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| 1 | /* Copyright 2005 Andi Kleen, SuSE Labs. | |||
| 2 | * Licensed under GPL, v.2 | |||
| 3 | */ | |||
| 4 | #include <linux/config.h> | |||
| 5 | #include <linux/mm.h> | |||
| 6 | #include <linux/sched.h> | |||
| 7 | #include <linux/random.h> | |||
| 8 | #include <asm/ia32.h> | |||
| 9 | ||||
| 10 | /* Notebook: move the mmap code from sys_x86_64.c over here. */ | |||
| 11 | ||||
| 131102 | 130625 | 12 | void arch_pick_mmap_layout(struct mm_struct *mm) | |
| 13 | { | |||
| 14 | #ifdef CONFIG_IA32_EMULATION | |||
| 477 | 130625 | 15 | if (current_thread_info()->flags & _TIF_IA32) | |
| 477 | 16 | return ia32_pick_mmap_layout(mm); | ||
| 17 | #endif | |||
| 18 | mm->mmap_base = TASK_UNMAPPED_BASE; | |||
| 0 | 130625 | - | 18 | ternary-?: test_ti_thread_flag ( current_threa.. |
| 0 | 0 | - | 18 | ternary-?: ( get_current ( ) -> personality & .. |
| 130439 | 186 | 19 | if (current->flags & PF_RANDOMIZE) { | |
| 20 | /* Add 28bit randomness which is about 40bits of address space | |||
| 21 | because mmap base has to be page aligned. | |||
| 22 | or ~1/128 of the total user VM | |||
| 23 | (total user address space is 47bits) */ | |||
| 24 | unsigned rnd = get_random_int() & 0xfffffff; | |||
| 25 | mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT; | |||
| 26 | } | |||
| 27 | mm->get_unmapped_area = arch_get_unmapped_area; | |||
| 28 | mm->unmap_area = arch_unmap_area; | |||
| 29 | } | |||
| 30 | ||||
| ***TER 70% (7/10) of SOURCE FILE mmap.c | ||||