glibc/sysdeps/unix/sysv/linux/csky/sysdep.h

/* Assembly macros for C-SKY.
   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/>.  */

#ifndef _LINUX_CSKY_SYSDEP_H
#define _LINUX_CSKY_SYSDEP_H 1

/* There is some commonality.  */
#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
#include <sysdeps/unix/sysv/linux/sysdep.h>
#include <sysdeps/csky/sysdep.h>

/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO.  */
#include <dl-sysdep.h>

#include <tls.h>

/* In order to get __set_errno() definition in INLINE_SYSCALL.  */
#ifndef __ASSEMBLER__
# include <errno.h>
#endif

#undef SYS_ify
#define SYS_ify(syscall_name)  (__NR_##syscall_name)

#ifdef __ASSEMBLER__
/* Linux uses a negative return value to indicate syscall errors,
   unlike most Unices, which use the condition codes' carry flag.

   Since version 2.1 the return value of a system call might be
   negative even if the call succeeded.  E.g., the `lseek' system call
   might return a large offset.  Therefore we must not anymore test
   for < 0, but test for a real error by making sure the value in R0
   is a real error number.  Linus said he will make sure the no syscall
   returns a value in -1 .. -4095 as a valid result so we can safely
   test with -4095.  */

# undef PSEUDO
# define PSEUDO(name, syscall_name, args)	\
  .text;					\
  ENTRY (name);					\
  DO_CALL (syscall_name, args);

# define GETGB				\
	grs	t0, .Lgetpc;		\
.Lgetpc:				\
	lrw	gb, .Lgetpc@GOTPC;	\
	addu	gb, t0;

# if IS_IN (libc)
#  ifdef __PIC__
#   define PSEUDO_RET			\
	btsti	a0, 31;			\
	bf	1f;			\
	subi	sp, 8;			\
	st.w	lr, (sp);		\
	st.w	gb, (sp, 4);		\
	GETGB;				\
	lrw	a2, SYSCALL_ERROR@PLT;	\
	add	a2, gb;			\
	ld.w	a2, (a2);		\
	jsr	a2;			\
	ld.w	lr, (sp);		\
	ld.w	gb, (sp, 4);		\
	addi	sp, 8;			\
1:					\
	rts
#  else
#   define PSEUDO_RET			\
	btsti	a0, 31;			\
	bf	1f;			\
	jmpi	SYSCALL_ERROR;		\
1:					\
	rts
#  endif
# else
#  ifdef __PIC__
#   define PSEUDO_RET			\
	btsti	a0, 31;			\
	bf	1f;			\
	subi	sp, 8;			\
	st.w	lr, (sp);		\
	st.w	gb, (sp, 4);		\
	GETGB;				\
	bsr	SYSCALL_ERROR;		\
	ld.w	lr, (sp);		\
	ld.w	gb, (sp, 4);		\
	addi	sp, 8;			\
1:					\
	rts
#  else
#   define PSEUDO_RET			\
	btsti	a0, 31;			\
	bt	SYSCALL_ERROR;		\
	rts
#  endif
# endif

# undef ret
# define ret PSEUDO_RET

# undef PSEUDO_END
# define PSEUDO_END(name)		\
  .align 4;				\
  SYSCALL_ERROR_HANDLER;		\
  END (name)

# undef PSEUDO_NOERRNO
# define PSEUDO_NOERRNO(name, syscall_name, args)	\
  .text;						\
  ENTRY (name);						\
  DO_CALL (syscall_name, args)

# define PSEUDO_RET_NOERRNO rts

# undef ret_NOERRNO
# define ret_NOERRNO PSEUDO_RET_NOERRNO

# undef PSEUDO_END_NOERRNO
# define PSEUDO_END_NOERRNO(name) END (name)

/* The function has to return the error code.  */
# undef PSEUDO_ERRVAL
# define PSEUDO_ERRVAL(name, syscall_name, args)	\
  .text;						\
  ENTRY (name)						\
  DO_CALL (syscall_name, args);				\
  not	a0;						\
  addi	a0, 1

# undef PSEUDO_END_ERRVAL
# define PSEUDO_END_ERRVAL(name) END (name)

# define ret_ERRVAL rts

# if !IS_IN (libc)
#  define SYSCALL_ERROR __local_syscall_error
#  if RTLD_PRIVATE_ERRNO
#   ifdef __PIC__
#    define SYSCALL_ERROR_HANDLER	\
__local_syscall_error:			\
	lrw	a1, rtld_errno@PLT; 	\
	addu	a1, gb;			\
	ldw	a1, (a1);		\
	rsubi	a0, 0;			\
	stw	a0, (a1);		\
	bmaski	a0, 0;			\
	rts
#   else /* __PIC__ */
#    define SYSCALL_ERROR_HANDLER	\
__local_syscall_error:			\
	lrw	a1, rtld_errno;		\
	rsubi	a0, 0;			\
	stw	a0, (a1);		\
	bmaski	a0, 0;			\
	rts
#   endif /* __PIC__ */
#  else /* !RTLD_PRIVATE_ERRNO */
#   ifdef __PIC__
#    define SYSCALL_ERROR_HANDLER		\
__local_syscall_error:				\
	subi	sp, 8;				\
	stw	a0, (sp, 0);			\
	stw	r15, (sp, 4);			\
	lrw	a1, __errno_location@PLT;	\
	add	a1, gb;				\
	ldw	a1, (a1);			\
	jsr	a1;				\
	ldw	a1, (sp, 0); /* load errno*/	\
	ldw	r15, (sp, 4);			\
	addi	sp, 8;				\
	movi	a2, 0;				\
	rsub	a1, a1, a2;			\
	stw	a1, (a0);			\
	bmaski	a0, 0;				\
	rts
#    else
#     define SYSCALL_ERROR_HANDLER 		\
__local_syscall_error:				\
	subi	sp, 8;				\
	stw	a0, (sp, 0);			\
	stw	r15, (sp, 4);			\
	lrw	a1, __errno_location;		\
	jsr	a1;				\
	ldw	a1, (sp, 0); /* load errno */	\
	ldw	r15, (sp, 4);			\
	addi	sp, 8;				\
	movi	a2, 0;				\
	rsub	a1, a1, a2;			\
	stw	a1, (a0);			\
	bmaski	a0, 0;				\
	rts
#   endif /* __PIC__ */
#  endif/* RTLD_PRIVATE_ERROR */
# else
#  define SYSCALL_ERROR_HANDLER  /* Nothing here; code in sysdep.S is used.  */
#  define SYSCALL_ERROR __syscall_error
# endif/* IS_IN (libc) */

/* define DO_CALL */
# undef DO_CALL
# define DO_CALL(syscall_name, args)	\
  DOARGS_##args;			\
  lrw	r7, SYS_ify(syscall_name);	\
  trap	0;				\
  UNDOARGS_##args

# undef  DOARGS_0
# define DOARGS_0			\
	subi	sp, 8;			\
	cfi_adjust_cfa_offset (8);	\
	stw	r7, (sp, 0);		\
	cfi_rel_offset (r7, 0);

# undef  DOARGS_1
# define DOARGS_1 DOARGS_0
# undef  DOARGS_2
# define DOARGS_2 DOARGS_0
# undef  DOARGS_3
# define DOARGS_3 DOARGS_0
# undef  DOARGS_4
# define DOARGS_4 DOARGS_0
# undef  DOARGS_5
# define DOARGS_5			\
	subi	sp, 8;			\
	cfi_adjust_cfa_offset (8);	\
	stw	r7, (sp, 0);		\
	cfi_rel_offset (7, 0);		\
	stw	r4, (sp, 4);		\
	cfi_rel_offset (4, 4);		\
	ldw	r4, (sp, 8)
# undef  DOARGS_6
# define DOARGS_6			\
	subi	sp, 16;			\
	cfi_adjust_cfa_offset (16);	\
	stw	r7, (sp, 0);		\
	cfi_rel_offset (7, 0);		\
	stw	r4, (sp, 4);		\
	cfi_rel_offset (4, 4);		\
	stw	r5, (sp, 8);		\
	cfi_rel_offset (5, 8);		\
	ldw	r4, (sp, 16);		\
	ldw	r5, (sp, 20)

# undef  UNDOARGS_0
# define UNDOARGS_0 \
  ldw  r7, (sp, 0); \
  cfi_restore (r7); \
  addi sp, 8;   \
  cfi_adjust_cfa_offset (-8);

# undef  UNDOARGS_1
# define UNDOARGS_1 UNDOARGS_0
# undef  UNDOARGS_2
# define UNDOARGS_2 UNDOARGS_0
# undef  UNDOARGS_3
# define UNDOARGS_3 UNDOARGS_0
# undef  UNDOARGS_4
# define UNDOARGS_4 UNDOARGS_0
# undef  UNDOARGS_5
# define UNDOARGS_5			\
	ldw	r7, (sp, 0);		\
	cfi_restore (r4);		\
	ldw	r4, (sp, 4);		\
	cfi_restore (r4);		\
	addi	sp, 8;			\
	cfi_adjust_cfa_offset (-8);

# undef  UNDOARGS_6
# define UNDOARGS_6			\
	ldw	r7, (sp, 0);		\
	cfi_restore (r7);		\
	ldw	r4, (sp, 4);		\
	cfi_restore (r4);		\
	ldw	r5, (sp, 8);		\
	cfi_restore (r5);		\
	addi	sp, 16;			\
	cfi_adjust_cfa_offset (-16);

#else /* not __ASSEMBLER__ */

/* Define a macro which expands into the inline wrapper code for a system
   call.  */
# undef INLINE_SYSCALL
# define INLINE_SYSCALL(name, nr, args...)				\
  ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args);	\
     if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result,), 0))	\
       {								\
	 __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, ));		\
	 _sys_result = (unsigned int) -1;				\
       }								\
     (int) _sys_result; })

# undef INTERNAL_SYSCALL_DECL
# define INTERNAL_SYSCALL_DECL(err) do { } while (0)

# undef INTERNAL_SYSCALL_ERROR_P
# define INTERNAL_SYSCALL_ERROR_P(val, err) \
  ((unsigned int) (val) >= 0xffffff01u)

# undef INTERNAL_SYSCALL_ERRNO
# define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))

# undef INTERNAL_SYSCALL_RAW
#  define INTERNAL_SYSCALL_RAW0(name, err, dummy...)			\
  ({unsigned int __sys_result;						\
     {									\
       register int _a1 __asm__ ("a0"), _nr __asm__ ("r7");		\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr)				\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

#  define INTERNAL_SYSCALL_RAW1(name, err, arg1)			\
  ({unsigned int __sys_result;						\
    register int _tmp_arg1 = (int)(arg1);				\
     {									\
       register int _a1 __asm__ ("a0"), _nr __asm__ ("r7");		\
       _a1 = _tmp_arg1;							\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr), "r" (_a1)			\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

#  define INTERNAL_SYSCALL_RAW2(name, err, arg1, arg2)			\
  ({unsigned int __sys_result;						\
    register int _tmp_arg1 = (int)(arg1), _tmp_arg2 = (int)(arg2);	\
     {									\
       register int _nr __asm__ ("r7");					\
       register int _a1 __asm__ ("a0"), _a2 __asm__ ("a1");		\
       _a1 = _tmp_arg1, _a2 = _tmp_arg2;				\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr), "r" (_a1), "r" (_a2)		\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

#  define INTERNAL_SYSCALL_RAW3(name, err, arg1, arg2, arg3)		\
  ({unsigned int __sys_result;						\
    register int _tmp_arg1 = (int)(arg1), _tmp_arg2 = (int)(arg2);	\
    register int _tmp_arg3 = (int)(arg3);				\
     {									\
       register int _nr __asm__ ("r7");					\
       register int _a1 __asm__ ("a0"), _a2 __asm__ ("a1");		\
       register int _a3 __asm__ ("a2");					\
       _a1 = _tmp_arg1;							\
       _a2 = _tmp_arg2;							\
       _a3 = _tmp_arg3;							\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr), "r" (_a1), "r" (_a2),		\
			       "r" (_a3)				\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

#  define INTERNAL_SYSCALL_RAW4(name, err, arg1, arg2, arg3, arg4)	\
  ({unsigned int __sys_result;						\
    register int _tmp_arg1 = (int)(arg1), _tmp_arg2 = (int)(arg2);	\
    register int _tmp_arg3 = (int)(arg3), _tmp_arg4 = (int)(arg4);	\
     {									\
       register int _nr __asm__ ("r7");					\
       register int _a1 __asm__ ("a0"), _a2 __asm__ ("a1");		\
       register int _a3 __asm__ ("a2"), _a4 __asm__ ("a3");		\
       _a1 = _tmp_arg1, _a2 = _tmp_arg2, _a3 = _tmp_arg3;		\
       _a4 = _tmp_arg4;							\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr), "r" (_a1), "r" (_a2),		\
			       "r" (_a3), "r" (_a4)			\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

#  define INTERNAL_SYSCALL_RAW5(name, err, arg1, arg2, arg3, arg4,	\
			      arg5)					\
  ({unsigned int __sys_result;						\
    register int _tmp_arg1 = (int)(arg1), _tmp_arg2 = (int)(arg2);	\
    register int _tmp_arg3 = (int)(arg3), _tmp_arg4 = (int)(arg4);	\
    register int _tmp_arg5 = (int)(arg5);				\
     {									\
       register int _nr __asm__ ("r7");					\
       register int _a1 __asm__ ("a0"), _a2 __asm__ ("a1");		\
       register int _a3 __asm__ ("a2"), _a4 __asm__ ("a3");		\
       register int _a5 __asm__ ("r4");					\
       _a1 = _tmp_arg1, _a2 = _tmp_arg2, _a3 = _tmp_arg3;		\
       _a4 = _tmp_arg4, _a5 = _tmp_arg5;				\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr), "r" (_a1), "r" (_a2),		\
			       "r" (_a3), "r" (_a4), "r" (_a5)		\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

#  define INTERNAL_SYSCALL_RAW6(name, err, arg1, arg2, arg3, arg4,	\
			      arg5, arg6)				\
  ({unsigned int __sys_result;						\
    register int _tmp_arg1 = (int)(arg1), _tmp_arg2 = (int)(arg2);	\
    register int _tmp_arg3 = (int)(arg3), _tmp_arg4 = (int)(arg4);	\
    register int _tmp_arg5 = (int)(arg5), _tmp_arg6 = (int)(arg6);	\
     {									\
       register int _nr __asm__ ("r7");					\
       register int _a1 __asm__ ("a0"), _a2 __asm__ ("a1");		\
       register int _a3 __asm__ ("a2"), _a4 __asm__ ("a3");		\
       register int _a5 __asm__ ("r4"), _a6 __asm__ ("r5");		\
       _a1 = _tmp_arg1, _a2 = _tmp_arg2, _a3 = _tmp_arg3;		\
       _a4 = _tmp_arg4, _a5 = _tmp_arg5, _a6 = _tmp_arg6;		\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr), "r" (_a1), "r" (_a2),		\
			       "r" (_a3), "r" (_a4), "r" (_a5),		\
			       "r" (_a6)				\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

#  define INTERNAL_SYSCALL_RAW7(name, err, arg1, arg2, arg3, arg4,	\
			      arg5, arg6, arg7)				\
  ({unsigned int __sys_result;						\
    register int _tmp_arg1 = (int)(arg1), _tmp_arg2 = (int)(arg2);	\
    register int _tmp_arg3 = (int)(arg3), _tmp_arg4 = (int)(arg4);	\
    register int _tmp_arg5 = (int)(arg5), _tmp_arg6 = (int)(arg6);	\
    register int _tmp_arg7 = (int)(arg7);				\
     {									\
       register int _nr __asm__ ("r7");					\
       register int _a1 __asm__ ("a0"), _a2 __asm__ ("a1");		\
       register int _a3 __asm__ ("a2"), _a4 __asm__ ("a3");		\
       register int _a5 __asm__ ("r4"), _a6 __asm__ ("r5");		\
       register int _a7 __asm__ ("r6");					\
       _a1 = _tmp_arg1, _a2 = _tmp_arg2, _a3 = _tmp_arg3;		\
       _a4 = _tmp_arg4, _a5 = _tmp_arg5, _a6 = _tmp_arg6;		\
       _a7 = _tmp_arg7;							\
       _nr = name;							\
       __asm__ __volatile__ ("trap  0 \n\t"				\
			     : "=r" (_a1)				\
			     : "r" (_nr), "r" (_a1), "r" (_a2),		\
			       "r" (_a3), "r" (_a4), "r" (_a5),		\
			       "r" (_a6), "r" (_a7)			\
			     : "memory");				\
	       __sys_result = _a1;					\
     }									\
     (int) __sys_result; })

# undef INTERNAL_SYSCALL
# define INTERNAL_SYSCALL(name, err, nr, args...)		\
  INTERNAL_SYSCALL_RAW##nr(SYS_ify(name), err, args)

# undef INTERNAL_SYSCALL_NCS
# define INTERNAL_SYSCALL_NCS(number, err, nr, args...)		\
  INTERNAL_SYSCALL_RAW##nr (number, err, args)

#endif /* __ASSEMBLER__ */

/* Pointer mangling support.  */
#if (IS_IN (rtld) || \
     (!defined SHARED && (IS_IN (libc) || IS_IN (libpthread))))
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(dst, src, guard)			\
	grs	t0, 1f;					\
1:							\
	lrw	guard, 1b@GOTPC;			\
	addu	t0, guard;				\
	lrw	guard, __pointer_chk_guard_local@GOT;	\
	ldr.w	guard, (t0, guard << 0);		\
	ldw	guard, (guard, 0);			\
	xor	dst, src, guard;
#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
#  define PTR_MANGLE2(dst, src, guard) \
	xor	dst, src, guard
#  define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard)
# else
extern uintptr_t __pointer_chk_guard_local;
#  define PTR_MANGLE(var) \
  (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
#  define PTR_DEMANGLE(var) PTR_MANGLE (var)
# endif
#else
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(dst, src, guard)		\
	grs	t0, 1f;				\
1:						\
	lrw	guard, 1b@GOTPC;		\
	addu	t0, guard;			\
	lrw	guard, __pointer_chk_guard@GOT;	\
	ldr.w	guard, (t0, guard << 0);	\
	ldw	guard, (guard, 0);		\
	xor	dst, src, guard;
#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
#  define PTR_MANGLE2(dst, src, guard) \
	xor	dst, src, guard
#  define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard)
# else
extern uintptr_t __pointer_chk_guard;
#  define PTR_MANGLE(var) \
  (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
#  define PTR_DEMANGLE(var) PTR_MANGLE (var)
# endif
#endif

#endif /* linux/csky/sysdep.h */