diff options
Diffstat (limited to 'arch/sparc/kernel/sys_sparc_64.c')
| -rw-r--r-- | arch/sparc/kernel/sys_sparc_64.c | 914 |
1 files changed, 914 insertions, 0 deletions
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c new file mode 100644 index 00000000000..39749e32dc7 --- /dev/null +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -0,0 +1,914 @@ +/* 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.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 <asm/uaccess.h> +#include <asm/utrap.h> +#include <asm/perfctr.h> +#include <asm/unistd.h> + +#include "entry.h" +#include "systbls.h" + +/* #define DEBUG_UNIMP_SYSCALL */ + +asmlinkage unsigned long sys_getpagesize(void) +{ + return PAGE_SIZE; +} + +#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL)) +#define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL)) + +/* 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; +} + +/* Does start,end straddle the VA-space hole? */ +static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end) +{ + unsigned long va_exclude_start, va_exclude_end; + + va_exclude_start = VA_EXCLUDE_START; + va_exclude_end = VA_EXCLUDE_END; + + if (likely(start < va_exclude_start && end < va_exclude_start)) + return 0; + + if (likely(start >= va_exclude_end && end >= va_exclude_end)) + return 0; + + return 1; +} + +/* 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 COLOUR_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; +} + +static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr, + unsigned long pgoff) +{ + unsigned long base = addr & ~(SHMLBA-1); + unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1); + + if (base + off <= addr) + return base + off; + 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; + unsigned long start_addr; + int do_color_align; + + 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 = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + vma = find_vma(mm, addr); + if (task_size - len >= addr && + (!vma || addr + len <= vma->vm_start)) + return addr; + } + + if (len > mm->cached_hole_size) { + start_addr = addr = mm->free_area_cache; + } else { + start_addr = addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; + } + + task_size -= len; + +full_search: + if (do_color_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { + /* At this point: (!vma || addr < vma->vm_end). */ + if (addr < VA_EXCLUDE_START && + (addr + len) >= VA_EXCLUDE_START) { + addr = VA_EXCLUDE_END; + vma = find_vma(mm, VA_EXCLUDE_END); + } + if (unlikely(task_size < addr)) { + if (start_addr != TASK_UNMAPPED_BASE) { + start_addr = addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; + goto full_search; + } + return -ENOMEM; + } + if (likely(!vma || addr + len <= vma->vm_start)) { + /* + * Remember the place where we stopped the search: + */ + mm->free_area_cache = addr + len; + return addr; + } + if (addr + mm->cached_hole_size < vma->vm_start) + mm->cached_hole_size = vma->vm_start - addr; + + addr = vma->vm_end; + if (do_color_align) + addr = COLOUR_ALIGN(addr, pgoff); + } +} + +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; + + /* 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 = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + vma = find_vma(mm, addr); + if (task_size - len >= addr && + (!vma || addr + len <= vma->vm_start)) + return addr; + } + + /* check if free_area_cache is useful for us */ + if (len <= mm->cached_hole_size) { + mm->cached_hole_size = 0; + mm->free_area_cache = mm->mmap_base; + } + + /* either no address requested or can't fit in requested address hole */ + addr = mm->free_area_cache; + if (do_color_align) { + unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff); + + addr = base + len; + } + + /* make sure it can fit in the remaining address space */ + if (likely(addr > len)) { + vma = find_vma(mm, addr-len); + if (!vma || addr <= vma->vm_start) { + /* remember the address as a hint for next time */ + return (mm->free_area_cache = addr-len); + } + } + + if (unlikely(mm->mmap_base < len)) + goto bottomup; + + addr = mm->mmap_base-len; + if (do_color_align) + addr = COLOUR_ALIGN_DOWN(addr, pgoff); + + do { + /* + * Lookup failure means no vma is above this address, + * else if new region fits below vma->vm_start, + * return with success: + */ + vma = find_vma(mm, addr); + if (likely(!vma || addr+len <= vma->vm_start)) { + /* remember the address as a hint for next time */ + return (mm->free_area_cache = addr); + } + + /* remember the largest hole we saw so far */ + if (addr + mm->cached_hole_size < vma->vm_start) + mm->cached_hole_size = vma->vm_start - addr; + + /* try just below the current vma->vm_start */ + addr = vma->vm_start-len; + if (do_color_align) + addr = COLOUR_ALIGN_DOWN(addr, pgoff); + } while (likely(len < vma->vm_start)); + +bottomup: + /* + * 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. + */ + mm->cached_hole_size = ~0UL; + mm->free_area_cache = TASK_UNMAPPED_BASE; + addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags); + /* + * Restore the topdown base: + */ + mm->free_area_cache = mm->mmap_base; + mm->cached_hole_size = ~0UL; + + 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; + + if (flags & MAP_FIXED) { + /* Ok, don't mess with it. */ + return get_unmapped_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_unmapped_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_unmapped_area(NULL, orig_addr, len, pgoff, flags); + + return addr; +} + +/* Essentially the same as PowerPC... */ +void arch_pick_mmap_layout(struct mm_struct *mm) +{ + unsigned long random_factor = 0UL; + + if (current->flags & PF_RANDOMIZE) { + random_factor = get_random_int(); + if (test_thread_flag(TIF_32BIT)) + random_factor &= ((1 * 1024 * 1024) - 1); + else + random_factor = ((random_factor << PAGE_SHIFT) & + 0xffffffffUL); + } + + /* + * Fall back to the standard layout if the personality + * bit is set, or if the expected stack growth is unlimited: + */ + if (!test_thread_flag(TIF_32BIT) || + (current->personality & ADDR_COMPAT_LAYOUT) || + current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY || + sysctl_legacy_va_layout) { + mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; + mm->get_unmapped_area = arch_get_unmapped_area; + mm->unmap_area = arch_unmap_area; + } else { + /* We know it's 32-bit */ + unsigned long task_size = STACK_TOP32; + unsigned long gap; + + gap = current->signal->rlim[RLIMIT_STACK].rlim_cur; + 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; + mm->unmap_area = arch_unmap_area_topdown; + } +} + +asmlinkage unsigned long sparc_brk(unsigned long brk) +{ + /* People could try to be nasty and use ta 0x6d in 32bit programs */ + if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32) + return current->mm->brk; + + if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk))) + return current->mm->brk; + + return sys_brk(brk); +} + +/* + * sys_pipe() is the normal C calling standard for creating + * a pipe. It's not the way unix traditionally does this, though. + */ +asmlinkage long 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; +} + +/* + * sys_ipc() is the de-multiplexer for the SysV IPC calls.. + * + * This is really horribly ugly. + */ + +asmlinkage long sys_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 <= SEMCTL) { + switch (call) { + case SEMOP: + err = sys_semtimedop(first, ptr, + (unsigned)second, NULL); + goto out; + case SEMTIMEDOP: + err = sys_semtimedop(first, ptr, (unsigned)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, + (union semun) 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); + 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; +} + +asmlinkage long sparc64_newuname(struct new_utsname __user *name) +{ + int ret = sys_newuname(name); + + if (current->personality == PER_LINUX32 && !ret) { + ret = (copy_to_user(name->machine, "sparc\0\0", 8) + ? -EFAULT : 0); + } + return ret; +} + +asmlinkage long sparc64_personality(unsigned long personality) +{ + int ret; + + if (current->personality == PER_LINUX32 && + personality == PER_LINUX) + personality = PER_LINUX32; + ret = sys_personality(personality); + if (ret == PER_LINUX32) + ret = PER_LINUX; + + 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 */ +asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flags, unsigned long fd, + unsigned long off) +{ + struct file * file = NULL; + unsigned long retval = -EBADF; + + if (!(flags & MAP_ANONYMOUS)) { + file = fget(fd); + if (!file) + goto out; + } + flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); + len = PAGE_ALIGN(len); + + down_write(¤t->mm->mmap_sem); + retval = do_mmap(file, addr, len, prot, flags, off); + up_write(¤t->mm->mmap_sem); + + if (file) + fput(file); +out: + return retval; +} + +asmlinkage long sys64_munmap(unsigned long addr, size_t len) +{ + long ret; + + if (invalid_64bit_range(addr, len)) + return -EINVAL; + + down_write(¤t->mm->mmap_sem); + ret = do_munmap(current->mm, addr, len); + up_write(¤t->mm->mmap_sem); + return ret; +} + +extern unsigned long do_mremap(unsigned long addr, + unsigned long old_len, unsigned long new_len, + unsigned long flags, unsigned long new_addr); + +asmlinkage unsigned long sys64_mremap(unsigned long addr, + unsigned long old_len, unsigned long new_len, + unsigned long flags, unsigned long new_addr) +{ + unsigned long ret = -EINVAL; + + if (test_thread_flag(TIF_32BIT)) + goto out; + if (unlikely(new_len >= VA_EXCLUDE_START)) + goto out; + if (unlikely(sparc_mmap_check(addr, old_len))) + goto out; + if (unlikely(sparc_mmap_check(new_addr, new_len))) + goto out; + + down_write(¤t->mm->mmap_sem); + ret = do_mremap(addr, old_len, new_len, flags, new_addr); + up_write(¤t->mm->mmap_sem); +out: + return ret; +} + +/* 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; + + /* 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) +{ + siginfo_t info; + + 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 + info.si_signo = SIGTRAP; + info.si_errno = 0; + info.si_code = TRAP_BRKPT; + info.si_addr = (void __user *)regs->tpc; + info.si_trapno = 0; + force_sig_info(SIGTRAP, &info, current); +#ifdef DEBUG_SPARC_BREAKPOINT + printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); +#endif +} + +extern void check_pending(int signum); + +asmlinkage long 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; +} + +asmlinkage long sys_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((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; +} + +asmlinkage long sparc_memory_ordering(unsigned long model, + struct pt_regs *regs) +{ + if (model >= 3) + return -EINVAL; + regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14); + return 0; +} + +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; +} + +/* Invoked by rtrap code to update performance counters in + * user space. + */ +asmlinkage void update_perfctrs(void) +{ + unsigned long pic, tmp; + + read_pic(pic); + tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic); + __put_user(tmp, current_thread_info()->user_cntd0); + tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32)); + __put_user(tmp, current_thread_info()->user_cntd1); + reset_pic(); +} + +asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2) +{ + int err = 0; + + switch(opcode) { + case PERFCTR_ON: + current_thread_info()->pcr_reg = arg2; + current_thread_info()->user_cntd0 = (u64 __user *) arg0; + current_thread_info()->user_cntd1 = (u64 __user *) arg1; + current_thread_info()->kernel_cntd0 = + current_thread_info()->kernel_cntd1 = 0; + write_pcr(arg2); + reset_pic(); + set_thread_flag(TIF_PERFCTR); + break; + + case PERFCTR_OFF: + err = -EINVAL; + if (test_thread_flag(TIF_PERFCTR)) { + current_thread_info()->user_cntd0 = + current_thread_info()->user_cntd1 = NULL; + current_thread_info()->pcr_reg = 0; + write_pcr(0); + clear_thread_flag(TIF_PERFCTR); + err = 0; + } + break; + + case PERFCTR_READ: { + unsigned long pic, tmp; + + if (!test_thread_flag(TIF_PERFCTR)) { + err = -EINVAL; + break; + } + read_pic(pic); + tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic); + err |= __put_user(tmp, current_thread_info()->user_cntd0); + tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32)); + err |= __put_user(tmp, current_thread_info()->user_cntd1); + reset_pic(); + break; + } + + case PERFCTR_CLRPIC: + if (!test_thread_flag(TIF_PERFCTR)) { + err = -EINVAL; + break; + } + current_thread_info()->kernel_cntd0 = + current_thread_info()->kernel_cntd1 = 0; + reset_pic(); + break; + + case PERFCTR_SETPCR: { + u64 __user *user_pcr = (u64 __user *)arg0; + + if (!test_thread_flag(TIF_PERFCTR)) { + err = -EINVAL; + break; + } + err |= __get_user(current_thread_info()->pcr_reg, user_pcr); + write_pcr(current_thread_info()->pcr_reg); + current_thread_info()->kernel_cntd0 = + current_thread_info()->kernel_cntd1 = 0; + reset_pic(); + break; + } + + case PERFCTR_GETPCR: { + u64 __user *user_pcr = (u64 __user *)arg0; + + if (!test_thread_flag(TIF_PERFCTR)) { + err = -EINVAL; + break; + } + err |= __put_user(current_thread_info()->pcr_reg, user_pcr); + break; + } + + default: + err = -EINVAL; + break; + }; + 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, char *const argv[], 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 0x6d\n\t" + "sub %%g0, %%o0, %0\n\t" + "movcc %%xcc, %%o0, %0\n\t" + : "=r" (__res), "=&r" (__o0) + : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) + : "cc"); + return __res; +} |