mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 23:35:26 +07:00
ab45fb1450
There are multiple factors adding to the issue in different
configurations:
- commit 17290231df ("xtensa: add fixup for double exception raised
in window overflow") added function window_overflow_restore_a0_fixup to
double exception vector overlapping reset vector location of secondary
processor cores.
- on MMUv2 cores RESET_VECTOR1_VADDR may point to uncached kernel memory
making code overlapping depend on cache type and size, so that without
cache or with WT cache reset vector code overwrites double exception
code, making issue even harder to detect.
- on MMUv3 cores RESET_VECTOR1_VADDR may point to unmapped area, as
MMUv3 cores change virtual address map to match MMUv2 layout, but
reset vector virtual address is given for the original MMUv3 mapping.
- physical memory region of the secondary reset vector is not reserved
in the physical memory map, and thus may be allocated and overwritten
at arbitrary moment.
Fix it as follows:
- move window_overflow_restore_a0_fixup code to .text section.
- define RESET_VECTOR1_VADDR so that it points to reset vector in the
cacheable MMUv2 map for cores with MMU.
- reserve reset vector region in the physical memory map. Drop separate
literal section and build mxhead.S with text section literals.
Cc: <stable@vger.kernel.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
363 lines
9.3 KiB
ArmAsm
363 lines
9.3 KiB
ArmAsm
/*
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* arch/xtensa/kernel/vmlinux.lds.S
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*
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* Xtensa linker script
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2008 Tensilica Inc.
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*
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* Chris Zankel <chris@zankel.net>
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* Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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*/
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/page.h>
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#include <asm/thread_info.h>
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#include <asm/vectors.h>
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#include <variant/core.h>
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#include <platform/hardware.h>
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OUTPUT_ARCH(xtensa)
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ENTRY(_start)
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#ifdef __XTENSA_EB__
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jiffies = jiffies_64 + 4;
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#else
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jiffies = jiffies_64;
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#endif
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#ifndef KERNELOFFSET
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#define KERNELOFFSET 0xd0003000
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#endif
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/* Note: In the following macros, it would be nice to specify only the
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vector name and section kind and construct "sym" and "section" using
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CPP concatenation, but that does not work reliably. Concatenating a
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string with "." produces an invalid token. CPP will not print a
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warning because it thinks this is an assembly file, but it leaves
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them as multiple tokens and there may or may not be whitespace
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between them. */
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/* Macro for a relocation entry */
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#define RELOCATE_ENTRY(sym, section) \
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LONG(sym ## _start); \
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LONG(sym ## _end); \
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LONG(LOADADDR(section))
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/* Macro to define a section for a vector.
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*
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* Use of the MIN function catches the types of errors illustrated in
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* the following example:
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*
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* Assume the section .DoubleExceptionVector.literal is completely
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* full. Then a programmer adds code to .DoubleExceptionVector.text
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* that produces another literal. The final literal position will
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* overlay onto the first word of the adjacent code section
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* .DoubleExceptionVector.text. (In practice, the literals will
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* overwrite the code, and the first few instructions will be
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* garbage.)
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*/
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#define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec) \
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section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size, \
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LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3) \
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{ \
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. = ALIGN(4); \
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sym ## _start = ABSOLUTE(.); \
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*(section) \
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sym ## _end = ABSOLUTE(.); \
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}
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/*
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* Mapping of input sections to output sections when linking.
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*/
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SECTIONS
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{
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. = KERNELOFFSET;
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/* .text section */
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_text = .;
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_stext = .;
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.text :
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{
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/* The HEAD_TEXT section must be the first section! */
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HEAD_TEXT
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TEXT_TEXT
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VMLINUX_SYMBOL(__sched_text_start) = .;
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*(.sched.literal .sched.text)
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VMLINUX_SYMBOL(__sched_text_end) = .;
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VMLINUX_SYMBOL(__lock_text_start) = .;
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*(.spinlock.literal .spinlock.text)
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VMLINUX_SYMBOL(__lock_text_end) = .;
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}
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_etext = .;
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PROVIDE (etext = .);
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. = ALIGN(16);
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RODATA
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/* Relocation table */
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.fixup : { *(.fixup) }
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EXCEPTION_TABLE(16)
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/* Data section */
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_sdata = .;
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RW_DATA_SECTION(XCHAL_ICACHE_LINESIZE, PAGE_SIZE, THREAD_SIZE)
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_edata = .;
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/* Initialization code and data: */
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. = ALIGN(PAGE_SIZE);
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__init_begin = .;
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INIT_TEXT_SECTION(PAGE_SIZE)
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.init.data :
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{
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INIT_DATA
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. = ALIGN(0x4);
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__tagtable_begin = .;
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*(.taglist)
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__tagtable_end = .;
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. = ALIGN(16);
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__boot_reloc_table_start = ABSOLUTE(.);
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RELOCATE_ENTRY(_WindowVectors_text,
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.WindowVectors.text);
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#if XCHAL_EXCM_LEVEL >= 2
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RELOCATE_ENTRY(_Level2InterruptVector_text,
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.Level2InterruptVector.text);
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#endif
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#if XCHAL_EXCM_LEVEL >= 3
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RELOCATE_ENTRY(_Level3InterruptVector_text,
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.Level3InterruptVector.text);
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#endif
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#if XCHAL_EXCM_LEVEL >= 4
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RELOCATE_ENTRY(_Level4InterruptVector_text,
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.Level4InterruptVector.text);
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#endif
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#if XCHAL_EXCM_LEVEL >= 5
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RELOCATE_ENTRY(_Level5InterruptVector_text,
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.Level5InterruptVector.text);
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#endif
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#if XCHAL_EXCM_LEVEL >= 6
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RELOCATE_ENTRY(_Level6InterruptVector_text,
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.Level6InterruptVector.text);
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#endif
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RELOCATE_ENTRY(_KernelExceptionVector_text,
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.KernelExceptionVector.text);
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RELOCATE_ENTRY(_UserExceptionVector_text,
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.UserExceptionVector.text);
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RELOCATE_ENTRY(_DoubleExceptionVector_literal,
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.DoubleExceptionVector.literal);
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RELOCATE_ENTRY(_DoubleExceptionVector_text,
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.DoubleExceptionVector.text);
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RELOCATE_ENTRY(_DebugInterruptVector_text,
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.DebugInterruptVector.text);
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#if defined(CONFIG_SMP)
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RELOCATE_ENTRY(_SecondaryResetVector_text,
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.SecondaryResetVector.text);
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#endif
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__boot_reloc_table_end = ABSOLUTE(.) ;
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INIT_SETUP(XCHAL_ICACHE_LINESIZE)
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INIT_CALLS
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CON_INITCALL
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SECURITY_INITCALL
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INIT_RAM_FS
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}
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PERCPU_SECTION(XCHAL_ICACHE_LINESIZE)
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/* We need this dummy segment here */
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. = ALIGN(4);
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.dummy : { LONG(0) }
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/* The vectors are relocated to the real position at startup time */
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SECTION_VECTOR (_WindowVectors_text,
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.WindowVectors.text,
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WINDOW_VECTORS_VADDR, 4,
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.dummy)
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SECTION_VECTOR (_DebugInterruptVector_literal,
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.DebugInterruptVector.literal,
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DEBUG_VECTOR_VADDR - 4,
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SIZEOF(.WindowVectors.text),
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.WindowVectors.text)
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SECTION_VECTOR (_DebugInterruptVector_text,
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.DebugInterruptVector.text,
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DEBUG_VECTOR_VADDR,
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4,
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.DebugInterruptVector.literal)
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#undef LAST
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#define LAST .DebugInterruptVector.text
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#if XCHAL_EXCM_LEVEL >= 2
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SECTION_VECTOR (_Level2InterruptVector_text,
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.Level2InterruptVector.text,
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INTLEVEL2_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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# undef LAST
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# define LAST .Level2InterruptVector.text
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#endif
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#if XCHAL_EXCM_LEVEL >= 3
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SECTION_VECTOR (_Level3InterruptVector_text,
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.Level3InterruptVector.text,
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INTLEVEL3_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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# undef LAST
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# define LAST .Level3InterruptVector.text
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#endif
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#if XCHAL_EXCM_LEVEL >= 4
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SECTION_VECTOR (_Level4InterruptVector_text,
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.Level4InterruptVector.text,
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INTLEVEL4_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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# undef LAST
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# define LAST .Level4InterruptVector.text
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#endif
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#if XCHAL_EXCM_LEVEL >= 5
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SECTION_VECTOR (_Level5InterruptVector_text,
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.Level5InterruptVector.text,
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INTLEVEL5_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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# undef LAST
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# define LAST .Level5InterruptVector.text
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#endif
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#if XCHAL_EXCM_LEVEL >= 6
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SECTION_VECTOR (_Level6InterruptVector_text,
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.Level6InterruptVector.text,
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INTLEVEL6_VECTOR_VADDR,
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SIZEOF(LAST), LAST)
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# undef LAST
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# define LAST .Level6InterruptVector.text
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#endif
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SECTION_VECTOR (_KernelExceptionVector_literal,
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.KernelExceptionVector.literal,
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KERNEL_VECTOR_VADDR - 4,
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SIZEOF(LAST), LAST)
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#undef LAST
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SECTION_VECTOR (_KernelExceptionVector_text,
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.KernelExceptionVector.text,
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KERNEL_VECTOR_VADDR,
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4,
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.KernelExceptionVector.literal)
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SECTION_VECTOR (_UserExceptionVector_literal,
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.UserExceptionVector.literal,
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USER_VECTOR_VADDR - 4,
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SIZEOF(.KernelExceptionVector.text),
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.KernelExceptionVector.text)
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SECTION_VECTOR (_UserExceptionVector_text,
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.UserExceptionVector.text,
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USER_VECTOR_VADDR,
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4,
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.UserExceptionVector.literal)
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SECTION_VECTOR (_DoubleExceptionVector_literal,
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.DoubleExceptionVector.literal,
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DOUBLEEXC_VECTOR_VADDR - 48,
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SIZEOF(.UserExceptionVector.text),
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.UserExceptionVector.text)
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SECTION_VECTOR (_DoubleExceptionVector_text,
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.DoubleExceptionVector.text,
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DOUBLEEXC_VECTOR_VADDR,
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48,
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.DoubleExceptionVector.literal)
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. = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
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#if defined(CONFIG_SMP)
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SECTION_VECTOR (_SecondaryResetVector_text,
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.SecondaryResetVector.text,
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RESET_VECTOR1_VADDR,
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SIZEOF(.DoubleExceptionVector.text),
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.DoubleExceptionVector.text)
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. = LOADADDR(.SecondaryResetVector.text)+SIZEOF(.SecondaryResetVector.text);
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#endif
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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BSS_SECTION(0, 8192, 0)
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_end = .;
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/* only used by the boot loader */
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. = ALIGN(0x10);
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.bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
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.ResetVector.text RESET_VECTOR_VADDR :
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{
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*(.ResetVector.text)
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}
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/*
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* This is a remapped copy of the Secondary Reset Vector Code.
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* It keeps gdb in sync with the PC after switching
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* to the temporary mapping used while setting up
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* the V2 MMU mappings for Linux.
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*
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* Only debug information about this section is put in the kernel image.
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*/
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.SecondaryResetVector.remapped_text 0x46000000 (INFO):
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{
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*(.SecondaryResetVector.remapped_text)
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}
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.xt.lit : { *(.xt.lit) }
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.xt.prop : { *(.xt.prop) }
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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.debug_info 0 : { *(.debug_info) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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.xt.insn 0 :
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{
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*(.xt.insn)
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*(.gnu.linkonce.x*)
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}
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.xt.lit 0 :
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{
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*(.xt.lit)
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*(.gnu.linkonce.p*)
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}
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/* Sections to be discarded */
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DISCARDS
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/DISCARD/ : { *(.exit.literal) }
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}
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