diff options
Diffstat (limited to 'arch/sparc/kernel/sys_sparc_32.c')
-rw-r--r-- | arch/sparc/kernel/sys_sparc_32.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c new file mode 100644 index 0000000000..082a551897 --- /dev/null +++ b/arch/sparc/kernel/sys_sparc_32.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0 +/* 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/signal.h> +#include <linux/sched/mm.h> +#include <linux/sched/debug.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 <linux/uaccess.h> +#include <asm/unistd.h> + +#include "systbls.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. + */ +SYSCALL_DEFINE0(getpagesize) +{ + return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ +} + +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) +{ + 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; + } + + /* See asm-sparc/uaccess.h */ + if (len > TASK_SIZE - PAGE_SIZE) + return -ENOMEM; + if (!addr) + addr = TASK_UNMAPPED_BASE; + + info.flags = 0; + info.length = len; + info.low_limit = addr; + info.high_limit = TASK_SIZE; + info.align_mask = (flags & MAP_SHARED) ? + (PAGE_MASK & (SHMLBA - 1)) : 0; + info.align_offset = pgoff << PAGE_SHIFT; + return vm_unmapped_area(&info); +} + +/* + * 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; +} + +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 */ + +SYSCALL_DEFINE6(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 ksys_mmap_pgoff(addr, len, prot, flags, fd, + pgoff >> (PAGE_SHIFT - 12)); +} + +SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, unsigned long, fd, + unsigned long, off) +{ + /* no alignment check? */ + return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); +} + +SYSCALL_DEFINE5(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); +} + +SYSCALL_DEFINE0(nis_syscall) +{ + static int count = 0; + struct pt_regs *regs = current_pt_regs(); + + 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) +{ + +#ifdef DEBUG_SPARC_BREAKPOINT + printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); +#endif + force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc); + +#ifdef DEBUG_SPARC_BREAKPOINT + printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); +#endif +} + +SYSCALL_DEFINE3(sparc_sigaction, int, sig, + struct old_sigaction __user *,act, + struct old_sigaction __user *,oact) +{ + WARN_ON_ONCE(sig >= 0); + return sys_sigaction(-sig, act, oact); +} + +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_DEFINE2(getdomainname, char __user *, name, int, len) +{ + int nlen, err; + char tmp[__NEW_UTS_LEN + 1]; + + if (len < 0) + return -EINVAL; + + down_read(&uts_sem); + + nlen = strlen(utsname()->domainname) + 1; + err = -EINVAL; + if (nlen > len) + goto out_unlock; + memcpy(tmp, utsname()->domainname, nlen); + + up_read(&uts_sem); + + if (copy_to_user(name, tmp, nlen)) + return -EFAULT; + return 0; + +out_unlock: + up_read(&uts_sem); + return err; +} |