Skip to content
GitLab
Commit 48d320c0 authored by Niels Möller's avatar Niels Möller
Browse files

New macros to help define resolver and wrappers for fat functions.

parent 0149d937
Hide whitespace changes
Inline Side-by-side
ChangeLog
View file @ 48d320c0
2015-01-17 Niels Möller <nisse@lysator.liu.se>
* fat-x86_64.c (DECLARE_FAT_FUNC, DEFINE_FAT_FUNC)
(DECLARE_FAT_FUNC_VAR): New macros, to define needed resolver and
wrapper functions.
* config.m4.in (SYMBOL_PREFIX): Define from from autoconf
ASM_SYMBOL_PREFIX.
(C_NAMS): move definition to...
......
fat-x86_64.c
View file @ 48d320c0
......@@ -49,7 +49,7 @@
threads.
The fat_init function checks the cpuid flags, and sets function
pointers, e.g, _aes_encrypt_vec, to point to the appropriate
pointers, e.g, _nettle_aes_encrypt_vec, to point to the appropriate
implementation.
To get everything hooked in, we use a belt-and-suspenders approach.
......@@ -62,31 +62,92 @@
If ifunc support is available, function pointers are statically
initialized to NULL, and we register resolver functions, e.g.,
_aes_encrypt_resolve, which call fat_init, and then return the
function pointer, e.g., the value of _aes_encrypt_vec.
_nettle_aes_encrypt_resolve, which call fat_init, and then return
the function pointer, e.g., the value of _nettle_aes_encrypt_vec.
If ifunc is not available, we have to define a wrapper function to
jump via the function pointer. (FIXME: For internal calls, we could
do this as a macro). We statically initialize each function pointer
to point to a special initialization function, e.g.,
_aes_encrypt_init, which calls fat_init, and then invokes the right
function. This way, all pointers are setup correctly at the first
call to any fat function.
_nettle_aes_encrypt_init, which calls fat_init, and then invokes
the right function. This way, all pointers are setup correctly at
the first call to any fat function.
*/
#if HAVE_LINK_IFUNC
# define IFUNC(resolve) __attribute__ ((ifunc (resolve)))
# define vec_init(f) NULL
# define FAT_BOILERPLATE()
#else
# define IFUNC(resolve)
# define vec_init(f) f##_init
#endif
#if HAVE_GCC_ATTRIBUTE
# define CONSTRUCTOR __attribute__ ((constructor))
#elif defined (__sun)
# pragma init(fat_init)
#else
# define CONSTRUCTOR
# if defined (__sun)
# pragma init(fat_init)
# endif
#endif
/* DECLARE_FAT_FUNC(name, ftype)
*
* name is the public function, e.g., _nettle_aes_encrypt.
* ftype is its type, e.g., aes_crypt_internal_func.
*
* DECLARE_FAT_VAR(name, type, var)
*
* name is name without _nettle prefix.
* type is its type.
* var is the variant, used as a suffix on the symbol name.
*
* DEFINE_FAT_FUNC(name, rtype, prototype, args)
*
* name is the public function.
* rtype its return type.
* prototype is the list of formal arguments, with types.
* args contain the argument list without any types.
*/
#if HAVE_LINK_IFUNC
#define DECLARE_FAT_FUNC(name, ftype) \
ftype name IFUNC(#name"_resolve"); \
static ftype *name##_vec = NULL;
#define DEFINE_FAT_FUNC(name, rtype, prototype, args) \
static void_func * name##_resolve(void) \
{ \
if (getenv ("NETTLE_FAT_VERBOSE")) \
fprintf (stderr, "libnettle: "#name"_resolve\n"); \
fat_init(); \
return (void_func *) name##_vec; \
}
#else /* !HAVE_LINK_IFUNC */
#define DECLARE_FAT_FUNC(name, ftype) \
ftype name; \
static ftype name##_init; \
static ftype *name##_vec = name##_init;
#define DEFINE_FAT_FUNC(name, rtype, prototype, args) \
rtype name prototype \
{ \
return name##_vec args; \
} \
static rtype name##_init prototype { \
if (getenv ("NETTLE_FAT_VERBOSE")) \
fprintf (stderr, "libnettle: "#name"_init\n"); \
fat_init(); \
assert (name##_vec != name##_init); \
return name##_vec args; \
}
#endif /* !HAVE_LINK_IFUNC */
#define DECLARE_FAT_FUNC_VAR(name, type, var) \
type _nettle_##name##_##var;
void _nettle_cpuid (uint32_t input, uint32_t regs[4]);
typedef void void_func (void);
......@@ -95,31 +156,19 @@ typedef void aes_crypt_internal_func (unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
size_t length, uint8_t *dst,
const uint8_t *src);
aes_crypt_internal_func _aes_encrypt IFUNC ("_aes_encrypt_resolve");
aes_crypt_internal_func _nettle_aes_encrypt_x86_64;
aes_crypt_internal_func _nettle_aes_encrypt_aesni;
DECLARE_FAT_FUNC(_nettle_aes_encrypt, aes_crypt_internal_func)
DECLARE_FAT_FUNC_VAR(aes_encrypt, aes_crypt_internal_func, x86_64)
DECLARE_FAT_FUNC_VAR(aes_encrypt, aes_crypt_internal_func, aesni)
aes_crypt_internal_func _aes_decrypt IFUNC ("_aes_decrypt_resolve");
aes_crypt_internal_func _nettle_aes_decrypt_x86_64;
aes_crypt_internal_func _nettle_aes_decrypt_aesni;
DECLARE_FAT_FUNC(_nettle_aes_decrypt, aes_crypt_internal_func)
DECLARE_FAT_FUNC_VAR(aes_decrypt, aes_crypt_internal_func, x86_64)
DECLARE_FAT_FUNC_VAR(aes_decrypt, aes_crypt_internal_func, aesni)
typedef void *(memxor_func)(void *dst_in, const void *src_in, size_t n);
typedef void *(memxor_func)(void *dst, const void *src, size_t n);
memxor_func nettle_memxor IFUNC ("_memxor_resolve");
memxor_func _nettle_memxor_x86_64;
memxor_func _nettle_memxor_sse2;
#if HAVE_LINK_IFUNC
#define _aes_encrypt_init NULL
#define _aes_decrypt_init NULL
#else
static aes_crypt_internal_func _aes_encrypt_init;
static aes_crypt_internal_func _aes_decrypt_init;
#endif
static aes_crypt_internal_func *_aes_encrypt_vec = _aes_encrypt_init;
static aes_crypt_internal_func *_aes_decrypt_vec = _aes_decrypt_init;
static memxor_func *_memxor_vec = _nettle_memxor_x86_64;
DECLARE_FAT_FUNC(nettle_memxor, memxor_func)
DECLARE_FAT_FUNC_VAR(memxor, memxor_func, x86_64)
DECLARE_FAT_FUNC_VAR(memxor, memxor_func, sse2)
/* This function should usually be called only once, at startup. But
it is idempotent, and on x86, pointer updates are atomic, so
......@@ -148,15 +197,15 @@ fat_init (void)
{
if (verbose)
fprintf (stderr, "libnettle: aes instructions available.\n");
_aes_encrypt_vec = _nettle_aes_encrypt_aesni;
_aes_decrypt_vec = _nettle_aes_decrypt_aesni;
_nettle_aes_encrypt_vec = _nettle_aes_encrypt_aesni;
_nettle_aes_decrypt_vec = _nettle_aes_decrypt_aesni;
}
else
{
if (verbose)
fprintf (stderr, "libnettle: aes instructions not available.\n");
_aes_encrypt_vec = _nettle_aes_encrypt_x86_64;
_aes_decrypt_vec = _nettle_aes_decrypt_x86_64;
_nettle_aes_encrypt_vec = _nettle_aes_encrypt_x86_64;
_nettle_aes_decrypt_vec = _nettle_aes_decrypt_x86_64;
}
_nettle_cpuid (0, cpuid_data);
......@@ -166,13 +215,13 @@ fat_init (void)
{
if (verbose)
fprintf (stderr, "libnettle: intel SSE2 will be used for XOR.\n");
_memxor_vec = _nettle_memxor_sse2;
nettle_memxor_vec = _nettle_memxor_sse2;
}
else
{
if (verbose)
fprintf (stderr, "libnettle: intel SSE2 will not be used for XOR.\n");
_memxor_vec = _nettle_memxor_x86_64;
nettle_memxor_vec = _nettle_memxor_x86_64;
}
/* The x86_64 architecture should always make stores visible in the
......@@ -181,87 +230,20 @@ fat_init (void)
initialized = 1;
}
#if HAVE_LINK_IFUNC
static void_func *
_aes_encrypt_resolve (void)
{
if (getenv ("NETTLE_FAT_VERBOSE"))
fprintf (stderr, "libnettle: _aes_encrypt_resolve\n");
fat_init ();
return (void_func *) _aes_encrypt_vec;
}
static void_func *
_aes_decrypt_resolve (void)
{
if (getenv ("NETTLE_FAT_VERBOSE"))
fprintf (stderr, "libnettle: _aes_decrypt_resolve\n");
fat_init ();
return (void_func *) _aes_decrypt_vec;
}
static void_func *
_memxor_resolve (void)
{
if (getenv ("NETTLE_FAT_VERBOSE"))
fprintf (stderr, "libnettle: _memxor_resolve\n");
fat_init ();
return (void_func *) _memxor_vec;
}
#else /* !HAVE_LINK_IFUNC */
/* We need wrapper functions jumping via the function pointer. */
void
_aes_encrypt (unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
size_t length, uint8_t *dst,
const uint8_t *src)
{
_aes_encrypt_vec (rounds, keys, T, length, dst, src);
}
static void
_aes_encrypt_init (unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
size_t length, uint8_t *dst,
const uint8_t *src)
{
if (getenv ("NETTLE_FAT_VERBOSE"))
fprintf (stderr, "libnettle: _aes_encrypt_init\n");
fat_init ();
assert (_aes_encrypt_vec != _aes_encrypt_init);
_aes_encrypt (rounds, keys, T, length, dst, src);
}
void
_aes_decrypt (unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
size_t length, uint8_t *dst,
const uint8_t *src)
{
_aes_decrypt_vec (rounds, keys, T, length, dst, src);
}
static void
_aes_decrypt_init (unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
size_t length, uint8_t *dst,
const uint8_t *src)
{
if (getenv ("NETTLE_FAT_VERBOSE"))
fprintf (stderr, "libnettle: _aes_decrypt_init\n");
fat_init ();
assert (_aes_decrypt_vec != _aes_decrypt_init);
_aes_decrypt (rounds, keys, T, length, dst, src);
}
/* FIXME: Missing _memxor_init. */
void *
memxor(void *dst_in, const void *src_in, size_t n)
{
return _memxor_vec (dst_in, src_in, n);
}
#endif /* !HAVE_LINK_IFUNC */
DEFINE_FAT_FUNC(_nettle_aes_encrypt, void,
(unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
size_t length, uint8_t *dst,
const uint8_t *src),
(rounds, keys, T, length, dst, src))
DEFINE_FAT_FUNC(_nettle_aes_decrypt, void,
(unsigned rounds, const uint32_t *keys,
const struct aes_table *T,
size_t length, uint8_t *dst,
const uint8_t *src),
(rounds, keys, T, length, dst, src))
DEFINE_FAT_FUNC(nettle_memxor, void *,
(void *dst, const void *src, size_t n),
(dst, src, n))
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment