sys_parisc.c (642073c306e66daca108cb630d169129e50a6ba3) sys_parisc.c (3033cd4307681c60db6d08f398a64484b36e0b0f)
1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/*
4 * PARISC specific syscalls
5 *
6 * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
7 * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
8 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>

--- 147 unchanged lines hidden (view full) ---

156 * A failed mmap() very likely causes application failure,
157 * so fall back to the bottom-up function here. This scenario
158 * can happen with large stack limits and large mmap()
159 * allocations.
160 */
161 }
162
163 info.flags = 0;
1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/*
4 * PARISC specific syscalls
5 *
6 * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
7 * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
8 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>

--- 147 unchanged lines hidden (view full) ---

156 * A failed mmap() very likely causes application failure,
157 * so fall back to the bottom-up function here. This scenario
158 * can happen with large stack limits and large mmap()
159 * allocations.
160 */
161 }
162
163 info.flags = 0;
164 info.low_limit = mm->mmap_legacy_base;
164 info.low_limit = mm->mmap_base;
165 info.high_limit = mmap_upper_limit(NULL);
166 return vm_unmapped_area(&info);
167}
168
169unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
170 unsigned long len, unsigned long pgoff, unsigned long flags)
171{
172 return arch_get_unmapped_area_common(filp,
173 addr, len, pgoff, flags, UP);
174}
175
176unsigned long arch_get_unmapped_area_topdown(struct file *filp,
177 unsigned long addr, unsigned long len, unsigned long pgoff,
178 unsigned long flags)
179{
180 return arch_get_unmapped_area_common(filp,
181 addr, len, pgoff, flags, DOWN);
182}
183
165 info.high_limit = mmap_upper_limit(NULL);
166 return vm_unmapped_area(&info);
167}
168
169unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
170 unsigned long len, unsigned long pgoff, unsigned long flags)
171{
172 return arch_get_unmapped_area_common(filp,
173 addr, len, pgoff, flags, UP);
174}
175
176unsigned long arch_get_unmapped_area_topdown(struct file *filp,
177 unsigned long addr, unsigned long len, unsigned long pgoff,
178 unsigned long flags)
179{
180 return arch_get_unmapped_area_common(filp,
181 addr, len, pgoff, flags, DOWN);
182}
183
184static int mmap_is_legacy(void)
185{
186 if (current->personality & ADDR_COMPAT_LAYOUT)
187 return 1;
188
189 /* parisc stack always grows up - so a unlimited stack should
190 * not be an indicator to use the legacy memory layout.
191 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
192 * return 1;
193 */
194
195 return sysctl_legacy_va_layout;
196}
197
198static unsigned long mmap_rnd(void)
199{
200 unsigned long rnd = 0;
201
202 if (current->flags & PF_RANDOMIZE)
203 rnd = get_random_u32() & MMAP_RND_MASK;
204
205 return rnd << PAGE_SHIFT;
206}
207
208unsigned long arch_mmap_rnd(void)
209{
210 return (get_random_u32() & MMAP_RND_MASK) << PAGE_SHIFT;
211}
212
213static unsigned long mmap_legacy_base(void)
214{
215 return TASK_UNMAPPED_BASE + mmap_rnd();
216}
217
218/*
219 * This function, called very early during the creation of a new
220 * process VM image, sets up which VM layout function to use:
221 */
222void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
223{
224 mm->mmap_legacy_base = mmap_legacy_base();
225 mm->mmap_base = mmap_upper_limit(rlim_stack);
226
227 if (mmap_is_legacy()) {
228 mm->mmap_base = mm->mmap_legacy_base;
229 mm->get_unmapped_area = arch_get_unmapped_area;
230 } else {
231 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
232 }
233}
234
235
236asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
237 unsigned long prot, unsigned long flags, unsigned long fd,
238 unsigned long pgoff)
239{
240 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
241 we have. */
242 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
243 pgoff >> (PAGE_SHIFT - 12));

--- 213 unchanged lines hidden --- 		184asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
185 unsigned long prot, unsigned long flags, unsigned long fd,
186 unsigned long pgoff)
187{
188 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
189 we have. */
190 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
191 pgoff >> (PAGE_SHIFT - 12));

--- 213 unchanged lines hidden ---