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author | 2015-08-28 09:58:54 +0800 | |
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committer | 2015-09-01 12:44:00 +0800 | |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/interface/linux/linux_umalloc.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/ipxe/src/interface/linux/linux_umalloc.c')
-rw-r--r-- | qemu/roms/ipxe/src/interface/linux/linux_umalloc.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/interface/linux/linux_umalloc.c b/qemu/roms/ipxe/src/interface/linux/linux_umalloc.c new file mode 100644 index 000000000..aa0052c53 --- /dev/null +++ b/qemu/roms/ipxe/src/interface/linux/linux_umalloc.c @@ -0,0 +1,154 @@ +/* + * Copyright (C) 2010 Piotr JaroszyĆski <p.jaroszynski@gmail.com> + * + * This program 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 2 of the + * License, or any later version. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +FILE_LICENCE(GPL2_OR_LATER); + +#include <valgrind/memcheck.h> + +/** @file + * + * iPXE user memory allocation API for linux + * + */ + +#include <assert.h> +#include <ipxe/umalloc.h> + +#include <linux_api.h> + +/** Special address returned for empty allocations */ +#define NOWHERE ((void *)-1) + +/** Poison to make the metadata more unique */ +#define POISON 0xa5a5a5a5 +#define min(a,b) (((a)<(b))?(a):(b)) + +/** Metadata stored at the beginning of all allocations */ +struct metadata +{ + unsigned poison; + size_t size; +}; + +#define SIZE_MD (sizeof(struct metadata)) + +/** Simple realloc which passes most of the work to mmap(), mremap() and munmap() */ +static void * linux_realloc(void *ptr, size_t size) +{ + struct metadata md = {0, 0}; + struct metadata * mdptr = NULL; + + DBG2("linux_realloc(%p, %zd)\n", ptr, size); + + /* Check whether we have a valid pointer */ + if (ptr != NULL && ptr != NOWHERE) { + mdptr = ptr - SIZE_MD; + VALGRIND_MAKE_MEM_DEFINED(mdptr, SIZE_MD); + md = *mdptr; + VALGRIND_MAKE_MEM_NOACCESS(mdptr, SIZE_MD); + + /* Check for poison in the metadata */ + if (md.poison != POISON) { + DBG("linux_realloc bad poison: 0x%x (expected 0x%x)\n", md.poison, POISON); + return NULL; + } + } else { + /* Handle NOWHERE as NULL */ + ptr = NULL; + } + + /* + * At this point, ptr is either NULL or pointing to a region allocated by us. + * In the latter case mdptr is pointing to a valid metadata, otherwise it is NULL. + */ + + /* Handle deallocation or allocation of size 0 */ + if (size == 0) { + if (mdptr) { + if (linux_munmap(mdptr, md.size)) + DBG("linux_realloc munmap failed: %s\n", linux_strerror(linux_errno)); + VALGRIND_FREELIKE_BLOCK(ptr, sizeof(*mdptr)); + } + return NOWHERE; + } + + if (ptr) { + char *vbits = NULL; + + if (RUNNING_ON_VALGRIND > 0) + vbits = linux_realloc(NULL, min(size, md.size)); + +/* prevent an unused variable warning when building w/o valgrind support */ +#ifndef NVALGRIND + VALGRIND_GET_VBITS(ptr, vbits, min(size, md.size)); +#endif + + VALGRIND_FREELIKE_BLOCK(ptr, SIZE_MD); + + mdptr = linux_mremap(mdptr, md.size + SIZE_MD, size + SIZE_MD, MREMAP_MAYMOVE); + if (mdptr == MAP_FAILED) { + DBG("linux_realloc mremap failed: %s\n", linux_strerror(linux_errno)); + return NULL; + } + ptr = ((void *)mdptr) + SIZE_MD; + + VALGRIND_MALLOCLIKE_BLOCK(ptr, size, SIZE_MD, 0); +/* prevent an unused variable warning when building w/o valgrind support */ +#ifndef NVALGRIND + VALGRIND_SET_VBITS(ptr, vbits, min(size, md.size)); +#endif + + if (RUNNING_ON_VALGRIND > 0) + linux_realloc(vbits, 0); + } else { + mdptr = linux_mmap(NULL, size + SIZE_MD, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (mdptr == MAP_FAILED) { + DBG("linux_realloc mmap failed: %s\n", linux_strerror(linux_errno)); + return NULL; + } + ptr = ((void *)mdptr) + SIZE_MD; + VALGRIND_MALLOCLIKE_BLOCK(ptr, size, SIZE_MD, 0); + } + + /* Update the metadata */ + VALGRIND_MAKE_MEM_DEFINED(mdptr, SIZE_MD); + mdptr->poison = POISON; + mdptr->size = size; + VALGRIND_MAKE_MEM_NOACCESS(mdptr, SIZE_MD); + // VALGRIND_MALLOCLIKE_BLOCK ignores redzones currently, make our own + VALGRIND_MAKE_MEM_NOACCESS(ptr + size, SIZE_MD); + + return ptr; +} + +/** + * Reallocate external memory + * + * @v old_ptr Memory previously allocated by umalloc(), or UNULL + * @v new_size Requested size + * @ret new_ptr Allocated memory, or UNULL + * + * Calling realloc() with a new size of zero is a valid way to free a + * memory block. + */ +static userptr_t linux_urealloc(userptr_t old_ptr, size_t new_size) +{ + return (userptr_t)linux_realloc((void *)old_ptr, new_size); +} + +PROVIDE_UMALLOC(linux, urealloc, linux_urealloc); |