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https://github.com/torvalds/linux
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dd5f726076
This patch adds support for loading a kexec on panic (kdump) kernel usning new system call. It prepares ELF headers for memory areas to be dumped and for saved cpu registers. Also prepares the memory map for second kernel and limits its boot to reserved areas only. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Greg Kroah-Hartman <greg@kroah.com> Cc: Dave Young <dyoung@redhat.com> Cc: WANG Chao <chaowang@redhat.com> Cc: Baoquan He <bhe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
101 lines
1.9 KiB
ArmAsm
101 lines
1.9 KiB
ArmAsm
/*
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* Copyright (C) 2003,2004 Eric Biederman (ebiederm@xmission.com)
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* Copyright (C) 2014 Red Hat Inc.
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* Author(s): Vivek Goyal <vgoyal@redhat.com>
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*
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* This code has been taken from kexec-tools.
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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.text
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.balign 16
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.code64
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.globl entry64, entry64_regs
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entry64:
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/* Setup a gdt that should be preserved */
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lgdt gdt(%rip)
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/* load the data segments */
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movl $0x18, %eax /* data segment */
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movl %eax, %ds
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movl %eax, %es
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movl %eax, %ss
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movl %eax, %fs
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movl %eax, %gs
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/* Setup new stack */
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leaq stack_init(%rip), %rsp
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pushq $0x10 /* CS */
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leaq new_cs_exit(%rip), %rax
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pushq %rax
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lretq
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new_cs_exit:
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/* Load the registers */
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movq rax(%rip), %rax
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movq rbx(%rip), %rbx
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movq rcx(%rip), %rcx
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movq rdx(%rip), %rdx
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movq rsi(%rip), %rsi
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movq rdi(%rip), %rdi
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movq rsp(%rip), %rsp
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movq rbp(%rip), %rbp
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movq r8(%rip), %r8
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movq r9(%rip), %r9
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movq r10(%rip), %r10
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movq r11(%rip), %r11
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movq r12(%rip), %r12
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movq r13(%rip), %r13
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movq r14(%rip), %r14
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movq r15(%rip), %r15
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/* Jump to the new code... */
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jmpq *rip(%rip)
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.section ".rodata"
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.balign 4
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entry64_regs:
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rax: .quad 0x0
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rcx: .quad 0x0
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rdx: .quad 0x0
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rbx: .quad 0x0
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rsp: .quad 0x0
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rbp: .quad 0x0
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rsi: .quad 0x0
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rdi: .quad 0x0
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r8: .quad 0x0
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r9: .quad 0x0
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r10: .quad 0x0
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r11: .quad 0x0
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r12: .quad 0x0
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r13: .quad 0x0
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r14: .quad 0x0
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r15: .quad 0x0
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rip: .quad 0x0
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.size entry64_regs, . - entry64_regs
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/* GDT */
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.section ".rodata"
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.balign 16
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gdt:
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/* 0x00 unusable segment
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* 0x08 unused
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* so use them as gdt ptr
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*/
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.word gdt_end - gdt - 1
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.quad gdt
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.word 0, 0, 0
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/* 0x10 4GB flat code segment */
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.word 0xFFFF, 0x0000, 0x9A00, 0x00AF
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/* 0x18 4GB flat data segment */
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.word 0xFFFF, 0x0000, 0x9200, 0x00CF
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gdt_end:
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stack: .quad 0, 0
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stack_init:
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