mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d19f5e41b3
Al Viro noticed that userspace accesses via get_user()/put_user() can be simplified a lot with regard to usage of the exception handling. This patch implements a fixup routine for get_user() and put_user() in such that the exception handler will automatically load -EFAULT into the register %r8 (the error value) in case on a fault on userspace. Additionally the fixup routine will zero the target register on fault in case of a get_user() call. The target register is extracted out of the faulting assembly instruction. This patch brings a few benefits over the old implementation: 1. Exception handling gets much cleaner, easier and smaller in size. 2. Helper functions like fixup_get_user_skip_1 (all of fixup.S) can be dropped. 3. No need to hardcode %r9 as target register for get_user() any longer. This helps the compiler register allocator and thus creates less assembler statements. 4. No dependency on the exception_data contents any longer. 5. Nested faults will be handled cleanly. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Cc: <stable@vger.kernel.org> # v4.9+ Signed-off-by: Helge Deller <deller@gmx.de>
155 lines
4.1 KiB
C
155 lines
4.1 KiB
C
/*
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* Architecture-specific kernel symbols
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*
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* Copyright (C) 2000-2001 Richard Hirst <rhirst with parisc-linux.org>
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* Copyright (C) 2001 Dave Kennedy
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* Copyright (C) 2001 Paul Bame <bame at parisc-linux.org>
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* Copyright (C) 2001-2003 Grant Grundler <grundler with parisc-linux.org>
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* Copyright (C) 2002-2003 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2002 Randolph Chung <tausq at parisc-linux.org>
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* Copyright (C) 2002-2007 Helge Deller <deller with parisc-linux.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/syscalls.h>
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#include <linux/string.h>
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EXPORT_SYMBOL(memset);
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#include <linux/atomic.h>
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EXPORT_SYMBOL(__xchg8);
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EXPORT_SYMBOL(__xchg32);
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EXPORT_SYMBOL(__cmpxchg_u32);
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#ifdef CONFIG_SMP
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EXPORT_SYMBOL(__atomic_hash);
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#endif
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#ifdef CONFIG_64BIT
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EXPORT_SYMBOL(__xchg64);
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EXPORT_SYMBOL(__cmpxchg_u64);
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#endif
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#include <linux/uaccess.h>
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EXPORT_SYMBOL(lclear_user);
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EXPORT_SYMBOL(lstrnlen_user);
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#ifndef CONFIG_64BIT
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/* Needed so insmod can set dp value */
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extern int $global$;
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EXPORT_SYMBOL($global$);
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#endif
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#include <asm/io.h>
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EXPORT_SYMBOL(memcpy_toio);
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EXPORT_SYMBOL(memcpy_fromio);
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EXPORT_SYMBOL(memset_io);
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extern void $$divI(void);
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extern void $$divU(void);
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extern void $$remI(void);
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extern void $$remU(void);
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extern void $$mulI(void);
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extern void $$divU_3(void);
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extern void $$divU_5(void);
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extern void $$divU_6(void);
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extern void $$divU_9(void);
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extern void $$divU_10(void);
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extern void $$divU_12(void);
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extern void $$divU_7(void);
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extern void $$divU_14(void);
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extern void $$divU_15(void);
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extern void $$divI_3(void);
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extern void $$divI_5(void);
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extern void $$divI_6(void);
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extern void $$divI_7(void);
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extern void $$divI_9(void);
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extern void $$divI_10(void);
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extern void $$divI_12(void);
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extern void $$divI_14(void);
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extern void $$divI_15(void);
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EXPORT_SYMBOL($$divI);
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EXPORT_SYMBOL($$divU);
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EXPORT_SYMBOL($$remI);
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EXPORT_SYMBOL($$remU);
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EXPORT_SYMBOL($$mulI);
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EXPORT_SYMBOL($$divU_3);
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EXPORT_SYMBOL($$divU_5);
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EXPORT_SYMBOL($$divU_6);
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EXPORT_SYMBOL($$divU_9);
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EXPORT_SYMBOL($$divU_10);
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EXPORT_SYMBOL($$divU_12);
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EXPORT_SYMBOL($$divU_7);
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EXPORT_SYMBOL($$divU_14);
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EXPORT_SYMBOL($$divU_15);
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EXPORT_SYMBOL($$divI_3);
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EXPORT_SYMBOL($$divI_5);
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EXPORT_SYMBOL($$divI_6);
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EXPORT_SYMBOL($$divI_7);
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EXPORT_SYMBOL($$divI_9);
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EXPORT_SYMBOL($$divI_10);
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EXPORT_SYMBOL($$divI_12);
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EXPORT_SYMBOL($$divI_14);
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EXPORT_SYMBOL($$divI_15);
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extern void __ashrdi3(void);
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extern void __ashldi3(void);
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extern void __lshrdi3(void);
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extern void __muldi3(void);
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extern void __ucmpdi2(void);
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EXPORT_SYMBOL(__ashrdi3);
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EXPORT_SYMBOL(__ashldi3);
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EXPORT_SYMBOL(__lshrdi3);
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EXPORT_SYMBOL(__muldi3);
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EXPORT_SYMBOL(__ucmpdi2);
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asmlinkage void * __canonicalize_funcptr_for_compare(void *);
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EXPORT_SYMBOL(__canonicalize_funcptr_for_compare);
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#ifdef CONFIG_64BIT
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extern void __divdi3(void);
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extern void __udivdi3(void);
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extern void __umoddi3(void);
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extern void __moddi3(void);
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EXPORT_SYMBOL(__divdi3);
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EXPORT_SYMBOL(__udivdi3);
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EXPORT_SYMBOL(__umoddi3);
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EXPORT_SYMBOL(__moddi3);
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#endif
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#ifndef CONFIG_64BIT
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extern void $$dyncall(void);
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EXPORT_SYMBOL($$dyncall);
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#endif
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#ifdef CONFIG_DISCONTIGMEM
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#include <asm/mmzone.h>
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EXPORT_SYMBOL(node_data);
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EXPORT_SYMBOL(pfnnid_map);
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#endif
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#ifdef CONFIG_FUNCTION_TRACER
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extern void _mcount(void);
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EXPORT_SYMBOL(_mcount);
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#endif
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/* from pacache.S -- needed for clear/copy_page */
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EXPORT_SYMBOL(clear_page_asm);
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EXPORT_SYMBOL(copy_page_asm);
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