| /* linux/arch/sparc/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.h> |
| #include <linux/mm.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/sem.h> |
| #include <linux/msg.h> |
| #include <linux/shm.h> |
| #include <linux/stat.h> |
| #include <linux/syscalls.h> |
| #include <linux/mman.h> |
| #include <linux/utsname.h> |
| #include <linux/smp.h> |
| #include <linux/ipc.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/unistd.h> |
| |
| /* #define DEBUG_UNIMP_SYSCALL */ |
| |
| /* XXX Make this per-binary type, this way we can detect the type of |
| * XXX a binary. Every Sparc executable calls this very early on. |
| */ |
| asmlinkage unsigned long sys_getpagesize(void) |
| { |
| return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ |
| } |
| |
| #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) |
| |
| unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) |
| { |
| struct vm_area_struct * vmm; |
| |
| 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; |
| } |
| |
| /* See asm-sparc/uaccess.h */ |
| if (len > TASK_SIZE - PAGE_SIZE) |
| return -ENOMEM; |
| if (!addr) |
| addr = TASK_UNMAPPED_BASE; |
| |
| if (flags & MAP_SHARED) |
| addr = COLOUR_ALIGN(addr); |
| else |
| addr = PAGE_ALIGN(addr); |
| |
| for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { |
| /* At this point: (!vmm || addr < vmm->vm_end). */ |
| if (TASK_SIZE - PAGE_SIZE - len < addr) |
| return -ENOMEM; |
| if (!vmm || addr + len <= vmm->vm_start) |
| return addr; |
| addr = vmm->vm_end; |
| if (flags & MAP_SHARED) |
| addr = COLOUR_ALIGN(addr); |
| } |
| } |
| |
| /* |
| * sys_pipe() is the normal C calling standard for creating |
| * a pipe. It's not the way unix traditionally does this, though. |
| */ |
| asmlinkage int sparc_pipe(struct pt_regs *regs) |
| { |
| int fd[2]; |
| int error; |
| |
| error = do_pipe_flags(fd, 0); |
| if (error) |
| goto out; |
| regs->u_regs[UREG_I1] = fd[1]; |
| error = fd[0]; |
| out: |
| return error; |
| } |
| |
| int sparc_mmap_check(unsigned long addr, unsigned long len) |
| { |
| /* See asm-sparc/uaccess.h */ |
| if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| /* Linux version of mmap */ |
| |
| asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, |
| unsigned long prot, unsigned long flags, unsigned long fd, |
| unsigned long pgoff) |
| { |
| /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE |
| we have. */ |
| return sys_mmap_pgoff(addr, len, prot, flags, fd, |
| pgoff >> (PAGE_SHIFT - 12)); |
| } |
| |
| asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, |
| unsigned long prot, unsigned long flags, unsigned long fd, |
| unsigned long off) |
| { |
| /* no alignment check? */ |
| return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
| } |
| |
| long sparc_remap_file_pages(unsigned long start, unsigned long size, |
| unsigned long prot, unsigned long pgoff, |
| unsigned long flags) |
| { |
| /* This works on an existing mmap so we don't need to validate |
| * the range as that was done at the original mmap call. |
| */ |
| return sys_remap_file_pages(start, size, prot, |
| (pgoff >> (PAGE_SHIFT - 12)), flags); |
| } |
| |
| /* we come to here via sys_nis_syscall so it can setup the regs argument */ |
| asmlinkage unsigned long |
| c_sys_nis_syscall (struct pt_regs *regs) |
| { |
| static int count = 0; |
| |
| if (count++ > 5) |
| return -ENOSYS; |
| printk ("%s[%d]: Unimplemented SPARC system call %d\n", |
| current->comm, task_pid_nr(current), (int)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) |
| { |
| siginfo_t info; |
| |
| #ifdef DEBUG_SPARC_BREAKPOINT |
| printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); |
| #endif |
| info.si_signo = SIGTRAP; |
| info.si_errno = 0; |
| info.si_code = TRAP_BRKPT; |
| info.si_addr = (void __user *)regs->pc; |
| info.si_trapno = 0; |
| force_sig_info(SIGTRAP, &info, current); |
| |
| #ifdef DEBUG_SPARC_BREAKPOINT |
| printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); |
| #endif |
| } |
| |
| asmlinkage int |
| sparc_sigaction (int sig, const struct old_sigaction __user *act, |
| struct old_sigaction __user *oact) |
| { |
| struct k_sigaction new_ka, old_ka; |
| int ret; |
| |
| WARN_ON_ONCE(sig >= 0); |
| sig = -sig; |
| |
| if (act) { |
| unsigned long mask; |
| |
| if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| return -EFAULT; |
| __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| __get_user(mask, &act->sa_mask); |
| siginitset(&new_ka.sa.sa_mask, mask); |
| new_ka.ka_restorer = NULL; |
| } |
| |
| ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| |
| if (!ret && oact) { |
| /* In the clone() case we could copy half consistent |
| * state to the user, however this could sleep and |
| * deadlock us if we held the signal lock on SMP. So for |
| * now I take the easy way out and do no locking. |
| */ |
| if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| return -EFAULT; |
| __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| } |
| |
| return ret; |
| } |
| |
| asmlinkage long |
| sys_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; |
| } |
| |
| asmlinkage int sys_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; |
| } |
| |
| /* |
| * Do a system call from kernel instead of calling sys_execve so we |
| * end up with proper pt_regs. |
| */ |
| int kernel_execve(const char *filename, |
| const char *const argv[], |
| const char *const envp[]) |
| { |
| long __res; |
| register long __g1 __asm__ ("g1") = __NR_execve; |
| register long __o0 __asm__ ("o0") = (long)(filename); |
| register long __o1 __asm__ ("o1") = (long)(argv); |
| register long __o2 __asm__ ("o2") = (long)(envp); |
| asm volatile ("t 0x10\n\t" |
| "bcc 1f\n\t" |
| "mov %%o0, %0\n\t" |
| "sub %%g0, %%o0, %0\n\t" |
| "1:\n\t" |
| : "=r" (__res), "=&r" (__o0) |
| : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) |
| : "cc"); |
| return __res; |
| } |