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qemu/def-helper.h
Richard Henderson 2bece2c883 tcg: Optionally sign-extend 32-bit arguments for 64-bit hosts. 
Some hosts (amd64, ia64) have an ABI that ignores the high bits
of the 64-bit register when passing 32-bit arguments.  Others
require the value to be properly sign-extended for the type.
I.e. "int32_t" must be sign-extended and "uint32_t" must be
zero-extended to 64-bits.

To effect this, extend the "sizemask" parameter to tcg_gen_callN
to include the signedness of the type of each parameter.  If the
tcg target requires it, extend each 32-bit argument into a 64-bit
temp and pass that to the function call.

This ABI feature is required by sparc64, ppc64 and s390x.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-06-16 11:29:11 +02:00

241 lines
7.2 KiB
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/* Helper file for declaring TCG helper functions.
Should be included at the start and end of target-foo/helper.h.
Targets should use DEF_HELPER_N and DEF_HELPER_FLAGS_N to declare helper
functions. Names should be specified without the helper_ prefix, and
the return and argument types specified. 3 basic types are understood
(i32, i64 and ptr). Additional aliases are provided for convenience and
to match the types used by the C helper implementation.
The target helper.h should be included in all files that use/define
helper functions. THis will ensure that function prototypes are
consistent. In addition it should be included an extra two times for
helper.c, defining:
GEN_HELPER 1 to produce op generation functions (gen_helper_*)
GEN_HELPER 2 to do runtime registration helper functions.
*/
#ifndef DEF_HELPER_H
#define DEF_HELPER_H 1
#define HELPER(name) glue(helper_, name)
#define GET_TCGV_i32 GET_TCGV_I32
#define GET_TCGV_i64 GET_TCGV_I64
#define GET_TCGV_ptr GET_TCGV_PTR
/* Some types that make sense in C, but not for TCG. */
#define dh_alias_i32 i32
#define dh_alias_s32 i32
#define dh_alias_int i32
#define dh_alias_i64 i64
#define dh_alias_s64 i64
#define dh_alias_f32 i32
#define dh_alias_f64 i64
#if TARGET_LONG_BITS == 32
#define dh_alias_tl i32
#else
#define dh_alias_tl i64
#endif
#define dh_alias_ptr ptr
#define dh_alias_void void
#define dh_alias_env ptr
#define dh_alias(t) glue(dh_alias_, t)
#define dh_ctype_i32 uint32_t
#define dh_ctype_s32 int32_t
#define dh_ctype_int int
#define dh_ctype_i64 uint64_t
#define dh_ctype_s64 int64_t
#define dh_ctype_f32 float32
#define dh_ctype_f64 float64
#define dh_ctype_tl target_ulong
#define dh_ctype_ptr void *
#define dh_ctype_void void
#define dh_ctype_env CPUState *
#define dh_ctype(t) dh_ctype_##t
/* We can't use glue() here because it falls foul of C preprocessor
recursive expansion rules. */
#define dh_retvar_decl0_void void
#define dh_retvar_decl0_i32 TCGv_i32 retval
#define dh_retvar_decl0_i64 TCGv_i64 retval
#define dh_retvar_decl0_ptr TCGv_ptr retval
#define dh_retvar_decl0(t) glue(dh_retvar_decl0_, dh_alias(t))
#define dh_retvar_decl_void
#define dh_retvar_decl_i32 TCGv_i32 retval,
#define dh_retvar_decl_i64 TCGv_i64 retval,
#define dh_retvar_decl_ptr TCGv_ptr retval,
#define dh_retvar_decl(t) glue(dh_retvar_decl_, dh_alias(t))
#define dh_retvar_void TCG_CALL_DUMMY_ARG
#define dh_retvar_i32 GET_TCGV_i32(retval)
#define dh_retvar_i64 GET_TCGV_i64(retval)
#define dh_retvar_ptr GET_TCGV_ptr(retval)
#define dh_retvar(t) glue(dh_retvar_, dh_alias(t))
#define dh_is_64bit_void 0
#define dh_is_64bit_i32 0
#define dh_is_64bit_i64 1
#define dh_is_64bit_ptr (TCG_TARGET_REG_BITS == 64)
#define dh_is_64bit(t) glue(dh_is_64bit_, dh_alias(t))
#define dh_is_signed_void 0
#define dh_is_signed_i32 0
#define dh_is_signed_s32 1
#define dh_is_signed_i64 0
#define dh_is_signed_s64 1
#define dh_is_signed_f32 0
#define dh_is_signed_f64 0
#define dh_is_signed_tl 0
#define dh_is_signed_int 1
/* ??? This is highly specific to the host cpu. There are even special
extension instructions that may be required, e.g. ia64's addp4. But
for now we don't support any 64-bit targets with 32-bit pointers. */
#define dh_is_signed_ptr 0
#define dh_is_signed_env dh_is_signed_ptr
#define dh_is_signed(t) dh_is_signed_##t
#define dh_sizemask(t, n) \
sizemask |= dh_is_64bit(t) << (n*2); \
sizemask |= dh_is_signed(t) << (n*2+1)
#define dh_arg(t, n) \
args[n - 1] = glue(GET_TCGV_, dh_alias(t))(glue(arg, n)); \
dh_sizemask(t, n)
#define dh_arg_decl(t, n) glue(TCGv_, dh_alias(t)) glue(arg, n)
#define DEF_HELPER_0(name, ret) \
DEF_HELPER_FLAGS_0(name, 0, ret)
#define DEF_HELPER_1(name, ret, t1) \
DEF_HELPER_FLAGS_1(name, 0, ret, t1)
#define DEF_HELPER_2(name, ret, t1, t2) \
DEF_HELPER_FLAGS_2(name, 0, ret, t1, t2)
#define DEF_HELPER_3(name, ret, t1, t2, t3) \
DEF_HELPER_FLAGS_3(name, 0, ret, t1, t2, t3)
#define DEF_HELPER_4(name, ret, t1, t2, t3, t4) \
DEF_HELPER_FLAGS_4(name, 0, ret, t1, t2, t3, t4)
#endif /* DEF_HELPER_H */
#ifndef GEN_HELPER
/* Function prototypes. */
#define DEF_HELPER_FLAGS_0(name, flags, ret) \
dh_ctype(ret) HELPER(name) (void);
#define DEF_HELPER_FLAGS_1(name, flags, ret, t1) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1));
#define DEF_HELPER_FLAGS_2(name, flags, ret, t1, t2) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2));
#define DEF_HELPER_FLAGS_3(name, flags, ret, t1, t2, t3) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3));
#define DEF_HELPER_FLAGS_4(name, flags, ret, t1, t2, t3, t4) \
dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
dh_ctype(t4));
#undef GEN_HELPER
#define GEN_HELPER -1
#elif GEN_HELPER == 1
/* Gen functions. */
#define DEF_HELPER_FLAGS_0(name, flags, ret) \
static inline void glue(gen_helper_, name)(dh_retvar_decl0(ret)) \
{ \
int sizemask; \
sizemask = dh_is_64bit(ret); \
tcg_gen_helperN(HELPER(name), flags, sizemask, dh_retvar(ret), 0, NULL); \
}
#define DEF_HELPER_FLAGS_1(name, flags, ret, t1) \
static inline void glue(gen_helper_, name)(dh_retvar_decl(ret) dh_arg_decl(t1, 1)) \
{ \
TCGArg args[1]; \
int sizemask = 0; \
dh_sizemask(ret, 0); \
dh_arg(t1, 1); \
tcg_gen_helperN(HELPER(name), flags, sizemask, dh_retvar(ret), 1, args); \
}
#define DEF_HELPER_FLAGS_2(name, flags, ret, t1, t2) \
static inline void glue(gen_helper_, name)(dh_retvar_decl(ret) dh_arg_decl(t1, 1), \
dh_arg_decl(t2, 2)) \
{ \
TCGArg args[2]; \
int sizemask = 0; \
dh_sizemask(ret, 0); \
dh_arg(t1, 1); \
dh_arg(t2, 2); \
tcg_gen_helperN(HELPER(name), flags, sizemask, dh_retvar(ret), 2, args); \
}
#define DEF_HELPER_FLAGS_3(name, flags, ret, t1, t2, t3) \
static inline void glue(gen_helper_, name)(dh_retvar_decl(ret) dh_arg_decl(t1, 1), \
dh_arg_decl(t2, 2), dh_arg_decl(t3, 3)) \
{ \
TCGArg args[3]; \
int sizemask = 0; \
dh_sizemask(ret, 0); \
dh_arg(t1, 1); \
dh_arg(t2, 2); \
dh_arg(t3, 3); \
tcg_gen_helperN(HELPER(name), flags, sizemask, dh_retvar(ret), 3, args); \
}
#define DEF_HELPER_FLAGS_4(name, flags, ret, t1, t2, t3, t4) \
static inline void glue(gen_helper_, name)(dh_retvar_decl(ret) dh_arg_decl(t1, 1), \
dh_arg_decl(t2, 2), dh_arg_decl(t3, 3), dh_arg_decl(t4, 4)) \
{ \
TCGArg args[4]; \
int sizemask = 0; \
dh_sizemask(ret, 0); \
dh_arg(t1, 1); \
dh_arg(t2, 2); \
dh_arg(t3, 3); \
dh_arg(t4, 4); \
tcg_gen_helperN(HELPER(name), flags, sizemask, dh_retvar(ret), 4, args); \
}
#undef GEN_HELPER
#define GEN_HELPER -1
#elif GEN_HELPER == 2
/* Register helpers. */
#define DEF_HELPER_FLAGS_0(name, flags, ret) \
tcg_register_helper(HELPER(name), #name);
#define DEF_HELPER_FLAGS_1(name, flags, ret, t1) \
DEF_HELPER_FLAGS_0(name, flags, ret)
#define DEF_HELPER_FLAGS_2(name, flags, ret, t1, t2) \
DEF_HELPER_FLAGS_0(name, flags, ret)
#define DEF_HELPER_FLAGS_3(name, flags, ret, t1, t2, t3) \
DEF_HELPER_FLAGS_0(name, flags, ret)
#define DEF_HELPER_FLAGS_4(name, flags, ret, t1, t2, t3, t4) \
DEF_HELPER_FLAGS_0(name, flags, ret)
#undef GEN_HELPER
#define GEN_HELPER -1
#elif GEN_HELPER == -1
/* Undefine macros. */
#undef DEF_HELPER_FLAGS_0
#undef DEF_HELPER_FLAGS_1
#undef DEF_HELPER_FLAGS_2
#undef DEF_HELPER_FLAGS_3
#undef DEF_HELPER_FLAGS_4
#undef GEN_HELPER
#endif
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