{"id":85,"date":"2013-04-16T20:04:21","date_gmt":"2013-04-16T11:04:21","guid":{"rendered":"http:\/\/toshiyone.dip.jp\/wordpress\/?p=85"},"modified":"2013-04-16T20:04:21","modified_gmt":"2013-04-16T11:04:21","slug":"long-long%e3%81%aa%e8%bf%94%e3%82%8a%e5%80%a4%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"https:\/\/int512.net\/wordpress\/archives\/85","title":{"rendered":"long long\u306a\u8fd4\u308a\u5024\u306b\u3064\u3044\u3066"},"content":{"rendered":"

\u4eca\u65e5\u3075\u3068\u601d\u3044\u3064\u3044\u305f\u3053\u3068\u3002x86\u306aLinux\u3067gcc\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001\u666e\u901aeax\u306b\u95a2\u6570\u306e\u8fd4\u308a\u5024\u304c\u5165\u308b\u3002\u3067\u3082\u3001long long\u306f8\u30d0\u30a4\u30c8\u3064\u307e\u308a64bit\u306a\u306e\u3067\u300132bit\u306eeax\u306b\u306f\u5165\u308a\u304d\u3089\u306a\u3044\u3002\u3061\u3087\u3063\u3068\u8abf\u3079\u308c\u3070\u308f\u304b\u308b\u3053\u3068\u306a\u3093\u3060\u3051\u3069\u3001\u3053\u308c\u3092\u3069\u3046\u3084\u3063\u3066\u8fd4\u3057\u3066\u3044\u308b\u306e\u304b\u3092\u8abf\u3079\u305f\u306e\u3067\u30e1\u30e2\u3057\u3066\u304a\u304f\u3002\u74b0\u5883\u306fGentoo Linux 13.0 (amd64)\u3001gcc\u306fportage\u304b\u3089\u5165\u308c\u305f4.6.3p1.11\u3002<\/p>\n

\u307e\u305a\u3001\u9069\u5f53\u306blong long\u306a\u5024\u3092\u8fd4\u3059\u95a2\u6570\u3092\u66f8\u3044\u3066\u307f\u307e\u3059\u3002
\n[c]
\n\/* return_longlong.c *\/<\/p>\n

long long return_64bit()
\n{
\n\treturn 0x12345678deadbeef;
\n}<\/p>\n

int main()
\n{
\n\treturn_64bit();
\n}
\n[\/c]<\/p>\n

\u3053\u308c\u3092\u9069\u5f53\u306bgcc -g -m32 return_longlong.c<\/code>\u3068\u304b\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066objdump -S a.out<\/code>\u3057\u3066\u307f\u307e\u3059\u3002\u3057\u3066\u307f\u305f\u7d50\u679c\u304c\u4ee5\u4e0b\u3002<\/p>\n

080483d4 <return_64bit>:\r\nlong long return_64bit()\r\n{\r\n 80483d4:\t55                   \tpush   %ebp\r\n 80483d5:\t89 e5                \tmov    %esp,%ebp\r\n\treturn 0x12345678deadbeef;\r\n 80483d7:\tb8 ef be ad de       \tmov    $0xdeadbeef,%eax\r\n 80483dc:\tba 78 56 34 12       \tmov    $0x12345678,%edx\r\n}\r\n 80483e1:\t5d                   \tpop    %ebp\r\n 80483e2:\tc3                   \tret    <\/code><\/pre>\n
\u3064\u307e\u308a\u3001\u4e0a\u4f4d32\u30d3\u30c3\u30c8\u306fedx\u3001\u4e0b\u4f4d32\u30d3\u30c3\u30c8\u306feax\u306b\u5165\u308b\u3088\u3046\u3067\u3059\u3002cdecl\u547c\u3073\u51fa\u3057\u898f\u7d04\u3067\u306f\u95a2\u6570\u5185\u3067eax, ecx, edx\u304c\u81ea\u7531\u306b\u4f7f\u7528\u3067\u304d\u308b\u304b\u3089\u3001\u8fd4\u308a\u5024\u306e\u4e0a\u4f4d32\u30d3\u30c3\u30c8\u3092\u683c\u7d0d\u3059\u308b\u5834\u6240\u306bedx\u304c\u9078\u3070\u308c\u305f\u3093\u3060\u3068\u601d\u3044\u307e\u3059\u3002ecx\u304c\u4f7f\u7528\u3055\u308c\u306a\u3044\u7406\u7531\u306f\u3061\u3087\u3063\u3068\u601d\u3044\u3064\u304b\u306a\u3044\u3067\u3059\u3002\u6c17\u307e\u3050\u308c\u304b\u306a\uff1f<\/p>\n
\u78ba\u8a3c\u306f\u306a\u3044\u3051\u308c\u3069\u3001\u4e0b\u4f4d32\u30d3\u30c3\u30c8\u304cedx\u3067\u306f\u306a\u304feax\u306b\u5165\u308b\u306e\u306f\u3001\u3082\u3057return_64bit()\u304c32bit\u306e\u5024\u3092\u8fd4\u3059\u3060\u308d\u3046\u3068\u671f\u5f85\u3057\u3066\u547c\u3073\u51fa\u3055\u308c\u3066\u3082\u5927\u4e08\u592b\u306a\u3088\u3046\u306b\u3060\u3068\u601d\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001char\u578b\u5909\u6570\u306b32bit\u306e\u50240x12345678\u3092\u4ee3\u5165\u3057\u3088\u3046\u3068\u3057\u305f\u5834\u5408\u306b\u4e0b\u4f4d8bit\u306e0x78\u304c\u4ee3\u5165\u3055\u308c\u308b\u3001\u3064\u307e\u308a\u3001\u5165\u308a\u304d\u3089\u306a\u3044\u4e0a\u4f4d\u306e\u5024\u306f\u5207\u308a\u6368\u3066\u3089\u308c\u308b\u306e\u3068\u540c\u3058\u3067\u3059\u3002\u4eee\u306bedx\u306b\u4e0b\u4f4d\u3001eax\u306b\u4e0a\u4f4d\u3092\u5165\u308c\u3066\u3057\u307e\u3046\u3068\u3001eax\u306b32bit\u306e\u8fd4\u308a\u5024\u304c\u5165\u3063\u3066\u308b\u3068\u601d\u3063\u3066\u51e6\u7406\u3092\u884c\u3063\u305f\u5834\u5408\u3001\u4e0a\u306e\u4f8b\u3067\u8a00\u3048\u3070\u4e0b\u4f4d\u306e0xdeadbeef\u304c\u53d6\u5f97\u3057\u305f\u304b\u3063\u305f\u306e\u306b\u3001\u4e0a\u4f4d\u306e0x12345678\u304c\u53d6\u5f97\u3055\u308c\u3066\u4e0d\u90fd\u5408\u3060\u304b\u3089\u3060\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u300164bit\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3068\u3053\u3093\u306a\u611f\u3058\u3067eax\u306e64bit\u7248\u7684\u306a\u30ec\u30b8\u30b9\u30bfrax\u306b\u8fd4\u308a\u5024\u304c\u5165\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u8a66\u3057\u306b0x12345678deadbeef\u30920xdeadbeef\u306b\u5909\u3048\u3066\u30b3\u30f3\u30d1\u30a4\u30eb\u2192\u9006\u30a2\u30bb\u30f3\u30d6\u30eb\u3057\u306a\u304a\u3057\u305f\u3068\u3053\u308d\u3001\u8fd4\u308a\u5024\u304c32bit\u3067\u8868\u305b\u308c\u3070rax\u306f\u4f7f\u308f\u305aeax\u3067\u8fd4\u308a\u5024\u3092\u8fd4\u3059\u3068\u3044\u3046\u52d5\u4f5c\u3092\u3059\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n
00000000004004e4 <return_64bit>:\r\nlong long return_64bit()\r\n{\r\n  4004e4:\t55                   \tpush   %rbp\r\n  4004e5:\t48 89 e5             \tmov    %rsp,%rbp\r\n\treturn 0x12345678deadbeef;\r\n  4004e8:\t48 b8 ef be ad de 78 \tmovabs $0x12345678deadbeef,%rax\r\n  4004ef:\t56 34 12 \r\n}\r\n  4004f2:\t5d                   \tpop    %rbp\r\n  4004f3:\tc3                   \tretq   <\/code><\/pre>\n
00000000004004e4 <return_64bit>:\r\nlong long return_64bit()\r\n{\r\n  4004e4:\t55                   \tpush   %rbp\r\n  4004e5:\t48 89 e5             \tmov    %rsp,%rbp\r\n\treturn 0xdeadbeef;\r\n  4004e8:\tb8 ef be ad de       \tmov    $0xdeadbeef,%eax\r\n}\r\n  4004ed:\t5d                   \tpop    %rbp\r\n  4004ee:\tc3                   \tretq   <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u4eca\u65e5\u3075\u3068\u601d\u3044\u3064\u3044\u305f\u3053\u3068\u3002x86\u306aLinux\u3067gcc\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001\u666e\u901aeax\u306b\u95a2\u6570\u306e\u8fd4\u308a\u5024\u304c\u5165\u308b\u3002\u3067\u3082\u3001long long\u306f8\u30d0\u30a4\u30c8\u3064\u307e\u308a64bit\u306a\u306e\u3067\u300132bit\u306eeax\u306b\u306f\u5165\u308a\u304d\u3089\u306a\u3044\u3002\u3061\u3087\u3063\u3068\u8abf\u3079\u2026 \u7d9a\u304d\u3092\u8aad\u3080 »<\/a><\/span><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[5,12],"class_list":["post-85","post","type-post","status-publish","format-standard","hentry","category-3","tag-c","tag-12"],"_links":{"self":[{"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/posts\/85","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/comments?post=85"}],"version-history":[{"count":30,"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/posts\/85\/revisions"}],"predecessor-version":[{"id":115,"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/posts\/85\/revisions\/115"}],"wp:attachment":[{"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/media?parent=85"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/categories?post=85"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/int512.net\/wordpress\/wp-json\/wp\/v2\/tags?post=85"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}