Loading...
1/*
2 * This file contains various system calls that have different calling
3 * conventions on different platforms.
4 *
5 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
7 */
8#include <linux/errno.h>
9#include <linux/fs.h>
10#include <linux/mm.h>
11#include <linux/mman.h>
12#include <linux/sched.h>
13#include <linux/shm.h>
14#include <linux/file.h> /* doh, must come after sched.h... */
15#include <linux/smp.h>
16#include <linux/syscalls.h>
17#include <linux/highuid.h>
18#include <linux/hugetlb.h>
19
20#include <asm/shmparam.h>
21#include <asm/uaccess.h>
22
23unsigned long
24arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
25 unsigned long pgoff, unsigned long flags)
26{
27 long map_shared = (flags & MAP_SHARED);
28 unsigned long start_addr, align_mask = PAGE_SIZE - 1;
29 struct mm_struct *mm = current->mm;
30 struct vm_area_struct *vma;
31
32 if (len > RGN_MAP_LIMIT)
33 return -ENOMEM;
34
35 /* handle fixed mapping: prevent overlap with huge pages */
36 if (flags & MAP_FIXED) {
37 if (is_hugepage_only_range(mm, addr, len))
38 return -EINVAL;
39 return addr;
40 }
41
42#ifdef CONFIG_HUGETLB_PAGE
43 if (REGION_NUMBER(addr) == RGN_HPAGE)
44 addr = 0;
45#endif
46 if (!addr)
47 addr = mm->free_area_cache;
48
49 if (map_shared && (TASK_SIZE > 0xfffffffful))
50 /*
51 * For 64-bit tasks, align shared segments to 1MB to avoid potential
52 * performance penalty due to virtual aliasing (see ASDM). For 32-bit
53 * tasks, we prefer to avoid exhausting the address space too quickly by
54 * limiting alignment to a single page.
55 */
56 align_mask = SHMLBA - 1;
57
58 full_search:
59 start_addr = addr = (addr + align_mask) & ~align_mask;
60
61 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
62 /* At this point: (!vma || addr < vma->vm_end). */
63 if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) {
64 if (start_addr != TASK_UNMAPPED_BASE) {
65 /* Start a new search --- just in case we missed some holes. */
66 addr = TASK_UNMAPPED_BASE;
67 goto full_search;
68 }
69 return -ENOMEM;
70 }
71 if (!vma || addr + len <= vma->vm_start) {
72 /* Remember the address where we stopped this search: */
73 mm->free_area_cache = addr + len;
74 return addr;
75 }
76 addr = (vma->vm_end + align_mask) & ~align_mask;
77 }
78}
79
80asmlinkage long
81ia64_getpriority (int which, int who)
82{
83 long prio;
84
85 prio = sys_getpriority(which, who);
86 if (prio >= 0) {
87 force_successful_syscall_return();
88 prio = 20 - prio;
89 }
90 return prio;
91}
92
93/* XXX obsolete, but leave it here until the old libc is gone... */
94asmlinkage unsigned long
95sys_getpagesize (void)
96{
97 return PAGE_SIZE;
98}
99
100asmlinkage unsigned long
101ia64_brk (unsigned long brk)
102{
103 unsigned long retval = sys_brk(brk);
104 force_successful_syscall_return();
105 return retval;
106}
107
108/*
109 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
110 * and r9) as this is faster than doing a copy_to_user().
111 */
112asmlinkage long
113sys_ia64_pipe (void)
114{
115 struct pt_regs *regs = task_pt_regs(current);
116 int fd[2];
117 int retval;
118
119 retval = do_pipe_flags(fd, 0);
120 if (retval)
121 goto out;
122 retval = fd[0];
123 regs->r9 = fd[1];
124 out:
125 return retval;
126}
127
128int ia64_mmap_check(unsigned long addr, unsigned long len,
129 unsigned long flags)
130{
131 unsigned long roff;
132
133 /*
134 * Don't permit mappings into unmapped space, the virtual page table
135 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is
136 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
137 */
138 roff = REGION_OFFSET(addr);
139 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
140 return -EINVAL;
141 return 0;
142}
143
144/*
145 * mmap2() is like mmap() except that the offset is expressed in units
146 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces
147 * of) files that are larger than the address space of the CPU.
148 */
149asmlinkage unsigned long
150sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
151{
152 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
153 if (!IS_ERR((void *) addr))
154 force_successful_syscall_return();
155 return addr;
156}
157
158asmlinkage unsigned long
159sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
160{
161 if (offset_in_page(off) != 0)
162 return -EINVAL;
163
164 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
165 if (!IS_ERR((void *) addr))
166 force_successful_syscall_return();
167 return addr;
168}
169
170asmlinkage unsigned long
171ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
172 unsigned long new_addr)
173{
174 extern unsigned long do_mremap (unsigned long addr,
175 unsigned long old_len,
176 unsigned long new_len,
177 unsigned long flags,
178 unsigned long new_addr);
179
180 down_write(¤t->mm->mmap_sem);
181 {
182 addr = do_mremap(addr, old_len, new_len, flags, new_addr);
183 }
184 up_write(¤t->mm->mmap_sem);
185
186 if (IS_ERR((void *) addr))
187 return addr;
188
189 force_successful_syscall_return();
190 return addr;
191}
192
193#ifndef CONFIG_PCI
194
195asmlinkage long
196sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
197 void *buf)
198{
199 return -ENOSYS;
200}
201
202asmlinkage long
203sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
204 void *buf)
205{
206 return -ENOSYS;
207}
208
209#endif /* CONFIG_PCI */
1/*
2 * This file contains various system calls that have different calling
3 * conventions on different platforms.
4 *
5 * Copyright (C) 1999-2000, 2002-2003, 2005 Hewlett-Packard Co
6 * David Mosberger-Tang <davidm@hpl.hp.com>
7 */
8#include <linux/errno.h>
9#include <linux/fs.h>
10#include <linux/mm.h>
11#include <linux/mman.h>
12#include <linux/sched.h>
13#include <linux/shm.h>
14#include <linux/file.h> /* doh, must come after sched.h... */
15#include <linux/smp.h>
16#include <linux/syscalls.h>
17#include <linux/highuid.h>
18#include <linux/hugetlb.h>
19
20#include <asm/shmparam.h>
21#include <asm/uaccess.h>
22
23unsigned long
24arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len,
25 unsigned long pgoff, unsigned long flags)
26{
27 long map_shared = (flags & MAP_SHARED);
28 unsigned long align_mask = 0;
29 struct mm_struct *mm = current->mm;
30 struct vm_unmapped_area_info info;
31
32 if (len > RGN_MAP_LIMIT)
33 return -ENOMEM;
34
35 /* handle fixed mapping: prevent overlap with huge pages */
36 if (flags & MAP_FIXED) {
37 if (is_hugepage_only_range(mm, addr, len))
38 return -EINVAL;
39 return addr;
40 }
41
42#ifdef CONFIG_HUGETLB_PAGE
43 if (REGION_NUMBER(addr) == RGN_HPAGE)
44 addr = 0;
45#endif
46 if (!addr)
47 addr = TASK_UNMAPPED_BASE;
48
49 if (map_shared && (TASK_SIZE > 0xfffffffful))
50 /*
51 * For 64-bit tasks, align shared segments to 1MB to avoid potential
52 * performance penalty due to virtual aliasing (see ASDM). For 32-bit
53 * tasks, we prefer to avoid exhausting the address space too quickly by
54 * limiting alignment to a single page.
55 */
56 align_mask = PAGE_MASK & (SHMLBA - 1);
57
58 info.flags = 0;
59 info.length = len;
60 info.low_limit = addr;
61 info.high_limit = TASK_SIZE;
62 info.align_mask = align_mask;
63 info.align_offset = 0;
64 return vm_unmapped_area(&info);
65}
66
67asmlinkage long
68ia64_getpriority (int which, int who)
69{
70 long prio;
71
72 prio = sys_getpriority(which, who);
73 if (prio >= 0) {
74 force_successful_syscall_return();
75 prio = 20 - prio;
76 }
77 return prio;
78}
79
80/* XXX obsolete, but leave it here until the old libc is gone... */
81asmlinkage unsigned long
82sys_getpagesize (void)
83{
84 return PAGE_SIZE;
85}
86
87asmlinkage unsigned long
88ia64_brk (unsigned long brk)
89{
90 unsigned long retval = sys_brk(brk);
91 force_successful_syscall_return();
92 return retval;
93}
94
95/*
96 * On IA-64, we return the two file descriptors in ret0 and ret1 (r8
97 * and r9) as this is faster than doing a copy_to_user().
98 */
99asmlinkage long
100sys_ia64_pipe (void)
101{
102 struct pt_regs *regs = task_pt_regs(current);
103 int fd[2];
104 int retval;
105
106 retval = do_pipe_flags(fd, 0);
107 if (retval)
108 goto out;
109 retval = fd[0];
110 regs->r9 = fd[1];
111 out:
112 return retval;
113}
114
115int ia64_mmap_check(unsigned long addr, unsigned long len,
116 unsigned long flags)
117{
118 unsigned long roff;
119
120 /*
121 * Don't permit mappings into unmapped space, the virtual page table
122 * of a region, or across a region boundary. Note: RGN_MAP_LIMIT is
123 * equal to 2^n-PAGE_SIZE (for some integer n <= 61) and len > 0.
124 */
125 roff = REGION_OFFSET(addr);
126 if ((len > RGN_MAP_LIMIT) || (roff > (RGN_MAP_LIMIT - len)))
127 return -EINVAL;
128 return 0;
129}
130
131/*
132 * mmap2() is like mmap() except that the offset is expressed in units
133 * of PAGE_SIZE (instead of bytes). This allows to mmap2() (pieces
134 * of) files that are larger than the address space of the CPU.
135 */
136asmlinkage unsigned long
137sys_mmap2 (unsigned long addr, unsigned long len, int prot, int flags, int fd, long pgoff)
138{
139 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
140 if (!IS_ERR((void *) addr))
141 force_successful_syscall_return();
142 return addr;
143}
144
145asmlinkage unsigned long
146sys_mmap (unsigned long addr, unsigned long len, int prot, int flags, int fd, long off)
147{
148 if (offset_in_page(off) != 0)
149 return -EINVAL;
150
151 addr = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
152 if (!IS_ERR((void *) addr))
153 force_successful_syscall_return();
154 return addr;
155}
156
157asmlinkage unsigned long
158ia64_mremap (unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags,
159 unsigned long new_addr)
160{
161 addr = sys_mremap(addr, old_len, new_len, flags, new_addr);
162 if (!IS_ERR((void *) addr))
163 force_successful_syscall_return();
164 return addr;
165}
166
167#ifndef CONFIG_PCI
168
169asmlinkage long
170sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
171 void *buf)
172{
173 return -ENOSYS;
174}
175
176asmlinkage long
177sys_pciconfig_write (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
178 void *buf)
179{
180 return -ENOSYS;
181}
182
183#endif /* CONFIG_PCI */