1 files changed, 473 insertions, 0 deletions
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
new file mode 100644
index 000000000..40f881f72
--- /dev/null
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -0,0 +1,473 @@
+// 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>
+
+/* we construct an artificial offset for the mapping based on the physical
+ * address of the kernel mapping variable */
+#define GET_LAST_MMAP(filp)		\
+	(filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL)
+#define SET_LAST_MMAP(filp, val)	\
+	 { /* nothing */ }
+
+static int get_offset(unsigned int last_mmap)
+{
+	return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT;
+}
+
+static unsigned long shared_align_offset(unsigned int last_mmap,
+					 unsigned long pgoff)
+{
+	return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT;
+}
+
+static inline unsigned long COLOR_ALIGN(unsigned long addr,
+			 unsigned int last_mmap, unsigned long pgoff)
+{
+	unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
+	unsigned long off  = (SHM_COLOUR-1) &
+		(shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT);
+
+	return base + off;
+}
+
+/*
+ * 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().
+ */
+static unsigned long mmap_upper_limit(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);
+	if (stack_base > STACK_SIZE_MAX)
+		stack_base = STACK_SIZE_MAX;
+
+	/* Add space for stack randomization. */
+	if (current->flags & PF_RANDOMIZE)
+		stack_base += (STACK_RND_MASK << PAGE_SHIFT);
+
+	return PAGE_ALIGN(STACK_TOP - stack_base);
+}
+
+
+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, *prev;
+	unsigned long task_size = TASK_SIZE;
+	int do_color_align, last_mmap;
+	struct vm_unmapped_area_info info;
+
+	if (len > task_size)
+		return -ENOMEM;
+
+	do_color_align = 0;
+	if (filp || (flags & MAP_SHARED))
+		do_color_align = 1;
+	last_mmap = GET_LAST_MMAP(filp);
+
+	if (flags & MAP_FIXED) {
+		if ((flags & MAP_SHARED) && last_mmap &&
+		    (addr - shared_align_offset(last_mmap, pgoff))
+				& (SHM_COLOUR - 1))
+			return -EINVAL;
+		goto found_addr;
+	}
+
+	if (addr) {
+		if (do_color_align && last_mmap)
+			addr = COLOR_ALIGN(addr, last_mmap, 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)))
+			goto found_addr;
+	}
+
+	info.flags = 0;
+	info.length = len;
+	info.low_limit = mm->mmap_legacy_base;
+	info.high_limit = mmap_upper_limit(NULL);
+	info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
+	info.align_offset = shared_align_offset(last_mmap, pgoff);
+	addr = vm_unmapped_area(&info);
+
+found_addr:
+	if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
+		SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
+
+	return addr;
+}
+
+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, *prev;
+	struct mm_struct *mm = current->mm;
+	unsigned long addr = addr0;
+	int do_color_align, last_mmap;
+	struct vm_unmapped_area_info info;
+
+	/* requested length too big for entire address space */
+	if (len > TASK_SIZE)
+		return -ENOMEM;
+
+	do_color_align = 0;
+	if (filp || (flags & MAP_SHARED))
+		do_color_align = 1;
+	last_mmap = GET_LAST_MMAP(filp);
+
+	if (flags & MAP_FIXED) {
+		if ((flags & MAP_SHARED) && last_mmap &&
+		    (addr - shared_align_offset(last_mmap, pgoff))
+			& (SHM_COLOUR - 1))
+			return -EINVAL;
+		goto found_addr;
+	}
+
+	/* requesting a specific address */
+	if (addr) {
+		if (do_color_align && last_mmap)
+			addr = COLOR_ALIGN(addr, last_mmap, 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)))
+			goto found_addr;
+	}
+
+	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
+	info.length = len;
+	info.low_limit = PAGE_SIZE;
+	info.high_limit = mm->mmap_base;
+	info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
+	info.align_offset = shared_align_offset(last_mmap, pgoff);
+	addr = vm_unmapped_area(&info);
+	if (!(addr & ~PAGE_MASK))
+		goto found_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.
+	 */
+	return arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
+
+found_addr:
+	if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
+		SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
+
+	return addr;
+}
+
+static int mmap_is_legacy(void)
+{
+	if (current->personality & ADDR_COMPAT_LAYOUT)
+		return 1;
+
+	/* parisc stack always grows up - so a unlimited stack should
+	 * not be an indicator to use the legacy memory layout.
+	 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
+	 *	return 1;
+	 */
+
+	return sysctl_legacy_va_layout;
+}
+
+static unsigned long mmap_rnd(void)
+{
+	unsigned long rnd = 0;
+
+	if (current->flags & PF_RANDOMIZE)
+		rnd = get_random_int() & MMAP_RND_MASK;
+
+	return rnd << PAGE_SHIFT;
+}
+
+unsigned long arch_mmap_rnd(void)
+{
+	return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT;
+}
+
+static unsigned long mmap_legacy_base(void)
+{
+	return TASK_UNMAPPED_BASE + mmap_rnd();
+}
+
+/*
+ * This function, called very early during the creation of a new
+ * process VM image, sets up which VM layout function to use:
+ */
+void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
+{
+	mm->mmap_legacy_base = mmap_legacy_base();
+	mm->mmap_base = mmap_upper_limit(rlim_stack);
+
+	if (mmap_is_legacy()) {
+		mm->mmap_base = mm->mmap_legacy_base;
+		mm->get_unmapped_area = arch_get_unmapped_area;
+	} else {
+		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+	}
+}
+
+
+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_64BIT
+asmlinkage 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);
+}
+
+/* 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);
+}
+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);
+}
+
+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) {
+		struct task_struct *tsk = current;
+		pr_warn_once("%s(%d) uses a deprecated O_NONBLOCK value.\n",
+			tsk->comm, tsk->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_COMPAT
+asmlinkage 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;
+	}
+
+	return sys_madvise(start, len_in, behavior);
+}