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>

1 files changed, 48 insertions, 0 deletions

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 */