mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
60f9423b6b
This patch consolidates the send Linux syscall implementation on
sysdeps/unix/sysv/linux/send{to}.c. The changes are:
1. Remove send from auto-generation syscalls.list on the architecture
that uses __NR_send.
2. Define __NR_send for architectures that supports it. It was done instead
of defining in default kernel-features.h because current Linux practice
for new ports are to implement only __NR_sendto [1] and it will
require adding new kernel-features for ports that do not require it
(aarch64 for instance).
3. Remove __ASSUME_SENDTO_FOR_SEND_SYSCALL and decide to use
__NR_sendto for send generation based on __ASSUME_SENDTO_SYSCALL.
Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu.
* sysdeps/unix/sysv/linux/sysdep.h (HAVE_INTERNAL_SEND_SYMBOL):
Define.
* sysdeps/unix/sysv/linux/aarch64/sysdep.h
(HAVE_INTERNAL_SEND_SYMBOL): Undefine.
* sysdeps/unix/sysv/linux/nios2/sysdep.h
(HAVE_INTERNAL_SEND_SYMBOL): Likewise.
* sysdeps/unix/sysv/linux/tile/sysdep.h
(HAVE_INTERNAL_SEND_SYMBOL): Likewise.
* sysdeps/unix/sysv/linux/alpha/kernel-features.h
(__ASSUME_RECV_SYSCALL): Define.
* sysdeps/unix/sysv/linux/arm/kernel-features.h
(__ASSUME_RECV_SYSCALL): Likewise.
* sysdeps/unix/sysv/linux/hppa/kernel-features.h
(__ASSUME_RECV_SYSCALL): Likewise.
* sysdeps/unix/sysv/linux/ia64/kernel-features.h
(__ASSUME_RECV_SYSCALL): Likewise.
* sysdeps/unix/sysv/linux/mips/kernel-features.h
(__ASSUME_RECV_SYSCALL): Likewise.
* sysdeps/unix/sysv/linux/i386/kernel-features.h
(__ASSUME_SENDTO_FOR_SEND_SYSCALL): Remove define.
* sysdeps/unix/sysv/linux/m68k/kernel-features.h
(__ASSUME_SENDTO_FOR_SEND_SYSCALL): Likewise.
* sysdeps/unix/sysv/linux/s390/kernel-features.h
(__ASSUME_SENDTO_FOR_SEND_SYSCALL): Likewise.
* sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove send from
auto-generation list.
* sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewike.
* sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/send.c: Simplify includes.
(__ASSUME_SENDTO_FOR_SEND_SYSCALL): Replace by
__ASSUME_SENDTO_SYSCALL.
* sysdeps/unix/sysv/linux/x86_64/send.c: Remove file.
* sysdeps/unix/sysv/linux/mips/mips64/send.c: Likewise.
* sysdeps/unix/sysv/linux/generic/send.c: Likewise.
298 lines
9.3 KiB
C
298 lines
9.3 KiB
C
/* Copyright (C) 2005-2017 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_AARCH64_SYSDEP_H
|
|
#define _LINUX_AARCH64_SYSDEP_H 1
|
|
|
|
#include <sysdeps/unix/sysdep.h>
|
|
#include <sysdeps/aarch64/sysdep.h>
|
|
#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
|
|
|
|
/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */
|
|
#include <dl-sysdep.h>
|
|
|
|
#include <tls.h>
|
|
|
|
/* In order to get __set_errno() definition in INLINE_SYSCALL. */
|
|
#ifndef __ASSEMBLER__
|
|
#include <errno.h>
|
|
#endif
|
|
|
|
/* 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 safely
|
|
test with -4095. */
|
|
|
|
# undef PSEUDO
|
|
# define PSEUDO(name, syscall_name, args) \
|
|
.text; \
|
|
ENTRY (name); \
|
|
DO_CALL (syscall_name, args); \
|
|
cmn x0, #4095; \
|
|
b.cs .Lsyscall_error;
|
|
|
|
# undef PSEUDO_END
|
|
# define PSEUDO_END(name) \
|
|
SYSCALL_ERROR_HANDLER \
|
|
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
|
|
|
|
/* The function has to return the error code. */
|
|
# undef PSEUDO_ERRVAL
|
|
# define PSEUDO_ERRVAL(name, syscall_name, args) \
|
|
.text; \
|
|
ENTRY (name) \
|
|
DO_CALL (syscall_name, args); \
|
|
neg x0, x0
|
|
|
|
# undef PSEUDO_END_ERRVAL
|
|
# define PSEUDO_END_ERRVAL(name) \
|
|
END (name)
|
|
|
|
# define ret_ERRVAL ret
|
|
|
|
# if !IS_IN (libc)
|
|
# define SYSCALL_ERROR .Lsyscall_error
|
|
# if RTLD_PRIVATE_ERRNO
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
.Lsyscall_error: \
|
|
adrp x1, C_SYMBOL_NAME(rtld_errno); \
|
|
neg w0, w0; \
|
|
str w0, [x1, :lo12:C_SYMBOL_NAME(rtld_errno)]; \
|
|
mov x0, -1; \
|
|
RET;
|
|
# else
|
|
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
.Lsyscall_error: \
|
|
adrp x1, :gottprel:errno; \
|
|
neg w2, w0; \
|
|
ldr PTR_REG(1), [x1, :gottprel_lo12:errno]; \
|
|
mrs x3, tpidr_el0; \
|
|
mov x0, -1; \
|
|
str w2, [x1, x3]; \
|
|
RET;
|
|
# endif
|
|
# else
|
|
# define SYSCALL_ERROR __syscall_error
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
.Lsyscall_error: \
|
|
b __syscall_error;
|
|
# endif
|
|
|
|
/* Linux takes system call args in registers:
|
|
syscall number x8
|
|
arg 1 x0
|
|
arg 2 x1
|
|
arg 3 x2
|
|
arg 4 x3
|
|
arg 5 x4
|
|
arg 6 x5
|
|
arg 7 x6
|
|
|
|
The compiler is going to form a call by coming here, through PSEUDO, with
|
|
arguments
|
|
syscall number in the DO_CALL macro
|
|
arg 1 x0
|
|
arg 2 x1
|
|
arg 3 x2
|
|
arg 4 x3
|
|
arg 5 x4
|
|
arg 6 x5
|
|
arg 7 x6
|
|
|
|
*/
|
|
|
|
# undef DO_CALL
|
|
# define DO_CALL(syscall_name, args) \
|
|
mov x8, SYS_ify (syscall_name); \
|
|
svc 0
|
|
|
|
#else /* not __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
|
|
|
|
/* Previously AArch64 used the generic version without the libc_hidden_def
|
|
which lead in a non existent __send symbol in libc.so. */
|
|
# undef HAVE_INTERNAL_SEND_SYMBOL
|
|
|
|
/* Define a macro which expands into the inline wrapper code for a system
|
|
call. */
|
|
# undef INLINE_SYSCALL
|
|
# define INLINE_SYSCALL(name, nr, args...) \
|
|
({ unsigned long _sys_result = INTERNAL_SYSCALL (name, , nr, args); \
|
|
if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0))\
|
|
{ \
|
|
__set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \
|
|
_sys_result = (unsigned long) -1; \
|
|
} \
|
|
(long) _sys_result; })
|
|
|
|
# undef INTERNAL_SYSCALL_DECL
|
|
# define INTERNAL_SYSCALL_DECL(err) do { } while (0)
|
|
|
|
# undef INTERNAL_SYSCALL_RAW
|
|
# define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \
|
|
({ long _sys_result; \
|
|
{ \
|
|
LOAD_ARGS_##nr (args) \
|
|
register long _x8 asm ("x8") = (name); \
|
|
asm volatile ("svc 0 // syscall " # name \
|
|
: "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr : "memory"); \
|
|
_sys_result = _x0; \
|
|
} \
|
|
_sys_result; })
|
|
|
|
# undef INTERNAL_SYSCALL
|
|
# define INTERNAL_SYSCALL(name, err, nr, args...) \
|
|
INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args)
|
|
|
|
# undef INTERNAL_SYSCALL_AARCH64
|
|
# define INTERNAL_SYSCALL_AARCH64(name, err, nr, args...) \
|
|
INTERNAL_SYSCALL_RAW(__ARM_NR_##name, err, nr, args)
|
|
|
|
# undef INTERNAL_SYSCALL_ERROR_P
|
|
# define INTERNAL_SYSCALL_ERROR_P(val, err) \
|
|
((unsigned long) (val) >= (unsigned long) -4095)
|
|
|
|
# undef INTERNAL_SYSCALL_ERRNO
|
|
# define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
|
|
|
|
# define LOAD_ARGS_0() \
|
|
register long _x0 asm ("x0");
|
|
# define LOAD_ARGS_1(x0) \
|
|
long _x0tmp = (long) (x0); \
|
|
LOAD_ARGS_0 () \
|
|
_x0 = _x0tmp;
|
|
# define LOAD_ARGS_2(x0, x1) \
|
|
long _x1tmp = (long) (x1); \
|
|
LOAD_ARGS_1 (x0) \
|
|
register long _x1 asm ("x1") = _x1tmp;
|
|
# define LOAD_ARGS_3(x0, x1, x2) \
|
|
long _x2tmp = (long) (x2); \
|
|
LOAD_ARGS_2 (x0, x1) \
|
|
register long _x2 asm ("x2") = _x2tmp;
|
|
# define LOAD_ARGS_4(x0, x1, x2, x3) \
|
|
long _x3tmp = (long) (x3); \
|
|
LOAD_ARGS_3 (x0, x1, x2) \
|
|
register long _x3 asm ("x3") = _x3tmp;
|
|
# define LOAD_ARGS_5(x0, x1, x2, x3, x4) \
|
|
long _x4tmp = (long) (x4); \
|
|
LOAD_ARGS_4 (x0, x1, x2, x3) \
|
|
register long _x4 asm ("x4") = _x4tmp;
|
|
# define LOAD_ARGS_6(x0, x1, x2, x3, x4, x5) \
|
|
long _x5tmp = (long) (x5); \
|
|
LOAD_ARGS_5 (x0, x1, x2, x3, x4) \
|
|
register long _x5 asm ("x5") = _x5tmp;
|
|
# define LOAD_ARGS_7(x0, x1, x2, x3, x4, x5, x6)\
|
|
long _x6tmp = (long) (x6); \
|
|
LOAD_ARGS_6 (x0, x1, x2, x3, x4, x5) \
|
|
register long _x6 asm ("x6") = _x6tmp;
|
|
|
|
# define ASM_ARGS_0
|
|
# define ASM_ARGS_1 , "r" (_x0)
|
|
# define ASM_ARGS_2 ASM_ARGS_1, "r" (_x1)
|
|
# define ASM_ARGS_3 ASM_ARGS_2, "r" (_x2)
|
|
# define ASM_ARGS_4 ASM_ARGS_3, "r" (_x3)
|
|
# define ASM_ARGS_5 ASM_ARGS_4, "r" (_x4)
|
|
# define ASM_ARGS_6 ASM_ARGS_5, "r" (_x5)
|
|
# define ASM_ARGS_7 ASM_ARGS_6, "r" (_x6)
|
|
|
|
# undef INTERNAL_SYSCALL_NCS
|
|
# define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
|
|
INTERNAL_SYSCALL_RAW (number, err, nr, args)
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
/* Pointer mangling is supported for AArch64. */
|
|
#if (IS_IN (rtld) || \
|
|
(!defined SHARED && (IS_IN (libc) \
|
|
|| IS_IN (libpthread))))
|
|
# ifdef __ASSEMBLER__
|
|
/* Note, dst, src, guard, and tmp are all register numbers rather than
|
|
register names so they will work with both ILP32 and LP64. */
|
|
# define PTR_MANGLE(dst, src, guard, tmp) \
|
|
LDST_PCREL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard_local)); \
|
|
PTR_MANGLE2 (dst, src, guard)
|
|
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
|
|
# define PTR_MANGLE2(dst, src, guard)\
|
|
eor x##dst, x##src, x##guard
|
|
# define PTR_DEMANGLE(dst, src, guard, tmp)\
|
|
PTR_MANGLE (dst, src, guard, tmp)
|
|
# define PTR_DEMANGLE2(dst, src, guard)\
|
|
PTR_MANGLE2 (dst, src, guard)
|
|
# else
|
|
extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
|
|
# define PTR_MANGLE(var) \
|
|
(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
|
|
# define PTR_DEMANGLE(var) PTR_MANGLE (var)
|
|
# endif
|
|
#else
|
|
# ifdef __ASSEMBLER__
|
|
/* Note, dst, src, guard, and tmp are all register numbers rather than
|
|
register names so they will work with both ILP32 and LP64. */
|
|
# define PTR_MANGLE(dst, src, guard, tmp) \
|
|
LDST_GLOBAL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard)); \
|
|
PTR_MANGLE2 (dst, src, guard)
|
|
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
|
|
# define PTR_MANGLE2(dst, src, guard)\
|
|
eor x##dst, x##src, x##guard
|
|
# define PTR_DEMANGLE(dst, src, guard, tmp)\
|
|
PTR_MANGLE (dst, src, guard, tmp)
|
|
# define PTR_DEMANGLE2(dst, src, guard)\
|
|
PTR_MANGLE2 (dst, src, guard)
|
|
# else
|
|
extern uintptr_t __pointer_chk_guard attribute_relro;
|
|
# define PTR_MANGLE(var) \
|
|
(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
|
|
# define PTR_DEMANGLE(var) PTR_MANGLE (var)
|
|
# endif
|
|
#endif
|
|
|
|
#endif /* linux/aarch64/sysdep.h */
|