FRV: Miscellaneous fixes
[linux-2.6.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         unsigned long limit;
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         addr = PAGE_SIZE;
83         limit = (current->mm->start_stack - 0x00200000);
84         if (addr + len <= limit) {
85                 limit -= len;
86
87                 if (addr <= limit) {
88                         vma = find_vma(current->mm, PAGE_SIZE);
89                         for (; vma; vma = vma->vm_next) {
90                                 if (addr > limit)
91                                         break;
92                                 if (addr + len <= vma->vm_start)
93                                         goto success;
94                                 addr = vma->vm_end;
95                         }
96                 }
97         }
98
99         /* search from just above the WorkRAM area to the top of memory */
100         addr = PAGE_ALIGN(0x80000000);
101         limit = TASK_SIZE - len;
102         if (addr <= limit) {
103                 vma = find_vma(current->mm, addr);
104                 for (; vma; vma = vma->vm_next) {
105                         if (addr > limit)
106                                 break;
107                         if (addr + len <= vma->vm_start)
108                                 goto success;
109                         addr = vma->vm_end;
110                 }
111
112                 if (!vma && addr <= limit)
113                         goto success;
114         }
115
116 #if 0
117         printk("[area] l=%lx (ENOMEM) f='%s'\n",
118                len, filp ? filp->f_path.dentry->d_name.name : "");
119 #endif
120         return -ENOMEM;
121
122  success:
123 #if 0
124         printk("[area] l=%lx ad=%lx f='%s'\n",
125                len, addr, filp ? filp->f_path.dentry->d_name.name : "");
126 #endif
127         return addr;
128 } /* end arch_get_unmapped_area() */