393 lines
13 KiB
C
393 lines
13 KiB
C
/* Copyright (C) 2001-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _LINUX_X86_64_SYSDEP_H
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#define _LINUX_X86_64_SYSDEP_H 1
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/* There is some commonality. */
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/unix/x86_64/sysdep.h>
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#include <tls.h>
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#if IS_IN (rtld)
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# include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
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#endif
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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so we have to redefine the `SYS_ify' macro here. */
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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/* This is a kludge to make syscalls.list find these under the names
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pread and pwrite, since some kernel headers define those names
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and some define the *64 names for the same system calls. */
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#if !defined __NR_pread && defined __NR_pread64
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# define __NR_pread __NR_pread64
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#endif
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#if !defined __NR_pwrite && defined __NR_pwrite64
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# define __NR_pwrite __NR_pwrite64
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#endif
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/* This is to help the old kernel headers where __NR_semtimedop is not
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available. */
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#ifndef __NR_semtimedop
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# define __NR_semtimedop 220
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#endif
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#ifdef __ASSEMBLER__
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/* Linux uses a negative return value to indicate syscall errors,
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unlike most Unices, which use the condition codes' carry flag.
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Since version 2.1 the return value of a system call might be
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negative even if the call succeeded. E.g., the `lseek' system call
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might return a large offset. Therefore we must not anymore test
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for < 0, but test for a real error by making sure the value in %eax
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is a real error number. Linus said he will make sure the no syscall
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returns a value in -1 .. -4095 as a valid result so we can savely
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test with -4095. */
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/* We don't want the label for the error handle to be global when we define
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it here. */
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# ifdef PIC
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# define SYSCALL_ERROR_LABEL 0f
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# else
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# define SYSCALL_ERROR_LABEL syscall_error
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# endif
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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cmpq $-4095, %rax; \
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jae SYSCALL_ERROR_LABEL
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# undef PSEUDO_END
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# define PSEUDO_END(name) \
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SYSCALL_ERROR_HANDLER \
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END (name)
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# undef PSEUDO_NOERRNO
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# define PSEUDO_NOERRNO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args)
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# undef PSEUDO_END_NOERRNO
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# define PSEUDO_END_NOERRNO(name) \
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END (name)
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# define ret_NOERRNO ret
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# undef PSEUDO_ERRVAL
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# define PSEUDO_ERRVAL(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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negq %rax
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# undef PSEUDO_END_ERRVAL
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# define PSEUDO_END_ERRVAL(name) \
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END (name)
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# define ret_ERRVAL ret
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# if defined PIC && defined RTLD_PRIVATE_ERRNO
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# define SYSCALL_SET_ERRNO \
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lea rtld_errno(%rip), %RCX_LP; \
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neg %eax; \
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movl %eax, (%rcx)
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# else
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# if IS_IN (libc)
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# define SYSCALL_ERROR_ERRNO __libc_errno
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# else
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# define SYSCALL_ERROR_ERRNO errno
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# endif
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# define SYSCALL_SET_ERRNO \
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movq SYSCALL_ERROR_ERRNO@GOTTPOFF(%rip), %rcx;\
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neg %eax; \
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movl %eax, %fs:(%rcx);
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# endif
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# ifndef PIC
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# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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# else
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# define SYSCALL_ERROR_HANDLER \
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0: \
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SYSCALL_SET_ERRNO; \
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or $-1, %RAX_LP; \
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ret;
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# endif /* PIC */
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/* The Linux/x86-64 kernel expects the system call parameters in
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registers according to the following table:
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syscall number rax
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arg 1 rdi
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arg 2 rsi
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arg 3 rdx
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arg 4 r10
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arg 5 r8
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arg 6 r9
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The Linux kernel uses and destroys internally these registers:
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return address from
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syscall rcx
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eflags from syscall r11
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Normal function call, including calls to the system call stub
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functions in the libc, get the first six parameters passed in
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registers and the seventh parameter and later on the stack. The
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register use is as follows:
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system call number in the DO_CALL macro
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arg 1 rdi
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arg 2 rsi
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arg 3 rdx
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arg 4 rcx
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arg 5 r8
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arg 6 r9
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We have to take care that the stack is aligned to 16 bytes. When
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called the stack is not aligned since the return address has just
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been pushed.
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Syscalls of more than 6 arguments are not supported. */
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# undef DO_CALL
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# define DO_CALL(syscall_name, args) \
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DOARGS_##args \
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movl $SYS_ify (syscall_name), %eax; \
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syscall;
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# define DOARGS_0 /* nothing */
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# define DOARGS_1 /* nothing */
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# define DOARGS_2 /* nothing */
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# define DOARGS_3 /* nothing */
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# define DOARGS_4 movq %rcx, %r10;
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# define DOARGS_5 DOARGS_4
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# define DOARGS_6 DOARGS_5
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#else /* !__ASSEMBLER__ */
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/* Define a macro which expands inline into the wrapper code for a system
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call. */
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# undef INLINE_SYSCALL
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# define INLINE_SYSCALL(name, nr, args...) \
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({ \
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unsigned long int resultvar = INTERNAL_SYSCALL (name, , nr, args); \
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if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, ))) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, )); \
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resultvar = (unsigned long int) -1; \
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} \
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(long int) resultvar; })
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/* Define a macro with explicit types for arguments, which expands inline
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into the wrapper code for a system call. It should be used when size
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of any argument > size of long int. */
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# undef INLINE_SYSCALL_TYPES
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# define INLINE_SYSCALL_TYPES(name, nr, args...) \
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({ \
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unsigned long int resultvar = INTERNAL_SYSCALL_TYPES (name, , nr, args); \
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if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, ))) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, )); \
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resultvar = (unsigned long int) -1; \
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} \
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(long int) resultvar; })
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# undef INTERNAL_SYSCALL_DECL
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# define INTERNAL_SYSCALL_DECL(err) do { } while (0)
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/* Registers clobbered by syscall. */
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# define REGISTERS_CLOBBERED_BY_SYSCALL "cc", "r11", "cx"
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# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
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({ \
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unsigned long int resultvar; \
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LOAD_ARGS_##nr (args) \
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LOAD_REGS_##nr \
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asm volatile ( \
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"syscall\n\t" \
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: "=a" (resultvar) \
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: "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL); \
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(long int) resultvar; })
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# undef INTERNAL_SYSCALL
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# define INTERNAL_SYSCALL(name, err, nr, args...) \
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INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
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# define INTERNAL_SYSCALL_NCS_TYPES(name, err, nr, args...) \
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({ \
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unsigned long int resultvar; \
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LOAD_ARGS_TYPES_##nr (args) \
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LOAD_REGS_TYPES_##nr (args) \
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asm volatile ( \
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"syscall\n\t" \
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: "=a" (resultvar) \
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: "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL); \
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(long int) resultvar; })
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# undef INTERNAL_SYSCALL_TYPES
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# define INTERNAL_SYSCALL_TYPES(name, err, nr, args...) \
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INTERNAL_SYSCALL_NCS_TYPES (__NR_##name, err, nr, ##args)
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# undef INTERNAL_SYSCALL_ERROR_P
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# define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((unsigned long int) (long int) (val) >= -4095L)
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# undef INTERNAL_SYSCALL_ERRNO
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# define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
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/* List of system calls which are supported as vsyscalls. */
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# define HAVE_CLOCK_GETTIME_VSYSCALL 1
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# define HAVE_GETTIMEOFDAY_VSYSCALL 1
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# define HAVE_GETCPU_VSYSCALL 1
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# define LOAD_ARGS_0()
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# define LOAD_REGS_0
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# define ASM_ARGS_0
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# define LOAD_ARGS_TYPES_1(t1, a1) \
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t1 __arg1 = (t1) (a1); \
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LOAD_ARGS_0 ()
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# define LOAD_REGS_TYPES_1(t1, a1) \
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register t1 _a1 asm ("rdi") = __arg1; \
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LOAD_REGS_0
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# define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1)
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# define LOAD_ARGS_1(a1) \
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LOAD_ARGS_TYPES_1 (long int, a1)
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# define LOAD_REGS_1 \
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LOAD_REGS_TYPES_1 (long int, a1)
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# define LOAD_ARGS_TYPES_2(t1, a1, t2, a2) \
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t2 __arg2 = (t2) (a2); \
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LOAD_ARGS_TYPES_1 (t1, a1)
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# define LOAD_REGS_TYPES_2(t1, a1, t2, a2) \
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register t2 _a2 asm ("rsi") = __arg2; \
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LOAD_REGS_TYPES_1(t1, a1)
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# define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2)
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# define LOAD_ARGS_2(a1, a2) \
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LOAD_ARGS_TYPES_2 (long int, a1, long int, a2)
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# define LOAD_REGS_2 \
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LOAD_REGS_TYPES_2 (long int, a1, long int, a2)
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# define LOAD_ARGS_TYPES_3(t1, a1, t2, a2, t3, a3) \
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t3 __arg3 = (t3) (a3); \
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LOAD_ARGS_TYPES_2 (t1, a1, t2, a2)
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# define LOAD_REGS_TYPES_3(t1, a1, t2, a2, t3, a3) \
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register t3 _a3 asm ("rdx") = __arg3; \
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LOAD_REGS_TYPES_2(t1, a1, t2, a2)
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# define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3)
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# define LOAD_ARGS_3(a1, a2, a3) \
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LOAD_ARGS_TYPES_3 (long int, a1, long int, a2, long int, a3)
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# define LOAD_REGS_3 \
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LOAD_REGS_TYPES_3 (long int, a1, long int, a2, long int, a3)
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# define LOAD_ARGS_TYPES_4(t1, a1, t2, a2, t3, a3, t4, a4) \
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t4 __arg4 = (t4) (a4); \
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LOAD_ARGS_TYPES_3 (t1, a1, t2, a2, t3, a3)
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# define LOAD_REGS_TYPES_4(t1, a1, t2, a2, t3, a3, t4, a4) \
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register t4 _a4 asm ("r10") = __arg4; \
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LOAD_REGS_TYPES_3(t1, a2, t2, a2, t3, a3)
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# define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4)
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# define LOAD_ARGS_4(a1, a2, a3, a4) \
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LOAD_ARGS_TYPES_4 (long int, a1, long int, a2, long int, a3, \
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long int, a4)
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# define LOAD_REGS_4 \
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LOAD_REGS_TYPES_4 (long int, a1, long int, a2, long int, a3, \
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long int, a4)
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# define LOAD_ARGS_TYPES_5(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5) \
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t5 __arg5 = (t5) (a5); \
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LOAD_ARGS_TYPES_4 (t1, a1, t2, a2, t3, a3, t4, a4)
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# define LOAD_REGS_TYPES_5(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5) \
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register t5 _a5 asm ("r8") = __arg5; \
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LOAD_REGS_TYPES_4 (t1, a1, t2, a2, t3, a3, t4, a4)
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# define ASM_ARGS_5 ASM_ARGS_4, "r" (_a5)
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# define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
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LOAD_ARGS_TYPES_5 (long int, a1, long int, a2, long int, a3, \
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long int, a4, long int, a5)
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# define LOAD_REGS_5 \
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LOAD_REGS_TYPES_5 (long int, a1, long int, a2, long int, a3, \
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long int, a4, long int, a5)
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# define LOAD_ARGS_TYPES_6(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5, t6, a6) \
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t6 __arg6 = (t6) (a6); \
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LOAD_ARGS_TYPES_5 (t1, a1, t2, a2, t3, a3, t4, a4, t5, a5)
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# define LOAD_REGS_TYPES_6(t1, a1, t2, a2, t3, a3, t4, a4, t5, a5, t6, a6) \
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register t6 _a6 asm ("r9") = __arg6; \
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LOAD_REGS_TYPES_5 (t1, a1, t2, a2, t3, a3, t4, a4, t5, a5)
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# define ASM_ARGS_6 ASM_ARGS_5, "r" (_a6)
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# define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
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LOAD_ARGS_TYPES_6 (long int, a1, long int, a2, long int, a3, \
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long int, a4, long int, a5, long int, a6)
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# define LOAD_REGS_6 \
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LOAD_REGS_TYPES_6 (long int, a1, long int, a2, long int, a3, \
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long int, a4, long int, a5, long int, a6)
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#endif /* __ASSEMBLER__ */
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/* Pointer mangling support. */
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#if IS_IN (rtld)
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/* We cannot use the thread descriptor because in ld.so we use setjmp
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earlier than the descriptor is initialized. */
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# ifdef __ASSEMBLER__
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# define PTR_MANGLE(reg) xor __pointer_chk_guard_local(%rip), reg; \
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rol $2*LP_SIZE+1, reg
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# define PTR_DEMANGLE(reg) ror $2*LP_SIZE+1, reg; \
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xor __pointer_chk_guard_local(%rip), reg
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# else
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# define PTR_MANGLE(reg) asm ("xor __pointer_chk_guard_local(%%rip), %0\n" \
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"rol $2*" LP_SIZE "+1, %0" \
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: "=r" (reg) : "0" (reg))
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# define PTR_DEMANGLE(reg) asm ("ror $2*" LP_SIZE "+1, %0\n" \
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"xor __pointer_chk_guard_local(%%rip), %0" \
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: "=r" (reg) : "0" (reg))
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# endif
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#else
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# ifdef __ASSEMBLER__
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# define PTR_MANGLE(reg) xor %fs:POINTER_GUARD, reg; \
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rol $2*LP_SIZE+1, reg
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# define PTR_DEMANGLE(reg) ror $2*LP_SIZE+1, reg; \
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xor %fs:POINTER_GUARD, reg
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# else
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# define PTR_MANGLE(var) asm ("xor %%fs:%c2, %0\n" \
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"rol $2*" LP_SIZE "+1, %0" \
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: "=r" (var) \
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: "0" (var), \
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"i" (offsetof (tcbhead_t, \
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pointer_guard)))
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# define PTR_DEMANGLE(var) asm ("ror $2*" LP_SIZE "+1, %0\n" \
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"xor %%fs:%c2, %0" \
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: "=r" (var) \
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: "0" (var), \
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"i" (offsetof (tcbhead_t, \
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pointer_guard)))
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# endif
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#endif
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/* How to pass the off{64}_t argument on p{readv,writev}{64}. */
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#undef LO_HI_LONG
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#define LO_HI_LONG(val) (val)
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#endif /* linux/x86_64/sysdep.h */
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