1/* Tru64 UNIX host-specific hook definitions. 2 Copyright (C) 2011 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published 8 by the Free Software Foundation; either version 3, or (at your 9 option) any later version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14 License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20#include "config.h" 21#include "system.h" 22#include "coretypes.h" 23#include <sys/mman.h> 24/* Inhibit inclusion of <sys/mount.h>, unnecessary and errors out due to 25 use of poisoned bcmp, bcopy. */ 26#define _SYS_MOUNT_H_ 27#include <sys/procfs.h> 28#include "hosthooks.h" 29#include "hosthooks-def.h" 30 31 32#undef HOST_HOOKS_GT_PCH_GET_ADDRESS 33#define HOST_HOOKS_GT_PCH_GET_ADDRESS osf_gt_pch_get_address 34#undef HOST_HOOKS_GT_PCH_USE_ADDRESS 35#define HOST_HOOKS_GT_PCH_USE_ADDRESS osf_gt_pch_use_address 36 37/* The mmap ADDR parameter may be ignored without MAP_FIXED set. Before we 38 give up, check existing mappings with ioctl(PIOCMAP) to see if the space 39 is really free. */ 40 41static void * 42mmap_fixed (void *addr, size_t len, int prot, int flags, int fd, off_t off) 43{ 44 void *base; 45 46 base = mmap ((caddr_t) addr, len, prot, flags, fd, off); 47 48 if (base != addr) 49 { 50 /* PID_MAX is SHRT_MAX on Tru64 UNIX V4.0, but INT_MAX on V5.1. 51 Allow for both. "/proc/" + INT_MAX + '\0'. */ 52 char pname[6+10+1]; 53 int procfd, nmap; 54 prmap_t *pmap; 55 int i, overlap = 0; 56 57 if (base != (void *) MAP_FAILED) 58 munmap ((caddr_t) base, len); 59 60 /* Check if there's any mapping overlapping [addr, addr+len). */ 61 62 snprintf (pname, sizeof (pname), "/proc/%d", getpid ()); 63 procfd = open (pname, O_RDONLY); 64 if (procfd == -1) 65 return ((void *) MAP_FAILED); 66 if (ioctl (procfd, PIOCNMAP, &nmap) == -1) 67 return ((void *) MAP_FAILED); 68 pmap = (prmap_t *) xmalloc (sizeof (*pmap) * (nmap+1)); 69 if (ioctl (procfd, PIOCMAP, pmap) == -1) 70 return ((void *) MAP_FAILED); 71 72 /* It seems like pmap[] is sorted by address, but can we rely on 73 that? */ 74 for (i = 0; i < nmap; i++) 75 { 76 uintptr_t map_start = (uintptr_t) pmap[i].pr_vaddr; 77 uintptr_t map_end = map_start + pmap[i].pr_size; 78 79 if ((uintptr_t) addr < map_end 80 && (uintptr_t) addr+len > map_start) 81 { 82 overlap = 1; 83 break; 84 } 85 } 86 free (pmap); 87 close (procfd); 88 89 if (!overlap) 90 base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off); 91 else 92 base = mmap ((caddr_t) addr, len, prot, flags, fd, off); 93 } 94 95 return base; 96} 97 98/* For various ports, try to guess a fixed spot in the vm space that's 99 probably free. Take the middle between start of text segment and 100 dynamic loader space. See <sys/machine/addrconf.h> and Tru64 UNIX 101 Assembly Language Programmer's Guide, p.6-18, Figure 6-3: Default Layout 102 of Memory (User Program View). */ 103#define TRY_EMPTY_VM_SPACE 0x20050000000 104 105/* Determine a location where we might be able to reliably allocate 106 SIZE bytes. FD is the PCH file, though we should return with the 107 file unmapped. */ 108 109static void * 110osf_gt_pch_get_address (size_t size, int fd) 111{ 112 void *addr; 113 114 addr = mmap_fixed ((caddr_t) TRY_EMPTY_VM_SPACE, size, 115 PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); 116 117 /* If we failed the map, that means there's *no* free space. */ 118 if (addr == (void *) MAP_FAILED) 119 return NULL; 120 /* Unmap the area before returning. */ 121 munmap ((caddr_t) addr, size); 122 123 return addr; 124} 125 126/* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at 127 mapping the data at BASE, -1 if we couldn't. */ 128 129static int 130osf_gt_pch_use_address (void *base, size_t size, int fd, size_t offset) 131{ 132 void *addr; 133 134 /* We're called with size == 0 if we're not planning to load a PCH 135 file at all. This allows the hook to free any static space that 136 we might have allocated at link time. */ 137 if (size == 0) 138 return -1; 139 140 addr = mmap_fixed ((caddr_t) base, size, 141 PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset); 142 143 return addr == base ? 1 : -1; 144} 145 146 147const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; 148