diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/nios2/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/nios2/sysdep.h | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/nios2/sysdep.h b/sysdeps/unix/sysv/linux/nios2/sysdep.h new file mode 100644 index 0000000000..66a77f4716 --- /dev/null +++ b/sysdeps/unix/sysv/linux/nios2/sysdep.h @@ -0,0 +1,260 @@ +/* Assembler macros for Nios II. + Copyright (C) 2000-2015 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_NIOS2_SYSDEP_H +#define _LINUX_NIOS2_SYSDEP_H 1 + +#include <asm/unistd.h> +#include <sysdeps/unix/sysdep.h> +#include <sysdeps/nios2/sysdep.h> +#include <sysdeps/unix/sysv/linux/generic/sysdep.h> + +/* For RTLD_PRIVATE_ERRNO. */ +#include <dl-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__ + +#define SYSCALL_ERROR_LABEL __local_syscall_error + +#undef PSEUDO +#define PSEUDO(name, syscall_name, args) \ + ENTRY (name) \ + DO_CALL (syscall_name, args) \ + bne r7, zero, SYSCALL_ERROR_LABEL; \ + +#undef PSEUDO_END +#define PSEUDO_END(name) \ + SYSCALL_ERROR_HANDLER \ + END (name) + +#undef PSEUDO_NOERRNO +#define PSEUDO_NOERRNO(name, syscall_name, args) \ + ENTRY (name) \ + DO_CALL (syscall_name, args) + +#undef PSEUDO_END_NOERRNO +#define PSEUDO_END_NOERRNO(name) \ + END (name) + +#undef ret_NOERRNO +#define ret_NOERRNO ret + +#undef DO_CALL +#define DO_CALL(syscall_name, args) \ + DOARGS_##args \ + movi r2, SYS_ify(syscall_name); \ + trap; + +#if defined(__PIC__) || defined(PIC) + +# if RTLD_PRIVATE_ERRNO + +# define SYSCALL_ERROR_HANDLER \ + SYSCALL_ERROR_LABEL: \ + nextpc r3; \ +1: \ + movhi r8, %hiadj(rtld_errno - 1b); \ + addi r8, r8, %lo(rtld_errno - 1b); \ + add r3, r3, r8; \ + stw r2, 0(r3); \ + movi r2, -1; \ + ret; + +# else + +# if IS_IN (libc) +# define SYSCALL_ERROR_ERRNO __libc_errno +# else +# define SYSCALL_ERROR_ERRNO errno +# endif +# define SYSCALL_ERROR_HANDLER \ + SYSCALL_ERROR_LABEL: \ + nextpc r3; \ +1: \ + movhi r8, %hiadj(_gp_got - 1b); \ + addi r8, r8, %lo(_gp_got - 1b); \ + add r3, r3, r8; \ + ldw r3, %tls_ie(SYSCALL_ERROR_ERRNO)(r3); \ + add r3, r23, r3; \ + stw r2, 0(r3); \ + movi r2, -1; \ + ret; + +# endif + +#else + +/* We can use a single error handler in the static library. */ +#define SYSCALL_ERROR_HANDLER \ + SYSCALL_ERROR_LABEL: \ + jmpi __syscall_error; + +#endif + +#define DOARGS_0 /* nothing */ +#define DOARGS_1 /* nothing */ +#define DOARGS_2 /* nothing */ +#define DOARGS_3 /* nothing */ +#define DOARGS_4 /* nothing */ +#define DOARGS_5 ldw r8, 0(sp); +#define DOARGS_6 ldw r9, 4(sp); ldw r8, 0(sp); + +/* The function has to return the error code. */ +#undef PSEUDO_ERRVAL +#define PSEUDO_ERRVAL(name, syscall_name, args) \ + ENTRY (name) \ + DO_CALL (syscall_name, args) + +#undef PSEUDO_END_ERRVAL +#define PSEUDO_END_ERRVAL(name) \ + END (name) + +#define ret_ERRVAL ret + +#else /* __ASSEMBLER__ */ + +/* In order to get __set_errno() definition in INLINE_SYSCALL. */ +#include <errno.h> + +/* Define a macro which expands into the inline wrapper code for a system + call. */ +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) \ + ({ INTERNAL_SYSCALL_DECL(err); \ + unsigned int result_var = INTERNAL_SYSCALL (name, err, nr, args); \ + if ( INTERNAL_SYSCALL_ERROR_P (result_var, err) ) \ + { \ + __set_errno (INTERNAL_SYSCALL_ERRNO (result_var, err)); \ + result_var = -1L; \ + } \ + (int) result_var; }) + +#undef INTERNAL_SYSCALL_DECL +#define INTERNAL_SYSCALL_DECL(err) unsigned int err __attribute__((unused)) + +#undef INTERNAL_SYSCALL_ERROR_P +#define INTERNAL_SYSCALL_ERROR_P(val, err) ((void) (val), (unsigned int) (err)) + +#undef INTERNAL_SYSCALL_ERRNO +#define INTERNAL_SYSCALL_ERRNO(val, err) ((void) (err), val) + +#undef INTERNAL_SYSCALL_RAW +#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \ + ({ unsigned int _sys_result; \ + { \ + /* Load argument values in temporary variables + to perform side effects like function calls + before the call-used registers are set. */ \ + LOAD_ARGS_##nr (args) \ + LOAD_REGS_##nr \ + register int _r2 asm ("r2") = (int)(name); \ + register int _err asm ("r7"); \ + asm volatile ("trap" \ + : "+r" (_r2), "=r" (_err) \ + : ASM_ARGS_##nr \ + : __SYSCALL_CLOBBERS); \ + _sys_result = _r2; \ + err = _err; \ + } \ + (int) _sys_result; }) + +#undef INTERNAL_SYSCALL +#define INTERNAL_SYSCALL(name, err, nr, args...) \ + INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args) + +#undef INTERNAL_SYSCALL_NCS +#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ + INTERNAL_SYSCALL_RAW(number, err, nr, args) + +#define LOAD_ARGS_0() +#define LOAD_REGS_0 +#define ASM_ARGS_0 +#define LOAD_ARGS_1(a1) \ + LOAD_ARGS_0 () \ + int __arg1 = (int) (a1); +#define LOAD_REGS_1 \ + register int _r4 asm ("r4") = __arg1; \ + LOAD_REGS_0 +#define ASM_ARGS_1 "r" (_r4) +#define LOAD_ARGS_2(a1, a2) \ + LOAD_ARGS_1 (a1) \ + int __arg2 = (int) (a2); +#define LOAD_REGS_2 \ + register int _r5 asm ("r5") = __arg2; \ + LOAD_REGS_1 +#define ASM_ARGS_2 ASM_ARGS_1, "r" (_r5) +#define LOAD_ARGS_3(a1, a2, a3) \ + LOAD_ARGS_2 (a1, a2) \ + int __arg3 = (int) (a3); +#define LOAD_REGS_3 \ + register int _r6 asm ("r6") = __arg3; \ + LOAD_REGS_2 +#define ASM_ARGS_3 ASM_ARGS_2, "r" (_r6) +#define LOAD_ARGS_4(a1, a2, a3, a4) \ + LOAD_ARGS_3 (a1, a2, a3) \ + int __arg4 = (int) (a4); +#define LOAD_REGS_4 \ + register int _r7 asm ("r7") = __arg4; \ + LOAD_REGS_3 +#define ASM_ARGS_4 ASM_ARGS_3, "r" (_r7) +#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \ + LOAD_ARGS_4 (a1, a2, a3, a4) \ + int __arg5 = (int) (a5); +#define LOAD_REGS_5 \ + register int _r8 asm ("r8") = __arg5; \ + LOAD_REGS_4 +#define ASM_ARGS_5 ASM_ARGS_4, "r" (_r8) +#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \ + LOAD_ARGS_5 (a1, a2, a3, a4, a5) \ + int __arg6 = (int) (a6); +#define LOAD_REGS_6 \ + register int _r9 asm ("r9") = __arg6; \ + LOAD_REGS_5 +#define ASM_ARGS_6 ASM_ARGS_5, "r" (_r9) + +#define __SYSCALL_CLOBBERS "memory" + +#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. */ +#else +# ifdef __ASSEMBLER__ +# define PTR_MANGLE_GUARD(guard) ldw guard, POINTER_GUARD(r23) +# define PTR_MANGLE(dst, src, guard) xor dst, src, guard +# define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard) +# else +# define PTR_MANGLE(var) \ + (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ()) +# define PTR_DEMANGLE(var) PTR_MANGLE (var) +# endif +#endif + + +#endif /* linux/nios2/sysdep.h */ |