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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [config/] [alpha/] [host-osf.c] - Rev 719
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/* 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;
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