From 9595fb8cd595028bece5174e7eddf660ae3dcc10 Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb Date: Thu, 31 May 2018 01:04:17 +0200 Subject: risc-v: initial 64 bit port, static only (no TLS/NPTL) Only a simple hello world is tested in qemu system emulation. --- libc/sysdeps/linux/riscv64/sysdep.h | 125 ++++++++++++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) create mode 100644 libc/sysdeps/linux/riscv64/sysdep.h (limited to 'libc/sysdeps/linux/riscv64/sysdep.h') diff --git a/libc/sysdeps/linux/riscv64/sysdep.h b/libc/sysdeps/linux/riscv64/sysdep.h new file mode 100644 index 000000000..b12329332 --- /dev/null +++ b/libc/sysdeps/linux/riscv64/sysdep.h @@ -0,0 +1,125 @@ +/* Assembly macros for RISC-V. + Copyright (C) 2011-2018 + 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 + . */ + +#ifndef _LINUX_RISCV_SYSDEP_H +#define _LINUX_RISCV_SYSDEP_H 1 + +#include + +#ifdef __ASSEMBLER__ + +# include + +# define ENTRY(name) LEAF(name) + +# define L(label) .L ## label + +/* Performs a system call, handling errors by setting errno. Linux indicates + errors by setting a0 to a value between -1 and -4095. */ +# undef PSEUDO +# define PSEUDO(name, syscall_name, args) \ + .text; \ + .align 2; \ + ENTRY (name); \ + li a7, SYS_ify (syscall_name); \ + scall; \ + li a7, -4096; \ + bgtu a0, a7, .Lsyscall_error ## name; + +# undef PSEUDO_END +# define PSEUDO_END(sym) \ + SYSCALL_ERROR_HANDLER (sym) \ + ret; \ + END (sym) + +# if !IS_IN_libc +# if defined (__PIC__) +# define SYSCALL_ERROR_HANDLER(name) \ +.Lsyscall_error ## name: \ + la.tls.ie t1, errno; \ + add t1, t1, tp; \ + neg a0, a0; \ + sw a0, 0(t1); \ + li a0, -1; +# else +# define SYSCALL_ERROR_HANDLER(name) \ +.Lsyscall_error ## name: \ + lui t1, %tprel_hi(errno); \ + add t1, t1, tp, %tprel_add(errno); \ + neg a0, a0; \ + sw a0, %tprel_lo(errno)(t1); \ + li a0, -1; +# endif +# else +# define SYSCALL_ERROR_HANDLER(name) \ +.Lsyscall_error ## name: \ + j __syscall_error; +# endif + +/* Performs a system call, not setting errno. */ +# undef PSEUDO_NEORRNO +# define PSEUDO_NOERRNO(name, syscall_name, args) \ + .align 2; \ + ENTRY (name); \ + li a7, SYS_ify (syscall_name); \ + scall; + +# undef PSEUDO_END_NOERRNO +# define PSEUDO_END_NOERRNO(name) \ + END (name) + +# undef ret_NOERRNO +# define ret_NOERRNO ret + +/* Perfroms a system call, returning the error code. */ +# undef PSEUDO_ERRVAL +# define PSEUDO_ERRVAL(name, syscall_name, args) \ + PSEUDO_NOERRNO (name, syscall_name, args) \ + neg a0, a0; + +# undef PSEUDO_END_ERRVAL +# define PSEUDO_END_ERRVAL(name) \ + END (name) + +# undef ret_ERRVAL +# define ret_ERRVAL ret + +#endif /* __ASSEMBLER__ */ + +/* In order to get __set_errno() definition in INLINE_SYSCALL. */ +#ifndef __ASSEMBLER__ +# include +#endif + +#undef SYS_ify +#define SYS_ify(syscall_name) __NR_##syscall_name + +#ifndef __ASSEMBLER__ + +/* List of system calls which are supported as vsyscalls. */ +# define HAVE_CLOCK_GETRES_VSYSCALL 1 +# define HAVE_CLOCK_GETTIME_VSYSCALL 1 +# define HAVE_GETTIMEOFDAY_VSYSCALL 1 +# define HAVE_GETCPU_VSYSCALL 1 + + +extern long int __syscall_error (long int neg_errno); + +#endif /* ! __ASSEMBLER__ */ + +#endif /* linux/riscv/sysdep.h */ -- cgit v1.2.3