3.4.2.1. status レジスター
3.4.2.2. estatus レジスター
3.4.2.3. bstatus レジスター
3.4.2.4. ienable レジスター
3.4.2.5. ipending レジスター
3.4.2.6. cpuid レジスター
3.4.2.7. exception レジスター
3.4.2.8. pteaddr レジスター
3.4.2.9. tlbacc レジスター
3.4.2.10. tlbmisc レジスター
3.4.2.11. badaddr レジスター
3.4.2.12. config レジスター
3.4.2.13. mpubase レジスター
3.4.2.14. mpuacc レジスター
8.5.1. add
8.5.2. addi
8.5.3. and
8.5.4. andhi
8.5.5. andi
8.5.6. beq
8.5.7. bge
8.5.8. bgeu
8.5.9. bgt
8.5.10. bgtu
8.5.11. ble
8.5.12. bleu
8.5.13. blt
8.5.14. bltu
8.5.15. bne
8.5.16. br
8.5.17. break
8.5.18. bret
8.5.19. call
8.5.20. callr
8.5.21. cmpeq
8.5.22. cmpeqi
8.5.23. cmpge
8.5.24. cmpgei
8.5.25. cmpgeu
8.5.26. cmpgeui
8.5.27. cmpgt
8.5.28. cmpgti
8.5.29. cmpgtu
8.5.30. cmpgtui
8.5.31. cmple
8.5.32. cmplei
8.5.33. cmpleu
8.5.34. cmpleui
8.5.35. cmplt
8.5.36. cmplti
8.5.37. cmpltu
8.5.38. cmpltui
8.5.39. cmpne
8.5.40. cmpnei
8.5.41. custom
8.5.42. div
8.5.43. divu
8.5.44. eret
8.5.45. flushd
8.5.46. flushda
8.5.47. flushi
8.5.48. flushp
8.5.49. initd
8.5.50. initda
8.5.51. initi
8.5.52. jmp
8.5.53. jmpi
8.5.54. ldb / ldbio
8.5.55. ldbu / ldbuio
8.5.56. ldh / ldhio
8.5.57. ldhu / ldhuio
8.5.58. ldw / ldwio
8.5.59. mov
8.5.60. movhi
8.5.61. movi
8.5.62. movia
8.5.63. movui
8.5.64. mul
8.5.65. muli
8.5.66. mulxss
8.5.67. mulxsu
8.5.68. mulxuu
8.5.69. nextpc
8.5.70. nop
8.5.71. nor
8.5.72. or
8.5.73. orhi
8.5.74. ori
8.5.75. rdctl
8.5.76. rdprs
8.5.77. ret
8.5.78. rol
8.5.79. roli
8.5.80. ror
8.5.81. sll
8.5.82. slli
8.5.83. sra
8.5.84. srai
8.5.85. srl
8.5.86. srli
8.5.87. stb / stbio l
8.5.88. sth / sthio
8.5.89. stw / stwio
8.5.90. sub
8.5.91. subi
8.5.92. sync
8.5.93. trap
8.5.94. wrctl
8.5.95. wrprs
8.5.96. xor
8.5.97. xorhi
8.5.98. xori
3.7.10.2. Nios II/e の例外処理
Nios II/e の例外処理における例外の原因の特定
/* With an internal interrupt controller, check for interrupt
exceptions. With an external interrupt controller, ipending is
always 0, and this check can be omitted. */
if (estatus.PIE == 1 and ipending != 0) {
handle interrupt
/* Decode exception from instruction */
/* Note: Because the exception register is included with the MMU and */
/* MPU, you never need to determine MMU or MPU exceptions by decoding */
} else {
decode instruction at $ea-4
if (instruction is trap)
handle trap exception
else if (instruction is load or store)
handle misaligned data address exception
else if (instruction is branch, bret, callr, eret, jmp, or ret)
handle misaligned destination address exception
else if (instruction is unimplemented)
handle unimplemented instruction exception
else if (instruction is illegal)
handle illegal instruction exception
else if (instruction is divide) {
if (denominator == 0)
handle division error exception
else if (instruction is signed divide and numerator == 0x80000000
and denominator == 0xffffffff)
handle division error exception
}
}
/* Not any known exception */
} else {
handle unknown exception (If internal interrupt controller
is implemented, could be spurious interrupt)
}
}