > len) |
| goto out; |
| |
| err = -EFAULT; |
| if (!copy_to_user(name, utsname()->domainname, nlen)) |
| err = 0; |
| |
| out: |
| up_read(&uts_sem); |
| return err; |
| } |
| |
| SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type, |
| utrap_handler_t, new_p, utrap_handler_t, new_d, |
| utrap_handler_t __user *, old_p, |
| utrap_handler_t __user *, old_d) |
| { |
| if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31) |
| return -EINVAL; |
| if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) { |
| if (old_p) { |
| if (!current_thread_info()->utraps) { |
| if (put_user(NULL, old_p)) |
| return -EFAULT; |
| } else { |
| if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) |
| return -EFAULT; |
| } |
| } |
| if (old_d) { |
| if (put_user(NULL, old_d)) |
| return -EFAULT; |
| } |
| return 0; |
| } |
| if (!current_thread_info()->utraps) { |
| current_thread_info()->utraps = |
| kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL); |
| if (!current_thread_info()->utraps) |
| return -ENOMEM; |
| current_thread_info()->utraps[0] = 1; |
| } else { |
| if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p && |
| current_thread_info()->utraps[0] > 1) { |
| unsigned long *p = current_thread_info()->utraps; |
| |
| current_thread_info()->utraps = |
| kmalloc_array(UT_TRAP_INSTRUCTION_31 + 1, |
| sizeof(long), |
| GFP_KERNEL); |
| if (!current_thread_info()->utraps) { |
| current_thread_info()->utraps = p; |
| return -ENOMEM; |
| } |
| p[0]--; |
| current_thread_info()->utraps[0] = 1; |
| memcpy(current_thread_info()->utraps+1, p+1, |
| UT_TRAP_INSTRUCTION_31*sizeof(long)); |
| } |
| } |
| if (old_p) { |
| if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) |
| return -EFAULT; |
| } |
| if (old_d) { |
| if (put_user(NULL, old_d)) |
| return -EFAULT; |
| } |
| current_thread_info()->utraps[type] = (long)new_p; |
| |
| return 0; |
| } |
| |
| SYSCALL_DEFINE1(memory_ordering, unsigned long, model) |
| { |
| struct pt_regs *regs = current_pt_regs(); |
| if (model >= 3) |
| return -EINVAL; |
| regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14); |
| return 0; |
| } |
| |
| SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, |
| struct sigaction __user *, oact, void __user *, restorer, |
| size_t, sigsetsize) |
| { |
| struct k_sigaction new_ka, old_ka; |
| int ret; |
| |
| /* XXX: Don't preclude handling different sized sigset_t's. */ |
| if (sigsetsize != sizeof(sigset_t)) |
| return -EINVAL; |
| |
| if (act) { |
| new_ka.ka_restorer = restorer; |
| if (copy_from_user(&new_ka.sa, act, sizeof(*act))) |
| return -EFAULT; |
| } |
| |
| ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| |
| if (!ret && oact) { |
| if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) |
| return -EFAULT; |
| } |
| |
| return ret; |
| } |
| |
| SYSCALL_DEFINE0(kern_features) |
| { |
| return KERN_FEATURE_MIXED_MODE_STACK; |
| } |