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l64idt.S

l64idt.S 11 KB
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  1. /*
    2. 

  2.  * Interrupt/exception handling.
    3. 

  3.  */
    4. 

  4. #include "amd64l.h"
    5. 

  5. 

  6. .code64
    7. 

  7. 

  8. 	/* Interrupts.  * Let's just talk about hardware
    9. 

  9. 	* interrupts. What has to happen is that we save enough state to
    10. 

  10. 	* return to where we were, and that's all we do. Hardware needs a stack,
    11. 

  11. 	* so it pushes SS and %rsp. Hardware has to
    12. 

  12. 	* clear If, which means we have to save the flags. We might be
    13. 

  13. 	* in user mode, so we need to change CS, so we need to save
    14. 

  14. 	* CS. Finally, we have to know where we were, so we need to save
    15. 

  15. 	* the RIP. And that's all get saved.
    16. 

  16. 	* Further, if you look at idthandlers below, you see a call to intrp.
    17. 

  17. 	* So on entry to intrp, the stack looks like this:
    18. 

  18. 	* EFLAGS 24(%rsp)
    19. 

  19. 	* CS	16(%rsp)
    20. 

  20. 	* EIP of interrupted code 8(%rsp)
    21. 

  21. 	* EIP from the call from the idthandlers. (%rsp)
    22. 

  22. 	* We, finally, need to push the error code and type.,
    23. 

  23. 	* then the registers.
    24. 

  24. 	* Why the call from IDThandlers? So we can get a way to point
    25. 

  25. 	* to the type. We don't need to save 0(%rsp), we just need
    26. 

  26. 	* it to get the type. We can pop it and throw it away when
    27. 

  27. 	* needed.
    28. 

  28. 	* What does the C level function need?
    29. 

  29. 	* It needs a pointer to the Uregs, as defined in ureg.h
    30. 

  30. 	* The other problem: all the regs have to be saved, so
    31. 

  31. 	* Plan 9 code can see them all.
    32. 

  32. 	* Finally, if it's a nested interrupt, we need to know that
    33. 

  33. 	* so we don't swapgs at the wrong time.
    34. 

  34. 	* Finally, this is utterly different from how Plan 9 does it, because
    35. 

  35. 	* all args are on the stack in Plan 9. We need %rdi for the pointer.
    36. 

  36. 	* And, the final x86 mess: for some things, the error code pointer
    37. 

  37. 	* is on the stack. For others, it's not. To make the stacks
    38. 

  38. 	* look identical for the common code and exit we save %rax and line things up.
    39. 

  39. 	*/
    40. 

  40. 

  41. .globl ire
    42. 

  42. .globl irx
    43. 

  43. .globl irxe
    44. 

  44. // When we enter:
    45. 

  45. // registers are NOT saved. We need to save them all.
    46. 

  46. // return PC is on the stat8(%rsp). It should be left there.
    47. 

  47. // @ (%rsp) is the PC from the vector table.
    48. 

  48. // So indirecting on that will get us the interrupt #.
    49. 

  49. // We need to get what the return PC is pointing to into %rdi.
    50. 

  50. // We no longer need to make the stack look the same as in Plan 9
    51. 

  51. // because the arg is in %rdi
    52. 

  52. .globl _intrp
    53. 

  53. _intrp:
    54. 

  54. 	pushq	%rax // bogus error code. Makes stack look like intre.
    55. 

  55. 	// Except in this case, bogus error code is at 0(%rsp)
    56. 

  56. 	// vno pointer is at 8(%rsp)
    57. 

  57. 	MOVQ	8(%rsp), %rax
    58. 

  58. 	// Now %rax points to the vector number.
    59. 

  59. 	JMP	_intrcommon
    60. 

  60. 

  61. // For intre, error is at top of stack on trap. But then we call here
    62. 

  62. // from the interrupt vectors so error is at 8(%rsp).
    63. 

  63. // I just realized I think intre means interrupt exception, e.g. page fault.
    64. 

  64. .globl _intre
    65. 

  65. _intre:
    66. 

  66. ///jmp	_intre
    67. 

  67. 	// The error code has been pushed. How I love the x86.
    68. 

  68. 	// So the error code is ABOVE the pointer to the vector #.
    69. 

  69. 	XCHGQ	%rax, (%rsp)
    70. 

  70. 	// Now %rax points to the vector number.
    71. 

  71. 

  72. // When we get here:
    73. 

  73. // %RAX points to our vector number, i.e. "return" pc from calls below.
    74. 

  74. // For intrp, (%rsp) is bogus code, 8(%rsp) is pointer to vno
    75. 

  75. // for intre, (%rsp) is pointer to vno, 8(%rsp) is error code.
    76. 

  76. // The rest of the stack is the same.
    77. 

  77. _intrcommon:
    78. 

  78. 	// Get the vector number into %al
    79. 

  79. 	MOVb	(%rax), %al
    80. 

  80. 	ANDQ	$0xff, %rax
    81. 

  81. 	// Put that at TOS (this is plan 9 argument style)
    82. 

  82. 	XCHGQ	%rax, 0(%rsp)
    83. 

  83. 	// 0(%rsp) now has the vno
    84. 

  84. 	CMPW	$SSEL(SiCS, SsTIGDT|SsRPL0), 24(%rsp) 	/* old CS */
    85. 

  85. 	JE	_intrnested
    86. 

  86. 

  87. 	SWAPGS
    88. 

  88. 

  89. _intrnested:
    90. 

  90. 	incq ire
    91. 

  91. 	PUSHQ	%r15
    92. 

  92. 	PUSHQ	%r14
    93. 

  93. 	PUSHQ	%r13
    94. 

  94. 	PUSHQ	%r12
    95. 

  95. 	PUSHQ	%r11
    96. 

  96. 	PUSHQ	%r10
    97. 

  97. 	PUSHQ	%r9
    98. 

  98. 	PUSHQ	%r8
    99. 

  99. 	PUSHQ	%rBP
    100. 

  100. 	PUSHQ	%rDI
    101. 

  101. 	PUSHQ	%rSI
    102. 

  102. 	PUSHQ	%rDX
    103. 

  103. 	PUSHQ	%rCX
    104. 

  104. 	PUSHQ	%rbx
    105. 

  105. 	PUSHQ	%rax
    106. 

  106. 

  107. 	MOVQ	%rsp, %rdi // it's ok, we saved %rdi.
    108. 

  108. 	CALL	_trap
    109. 

  109. .globl _intrr
    110. 

  110. _intrr:
    111. 

  111. 	incq	irxe
    112. 

  112. 	POPQ	%rax
    113. 

  113. 	POPQ	%rbx
    114. 

  114. 	POPQ	%rCX
    115. 

  115. 	POPQ	%rDX
    116. 

  116. 	POPQ	%rSI
    117. 

  117. 	POPQ	%rDI
    118. 

  118. 	POPQ	%rBP
    119. 

  119. 	POPQ	%r8
    120. 

  120. 	POPQ	%r9
    121. 

  121. 	POPQ	%r10
    122. 

  122. 	POPQ	%r11
    123. 

  123. 	POPQ	%r12
    124. 

  124. 	POPQ	%r13
    125. 

  125. 	POPQ	%r14
    126. 

  126. 	POPQ	%r15
    127. 

  127. 

  128. 	CMPW	$SSEL(SiCS, SsTIGDT|SsRPL0), 24(%rsp) 	/* old CS */
    129. 

  129. 	JE	_iretnested
    130. 

  130. 

  131. 	SWAPGS
    132. 

  132. 

  133. _iretnested:
    134. 

  134. 	// Throw away:
    135. 

  135. 	// The %rax you pushed (error code)
    136. 

  136. 	// EIP from the vector table.
    137. 

  137. 	ADDQ	$16, %rsp
    138. 

  138. 	incq irx
    139. 

  139. 	iretq
    140. 

  140. 

  141. .globl idthandlers
    142. 

  142. idthandlers:
    143. 

  143. 	call _intrp; .byte IdtDE		/* #DE Divide-by-Zero Error */
    144. 

  144. 	call _intrp; .byte IdtDB		/* #DB Debug */
    145. 

  145. 	call _intrp; .byte IdtNMI		/* #NMI Borked */
    146. 

  146. 	call _intrp; .byte IdtBP		/* #BP Breakpoint */
    147. 

  147. 	call _intrp; .byte IdtOF		/* #OF Overflow */
    148. 

  148. 	call _intrp; .byte IdtBR		/* #BR Bound-Range */
    149. 

  149. 	call _intrp; .byte IdtUD		/* #UD Invalid-Opcode */
    150. 

  150. 	call _intrp; .byte IdtNM		/* #NM Device-Not-Available */
    151. 

  151. 	call _intre; .byte IdtDF		/* #DF Double-Fault */
    152. 

  152. 	call _intrp; .byte Idt09		/* reserved */
    153. 

  153. 	call _intre; .byte IdtTS		/* #TS Invalid-TSS */
    154. 

  154. 	call _intre; .byte IdtNP		/* #NP Segment-Not-Present */
    155. 

  155. 	call _intre; .byte IdtSS		/* #SS Stack */
    156. 

  156. 	call _intre; .byte IdtGP		/* #GP General-Protection */
    157. 

  157. 	call _intre; .byte IdtPF		/* #PF Page-Fault */
    158. 

  158. 	call _intrp; .byte Idt0F		/* reserved */
    159. 

  159. 	call _intrp; .byte IdtMF		/* #MF x87 FPE-Pending */
    160. 

  160. 	call _intre; .byte IdtAC		/* #AC Alignment-Check */
    161. 

  161. 	call _intrp; .byte IdtMC		/* #MC Machine-Check */
    162. 

  162. 	call _intrp; .byte IdtXF		/* #XF SIMD Floating-Point */
    163. 

  163. 	call _intrp; .byte 0x14		/* reserved */
    164. 

  164. 	call _intrp; .byte 0x15		/* reserved */
    165. 

  165. 	call _intrp; .byte 0x16		/* reserved */
    166. 

  166. 	call _intrp; .byte 0x17		/* reserved */
    167. 

  167. 	call _intrp; .byte 0x18		/* reserved */
    168. 

  168. 	call _intrp; .byte 0x19		/* reserved */
    169. 

  169. 	call _intrp; .byte 0x1a		/* reserved */
    170. 

  170. 	call _intrp; .byte 0x1b		/* reserved */
    171. 

  171. 	call _intrp; .byte 0x1c		/* reserved */
    172. 

  172. 	call _intrp; .byte 0x1d		/* reserved */
    173. 

  173. 	call _intrp; .byte 0x1e		/* reserved */
    174. 

  174. 	call _intrp; .byte 0x1f		/* reserved */
    175. 

  175. 	call _intrp; .byte 0x20
    176. 

  176. 	call _intrp; .byte 0x21
    177. 

  177. 	call _intrp; .byte 0x22
    178. 

  178. 	call _intrp; .byte 0x23
    179. 

  179. 	call _intrp; .byte 0x24
    180. 

  180. 	call _intrp; .byte 0x25
    181. 

  181. 	call _intrp; .byte 0x26
    182. 

  182. 	call _intrp; .byte 0x27
    183. 

  183. 	call _intrp; .byte 0x28
    184. 

  184. 	call _intrp; .byte 0x29
    185. 

  185. 	call _intrp; .byte 0x2a
    186. 

  186. 	call _intrp; .byte 0x2b
    187. 

  187. 	call _intrp; .byte 0x2c
    188. 

  188. 	call _intrp; .byte 0x2d
    189. 

  189. 	call _intrp; .byte 0x2e
    190. 

  190. 	call _intrp; .byte 0x2f
    191. 

  191. 	call _intrp; .byte 0x30
    192. 

  192. 	call _intrp; .byte 0x31
    193. 

  193. 	call _intrp; .byte 0x32
    194. 

  194. 	call _intrp; .byte 0x33
    195. 

  195. 	call _intrp; .byte 0x34
    196. 

  196. 	call _intrp; .byte 0x35
    197. 

  197. 	call _intrp; .byte 0x36
    198. 

  198. 	call _intrp; .byte 0x37
    199. 

  199. 	call _intrp; .byte 0x38
    200. 

  200. 	call _intrp; .byte 0x39
    201. 

  201. 	call _intrp; .byte 0x3a
    202. 

  202. 	call _intrp; .byte 0x3b
    203. 

  203. 	call _intrp; .byte 0x3c
    204. 

  204. 	call _intrp; .byte 0x3d
    205. 

  205. 	call _intrp; .byte 0x3e
    206. 

  206. 	call _intrp; .byte 0x3f
    207. 

  207. 	call _intrp; .byte 0x40
    208. 

  208. 	call _intrp; .byte 0x41
    209. 

  209. 	call _intrp; .byte 0x42
    210. 

  210. 	call _intrp; .byte 0x43
    211. 

  211. 	call _intrp; .byte 0x44
    212. 

  212. 	call _intrp; .byte 0x45
    213. 

  213. 	call _intrp; .byte 0x46
    214. 

  214. 	call _intrp; .byte 0x47
    215. 

  215. 	call _intrp; .byte 0x48
    216. 

  216. 	call _intrp; .byte 0x49
    217. 

  217. 	call _intrp; .byte 0x4a
    218. 

  218. 	call _intrp; .byte 0x4b
    219. 

  219. 	call _intrp; .byte 0x4c
    220. 

  220. 	call _intrp; .byte 0x4d
    221. 

  221. 	call _intrp; .byte 0x4e
    222. 

  222. 	call _intrp; .byte 0x4f
    223. 

  223. 	call _intrp; .byte 0x50
    224. 

  224. 	call _intrp; .byte 0x51
    225. 

  225. 	call _intrp; .byte 0x52
    226. 

  226. 	call _intrp; .byte 0x53
    227. 

  227. 	call _intrp; .byte 0x54
    228. 

  228. 	call _intrp; .byte 0x55
    229. 

  229. 	call _intrp; .byte 0x56
    230. 

  230. 	call _intrp; .byte 0x57
    231. 

  231. 	call _intrp; .byte 0x58
    232. 

  232. 	call _intrp; .byte 0x59
    233. 

  233. 	call _intrp; .byte 0x5a
    234. 

  234. 	call _intrp; .byte 0x5b
    235. 

  235. 	call _intrp; .byte 0x5c
    236. 

  236. 	call _intrp; .byte 0x5d
    237. 

  237. 	call _intrp; .byte 0x5e
    238. 

  238. 	call _intrp; .byte 0x5f
    239. 

  239. 	call _intrp; .byte 0x60
    240. 

  240. 	call _intrp; .byte 0x61
    241. 

  241. 	call _intrp; .byte 0x62
    242. 

  242. 	call _intrp; .byte 0x63
    243. 

  243. 	call _intrp; .byte 0x64
    244. 

  244. 	call _intrp; .byte 0x65
    245. 

  245. 	call _intrp; .byte 0x66
    246. 

  246. 	call _intrp; .byte 0x67
    247. 

  247. 	call _intrp; .byte 0x68
    248. 

  248. 	call _intrp; .byte 0x69
    249. 

  249. 	call _intrp; .byte 0x6a
    250. 

  250. 	call _intrp; .byte 0x6b
    251. 

  251. 	call _intrp; .byte 0x6c
    252. 

  252. 	call _intrp; .byte 0x6d
    253. 

  253. 	call _intrp; .byte 0x6e
    254. 

  254. 	call _intrp; .byte 0x6f
    255. 

  255. 	call _intrp; .byte 0x70
    256. 

  256. 	call _intrp; .byte 0x71
    257. 

  257. 	call _intrp; .byte 0x72
    258. 

  258. 	call _intrp; .byte 0x73
    259. 

  259. 	call _intrp; .byte 0x74
    260. 

  260. 	call _intrp; .byte 0x75
    261. 

  261. 	call _intrp; .byte 0x76
    262. 

  262. 	call _intrp; .byte 0x77
    263. 

  263. 	call _intrp; .byte 0x78
    264. 

  264. 	call _intrp; .byte 0x79
    265. 

  265. 	call _intrp; .byte 0x7a
    266. 

  266. 	call _intrp; .byte 0x7b
    267. 

  267. 	call _intrp; .byte 0x7c
    268. 

  268. 	call _intrp; .byte 0x7d
    269. 

  269. 	call _intrp; .byte 0x7e
    270. 

  270. 	call _intrp; .byte 0x7f
    271. 

  271. 	call _intrp; .byte 0x80
    272. 

  272. 	call _intrp; .byte 0x81
    273. 

  273. 	call _intrp; .byte 0x82
    274. 

  274. 	call _intrp; .byte 0x83
    275. 

  275. 	call _intrp; .byte 0x84
    276. 

  276. 	call _intrp; .byte 0x85
    277. 

  277. 	call _intrp; .byte 0x86
    278. 

  278. 	call _intrp; .byte 0x87
    279. 

  279. 	call _intrp; .byte 0x88
    280. 

  280. 	call _intrp; .byte 0x89
    281. 

  281. 	call _intrp; .byte 0x8a
    282. 

  282. 	call _intrp; .byte 0x8b
    283. 

  283. 	call _intrp; .byte 0x8c
    284. 

  284. 	call _intrp; .byte 0x8d
    285. 

  285. 	call _intrp; .byte 0x8e
    286. 

  286. 	call _intrp; .byte 0x8f
    287. 

  287. 	call _intrp; .byte 0x90
    288. 

  288. 	call _intrp; .byte 0x91
    289. 

  289. 	call _intrp; .byte 0x92
    290. 

  290. 	call _intrp; .byte 0x93
    291. 

  291. 	call _intrp; .byte 0x94
    292. 

  292. 	call _intrp; .byte 0x95
    293. 

  293. 	call _intrp; .byte 0x96
    294. 

  294. 	call _intrp; .byte 0x97
    295. 

  295. 	call _intrp; .byte 0x98
    296. 

  296. 	call _intrp; .byte 0x99
    297. 

  297. 	call _intrp; .byte 0x9a
    298. 

  298. 	call _intrp; .byte 0x9b
    299. 

  299. 	call _intrp; .byte 0x9c
    300. 

  300. 	call _intrp; .byte 0x9d
    301. 

  301. 	call _intrp; .byte 0x9e
    302. 

  302. 	call _intrp; .byte 0x9f
    303. 

  303. 	call _intrp; .byte 0xa0
    304. 

  304. 	call _intrp; .byte 0xa1
    305. 

  305. 	call _intrp; .byte 0xa2
    306. 

  306. 	call _intrp; .byte 0xa3
    307. 

  307. 	call _intrp; .byte 0xa4
    308. 

  308. 	call _intrp; .byte 0xa5
    309. 

  309. 	call _intrp; .byte 0xa6
    310. 

  310. 	call _intrp; .byte 0xa7
    311. 

  311. 	call _intrp; .byte 0xa8
    312. 

  312. 	call _intrp; .byte 0xa9
    313. 

  313. 	call _intrp; .byte 0xaa
    314. 

  314. 	call _intrp; .byte 0xab
    315. 

  315. 	call _intrp; .byte 0xac
    316. 

  316. 	call _intrp; .byte 0xad
    317. 

  317. 	call _intrp; .byte 0xae
    318. 

  318. 	call _intrp; .byte 0xaf
    319. 

  319. 	call _intrp; .byte 0xb0
    320. 

  320. 	call _intrp; .byte 0xb1
    321. 

  321. 	call _intrp; .byte 0xb2
    322. 

  322. 	call _intrp; .byte 0xb3
    323. 

  323. 	call _intrp; .byte 0xb4
    324. 

  324. 	call _intrp; .byte 0xb5
    325. 

  325. 	call _intrp; .byte 0xb6
    326. 

  326. 	call _intrp; .byte 0xb7
    327. 

  327. 	call _intrp; .byte 0xb8
    328. 

  328. 	call _intrp; .byte 0xb9
    329. 

  329. 	call _intrp; .byte 0xba
    330. 

  330. 	call _intrp; .byte 0xbb
    331. 

  331. 	call _intrp; .byte 0xbc
    332. 

  332. 	call _intrp; .byte 0xbd
    333. 

  333. 	call _intrp; .byte 0xbe
    334. 

  334. 	call _intrp; .byte 0xbf
    335. 

  335. 	call _intrp; .byte 0xc0
    336. 

  336. 	call _intrp; .byte 0xc1
    337. 

  337. 	call _intrp; .byte 0xc2
    338. 

  338. 	call _intrp; .byte 0xc3
    339. 

  339. 	call _intrp; .byte 0xc4
    340. 

  340. 	call _intrp; .byte 0xc5
    341. 

  341. 	call _intrp; .byte 0xc6
    342. 

  342. 	call _intrp; .byte 0xc7
    343. 

  343. 	call _intrp; .byte 0xc8
    344. 

  344. 	call _intrp; .byte 0xc9
    345. 

  345. 	call _intrp; .byte 0xca
    346. 

  346. 	call _intrp; .byte 0xcb
    347. 

  347. 	call _intrp; .byte 0xcc
    348. 

  348. 	call _intrp; .byte 0xce
    349. 

  349. 	call _intrp; .byte 0xce
    350. 

  350. 	call _intrp; .byte 0xcf
    351. 

  351. 	call _intrp; .byte 0xd0
    352. 

  352. 	call _intrp; .byte 0xd1
    353. 

  353. 	call _intrp; .byte 0xd2
    354. 

  354. 	call _intrp; .byte 0xd3
    355. 

  355. 	call _intrp; .byte 0xd4
    356. 

  356. 	call _intrp; .byte 0xd5
    357. 

  357. 	call _intrp; .byte 0xd6
    358. 

  358. 	call _intrp; .byte 0xd7
    359. 

  359. 	call _intrp; .byte 0xd8
    360. 

  360. 	call _intrp; .byte 0xd9
    361. 

  361. 	call _intrp; .byte 0xda
    362. 

  362. 	call _intrp; .byte 0xdb
    363. 

  363. 	call _intrp; .byte 0xdc
    364. 

  364. 	call _intrp; .byte 0xdd
    365. 

  365. 	call _intrp; .byte 0xde
    366. 

  366. 	call _intrp; .byte 0xdf
    367. 

  367. 	call _intrp; .byte 0xe0
    368. 

  368. 	call _intrp; .byte 0xe1
    369. 

  369. 	call _intrp; .byte 0xe2
    370. 

  370. 	call _intrp; .byte 0xe3
    371. 

  371. 	call _intrp; .byte 0xe4
    372. 

  372. 	call _intrp; .byte 0xe5
    373. 

  373. 	call _intrp; .byte 0xe6
    374. 

  374. 	call _intrp; .byte 0xe7
    375. 

  375. 	call _intrp; .byte 0xe8
    376. 

  376. 	call _intrp; .byte 0xe9
    377. 

  377. 	call _intrp; .byte 0xea
    378. 

  378. 	call _intrp; .byte 0xeb
    379. 

  379. 	call _intrp; .byte 0xec
    380. 

  380. 	call _intrp; .byte 0xed
    381. 

  381. 	call _intrp; .byte 0xee
    382. 

  382. 	call _intrp; .byte 0xef
    383. 

  383. 	call _intrp; .byte 0xf0
    384. 

  384. 	call _intrp; .byte 0xf1
    385. 

  385. 	call _intrp; .byte 0xf2
    386. 

  386. 	call _intrp; .byte 0xf3
    387. 

  387. 	call _intrp; .byte 0xf4
    388. 

  388. 	call _intrp; .byte 0xf5
    389. 

  389. 	call _intrp; .byte 0xf6
    390. 

  390. 	call _intrp; .byte 0xf7
    391. 

  391. 	call _intrp; .byte 0xf8
    392. 

  392. 	call _intrp; .byte 0xf9
    393. 

  393. 	call _intrp; .byte 0xfa
    394. 

  394. 	call _intrp; .byte 0xfb
    395. 

  395. 	call _intrp; .byte 0xfc
    396. 

  396. 	call _intrp; .byte 0xfd
    397. 

  397. 	call _intrp; .byte 0xfe
    398. 

  398. 	call _intrp; .byte 0xff
    399.