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/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
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. */
#include <sysdep.h>
#include <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif
#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name) \
L(name##START): \
cmpl $0, %gs:MULTIPLE_THREADS_OFFSET; \
jne L(pseudo_cancel); \
.type __##syscall_name##_nocancel,@function; \
.globl __##syscall_name##_nocancel; \
__##syscall_name##_nocancel: \
DO_CALL (syscall_name, args); \
cmpl $-4095, %eax; \
jae SYSCALL_ERROR_LABEL; \
ret; \
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
L(pseudo_cancel): \
CENABLE \
SAVE_OLDTYPE_##args \
PUSHCARGS_##args \
DOCARGS_##args \
movl $SYS_ify (syscall_name), %eax; \
ENTER_KERNEL; \
POPCARGS_##args; \
POPSTATE_##args \
cmpl $-4095, %eax; \
jae SYSCALL_ERROR_LABEL; \
L(pseudo_end): \
\
/* Create unwinding information for the syscall wrapper. */ \
.section .eh_frame,"a",@progbits; \
L(STARTFRAME): \
/* Length of the CIE. */ \
.long L(ENDCIE)-L(STARTCIE); \
L(STARTCIE): \
/* CIE ID. */ \
.long 0; \
/* Version number. */ \
.byte 1; \
/* NUL-terminated augmentation string. */ \
AUGMENTATION_STRING; \
/* Code alignment factor. */ \
.uleb128 1; \
/* Data alignment factor. */ \
.sleb128 -4; \
/* Return address register column. */ \
.byte 8; \
/* Optional augmentation parameter. */ \
AUGMENTATION_PARAM \
/* Start of the table initialization. */ \
.byte 0xc; /* DW_CFA_def_cfa */ \
.uleb128 4; \
.uleb128 4; \
.byte 0x88; /* DW_CFA_offset, column 0x8 */ \
.uleb128 1; \
.align 4; \
L(ENDCIE): \
/* Length of the FDE. */ \
.long L(ENDFDE)-L(STARTFDE); \
L(STARTFDE): \
/* CIE pointer. */ \
.long L(STARTFDE)-L(STARTFRAME); \
/* Start address of the code. */ \
START_SYMBOL_REF (name); \
/* Length of the code. */ \
.long L(name##END)-L(name##START); \
/* Augmentation data. */ \
AUGMENTATION_PARAM_FDE \
/* The rest of the code depends on the number of parameters the syscall \
takes. */ \
EH_FRAME_##args(name); \
.align 4; \
L(ENDFDE): \
.previous
# ifdef SHARED
/* NUL-terminated augmentation string. Note "z" means there is an
augmentation value later on. */
# define AUGMENTATION_STRING .string "zR"
# define AUGMENTATION_PARAM \
/* Augmentation value length. */ \
.uleb128 1; \
/* Encoding: DW_EH_PE_pcrel + DW_EH_PE_sdata4. */ \
.byte 0x1b;
# define AUGMENTATION_PARAM_FDE \
/* No augmentation data. */ \
.uleb128 0;
# define START_SYMBOL_REF(name) \
/* PC-relative start address of the code. */ \
.long L(name##START)-.
# else
/* No augmentation. */
# define AUGMENTATION_STRING .ascii "\0"
# define AUGMENTATION_PARAM /* nothing */
# define AUGMENTATION_PARAM_FDE /* nothing */
# define START_SYMBOL_REF(name) \
/* Absolute start address of the code. */ \
.long L(name##START)
# endif
/* Callframe description for syscalls without parameters. This is very
simple. The only place the stack pointer is changed is when the old
cancellation state value is saved. */
# define EH_FRAME_0(name) \
.byte 0x40+L(PUSHSTATE)-L(name##START); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x40+L(POPSTATE)-L(PUSHSTATE); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4
/* For syscalls with one and two parameters the code is the same as for
those which take no parameter. */
# define EH_FRAME_1(name) \
.byte 0x40+L(SAVEBX1)-L(name##START); /* DW_CFA_advance_loc+N */ \
.byte 9; /* DW_CFA_register */ \
.uleb128 3; /* %ebx */ \
.uleb128 2; /* %edx */ \
.byte 0x40+L(RESTBX1)-L(SAVEBX1); /* DW_CFA_advance_loc+N */ \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(PUSHSTATE)-L(RESTBX1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x40+L(SAVEBX2)-L(PUSHSTATE); /* DW_CFA_advance_loc+N */ \
.byte 9; /* DW_CFA_register */ \
.uleb128 3; /* %ebx */ \
.uleb128 2; /* %edx */ \
.byte 0x40+L(RESTBX2)-L(SAVEBX2); /* DW_CFA_advance_loc+N */ \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(POPSTATE)-L(RESTBX2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4
# define EH_FRAME_2(name) EH_FRAME_1 (name)
/* For syscalls with three parameters the stack pointer is changed
also to save the content of the %ebx register. */
# define EH_FRAME_3(name) \
.byte 0x40+L(PUSHBX1)-L(name##START); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x83; /* DW_CFA_offset %ebx */ \
.uleb128 2; \
.byte 0x40+L(POPBX1)-L(PUSHBX1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4; \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(PUSHSTATE)-L(POPBX1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x40+L(PUSHBX2)-L(PUSHSTATE); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0x83; /* DW_CFA_offset %ebx */ \
.uleb128 3; \
.byte 0x40+L(POPBX2)-L(PUSHBX2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(POPSTATE)-L(POPBX2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4
/* With four parameters the syscall wrappers have to save %ebx and %esi. */
# define EH_FRAME_4(name) \
.byte 0x40+L(PUSHSI1)-L(name##START); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x86; /* DW_CFA_offset %esi */ \
.uleb128 2; \
.byte 0x40+L(PUSHBX1)-L(PUSHSI1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0x83; /* DW_CFA_offset %ebx */ \
.uleb128 3; \
.byte 0x40+L(POPBX1)-L(PUSHBX1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(POPSI1)-L(POPBX1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4; \
.byte 0xc6; /* DW_CFA_restore %esi */ \
.byte 0x40+L(PUSHSTATE)-L(POPSI1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x40+L(PUSHSI2)-L(PUSHSTATE); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0x86; /* DW_CFA_offset %esi */ \
.uleb128 3; \
.byte 0x40+L(PUSHBX2)-L(PUSHSI2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 16; \
.byte 0x83; /* DW_CFA_offset %ebx */ \
.uleb128 4; \
.byte 0x40+L(POPBX2)-L(PUSHBX2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(POPSI2)-L(POPBX2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0xc6; /* DW_CFA_restore %esi */ \
.byte 0x40+L(POPSTATE)-L(POPSI2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4
/* With five parameters the syscall wrappers have to save %ebx, %esi,
and %edi. */
# define EH_FRAME_5(name) \
.byte 0x40+L(PUSHDI1)-L(name##START); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x87; /* DW_CFA_offset %edi */ \
.uleb128 2; \
.byte 0x40+L(PUSHSI1)-L(PUSHDI1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0x86; /* DW_CFA_offset %esi */ \
.uleb128 3; \
.byte 0x40+L(PUSHBX1)-L(PUSHSI1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 16; \
.byte 0x83; /* DW_CFA_offset %ebx */ \
.uleb128 4; \
.byte 0x40+L(POPBX1)-L(PUSHBX1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(POPSI1)-L(POPBX1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0xc6; /* DW_CFA_restore %esi */ \
.byte 0x40+L(POPDI1)-L(POPSI1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4; \
.byte 0xc7; /* DW_CFA_restore %edi */ \
.byte 0x40+L(PUSHSTATE)-L(POPDI1); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0x40+L(PUSHDI2)-L(PUSHSTATE); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0x87; /* DW_CFA_offset %edi */ \
.uleb128 3; \
.byte 0x40+L(PUSHSI2)-L(PUSHDI2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 16; \
.byte 0x86; /* DW_CFA_offset %esi */ \
.uleb128 4; \
.byte 0x40+L(PUSHBX2)-L(PUSHSI2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 20; \
.byte 0x83; /* DW_CFA_offset %ebx */ \
.uleb128 5; \
.byte 0x40+L(POPBX2)-L(PUSHBX2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 16; \
.byte 0xc3; /* DW_CFA_restore %ebx */ \
.byte 0x40+L(POPSI2)-L(POPBX2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 12; \
.byte 0xc6; /* DW_CFA_restore %esi */ \
.byte 0x40+L(POPDI2)-L(POPSI2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 8; \
.byte 0xc7; /* DW_CFA_restore %edi */ \
.byte 0x40+L(POPSTATE)-L(POPDI2); /* DW_CFA_advance_loc+N */ \
.byte 14; /* DW_CFA_def_cfa_offset */ \
.uleb128 4
# undef ASM_SIZE_DIRECTIVE
# define ASM_SIZE_DIRECTIVE(name) L(name##END): .size name,.-name;
# define SAVE_OLDTYPE_0 movl %eax, %ecx;
# define SAVE_OLDTYPE_1 SAVE_OLDTYPE_0
# define SAVE_OLDTYPE_2 pushl %eax; L(PUSHSTATE):
# define SAVE_OLDTYPE_3 SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_4 SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_5 SAVE_OLDTYPE_2
# define PUSHCARGS_0 /* No arguments to push. */
# define DOCARGS_0 /* No arguments to frob. */
# define POPCARGS_0 /* No arguments to pop. */
# define _PUSHCARGS_0 /* No arguments to push. */
# define _POPCARGS_0 /* No arguments to pop. */
# define PUSHCARGS_1 movl %ebx, %edx; L(SAVEBX2): PUSHCARGS_0
# define DOCARGS_1 _DOARGS_1 (4)
# define POPCARGS_1 POPCARGS_0; movl %edx, %ebx; L(RESTBX2):
# define _PUSHCARGS_1 pushl %ebx; L(PUSHBX2): _PUSHCARGS_0
# define _POPCARGS_1 _POPCARGS_0; popl %ebx; L(POPBX2):
# define PUSHCARGS_2 PUSHCARGS_1
# define DOCARGS_2 _DOARGS_2 (12)
# define POPCARGS_2 POPCARGS_1
# define _PUSHCARGS_2 _PUSHCARGS_1
# define _POPCARGS_2 _POPCARGS_1
# define PUSHCARGS_3 _PUSHCARGS_2
# define DOCARGS_3 _DOARGS_3 (20)
# define POPCARGS_3 _POPCARGS_3
# define _PUSHCARGS_3 _PUSHCARGS_2
# define _POPCARGS_3 _POPCARGS_2
# define PUSHCARGS_4 _PUSHCARGS_4
# define DOCARGS_4 _DOARGS_4 (28)
# define POPCARGS_4 _POPCARGS_4
# define _PUSHCARGS_4 pushl %esi; L(PUSHSI2): _PUSHCARGS_3
# define _POPCARGS_4 _POPCARGS_3; popl %esi; L(POPSI2):
# define PUSHCARGS_5 _PUSHCARGS_5
# define DOCARGS_5 _DOARGS_5 (36)
# define POPCARGS_5 _POPCARGS_5
# define _PUSHCARGS_5 pushl %edi; L(PUSHDI2): _PUSHCARGS_4
# define _POPCARGS_5 _POPCARGS_4; popl %edi; L(POPDI2):
# ifdef IS_IN_libpthread
# define CENABLE call __pthread_enable_asynccancel;
# define CDISABLE call __pthread_disable_asynccancel
# elif !defined NOT_IN_libc
# define CENABLE call __libc_enable_asynccancel;
# define CDISABLE call __libc_disable_asynccancel
# elif defined IS_IN_librt
# define CENABLE call __librt_enable_asynccancel;
# define CDISABLE call __librt_disable_asynccancel
# else
# error Unsupported library
# endif
# define POPSTATE_0 \
pushl %eax; L(PUSHSTATE): movl %ecx, %eax; CDISABLE; popl %eax; L(POPSTATE):
# define POPSTATE_1 POPSTATE_0
# define POPSTATE_2 xchgl (%esp), %eax; CDISABLE; popl %eax; L(POPSTATE):
# define POPSTATE_3 POPSTATE_2
# define POPSTATE_4 POPSTATE_3
# define POPSTATE_5 POPSTATE_4
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
# else
# define SINGLE_THREAD_P cmpl $0, %gs:MULTIPLE_THREADS_OFFSET
# endif
#elif !defined __ASSEMBLER__
# define SINGLE_THREAD_P (1)
# define NO_CANCELLATION 1
#endif
|
