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/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>.
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_SH_SYSDEP_H
#define _LINUX_SH_SYSDEP_H 1
/* There is some commonality. */
#include <sysdeps/unix/sysv/linux/sysdep.h>
#include <sysdeps/unix/sh/sysdep.h>
#include <tls.h>
/* For Linux we can use the system call table in the header file
/usr/include/asm/unistd.h
of the kernel. But these symbols do not follow the SYS_* syntax
so we have to redefine the `SYS_ify' macro here. */
#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 savely
test with -4095. */
#define _IMM1 #-1
#define _IMM12 #-12
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name); \
DO_CALL (syscall_name, args); \
mov r0,r1; \
mov _IMM12,r2; \
shad r2,r1; \
not r1,r1; \
tst r1,r1; \
bf .Lpseudo_end; \
SYSCALL_ERROR_HANDLER; \
.Lpseudo_end:
#undef PSEUDO_END
#define PSEUDO_END(name) \
END (name)
#undef PSEUDO_NOERRNO
#define PSEUDO_NOERRNO(name, syscall_name, args) \
.text; \
ENTRY (name); \
DO_CALL (syscall_name, args)
#undef PSEUDO_END_NOERRNO
#define PSEUDO_END_NOERRNO(name) \
END (name)
#define ret_NOERRNO ret
#define PSEUDO_ERRVAL(name, syscall_name, args) \
.text; \
ENTRY (name); \
DO_CALL (syscall_name, args);
#undef PSEUDO_END_ERRVAL
#define PSEUDO_END_ERRVAL(name) \
END (name)
#define ret_ERRVAL ret
#ifndef PIC
# define SYSCALL_ERROR_HANDLER \
mov.l 0f,r1; \
jmp @r1; \
mov r0,r4; \
.align 2; \
0: .long __syscall_error
#else
# if RTLD_PRIVATE_ERRNO
# define SYSCALL_ERROR_HANDLER \
neg r0,r1; \
mov r12,r2; \
cfi_register (r12, r2); \
mov.l 0f,r12; \
mova 0f,r0; \
add r0,r12; \
mov.l 1f,r0; \
mov.l r1,@(r0,r12); \
mov r2,r12; \
cfi_restore (r12); \
bra .Lpseudo_end; \
mov _IMM1,r0; \
.align 2; \
0: .long _GLOBAL_OFFSET_TABLE_; \
1: .long rtld_errno@GOTOFF
# elif defined _LIBC_REENTRANT
# if IS_IN (libc)
# define SYSCALL_ERROR_ERRNO __libc_errno
# else
# define SYSCALL_ERROR_ERRNO errno
# endif
# define SYSCALL_ERROR_HANDLER \
neg r0,r1; \
mov r12,r2; \
cfi_register (r12, r2); \
mov.l 0f,r12; \
mova 0f,r0; \
add r0,r12; \
mov.l 1f,r0; \
stc gbr, r4; \
mov.l @(r0,r12),r0; \
mov r2,r12; \
cfi_restore (r12); \
add r4,r0; \
mov.l r1,@r0; \
bra .Lpseudo_end; \
mov _IMM1,r0; \
.align 2; \
0: .long _GLOBAL_OFFSET_TABLE_; \
1: .long SYSCALL_ERROR_ERRNO@GOTTPOFF
# else
/* Store (-r0) into errno through the GOT. */
# define SYSCALL_ERROR_HANDLER \
neg r0,r1; \
mov r12,r2; \
cfi_register (r12, r2); \
mov.l 0f,r12; \
mova 0f,r0; \
add r0,r12; \
mov.l 1f,r0; \
mov.l @(r0,r12),r0; \
mov r2,r12; \
cfi_restore (r12); \
mov.l r1,@r0; \
bra .Lpseudo_end; \
mov _IMM1,r0; \
.align 2; \
0: .long _GLOBAL_OFFSET_TABLE_; \
1: .long errno@GOT
# endif /* _LIBC_REENTRANT */
#endif /* PIC */
# ifdef NEED_SYSCALL_INST_PAD
# define SYSCALL_INST_PAD \
or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0
# else
# define SYSCALL_INST_PAD
# endif
#define SYSCALL_INST0 trapa #0x10
#define SYSCALL_INST1 trapa #0x11
#define SYSCALL_INST2 trapa #0x12
#define SYSCALL_INST3 trapa #0x13
#define SYSCALL_INST4 trapa #0x14
#define SYSCALL_INST5 mov.l @(0,r15),r0; trapa #0x15
#define SYSCALL_INST6 mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16
#undef DO_CALL
#define DO_CALL(syscall_name, args) \
mov.l 1f,r3; \
SYSCALL_INST##args; \
SYSCALL_INST_PAD; \
bra 2f; \
nop; \
.align 2; \
1: .long SYS_ify (syscall_name); \
2:
#else /* not __ASSEMBLER__ */
#define SYSCALL_INST_STR0 "trapa #0x10\n\t"
#define SYSCALL_INST_STR1 "trapa #0x11\n\t"
#define SYSCALL_INST_STR2 "trapa #0x12\n\t"
#define SYSCALL_INST_STR3 "trapa #0x13\n\t"
#define SYSCALL_INST_STR4 "trapa #0x14\n\t"
#define SYSCALL_INST_STR5 "trapa #0x15\n\t"
#define SYSCALL_INST_STR6 "trapa #0x16\n\t"
# ifdef NEED_SYSCALL_INST_PAD
# define SYSCALL_INST_PAD "\
or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
# else
# define SYSCALL_INST_PAD
# endif
#define ASMFMT_0
#define ASMFMT_1 \
, "r" (r4)
#define ASMFMT_2 \
, "r" (r4), "r" (r5)
#define ASMFMT_3 \
, "r" (r4), "r" (r5), "r" (r6)
#define ASMFMT_4 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7)
#define ASMFMT_5 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0)
#define ASMFMT_6 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1)
#define ASMFMT_7 \
, "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1), "r" (r2)
#define SUBSTITUTE_ARGS_0()
#define SUBSTITUTE_ARGS_1(arg1) \
long int _arg1 = (long int) (arg1); \
register long int r4 asm ("%r4") = (long int) (_arg1)
#define SUBSTITUTE_ARGS_2(arg1, arg2) \
long int _arg1 = (long int) (arg1); \
long int _arg2 = (long int) (arg2); \
register long int r4 asm ("%r4") = (long int) (_arg1); \
register long int r5 asm ("%r5") = (long int) (_arg2)
#define SUBSTITUTE_ARGS_3(arg1, arg2, arg3) \
long int _arg1 = (long int) (arg1); \
long int _arg2 = (long int) (arg2); \
long int _arg3 = (long int) (arg3); \
register long int r4 asm ("%r4") = (long int) (_arg1); \
register long int r5 asm ("%r5") = (long int) (_arg2); \
register long int r6 asm ("%r6") = (long int) (_arg3)
#define SUBSTITUTE_ARGS_4(arg1, arg2, arg3, arg4) \
long int _arg1 = (long int) (arg1); \
long int _arg2 = (long int) (arg2); \
long int _arg3 = (long int) (arg3); \
long int _arg4 = (long int) (arg4); \
register long int r4 asm ("%r4") = (long int) (_arg1); \
register long int r5 asm ("%r5") = (long int) (_arg2); \
register long int r6 asm ("%r6") = (long int) (_arg3); \
register long int r7 asm ("%r7") = (long int) (_arg4)
#define SUBSTITUTE_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
long int _arg1 = (long int) (arg1); \
long int _arg2 = (long int) (arg2); \
long int _arg3 = (long int) (arg3); \
long int _arg4 = (long int) (arg4); \
long int _arg5 = (long int) (arg5); \
register long int r4 asm ("%r4") = (long int) (_arg1); \
register long int r5 asm ("%r5") = (long int) (_arg2); \
register long int r6 asm ("%r6") = (long int) (_arg3); \
register long int r7 asm ("%r7") = (long int) (_arg4); \
register long int r0 asm ("%r0") = (long int) (_arg5)
#define SUBSTITUTE_ARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \
long int _arg1 = (long int) (arg1); \
long int _arg2 = (long int) (arg2); \
long int _arg3 = (long int) (arg3); \
long int _arg4 = (long int) (arg4); \
long int _arg5 = (long int) (arg5); \
long int _arg6 = (long int) (arg6); \
register long int r4 asm ("%r4") = (long int)(_arg1); \
register long int r5 asm ("%r5") = (long int) (_arg2); \
register long int r6 asm ("%r6") = (long int) (_arg3); \
register long int r7 asm ("%r7") = (long int) (_arg4); \
register long int r0 asm ("%r0") = (long int) (_arg5); \
register long int r1 asm ("%r1") = (long int) (_arg6)
#define SUBSTITUTE_ARGS_7(arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
long int _arg1 = (long int) (arg1); \
long int _arg2 = (long int) (arg2); \
long int _arg3 = (long int) (arg3); \
long int _arg4 = (long int) (arg4); \
long int _arg5 = (long int) (arg5); \
long int _arg6 = (long int) (arg6); \
long int _arg7 = (long int) (arg7); \
register long int r4 asm ("%r4") = (long int) (_arg1); \
register long int r5 asm ("%r5") = (long int) (_arg2); \
register long int r6 asm ("%r6") = (long int) (_arg3); \
register long int r7 asm ("%r7") = (long int) (_arg4); \
register long int r0 asm ("%r0") = (long int) (_arg5); \
register long int r1 asm ("%r1") = (long int) (_arg6); \
register long int r2 asm ("%r2") = (long int) (_arg7)
#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, nr, args...) \
({ \
unsigned long int resultvar; \
register long int r3 asm ("%r3") = SYS_ify (name); \
SUBSTITUTE_ARGS_##nr(args); \
\
asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \
: "=z" (resultvar) \
: "r" (r3) ASMFMT_##nr \
: "memory", "t"); \
\
(int) resultvar; })
/* The _NCS variant allows non-constant syscall numbers. */
#define INTERNAL_SYSCALL_NCS(name, nr, args...) \
({ \
unsigned long int resultvar; \
register long int r3 asm ("%r3") = (name); \
SUBSTITUTE_ARGS_##nr(args); \
\
asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \
: "=z" (resultvar) \
: "r" (r3) ASMFMT_##nr \
: "memory", "t"); \
\
(int) resultvar; })
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */
#if IS_IN (rtld)
/* We cannot use the thread descriptor because in ld.so we use setjmp
earlier than the descriptor is initialized. Using a global variable
is too complicated here since we have no PC-relative addressing mode. */
#else
# ifdef __ASSEMBLER__
# define PTR_MANGLE(reg, tmp) \
stc gbr,tmp; mov.l @(POINTER_GUARD,tmp),tmp; xor tmp,reg
# define PTR_MANGLE2(reg, tmp) xor tmp,reg
# define PTR_DEMANGLE(reg, tmp) PTR_MANGLE (reg, tmp)
# define PTR_DEMANGLE2(reg, tmp) PTR_MANGLE2 (reg, tmp)
# else
# define PTR_MANGLE(var) \
(var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
# define PTR_DEMANGLE(var) PTR_MANGLE (var)
# endif
#endif
#endif /* linux/sh/sysdep.h */
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