\u30c6\u30ad\u30b9\u30c8\u306e36\u30da\u30fc\u30b8<\/p>\n
\u6211\u3005\u306f\u524d\u7bc0\u3067\u3001\u3069\u306e\u30cf\u30f3\u30c9\u30e9\u3082\u30c8\u30e9\u30c3\u30d7\u30d5\u30ec\u30fc\u30e0\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3057\u3001\u305d\u3057\u3066C\u306e\u95a2\u6570\u3067\u3042\u308btrap\u3092\u547c\u3076\u3068\u3053\u308d\u3092\u898b\u3066\u304d\u305f\u3002
\ntrap\u95a2\u6570\u306f\u3001\u306a\u305c\u547c\u3070\u308c\u4f55\u3092\u3059\u3079\u304d\u304b\u6c7a\u5b9a\u3059\u308b\u305f\u3081\u306b\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30c8\u30e9\u30c3\u30d7\u756a\u53f7tf->trapno\u3092\u898b\u308b\u3002
\n\u3082\u3057\u305d\u306e\u30c8\u30e9\u30c3\u30d7\u304cT_SYSCALL\u306a\u3089\u3001trap\u95a2\u6570\u306f\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306e\u30cf\u30f3\u30c9\u30e9\u3067\u3042\u308bsyscall\u95a2\u6570\u3092\u547c\u3076\u3002
\n\u6211\u3005\u306f\u3001\u7b2c4\u7ae0\u30672\u3064\u306eproc->killed\uff08\u539f\u6587\u3067\u306fcp->killed\u306b\u306a\u3063\u3066\u308b\u3051\u3069\u591a\u5206\u9593\u9055\u3044\uff09\u306b\u3064\u3044\u3066\u518d\u691c\u8a0e\u3059\u308b\u4e88\u5b9a\u3067\u3042\u308b\u3002<\/p>\n
trap.c\u306etrap\u95a2\u6570<\/p>\n
void\ntrap(struct trapframe *tf)\n{\n if(tf->trapno == T_SYSCALL){\n if(proc->killed)\n exit();\n proc->tf = tf;\n syscall();\n if(proc->killed)\n exit();\n return;\n }\n\n switch(tf->trapno){\n case T_IRQ0 + IRQ_TIMER:\n if(cpu->id == 0){\n acquire(&tickslock);\n ticks++;\n wakeup(&ticks);\n release(&tickslock);\n }\n lapiceoi();\n break;\n case T_IRQ0 + IRQ_IDE:\n ideintr();\n lapiceoi();\n break;\n case T_IRQ0 + IRQ_IDE+1:\n \/\/ Bochs generates spurious IDE1 interrupts.\n break;\n case T_IRQ0 + IRQ_KBD:\n kbdintr();\n lapiceoi();\n break;\n case T_IRQ0 + IRQ_COM1:\n uartintr();\n lapiceoi();\n break;\n case T_IRQ0 + 7:\n case T_IRQ0 + IRQ_SPURIOUS:\n cprintf("cpu%d: spurious interrupt at %x:%x\\n",\n cpu->id, tf->cs, tf->eip);\n lapiceoi();\n break;\n \n \/\/PAGEBREAK: 13\n default:\n if(proc == 0 || (tf->cs&3) == 0){\n \/\/ In kernel, it must be our mistake.\n cprintf("unexpected trap %d from cpu %d eip %x (cr2=0x%x)\\n",\n tf->trapno, cpu->id, tf->eip, rcr2());\n panic("trap");\n }\n \/\/ In user space, assume process misbehaved.\n cprintf("pid %d %s: trap %d err %d on cpu %d "\n "eip 0x%x addr 0x%x--kill proc\\n",\n proc->pid, proc->name, tf->trapno, tf->err, cpu->id, tf->eip, \n rcr2());\n proc->killed = 1;\n }\n\n \/\/ Force process exit if it has been killed and is in user space.\n \/\/ (If it is still executing in the kernel, let it keep running \n \/\/ until it gets to the regular system call return.)\n if(proc && proc->killed && (tf->cs&3) == DPL_USER)\n exit();\n\n \/\/ Force process to give up CPU on clock tick.\n \/\/ If interrupts were on while locks held, would need to check nlock.\n if(proc && proc->state == RUNNING && tf->trapno == T_IRQ0+IRQ_TIMER)\n yield();\n\n \/\/ Check if the process has been killed since we yielded\n if(proc && proc->killed && (tf->cs&3) == DPL_USER)\n exit();\n}<\/pre>\n\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306e\u70ba\u306e\u30c1\u30a7\u30c3\u30af\u306e\u5f8c\u3001trap\u95a2\u6570\u306f\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u5272\u308a\u8fbc\u307f\u3092\u898b\u308b\u3002\uff08\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u5f8c\u3067\u8aac\u660e\u3059\u308b\u3002\uff09
\n\u4e88\u671f\u3055\u308c\u305f\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30c7\u30d0\u30a4\u30b9\u306b\u52a0\u3048\u3066\u3001trap\u95a2\u6570\u306f\u64ec\u4f3c\u5272\u308a\u8fbc\u307f\uff08\u4e0d\u5fc5\u8981\u306a\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u5272\u308a\u8fbc\u307f\uff09\u306b\u3088\u3063\u3066\u3082\u5f15\u304d\u8d77\u3053\u3055\u308c\u308b\u3002<\/p>\n
\u3082\u3057\u30c8\u30e9\u30c3\u30d7\u304c\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3084\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30c7\u30d0\u30a4\u30b9\u306e\u5272\u308a\u8fbc\u307f\u3067\u306a\u3051\u308c\u3070\u3001trap\u95a2\u6570\u306f\u305d\u308c\u3092\u30c8\u30e9\u30c3\u30d7\u306e\u524d\u306b\u5b9f\u884c\u3055\u308c\u3066\u305f\u30b3\u30fc\u30c9\u306e\u4e00\u90e8\u306b\u3088\u308b\u304a\u304b\u3057\u306a\u51e6\u7406\uff08\u4f8b\u3048\u3070\u30bc\u30ed\u9664\u7b97\uff09\u306b\u3088\u3063\u3066\u5f15\u304d\u8d77\u3053\u3055\u308c\u305f\u3082\u306e\u3060\u3068\u4eee\u5b9a\u3059\u308b\u3002
\n\u3082\u3057\u3001\u305d\u306e\u30c8\u30e9\u30c3\u30d7\u3092\u5f15\u304d\u8d77\u3053\u3057\u305f\u30b3\u30fc\u30c9\u304c\u30e6\u30fc\u30b6\u30d7\u30ed\u30b0\u30e9\u30e0\u306a\u3089\u3001xv6\u306f\u8a73\u7d30\u3092\u5370\u5b57\u3057\u3001\u305d\u3057\u3066\u305d\u306e\u30e6\u30fc\u30b6\u30d7\u30ed\u30bb\u30b9\u3092\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3059\u308b\u4e8b\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306bproc->killed\uff08\u539f\u6587\u3067\u306fcp->killed\uff09\u3092\u30bb\u30c3\u30c8\u3059\u308b\u3002
\n\u6211\u3005\u306f\u3001\u7b2c4\u7ae0\u3067xv6\u304c\u3069\u3046\u3084\u3063\u3066\u3053\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3092\u5b9f\u884c\u3059\u308b\u304b\u3092\u898b\u308b\u4e88\u5b9a\u3067\u3042\u308b\u3002<\/p>\n
\u3082\u3057\u3001\u305d\u308c\u304c\u30ab\u30fc\u30cd\u30eb\u306e\u5b9f\u884c\u4e2d\u306a\u3089\u3001\u30ab\u30fc\u30cd\u30eb\u306e\u30d0\u30b0\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u3002
\ntrap\u95a2\u6570\u306f\u3001\u305d\u306e\u9a5a\u304d\u306b\u3064\u3044\u3066\u8a73\u7d30\u3092\u5370\u5b57\u3057\u3001\u305d\u3057\u3066panic\u95a2\u6570\u3092\u547c\u3076\u3002<\/p>\n
\u611f\u60f3<\/h3>\n
trap\u95a2\u6570\u3067\u306ftf->trapno\u3067\u51e6\u7406\u3092\u5272\u308a\u632f\u308b\u3068\u3044\u3046\u8a71\u3067\u3059\u3002<\/p>\n
cp->killed\u3068proc->killed\u306b\u3064\u3044\u3066\u306f\u3001git\u306e\u30ed\u30b0\u3092\u8abf\u3079\u305f\u3068\u3053\u308d2009\/8\/31\u306brename c\/cp to cpu\/proc\u3068\u3044\u3046\u30b3\u30e1\u30f3\u30c8\u3092\u542b\u3093\u3060\u30b3\u30df\u30c3\u30c8\u304c\u3042\u308a\u305d\u3053\u3067cp\u304b\u3089proc\u306b\u5909\u66f4\u3055\u308c\u3066\u3044\u305f\u306e\u3067\u3001\u672c\u6587\u304c\u9593\u9055\u3063\u3066\u308b\uff08\u53e4\u3044\u307e\u307e\u6b8b\u3063\u3066\u308b\uff09\u306e\u3060\u308d\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u30c6\u30ad\u30b9\u30c8\u306e36\u30da\u30fc\u30b8<\/p>\n
\u672c\u6587<\/h3>\n
\u6211\u3005\u306f\u524d\u7bc0\u3067\u3001\u3069\u306e\u30cf\u30f3\u30c9\u30e9\u3082\u30c8\u30e9\u30c3\u30d7\u30d5\u30ec\u30fc\u30e0\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3057\u3001\u305d\u3057\u3066C\u306e\u95a2\u6570\u3067\u3042\u308btrap\u3092\u547c\u3076\u3068\u3053\u308d\u3092\u898b\u3066\u304d\u305f\u3002
\ntrap\u95a2\u6570\u306f\u3001\u306a\u305c\u547c\u3070\u308c\u4f55\u3092\u3059\u3079\u304d\u304b\u6c7a\u5b9a\u3059\u308b\u305f\u3081\u306b\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30c8\u30e9\u30c3\u30d7\u756a\u53f7tf->trapno\u3092\u898b\u308b\u3002
\n\u3082\u3057\u305d\u306e\u30c8\u30e9\u30c3\u30d7\u304cT_SYSCALL\u306a\u3089\u3001trap\u95a2\u6570\u306f\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306e\u30cf\u30f3\u30c9\u30e9\u3067\u3042\u308bsyscall\u95a2\u6570\u3092\u547c\u3076\u3002
\n\u6211\u3005\u306f\u3001\u7b2c4\u7ae0\u30672\u3064\u306eproc->killed\uff08\u539f\u6587\u3067\u306fcp->killed\u306b\u306a\u3063\u3066\u308b\u3051\u3069\u591a\u5206\u9593\u9055\u3044\uff09\u306b\u3064\u3044\u3066\u518d\u691c\u8a0e\u3059\u308b\u4e88\u5b9a\u3067\u3042\u308b\u3002<\/p>\n
trap.c\u306etrap\u95a2\u6570<\/p>\n
void\ntrap(struct trapframe *tf)\n{\n if(tf->trapno == T_SYSCALL){\n if(proc->killed)\n exit();\n proc->tf = tf;\n syscall();\n if(proc->killed)\n exit();\n return;\n }\n\n switch(tf->trapno){\n case T_IRQ0 + IRQ_TIMER:\n if(cpu->id == 0){\n acquire(&tickslock);\n ticks++;\n wakeup(&ticks);\n release(&tickslock);\n }\n lapiceoi();\n break;\n case T_IRQ0 + IRQ_IDE:\n ideintr();\n lapiceoi();\n break;\n case T_IRQ0 + IRQ_IDE+1:\n \/\/ Bochs generates spurious IDE1 interrupts.\n break;\n case T_IRQ0 + IRQ_KBD:\n kbdintr();\n lapiceoi();\n break;\n case T_IRQ0 + IRQ_COM1:\n uartintr();\n lapiceoi();\n break;\n case T_IRQ0 + 7:\n case T_IRQ0 + IRQ_SPURIOUS:\n cprintf("cpu%d: spurious interrupt at %x:%x\\n",\n cpu->id, tf->cs, tf->eip);\n lapiceoi();\n break;\n \n \/\/PAGEBREAK: 13\n default:\n if(proc == 0 || (tf->cs&3) == 0){\n \/\/ In kernel, it must be our mistake.\n cprintf("unexpected trap %d from cpu %d eip %x (cr2=0x%x)\\n",\n tf->trapno, cpu->id, tf->eip, rcr2());\n panic("trap");\n }\n \/\/ In user space, assume process misbehaved.\n cprintf("pid %d %s: trap %d err %d on cpu %d "\n "eip 0x%x addr 0x%x--kill proc\\n",\n proc->pid, proc->name, tf->trapno, tf->err, cpu->id, tf->eip, \n rcr2());\n proc->killed = 1;\n }\n\n \/\/ Force process exit if it has been killed and is in user space.\n \/\/ (If it is still executing in the kernel, let it keep running \n \/\/ until it gets to the regular system call return.)\n if(proc && proc->killed && (tf->cs&3) == DPL_USER)\n exit();\n\n \/\/ Force process to give up CPU on clock tick.\n \/\/ If interrupts were on while locks held, would need to check nlock.\n if(proc && proc->state == RUNNING && tf->trapno == T_IRQ0+IRQ_TIMER)\n yield();\n\n \/\/ Check if the process has been killed since we yielded\n if(proc && proc->killed && (tf->cs&3) == DPL_USER)\n exit();\n}<\/pre>\n\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306e\u70ba\u306e\u30c1\u30a7\u30c3\u30af\u306e\u5f8c\u3001trap\u95a2\u6570\u306f\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u5272\u308a\u8fbc\u307f\u3092\u898b\u308b\u3002\uff08\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u5f8c\u3067\u8aac\u660e\u3059\u308b\u3002\uff09
\n\u4e88\u671f\u3055\u308c\u305f\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30c7\u30d0\u30a4\u30b9\u306b\u52a0\u3048\u3066\u3001trap\u95a2\u6570\u306f\u64ec\u4f3c\u5272\u308a\u8fbc\u307f\uff08\u4e0d\u5fc5\u8981\u306a\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u5272\u308a\u8fbc\u307f\uff09\u306b\u3088\u3063\u3066\u3082\u5f15\u304d\u8d77\u3053\u3055\u308c\u308b\u3002<\/p>\n
\u3082\u3057\u30c8\u30e9\u30c3\u30d7\u304c\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3084\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30c7\u30d0\u30a4\u30b9\u306e\u5272\u308a\u8fbc\u307f\u3067\u306a\u3051\u308c\u3070\u3001trap\u95a2\u6570\u306f\u305d\u308c\u3092\u30c8\u30e9\u30c3\u30d7\u306e\u524d\u306b\u5b9f\u884c\u3055\u308c\u3066\u305f\u30b3\u30fc\u30c9\u306e\u4e00\u90e8\u306b\u3088\u308b\u304a\u304b\u3057\u306a\u51e6\u7406\uff08\u4f8b\u3048\u3070\u30bc\u30ed\u9664\u7b97\uff09\u306b\u3088\u3063\u3066\u5f15\u304d\u8d77\u3053\u3055\u308c\u305f\u3082\u306e\u3060\u3068\u4eee\u5b9a\u3059\u308b\u3002
\n\u3082\u3057\u3001\u305d\u306e\u30c8\u30e9\u30c3\u30d7\u3092\u5f15\u304d\u8d77\u3053\u3057\u305f\u30b3\u30fc\u30c9\u304c\u30e6\u30fc\u30b6\u30d7\u30ed\u30b0\u30e9\u30e0\u306a\u3089\u3001xv6\u306f\u8a73\u7d30\u3092\u5370\u5b57\u3057\u3001\u305d\u3057\u3066\u305d\u306e\u30e6\u30fc\u30b6\u30d7\u30ed\u30bb\u30b9\u3092\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3059\u308b\u4e8b\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306bproc->killed\uff08\u539f\u6587\u3067\u306fcp->killed\uff09\u3092\u30bb\u30c3\u30c8\u3059\u308b\u3002
\n\u6211\u3005\u306f\u3001\u7b2c4\u7ae0\u3067xv6\u304c\u3069\u3046\u3084\u3063\u3066\u3053\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3092\u5b9f\u884c\u3059\u308b\u304b\u3092\u898b\u308b\u4e88\u5b9a\u3067\u3042\u308b\u3002<\/p>\n
\u3082\u3057\u3001\u305d\u308c\u304c\u30ab\u30fc\u30cd\u30eb\u306e\u5b9f\u884c\u4e2d\u306a\u3089\u3001\u30ab\u30fc\u30cd\u30eb\u306e\u30d0\u30b0\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u3002
\ntrap\u95a2\u6570\u306f\u3001\u305d\u306e\u9a5a\u304d\u306b\u3064\u3044\u3066\u8a73\u7d30\u3092\u5370\u5b57\u3057\u3001\u305d\u3057\u3066panic\u95a2\u6570\u3092\u547c\u3076\u3002<\/p>\n
\u611f\u60f3<\/h3>\n
trap\u95a2\u6570\u3067\u306ftf->trapno\u3067\u51e6\u7406\u3092\u5272\u308a\u632f\u308b\u3068\u3044\u3046\u8a71\u3067\u3059\u3002<\/p>\n
cp->killed\u3068proc->killed\u306b\u3064\u3044\u3066\u306f\u3001git\u306e\u30ed\u30b0\u3092\u8abf\u3079\u305f\u3068\u3053\u308d2009\/8\/31\u306brename c\/cp to cpu\/proc\u3068\u3044\u3046\u30b3\u30e1\u30f3\u30c8\u3092\u542b\u3093\u3060\u30b3\u30df\u30c3\u30c8\u304c\u3042\u308a\u305d\u3053\u3067cp\u304b\u3089proc\u306b\u5909\u66f4\u3055\u308c\u3066\u3044\u305f\u306e\u3067\u3001\u672c\u6587\u304c\u9593\u9055\u3063\u3066\u308b\uff08\u53e4\u3044\u307e\u307e\u6b8b\u3063\u3066\u308b\uff09\u306e\u3060\u308d\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[405],"class_list":["post-1390","post","type-post","status-publish","format-standard","hentry","category-tech","tag-xv6"],"_links":{"self":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/posts\/1390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/comments?post=1390"}],"version-history":[{"count":0,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/posts\/1390\/revisions"}],"wp:attachment":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/media?parent=1390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/categories?post=1390"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/tags?post=1390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}