LoongArch: Linux Syscall Interface

1 files changed, 320 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/loongarch/sysdep.h b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
new file mode 100644
index 0000000..c586df8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/sysdep.h
@@ -0,0 +1,320 @@
+/* Assembly macros for LoongArch.
+   Copyright (C) 2022 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_LOONGARCH_SYSDEP_H
+#define _LINUX_LOONGARCH_SYSDEP_H 1
+
+#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
+#include <tls.h>
+
+#ifdef __ASSEMBLER__
+
+#include <sys/asm.h>
+#define ret jirl zero, ra, 0
+#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) \
+  ENTRY (name); \
+  li.d a7, SYS_ify (syscall_name); \
+  syscall 0; \
+  li.d a7, -4096; \
+  bltu a7, a0, .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 : la t0, rtld_errno; \
+  sub.w a0, zero, a0; \
+  st.w a0, t0, 0; \
+  li.d a0, -1;
+
+#else
+
+#define SYSCALL_ERROR_HANDLER(name) \
+  .Lsyscall_error##name : la.tls.ie t0, errno; \
+  add.d t0, tp, t0; \
+  sub.w a0, zero, a0; \
+  st.w a0, t0, 0; \
+  li.d a0, -1;
+
+#endif
+#else
+
+#define SYSCALL_ERROR_HANDLER(name) .Lsyscall_error##name : b __syscall_error;
+
+#endif
+
+/* Performs a system call, not setting errno.  */
+#undef PSEUDO_NEORRNO
+#define PSEUDO_NOERRNO(name, syscall_name, args) \
+  ENTRY (name); \
+  li.d a7, SYS_ify (syscall_name); \
+  syscall 0;
+
+#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); \
+  slli.d a0, a0, 32; \
+  srai.d a0, a0, 32; /* sign_ext */ \
+  sub.d a0, zero, 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__
+
+#define VDSO_NAME "LINUX_2.6"
+#define VDSO_HASH 61765110
+
+/* List of system calls which are supported as vsyscalls.  */
+#define HAVE_CLOCK_GETRES64_VSYSCALL "__vdso_clock_getres"
+#define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime"
+#define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
+
+#define HAVE_CLONE3_WRAPPER 1
+
+#define INTERNAL_SYSCALL(name, nr, args...) \
+  internal_syscall##nr (SYS_ify (name), args)
+
+#define INTERNAL_SYSCALL_NCS(number, nr, args...) \
+  internal_syscall##nr (number, args)
+
+#define internal_syscall0(number, dummy...) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0"); \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "=r"(__a0) \
+		       : "r"(__a7) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall1(number, arg0) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall2(number, arg0, arg1) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall3(number, arg0, arg1, arg2) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall4(number, arg0, arg1, arg2, arg3) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      long int _arg3 = (long int) (arg3); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall5(number, arg0, arg1, arg2, arg3, arg4) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      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 __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      register long int __a4 asm ("$a4") = _arg4; \
+      __asm__ volatile ("syscall 0\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, arg0, arg1, arg2, arg3, arg4, arg5) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      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 __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      register long int __a4 asm ("$a4") = _arg4; \
+      register long int __a5 asm ("$a5") = _arg5; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3), \
+			 "r"(__a4), "r"(__a5) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define internal_syscall7(number, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
+  ({ \
+    long int _sys_result; \
+\
+    { \
+      long int _arg0 = (long int) (arg0); \
+      long int _arg1 = (long int) (arg1); \
+      long int _arg2 = (long int) (arg2); \
+      long int _arg3 = (long int) (arg3); \
+      long int _arg4 = (long int) (arg4); \
+      long int _arg5 = (long int) (arg5); \
+      long int _arg6 = (long int) (arg6); \
+      register long int __a7 asm ("$a7") = number; \
+      register long int __a0 asm ("$a0") = _arg0; \
+      register long int __a1 asm ("$a1") = _arg1; \
+      register long int __a2 asm ("$a2") = _arg2; \
+      register long int __a3 asm ("$a3") = _arg3; \
+      register long int __a4 asm ("$a4") = _arg4; \
+      register long int __a5 asm ("$a5") = _arg5; \
+      register long int __a6 asm ("$a6") = _arg6; \
+      __asm__ volatile ("syscall 0\n\t" \
+		       : "+r"(__a0) \
+		       : "r"(__a7), "r"(__a1), "r"(__a2), "r"(__a3), \
+			 "r"(__a4), "r"(__a5), "r"(__a6) \
+		       : __SYSCALL_CLOBBERS); \
+      _sys_result = __a0; \
+    } \
+    _sys_result; \
+  })
+
+#define __SYSCALL_CLOBBERS \
+  "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8", "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/loongarch/sysdep.h */