// SPDX-License-Identifier: GPL-2.0-or-later /* *    PARISC specific syscalls * *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> *    Copyright (C) 1999-2020 Helge Deller <deller@gmx.de> */ #include <linux/uaccess.h>#include <asm/elf.h>#include <linux/file.h>#include <linux/fs.h>#include <linux/linkage.h>#include <linux/mm.h>#include <linux/mman.h>#include <linux/sched/signal.h>#include <linux/sched/mm.h>#include <linux/shm.h>#include <linux/syscalls.h>#include <linux/utsname.h>#include <linux/personality.h>#include <linux/random.h>#include <linux/compat.h>#include <linux/elf-randomize.h> /* * Construct an artificial page offset for the mapping based on the physical * address of the kernel file mapping variable. */#define GET_FILP_PGOFF(filp)		\	(filp ? (((unsigned long) filp->f_mapping) >> 8)	\		 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL) static unsigned long shared_align_offset(unsigned long filp_pgoff,					 unsigned long pgoff){	return (filp_pgoff + pgoff) << PAGE_SHIFT;} static inline unsigned long COLOR_ALIGN(unsigned long addr,			 unsigned long filp_pgoff, unsigned long pgoff){	unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);	unsigned long off  = (SHM_COLOUR-1) &		shared_align_offset(filp_pgoff, pgoff);	return base + off;}  #ifdef CONFIG_COMPAT#define STACK_SIZE_DEFAULT (USER_WIDE_MODE			\			? (1 << 30)	/* 1 GB */		\			: (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024))#else#define STACK_SIZE_DEFAULT (1 << 30)#endif unsigned long calc_max_stack_size(unsigned long stack_max){#ifdef CONFIG_COMPAT	if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY))		stack_max = STACK_SIZE_DEFAULT;	else#endif	if (stack_max == RLIM_INFINITY)		stack_max = STACK_SIZE_DEFAULT; 	return stack_max;}  /* * Top of mmap area (just below the process stack). */ /* * When called from arch_get_unmapped_area(), rlim_stack will be NULL, * indicating that "current" should be used instead of a passed-in * value from the exec bprm as done with arch_pick_mmap_layout(). */unsigned long mmap_upper_limit(const struct rlimit *rlim_stack){	unsigned long stack_base; 	/* Limit stack size - see setup_arg_pages() in fs/exec.c */	stack_base = rlim_stack ? rlim_stack->rlim_max				: rlimit_max(RLIMIT_STACK); 	stack_base = calc_max_stack_size(stack_base); 	/* Add space for stack randomization. */	if (current->flags & PF_RANDOMIZE)		stack_base += (STACK_RND_MASK << PAGE_SHIFT); 	return PAGE_ALIGN(STACK_TOP - stack_base);} enum mmap_allocation_direction {UP, DOWN}; static unsigned long arch_get_unmapped_area_common(struct file *filp,	unsigned long addr, unsigned long len, unsigned long pgoff,	unsigned long flags, enum mmap_allocation_direction dir){	struct mm_struct *mm = current->mm;	struct vm_area_struct *vma, *prev;	unsigned long filp_pgoff;	int do_color_align;	struct vm_unmapped_area_info info = {		.length = len	}; 	if (unlikely(len > TASK_SIZE))		return -ENOMEM; 	do_color_align = 0;	if (filp || (flags & MAP_SHARED))		do_color_align = 1;	filp_pgoff = GET_FILP_PGOFF(filp); 	if (flags & MAP_FIXED) {		/* Even MAP_FIXED mappings must reside within TASK_SIZE */		if (TASK_SIZE - len < addr)			return -EINVAL; 		if ((flags & MAP_SHARED) && filp &&		    (addr - shared_align_offset(filp_pgoff, pgoff))				& (SHM_COLOUR - 1))			return -EINVAL;		return addr;	} 	if (addr) {		if (do_color_align)			addr = COLOR_ALIGN(addr, filp_pgoff, pgoff);		else			addr = PAGE_ALIGN(addr); 		vma = find_vma_prev(mm, addr, &prev);		if (TASK_SIZE - len >= addr &&		    (!vma || addr + len <= vm_start_gap(vma)) &&		    (!prev || addr >= vm_end_gap(prev)))			return addr;	} 	info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;	info.align_offset = shared_align_offset(filp_pgoff, pgoff); 	if (dir == DOWN) {		info.flags = VM_UNMAPPED_AREA_TOPDOWN;		info.low_limit = PAGE_SIZE;		info.high_limit = mm->mmap_base;		addr = vm_unmapped_area(&info);		if (!(addr & ~PAGE_MASK))			return addr;		VM_BUG_ON(addr != -ENOMEM); 		/*		 * 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.		 */	} 	info.low_limit = mm->mmap_base;	info.high_limit = mmap_upper_limit(NULL);	return vm_unmapped_area(&info);} unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,	unsigned long len, unsigned long pgoff, unsigned long flags,	vm_flags_t vm_flags){	return arch_get_unmapped_area_common(filp,			addr, len, pgoff, flags, UP);} unsigned long arch_get_unmapped_area_topdown(struct file *filp,	unsigned long addr, unsigned long len, unsigned long pgoff,	unsigned long flags, vm_flags_t vm_flags){	return arch_get_unmapped_area_common(filp,			addr, len, pgoff, flags, DOWN);} 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 ksys_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 offset){	if (!(offset & ~PAGE_MASK)) {		return ksys_mmap_pgoff(addr, len, prot, flags, fd,					offset >> PAGE_SHIFT);	} else {		return -EINVAL;	}} /* Fucking broken ABI */ #ifdef CONFIG_64BITasmlinkage long parisc_truncate64(const char __user * path,					unsigned int high, unsigned int low){	return ksys_truncate(path, (long)high << 32 | low);} asmlinkage long parisc_ftruncate64(unsigned int fd,					unsigned int high, unsigned int low){	return ksys_ftruncate(fd, (long)high << 32 | low, FTRUNCATE_LFS);} /* stubs for the benefit of the syscall_table since truncate64 and truncate  * are identical on LP64 */asmlinkage long sys_truncate64(const char __user * path, unsigned long length){	return ksys_truncate(path, length);}asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length){	return ksys_ftruncate(fd, length, FTRUNCATE_LFS);}asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg){	return sys_fcntl(fd, cmd, arg);}#else asmlinkage long parisc_truncate64(const char __user * path,					unsigned int high, unsigned int low){	return ksys_truncate(path, (loff_t)high << 32 | low);} asmlinkage long parisc_ftruncate64(unsigned int fd,					unsigned int high, unsigned int low){	return sys_ftruncate64(fd, (loff_t)high << 32 | low);}#endif asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,					unsigned int high, unsigned int low){	return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low);} asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,			size_t count, unsigned int high, unsigned int low){	return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);} asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,		                    size_t count){	return ksys_readahead(fd, (loff_t)high << 32 | low, count);} asmlinkage long parisc_fadvise64_64(int fd,			unsigned int high_off, unsigned int low_off,			unsigned int high_len, unsigned int low_len, int advice){	return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,			(loff_t)high_len << 32 | low_len, advice);} asmlinkage long parisc_sync_file_range(int fd,			u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,			unsigned int flags){	return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,			(loff_t)hi_nbytes << 32 | lo_nbytes, flags);} asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,				u32 lenhi, u32 lenlo){	return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,			      ((u64)lenhi << 32) | lenlo);} asmlinkage long parisc_personality(unsigned long personality){	long err; 	if (personality(current->personality) == PER_LINUX32	    && personality(personality) == PER_LINUX)		personality = (personality & ~PER_MASK) | PER_LINUX32; 	err = sys_personality(personality);	if (personality(err) == PER_LINUX32)		err = (err & ~PER_MASK) | PER_LINUX; 	return err;} /* * Up to kernel v5.9 we defined O_NONBLOCK as 000200004, * since then O_NONBLOCK is defined as 000200000. * * The following wrapper functions mask out the old * O_NDELAY bit from calls which use O_NONBLOCK. * * XXX: Remove those in year 2022 (or later)? */ #define O_NONBLOCK_OLD		000200004#define O_NONBLOCK_MASK_OUT	(O_NONBLOCK_OLD & ~O_NONBLOCK) static int FIX_O_NONBLOCK(int flags){	if ((flags & O_NONBLOCK_MASK_OUT) &&			!test_thread_flag(TIF_NONBLOCK_WARNING)) {		set_thread_flag(TIF_NONBLOCK_WARNING);		pr_warn("%s(%d) uses a deprecated O_NONBLOCK value."			" Please recompile with newer glibc.\n",			current->comm, current->pid);	}	return flags & ~O_NONBLOCK_MASK_OUT;} asmlinkage long parisc_timerfd_create(int clockid, int flags){	flags = FIX_O_NONBLOCK(flags);	return sys_timerfd_create(clockid, flags);} asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask,	size_t sizemask, int flags){	flags = FIX_O_NONBLOCK(flags);	return sys_signalfd4(ufd, user_mask, sizemask, flags);} #ifdef CONFIG_COMPATasmlinkage long parisc_compat_signalfd4(int ufd,	compat_sigset_t __user *user_mask,	compat_size_t sizemask, int flags){	flags = FIX_O_NONBLOCK(flags);	return compat_sys_signalfd4(ufd, user_mask, sizemask, flags);}#endif asmlinkage long parisc_eventfd2(unsigned int count, int flags){	flags = FIX_O_NONBLOCK(flags);	return sys_eventfd2(count, flags);} asmlinkage long parisc_userfaultfd(int flags){	flags = FIX_O_NONBLOCK(flags);	return sys_userfaultfd(flags);} asmlinkage long parisc_pipe2(int __user *fildes, int flags){	flags = FIX_O_NONBLOCK(flags);	return sys_pipe2(fildes, flags);} asmlinkage long parisc_inotify_init1(int flags){	flags = FIX_O_NONBLOCK(flags);	return sys_inotify_init1(flags);} /* * madvise() wrapper * * Up to kernel v6.1 parisc has different values than all other * platforms for the MADV_xxx flags listed below. * To keep binary compatibility with existing userspace programs * translate the former values to the new values. * * XXX: Remove this wrapper in year 2025 (or later) */ asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior){	switch (behavior) {	case 65: behavior = MADV_MERGEABLE;	break;	case 66: behavior = MADV_UNMERGEABLE;	break;	case 67: behavior = MADV_HUGEPAGE;	break;	case 68: behavior = MADV_NOHUGEPAGE;	break;	case 69: behavior = MADV_DONTDUMP;	break;	case 70: behavior = MADV_DODUMP;	break;	case 71: behavior = MADV_WIPEONFORK;	break;	case 72: behavior = MADV_KEEPONFORK;	break;	case 73: behavior = MADV_COLLAPSE;	break;	} 	return sys_madvise(start, len_in, behavior);}