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- /* Solaris host-specific hook definitions.
- Copyright (C) 2004-2015 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 "hosthooks.h"
- #include "hosthooks-def.h"
- #undef HOST_HOOKS_GT_PCH_GET_ADDRESS
- #define HOST_HOOKS_GT_PCH_GET_ADDRESS sol_gt_pch_get_address
- #undef HOST_HOOKS_GT_PCH_USE_ADDRESS
- #define HOST_HOOKS_GT_PCH_USE_ADDRESS sol_gt_pch_use_address
- /* Before Solaris 11, the mmap ADDR parameter is mostly ignored without
- MAP_FIXED set. Before we give up, search the desired address space with
- mincore 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)
- {
- size_t page_size = getpagesize();
- char one_byte;
- size_t i;
- if (base != (void *) MAP_FAILED)
- munmap ((caddr_t) base, len);
- errno = 0;
- for (i = 0; i < len; i += page_size)
- if (mincore ((char *)addr + i, page_size, (char *) &one_byte) == -1
- && errno == ENOMEM)
- continue; /* The page is not mapped. */
- else
- break;
- if (i >= len)
- base = mmap ((caddr_t) addr, len, prot, flags | MAP_FIXED, fd, off);
- }
- return base;
- }
- /* For various ports, try to guess a fixed spot in the vm space
- that's probably free. Based on McDougall, Mauro, Solaris Internals, 2nd
- ed., p.460-461, fig. 9-3, 9-4, 9-5. */
- #if defined(__sparcv9__)
- /* This low to avoid VA hole on UltraSPARC I/II. */
- # define TRY_EMPTY_VM_SPACE 0x70000000000
- #elif defined(__sparc__)
- # define TRY_EMPTY_VM_SPACE 0x80000000
- #elif defined(__x86_64__)
- # define TRY_EMPTY_VM_SPACE 0x80000000000
- #elif defined(__i386__)
- # define TRY_EMPTY_VM_SPACE 0xB0000000
- #else
- # define TRY_EMPTY_VM_SPACE 0
- #endif
- /* 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 *
- sol_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
- sol_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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