mirror of
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25f1e16ef0
CET is only support for x86_64, this patch reverts: -faaee1f07ex86: Support shadow stack pointer in setjmp/longjmp. -be9ccd27c0i386: Add _CET_ENDBR to indirect jump targets in add_n.S/sub_n.S -c02695d776x86/CET: Update vfork to prevent child return -5d844e1b72i386: Enable CET support in ucontext functions -124bcde683x86: Add _CET_ENDBR to functions in crti.S -562837c002x86: Add _CET_ENDBR to functions in dl-tlsdesc.S -f753fa7deax86: Support IBT and SHSTK in Intel CET [BZ #21598] -825b58f3fbi386-mcount.S: Add _CET_ENDBR to _mcount and __fentry__ -7e119cd582i386: Use _CET_NOTRACK in i686/memcmp.S -177824e232i386: Use _CET_NOTRACK in memcmp-sse4.S -0a899af097i386: Use _CET_NOTRACK in memcpy-ssse3-rep.S -7fb613361ci386: Use _CET_NOTRACK in memcpy-ssse3.S -77a8ae0948i386: Use _CET_NOTRACK in memset-sse2-rep.S -00e7b76a8fi386: Use _CET_NOTRACK in memset-sse2.S -90d15dc577i386: Use _CET_NOTRACK in strcat-sse2.S -f1574581c7i386: Use _CET_NOTRACK in strcpy-sse2.S -4031d7484ai386/sub_n.S: Add a missing _CET_ENDBR to indirect jump - target - Checked on i686-linux-gnu.
450 lines
15 KiB
C
450 lines
15 KiB
C
/* Copyright (C) 1992-2024 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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<https://www.gnu.org/licenses/>. */
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#ifndef _LINUX_I386_SYSDEP_H
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#define _LINUX_I386_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/i386/sysdep.h>
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/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */
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#include <dl-sysdep.h>
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#include <tls.h>
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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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#ifndef I386_USE_SYSENTER
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# if defined USE_DL_SYSINFO \
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&& (IS_IN (libc) || IS_IN (libpthread))
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# define I386_USE_SYSENTER 1
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# else
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# define I386_USE_SYSENTER 0
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# endif
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#endif
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#if !I386_USE_SYSENTER && IS_IN (libc) && !defined SHARED
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/* Inside static libc, we have two versions. For compilation units
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with !I386_USE_SYSENTER, the vDSO entry mechanism cannot be
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used. */
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# define I386_DO_SYSCALL_STRING "__libc_do_syscall_int80"
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#else
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# define I386_DO_SYSCALL_STRING "__libc_do_syscall"
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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 safely
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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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#undef SYSCALL_ERROR_LABEL
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#define SYSCALL_ERROR_LABEL __syscall_error
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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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cmpl $-4095, %eax; \
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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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/* The function has to return the error code. */
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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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negl %eax
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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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#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.c is used. */
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/* The original calling convention for system calls on Linux/i386 is
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to use int $0x80. */
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#if I386_USE_SYSENTER
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# ifdef PIC
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# define ENTER_KERNEL call *%gs:SYSINFO_OFFSET
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# else
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# define ENTER_KERNEL call *_dl_sysinfo
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# endif
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#else
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# define ENTER_KERNEL int $0x80
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#endif
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/* Linux takes system call arguments in registers:
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syscall number %eax call-clobbered
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arg 1 %ebx call-saved
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arg 2 %ecx call-clobbered
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arg 3 %edx call-clobbered
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arg 4 %esi call-saved
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arg 5 %edi call-saved
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arg 6 %ebp call-saved
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The stack layout upon entering the function is:
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24(%esp) Arg# 6
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20(%esp) Arg# 5
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16(%esp) Arg# 4
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12(%esp) Arg# 3
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8(%esp) Arg# 2
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4(%esp) Arg# 1
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(%esp) Return address
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(Of course a function with say 3 arguments does not have entries for
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arguments 4, 5, and 6.)
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The following code tries hard to be optimal. A general assumption
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(which is true according to the data books I have) is that
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2 * xchg is more expensive than pushl + movl + popl
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Beside this a neat trick is used. The calling conventions for Linux
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tell that among the registers used for parameters %ecx and %edx need
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not be saved. Beside this we may clobber this registers even when
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they are not used for parameter passing.
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As a result one can see below that we save the content of the %ebx
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register in the %edx register when we have less than 3 arguments
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(2 * movl is less expensive than pushl + popl).
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Second unlike for the other registers we don't save the content of
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%ecx and %edx when we have more than 1 and 2 registers resp.
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The code below might look a bit long but we have to take care for
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the pipelined processors (i586). Here the `pushl' and `popl'
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instructions are marked as NP (not pairable) but the exception is
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two consecutive of these instruction. This gives no penalty on
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other processors though. */
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#undef DO_CALL
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#define DO_CALL(syscall_name, args) \
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PUSHARGS_##args \
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DOARGS_##args \
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movl $SYS_ify (syscall_name), %eax; \
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ENTER_KERNEL \
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POPARGS_##args
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#define PUSHARGS_0 /* No arguments to push. */
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#define DOARGS_0 /* No arguments to frob. */
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#define POPARGS_0 /* No arguments to pop. */
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#define _PUSHARGS_0 /* No arguments to push. */
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#define _DOARGS_0(n) /* No arguments to frob. */
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#define _POPARGS_0 /* No arguments to pop. */
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#define PUSHARGS_1 movl %ebx, %edx; L(SAVEBX1): PUSHARGS_0
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#define DOARGS_1 _DOARGS_1 (4)
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#define POPARGS_1 POPARGS_0; movl %edx, %ebx; L(RESTBX1):
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#define _PUSHARGS_1 pushl %ebx; cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (ebx, 0); L(PUSHBX1): _PUSHARGS_0
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#define _DOARGS_1(n) movl n(%esp), %ebx; _DOARGS_0(n-4)
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#define _POPARGS_1 _POPARGS_0; popl %ebx; cfi_adjust_cfa_offset (-4); \
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cfi_restore (ebx); L(POPBX1):
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#define PUSHARGS_2 PUSHARGS_1
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#define DOARGS_2 _DOARGS_2 (8)
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#define POPARGS_2 POPARGS_1
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#define _PUSHARGS_2 _PUSHARGS_1
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#define _DOARGS_2(n) movl n(%esp), %ecx; _DOARGS_1 (n-4)
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#define _POPARGS_2 _POPARGS_1
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#define PUSHARGS_3 _PUSHARGS_2
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#define DOARGS_3 _DOARGS_3 (16)
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#define POPARGS_3 _POPARGS_3
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#define _PUSHARGS_3 _PUSHARGS_2
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#define _DOARGS_3(n) movl n(%esp), %edx; _DOARGS_2 (n-4)
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#define _POPARGS_3 _POPARGS_2
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#define PUSHARGS_4 _PUSHARGS_4
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#define DOARGS_4 _DOARGS_4 (24)
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#define POPARGS_4 _POPARGS_4
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#define _PUSHARGS_4 pushl %esi; cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (esi, 0); L(PUSHSI1): _PUSHARGS_3
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#define _DOARGS_4(n) movl n(%esp), %esi; _DOARGS_3 (n-4)
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#define _POPARGS_4 _POPARGS_3; popl %esi; cfi_adjust_cfa_offset (-4); \
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cfi_restore (esi); L(POPSI1):
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#define PUSHARGS_5 _PUSHARGS_5
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#define DOARGS_5 _DOARGS_5 (32)
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#define POPARGS_5 _POPARGS_5
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#define _PUSHARGS_5 pushl %edi; cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (edi, 0); L(PUSHDI1): _PUSHARGS_4
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#define _DOARGS_5(n) movl n(%esp), %edi; _DOARGS_4 (n-4)
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#define _POPARGS_5 _POPARGS_4; popl %edi; cfi_adjust_cfa_offset (-4); \
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cfi_restore (edi); L(POPDI1):
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#define PUSHARGS_6 _PUSHARGS_6
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#define DOARGS_6 _DOARGS_6 (40)
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#define POPARGS_6 _POPARGS_6
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#define _PUSHARGS_6 pushl %ebp; cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (ebp, 0); L(PUSHBP1): _PUSHARGS_5
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#define _DOARGS_6(n) movl n(%esp), %ebp; _DOARGS_5 (n-4)
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#define _POPARGS_6 _POPARGS_5; popl %ebp; cfi_adjust_cfa_offset (-4); \
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cfi_restore (ebp); L(POPBP1):
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#else /* !__ASSEMBLER__ */
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extern int __syscall_error (int)
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attribute_hidden __attribute__ ((__regparm__ (1)));
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/* Six-argument syscalls use an out-of-line helper, because an inline
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asm using all registers apart from %esp cannot work reliably and
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the assembler does not support describing an asm that saves and
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restores %ebp itself as a separate stack frame. This structure
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stores the arguments not passed in registers; %edi is passed with a
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pointer to this structure. */
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struct libc_do_syscall_args
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{
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int ebx, edi, ebp;
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};
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# define VDSO_NAME "LINUX_2.6"
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# define VDSO_HASH 61765110
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/* List of system calls which are supported as vsyscalls. */
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# define HAVE_CLOCK_GETTIME_VSYSCALL "__vdso_clock_gettime"
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# define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime64"
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# define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
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# define HAVE_TIME_VSYSCALL "__vdso_time"
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# define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres"
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# define HAVE_CLONE3_WRAPPER 1
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# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
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# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
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/* Define a macro which expands inline into the wrapper code for a system
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call. This use is for internal calls that do not need to handle errors
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normally. It will never touch errno. This returns just what the kernel
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gave back.
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The _NCS variant allows non-constant syscall numbers but it is not
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possible to use more than four parameters. */
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL_MAIN_0(name, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, 0, args)
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#define INTERNAL_SYSCALL_MAIN_1(name, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, 1, args)
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#define INTERNAL_SYSCALL_MAIN_2(name, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, 2, args)
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#define INTERNAL_SYSCALL_MAIN_3(name, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, 3, args)
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#define INTERNAL_SYSCALL_MAIN_4(name, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, 4, args)
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#define INTERNAL_SYSCALL_MAIN_5(name, args...) \
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INTERNAL_SYSCALL_MAIN_INLINE(name, 5, args)
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#define INTERNAL_SYSCALL_MAIN_NCS_0(name, args...) \
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INTERNAL_SYSCALL_MAIN_NCS(name, 0, args)
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#define INTERNAL_SYSCALL_MAIN_NCS_1(name, args...) \
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INTERNAL_SYSCALL_MAIN_NCS(name, 1, args)
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#define INTERNAL_SYSCALL_MAIN_NCS_2(name, args...) \
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INTERNAL_SYSCALL_MAIN_NCS(name, 2, args)
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#define INTERNAL_SYSCALL_MAIN_NCS_3(name, args...) \
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INTERNAL_SYSCALL_MAIN_NCS(name, 3, args)
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#define INTERNAL_SYSCALL_MAIN_NCS_4(name, args...) \
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INTERNAL_SYSCALL_MAIN_NCS(name, 4, args)
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#define INTERNAL_SYSCALL_MAIN_NCS_5(name, args...) \
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INTERNAL_SYSCALL_MAIN_NCS(name, 5, args)
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/* Each object using 6-argument inline syscalls must include a
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definition of __libc_do_syscall. */
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#define INTERNAL_SYSCALL_MAIN_6(name, arg1, arg2, arg3, \
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arg4, arg5, arg6) \
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struct libc_do_syscall_args _xv = \
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{ \
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(int) (arg1), \
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(int) (arg5), \
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(int) (arg6) \
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}; \
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asm volatile ( \
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"movl %1, %%eax\n\t" \
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"call " I386_DO_SYSCALL_STRING \
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: "=a" (resultvar) \
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: "i" (__NR_##name), "c" (arg2), "d" (arg3), "S" (arg4), "D" (&_xv) \
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: "memory", "cc")
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#define INTERNAL_SYSCALL_MAIN_NCS_6(name, arg1, arg2, arg3, \
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arg4, arg5, arg6) \
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struct libc_do_syscall_args _xv = \
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{ \
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(int) (arg1), \
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(int) (arg5), \
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(int) (arg6) \
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}; \
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asm volatile ( \
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"movl %1, %%eax\n\t" \
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"call " I386_DO_SYSCALL_STRING \
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: "=a" (resultvar) \
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: "a" (name), "c" (arg2), "d" (arg3), "S" (arg4), "D" (&_xv) \
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: "memory", "cc")
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#define INTERNAL_SYSCALL(name, nr, args...) \
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({ \
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register unsigned int resultvar; \
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INTERNAL_SYSCALL_MAIN_##nr (name, args); \
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(int) resultvar; })
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#define INTERNAL_SYSCALL_NCS(name, nr, args...) \
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({ \
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register unsigned int resultvar; \
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INTERNAL_SYSCALL_MAIN_NCS_##nr (name, args); \
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(int) resultvar; })
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#if I386_USE_SYSENTER
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# ifdef PIC
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# define INTERNAL_SYSCALL_MAIN_INLINE(name, nr, args...) \
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LOADREGS_##nr(args) \
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asm volatile ( \
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"call *%%gs:%P2" \
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: "=a" (resultvar) \
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: "a" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo)) \
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ASMARGS_##nr(args) : "memory", "cc")
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# define INTERNAL_SYSCALL_MAIN_NCS(name, nr, args...) \
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LOADREGS_##nr(args) \
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asm volatile ( \
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"call *%%gs:%P2" \
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: "=a" (resultvar) \
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: "a" (name), "i" (offsetof (tcbhead_t, sysinfo)) \
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ASMARGS_##nr(args) : "memory", "cc")
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# else /* I386_USE_SYSENTER && !PIC */
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# define INTERNAL_SYSCALL_MAIN_INLINE(name, nr, args...) \
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LOADREGS_##nr(args) \
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asm volatile ( \
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"call *_dl_sysinfo" \
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: "=a" (resultvar) \
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: "a" (__NR_##name) ASMARGS_##nr(args) : "memory", "cc")
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# define INTERNAL_SYSCALL_MAIN_NCS(name, nr, args...) \
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LOADREGS_##nr(args) \
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asm volatile ( \
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"call *_dl_sysinfo" \
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: "=a" (resultvar) \
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: "a" (name) ASMARGS_##nr(args) : "memory", "cc")
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# endif /* I386_USE_SYSENTER && !PIC */
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#else /* !I386_USE_SYSENTER */
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# define INTERNAL_SYSCALL_MAIN_INLINE(name, nr, args...) \
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LOADREGS_##nr(args) \
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asm volatile ( \
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"int $0x80" \
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: "=a" (resultvar) \
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: "a" (__NR_##name) ASMARGS_##nr(args) : "memory", "cc")
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# define INTERNAL_SYSCALL_MAIN_NCS(name, nr, args...) \
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LOADREGS_##nr(args) \
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asm volatile ( \
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"int $0x80" \
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: "=a" (resultvar) \
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: "a" (name) ASMARGS_##nr(args) : "memory", "cc")
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#endif /* !I386_USE_SYSENTER */
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#define LOADREGS_0()
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#define ASMARGS_0()
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#define LOADREGS_1(arg1) \
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LOADREGS_0 ()
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#define ASMARGS_1(arg1) \
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ASMARGS_0 (), "b" ((unsigned int) (arg1))
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#define LOADREGS_2(arg1, arg2) \
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LOADREGS_1 (arg1)
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#define ASMARGS_2(arg1, arg2) \
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ASMARGS_1 (arg1), "c" ((unsigned int) (arg2))
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#define LOADREGS_3(arg1, arg2, arg3) \
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LOADREGS_2 (arg1, arg2)
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#define ASMARGS_3(arg1, arg2, arg3) \
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ASMARGS_2 (arg1, arg2), "d" ((unsigned int) (arg3))
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#define LOADREGS_4(arg1, arg2, arg3, arg4) \
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LOADREGS_3 (arg1, arg2, arg3)
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#define ASMARGS_4(arg1, arg2, arg3, arg4) \
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ASMARGS_3 (arg1, arg2, arg3), "S" ((unsigned int) (arg4))
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#define LOADREGS_5(arg1, arg2, arg3, arg4, arg5) \
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LOADREGS_4 (arg1, arg2, arg3, arg4)
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#define ASMARGS_5(arg1, arg2, arg3, arg4, arg5) \
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ASMARGS_4 (arg1, arg2, arg3, arg4), "D" ((unsigned int) (arg5))
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#define ASMFMT_0()
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#ifdef __PIC__
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# define ASMFMT_1(arg1) \
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, "cd" (arg1)
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# define ASMFMT_2(arg1, arg2) \
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, "d" (arg1), "c" (arg2)
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# define ASMFMT_3(arg1, arg2, arg3) \
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, "D" (arg1), "c" (arg2), "d" (arg3)
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# define ASMFMT_4(arg1, arg2, arg3, arg4) \
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, "D" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)
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# define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \
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, "0" (arg1), "m" (_xv), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
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#else
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# define ASMFMT_1(arg1) \
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, "b" (arg1)
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# define ASMFMT_2(arg1, arg2) \
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, "b" (arg1), "c" (arg2)
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# define ASMFMT_3(arg1, arg2, arg3) \
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, "b" (arg1), "c" (arg2), "d" (arg3)
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# define ASMFMT_4(arg1, arg2, arg3, arg4) \
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, "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4)
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# define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \
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, "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
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#endif
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#define EXTRAVAR_0
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#define EXTRAVAR_1
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#define EXTRAVAR_2
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#define EXTRAVAR_3
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#define EXTRAVAR_4
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#ifdef __PIC__
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# define EXTRAVAR_5 int _xv;
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#else
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# define EXTRAVAR_5
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#endif
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#endif /* __ASSEMBLER__ */
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#endif /* linux/i386/sysdep.h */
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