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Use alignment macros, pagesize and powerof2. 

We are replacing all of the bespoke alignment code with
ALIGN_UP, ALIGN_DOWN, PTR_ALIGN_UP, and PTR_ALIGN_DOWN.
This cleans up malloc/malloc.c, malloc/arena.c, and
elf/dl-reloc.c. It also makes all the code consistently
use pagesize, and powerof2 as required.

Code size is reduced with the removal of precomputed
pagemask, and use of pagesize instead. No measurable
difference in performance.

No regressions on x86_64.
This commit is contained in:
Carlos O'Donell 2015-02-17 19:25:01 -05:00
parent 1a2325c06c
commit 8a35c3fe12
4 changed files with 57 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
ChangeLog
View File

@ -1,3 +1,19 @@
2015-02-17 Carlos O'Donell <carlos@redhat.com>
* dl-reloc.c: Inlucde libc-internal.h.
(_dl_try_allocate_static_tls): Call ALIGN_UP.
(_dl_relocate_object): Call ALIGN_UP, ALIGN_DOWN, and PTR_ALIGN_DOWN.
(_dl_protect_relro): Call ALIGN_UP and ALIGN_DOWN.
* malloc/arena.c (new_heap): Use pagesize. Call ALIGN_UP.
(grow_heap): Likewise.
* malloc/malloc.c: Include libc-internal.h.
(do_check_malloc): Call powerof2.
(sysmalloc): Use pagesize. Call ALIGN_UP.
(systrim): Use pagesize.
(mremap_chunk): Use pagesize. Call ALIGN_UP.
(__libc_valloc): Use pagesize.
(__libc_pvalloc): Use pagesize. Call ALIGN_UP.
2015-02-17 Joseph Myers <joseph@codesourcery.com>
[BZ #17991]

28
elf/dl-reloc.c
View File

@ -26,6 +26,7 @@
#include <sys/types.h>
#include <_itoa.h>
#include "dynamic-link.h"
#include <libc-internal.h>
/* Statistics function. */
#ifdef SHARED
@ -74,9 +75,9 @@ _dl_try_allocate_static_tls (struct link_map *map)
map->l_tls_offset = GL(dl_tls_static_used) = offset;
#elif TLS_DTV_AT_TP
/* dl_tls_static_used includes the TCB at the beginning. */
size_t offset = (((GL(dl_tls_static_used)
- map->l_tls_firstbyte_offset
+ map->l_tls_align - 1) & -map->l_tls_align)
size_t offset = (ALIGN_UP(GL(dl_tls_static_used)
- map->l_tls_firstbyte_offset,
map->l_tls_align)
+ map->l_tls_firstbyte_offset);
size_t used = offset + map->l_tls_blocksize;
@ -201,11 +202,10 @@ _dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],
struct textrels *newp;
newp = (struct textrels *) alloca (sizeof (*newp));
newp->len = (((ph->p_vaddr + ph->p_memsz + GLRO(dl_pagesize) - 1)
& ~(GLRO(dl_pagesize) - 1))
- (ph->p_vaddr & ~(GLRO(dl_pagesize) - 1)));
newp->start = ((ph->p_vaddr & ~(GLRO(dl_pagesize) - 1))
+ (caddr_t) l->l_addr);
newp->len = ALIGN_UP (ph->p_vaddr + ph->p_memsz, GLRO(dl_pagesize))
- ALIGN_DOWN (ph->p_vaddr, GLRO(dl_pagesize));
newp->start = PTR_ALIGN_DOWN (ph->p_vaddr, GLRO(dl_pagesize))
+ (caddr_t) l->l_addr;
if (__mprotect (newp->start, newp->len, PROT_READ|PROT_WRITE) < 0)
{
@ -324,11 +324,13 @@ _dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],
void internal_function
_dl_protect_relro (struct link_map *l)
{
ElfW(Addr) start = ((l->l_addr + l->l_relro_addr)
& ~(GLRO(dl_pagesize) - 1));
ElfW(Addr) end = ((l->l_addr + l->l_relro_addr + l->l_relro_size)
& ~(GLRO(dl_pagesize) - 1));
ElfW(Addr) start = ALIGN_DOWN((l->l_addr
+ l->l_relro_addr),
GLRO(dl_pagesize));
ElfW(Addr) end = ALIGN_DOWN((l->l_addr
+ l->l_relro_addr
+ l->l_relro_size),
GLRO(dl_pagesize));
if (start != end
&& __mprotect ((void *) start, end - start, PROT_READ) < 0)
{

8
malloc/arena.c
View File

@ -510,7 +510,7 @@ static heap_info *
internal_function
new_heap (size_t size, size_t top_pad)
{
size_t page_mask = GLRO (dl_pagesize) - 1;
size_t pagesize = GLRO (dl_pagesize);
char *p1, *p2;
unsigned long ul;
heap_info *h;
@ -523,7 +523,7 @@ new_heap (size_t size, size_t top_pad)
return 0;
else
size = HEAP_MAX_SIZE;
size = (size + page_mask) & ~page_mask;
size = ALIGN_UP (size, pagesize);
/* A memory region aligned to a multiple of HEAP_MAX_SIZE is needed.
No swap space needs to be reserved for the following large
@ -588,10 +588,10 @@ new_heap (size_t size, size_t top_pad)
static int
grow_heap (heap_info *h, long diff)
{
size_t page_mask = GLRO (dl_pagesize) - 1;
size_t pagesize = GLRO (dl_pagesize);
long new_size;
diff = (diff + page_mask) & ~page_mask;
diff = ALIGN_UP (diff, pagesize);
new_size = (long) h->size + diff;
if ((unsigned long) new_size > (unsigned long) HEAP_MAX_SIZE)
return -1;

42
malloc/malloc.c
View File

@ -241,6 +241,9 @@
/* For MIN, MAX, powerof2. */
#include <sys/param.h>
/* For ALIGN_UP. */
#include <libc-internal.h>
/*
Debugging:
@ -2111,7 +2114,7 @@ do_check_malloc_state (mstate av)
return;
/* pagesize is a power of 2 */
assert ((GLRO (dl_pagesize) & (GLRO (dl_pagesize) - 1)) == 0);
assert (powerof2(GLRO (dl_pagesize)));
/* A contiguous main_arena is consistent with sbrk_base. */
if (av == &main_arena && contiguous (av))
@ -2266,7 +2269,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
unsigned long remainder_size; /* its size */
size_t pagemask = GLRO (dl_pagesize) - 1;
size_t pagesize = GLRO (dl_pagesize);
bool tried_mmap = false;
@ -2292,9 +2295,9 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
need for further alignments unless we have have high alignment.
*/
if (MALLOC_ALIGNMENT == 2 * SIZE_SZ)
size = (nb + SIZE_SZ + pagemask) & ~pagemask;
size = ALIGN_UP (nb + SIZE_SZ, pagesize);
else
size = (nb + SIZE_SZ + MALLOC_ALIGN_MASK + pagemask) & ~pagemask;
size = ALIGN_UP (nb + SIZE_SZ + MALLOC_ALIGN_MASK, pagesize);
tried_mmap = true;
/* Don't try if size wraps around 0 */
@ -2367,7 +2370,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
assert ((old_top == initial_top (av) && old_size == 0) ||
((unsigned long) (old_size) >= MINSIZE &&
prev_inuse (old_top) &&
((unsigned long) old_end & pagemask) == 0));
((unsigned long) old_end & (pagesize - 1)) == 0));
/* Precondition: not enough current space to satisfy nb request */
assert ((unsigned long) (old_size) < (unsigned long) (nb + MINSIZE));
@ -2447,7 +2450,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
previous calls. Otherwise, we correct to page-align below.
*/
size = (size + pagemask) & ~pagemask;
size = ALIGN_UP (size, pagesize);
/*
Don't try to call MORECORE if argument is so big as to appear
@ -2481,7 +2484,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
/* Cannot merge with old top, so add its size back in */
if (contiguous (av))
size = (size + old_size + pagemask) & ~pagemask;
size = ALIGN_UP (size + old_size, pagesize);
/* If we are relying on mmap as backup, then use larger units */
if ((unsigned long) (size) < (unsigned long) (MMAP_AS_MORECORE_SIZE))
@ -2587,7 +2590,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
/* Extend the end address to hit a page boundary */
end_misalign = (INTERNAL_SIZE_T) (brk + size + correction);
correction += ((end_misalign + pagemask) & ~pagemask) - end_misalign;
correction += (ALIGN_UP (end_misalign, pagesize)) - end_misalign;
assert (correction >= 0);
snd_brk = (char *) (MORECORE (correction));
@ -2738,10 +2741,10 @@ systrim (size_t pad, mstate av)
long released; /* Amount actually released */
char *current_brk; /* address returned by pre-check sbrk call */
char *new_brk; /* address returned by post-check sbrk call */
size_t pagesz;
size_t pagesize;
long top_area;
pagesz = GLRO (dl_pagesize);
pagesize = GLRO (dl_pagesize);
top_size = chunksize (av->top);
top_area = top_size - MINSIZE - 1;
@ -2749,7 +2752,7 @@ systrim (size_t pad, mstate av)
return 0;
/* Release in pagesize units, keeping at least one page */
extra = (top_area - pad) & ~(pagesz - 1);
extra = (top_area - pad) & ~(pagesize - 1);
if (extra == 0)
return 0;
@ -2834,7 +2837,7 @@ static mchunkptr
internal_function
mremap_chunk (mchunkptr p, size_t new_size)
{
size_t page_mask = GLRO (dl_pagesize) - 1;
size_t pagesize = GLRO (dl_pagesize);
INTERNAL_SIZE_T offset = p->prev_size;
INTERNAL_SIZE_T size = chunksize (p);
char *cp;
@ -2843,7 +2846,7 @@ mremap_chunk (mchunkptr p, size_t new_size)
assert (((size + offset) & (GLRO (dl_pagesize) - 1)) == 0);
/* Note the extra SIZE_SZ overhead as in mmap_chunk(). */
new_size = (new_size + offset + SIZE_SZ + page_mask) & ~page_mask;
new_size = ALIGN_UP (new_size + offset + SIZE_SZ, pagesize);
/* No need to remap if the number of pages does not change. */
if (size + offset == new_size)
@ -3122,8 +3125,8 @@ __libc_valloc (size_t bytes)
ptmalloc_init ();
void *address = RETURN_ADDRESS (0);
size_t pagesz = GLRO (dl_pagesize);
return _mid_memalign (pagesz, bytes, address);
size_t pagesize = GLRO (dl_pagesize);
return _mid_memalign (pagesize, bytes, address);
}
void *
@ -3133,18 +3136,17 @@ __libc_pvalloc (size_t bytes)
ptmalloc_init ();
void *address = RETURN_ADDRESS (0);
size_t pagesz = GLRO (dl_pagesize);
size_t page_mask = GLRO (dl_pagesize) - 1;
size_t rounded_bytes = (bytes + page_mask) & ~(page_mask);
size_t pagesize = GLRO (dl_pagesize);
size_t rounded_bytes = ALIGN_UP (bytes, pagesize);
/* Check for overflow. */
if (bytes > SIZE_MAX - 2 * pagesz - MINSIZE)
if (bytes > SIZE_MAX - 2 * pagesize - MINSIZE)
{
__set_errno (ENOMEM);
return 0;
}
return _mid_memalign (pagesz, rounded_bytes, address);
return _mid_memalign (pagesize, rounded_bytes, address);
}
void *