Add RISC-V port for libgloss
Contributor list:
- Andrew Waterman <andrew@sifive.com>
- Palmer Dabbelt <palmer@dabbelt.com>
- Kito Cheng <kito.cheng@gmail.com>
- Alex Suykov <alex.suykov@gmail.com>
This commit is contained in:
Kito Cheng
Jeff Johnston
parent
7040b2de08
commit
c496cbb6bd
|
|
@ -679,6 +679,7 @@ sparc_leon
|
|||
sparc
|
||||
wince
|
||||
mips
|
||||
riscv
|
||||
rs6000
|
||||
mn10200
|
||||
mn10300
|
||||
|
|
@ -2455,6 +2456,10 @@ case "${target}" in
|
|||
mips*-*-*)
|
||||
subdirs="$subdirs mips"
|
||||
|
||||
;;
|
||||
riscv*-*-*)
|
||||
subdirs="$subdirs riscv"
|
||||
|
||||
;;
|
||||
powerpc-*-*|powerpcle-*-*)
|
||||
subdirs="$subdirs rs6000"
|
||||
|
|
|
|||
|
|
@ -78,6 +78,9 @@ case "${target}" in
|
|||
mips*-*-*)
|
||||
AC_CONFIG_SUBDIRS([mips])
|
||||
;;
|
||||
riscv*-*-*)
|
||||
AC_CONFIG_SUBDIRS([riscv])
|
||||
;;
|
||||
powerpc-*-*|powerpcle-*-*)
|
||||
AC_CONFIG_SUBDIRS([rs6000])
|
||||
;;
|
||||
|
|
|
|||
|
|
@ -0,0 +1,200 @@
|
|||
#-------------------------------------------------------------------------
|
||||
# Source files
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
gloss_hdrs = \
|
||||
machine/syscall.h \
|
||||
|
||||
gloss_srcs = \
|
||||
syscalls.c \
|
||||
|
||||
# Extra files
|
||||
|
||||
crt0_asm = crt0.S
|
||||
|
||||
# Multilib support variables.
|
||||
# TOP is used instead of MULTI{BUILD,SRC}TOP.
|
||||
|
||||
MULTIDIRS =
|
||||
MULTISUBDIR =
|
||||
MULTIDO = true
|
||||
MULTICLEAN = true
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Basic setup
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
# Remove all default implicit rules since they can cause subtle bugs
|
||||
# and they just make things run slower
|
||||
|
||||
.SUFFIXES:
|
||||
% : %,v
|
||||
% : RCS/%,v
|
||||
% : RCS/%
|
||||
% : s.%
|
||||
% : SCCS/s.%
|
||||
|
||||
# Default is to build the prereqs of the all target (defined at bottom)
|
||||
|
||||
default : all
|
||||
.PHONY : default
|
||||
|
||||
# Source directory
|
||||
|
||||
obj_dir := .
|
||||
src_dir := @srcdir@
|
||||
VPATH := $(src_dir) $(src_dir)/machine
|
||||
|
||||
# Installation directories
|
||||
|
||||
prefix := @prefix@
|
||||
DESTDIR ?= $(prefix)
|
||||
|
||||
install_hdrs_dir := $(DESTDIR)$(prefix)/$(target_alias)/include/machine
|
||||
install_libs_dir = $(DESTDIR)$(prefix)/$(target_alias)/lib${MULTISUBDIR}
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Programs and flags
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
# C compiler
|
||||
|
||||
CC := @CC@
|
||||
CFLAGS := @CFLAGS@
|
||||
CPPFLAGS := -I$(obj_dir) -I$(src_dir)
|
||||
COMPILE := $(CC) -MMD -MP $(CPPFLAGS) $(CFLAGS)
|
||||
|
||||
# Library creation
|
||||
|
||||
AR := @AR@
|
||||
RANLIB := @RANLIB@
|
||||
|
||||
# Installation
|
||||
|
||||
INSTALL := @INSTALL@
|
||||
INSTALL_DATA := @INSTALL_DATA@
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Build Object Files from C Source
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
gloss_c_srcs = $(filter %.c, $(gloss_srcs))
|
||||
gloss_c_objs = $(patsubst %.c, %.o, $(notdir $(gloss_c_srcs)))
|
||||
gloss_c_deps = $(patsubst %.c, %.d, $(notdir $(gloss_c_srcs)))
|
||||
|
||||
$(gloss_c_objs) : %.o : %.c
|
||||
$(COMPILE) -c $<
|
||||
|
||||
objs += $(gloss_c_objs)
|
||||
deps += $(gloss_c_deps)
|
||||
junk += $(gloss_c_deps) $(gloss_c_objs)
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Build Object Files from Assembly Source
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
gloss_asm_srcs = $(filter %.S, $(gloss_srcs))
|
||||
gloss_asm_objs = $(patsubst %.S, %.o, $(notdir $(gloss_asm_srcs)))
|
||||
gloss_asm_deps = $(patsubst %.S, %.d, $(notdir $(gloss_asm_srcs)))
|
||||
|
||||
$(gloss_asm_objs) : %.o : %.S
|
||||
$(COMPILE) -c $<
|
||||
|
||||
objs += $(gloss_asm_objs)
|
||||
deps += $(gloss_asm_deps)
|
||||
junk += $(gloss_asm_deps) $(gloss_asm_objs)
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Build libgloss.a
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
gloss_lib = libgloss.a
|
||||
$(gloss_lib) : $(objs)
|
||||
$(AR) rcv $@ $^
|
||||
$(RANLIB) $@
|
||||
|
||||
junk += $(gloss_libs)
|
||||
|
||||
install_hdrs += $(gloss_hdrs)
|
||||
install_libs += $(gloss_lib)
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Build crt0.o
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
crt0_obj = $(patsubst %.S, %.o, $(crt0_asm))
|
||||
crt0_deps = $(patsubst %.S, %.d, $(crt0_asm))
|
||||
|
||||
$(crt0_obj) : %.o : %.S
|
||||
$(COMPILE) -c $<
|
||||
|
||||
deps += $(crt0_deps)
|
||||
junk += $(crt0_deps) $(crt0_obj)
|
||||
|
||||
install_libs += $(crt0_obj)
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Autodependency files
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
-include $(deps)
|
||||
|
||||
deps : $(deps)
|
||||
.PHONY : deps
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Installation
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
install_hdrs_wdir += $(addprefix $(src_dir)/, $(install_hdrs))
|
||||
install-hdrs : $(install_hdrs_wdir)
|
||||
test -d $(install_hdrs_dir) || mkdir -p $(install_hdrs_dir)
|
||||
for file in $^; do \
|
||||
$(INSTALL_DATA) $$file $(install_hdrs_dir)/; \
|
||||
done
|
||||
|
||||
install-libs : $(install_libs)
|
||||
test -d $(install_libs_dir) || mkdir -p $(install_libs_dir)
|
||||
for file in $^; do \
|
||||
$(INSTALL_DATA) $$file $(install_libs_dir)/$$file; \
|
||||
done
|
||||
|
||||
install : install-hdrs install-libs
|
||||
.PHONY : install install-hdrs install-libs
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Regenerate configure information
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
configure_prereq = \
|
||||
$(src_dir)/configure.in \
|
||||
|
||||
$(src_dir)/configure : $(configure_prereq)
|
||||
cd $(src_dir) && autoconf
|
||||
|
||||
config.status : $(src_dir)/configure
|
||||
./config.status --recheck
|
||||
|
||||
Makefile : $(src_dir)/Makefile.in config.status
|
||||
./config.status
|
||||
|
||||
dist_junk += config.status Makefile config.log
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Default
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
all : $(install_libs)
|
||||
.PHONY : all
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Clean up junk
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
clean :
|
||||
rm -rf *~ \#* $(junk)
|
||||
|
||||
distclean :
|
||||
rm -rf *~ \#* $(junk) $(dist_junk)
|
||||
|
||||
.PHONY : clean distclean
|
||||
|
|
@ -0,0 +1,72 @@
|
|||
#=========================================================================
|
||||
# aclocal.m4 for maven libgloss
|
||||
#=========================================================================
|
||||
# We cannot use the normal AC_PROG_CC since that macro will try and do a
|
||||
# link with the found compiler. Since we don't have all the startup
|
||||
# files setup yet (that's what we are compiling in libgloss!) we want to
|
||||
# find a compiler without actually doing a link. So the LIB_AC_PROG_CC
|
||||
# check is copied from xcc/src/libgloss/acinclude.m4
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# LIB_AC_PROG_CC_GNU
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
AC_DEFUN([LIB_AC_PROG_CC_GNU],
|
||||
[
|
||||
AC_CACHE_CHECK(whether we are using GNU C, ac_cv_prog_gcc,
|
||||
[dnl The semicolon is to pacify NeXT's syntax-checking cpp.
|
||||
|
||||
cat > conftest.c <<EOF
|
||||
#ifdef __GNUC__
|
||||
yes;
|
||||
#endif
|
||||
EOF
|
||||
|
||||
if AC_TRY_COMMAND(${CC-cc} -E conftest.c) | egrep yes >/dev/null 2>&1; then
|
||||
ac_cv_prog_gcc=yes
|
||||
else
|
||||
ac_cv_prog_gcc=no
|
||||
fi
|
||||
|
||||
])
|
||||
])
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# LIB_AC_PROG_CC
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
AC_DEFUN([LIB_AC_PROG_CC],
|
||||
[
|
||||
AC_BEFORE([$0],[AC_PROG_CPP])dnl
|
||||
AC_CHECK_PROG(CC, gcc, gcc)
|
||||
|
||||
if test -z "$CC"; then
|
||||
AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
|
||||
test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
|
||||
fi
|
||||
|
||||
LIB_AC_PROG_CC_GNU
|
||||
|
||||
if test $ac_cv_prog_gcc = yes; then
|
||||
GCC=yes
|
||||
dnl Check whether -g works, even if CFLAGS is set, in case the package
|
||||
dnl plays around with CFLAGS (such as to build both debugging and
|
||||
dnl normal versions of a library), tasteless as that idea is.
|
||||
ac_test_CFLAGS="${CFLAGS+set}"
|
||||
ac_save_CFLAGS="$CFLAGS"
|
||||
CFLAGS=
|
||||
_AC_PROG_CC_G
|
||||
if test "$ac_test_CFLAGS" = set; then
|
||||
CFLAGS="$ac_save_CFLAGS"
|
||||
elif test $ac_cv_prog_cc_g = yes; then
|
||||
CFLAGS="-g -O2"
|
||||
else
|
||||
CFLAGS="-O2"
|
||||
fi
|
||||
else
|
||||
GCC=
|
||||
test "${CFLAGS+set}" = set || CFLAGS="-g"
|
||||
fi
|
||||
|
||||
])
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,45 @@
|
|||
#=========================================================================
|
||||
# configure.ac for riscv libgloss and crt0
|
||||
#=========================================================================
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Setup
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
AC_INIT([crt0.S])
|
||||
AC_CONFIG_SRCDIR([crt0.S])
|
||||
AC_CONFIG_AUX_DIR([${srcdir}/../..])
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Checks for programs
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
LIB_AC_PROG_CC
|
||||
AC_CHECK_TOOL([AR],[ar])
|
||||
AC_CHECK_TOOL([RANLIB],[ranlib])
|
||||
AC_PROG_INSTALL
|
||||
|
||||
#-------------------------------------------------------------------------
|
||||
# Output
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
if test "$srcdir" = "." ; then
|
||||
if test "${with_target_subdir}" != "." ; then
|
||||
libgloss_topdir="${srcdir}/${with_multisrctop}../../.."
|
||||
else
|
||||
libgloss_topdir="${srcdir}/${with_multisrctop}../.."
|
||||
fi
|
||||
else
|
||||
libgloss_topdir="${srcdir}/../.."
|
||||
fi
|
||||
AC_CONFIG_AUX_DIR($libgloss_topdir)
|
||||
AC_CONFIG_FILES(Makefile,
|
||||
. ${libgloss_topdir}/config-ml.in,
|
||||
srcdir=${srcdir}
|
||||
target=${target}
|
||||
with_multisubdir=${with_multisubdir}
|
||||
ac_configure_args="${ac_configure_args} --enable-multilib"
|
||||
CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
|
||||
libgloss_topdir=${libgloss_topdir}
|
||||
)
|
||||
AC_OUTPUT
|
||||
|
|
@ -0,0 +1,54 @@
|
|||
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
|
||||
|
||||
This copyrighted material is made available to anyone wishing to use,
|
||||
modify, copy, or redistribute it subject to the terms and conditions
|
||||
of the BSD License. This program is distributed in the hope that
|
||||
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
|
||||
including the implied warranties of MERCHANTABILITY or FITNESS FOR
|
||||
A PARTICULAR PURPOSE. A copy of this license is available at
|
||||
http://www.opensource.org/licenses.
|
||||
*/
|
||||
|
||||
#=========================================================================
|
||||
# crt0.S : Entry point for RISC-V user programs
|
||||
#=========================================================================
|
||||
|
||||
.text
|
||||
.global _start
|
||||
.type _start, @function
|
||||
_start:
|
||||
# Initialize global pointer
|
||||
.option push
|
||||
.option norelax
|
||||
1:auipc gp, %pcrel_hi(__global_pointer$)
|
||||
addi gp, gp, %pcrel_lo(1b)
|
||||
.option pop
|
||||
|
||||
# Clear the bss segment
|
||||
la a0, _edata
|
||||
la a2, _end
|
||||
sub a2, a2, a0
|
||||
li a1, 0
|
||||
call memset
|
||||
|
||||
la a0, __libc_fini_array # Register global termination functions
|
||||
call atexit # to be called upon exit
|
||||
call __libc_init_array # Run global initialization functions
|
||||
|
||||
lw a0, 0(sp) # a0 = argc
|
||||
addi a1, sp, __SIZEOF_POINTER__ # a1 = argv
|
||||
li a2, 0 # a2 = envp = NULL
|
||||
call main
|
||||
tail exit
|
||||
.size _start, .-_start
|
||||
|
||||
.global _init
|
||||
.type _init, @function
|
||||
.global _fini
|
||||
.type _fini, @function
|
||||
_init:
|
||||
_fini:
|
||||
# These don't have to do anything since we use init_array/fini_array.
|
||||
ret
|
||||
.size _init, .-_init
|
||||
.size _fini, .-_fini
|
||||
|
|
@ -0,0 +1,82 @@
|
|||
/* 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 _MACHINE_SYSCALL_H
|
||||
#define _MACHINE_SYSCALL_H
|
||||
|
||||
#define SYS_getcwd 17
|
||||
#define SYS_dup 23
|
||||
#define SYS_fcntl 25
|
||||
#define SYS_faccessat 48
|
||||
#define SYS_chdir 49
|
||||
#define SYS_openat 56
|
||||
#define SYS_close 57
|
||||
#define SYS_getdents 61
|
||||
#define SYS_lseek 62
|
||||
#define SYS_read 63
|
||||
#define SYS_write 64
|
||||
#define SYS_writev 66
|
||||
#define SYS_pread 67
|
||||
#define SYS_pwrite 68
|
||||
#define SYS_fstatat 79
|
||||
#define SYS_fstat 80
|
||||
#define SYS_exit 93
|
||||
#define SYS_exit_group 94
|
||||
#define SYS_kill 129
|
||||
#define SYS_rt_sigaction 134
|
||||
#define SYS_times 153
|
||||
#define SYS_uname 160
|
||||
#define SYS_gettimeofday 169
|
||||
#define SYS_getpid 172
|
||||
#define SYS_getuid 174
|
||||
#define SYS_geteuid 175
|
||||
#define SYS_getgid 176
|
||||
#define SYS_getegid 177
|
||||
#define SYS_brk 214
|
||||
#define SYS_munmap 215
|
||||
#define SYS_mremap 216
|
||||
#define SYS_mmap 222
|
||||
#define SYS_open 1024
|
||||
#define SYS_link 1025
|
||||
#define SYS_unlink 1026
|
||||
#define SYS_mkdir 1030
|
||||
#define SYS_access 1033
|
||||
#define SYS_stat 1038
|
||||
#define SYS_lstat 1039
|
||||
#define SYS_time 1062
|
||||
#define SYS_getmainvars 2011
|
||||
|
||||
extern long __syscall_error(long);
|
||||
|
||||
static inline long
|
||||
__internal_syscall(long n, long _a0, long _a1, long _a2, long _a3)
|
||||
{
|
||||
register long a0 asm("a0") = _a0;
|
||||
register long a1 asm("a1") = _a1;
|
||||
register long a2 asm("a2") = _a2;
|
||||
register long a3 asm("a3") = _a3;
|
||||
|
||||
#ifdef __riscv_32e
|
||||
register long syscall_id asm("t0") = n;
|
||||
#else
|
||||
register long syscall_id asm("a7") = n;
|
||||
#endif
|
||||
|
||||
asm volatile ("scall"
|
||||
: "+r"(a0) : "r"(a1), "r"(a2), "r"(a3), "r"(syscall_id));
|
||||
|
||||
if (a0 < 0)
|
||||
return __syscall_error (a0);
|
||||
else
|
||||
return a0;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,419 @@
|
|||
/* 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.
|
||||
|
||||
========================================================================
|
||||
syscalls.c : Newlib operating system interface
|
||||
========================================================================
|
||||
This is the maven implementation of the narrow newlib operating
|
||||
system interface. It is based on the minimum stubs in the newlib
|
||||
documentation, the error stubs in libnosys, and the previous scale
|
||||
implementation. Please do not include any additional system calls or
|
||||
other functions in this file. Additional header and source files
|
||||
should be in the machine subdirectory.
|
||||
|
||||
Here is a list of the functions which make up the operating system
|
||||
interface. The file management instructions execute syscall assembly
|
||||
instructions so that a proxy kernel (or the simulator) can marshal up
|
||||
the request to the host machine. The process management functions are
|
||||
mainly just stubs since for now maven only supports a single process.
|
||||
|
||||
- File management functions
|
||||
+ open : (v) open file
|
||||
+ lseek : (v) set position in file
|
||||
+ read : (v) read from file
|
||||
+ write : (v) write to file
|
||||
+ fstat : (z) status of an open file
|
||||
+ stat : (z) status of a file by name
|
||||
+ close : (z) close a file
|
||||
+ link : (z) rename a file
|
||||
+ unlink : (z) remote file's directory entry
|
||||
|
||||
- Process management functions
|
||||
+ execve : (z) transfer control to new proc
|
||||
+ fork : (z) create a new process
|
||||
+ getpid : (v) get process id
|
||||
+ kill : (z) send signal to child process
|
||||
+ wait : (z) wait for a child process
|
||||
|
||||
- Misc functions
|
||||
+ isatty : (v) query whether output stream is a terminal
|
||||
+ times : (z) timing information for current process
|
||||
+ sbrk : (v) increase program data space
|
||||
+ _exit : (-) exit program without cleaning up files
|
||||
|
||||
There are two types of system calls. Those which return a value when
|
||||
everything is okay (marked with (v) in above list) and those which
|
||||
return a zero when everything is okay (marked with (z) in above
|
||||
list). On an error (ie. when the error flag is 1) the return value is
|
||||
always an errno which should correspond to the numbers in
|
||||
newlib/libc/include/sys/errno.h
|
||||
|
||||
See the newlib documentation for more information
|
||||
http://sourceware.org/newlib/libc.html#Syscalls
|
||||
*/
|
||||
|
||||
#include <machine/syscall.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/times.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/timeb.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <utime.h>
|
||||
|
||||
#define syscall_errno(n, a, b, c, d) \
|
||||
__internal_syscall(n, (long)(a), (long)(b), (long)(c), (long)(d))
|
||||
|
||||
long
|
||||
__syscall_error(long a0)
|
||||
{
|
||||
errno = -a0;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Open a file. */
|
||||
int
|
||||
_open(const char *name, int flags, int mode)
|
||||
{
|
||||
return syscall_errno (SYS_open, name, flags, mode, 0);
|
||||
}
|
||||
|
||||
/* Open file relative to given directory. */
|
||||
int
|
||||
_openat(int dirfd, const char *name, int flags, int mode)
|
||||
{
|
||||
return syscall_errno (SYS_openat, dirfd, name, flags, mode);
|
||||
}
|
||||
|
||||
/* Set position in a file. */
|
||||
off_t
|
||||
_lseek(int file, off_t ptr, int dir)
|
||||
{
|
||||
return syscall_errno (SYS_lseek, file, ptr, dir, 0);
|
||||
}
|
||||
|
||||
/* Read from a file. */
|
||||
ssize_t
|
||||
_read(int file, void *ptr, size_t len)
|
||||
{
|
||||
return syscall_errno (SYS_read, file, ptr, len, 0);
|
||||
}
|
||||
|
||||
/* Write to a file. */
|
||||
ssize_t
|
||||
_write(int file, const void *ptr, size_t len)
|
||||
{
|
||||
return syscall_errno (SYS_write, file, ptr, len, 0);
|
||||
}
|
||||
|
||||
struct kernel_stat
|
||||
{
|
||||
unsigned long long st_dev;
|
||||
unsigned long long st_ino;
|
||||
unsigned int st_mode;
|
||||
unsigned int st_nlink;
|
||||
unsigned int st_uid;
|
||||
unsigned int st_gid;
|
||||
unsigned long long st_rdev;
|
||||
unsigned long long __pad1;
|
||||
long long st_size;
|
||||
int st_blksize;
|
||||
int __pad2;
|
||||
long long st_blocks;
|
||||
struct timespec st_atim;
|
||||
struct timespec st_mtim;
|
||||
struct timespec st_ctim;
|
||||
int __glibc_reserved[2];
|
||||
};
|
||||
|
||||
/* Convert linux's stat64 sturct to newlib's stat. */
|
||||
static void
|
||||
conv_stat (struct stat *st, struct kernel_stat *kst)
|
||||
{
|
||||
st->st_dev = kst->st_dev;
|
||||
st->st_ino = kst->st_ino;
|
||||
st->st_mode = kst->st_mode;
|
||||
st->st_nlink = kst->st_nlink;
|
||||
st->st_uid = kst->st_uid;
|
||||
st->st_gid = kst->st_gid;
|
||||
st->st_rdev = kst->st_rdev;
|
||||
st->st_size = kst->st_size;
|
||||
st->st_blocks = kst->st_blocks;
|
||||
st->st_blksize = kst->st_blksize;
|
||||
st->st_atime = kst->st_atim.tv_sec;
|
||||
st->st_mtime = kst->st_mtim.tv_sec;
|
||||
st->st_ctime = kst->st_ctim.tv_sec;
|
||||
}
|
||||
|
||||
/* Status of an open file. The sys/stat.h header file required is
|
||||
distributed in the include subdirectory for this C library. */
|
||||
int
|
||||
_fstat(int file, struct stat *st)
|
||||
{
|
||||
struct kernel_stat kst;
|
||||
int rv = syscall_errno (SYS_fstat, file, &kst, 0, 0);
|
||||
conv_stat (st, &kst);
|
||||
return rv;
|
||||
}
|
||||
|
||||
/* Status of a file (by name). */
|
||||
int
|
||||
_stat(const char *file, struct stat *st)
|
||||
{
|
||||
struct kernel_stat kst;
|
||||
int rv = syscall_errno (SYS_stat, file, &kst, 0, 0);
|
||||
conv_stat (st, &kst);
|
||||
return rv;
|
||||
}
|
||||
|
||||
/* Status of a link (by name). */
|
||||
int
|
||||
_lstat(const char *file, struct stat *st)
|
||||
{
|
||||
struct kernel_stat kst;
|
||||
int rv = syscall_errno (SYS_lstat, file, &kst, 0, 0);
|
||||
conv_stat (st, &kst);
|
||||
return rv;
|
||||
}
|
||||
|
||||
/* Status of a file (by name) in a given directory. */
|
||||
int
|
||||
_fstatat(int dirfd, const char *file, struct stat *st, int flags)
|
||||
{
|
||||
struct kernel_stat kst;
|
||||
int rv = syscall_errno (SYS_fstatat, dirfd, file, &kst, flags);
|
||||
conv_stat (st, &kst);
|
||||
return rv;
|
||||
}
|
||||
|
||||
/* Permissions of a file (by name). */
|
||||
int
|
||||
_access(const char *file, int mode)
|
||||
{
|
||||
return syscall_errno (SYS_access, file, mode, 0, 0);
|
||||
}
|
||||
|
||||
/* Permissions of a file (by name) in a given directory. */
|
||||
int
|
||||
_faccessat(int dirfd, const char *file, int mode, int flags)
|
||||
{
|
||||
return syscall_errno (SYS_faccessat, dirfd, file, mode, flags);
|
||||
}
|
||||
|
||||
/* Close a file. */
|
||||
int
|
||||
_close(int file)
|
||||
{
|
||||
return syscall_errno (SYS_close, file, 0, 0, 0);
|
||||
}
|
||||
|
||||
/* Establish a new name for an existing file. */
|
||||
int
|
||||
_link(const char *old_name, const char *new_name)
|
||||
{
|
||||
return syscall_errno (SYS_link, old_name, new_name, 0, 0);
|
||||
}
|
||||
|
||||
/* Remove a file's directory entry. */
|
||||
int
|
||||
_unlink(const char *name)
|
||||
{
|
||||
return syscall_errno (SYS_unlink, name, 0, 0, 0);
|
||||
}
|
||||
|
||||
/* Transfer control to a new process. Minimal implementation for a
|
||||
system without processes from newlib documentation. */
|
||||
int
|
||||
_execve(const char *name, char *const argv[], char *const env[])
|
||||
{
|
||||
errno = ENOMEM;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Create a new process. Minimal implementation for a system without
|
||||
processes from newlib documentation. */
|
||||
|
||||
int
|
||||
_fork()
|
||||
{
|
||||
errno = EAGAIN;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Get process id. This is sometimes used to generate strings unlikely
|
||||
to conflict with other processes. Minimal implementation for a
|
||||
system without processes just returns 1. */
|
||||
|
||||
int
|
||||
_getpid()
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Send a signal. Minimal implementation for a system without processes
|
||||
just causes an error. */
|
||||
|
||||
int
|
||||
_kill(int pid, int sig)
|
||||
{
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Wait for a child process. Minimal implementation for a system without
|
||||
processes just causes an error. */
|
||||
|
||||
int
|
||||
_wait(int *status)
|
||||
{
|
||||
errno = ECHILD;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Query whether output stream is a terminal. For consistency with the
|
||||
other minimal implementations, which only support output to stdout,
|
||||
this minimal implementation is suggested by the newlib docs. */
|
||||
|
||||
int
|
||||
_isatty(int file)
|
||||
{
|
||||
struct stat s;
|
||||
int ret = _fstat (file, &s);
|
||||
return ret == -1 ? -1 : !!(s.st_mode & S_IFCHR);
|
||||
}
|
||||
|
||||
/* Get the current time. Only relatively correct. */
|
||||
|
||||
int
|
||||
_gettimeofday(struct timeval *tp, void *tz)
|
||||
{
|
||||
return syscall_errno (SYS_gettimeofday, tp, 0, 0, 0);
|
||||
}
|
||||
|
||||
/* Timing information for current process. From
|
||||
newlib/libc/include/sys/times.h the tms struct fields are as follows:
|
||||
|
||||
- clock_t tms_utime : user clock ticks
|
||||
- clock_t tms_stime : system clock ticks
|
||||
- clock_t tms_cutime : children's user clock ticks
|
||||
- clock_t tms_cstime : children's system clock ticks
|
||||
|
||||
Since maven does not currently support processes we set both of the
|
||||
children's times to zero. Eventually we might want to separately
|
||||
account for user vs system time, but for now we just return the total
|
||||
number of cycles since starting the program. */
|
||||
clock_t
|
||||
_times(struct tms *buf)
|
||||
{
|
||||
// when called for the first time, initialize t0
|
||||
static struct timeval t0;
|
||||
if(t0.tv_sec == 0)
|
||||
_gettimeofday (&t0,0);
|
||||
|
||||
struct timeval t;
|
||||
_gettimeofday (&t, 0);
|
||||
|
||||
long long utime = (t.tv_sec - t0.tv_sec) * 1000000 + (t.tv_usec - t0.tv_usec);
|
||||
buf->tms_utime = utime * CLOCKS_PER_SEC / 1000000;
|
||||
buf->tms_stime = buf->tms_cstime = buf->tms_cutime = 0;
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Get the current time. Only relatively correct. */
|
||||
int
|
||||
_ftime(struct timeb *tp)
|
||||
{
|
||||
tp->time = tp->millitm = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Stub. */
|
||||
int
|
||||
_utime(const char *path, const struct utimbuf *times)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Stub. */
|
||||
int
|
||||
_chown(const char *path, uid_t owner, gid_t group)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Stub. */
|
||||
int
|
||||
_chmod(const char *path, mode_t mode)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Stub. */
|
||||
int
|
||||
_chdir(const char *path)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Stub. */
|
||||
char *
|
||||
_getcwd(char *buf, size_t size)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Get configurable system variables. */
|
||||
|
||||
long
|
||||
_sysconf(int name)
|
||||
{
|
||||
switch (name)
|
||||
{
|
||||
case _SC_CLK_TCK:
|
||||
return CLOCKS_PER_SEC;
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Increase program data space. As malloc and related functions depend
|
||||
on this, it is useful to have a working implementation. The following
|
||||
is suggested by the newlib docs and suffices for a standalone
|
||||
system. */
|
||||
void *
|
||||
_sbrk(ptrdiff_t incr)
|
||||
{
|
||||
static unsigned long heap_end;
|
||||
|
||||
if (heap_end == 0)
|
||||
{
|
||||
long brk = syscall_errno (SYS_brk, 0, 0, 0, 0);
|
||||
if (brk == -1)
|
||||
return (void *)-1;
|
||||
heap_end = brk;
|
||||
}
|
||||
|
||||
if (syscall_errno (SYS_brk, heap_end + incr, 0, 0, 0) != heap_end + incr)
|
||||
return (void *)-1;
|
||||
|
||||
heap_end += incr;
|
||||
return (void *)(heap_end - incr);
|
||||
}
|
||||
|
||||
/* Exit a program without cleaning up files. */
|
||||
|
||||
void
|
||||
_exit(int exit_status)
|
||||
{
|
||||
syscall_errno (SYS_exit, exit_status, 0, 0, 0);
|
||||
while (1);
|
||||
}
|
||||
Loading…
Reference in New Issue