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linux_dsm_epyc7002/arch/arm64/include/asm/sections.h

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-03 12:44:50 +07:00
/* SPDX-License-Identifier: GPL-2.0-only */
arm64: Create sections.h Each time new section markers are added, kernel/vmlinux.ld.S is updated, and new extern char __start_foo[] definitions are scattered through the tree. Create asm/include/sections.h to collect these definitions (and include the existing asm-generic version). Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-08-25 00:27:28 +07:00
/*
* Copyright (C) 2016 ARM Limited
*/
#ifndef __ASM_SECTIONS_H
#define __ASM_SECTIONS_H
#include <asm-generic/sections.h>
extern char __alt_instructions[], __alt_instructions_end[];
extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
extern char __hyp_text_start[], __hyp_text_end[];
extern char __idmap_text_start[], __idmap_text_end[];
arm64: mmu: apply strict permissions to .init.text and .init.data To avoid having mappings that are writable and executable at the same time, split the init region into a .init.text region that is mapped read-only, and a .init.data region that is mapped non-executable. This is possible now that the alternative patching occurs via the linear mapping, and the linear alias of the init region is always mapped writable (but never executable). Since the alternatives descriptions themselves are read-only data, move those into the .init.text region. Reviewed-by: Laura Abbott <labbott@redhat.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-03-10 03:52:03 +07:00
extern char __initdata_begin[], __initdata_end[];
extern char __inittext_begin[], __inittext_end[];
arm64: insn: consistently handle exit text A kernel built with KASAN && FTRACE_WITH_REGS && !MODULES, produces a boot-time splat in the bowels of ftrace: | [ 0.000000] ftrace: allocating 32281 entries in 127 pages | [ 0.000000] ------------[ cut here ]------------ | [ 0.000000] WARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:2019 ftrace_bug+0x27c/0x328 | [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.0-rc3-00008-g7f08ae53a7e3 #13 | [ 0.000000] Hardware name: linux,dummy-virt (DT) | [ 0.000000] pstate: 60000085 (nZCv daIf -PAN -UAO) | [ 0.000000] pc : ftrace_bug+0x27c/0x328 | [ 0.000000] lr : ftrace_init+0x640/0x6cc | [ 0.000000] sp : ffffa000120e7e00 | [ 0.000000] x29: ffffa000120e7e00 x28: ffff00006ac01b10 | [ 0.000000] x27: ffff00006ac898c0 x26: dfffa00000000000 | [ 0.000000] x25: ffffa000120ef290 x24: ffffa0001216df40 | [ 0.000000] x23: 000000000000018d x22: ffffa0001244c700 | [ 0.000000] x21: ffffa00011bf393c x20: ffff00006ac898c0 | [ 0.000000] x19: 00000000ffffffff x18: 0000000000001584 | [ 0.000000] x17: 0000000000001540 x16: 0000000000000007 | [ 0.000000] x15: 0000000000000000 x14: ffffa00010432770 | [ 0.000000] x13: ffff940002483519 x12: 1ffff40002483518 | [ 0.000000] x11: 1ffff40002483518 x10: ffff940002483518 | [ 0.000000] x9 : dfffa00000000000 x8 : 0000000000000001 | [ 0.000000] x7 : ffff940002483519 x6 : ffffa0001241a8c0 | [ 0.000000] x5 : ffff940002483519 x4 : ffff940002483519 | [ 0.000000] x3 : ffffa00011780870 x2 : 0000000000000001 | [ 0.000000] x1 : 1fffe0000d591318 x0 : 0000000000000000 | [ 0.000000] Call trace: | [ 0.000000] ftrace_bug+0x27c/0x328 | [ 0.000000] ftrace_init+0x640/0x6cc | [ 0.000000] start_kernel+0x27c/0x654 | [ 0.000000] random: get_random_bytes called from print_oops_end_marker+0x30/0x60 with crng_init=0 | [ 0.000000] ---[ end trace 0000000000000000 ]--- | [ 0.000000] ftrace faulted on writing | [ 0.000000] [<ffffa00011bf393c>] _GLOBAL__sub_D_65535_0___tracepoint_initcall_level+0x4/0x28 | [ 0.000000] Initializing ftrace call sites | [ 0.000000] ftrace record flags: 0 | [ 0.000000] (0) | [ 0.000000] expected tramp: ffffa000100b3344 This is due to an unfortunate combination of several factors. Building with KASAN results in the compiler generating anonymous functions to register/unregister global variables against the shadow memory. These functions are placed in .text.startup/.text.exit, and given mangled names like _GLOBAL__sub_{I,D}_65535_0_$OTHER_SYMBOL. The kernel linker script places these in .init.text and .exit.text respectively, which are both discarded at runtime as part of initmem. Building with FTRACE_WITH_REGS uses -fpatchable-function-entry=2, which also instruments KASAN's anonymous functions. When these are discarded with the rest of initmem, ftrace removes dangling references to these call sites. Building without MODULES implicitly disables STRICT_MODULE_RWX, and causes arm64's patch_map() function to treat any !core_kernel_text() symbol as something that can be modified in-place. As core_kernel_text() is only true for .text and .init.text, with the latter depending on system_state < SYSTEM_RUNNING, we'll treat .exit.text as something that can be patched in-place. However, .exit.text is mapped read-only. Hence in this configuration the ftrace init code blows up while trying to patch one of the functions generated by KASAN. We could try to filter out the call sites in .exit.text rather than initializing them, but this would be inconsistent with how we handle .init.text, and requires hooking into core bits of ftrace. The behaviour of patch_map() is also inconsistent today, so instead let's clean that up and have it consistently handle .exit.text. This patch teaches patch_map() to handle .exit.text at init time, preventing the boot-time splat above. The flow of patch_map() is reworked to make the logic clearer and minimize redundant conditionality. Fixes: 3b23e4991fb66f6d ("arm64: implement ftrace with regs") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Amit Daniel Kachhap <amit.kachhap@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Torsten Duwe <duwe@suse.de> Cc: Will Deacon <will@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2019-12-02 23:11:07 +07:00
extern char __exittext_begin[], __exittext_end[];
arm64: Create sections.h Each time new section markers are added, kernel/vmlinux.ld.S is updated, and new extern char __start_foo[] definitions are scattered through the tree. Create asm/include/sections.h to collect these definitions (and include the existing asm-generic version). Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-08-25 00:27:28 +07:00
extern char __irqentry_text_start[], __irqentry_text_end[];
arm64: vmlinux.ld: Add mmuoff data sections and move mmuoff text into idmap Resume from hibernate needs to clean any text executed by the kernel with the MMU off to the PoC. Collect these functions together into the .idmap.text section as all this code is tightly coupled and also needs the same cleaning after resume. Data is more complicated, secondary_holding_pen_release is written with the MMU on, clean and invalidated, then read with the MMU off. In contrast __boot_cpu_mode is written with the MMU off, the corresponding cache line is invalidated, so when we read it with the MMU on we don't get stale data. These cache maintenance operations conflict with each other if the values are within a Cache Writeback Granule (CWG) of each other. Collect the data into two sections .mmuoff.data.read and .mmuoff.data.write, the linker script ensures mmuoff.data.write section is aligned to the architectural maximum CWG of 2KB. Signed-off-by: James Morse <james.morse@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-08-25 00:27:29 +07:00
extern char __mmuoff_data_start[], __mmuoff_data_end[];
arm64: mmu: add the entry trampolines start/end section markers into sections.h SDEI needs to calculate an offset in the trampoline page too. Move the extern char[] to sections.h. This patch just moves code around. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2018-01-08 22:38:17 +07:00
extern char __entry_tramp_text_start[], __entry_tramp_text_end[];
arm64: Create sections.h Each time new section markers are added, kernel/vmlinux.ld.S is updated, and new extern char __start_foo[] definitions are scattered through the tree. Create asm/include/sections.h to collect these definitions (and include the existing asm-generic version). Signed-off-by: James Morse <james.morse@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-08-25 00:27:28 +07:00
#endif /* __ASM_SECTIONS_H */
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