mm: use vm_unmapped_area() on frv architecture
[linux-3.10.git] / arch / frv / mm / elf-fdpic.c
1 /* elf-fdpic.c: ELF FDPIC memory layout management
2  *
3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/sched.h>
13 #include <linux/mm.h>
14 #include <linux/fs.h>
15 #include <linux/elf-fdpic.h>
16 #include <asm/mman.h>
17
18 /*****************************************************************************/
19 /*
20  * lay out the userspace VM according to our grand design
21  */
22 #ifdef CONFIG_MMU
23 void elf_fdpic_arch_lay_out_mm(struct elf_fdpic_params *exec_params,
24                                struct elf_fdpic_params *interp_params,
25                                unsigned long *start_stack,
26                                unsigned long *start_brk)
27 {
28         *start_stack = 0x02200000UL;
29
30         /* if the only executable is a shared object, assume that it is an interpreter rather than
31          * a true executable, and map it such that "ld.so --list" comes out right
32          */
33         if (!(interp_params->flags & ELF_FDPIC_FLAG_PRESENT) &&
34             exec_params->hdr.e_type != ET_EXEC
35             ) {
36                 exec_params->load_addr = PAGE_SIZE;
37
38                 *start_brk = 0x80000000UL;
39         }
40         else {
41                 exec_params->load_addr = 0x02200000UL;
42
43                 if ((exec_params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
44                     ELF_FDPIC_FLAG_INDEPENDENT
45                     ) {
46                         exec_params->flags &= ~ELF_FDPIC_FLAG_ARRANGEMENT;
47                         exec_params->flags |= ELF_FDPIC_FLAG_CONSTDISP;
48                 }
49         }
50
51 } /* end elf_fdpic_arch_lay_out_mm() */
52 #endif
53
54 /*****************************************************************************/
55 /*
56  * place non-fixed mmaps firstly in the bottom part of memory, working up, and then in the top part
57  * of memory, working down
58  */
59 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len,
60                                      unsigned long pgoff, unsigned long flags)
61 {
62         struct vm_area_struct *vma;
63         struct vm_unmapped_area_info info;
64
65         if (len > TASK_SIZE)
66                 return -ENOMEM;
67
68         /* handle MAP_FIXED */
69         if (flags & MAP_FIXED)
70                 return addr;
71
72         /* only honour a hint if we're not going to clobber something doing so */
73         if (addr) {
74                 addr = PAGE_ALIGN(addr);
75                 vma = find_vma(current->mm, addr);
76                 if (TASK_SIZE - len >= addr &&
77                     (!vma || addr + len <= vma->vm_start))
78                         goto success;
79         }
80
81         /* search between the bottom of user VM and the stack grow area */
82         info.flags = 0;
83         info.length = len;
84         info.low_limit = PAGE_SIZE;
85         info.high_limit = (current->mm->start_stack - 0x00200000);
86         info.align_mask = 0;
87         info.align_offset = 0;
88         addr = vm_unmapped_area(&info);
89         if (!(addr & ~PAGE_MASK))
90                 goto success;
91         VM_BUG_ON(addr != -ENOMEM);
92
93         /* search from just above the WorkRAM area to the top of memory */
94         info.low_limit = PAGE_ALIGN(0x80000000);
95         info.high_limit = TASK_SIZE;
96         addr = vm_unmapped_area(&info);
97         if (!(addr & ~PAGE_MASK))
98                 goto success;
99         VM_BUG_ON(addr != -ENOMEM);
100
101 #if 0
102         printk("[area] l=%lx (ENOMEM) f='%s'\n",
103                len, filp ? filp->f_path.dentry->d_name.name : "");
104 #endif
105         return -ENOMEM;
106
107  success:
108 #if 0
109         printk("[area] l=%lx ad=%lx f='%s'\n",
110                len, addr, filp ? filp->f_path.dentry->d_name.name : "");
111 #endif
112         return addr;
113 } /* end arch_get_unmapped_area() */