| /* Tru64 UNIX host-specific hook definitions. |
| Copyright (C) 2011 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC 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 3, or (at your |
| option) any later version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include <sys/mman.h> |
| /* Inhibit inclusion of <sys/mount.h>, unnecessary and errors out due to |
| use of poisoned bcmp, bcopy. */ |
| #define _SYS_MOUNT_H_ |
| #include <sys/procfs.h> |
| #include "hosthooks.h" |
| #include "hosthooks-def.h" |
| |
| |
| #undef HOST_HOOKS_GT_PCH_GET_ADDRESS |
| #define HOST_HOOKS_GT_PCH_GET_ADDRESS osf_gt_pch_get_address |
| #undef HOST_HOOKS_GT_PCH_USE_ADDRESS |
| #define HOST_HOOKS_GT_PCH_USE_ADDRESS osf_gt_pch_use_address |
| |
| /* The mmap ADDR parameter may be ignored without MAP_FIXED set. Before we |
| give up, check existing mappings with ioctl(PIOCMAP) to see if the space |
| is really free. */ |
| |
| static void * |
| mmap_fixed (void *addr, size_t len, int prot, int flags, int fd, off_t off) |
| { |
| void *base; |
| |
| base = mmap ((caddr_t) addr, len, prot, flags, fd, off); |
| |
| if (base != addr) |
| { |
| /* PID_MAX is SHRT_MAX on Tru64 UNIX V4.0, but INT_MAX on V5.1. |
| Allow for both. "/proc/" + INT_MAX + '\0'. */ |
| char pname[6+10+1]; |
| int procfd, nmap; |
| prmap_t *pmap; |
| int i, overlap = 0; |
| |
| if (base != (void *) MAP_FAILED) |
| munmap ((caddr_t) base, len); |
| |
| /* Check if there's any mapping overlapping [addr, addr+len). */ |
| |
| snprintf (pname, sizeof (pname), "/proc/%d", getpid ()); |
| procfd = open (pname, O_RDONLY); |
| if (procfd == -1) |
| return ((void *) MAP_FAILED); |
| if (ioctl (procfd, PIOCNMAP, &nmap) == -1) |
| return ((void *) MAP_FAILED); |
| pmap = (prmap_t *) xmalloc (sizeof (*pmap) * (nmap+1)); |
| if (ioctl (procfd, PIOCMAP, pmap) == -1) |
| return ((void *) MAP_FAILED); |
| |
| /* It seems like pmap[] is sorted by address, but can we rely on |
| that? */ |
| for (i = 0; i < nmap; i++) |
| { |
| uintptr_t map_start = (uintptr_t) pmap[i].pr_vaddr; |
| uintptr_t map_end = map_start + pmap[i].pr_size; |
| |
| if ((uintptr_t) addr < map_end |
| && (uintptr_t) addr+len > map_start) |
| { |
| overlap = 1; |
| break; |
| } |
| } |
| free (pmap); |
| close (procfd); |
| |
| if (!overlap) |
| base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off); |
| else |
| base = mmap ((caddr_t) addr, len, prot, flags, fd, off); |
| } |
| |
| return base; |
| } |
| |
| /* For various ports, try to guess a fixed spot in the vm space that's |
| probably free. Take the middle between start of text segment and |
| dynamic loader space. See <sys/machine/addrconf.h> and Tru64 UNIX |
| Assembly Language Programmer's Guide, p.6-18, Figure 6-3: Default Layout |
| of Memory (User Program View). */ |
| #define TRY_EMPTY_VM_SPACE 0x20050000000 |
| |
| /* Determine a location where we might be able to reliably allocate |
| SIZE bytes. FD is the PCH file, though we should return with the |
| file unmapped. */ |
| |
| static void * |
| osf_gt_pch_get_address (size_t size, int fd) |
| { |
| void *addr; |
| |
| addr = mmap_fixed ((caddr_t) TRY_EMPTY_VM_SPACE, size, |
| PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); |
| |
| /* If we failed the map, that means there's *no* free space. */ |
| if (addr == (void *) MAP_FAILED) |
| return NULL; |
| /* Unmap the area before returning. */ |
| munmap ((caddr_t) addr, size); |
| |
| return addr; |
| } |
| |
| /* Map SIZE bytes of FD+OFFSET at BASE. Return 1 if we succeeded at |
| mapping the data at BASE, -1 if we couldn't. */ |
| |
| static int |
| osf_gt_pch_use_address (void *base, size_t size, int fd, size_t offset) |
| { |
| void *addr; |
| |
| /* We're called with size == 0 if we're not planning to load a PCH |
| file at all. This allows the hook to free any static space that |
| we might have allocated at link time. */ |
| if (size == 0) |
| return -1; |
| |
| addr = mmap_fixed ((caddr_t) base, size, |
| PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, offset); |
| |
| return addr == base ? 1 : -1; |
| } |
| |
| |
| const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER; |