Date: Fri, 6 Dec 2013 21:30:31 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r259043 - head/libexec/rtld-elf Message-ID: <201312062130.rB6LUVUu037674@svn.freebsd.org>
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Author: kib Date: Fri Dec 6 21:30:31 2013 New Revision: 259043 URL: http://svnweb.freebsd.org/changeset/base/259043 Log: Build an allocator for the aligned memory on top of the rtld-private malloc. Reviewed by: kan Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/libexec/rtld-elf/rtld.h head/libexec/rtld-elf/xmalloc.c Modified: head/libexec/rtld-elf/rtld.h ============================================================================== --- head/libexec/rtld-elf/rtld.h Fri Dec 6 21:26:57 2013 (r259042) +++ head/libexec/rtld-elf/rtld.h Fri Dec 6 21:30:31 2013 (r259043) @@ -352,6 +352,8 @@ Obj_Entry *map_object(int, const char *, void *xcalloc(size_t, size_t); void *xmalloc(size_t); char *xstrdup(const char *); +void *malloc_aligned(size_t size, size_t align); +void free_aligned(void *ptr); extern Elf_Addr _GLOBAL_OFFSET_TABLE_[]; extern Elf_Sym sym_zero; /* For resolving undefined weak refs. */ Modified: head/libexec/rtld-elf/xmalloc.c ============================================================================== --- head/libexec/rtld-elf/xmalloc.c Fri Dec 6 21:26:57 2013 (r259042) +++ head/libexec/rtld-elf/xmalloc.c Fri Dec 6 21:30:31 2013 (r259043) @@ -67,3 +67,33 @@ xstrdup(const char *str) memcpy(copy, str, len); return (copy); } + +void * +malloc_aligned(size_t size, size_t align) +{ + void *mem, *res; + uintptr_t x; + size_t asize, r; + + r = round(sizeof(void *), align); + asize = round(size, align) + r; + mem = xmalloc(asize); + x = (uintptr_t)mem; + res = (void *)round(x, align); + *(void **)((uintptr_t)res - sizeof(void *)) = mem; + return (res); +} + +void +free_aligned(void *ptr) +{ + void *mem; + uintptr_t x; + + if (ptr == NULL) + return; + x = (uintptr_t)ptr; + x -= sizeof(void *); + mem = *(void **)x; + free(mem); +}
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