diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sysdep.h | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sysdep.h deleted file mode 100644 index fe92a8ab5..000000000 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sysdep.h +++ /dev/null @@ -1,259 +0,0 @@ -/* Copyright (C) 2001-2005, 2007 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef _LINUX_X86_64_SYSDEP_H -#define _LINUX_X86_64_SYSDEP_H 1 - -/* There is some commonality. */ -#include <sys/syscall.h> -#include <sysdeps/i386/sysdep.h> - -#ifdef IS_IN_rtld -# include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */ -#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 - -/* This is a kludge to make syscalls.list find these under the names - pread and pwrite, since some kernel headers define those names - and some define the *64 names for the same system calls. */ -#if !defined __NR_pread && defined __NR_pread64 -# define __NR_pread __NR_pread64 -#endif -#if !defined __NR_pwrite && defined __NR_pwrite64 -# define __NR_pwrite __NR_pwrite64 -#endif - -/* This is to help the old kernel headers where __NR_semtimedop is not - available. */ -#ifndef __NR_semtimedop -# define __NR_semtimedop 220 -#endif - - -#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 %eax - 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 savely - test with -4095. */ - -/* We don't want the label for the error handle to be global when we define - it here. */ -# ifdef __PIC__ -# define SYSCALL_ERROR_LABEL 0f -# else -# define SYSCALL_ERROR_LABEL syscall_error -# endif - -# undef PSEUDO -# define PSEUDO(name, syscall_name, args) \ - .text; \ - ENTRY (name) \ - DO_CALL (syscall_name, args); \ - cmpq $-4095, %rax; \ - jae SYSCALL_ERROR_LABEL; \ - L(pseudo_end): - -# 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 - -# undef PSEUDO_ERRVAL -# define PSEUDO_ERRVAL(name, syscall_name, args) \ - .text; \ - ENTRY (name) \ - DO_CALL (syscall_name, args); \ - negq %rax - -# undef PSEUDO_END_ERRVAL -# define PSEUDO_END_ERRVAL(name) \ - END (name) - -# define ret_ERRVAL ret - -# ifndef __PIC__ -# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ -# elif defined(RTLD_PRIVATE_ERRNO) -# define SYSCALL_ERROR_HANDLER \ -0: \ - leaq rtld_errno(%rip), %rcx; \ - xorl %edx, %edx; \ - subq %rax, %rdx; \ - movl %edx, (%rcx); \ - orq $-1, %rax; \ - jmp L(pseudo_end); -# elif USE___THREAD -# ifndef NOT_IN_libc -# define SYSCALL_ERROR_ERRNO __libc_errno -# else -# define SYSCALL_ERROR_ERRNO errno -# endif -# define SYSCALL_ERROR_HANDLER \ -0: \ - movq SYSCALL_ERROR_ERRNO@GOTTPOFF(%rip), %rcx;\ - xorl %edx, %edx; \ - subq %rax, %rdx; \ - movl %edx, %fs:(%rcx); \ - orq $-1, %rax; \ - jmp L(pseudo_end); -# elif defined _LIBC_REENTRANT -/* Store (- %rax) into errno through the GOT. - Note that errno occupies only 4 bytes. */ -# define SYSCALL_ERROR_HANDLER \ -0: \ - xorl %edx, %edx; \ - subq %rax, %rdx; \ - pushq %rdx; \ - cfi_adjust_cfa_offset(8); \ - call __errno_location@PLT; \ - popq %rdx; \ - cfi_adjust_cfa_offset(-8); \ - movl %edx, (%rax); \ - orq $-1, %rax; \ - jmp L(pseudo_end); - -/* A quick note: it is assumed that the call to `__errno_location' does - not modify the stack! */ -# else /* Not _LIBC_REENTRANT. */ -# define SYSCALL_ERROR_HANDLER \ -0:movq errno@GOTPCREL(%RIP), %rcx; \ - xorl %edx, %edx; \ - subq %rax, %rdx; \ - movl %edx, (%rcx); \ - orq $-1, %rax; \ - jmp L(pseudo_end); -# endif /* __PIC__ */ - -/* The Linux/x86-64 kernel expects the system call parameters in - registers according to the following table: - - syscall number rax - arg 1 rdi - arg 2 rsi - arg 3 rdx - arg 4 r10 - arg 5 r8 - arg 6 r9 - - The Linux kernel uses and destroys internally these registers: - return address from - syscall rcx - eflags from syscall r11 - - Normal function call, including calls to the system call stub - functions in the libc, get the first six parameters passed in - registers and the seventh parameter and later on the stack. The - register use is as follows: - - system call number in the DO_CALL macro - arg 1 rdi - arg 2 rsi - arg 3 rdx - arg 4 rcx - arg 5 r8 - arg 6 r9 - - We have to take care that the stack is aligned to 16 bytes. When - called the stack is not aligned since the return address has just - been pushed. - - - Syscalls of more than 6 arguments are not supported. */ - -# undef DO_CALL -# define DO_CALL(syscall_name, args) \ - DOARGS_##args \ - movl $SYS_ify (syscall_name), %eax; \ - syscall; - -# define DOARGS_0 /* nothing */ -# define DOARGS_1 /* nothing */ -# define DOARGS_2 /* nothing */ -# define DOARGS_3 /* nothing */ -# define DOARGS_4 movq %rcx, %r10; -# define DOARGS_5 DOARGS_4 -# define DOARGS_6 DOARGS_5 - -#endif /* __ASSEMBLER__ */ - - -/* Pointer mangling support. */ -#if defined NOT_IN_libc && defined IS_IN_rtld -/* We cannot use the thread descriptor because in ld.so we use setjmp - earlier than the descriptor is initialized. */ -# ifdef __ASSEMBLER__ -# define PTR_MANGLE(reg) xorq __pointer_chk_guard_local(%rip), reg; \ - rolq $17, reg -# define PTR_DEMANGLE(reg) rorq $17, reg; \ - xorq __pointer_chk_guard_local(%rip), reg -# else -# define PTR_MANGLE(reg) asm ("xorq __pointer_chk_guard_local(%%rip), %0\n" \ - "rolq $17, %0" \ - : "=r" (reg) : "0" (reg)) -# define PTR_DEMANGLE(reg) asm ("rorq $17, %0\n" \ - "xorq __pointer_chk_guard_local(%%rip), %0" \ - : "=r" (reg) : "0" (reg)) -# endif -#else -# ifdef __ASSEMBLER__ -# define PTR_MANGLE(reg) xorq %fs:POINTER_GUARD, reg; \ - rolq $17, reg -# define PTR_DEMANGLE(reg) rorq $17, reg; \ - xorq %fs:POINTER_GUARD, reg -# else -# define PTR_MANGLE(var) asm ("xorq %%fs:%c2, %0\n" \ - "rolq $17, %0" \ - : "=r" (var) \ - : "0" (var), \ - "i" (offsetof (tcbhead_t, \ - pointer_guard))) -# define PTR_DEMANGLE(var) asm ("rorq $17, %0\n" \ - "xorq %%fs:%c2, %0" \ - : "=r" (var) \ - : "0" (var), \ - "i" (offsetof (tcbhead_t, \ - pointer_guard))) -# endif -#endif - -#endif /* linux/x86_64/sysdep.h */ |