diff options
Diffstat (limited to 'arch/frv/mm/elf-fdpic.c')
| -rw-r--r-- | arch/frv/mm/elf-fdpic.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/frv/mm/elf-fdpic.c b/arch/frv/mm/elf-fdpic.c new file mode 100644 index 00000000000..f5a653033fe --- /dev/null +++ b/arch/frv/mm/elf-fdpic.c @@ -0,0 +1,123 @@ +/* elf-fdpic.c: ELF FDPIC memory layout management + * + * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/fs.h> +#include <linux/elf-fdpic.h> + +/*****************************************************************************/ +/* + * lay out the userspace VM according to our grand design + */ +#ifdef CONFIG_MMU +void elf_fdpic_arch_lay_out_mm(struct elf_fdpic_params *exec_params, + struct elf_fdpic_params *interp_params, + unsigned long *start_stack, + unsigned long *start_brk) +{ + *start_stack = 0x02200000UL; + + /* if the only executable is a shared object, assume that it is an interpreter rather than + * a true executable, and map it such that "ld.so --list" comes out right + */ + if (!(interp_params->flags & ELF_FDPIC_FLAG_PRESENT) && + exec_params->hdr.e_type != ET_EXEC + ) { + exec_params->load_addr = PAGE_SIZE; + + *start_brk = 0x80000000UL; + } + else { + exec_params->load_addr = 0x02200000UL; + + if ((exec_params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == + ELF_FDPIC_FLAG_INDEPENDENT + ) { + exec_params->flags &= ~ELF_FDPIC_FLAG_ARRANGEMENT; + exec_params->flags |= ELF_FDPIC_FLAG_CONSTDISP; + } + } + +} /* end elf_fdpic_arch_lay_out_mm() */ +#endif + +/*****************************************************************************/ +/* + * place non-fixed mmaps firstly in the bottom part of memory, working up, and then in the top part + * of memory, working down + */ +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, + unsigned long pgoff, unsigned long flags) +{ + struct vm_area_struct *vma; + unsigned long limit; + + if (len > TASK_SIZE) + return -ENOMEM; + + /* only honour a hint if we're not going to clobber something doing so */ + if (addr) { + addr = PAGE_ALIGN(addr); + vma = find_vma(current->mm, addr); + if (TASK_SIZE - len >= addr && + (!vma || addr + len <= vma->vm_start)) + goto success; + } + + /* search between the bottom of user VM and the stack grow area */ + addr = PAGE_SIZE; + limit = (current->mm->start_stack - 0x00200000); + if (addr + len <= limit) { + limit -= len; + + if (addr <= limit) { + vma = find_vma(current->mm, PAGE_SIZE); + for (; vma; vma = vma->vm_next) { + if (addr > limit) + break; + if (addr + len <= vma->vm_start) + goto success; + addr = vma->vm_end; + } + } + } + + /* search from just above the WorkRAM area to the top of memory */ + addr = PAGE_ALIGN(0x80000000); + limit = TASK_SIZE - len; + if (addr <= limit) { + vma = find_vma(current->mm, addr); + for (; vma; vma = vma->vm_next) { + if (addr > limit) + break; + if (addr + len <= vma->vm_start) + goto success; + addr = vma->vm_end; + } + + if (!vma && addr <= limit) + goto success; + } + +#if 0 + printk("[area] l=%lx (ENOMEM) f='%s'\n", + len, filp ? filp->f_dentry->d_name.name : ""); +#endif + return -ENOMEM; + + success: +#if 0 + printk("[area] l=%lx ad=%lx f='%s'\n", + len, addr, filp ? filp->f_dentry->d_name.name : ""); +#endif + return addr; +} /* end arch_get_unmapped_area() */ |