| /* 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _LINUX_RISCV_SYSDEP_H |
| #define _LINUX_RISCV_SYSDEP_H 1 |
| |
| #include <sysdeps/unix/sysv/linux/generic/sysdep.h> |
| #include <tls.h> |
| |
| #ifdef __ASSEMBLER__ |
| |
| # include <sys/asm.h> |
| |
| # 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 RTLD_PRIVATE_ERRNO |
| # define SYSCALL_ERROR_HANDLER(name) \ |
| .Lsyscall_error ## name: \ |
| li t1, -4096; \ |
| neg a0, a0; \ |
| sw a0, rtld_errno, t1; \ |
| li a0, -1; |
| # elif 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 <errno.h> |
| #endif |
| |
| #include <sysdeps/unix/sysdep.h> |
| |
| #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 |
| |
| /* 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); \ |
| long int __sys_result = INTERNAL_SYSCALL (name, err, nr, args); \ |
| if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (__sys_result, ))) \ |
| { \ |
| __set_errno (INTERNAL_SYSCALL_ERRNO (__sys_result, )); \ |
| __sys_result = (unsigned long) -1; \ |
| } \ |
| __sys_result; }) |
| |
| # define INTERNAL_SYSCALL_DECL(err) do { } while (0) |
| |
| # define INTERNAL_SYSCALL_ERROR_P(val, err) \ |
| ((unsigned long int) (val) > -4096UL) |
| |
| # define INTERNAL_SYSCALL_ERRNO(val, err) (-val) |
| |
| # define INTERNAL_SYSCALL(name, err, nr, args...) \ |
| internal_syscall##nr (SYS_ify (name), err, args) |
| |
| # define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ |
| internal_syscall##nr (number, err, args) |
| |
| # define internal_syscall0(number, err, dummy...) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0"); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "=r" (__a0) \ |
| : "r" (__a7) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define internal_syscall1(number, err, arg0) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0") = (long int) (arg0); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "+r" (__a0) \ |
| : "r" (__a7) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define internal_syscall2(number, err, arg0, arg1) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0") = (long int) (arg0); \ |
| register long int __a1 asm ("a1") = (long int) (arg1); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "+r" (__a0) \ |
| : "r" (__a7), "r" (__a1) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define internal_syscall3(number, err, arg0, arg1, arg2) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0") = (long int) (arg0); \ |
| register long int __a1 asm ("a1") = (long int) (arg1); \ |
| register long int __a2 asm ("a2") = (long int) (arg2); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "+r" (__a0) \ |
| : "r" (__a7), "r" (__a1), "r" (__a2) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define internal_syscall4(number, err, arg0, arg1, arg2, arg3) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0") = (long int) (arg0); \ |
| register long int __a1 asm ("a1") = (long int) (arg1); \ |
| register long int __a2 asm ("a2") = (long int) (arg2); \ |
| register long int __a3 asm ("a3") = (long int) (arg3); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "+r" (__a0) \ |
| : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define internal_syscall5(number, err, arg0, arg1, arg2, arg3, arg4) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0") = (long int) (arg0); \ |
| register long int __a1 asm ("a1") = (long int) (arg1); \ |
| register long int __a2 asm ("a2") = (long int) (arg2); \ |
| register long int __a3 asm ("a3") = (long int) (arg3); \ |
| register long int __a4 asm ("a4") = (long int) (arg4); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "+r" (__a0) \ |
| : "r" (__a7), "r"(__a1), "r"(__a2), "r"(__a3), "r" (__a4) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define internal_syscall6(number, err, arg0, arg1, arg2, arg3, arg4, arg5) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0") = (long int) (arg0); \ |
| register long int __a1 asm ("a1") = (long int) (arg1); \ |
| register long int __a2 asm ("a2") = (long int) (arg2); \ |
| register long int __a3 asm ("a3") = (long int) (arg3); \ |
| register long int __a4 asm ("a4") = (long int) (arg4); \ |
| register long int __a5 asm ("a5") = (long int) (arg5); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "+r" (__a0) \ |
| : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \ |
| "r" (__a4), "r" (__a5) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define internal_syscall7(number, err, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \ |
| ({ \ |
| long int _sys_result; \ |
| \ |
| { \ |
| register long int __a7 asm ("a7") = number; \ |
| register long int __a0 asm ("a0") = (long int) (arg0); \ |
| register long int __a1 asm ("a1") = (long int) (arg1); \ |
| register long int __a2 asm ("a2") = (long int) (arg2); \ |
| register long int __a3 asm ("a3") = (long int) (arg3); \ |
| register long int __a4 asm ("a4") = (long int) (arg4); \ |
| register long int __a5 asm ("a5") = (long int) (arg5); \ |
| register long int __a6 asm ("a6") = (long int) (arg6); \ |
| __asm__ volatile ( \ |
| "scall\n\t" \ |
| : "+r" (__a0) \ |
| : "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \ |
| "r" (__a4), "r" (__a5), "r" (__a6) \ |
| : __SYSCALL_CLOBBERS); \ |
| _sys_result = __a0; \ |
| } \ |
| _sys_result; \ |
| }) |
| |
| # define __SYSCALL_CLOBBERS "memory" |
| |
| extern long int __syscall_error (long int neg_errno); |
| |
| #endif /* ! __ASSEMBLER__ */ |
| |
| /* Pointer mangling is not supported. */ |
| #define PTR_MANGLE(var) (void) (var) |
| #define PTR_DEMANGLE(var) (void) (var) |
| |
| #endif /* linux/riscv/sysdep.h */ |