Add RISC-V port for newlib

Contributor list:
    - Andrew Waterman  <andrew@sifive.com>
    - Palmer Dabbelt  <palmer@dabbelt.com>
    - Kito Cheng  <kito.cheng@gmail.com>
    - Scott Beamer  <sbeamer@eecs.berkeley.edu>
This commit is contained in:
Kito Cheng 2017-07-27 16:44:22 +08:00 committed by Jeff Johnston
parent 7e69f983a4
commit 363dbb9e44
25 changed files with 7198 additions and 2 deletions

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@ -1133,3 +1133,16 @@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(49) - SiFive Inc. (riscv-* targets)
Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.

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@ -255,6 +255,12 @@ case "${host_cpu}" in
powerpc*) powerpc*)
machine_dir=powerpc machine_dir=powerpc
;; ;;
riscv*)
libm_machine_dir=riscv
machine_dir=riscv
newlib_cflags="${newlib_cflags}"
default_newlib_atexit_dynamic_alloc="no"
;;
rl78) rl78)
machine_dir=rl78 machine_dir=rl78
newlib_cflags="${newlib_cflags} -DPREFER_SIZE_OVER_SPEED -DSMALL_MEMORY" newlib_cflags="${newlib_cflags} -DPREFER_SIZE_OVER_SPEED -DSMALL_MEMORY"
@ -806,6 +812,9 @@ case "${host}" in
newlib_cflags="${newlib_cflags} -DHAVE_OPENDIR -DHAVE_RENAME -DHAVE_FCNTL -D_NO_POSIX_SPAWN" newlib_cflags="${newlib_cflags} -DHAVE_OPENDIR -DHAVE_RENAME -DHAVE_FCNTL -D_NO_POSIX_SPAWN"
syscall_dir=syscalls syscall_dir=syscalls
;; ;;
riscv*-*-*)
syscall_dir=syscalls
;;
sh*-*-*) sh*-*-*)
default_newlib_io_long_long="yes" default_newlib_io_long_long="yes"
syscall_dir=syscalls syscall_dir=syscalls

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@ -170,6 +170,10 @@
#define __IEEE_LITTLE_ENDIAN #define __IEEE_LITTLE_ENDIAN
#endif #endif
#ifdef __riscv
#define __IEEE_LITTLE_ENDIAN
#endif
#ifdef __i960__ #ifdef __i960__
#define __IEEE_LITTLE_ENDIAN #define __IEEE_LITTLE_ENDIAN
#endif #endif

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@ -358,6 +358,15 @@ _BEGIN_STD_C
#define _JBLEN 12 #define _JBLEN 12
#endif #endif
#ifdef __riscv
#define _JBTYPE long
#ifdef __riscv_32e
#define _JBLEN ((4*sizeof(long))/sizeof(long))
#else
#define _JBLEN ((14*sizeof(long) + 12*sizeof(double))/sizeof(long))
#endif
#endif
#ifdef _JBLEN #ifdef _JBLEN
#ifdef _JBTYPE #ifdef _JBTYPE
typedef _JBTYPE jmp_buf[_JBLEN]; typedef _JBTYPE jmp_buf[_JBLEN];

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@ -1,7 +1,7 @@
#ifndef _MACHTIME_H_ #ifndef _MACHTIME_H_
#define _MACHTIME_H_ #define _MACHTIME_H_
#if defined(__rtems__) || defined(__VISIUM__) #if defined(__rtems__) || defined(__VISIUM__) || defined(__riscv)
#define _CLOCKS_PER_SEC_ 1000000 #define _CLOCKS_PER_SEC_ 1000000
#elif defined(__aarch64__) || defined(__arm__) || defined(__thumb__) #elif defined(__aarch64__) || defined(__arm__) || defined(__thumb__)
#define _CLOCKS_PER_SEC_ 100 #define _CLOCKS_PER_SEC_ 100

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@ -75,7 +75,7 @@
#define _POINTER_INT short #define _POINTER_INT short
#endif #endif
#if defined(__m68k__) || defined(__mc68000__) #if defined(__m68k__) || defined(__mc68000__) || defined(__riscv)
#define _READ_WRITE_RETURN_TYPE _ssize_t #define _READ_WRITE_RETURN_TYPE _ssize_t
#endif #endif

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@ -813,6 +813,7 @@ m88k
mep mep
microblaze microblaze
mips mips
riscv
mn10200 mn10200
mn10300 mn10300
moxie moxie
@ -11888,6 +11889,8 @@ subdirs="$subdirs a29k"
microblaze ) subdirs="$subdirs microblaze" microblaze ) subdirs="$subdirs microblaze"
;; ;;
mips) subdirs="$subdirs mips" mips) subdirs="$subdirs mips"
;;
riscv) subdirs="$subdirs riscv"
;; ;;
mn10200) subdirs="$subdirs mn10200" mn10200) subdirs="$subdirs mn10200"
;; ;;

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@ -52,6 +52,7 @@ if test -n "${machine_dir}"; then
mep ) AC_CONFIG_SUBDIRS(mep) ;; mep ) AC_CONFIG_SUBDIRS(mep) ;;
microblaze ) AC_CONFIG_SUBDIRS(microblaze) ;; microblaze ) AC_CONFIG_SUBDIRS(microblaze) ;;
mips) AC_CONFIG_SUBDIRS(mips) ;; mips) AC_CONFIG_SUBDIRS(mips) ;;
riscv) AC_CONFIG_SUBDIRS(riscv) ;;
mn10200) AC_CONFIG_SUBDIRS(mn10200) ;; mn10200) AC_CONFIG_SUBDIRS(mn10200) ;;
mn10300) AC_CONFIG_SUBDIRS(mn10300) ;; mn10300) AC_CONFIG_SUBDIRS(mn10300) ;;
moxie) AC_CONFIG_SUBDIRS(moxie) ;; moxie) AC_CONFIG_SUBDIRS(moxie) ;;

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@ -0,0 +1,16 @@
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ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
CONFIG_STATUS_DEPENDENCIES = $(newlib_basedir)/configure.host

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install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
install; \
else \
$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
"INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
fi
mostlyclean-generic:
clean-generic:
distclean-generic:
-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
maintainer-clean-generic:
@echo "This command is intended for maintainers to use"
@echo "it deletes files that may require special tools to rebuild."
clean: clean-am
clean-am: clean-generic clean-noinstLIBRARIES mostlyclean-am
distclean: distclean-am
-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-rm -f Makefile
distclean-am: clean-am distclean-compile distclean-generic \
distclean-tags
dvi: dvi-am
dvi-am:
html: html-am
html-am:
info: info-am
info-am:
install-data-am:
install-dvi: install-dvi-am
install-dvi-am:
install-exec-am:
install-html: install-html-am
install-html-am:
install-info: install-info-am
install-info-am:
install-man:
install-pdf: install-pdf-am
install-pdf-am:
install-ps: install-ps-am
install-ps-am:
installcheck-am:
maintainer-clean: maintainer-clean-am
-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-rm -rf $(top_srcdir)/autom4te.cache
-rm -f Makefile
maintainer-clean-am: distclean-am maintainer-clean-generic
mostlyclean: mostlyclean-am
mostlyclean-am: mostlyclean-compile mostlyclean-generic
pdf: pdf-am
pdf-am:
ps: ps-am
ps-am:
uninstall-am:
.MAKE: install-am install-strip
.PHONY: CTAGS GTAGS all all-am am--refresh check check-am clean \
clean-generic clean-noinstLIBRARIES ctags distclean \
distclean-compile distclean-generic distclean-tags dvi dvi-am \
html html-am info info-am install install-am install-data \
install-data-am install-dvi install-dvi-am install-exec \
install-exec-am install-html install-html-am install-info \
install-info-am install-man install-pdf install-pdf-am \
install-ps install-ps-am install-strip installcheck \
installcheck-am installdirs maintainer-clean \
maintainer-clean-generic mostlyclean mostlyclean-compile \
mostlyclean-generic pdf pdf-am ps ps-am tags uninstall \
uninstall-am
# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:

1012
newlib/libc/machine/riscv/aclocal.m4 vendored Normal file

File diff suppressed because it is too large Load Diff

4748
newlib/libc/machine/riscv/configure vendored Executable file

File diff suppressed because it is too large Load Diff

View File

@ -0,0 +1,14 @@
dnl This is the newlib/libc/machine/mips configure.in file.
dnl Process this file with autoconf to produce a configure script.
AC_PREREQ(2.59)
AC_INIT([newlib],[NEWLIB_VERSION])
AC_CONFIG_SRCDIR([memset.S])
dnl Can't be done in NEWLIB_CONFIGURE because that confuses automake.
AC_CONFIG_AUX_DIR(../../../..)
NEWLIB_CONFIGURE(../../..)
AC_CONFIG_FILES([Makefile])
AC_OUTPUT

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@ -0,0 +1,32 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#include <strings.h>
int
ffs (int word)
{
#if __riscv_xlen == 32
return (__builtin_ffs (word));
#else
int i;
if (!word)
return 0;
i = 0;
for (;;)
{
if (((1 << i++) & word) != 0)
return i;
}
return 0;
#endif
}

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@ -0,0 +1,110 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#include <ieeefp.h>
#ifdef __riscv_flen
static void
fssr(unsigned value)
{
asm volatile ("fssr %0" :: "r"(value));
}
static unsigned
frsr()
{
unsigned value;
asm volatile ("frsr %0" : "=r" (value));
return value;
}
static fp_rnd
frm_fp_rnd (unsigned frm)
{
switch (frm)
{
case 0: return FP_RN;
case 1: return FP_RZ;
case 2: return FP_RM;
case 3: return FP_RP;
/* 4 ~ 7 is invalid value, so just retun FP_RP. */
default:return FP_RP;
}
}
#endif /* __riscv_flen */
fp_except
fpgetmask(void)
{
return 0;
}
fp_rnd
fpgetround(void)
{
#ifdef __riscv_flen
unsigned rm = (frsr () >> 5) & 0x7;
return frm_fp_rnd (rm);
#else
return FP_RZ;
#endif /* __riscv_flen */
}
fp_except
fpgetsticky(void)
{
#ifdef __riscv_flen
return frsr () & 0x1f;
#else
return 0;
#endif /* __riscv_flen */
}
fp_except
fpsetmask(fp_except mask)
{
return -1;
}
fp_rnd
fpsetround(fp_rnd rnd_dir)
{
#ifdef __riscv_flen
unsigned fsr = frsr ();
unsigned rm = (fsr >> 5) & 0x7;
unsigned new_rm;
switch (rnd_dir)
{
case FP_RN: new_rm = 0;
case FP_RZ: new_rm = 1;
case FP_RM: new_rm = 2;
case FP_RP: new_rm = 3;
default: return -1;
}
fssr (new_rm << 5 | fsr & 0x1f);
return frm_fp_rnd (rm);
#else
return -1;
#endif /* __riscv_flen */
}
fp_except
fpsetsticky(fp_except sticky)
{
#ifdef __riscv_flen
unsigned fsr = frsr ();
fssr (sticky & 0x1f | fsr & ~0x1f);
return fsr & 0x1f;
#else
return -1;
#endif /* __riscv_flen */
}

View File

@ -0,0 +1,42 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#ifndef _FENV_H
#define _FENV_H
#include <sys/fenv.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Exception */
int feclearexcept(int excepts);
int fegetexceptflag(fexcept_t *flagp, int excepts);
int feraiseexcept(int excepts);
int fesetexceptflag(const fexcept_t *flagp, int excepts);
int fetestexcept(int excepts);
/* Rounding mode */
int fegetround(void);
int fesetround(int rounding_mode);
/* Float environment */
int fegetenv(fenv_t *envp);
int feholdexcept(fenv_t *envp);
int fesetenv(const fenv_t *envp);
int feupdateenv(const fenv_t *envp);
#ifdef __cplusplus
}
#endif
#endif

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@ -0,0 +1,81 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#include <string.h>
#include <stdint.h>
#define unlikely(X) __builtin_expect (!!(X), 0)
void *
memcpy(void *__restrict aa, const void *__restrict bb, size_t n)
{
#define BODY(a, b, t) { \
t tt = *b; \
a++, b++; \
*(a - 1) = tt; \
}
char *a = (char *)aa;
const char *b = (const char *)bb;
char *end = a + n;
uintptr_t msk = sizeof (long) - 1;
if (unlikely ((((uintptr_t)a & msk) != ((uintptr_t)b & msk))
|| n < sizeof (long)))
{
small:
if (__builtin_expect (a < end, 1))
while (a < end)
BODY (a, b, char);
return aa;
}
if (unlikely (((uintptr_t)a & msk) != 0))
while ((uintptr_t)a & msk)
BODY (a, b, char);
long *la = (long *)a;
const long *lb = (const long *)b;
long *lend = (long *)((uintptr_t)end & ~msk);
if (unlikely (la < (lend - 8)))
{
while (la < (lend - 8))
{
long b0 = *lb++;
long b1 = *lb++;
long b2 = *lb++;
long b3 = *lb++;
long b4 = *lb++;
long b5 = *lb++;
long b6 = *lb++;
long b7 = *lb++;
long b8 = *lb++;
*la++ = b0;
*la++ = b1;
*la++ = b2;
*la++ = b3;
*la++ = b4;
*la++ = b5;
*la++ = b6;
*la++ = b7;
*la++ = b8;
}
}
while (la < lend)
BODY (la, lb, long);
a = (char *)la;
b = (const char *)lb;
if (unlikely (a < end))
goto small;
return aa;
}

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@ -0,0 +1,98 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
.text
.global memset
.type memset, @function
memset:
li t1, 15
move a4, a0
bleu a2, t1, .Ltiny
and a5, a4, 15
bnez a5, .Lmisaligned
.Laligned:
bnez a1, .Lwordify
.Lwordified:
and a3, a2, ~15
and a2, a2, 15
add a3, a3, a4
#if __riscv_xlen == 64
1:sd a1, 0(a4)
sd a1, 8(a4)
#else
1:sw a1, 0(a4)
sw a1, 4(a4)
sw a1, 8(a4)
sw a1, 12(a4)
#endif
add a4, a4, 16
bltu a4, a3, 1b
bnez a2, .Ltiny
ret
.Ltiny:
sub a3, t1, a2
sll a3, a3, 2
1:auipc t0, %pcrel_hi(.Ltable)
add a3, a3, t0
.option push
.option norvc
.Ltable_misaligned:
jr a3, %pcrel_lo(1b)
.Ltable:
sb a1,14(a4)
sb a1,13(a4)
sb a1,12(a4)
sb a1,11(a4)
sb a1,10(a4)
sb a1, 9(a4)
sb a1, 8(a4)
sb a1, 7(a4)
sb a1, 6(a4)
sb a1, 5(a4)
sb a1, 4(a4)
sb a1, 3(a4)
sb a1, 2(a4)
sb a1, 1(a4)
sb a1, 0(a4)
.option pop
ret
.Lwordify:
and a1, a1, 0xFF
sll a3, a1, 8
or a1, a1, a3
sll a3, a1, 16
or a1, a1, a3
#if __riscv_xlen == 64
sll a3, a1, 32
or a1, a1, a3
#endif
j .Lwordified
.Lmisaligned:
sll a3, a5, 2
1:auipc t0, %pcrel_hi(.Ltable_misaligned)
add a3, a3, t0
mv t0, ra
jalr a3, %pcrel_lo(1b)
mv ra, t0
add a5, a5, -16
sub a4, a4, a5
add a2, a2, a5
bleu a2, t1, .Ltiny
j .Laligned
.size memset, .-memset

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@ -0,0 +1,98 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#include <sys/asm.h>
/* int setjmp (jmp_buf); */
.globl setjmp
.type setjmp, @function
setjmp:
REG_S ra, 0*SZREG(a0)
REG_S s0, 1*SZREG(a0)
REG_S s1, 2*SZREG(a0)
#ifndef __riscv_32e
REG_S s2, 3*SZREG(a0)
REG_S s3, 4*SZREG(a0)
REG_S s4, 5*SZREG(a0)
REG_S s5, 6*SZREG(a0)
REG_S s6, 7*SZREG(a0)
REG_S s7, 8*SZREG(a0)
REG_S s8, 9*SZREG(a0)
REG_S s9, 10*SZREG(a0)
REG_S s10,11*SZREG(a0)
REG_S s11,12*SZREG(a0)
REG_S sp, 13*SZREG(a0)
#else
REG_S sp, 3*SZREG(a0)
#endif
#ifndef __riscv_float_abi_soft
FREG_S fs0, 14*SZREG+ 0*SZFREG(a0)
FREG_S fs1, 14*SZREG+ 1*SZFREG(a0)
FREG_S fs2, 14*SZREG+ 2*SZFREG(a0)
FREG_S fs3, 14*SZREG+ 3*SZFREG(a0)
FREG_S fs4, 14*SZREG+ 4*SZFREG(a0)
FREG_S fs5, 14*SZREG+ 5*SZFREG(a0)
FREG_S fs6, 14*SZREG+ 6*SZFREG(a0)
FREG_S fs7, 14*SZREG+ 7*SZFREG(a0)
FREG_S fs8, 14*SZREG+ 8*SZFREG(a0)
FREG_S fs9, 14*SZREG+ 9*SZFREG(a0)
FREG_S fs10,14*SZREG+10*SZFREG(a0)
FREG_S fs11,14*SZREG+11*SZFREG(a0)
#endif
li a0, 0
ret
.size setjmp, .-setjmp
/* volatile void longjmp (jmp_buf, int); */
.globl longjmp
.type longjmp, @function
longjmp:
REG_L ra, 0*SZREG(a0)
REG_L s0, 1*SZREG(a0)
REG_L s1, 2*SZREG(a0)
#ifndef __riscv_32e
REG_L s2, 3*SZREG(a0)
REG_L s3, 4*SZREG(a0)
REG_L s4, 5*SZREG(a0)
REG_L s5, 6*SZREG(a0)
REG_L s6, 7*SZREG(a0)
REG_L s7, 8*SZREG(a0)
REG_L s8, 9*SZREG(a0)
REG_L s9, 10*SZREG(a0)
REG_L s10,11*SZREG(a0)
REG_L s11,12*SZREG(a0)
REG_L sp, 13*SZREG(a0)
#else
REG_L sp, 3*SZREG(a0)
#endif
#ifndef __riscv_float_abi_soft
FREG_L fs0, 14*SZREG+ 0*SZFREG(a0)
FREG_L fs1, 14*SZREG+ 1*SZFREG(a0)
FREG_L fs2, 14*SZREG+ 2*SZFREG(a0)
FREG_L fs3, 14*SZREG+ 3*SZFREG(a0)
FREG_L fs4, 14*SZREG+ 4*SZFREG(a0)
FREG_L fs5, 14*SZREG+ 5*SZFREG(a0)
FREG_L fs6, 14*SZREG+ 6*SZFREG(a0)
FREG_L fs7, 14*SZREG+ 7*SZFREG(a0)
FREG_L fs8, 14*SZREG+ 8*SZFREG(a0)
FREG_L fs9, 14*SZREG+ 9*SZFREG(a0)
FREG_L fs10,14*SZREG+10*SZFREG(a0)
FREG_L fs11,14*SZREG+11*SZFREG(a0)
#endif
seqz a0, a1
add a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
ret
.size longjmp, .-longjmp

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@ -0,0 +1,148 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#include <sys/asm.h>
#if BYTE_ORDER != LITTLE_ENDIAN
# error
#endif
.text
.globl strcmp
.type strcmp, @function
strcmp:
or a4, a0, a1
li t2, -1
and a4, a4, SZREG-1
bnez a4, .Lmisaligned
#if SZREG == 4
li a5, 0x7f7f7f7f
#else
ld a5, mask
#endif
.macro check_one_word i n
REG_L a2, \i*SZREG(a0)
REG_L a3, \i*SZREG(a1)
and t0, a2, a5
or t1, a2, a5
add t0, t0, a5
or t0, t0, t1
bne t0, t2, .Lnull\i
.if \i+1-\n
bne a2, a3, .Lmismatch
.else
add a0, a0, \n*SZREG
add a1, a1, \n*SZREG
beq a2, a3, .Lloop
# fall through to .Lmismatch
.endif
.endm
.macro foundnull i n
.ifne \i
.Lnull\i:
add a0, a0, \i*SZREG
add a1, a1, \i*SZREG
.ifeq \i-1
.Lnull0:
.endif
bne a2, a3, .Lmisaligned
li a0, 0
ret
.endif
.endm
.Lloop:
# examine full words at a time, favoring strings of a couple dozen chars
#if __riscv_xlen == 32
check_one_word 0 5
check_one_word 1 5
check_one_word 2 5
check_one_word 3 5
check_one_word 4 5
#else
check_one_word 0 3
check_one_word 1 3
check_one_word 2 3
#endif
# backwards branch to .Lloop contained above
.Lmismatch:
# words don't match, but a2 has no null byte.
#if __riscv_xlen == 64
sll a4, a2, 48
sll a5, a3, 48
bne a4, a5, .Lmismatch_upper
sll a4, a2, 32
sll a5, a3, 32
bne a4, a5, .Lmismatch_upper
#endif
sll a4, a2, 16
sll a5, a3, 16
bne a4, a5, .Lmismatch_upper
srl a4, a2, 8*SZREG-16
srl a5, a3, 8*SZREG-16
sub a0, a4, a5
and a1, a0, 0xff
bnez a1, 1f
ret
.Lmismatch_upper:
srl a4, a4, 8*SZREG-16
srl a5, a5, 8*SZREG-16
sub a0, a4, a5
and a1, a0, 0xff
bnez a1, 1f
ret
1:and a4, a4, 0xff
and a5, a5, 0xff
sub a0, a4, a5
ret
.Lmisaligned:
# misaligned
lbu a2, 0(a0)
lbu a3, 0(a1)
add a0, a0, 1
add a1, a1, 1
bne a2, a3, 1f
bnez a2, .Lmisaligned
1:
sub a0, a2, a3
ret
# cases in which a null byte was detected
#if __riscv_xlen == 32
foundnull 0 5
foundnull 1 5
foundnull 2 5
foundnull 3 5
foundnull 4 5
#else
foundnull 0 3
foundnull 1 3
foundnull 2 3
#endif
.size strcmp, .-strcmp
#if SZREG == 8
.section .srodata.cst8,"aM",@progbits,8
.align 3
mask:
.dword 0x7f7f7f7f7f7f7f7f
#endif

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@ -0,0 +1,64 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#include <string.h>
#include <stdint.h>
char *strcpy(char *dst, const char *src)
{
char *dst0 = dst;
#if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__)
int misaligned = ((uintptr_t)dst | (uintptr_t)src) & (sizeof (long) - 1);
if (__builtin_expect(!misaligned, 1))
{
long *ldst = (long *)dst;
const long *lsrc = (const long *)src;
while (!__libc_detect_null(*lsrc))
*ldst++ = *lsrc++;
dst = (char *)ldst;
src = (const char *)lsrc;
char c0 = src[0];
char c1 = src[1];
char c2 = src[2];
if (!(*dst++ = c0)) return dst0;
if (!(*dst++ = c1)) return dst0;
char c3 = src[3];
if (!(*dst++ = c2)) return dst0;
if (sizeof (long) == 4) goto out;
char c4 = src[4];
if (!(*dst++ = c3)) return dst0;
char c5 = src[5];
if (!(*dst++ = c4)) return dst0;
char c6 = src[6];
if (!(*dst++ = c5)) return dst0;
if (!(*dst++ = c6)) return dst0;
out:
*dst++ = 0;
return dst0;
}
#endif /* not PREFER_SIZE_OVER_SPEED */
char ch;
do
{
ch = *src;
src++;
dst++;
*(dst - 1) = ch;
} while (ch);
return dst0;
}

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@ -0,0 +1,53 @@
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#include <string.h>
#include <stdint.h>
size_t strlen(const char *str)
{
const char *start = str;
#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
while (*str++)
;
return str - start - 1;
#else
if (__builtin_expect ((uintptr_t)str & (sizeof (long) - 1), 0)) do
{
char ch = *str;
str++;
if (!ch)
return str - start - 1;
} while ((uintptr_t)str & (sizeof (long) - 1));
unsigned long *ls = (unsigned long *)str;
while (!__libc_detect_null (*ls++))
;
asm volatile ("" : "+r"(ls)); /* prevent "optimization" */
str = (const char *)ls;
size_t ret = str - start, sl = sizeof (long);
char c0 = str[0 - sl], c1 = str[1 - sl], c2 = str[2 - sl], c3 = str[3 - sl];
if (c0 == 0) return ret + 0 - sl;
if (c1 == 0) return ret + 1 - sl;
if (c2 == 0) return ret + 2 - sl;
if (sl == 4 || c3 == 0) return ret + 3 - sl;
c0 = str[4 - sl], c1 = str[5 - sl], c2 = str[6 - sl], c3 = str[7 - sl];
if (c0 == 0) return ret + 4 - sl;
if (c1 == 0) return ret + 5 - sl;
if (c2 == 0) return ret + 6 - sl;
return ret + 7 - sl;
#endif /* not PREFER_SIZE_OVER_SPEED */
}

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/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#ifndef _SYS_ASM_H
#define _SYS_ASM_H
/*
* Macros to handle different pointer/register sizes for 32/64-bit code
*/
#if __riscv_xlen == 64
# define PTRLOG 3
# define SZREG 8
# define REG_S sd
# define REG_L ld
#elif __riscv_xlen == 32
# define PTRLOG 2
# define SZREG 4
# define REG_S sw
# define REG_L lw
#else
# error __riscv_xlen must equal 32 or 64
#endif
#ifndef __riscv_float_abi_soft
/* For ABI uniformity, reserve 8 bytes for floats, even if double-precision
floating-point is not supported in hardware. */
# define SZFREG 8
# ifdef __riscv_float_abi_single
# define FREG_L flw
# define FREG_S fsw
# elif defined(__riscv_float_abi_double)
# define FREG_L fld
# define FREG_S fsd
# elif defined(__riscv_float_abi_quad)
# define FREG_L flq
# define FREG_S fsq
# else
# error unsupported FLEN
# endif
#endif
#endif /* sys/asm.h */

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/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#ifndef _FENV_H_
#define _FENV_H_
#include <stddef.h>
/* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA:
* Version 2.1", Section 8.2, "Floating-Point Control and Status
* Register":
*
* Flag Mnemonic Flag Meaning
* ------------- -----------------
* NV Invalid Operation
* DZ Divide by Zero
* OF Overflow
* UF Underflow
* NX Inexact
*/
#define FE_INVALID 0x00000010
#define FE_DIVBYZERO 0x00000008
#define FE_OVERFLOW 0x00000004
#define FE_UNDERFLOW 0x00000002
#define FE_INEXACT 0x00000001
#define FE_ALL_EXCEPT (FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT)
/* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA:
* Version 2.1", Section 8.2, "Floating-Point Control and Status
* Register":
*
* Rounding Mode Mnemonic Meaning Meaning
* ------------- ---------------- -------
* 000 RNE Round to Nearest, ties to Even
* 001 RTZ Round towards Zero
* 010 RDN Round Down (towards )
* 011 RUP Round Up (towards +)
* 100 RMM Round to Nearest, ties to Max Magnitude
* 101 Invalid. Reserved for future use.
* 110 Invalid. Reserved for future use.
* 111 In instructions rm field, selects dynamic rounding mode;
* In Rounding Mode register, Invalid
*/
#define FE_TONEAREST_MM 0x00000004
#define FE_UPWARD 0x00000003
#define FE_DOWNWARD 0x00000002
#define FE_TOWARDZERO 0x00000001
#define FE_TONEAREST 0x00000000
#define FE_RMODE_MASK 0x7
/* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA:
* Version 2.1":
*
* "The F extension adds 32 floating-point registers, f0f31, each 32
* bits wide, and a floating-point control and status register fcsr,
* which contains the operating mode and exception status of the
* floating-point unit."
*/
typedef size_t fenv_t;
typedef size_t fexcept_t;
extern const fenv_t fe_dfl_env;
#define FE_DFL_ENV fe_dfl_env_p
#endif /* _FENV_H_ */

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/* Copyright (c) 2017 SiFive Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses.
*/
#ifndef _SYS_STRING_H
#define _SYS_STRING_H
static __inline unsigned long __libc_detect_null(unsigned long w)
{
unsigned long mask = 0x7f7f7f7f;
if (sizeof (long) == 8)
mask = ((mask << 16) << 16) | mask;
return ~(((w & mask) + mask) | w | mask);
}
#endif