489 lines
27 KiB
C
489 lines
27 KiB
C
/* TCC ARM runtime EABI
|
|
Copyright (C) 2013 Thomas Preud'homme
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.*/
|
|
|
|
#include <limits.h>
|
|
|
|
/* We rely on the little endianness and EABI calling convention for this to
|
|
work */
|
|
|
|
typedef struct double_unsigned_struct {
|
|
unsigned low;
|
|
unsigned high;
|
|
} double_unsigned_struct;
|
|
|
|
typedef struct unsigned_int_struct {
|
|
unsigned low;
|
|
int high;
|
|
} unsigned_int_struct;
|
|
|
|
#define REGS_RETURN(name, type) \
|
|
void name ## _return(type ret) {}
|
|
|
|
|
|
/* Float helper functions */
|
|
|
|
#define FLOAT_EXP_BITS 8
|
|
#define FLOAT_FRAC_BITS 23
|
|
|
|
#define DOUBLE_EXP_BITS 11
|
|
#define DOUBLE_FRAC_BITS 52
|
|
|
|
#define ONE_EXP(type) ((1 << (type ## _EXP_BITS - 1)) - 1)
|
|
|
|
REGS_RETURN(unsigned_int_struct, unsigned_int_struct)
|
|
REGS_RETURN(double_unsigned_struct, double_unsigned_struct)
|
|
|
|
/* float -> integer: (sign) 1.fraction x 2^(exponent - exp_for_one) */
|
|
|
|
|
|
/* float to [unsigned] long long conversion */
|
|
#define DEFINE__AEABI_F2XLZ(name, with_sign) \
|
|
void __aeabi_ ## name(unsigned val) \
|
|
{ \
|
|
int exp, high_shift, sign; \
|
|
double_unsigned_struct ret; \
|
|
\
|
|
/* compute sign */ \
|
|
sign = val >> 31; \
|
|
\
|
|
/* compute real exponent */ \
|
|
exp = val >> FLOAT_FRAC_BITS; \
|
|
exp &= (1 << FLOAT_EXP_BITS) - 1; \
|
|
exp -= ONE_EXP(FLOAT); \
|
|
\
|
|
/* undefined behavior if truncated value cannot be represented */ \
|
|
if (with_sign) { \
|
|
if (exp > 62) /* |val| too big, double cannot represent LLONG_MAX */ \
|
|
return; \
|
|
} else { \
|
|
if ((sign && exp >= 0) || exp > 63) /* if val < 0 || val too big */ \
|
|
return; \
|
|
} \
|
|
\
|
|
val &= (1 << FLOAT_FRAC_BITS) - 1; \
|
|
if (exp >= 32) { \
|
|
ret.high = 1 << (exp - 32); \
|
|
if (exp - 32 >= FLOAT_FRAC_BITS) { \
|
|
ret.high |= val << (exp - 32 - FLOAT_FRAC_BITS); \
|
|
ret.low = 0; \
|
|
} else { \
|
|
high_shift = FLOAT_FRAC_BITS - (exp - 32); \
|
|
ret.high |= val >> high_shift; \
|
|
ret.low = val << (32 - high_shift); \
|
|
} \
|
|
} else { \
|
|
ret.high = 0; \
|
|
ret.low = 1 << exp; \
|
|
if (exp > FLOAT_FRAC_BITS) \
|
|
ret.low |= val << (exp - FLOAT_FRAC_BITS); \
|
|
else \
|
|
ret.low |= val >> (FLOAT_FRAC_BITS - exp); \
|
|
} \
|
|
\
|
|
/* encode negative integer using 2's complement */ \
|
|
if (with_sign && sign) { \
|
|
ret.low = ~ret.low; \
|
|
ret.high = ~ret.high; \
|
|
if (ret.low == UINT_MAX) { \
|
|
ret.low = 0; \
|
|
ret.high++; \
|
|
} else \
|
|
ret.low++; \
|
|
} \
|
|
\
|
|
double_unsigned_struct_return(ret); \
|
|
}
|
|
|
|
/* float to unsigned long long conversion */
|
|
DEFINE__AEABI_F2XLZ(f2ulz, 0)
|
|
|
|
/* float to long long conversion */
|
|
DEFINE__AEABI_F2XLZ(f2lz, 1)
|
|
|
|
/* double to [unsigned] long long conversion */
|
|
#define DEFINE__AEABI_D2XLZ(name, with_sign) \
|
|
void __aeabi_ ## name(double_unsigned_struct val) \
|
|
{ \
|
|
int exp, high_shift, sign; \
|
|
double_unsigned_struct ret; \
|
|
\
|
|
/* compute sign */ \
|
|
sign = val.high >> 31; \
|
|
\
|
|
/* compute real exponent */ \
|
|
exp = (val.high >> (DOUBLE_FRAC_BITS - 32)); \
|
|
exp &= (1 << DOUBLE_EXP_BITS) - 1; \
|
|
exp -= ONE_EXP(DOUBLE); \
|
|
\
|
|
/* undefined behavior if truncated value cannot be represented */ \
|
|
if (with_sign) { \
|
|
if (exp > 62) /* |val| too big, double cannot represent LLONG_MAX */ \
|
|
return; \
|
|
} else { \
|
|
if ((sign && exp >= 0) || exp > 63) /* if val < 0 || val too big */ \
|
|
return; \
|
|
} \
|
|
\
|
|
val.high &= (1 << (DOUBLE_FRAC_BITS - 32)) - 1; \
|
|
if (exp >= 32) { \
|
|
ret.high = 1 << (exp - 32); \
|
|
if (exp >= DOUBLE_FRAC_BITS) { \
|
|
high_shift = exp - DOUBLE_FRAC_BITS; \
|
|
ret.high |= val.high << high_shift; \
|
|
ret.high |= val.low >> (32 - high_shift); \
|
|
ret.low = val.low << high_shift; \
|
|
} else { \
|
|
high_shift = DOUBLE_FRAC_BITS - exp; \
|
|
ret.high |= val.high >> high_shift; \
|
|
ret.low = val.high << (32 - high_shift); \
|
|
ret.low |= val.low >> high_shift; \
|
|
} \
|
|
} else { \
|
|
ret.high = 0; \
|
|
ret.low = 1 << exp; \
|
|
if (exp > DOUBLE_FRAC_BITS - 32) { \
|
|
high_shift = exp - DOUBLE_FRAC_BITS - 32; \
|
|
ret.low |= val.high << high_shift; \
|
|
ret.low |= val.low >> (32 - high_shift); \
|
|
} else \
|
|
ret.low |= val.high >> (DOUBLE_FRAC_BITS - 32 - exp); \
|
|
} \
|
|
\
|
|
/* encode negative integer using 2's complement */ \
|
|
if (with_sign && sign) { \
|
|
ret.low = ~ret.low; \
|
|
ret.high = ~ret.high; \
|
|
if (ret.low == UINT_MAX) { \
|
|
ret.low = 0; \
|
|
ret.high++; \
|
|
} else \
|
|
ret.low++; \
|
|
} \
|
|
\
|
|
double_unsigned_struct_return(ret); \
|
|
}
|
|
|
|
/* double to unsigned long long conversion */
|
|
DEFINE__AEABI_D2XLZ(d2ulz, 0)
|
|
|
|
/* double to long long conversion */
|
|
DEFINE__AEABI_D2XLZ(d2lz, 1)
|
|
|
|
/* long long to float conversion */
|
|
#define DEFINE__AEABI_XL2F(name, with_sign) \
|
|
unsigned __aeabi_ ## name(unsigned long long v) \
|
|
{ \
|
|
int s /* shift */, flb /* first lost bit */, sign = 0; \
|
|
unsigned p = 0 /* power */, ret; \
|
|
double_unsigned_struct val; \
|
|
\
|
|
/* fraction in negative float is encoded in 1's complement */ \
|
|
if (with_sign && (v & (1ULL << 63))) { \
|
|
sign = 1; \
|
|
v = ~v + 1; \
|
|
} \
|
|
val.low = v; \
|
|
val.high = v >> 32; \
|
|
/* fill fraction bits */ \
|
|
for (s = 31, p = 1 << 31; p && !(val.high & p); s--, p >>= 1); \
|
|
if (p) { \
|
|
ret = val.high & (p - 1); \
|
|
if (s < FLOAT_FRAC_BITS) { \
|
|
ret <<= FLOAT_FRAC_BITS - s; \
|
|
ret |= val.low >> (32 - (FLOAT_FRAC_BITS - s)); \
|
|
flb = (val.low >> (32 - (FLOAT_FRAC_BITS - s - 1))) & 1; \
|
|
} else { \
|
|
flb = (ret >> (s - FLOAT_FRAC_BITS - 1)) & 1; \
|
|
ret >>= s - FLOAT_FRAC_BITS; \
|
|
} \
|
|
s += 32; \
|
|
} else { \
|
|
for (s = 31, p = 1 << 31; p && !(val.low & p); s--, p >>= 1); \
|
|
if (p) { \
|
|
ret = val.low & (p - 1); \
|
|
if (s <= FLOAT_FRAC_BITS) { \
|
|
ret <<= FLOAT_FRAC_BITS - s; \
|
|
flb = 0; \
|
|
} else { \
|
|
flb = (ret >> (s - FLOAT_FRAC_BITS - 1)) & 1; \
|
|
ret >>= s - FLOAT_FRAC_BITS; \
|
|
} \
|
|
} else \
|
|
return 0; \
|
|
} \
|
|
if (flb) \
|
|
ret++; \
|
|
\
|
|
/* fill exponent bits */ \
|
|
ret |= (s + ONE_EXP(FLOAT)) << FLOAT_FRAC_BITS; \
|
|
\
|
|
/* fill sign bit */ \
|
|
ret |= sign << 31; \
|
|
\
|
|
return ret; \
|
|
}
|
|
|
|
/* unsigned long long to float conversion */
|
|
DEFINE__AEABI_XL2F(ul2f, 0)
|
|
|
|
/* long long to float conversion */
|
|
DEFINE__AEABI_XL2F(l2f, 1)
|
|
|
|
/* long long to double conversion */
|
|
#define __AEABI_XL2D(name, with_sign) \
|
|
void __aeabi_ ## name(unsigned long long v) \
|
|
{ \
|
|
int s /* shift */, high_shift, sign = 0; \
|
|
unsigned tmp, p = 0; \
|
|
double_unsigned_struct val, ret; \
|
|
\
|
|
/* fraction in negative float is encoded in 1's complement */ \
|
|
if (with_sign && (v & (1ULL << 63))) { \
|
|
sign = 1; \
|
|
v = ~v + 1; \
|
|
} \
|
|
val.low = v; \
|
|
val.high = v >> 32; \
|
|
\
|
|
/* fill fraction bits */ \
|
|
for (s = 31, p = 1 << 31; p && !(val.high & p); s--, p >>= 1); \
|
|
if (p) { \
|
|
tmp = val.high & (p - 1); \
|
|
if (s < DOUBLE_FRAC_BITS - 32) { \
|
|
high_shift = DOUBLE_FRAC_BITS - 32 - s; \
|
|
ret.high = tmp << high_shift; \
|
|
ret.high |= val.low >> (32 - high_shift); \
|
|
ret.low = val.low << high_shift; \
|
|
} else { \
|
|
high_shift = s - (DOUBLE_FRAC_BITS - 32); \
|
|
ret.high = tmp >> high_shift; \
|
|
ret.low = tmp << (32 - high_shift); \
|
|
ret.low |= val.low >> high_shift; \
|
|
if ((val.low >> (high_shift - 1)) & 1) { \
|
|
if (ret.low == UINT_MAX) { \
|
|
ret.high++; \
|
|
ret.low = 0; \
|
|
} else \
|
|
ret.low++; \
|
|
} \
|
|
} \
|
|
s += 32; \
|
|
} else { \
|
|
for (s = 31, p = 1 << 31; p && !(val.low & p); s--, p >>= 1); \
|
|
if (p) { \
|
|
tmp = val.low & (p - 1); \
|
|
if (s <= DOUBLE_FRAC_BITS - 32) { \
|
|
high_shift = DOUBLE_FRAC_BITS - 32 - s; \
|
|
ret.high = tmp << high_shift; \
|
|
ret.low = 0; \
|
|
} else { \
|
|
high_shift = s - (DOUBLE_FRAC_BITS - 32); \
|
|
ret.high = tmp >> high_shift; \
|
|
ret.low = tmp << (32 - high_shift); \
|
|
} \
|
|
} else { \
|
|
ret.high = ret.low = 0; \
|
|
double_unsigned_struct_return(ret); \
|
|
} \
|
|
} \
|
|
\
|
|
/* fill exponent bits */ \
|
|
ret.high |= (s + ONE_EXP(DOUBLE)) << (DOUBLE_FRAC_BITS - 32); \
|
|
\
|
|
/* fill sign bit */ \
|
|
ret.high |= sign << 31; \
|
|
\
|
|
double_unsigned_struct_return(ret); \
|
|
}
|
|
|
|
/* unsigned long long to double conversion */
|
|
__AEABI_XL2D(ul2d, 0)
|
|
|
|
/* long long to double conversion */
|
|
__AEABI_XL2D(l2d, 1)
|
|
|
|
|
|
/* Long long helper functions */
|
|
|
|
/* TODO: add error in case of den == 0 (see §4.3.1 and §4.3.2) */
|
|
|
|
#define define_aeabi_xdivmod_signed_type(basetype, type) \
|
|
typedef struct type { \
|
|
basetype quot; \
|
|
unsigned basetype rem; \
|
|
} type
|
|
|
|
#define define_aeabi_xdivmod_unsigned_type(basetype, type) \
|
|
typedef struct type { \
|
|
basetype quot; \
|
|
basetype rem; \
|
|
} type
|
|
|
|
#define AEABI_UXDIVMOD(name,type, rettype, typemacro) \
|
|
static inline rettype aeabi_ ## name (type num, type den) \
|
|
{ \
|
|
rettype ret; \
|
|
type quot = 0; \
|
|
\
|
|
/* Increase quotient while it is less than numerator */ \
|
|
while (num >= den) { \
|
|
type q = 1; \
|
|
\
|
|
/* Find closest power of two */ \
|
|
while ((q << 1) * den <= num && q * den <= typemacro ## _MAX / 2) \
|
|
q <<= 1; \
|
|
\
|
|
/* Compute difference between current quotient and numerator */ \
|
|
num -= q * den; \
|
|
quot += q; \
|
|
} \
|
|
ret.quot = quot; \
|
|
ret.rem = num; \
|
|
return ret; \
|
|
}
|
|
|
|
#define __AEABI_XDIVMOD(name, type, uiname, rettype, urettype, typemacro) \
|
|
void __aeabi_ ## name(type numerator, type denominator) \
|
|
{ \
|
|
unsigned type num, den; \
|
|
urettype uxdiv_ret; \
|
|
rettype ret; \
|
|
\
|
|
if (numerator >= 0) \
|
|
num = numerator; \
|
|
else \
|
|
num = 0 - numerator; \
|
|
if (denominator >= 0) \
|
|
den = denominator; \
|
|
else \
|
|
den = 0 - denominator; \
|
|
uxdiv_ret = aeabi_ ## uiname(num, den); \
|
|
/* signs differ */ \
|
|
if ((numerator & typemacro ## _MIN) != (denominator & typemacro ## _MIN)) \
|
|
ret.quot = 0 - uxdiv_ret.quot; \
|
|
else \
|
|
ret.quot = uxdiv_ret.quot; \
|
|
if (numerator < 0) \
|
|
ret.rem = 0 - uxdiv_ret.rem; \
|
|
else \
|
|
ret.rem = uxdiv_ret.rem; \
|
|
\
|
|
rettype ## _return(ret); \
|
|
}
|
|
|
|
define_aeabi_xdivmod_signed_type(long long, lldiv_t);
|
|
define_aeabi_xdivmod_unsigned_type(unsigned long long, ulldiv_t);
|
|
define_aeabi_xdivmod_signed_type(int, idiv_t);
|
|
define_aeabi_xdivmod_unsigned_type(unsigned, uidiv_t);
|
|
|
|
REGS_RETURN(lldiv_t, lldiv_t)
|
|
REGS_RETURN(ulldiv_t, ulldiv_t)
|
|
REGS_RETURN(idiv_t, idiv_t)
|
|
REGS_RETURN(uidiv_t, uidiv_t)
|
|
|
|
AEABI_UXDIVMOD(uldivmod, unsigned long long, ulldiv_t, ULONG)
|
|
|
|
__AEABI_XDIVMOD(ldivmod, long long, uldivmod, lldiv_t, ulldiv_t, LLONG)
|
|
|
|
void __aeabi_uldivmod(unsigned long long num, unsigned long long den)
|
|
{
|
|
ulldiv_t_return(aeabi_uldivmod(num, den));
|
|
}
|
|
|
|
void __aeabi_llsl(double_unsigned_struct val, int shift)
|
|
{
|
|
double_unsigned_struct ret;
|
|
|
|
if (shift >= 32) {
|
|
val.high = val.low;
|
|
val.low = 0;
|
|
shift -= 32;
|
|
}
|
|
if (shift > 0) {
|
|
ret.low = val.low << shift;
|
|
ret.high = (val.high << shift) | (val.low >> (32 - shift));
|
|
double_unsigned_struct_return(ret);
|
|
return;
|
|
}
|
|
double_unsigned_struct_return(val);
|
|
}
|
|
|
|
#define aeabi_lsr(val, shift, fill, type) \
|
|
type ## _struct ret; \
|
|
\
|
|
if (shift >= 32) { \
|
|
val.low = val.high; \
|
|
val.high = fill; \
|
|
shift -= 32; \
|
|
} \
|
|
if (shift > 0) { \
|
|
ret.high = val.high >> shift; \
|
|
ret.low = (val.high << (32 - shift)) | (val.low >> shift); \
|
|
type ## _struct_return(ret); \
|
|
return; \
|
|
} \
|
|
type ## _struct_return(val);
|
|
|
|
void __aeabi_llsr(double_unsigned_struct val, int shift)
|
|
{
|
|
aeabi_lsr(val, shift, 0, double_unsigned);
|
|
}
|
|
|
|
void __aeabi_lasr(unsigned_int_struct val, int shift)
|
|
{
|
|
aeabi_lsr(val, shift, val.high >> 31, unsigned_int);
|
|
}
|
|
|
|
|
|
/* Integer division functions */
|
|
|
|
AEABI_UXDIVMOD(uidivmod, unsigned, uidiv_t, UINT)
|
|
|
|
int __aeabi_idiv(int numerator, int denominator)
|
|
{
|
|
unsigned num, den;
|
|
uidiv_t ret;
|
|
|
|
if (numerator >= 0)
|
|
num = numerator;
|
|
else
|
|
num = 0 - numerator;
|
|
if (denominator >= 0)
|
|
den = denominator;
|
|
else
|
|
den = 0 - denominator;
|
|
ret = aeabi_uidivmod(num, den);
|
|
if ((numerator & INT_MIN) != (denominator & INT_MIN)) /* signs differ */
|
|
ret.quot *= -1;
|
|
return ret.quot;
|
|
}
|
|
|
|
unsigned __aeabi_uidiv(unsigned num, unsigned den)
|
|
{
|
|
return aeabi_uidivmod(num, den).quot;
|
|
}
|
|
|
|
__AEABI_XDIVMOD(idivmod, int, uidivmod, idiv_t, uidiv_t, INT)
|
|
|
|
void __aeabi_uidivmod(unsigned num, unsigned den)
|
|
{
|
|
uidiv_t_return(aeabi_uidivmod(num, den));
|
|
}
|