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[PATCH v8 05/12] C-SKY: Linux Syscall Interface

From: Mao Han <han_mao at c-sky dot com>
To: libc-alpha at sourceware dot org
Cc: c-sky_gcc_upstream at c-sky dot com, gnu-csky at mentor dot com, Mao Han <han_mao at c-sky dot com>
Date: Thu, 20 Dec 2018 11:02:41 +0800
Subject: [PATCH v8 05/12] C-SKY: Linux Syscall Interface
References: <cover.1545194586.git.han_mao@c-sky.com>
References: <cover.1545194586.git.han_mao@c-sky.com>
This patch contains the Linux system call interface.

	* sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S: New file.
	* sysdeps/unix/sysv/linux/csky/abiv2/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/syscall.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S: Likewise.
	* sysdeps/unix/sysv/linux/csky/syscalls.list: Likewise.
	* sysdeps/unix/sysv/linux/csky/pt-vfork.S: Likewise.
---
 .../unix/sysv/linux/csky/abiv2/____longjmp_chk.S   | 81 ++++++++++++++++++
 sysdeps/unix/sysv/linux/csky/abiv2/clone.S         | 95 +++++++++++++++++++++
 sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S    | 73 ++++++++++++++++
 sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S    | 96 ++++++++++++++++++++++
 sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S   | 78 ++++++++++++++++++
 sysdeps/unix/sysv/linux/csky/abiv2/syscall.S       | 69 ++++++++++++++++
 sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S        | 65 +++++++++++++++
 sysdeps/unix/sysv/linux/csky/pt-vfork.S            |  1 +
 sysdeps/unix/sysv/linux/csky/syscalls.list         |  2 +
 9 files changed, 560 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/abiv2/clone.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/abiv2/syscall.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/pt-vfork.S
 create mode 100644 sysdeps/unix/sysv/linux/csky/syscalls.list

diff --git a/sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S b/sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S
new file mode 100644
index 0000000..88cb310
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S
@@ -0,0 +1,81 @@
+/* longjmp with sp check for C-SKY ABIV2.
+   Copyright (C) 2018 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+	.section .rodata.str1.8,"aMS",@progbits,1
+	.align  2
+	.type   longjmp_msg,@object
+longjmp_msg:
+	.string "longjmp causes uninitialized stack frame"
+	.size   longjmp_msg, .-longjmp_msg
+
+	.text
+#define __longjmp ____longjmp_chk
+
+#ifdef __PIC__
+# define CALL_FAIL	\
+	subi	sp, 8;						\
+	stw	gb, (sp, 0);					\
+	grs	gb, .Lgetpc1;					\
+.Lgetpc1:							\
+	lrw	t0, .Lgetpc1@GOTPC;				\
+	addu	gb, gb, t0;					\
+	lrw	a0, longjmp_msg@GOTOFF;				\
+	addu	a0, a0, gb;					\
+	lrw	t0, (HIDDEN_JUMPTARGET (__fortify_fail))@PLT;	\
+	ldr.w	t0, (gb, t0 << 0);				\
+	jsr	t0;						\
+	ldw	gb, (sp, 0);					\
+	addi	sp, 8;
+#else /* __PIC__ */
+# define CALL_FAIL	\
+	lrw	a0, longjmp_msg;				\
+	jsri	HIDDEN_JUMPTARGET (__fortify_fail);
+#endif /* __PIC__ */
+
+# define CHECK_SP(reg)	\
+	cmplt	sp, reg;					\
+	bt	.Lok1;						\
+	mov	r9, a0;						\
+	mov	t0, r7;						\
+	lrw	r7, __NR_sigaltstack;				\
+	movi	a0, 0;						\
+	subi	sp, 12;	/* sizeof (stack_t) */			\
+	mov	a1, sp;						\
+	trap	0;						\
+	mov	r7, t0;						\
+	cmpnei	a0, 0;						\
+	bt	.Lok;						\
+	ldw	a1, (sp, 4);					\
+	btsti	a1, 1;						\
+	bt	.Lfail;						\
+	ldw	a1, (sp, 0);					\
+	ldw	a3, (sp, 8);					\
+	add	a1, a3;						\
+	sub	a1, reg;					\
+	cmphs	a1, a3;						\
+	bt	.Lok;						\
+.Lfail:								\
+	addi	sp, 12;						\
+	CALL_FAIL						\
+.Lok:								\
+	mov	a0, r9;						\
+.Lok1:
+
+#include <__longjmp.S>
diff --git a/sysdeps/unix/sysv/linux/csky/abiv2/clone.S b/sysdeps/unix/sysv/linux/csky/abiv2/clone.S
new file mode 100644
index 0000000..4d01e1b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/clone.S
@@ -0,0 +1,95 @@
+/* Wrapper around clone system call.  C-SKY ABIV2 version.
+   Copyright (C) 2018 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <sysdep.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+/* int clone (int (*fn) (void *arg), void *child_stack, int flags, void *arg,
+	      pid_t *ptid, struct user_desc *tls, pid_t *ctid) */
+
+        .text
+ENTRY (__clone)
+	/* Sanity check arguments.  */
+	cmpnei	a0, 0		/* No NULL function pointers.  */
+	bf	__error_arg
+	cmpnei	a1, 0		/* No NULL stack pointers.  */
+	bf	__error_arg
+
+	subi	a1, 8
+	stw	a0, (a1, 0)	/* Insert the function into the new stack.  */
+	stw	a3, (a1, 4)	/* Insert the args into the new stack.  */
+
+	mov	t1, r7		/* Save r7.  */
+	mov	t2, r4		/* Save r4.  */
+
+	/* The syscall expects the args to be in different slots.  */
+	mov	a0, a2
+	ldw	a2, (sp, 0)
+	ldw	a3, (sp, 8)
+	ldw	r4, (sp, 4)
+	lrw	r7, __NR_clone
+	trap	0
+
+	mov	r7, t1		/* Restore r7.  */
+	mov	r4, t2		/* Restore r4.  */
+	btsti	a0, 31		/* Check if return is less than zero.  */
+	bt	__do_syscall_error
+	cmpnei	a0, 0
+	bf	__child
+	rts
+
+__error_arg:
+	lrw	a0, -EINVAL
+
+__do_syscall_error:
+#ifdef __PIC__
+	subi	sp, 8
+	stw	gb, (sp, 0)
+	stw	r15, (sp, 4)
+	grs	gb, .Lgetpc
+.Lgetpc:
+	lrw	t0, .Lgetpc@GOTPC
+	addu	gb, gb, t0
+	lrw	t0, __syscall_error@PLT
+	ldr.w	t0, (gb, t0 << 0)
+	jsr	t0
+	ldw	gb, (sp, 0)
+	ldw	r15, (sp, 4)
+	addi	sp, 8
+#else
+	jmpi	__syscall_error
+#endif /* __PIC__ */
+	rts
+PSEUDO_END (__clone)
+
+__child:
+	ldw	a0, (sp, 4)	/* Restore args from new sp.  */
+	ldw	a1, (sp, 0)	/* Restore function from new sp.  */
+	addi	sp, 8
+	jsr	a1
+
+	/* exit */
+	lrw	r7, __NR_exit
+	trap	0
+
+libc_hidden_def (__clone)
+weak_alias (__clone, clone)
diff --git a/sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S b/sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S
new file mode 100644
index 0000000..9071c1b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S
@@ -0,0 +1,73 @@
+/* Save current context.  C-SKY ABIV2 version.
+   Copyright (C) 2018 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* int getcontext (ucontext_t *ucp) */
+
+ENTRY (__getcontext)
+	/* No need to save r2-r7 or a0-a3.  */
+	mov	t0, a0
+
+	addi	a0, MCONTEXT_CSKY_R4
+
+	stm	r4-r13, (a0)			/* Save r4-r13.  */
+	stw	sp, (t0, MCONTEXT_CSKY_SP)	/* Save sp.  */
+	stw	r15, (t0, MCONTEXT_CSKY_LR)	/* Save lr.  */
+	stw	r15, (t0, MCONTEXT_CSKY_PC)	/* Return to PC.  */
+	addi	a0, t0, MCONTEXT_CSKY_R16
+	stm	r16-r31, (a0)			/* Save r16-r31.  */
+	movi	a0, 0
+	stw	a0, (t0, MCONTEXT_CSKY_A0)	/* Return zero.  */
+
+	subi	sp, 8
+	stw	t0, (sp, 0)			/* Save t0 after "save sp".  */
+
+	/* __sigprocmask (SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
+	movi	a0, SIG_BLOCK
+	movi	a1, 0
+	addi	a2, t0, UCONTEXT_SIGMASK
+
+	/* Do sigprocmask syscall.  */
+#ifdef __PIC__
+	subi	sp, 8
+	stw	gb, (sp, 0)
+	grs	gb, .Lgetpc
+.Lgetpc:
+	lrw	a3, .Lgetpc@GOTPC
+	addu	gb, gb, a3
+	lrw	a3, __sigprocmask@PLT
+	ldr.w	a3, (gb, a3 << 0)
+	jsr	a3
+	ldw	gb, (sp, 0)
+	addi	sp, 8
+#else
+	jsri	__sigprocmask
+#endif
+
+	ldw	t0, (sp, 0)
+	addi	sp, 8
+	/* Restore r15 for sigprocmask changes.  */
+	ldw	r15, (t0, MCONTEXT_CSKY_LR)
+	movi	a0, 0				/* Return 0.  */
+	jmp	r15
+END (__getcontext)
+
+weak_alias (__getcontext, getcontext)
diff --git a/sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S b/sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S
new file mode 100644
index 0000000..827f0aa
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S
@@ -0,0 +1,96 @@
+/* Set saved user context to current context.  C-SKY ABIV2 version.
+   Copyright (C) 2018 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* int setcontext (const ucontext_t *ucp) */
+
+ENTRY (__setcontext)
+	mov	t0, a0
+	subi	sp, 8
+	stw	a0, (sp, 0)
+
+	/* Set sigmask.  */
+	movi	a0, SIG_SETMASK
+	addi	a1, t0, UCONTEXT_SIGMASK
+	movi	a2, 0
+
+	/* Do sigprocmask syscall.  */
+#ifdef __PIC__
+	subi	sp, 8
+	stw	gb, (sp, 0)
+	grs	gb, .Lgetpc1
+.Lgetpc1:
+	lrw	a3, .Lgetpc1@GOTPC
+	addu	gb, gb, a3
+	lrw	a3, __sigprocmask@PLT
+	ldr.w	a3, (gb, a3 << 0)
+	jsr	a3
+	ldw	gb, (sp, 0)
+	addi	sp, 8
+#else
+	jsri	__sigprocmask
+#endif /* __PIC__ */
+
+	ldw	t0, (sp, 0)
+	addi	sp, 8
+	/* Set r0-r11. Load a0-a3, for makecontext requires.  */
+	addi	t1, t0, MCONTEXT_CSKY_A0
+	ldm	r0-r11, (t1)
+	ldw	sp, (t0, MCONTEXT_CSKY_SP)	/* Load sp.  */
+	ldw	r15, (t0, MCONTEXT_CSKY_LR)	/* Load lr.  */
+	ldw	t0, (t0, MCONTEXT_CSKY_PC)	/* Load start addr.  */
+	jmp	t0
+END (setcontext)
+weak_alias (__setcontext, setcontext)
+
+ENTRY (__startcontext)
+	mov	a0, r9
+	cmpnei	r9, 0	/* r9 was set in makecontext.  */
+	bf	1f	/* null, then exit.  */
+
+	/* Call setcontext.  */
+#ifdef __PIC__
+	grs	t1, .Lgetpc2
+.Lgetpc2:
+	lrw	t0, .Lgetpc2@GOTPC
+	addu	t1, t1, t0
+	lrw	t0, __setcontext@GOT
+	ldr.w	t0, (t1, t0 << 0)
+#else
+	lrw	t0, __setcontext
+#endif
+	jsr	t0
+
+1:
+	/* Call _exit.  */
+#ifdef __PIC__
+	grs	t1, .Lgetpc3
+.Lgetpc3:
+	lrw	t0, .Lgetpc3@GOTPC
+	addu	t1, t1, t0
+	lrw	t0, _exit@GOT
+	ldr.w	t0, (t1, t0 << 0)
+#else
+	lrw	t0, _exit
+#endif
+	jsr	t0
+
+END (__startcontext)
diff --git a/sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S b/sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S
new file mode 100644
index 0000000..cc3c48d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S
@@ -0,0 +1,78 @@
+/* Save and set current context.  C-SKY ABIV2 version.
+   Copyright (C) 2018 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
+
+ENTRY (swapcontext)
+	/* Save params and lr.  */
+	subi	sp, 16
+	stw	a0, (sp, 0)
+	stw	a1, (sp, 4)
+	stw	r15, (sp, 8)
+
+	/* Call getcontext.  */
+#ifdef __PIC__
+	grs	t1, .Lgetpc1
+.Lgetpc1:
+	lrw	t0, .Lgetpc1@GOTPC
+	addu	t1, t1, t0
+	lrw	t0, __getcontext@GOT
+	ldr.w	t0, (t1, t0 << 0)
+	jsr	t0
+#else /* !__PIC__ */
+	jsri	__getcontext
+#endif
+
+	mov	a3, a0	/* Save return value.  */
+
+	/* Restore params and lr.  */
+	ldw	a0, (sp, 0)
+	ldw	a1, (sp, 4)
+	ldw	r15, (sp, 8)
+	addi	sp, 16
+
+	cmpnei	a3, 0
+	bt	error_exit
+
+	/* Fix up LR and the PC.  */
+	stw	sp, (a0, MCONTEXT_CSKY_SP)
+	stw	r15, (a0, MCONTEXT_CSKY_LR)
+	stw	r15, (a0, MCONTEXT_CSKY_PC)
+
+	/* Set setcontext's arg.  */
+	mov	a0, a1
+
+#ifdef __PIC__
+	grs	t1, .Lgetpc2
+.Lgetpc2:
+	lrw	a3, .Lgetpc2@GOTPC
+	addu	t1, t1, a3
+	lrw	a3, __setcontext@GOT
+	ldr.w	a3, (t1, a3 << 0)
+#else /* __PIC__ */
+	lrw	a3, __setcontext
+#endif /* __PIC__ */
+	jmp	a3
+
+error_exit:
+	jmp	r15
+END (swapcontext)
diff --git a/sysdeps/unix/sysv/linux/csky/abiv2/syscall.S b/sysdeps/unix/sysv/linux/csky/abiv2/syscall.S
new file mode 100644
index 0000000..539f4e9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/syscall.S
@@ -0,0 +1,69 @@
+/* System call interface.  C-SKY ABIV2 version.
+   Copyright (C) 2018 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+/* long syscall(long sysnum, long a, long b, long c, long d, long e, long f) */
+
+ENTRY (syscall)
+	subi	sp, 8
+	stw	r4, (sp, 0)
+	stw	r5, (sp, 4)
+	mov	t0, r7
+
+	/* Put system call number in r7, adjust shift for arguments
+           and load extra arguments from stack. */
+	mov	r7, a0
+	mov	a0, a1
+	mov	a1, a2
+	mov	a2, a3
+	ldw	a3, (sp, 8)
+	ldw	r4, (sp, 12)
+	ldw	r5, (sp, 16)
+	trap	0
+
+	/* Restore temp registers.  */
+	mov	r7, t0
+	ldw	r4, (sp, 0)
+	ldw	r5, (sp, 4)
+	addi	sp, 8
+
+	/* Check return value.  */
+	lrw	t0, 0xfffff000
+	cmphs	a0, t0
+	bf	1f
+#ifdef __PIC__
+	subi	sp, 8
+	stw	gb, (sp, 0)
+	stw	lr, (sp, 4)
+	grs	gb, .Lgetpc
+.Lgetpc:
+	lrw	t0, .Lgetpc@GOTPC
+	addu	gb, gb, t0
+	lrw	t0, __syscall_error@PLT
+	ldr.w	t0, (gb, t0 << 0)
+	jsr	t0
+	ldw	gb, (sp, 0)
+	ldw	lr, (sp, 4)
+	addi	sp, 8
+#else
+	jmpi	__syscall_error
+#endif /* __PIC__ */
+1:
+	rts
+PSEUDO_END (syscall)
diff --git a/sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S b/sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S
new file mode 100644
index 0000000..280c41a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S
@@ -0,0 +1,65 @@
+/* syscall error handlers.  C-SKY ABIV2 version.
+   Copyright (C) 2018 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+/* The syscall stubs jump here when they detect an error.
+   The code for Linux is almost identical to the canonical Unix
+   code, except that the error number in R0 is negated.  */
+
+#undef CALL_MCOUNT
+#define CALL_MCOUNT /* Don't insert the profiling call, it clobbers R0.  */
+
+	.text
+ENTRY (__syscall_error)
+	movi	a1, 0
+	rsub	a0, a0, a1
+
+#if !IS_IN (rtld)
+	mov	a1, a0
+	mov	a0, tls
+
+	grs	t1, .Lgetpc1
+.Lgetpc1:
+	lrw	t0, errno@gottpoff
+	add	t1, t1, t0
+	ldw	t1, (t1)
+	add	t1, a0
+	stw	a1, (t1)
+	bmaski	a0, 0
+	rts
+#elif RTLD_PRIVATE_ERRNO /* !IS_IN (rtld) */
+# ifdef  __PIC__
+	grs	t1, .Lgetpc2
+.Lgetpc2:
+	lrw	t0, .Lgetpc2@GOTPC
+	addu	t1, t1, t0
+	lrw	t0, rtld_errno@PLT
+	ldr.w	t0, (t1, t0 << 0)
+# else
+	lrw	t0, rtld_errno
+# endif /* __PIC__ */
+	stw	a0, (t0)
+	bmaski	a0, 0
+	rts
+#else
+# error "Unsupported non-TLS case"
+#endif /* RTLD_PRIVATE_ERRNO */
+
+#undef __syscall_error
+END (__syscall_error)
diff --git a/sysdeps/unix/sysv/linux/csky/pt-vfork.S b/sysdeps/unix/sysv/linux/csky/pt-vfork.S
new file mode 100644
index 0000000..1cc8931
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/pt-vfork.S
@@ -0,0 +1 @@
+/* Not needed.  */
diff --git a/sysdeps/unix/sysv/linux/csky/syscalls.list b/sysdeps/unix/sysv/linux/csky/syscalls.list
new file mode 100644
index 0000000..2a8feb1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/csky/syscalls.list
@@ -0,0 +1,2 @@
+# File name	Caller	Syscall name	Args	Strong name	Weak names
+cacheflush	-	cacheflush	i:pii	_flush_cache	cacheflush
-- 
2.7.4
References:
- [PATCH v8 00/12] port C-SKY to glibc
  - From: Mao Han
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