/* $Id: sys_sparc.c,v 1.57 2002/02/09 19:49:30 davem Exp $ * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* #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<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(fd); 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 *) fifth); goto out; case SEMGET: err = sys_semget(first, (int)second, (int)third); goto out; case SEMCTL: { err = sys_semctl(first, third, (int)second | 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 sparc64_mmap_check(unsigned long addr, unsigned long len, unsigned long flags) { if (test_thread_flag(TIF_32BIT)) { if (len >= STACK_TOP32) return -EINVAL; if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len) return -EINVAL; } else { if (len >= VA_EXCLUDE_START) return -EINVAL; if ((flags & MAP_FIXED) && 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) { struct vm_area_struct *vma; unsigned long ret = -EINVAL; if (test_thread_flag(TIF_32BIT)) goto out; if (unlikely(new_len >= VA_EXCLUDE_START)) goto out; if (unlikely(invalid_64bit_range(addr, old_len))) goto out; down_write(¤t->mm->mmap_sem); if (flags & MREMAP_FIXED) { if (invalid_64bit_range(new_addr, new_len)) goto out_sem; } else if (invalid_64bit_range(addr, new_len)) { unsigned long map_flags = 0; struct file *file = NULL; ret = -ENOMEM; if (!(flags & MREMAP_MAYMOVE)) goto out_sem; vma = find_vma(current->mm, addr); if (vma) { if (vma->vm_flags & VM_SHARED) map_flags |= MAP_SHARED; file = vma->vm_file; } /* MREMAP_FIXED checked above. */ new_addr = get_unmapped_area(file, addr, new_len, vma ? vma->vm_pgoff : 0, map_flags); ret = new_addr; if (new_addr & ~PAGE_MASK) goto out_sem; flags |= MREMAP_FIXED; } ret = do_mremap(addr, old_len, new_len, flags, new_addr); out_sem: 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 solaris_syscall(struct pt_regs *regs) { static int count; regs->tpc = regs->tnpc; regs->tnpc += 4; if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } if (++count <= 5) { printk ("For Solaris binary emulation you need solaris module loaded\n"); show_regs (regs); } send_sig(SIGSEGV, current, 1); return -ENOSYS; } #ifndef CONFIG_SUNOS_EMUL asmlinkage long sunos_syscall(struct pt_regs *regs) { static int count; regs->tpc = regs->tnpc; regs->tnpc += 4; if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } if (++count <= 20) printk ("SunOS binary emulation not compiled in\n"); force_sig(SIGSEGV, current); return -ENOSYS; } #endif 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) { 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; } 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; }