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/* Solaris host-specific hook definitions.
Copyright (C) 2004-2019 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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