csky: port to uclibc-ng

Follow the steps to build c-sky uclibc linux system:
1. git clone https://github.com/c-sky/buildroot.git
2. cd buildroot
3. make qemu_csky_ck810_uclibc_defconfig
4. make

Follow the buildroot/board/qemu/csky/readme.txt to run.

This buildroot toolchain is pre-build, But you can rebuild
the c-sky uclibc-ng alone and install it to the buildroot
sysroot manually.

We'll try our best to improve the uclibc-ng continuously.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>

4 files changed, 201 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/csky/sys/cachectl.h b/libc/sysdeps/linux/csky/sys/cachectl.h
new file mode 100644
index 000000000..0d45bf07f
--- /dev/null
+++ b/libc/sysdeps/linux/csky/sys/cachectl.h
@@ -0,0 +1,10 @@
+#ifndef _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H	1
+
+#include <asm/cachectl.h>
+
+__BEGIN_DECLS
+extern int cacheflush(void *addr, int nbytes, int flags);
+__END_DECLS
+
+#endif
diff --git a/libc/sysdeps/linux/csky/sys/procfs.h b/libc/sysdeps/linux/csky/sys/procfs.h
new file mode 100644
index 000000000..91c1388d7
--- /dev/null
+++ b/libc/sysdeps/linux/csky/sys/procfs.h
@@ -0,0 +1,126 @@
+/* Copyright (C) 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_PROCFS_H
+#define _SYS_PROCFS_H	1
+
+/* This is somewhat modelled after the file of the same name on SVR4
+   systems.  It provides a definition of the core file format for ELF
+   used on Linux.  It doesn't have anything to do with the /proc file
+   system, even though Linux has one.
+
+   Anyway, the whole purpose of this file is for GDB and GDB only.
+   Don't read too much into it.  Don't use it for anything other than
+   GDB unless you know what you are doing.  */
+
+#include <features.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/user.h>
+
+__BEGIN_DECLS
+
+/* Type for a general-purpose register.  */
+typedef unsigned long elf_greg_t;
+
+/* And the whole bunch of them.  We could have used `struct
+   user_regs' directly in the typedef, but tradition says that
+   the register set is an array, which does have some peculiar
+   semantics, so leave it that way.  */
+#define ELF_NGREG (sizeof (struct user_regs) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/* Register set for the floating-point registers.  */
+typedef struct user_fpregs elf_fpregset_t;
+
+
+/* Signal info.  */
+struct elf_siginfo
+  {
+    int si_signo;			/* Signal number.  */
+    int si_code;			/* Extra code.  */
+    int si_errno;			/* Errno.  */
+  };
+
+
+/* Definitions to generate Intel SVR4-like core files.  These mostly
+   have the same names as the SVR4 types with "elf_" tacked on the
+   front to prevent clashes with Linux definitions, and the typedef
+   forms have been avoided.  This is mostly like the SVR4 structure,
+   but more Linuxy, with things that Linux does not support and which
+   GDB doesn't really use excluded.  */
+
+struct elf_prstatus
+  {
+    struct elf_siginfo pr_info;		/* Info associated with signal.  */
+    short int pr_cursig;		/* Current signal.  */
+    unsigned long int pr_sigpend;	/* Set of pending signals.  */
+    unsigned long int pr_sighold;	/* Set of held signals.  */
+    __pid_t pr_pid;
+    __pid_t pr_ppid;
+    __pid_t pr_pgrp;
+    __pid_t pr_sid;
+    struct timeval pr_utime;		/* User time.  */
+    struct timeval pr_stime;		/* System time.  */
+    struct timeval pr_cutime;		/* Cumulative user time.  */
+    struct timeval pr_cstime;		/* Cumulative system time.  */
+    elf_gregset_t pr_reg;		/* GP registers.  */
+    int pr_fpvalid;			/* True if math copro being used.  */
+  };
+
+
+#define ELF_PRARGSZ     (80)    /* Number of chars for args.  */
+
+struct elf_prpsinfo
+  {
+    char pr_state;			/* Numeric process state.  */
+    char pr_sname;			/* Char for pr_state.  */
+    char pr_zomb;			/* Zombie.  */
+    char pr_nice;			/* Nice val.  */
+    unsigned long int pr_flag;		/* Flags.  */
+    unsigned short int pr_uid;
+    unsigned short int pr_gid;
+    int pr_pid, pr_ppid, pr_pgrp, pr_sid;
+    /* Lots missing */
+    char pr_fname[16];			/* Filename of executable.  */
+    char pr_psargs[ELF_PRARGSZ];	/* Initial part of arg list.  */
+  };
+
+
+/* The rest of this file provides the types for emulation of the
+   Solaris <proc_service.h> interfaces that should be implemented by
+   users of libthread_db.  */
+
+/* Addresses.  */
+typedef void *psaddr_t;
+
+/* Register sets.  Linux has different names.  */
+typedef elf_gregset_t prgregset_t;
+typedef elf_fpregset_t prfpregset_t;
+
+/* We don't have any differences between processes and threads,
+   therefore have only one PID type.  */
+typedef __pid_t lwpid_t;
+
+/* Process status and info.  In the end we do provide typedefs for them.  */
+typedef struct elf_prstatus prstatus_t;
+typedef struct elf_prpsinfo prpsinfo_t;
+
+__END_DECLS
+
+#endif	/* sys/procfs.h */
diff --git a/libc/sysdeps/linux/csky/sys/ucontext.h b/libc/sysdeps/linux/csky/sys/ucontext.h
new file mode 100644
index 000000000..59176882c
--- /dev/null
+++ b/libc/sysdeps/linux/csky/sys/ucontext.h
@@ -0,0 +1,17 @@
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+#include <signal.h>
+#include <bits/sigcontext.h>
+
+typedef struct ucontext
+{
+	unsigned long int uc_flags;
+	struct ucontext * uc_link;
+	stack_t           uc_stack;
+	struct sigcontext uc_mcontext;
+	sigset_t          uc_sigmask;
+} ucontext_t;
+
+#endif /* sys/ucontext.h */
diff --git a/libc/sysdeps/linux/csky/sys/user.h b/libc/sysdeps/linux/csky/sys/user.h
new file mode 100644
index 000000000..4ab1972a0
--- /dev/null
+++ b/libc/sysdeps/linux/csky/sys/user.h
@@ -0,0 +1,48 @@
+#ifndef _SYS_USER_H
+#define _SYS_USER_H  1
+
+struct user_fpregs {
+	unsigned long  fsr;         /* fpu status reg */
+	unsigned long  fesr;        /* fpu exception status reg */
+	unsigned long  fp[32];      /* fpu general regs */
+};
+
+struct user_regs {
+#if defined(__CSKYABIV2__)
+	unsigned long int uregs[34];  /* CSKY V2 has 32 general rgister */
+#else
+	unsigned long int uregs[18];  /* CSKY V1 has 16 general rgister */
+#endif
+};
+
+/*
+ * When the kernel dumps core, it starts by dumping the user struct -
+ * this will be used by gdb to figure out where the data and stack segments
+ * are within the file, and what virtual addresses to use.
+ */
+struct user{
+/* We start with the registers, to mimic the way that "memory" is returned
+   from the ptrace(3,...) function.  */
+	struct user_regs    regs; /* Where the registers are actually stored */
+	int                 u_fpvalid;  /* True if math co-processor being used. */
+
+/* The rest of this junk is to help gdb figure out what goes where */
+	unsigned long int   u_tsize;	/* Text segment size (pages). */
+	unsigned long int   u_dsize;	/* Data segment size (pages). */
+	unsigned long int   u_ssize;	/* Stack segment size (pages). */
+	unsigned long       start_code; /* Starting virtual address of text. */
+	unsigned long       start_stack;/* Starting virtual address of stack area.
+					   This is actually the bottom of the stack,
+					   the top of the stack is always found in
+					   the esp register.  */
+	long int            signal;     /* Signal that caused the core dump. */
+	int                 reserved;	/* No longer used */
+	struct user_regs *  u_ar0;	/* Used by gdb to help find the values
+					   for the registers. */
+	unsigned long       magic;	/* To uniquely identify a core file */
+	char                u_comm[32];	/* User command that was responsible */
+	struct user_fpregs  u_fp;
+	struct user_fpregs* u_fpstate;	/* Math Co-processor pointer. */
+};
+
+#endif /* _SYS_USER_H */