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17290231df
There are two FIXMEs in the double exception handler 'for the extremely
unlikely case'. This case gets hit by gcc during kernel build once in
a few hours, resulting in an unrecoverable exception condition.
Provide missing fixup routine to handle this case. Double exception
literals now need 8 more bytes, add them to the linker script.
Also replace bbsi instructions with bbsi.l as we're branching depending
on 8th and 7th LSB-based bits of exception address.
This may be tested by adding the explicit DTLB invalidation to window
overflow handlers, like the following:
--- a/arch/xtensa/kernel/vectors.S
+++ b/arch/xtensa/kernel/vectors.S
@@ -592,6 +592,14 @@ ENDPROC(_WindowUnderflow4)
ENTRY_ALIGN64(_WindowOverflow8)
s32e a0, a9, -16
+ bbsi.l a9, 31, 1f
+ rsr a0, ccount
+ bbsi.l a0, 4, 1f
+ pdtlb a0, a9
+ idtlb a0
+ movi a0, 9
+ idtlb a0
+1:
l32e a0, a1, -12
s32e a2, a9, -8
s32e a1, a9, -12
Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
371 lines
9.5 KiB
ArmAsm
371 lines
9.5 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_literal,
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.SecondaryResetVector.literal);
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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 - 40,
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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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40,
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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_literal,
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.SecondaryResetVector.literal,
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RESET_VECTOR1_VADDR - 4,
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SIZEOF(.DoubleExceptionVector.text),
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.DoubleExceptionVector.text)
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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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4,
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.SecondaryResetVector.literal)
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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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