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
23 unsigned long
arch_get_unmapped_area(struct file * filp,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)24 arch_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
67 asmlinkage long
ia64_getpriority(int which,int who)68 ia64_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... */
81 asmlinkage unsigned long
sys_getpagesize(void)82 sys_getpagesize (void)
83 {
84 return PAGE_SIZE;
85 }
86
87 asmlinkage unsigned long
ia64_brk(unsigned long brk)88 ia64_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 */
99 asmlinkage long
sys_ia64_pipe(void)100 sys_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
ia64_mmap_check(unsigned long addr,unsigned long len,unsigned long flags)115 int 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 */
136 asmlinkage unsigned long
sys_mmap2(unsigned long addr,unsigned long len,int prot,int flags,int fd,long pgoff)137 sys_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
145 asmlinkage unsigned long
sys_mmap(unsigned long addr,unsigned long len,int prot,int flags,int fd,long off)146 sys_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
157 asmlinkage unsigned long
ia64_mremap(unsigned long addr,unsigned long old_len,unsigned long new_len,unsigned long flags,unsigned long new_addr)158 ia64_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
169 asmlinkage long
sys_pciconfig_read(unsigned long bus,unsigned long dfn,unsigned long off,unsigned long len,void * buf)170 sys_pciconfig_read (unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len,
171 void *buf)
172 {
173 return -ENOSYS;
174 }
175
176 asmlinkage long
sys_pciconfig_write(unsigned long bus,unsigned long dfn,unsigned long off,unsigned long len,void * buf)177 sys_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 */
184