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|
/* Assembly macros for C-SKY.
Copyright (C) 2018-2020 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
<https://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 */
|
