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103 lines
1.9 KiB
103 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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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#include <linux/linkage.h> |
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.text |
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.balign 16 |
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.code64 |
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SYM_CODE_START(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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SYM_CODE_END(entry64) |
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.section ".rodata" |
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.balign 4 |
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SYM_DATA_START(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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SYM_DATA_END(entry64_regs) |
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/* GDT */ |
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.section ".rodata" |
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.balign 16 |
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SYM_DATA_START_LOCAL(gdt) |
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/* |
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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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SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end) |
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SYM_DATA_START_LOCAL(stack) |
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.quad 0, 0 |
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SYM_DATA_END_LABEL(stack, SYM_L_LOCAL, stack_init)
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