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
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=259043
@ -352,6 +352,8 @@ Obj_Entry *map_object(int, const char *, const struct stat *);
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void *xcalloc(size_t, size_t);
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void *xmalloc(size_t);
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char *xstrdup(const char *);
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void *malloc_aligned(size_t size, size_t align);
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void free_aligned(void *ptr);
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extern Elf_Addr _GLOBAL_OFFSET_TABLE_[];
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extern Elf_Sym sym_zero; /* For resolving undefined weak refs. */
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@ -67,3 +67,33 @@ xstrdup(const char *str)
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memcpy(copy, str, len);
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return (copy);
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}
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void *
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malloc_aligned(size_t size, size_t align)
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{
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void *mem, *res;
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uintptr_t x;
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size_t asize, r;
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r = round(sizeof(void *), align);
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asize = round(size, align) + r;
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mem = xmalloc(asize);
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x = (uintptr_t)mem;
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res = (void *)round(x, align);
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*(void **)((uintptr_t)res - sizeof(void *)) = mem;
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return (res);
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}
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void
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free_aligned(void *ptr)
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{
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void *mem;
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uintptr_t x;
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if (ptr == NULL)
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return;
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x = (uintptr_t)ptr;
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x -= sizeof(void *);
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mem = *(void **)x;
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free(mem);
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}
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