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purgatory
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entry64.S

entry64.S 1.9 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2003,2004  Eric Biederman (ebiederm@xmission.com)
    3. 

  3.  * Copyright (C) 2014  Red Hat Inc.
    4. 

  4. 

  5.  * Author(s): Vivek Goyal <vgoyal@redhat.com>
    6. 

  6.  *
    7. 

  7.  * This code has been taken from kexec-tools.
    8. 

  8.  *
    9. 

  9.  * This source code is licensed under the GNU General Public License,
    10. 

  10.  * Version 2.  See the file COPYING for more details.
    11. 

  11.  */
    12. 

  12. 

  13. 	.text
    14. 

  14. 	.balign 16
    15. 

  15. 	.code64
    16. 

  16. 	.globl entry64, entry64_regs
    17. 

  17. 

  18. 

  19. entry64:
    20. 

  20. 	/* Setup a gdt that should be preserved */
    21. 

  21. 	lgdt gdt(%rip)
    22. 

  22. 

  23. 	/* load the data segments */
    24. 

  24. 	movl    $0x18, %eax     /* data segment */
    25. 

  25. 	movl    %eax, %ds
    26. 

  26. 	movl    %eax, %es
    27. 

  27. 	movl    %eax, %ss
    28. 

  28. 	movl    %eax, %fs
    29. 

  29. 	movl    %eax, %gs
    30. 

  30. 

  31. 	/* Setup new stack */
    32. 

  32. 	leaq    stack_init(%rip), %rsp
    33. 

  33. 	pushq   $0x10 /* CS */
    34. 

  34. 	leaq    new_cs_exit(%rip), %rax
    35. 

  35. 	pushq   %rax
    36. 

  36. 	lretq
    37. 

  37. new_cs_exit:
    38. 

  38. 

  39. 	/* Load the registers */
    40. 

  40. 	movq	rax(%rip), %rax
    41. 

  41. 	movq	rbx(%rip), %rbx
    42. 

  42. 	movq	rcx(%rip), %rcx
    43. 

  43. 	movq	rdx(%rip), %rdx
    44. 

  44. 	movq	rsi(%rip), %rsi
    45. 

  45. 	movq	rdi(%rip), %rdi
    46. 

  46. 	movq    rsp(%rip), %rsp
    47. 

  47. 	movq	rbp(%rip), %rbp
    48. 

  48. 	movq	r8(%rip), %r8
    49. 

  49. 	movq	r9(%rip), %r9
    50. 

  50. 	movq	r10(%rip), %r10
    51. 

  51. 	movq	r11(%rip), %r11
    52. 

  52. 	movq	r12(%rip), %r12
    53. 

  53. 	movq	r13(%rip), %r13
    54. 

  54. 	movq	r14(%rip), %r14
    55. 

  55. 	movq	r15(%rip), %r15
    56. 

  56. 

  57. 	/* Jump to the new code... */
    58. 

  58. 	jmpq	*rip(%rip)
    59. 

  59. 

  60. 	.section ".rodata"
    61. 

  61. 	.balign 4
    62. 

  62. entry64_regs:
    63. 

  63. rax:	.quad 0x0
    64. 

  64. rcx:	.quad 0x0
    65. 

  65. rdx:	.quad 0x0
    66. 

  66. rbx:	.quad 0x0
    67. 

  67. rsp:	.quad 0x0
    68. 

  68. rbp:	.quad 0x0
    69. 

  69. rsi:	.quad 0x0
    70. 

  70. rdi:	.quad 0x0
    71. 

  71. r8:	.quad 0x0
    72. 

  72. r9:	.quad 0x0
    73. 

  73. r10:	.quad 0x0
    74. 

  74. r11:	.quad 0x0
    75. 

  75. r12:	.quad 0x0
    76. 

  76. r13:	.quad 0x0
    77. 

  77. r14:	.quad 0x0
    78. 

  78. r15:	.quad 0x0
    79. 

  79. rip:	.quad 0x0
    80. 

  80. 	.size entry64_regs, . - entry64_regs
    81. 

  81. 

  82. 	/* GDT */
    83. 

  83. 	.section ".rodata"
    84. 

  84. 	.balign 16
    85. 

  85. gdt:
    86. 

  86. 	/* 0x00 unusable segment
    87. 

  87. 	 * 0x08 unused
    88. 

  88. 	 * so use them as gdt ptr
    89. 

  89. 	 */
    90. 

  90. 	.word gdt_end - gdt - 1
    91. 

  91. 	.quad gdt
    92. 

  92. 	.word 0, 0, 0
    93. 

  93. 

  94. 	/* 0x10 4GB flat code segment */
    95. 

  95. 	.word 0xFFFF, 0x0000, 0x9A00, 0x00AF
    96. 

  96. 

  97. 	/* 0x18 4GB flat data segment */
    98. 

  98. 	.word 0xFFFF, 0x0000, 0x9200, 0x00CF
    99. 

  99. gdt_end:
    100. 

  100. stack:	.quad   0, 0
    101. 

  101. stack_init:
    102.