Wed, 19 Feb 2014 14:03:09 -0800
8034797: AIX: Fix os::naked_short_sleep() in os_aix.cpp after 8028280
Summary: imlements os::naked_short_sleep(jlong ms) on AIX
Reviewed-by: dholmes, kvn
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright 2012, 2013 SAP AG. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #include "asm/assembler.hpp" |
aoqi@0 | 26 | #include "loadlib_aix.hpp" |
aoqi@0 | 27 | #include "porting_aix.hpp" |
aoqi@0 | 28 | #include "utilities/debug.hpp" |
aoqi@0 | 29 | |
aoqi@0 | 30 | #include <demangle.h> |
aoqi@0 | 31 | #include <sys/debug.h> |
aoqi@0 | 32 | |
aoqi@0 | 33 | ////////////////////////////////// |
aoqi@0 | 34 | // Provide implementation for dladdr based on LoadedLibraries pool and |
aoqi@0 | 35 | // traceback table scan (see getFuncName). |
aoqi@0 | 36 | |
aoqi@0 | 37 | // Search traceback table in stack, |
aoqi@0 | 38 | // return procedure name from trace back table. |
aoqi@0 | 39 | #define MAX_FUNC_SEARCH_LEN 0x10000 |
aoqi@0 | 40 | // Any PC below this value is considered toast. |
aoqi@0 | 41 | #define MINIMUM_VALUE_FOR_PC ((unsigned int*)0x1024) |
aoqi@0 | 42 | |
aoqi@0 | 43 | #define PTRDIFF_BYTES(p1,p2) (((ptrdiff_t)p1) - ((ptrdiff_t)p2)) |
aoqi@0 | 44 | |
aoqi@0 | 45 | // Align a pointer without having to cast. |
aoqi@0 | 46 | inline char* align_ptr_up(char* ptr, intptr_t alignment) { |
aoqi@0 | 47 | return (char*) align_size_up((intptr_t)ptr, alignment); |
aoqi@0 | 48 | } |
aoqi@0 | 49 | |
aoqi@0 | 50 | // Trace if verbose to tty. |
aoqi@0 | 51 | // I use these now instead of the Xtrace system because the latter is |
aoqi@0 | 52 | // not available at init time, hence worthless. Until we fix this, all |
aoqi@0 | 53 | // tracing here is done with -XX:+Verbose. |
aoqi@0 | 54 | #define trcVerbose(fmt, ...) { \ |
aoqi@0 | 55 | if (Verbose) { \ |
aoqi@0 | 56 | fprintf(stderr, fmt, ##__VA_ARGS__); \ |
aoqi@0 | 57 | fputc('\n', stderr); fflush(stderr); \ |
aoqi@0 | 58 | } \ |
aoqi@0 | 59 | } |
aoqi@0 | 60 | #define ERRBYE(s) { trcVerbose(s); return -1; } |
aoqi@0 | 61 | |
aoqi@0 | 62 | // Unfortunately, the interface of dladdr makes the implementator |
aoqi@0 | 63 | // responsible for maintaining memory for function name/library |
aoqi@0 | 64 | // name. I guess this is because most OS's keep those values as part |
aoqi@0 | 65 | // of the mapped executable image ready to use. On AIX, this doesn't |
aoqi@0 | 66 | // work, so I have to keep the returned strings. For now, I do this in |
aoqi@0 | 67 | // a primitive string map. Should this turn out to be a performance |
aoqi@0 | 68 | // problem, a better hashmap has to be used. |
aoqi@0 | 69 | class fixed_strings { |
aoqi@0 | 70 | struct node { |
aoqi@0 | 71 | char* v; |
aoqi@0 | 72 | node* next; |
aoqi@0 | 73 | }; |
aoqi@0 | 74 | |
aoqi@0 | 75 | node* first; |
aoqi@0 | 76 | |
aoqi@0 | 77 | public: |
aoqi@0 | 78 | |
aoqi@0 | 79 | fixed_strings() : first(0) {} |
aoqi@0 | 80 | ~fixed_strings() { |
aoqi@0 | 81 | node* n = first; |
aoqi@0 | 82 | while (n) { |
aoqi@0 | 83 | node* p = n; |
aoqi@0 | 84 | n = n->next; |
aoqi@0 | 85 | free(p->v); |
aoqi@0 | 86 | delete p; |
aoqi@0 | 87 | } |
aoqi@0 | 88 | } |
aoqi@0 | 89 | |
aoqi@0 | 90 | char* intern(const char* s) { |
aoqi@0 | 91 | for (node* n = first; n; n = n->next) { |
aoqi@0 | 92 | if (strcmp(n->v, s) == 0) { |
aoqi@0 | 93 | return n->v; |
aoqi@0 | 94 | } |
aoqi@0 | 95 | } |
aoqi@0 | 96 | node* p = new node; |
aoqi@0 | 97 | p->v = strdup(s); |
aoqi@0 | 98 | p->next = first; |
aoqi@0 | 99 | first = p; |
aoqi@0 | 100 | return p->v; |
aoqi@0 | 101 | } |
aoqi@0 | 102 | }; |
aoqi@0 | 103 | |
aoqi@0 | 104 | static fixed_strings dladdr_fixed_strings; |
aoqi@0 | 105 | |
aoqi@0 | 106 | // Given a code pointer, returns the function name and the displacement. |
aoqi@0 | 107 | // Function looks for the traceback table at the end of the function. |
aoqi@0 | 108 | extern "C" int getFuncName( |
aoqi@0 | 109 | codeptr_t pc, // [in] program counter |
aoqi@0 | 110 | char* p_name, size_t namelen, // [out] optional: function name ("" if not available) |
aoqi@0 | 111 | int* p_displacement, // [out] optional: displacement (-1 if not available) |
aoqi@0 | 112 | const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further |
aoqi@0 | 113 | // information (NULL if not available) |
aoqi@0 | 114 | char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages |
aoqi@0 | 115 | ) { |
aoqi@0 | 116 | struct tbtable* tb = 0; |
aoqi@0 | 117 | unsigned int searchcount = 0; |
aoqi@0 | 118 | |
aoqi@0 | 119 | // initialize output parameters |
aoqi@0 | 120 | if (p_name && namelen > 0) { |
aoqi@0 | 121 | *p_name = '\0'; |
aoqi@0 | 122 | } |
aoqi@0 | 123 | if (p_errmsg && errmsglen > 0) { |
aoqi@0 | 124 | *p_errmsg = '\0'; |
aoqi@0 | 125 | } |
aoqi@0 | 126 | if (p_displacement) { |
aoqi@0 | 127 | *p_displacement = -1; |
aoqi@0 | 128 | } |
aoqi@0 | 129 | if (p_tb) { |
aoqi@0 | 130 | *p_tb = NULL; |
aoqi@0 | 131 | } |
aoqi@0 | 132 | |
aoqi@0 | 133 | // weed out obvious bogus states |
aoqi@0 | 134 | if (pc < MINIMUM_VALUE_FOR_PC) { |
aoqi@0 | 135 | ERRBYE("invalid program counter"); |
aoqi@0 | 136 | } |
aoqi@0 | 137 | |
aoqi@0 | 138 | codeptr_t pc2 = pc; |
aoqi@0 | 139 | |
aoqi@0 | 140 | // make sure the pointer is word aligned. |
aoqi@0 | 141 | pc2 = (codeptr_t) align_ptr_up((char*)pc2, 4); |
aoqi@0 | 142 | |
aoqi@0 | 143 | // Find start of traceback table. |
aoqi@0 | 144 | // (starts after code, is marked by word-aligned (32bit) zeros) |
aoqi@0 | 145 | while ((*pc2 != NULL) && (searchcount++ < MAX_FUNC_SEARCH_LEN)) { |
aoqi@0 | 146 | pc2++; |
aoqi@0 | 147 | } |
aoqi@0 | 148 | if (*pc2 != 0) { |
aoqi@0 | 149 | ERRBYE("could not find traceback table within 5000 bytes of program counter"); |
aoqi@0 | 150 | } |
aoqi@0 | 151 | // |
aoqi@0 | 152 | // Set up addressability to the traceback table |
aoqi@0 | 153 | // |
aoqi@0 | 154 | tb = (struct tbtable*) (pc2 + 1); |
aoqi@0 | 155 | |
aoqi@0 | 156 | // Is this really a traceback table? No way to be sure but |
aoqi@0 | 157 | // some indicators we can check. |
aoqi@0 | 158 | if (tb->tb.lang >= 0xf && tb->tb.lang <= 0xfb) { |
aoqi@0 | 159 | // Language specifiers, go from 0 (C) to 14 (Objective C). |
aoqi@0 | 160 | // According to spec, 0xf-0xfa reserved, 0xfb-0xff reserved for ibm. |
aoqi@0 | 161 | ERRBYE("not a traceback table"); |
aoqi@0 | 162 | } |
aoqi@0 | 163 | |
aoqi@0 | 164 | // Existence of fields in the tbtable extension are contingent upon |
aoqi@0 | 165 | // specific fields in the base table. Check for their existence so |
aoqi@0 | 166 | // that we can address the function name if it exists. |
aoqi@0 | 167 | pc2 = (codeptr_t) tb + |
aoqi@0 | 168 | sizeof(struct tbtable_short)/sizeof(int); |
aoqi@0 | 169 | if (tb->tb.fixedparms != 0 || tb->tb.floatparms != 0) |
aoqi@0 | 170 | pc2++; |
aoqi@0 | 171 | |
aoqi@0 | 172 | if (tb->tb.has_tboff == TRUE) { |
aoqi@0 | 173 | |
aoqi@0 | 174 | // I want to know the displacement |
aoqi@0 | 175 | const unsigned int tb_offset = *pc2; |
aoqi@0 | 176 | codeptr_t start_of_procedure = |
aoqi@0 | 177 | (codeptr_t)(((char*)tb) - 4 - tb_offset); // (-4 to omit leading 0000) |
aoqi@0 | 178 | |
aoqi@0 | 179 | // Weed out the cases where we did find the wrong traceback table. |
aoqi@0 | 180 | if (pc < start_of_procedure) { |
aoqi@0 | 181 | ERRBYE("could not find (the real) traceback table within 5000 bytes of program counter"); |
aoqi@0 | 182 | } |
aoqi@0 | 183 | |
aoqi@0 | 184 | // return the displacement |
aoqi@0 | 185 | if (p_displacement) { |
aoqi@0 | 186 | (*p_displacement) = (int) PTRDIFF_BYTES(pc, start_of_procedure); |
aoqi@0 | 187 | } |
aoqi@0 | 188 | |
aoqi@0 | 189 | pc2++; |
aoqi@0 | 190 | } else { |
aoqi@0 | 191 | // return -1 for displacement |
aoqi@0 | 192 | if (p_displacement) { |
aoqi@0 | 193 | (*p_displacement) = -1; |
aoqi@0 | 194 | } |
aoqi@0 | 195 | } |
aoqi@0 | 196 | |
aoqi@0 | 197 | if (tb->tb.int_hndl == TRUE) |
aoqi@0 | 198 | pc2++; |
aoqi@0 | 199 | |
aoqi@0 | 200 | if (tb->tb.has_ctl == TRUE) |
aoqi@0 | 201 | pc2 += (*pc2) + 1; // don't care |
aoqi@0 | 202 | |
aoqi@0 | 203 | // |
aoqi@0 | 204 | // return function name if it exists. |
aoqi@0 | 205 | // |
aoqi@0 | 206 | if (p_name && namelen > 0) { |
aoqi@0 | 207 | if (tb->tb.name_present) { |
aoqi@0 | 208 | char buf[256]; |
aoqi@0 | 209 | const short l = MIN2<short>(*((short*)pc2), sizeof(buf) - 1); |
aoqi@0 | 210 | memcpy(buf, (char*)pc2 + sizeof(short), l); |
aoqi@0 | 211 | buf[l] = '\0'; |
aoqi@0 | 212 | |
aoqi@0 | 213 | p_name[0] = '\0'; |
aoqi@0 | 214 | |
aoqi@0 | 215 | // If it is a C++ name, try and demangle it using the Demangle interface (see demangle.h). |
aoqi@0 | 216 | char* rest; |
aoqi@0 | 217 | Name* const name = Demangle(buf, rest); |
aoqi@0 | 218 | if (name) { |
aoqi@0 | 219 | const char* const demangled_name = name->Text(); |
aoqi@0 | 220 | if (demangled_name) { |
aoqi@0 | 221 | strncpy(p_name, demangled_name, namelen-1); |
aoqi@0 | 222 | p_name[namelen-1] = '\0'; |
aoqi@0 | 223 | } |
aoqi@0 | 224 | delete name; |
aoqi@0 | 225 | } |
aoqi@0 | 226 | |
aoqi@0 | 227 | // Fallback: if demangling did not work, just provide the unmangled name. |
aoqi@0 | 228 | if (p_name[0] == '\0') { |
aoqi@0 | 229 | strncpy(p_name, buf, namelen-1); |
aoqi@0 | 230 | p_name[namelen-1] = '\0'; |
aoqi@0 | 231 | } |
aoqi@0 | 232 | |
aoqi@0 | 233 | } else { |
aoqi@0 | 234 | strncpy(p_name, "<nameless function>", namelen-1); |
aoqi@0 | 235 | p_name[namelen-1] = '\0'; |
aoqi@0 | 236 | } |
aoqi@0 | 237 | } |
aoqi@0 | 238 | // Return traceback table, if user wants it. |
aoqi@0 | 239 | if (p_tb) { |
aoqi@0 | 240 | (*p_tb) = tb; |
aoqi@0 | 241 | } |
aoqi@0 | 242 | |
aoqi@0 | 243 | return 0; |
aoqi@0 | 244 | } |
aoqi@0 | 245 | |
aoqi@0 | 246 | // Special implementation of dladdr for Aix based on LoadedLibraries |
aoqi@0 | 247 | // Note: dladdr returns non-zero for ok, 0 for error! |
aoqi@0 | 248 | // Note: dladdr is not posix, but a non-standard GNU extension. So this tries to |
aoqi@0 | 249 | // fulfill the contract of dladdr on Linux (see http://linux.die.net/man/3/dladdr) |
aoqi@0 | 250 | // Note: addr may be both an AIX function descriptor or a real code pointer |
aoqi@0 | 251 | // to the entry of a function. |
aoqi@0 | 252 | extern "C" |
aoqi@0 | 253 | int dladdr(void* addr, Dl_info* info) { |
aoqi@0 | 254 | |
aoqi@0 | 255 | if (!addr) { |
aoqi@0 | 256 | return 0; |
aoqi@0 | 257 | } |
aoqi@0 | 258 | |
aoqi@0 | 259 | assert(info, ""); |
aoqi@0 | 260 | |
aoqi@0 | 261 | int rc = 0; |
aoqi@0 | 262 | |
aoqi@0 | 263 | const char* const ZEROSTRING = ""; |
aoqi@0 | 264 | |
aoqi@0 | 265 | // Always return a string, even if a "" one. Linux dladdr manpage |
aoqi@0 | 266 | // does not say anything about returning NULL |
aoqi@0 | 267 | info->dli_fname = ZEROSTRING; |
aoqi@0 | 268 | info->dli_sname = ZEROSTRING; |
aoqi@0 | 269 | info->dli_saddr = NULL; |
aoqi@0 | 270 | |
aoqi@0 | 271 | address p = (address) addr; |
aoqi@0 | 272 | const LoadedLibraryModule* lib = NULL; |
aoqi@0 | 273 | |
aoqi@0 | 274 | enum { noclue, code, data } type = noclue; |
aoqi@0 | 275 | |
aoqi@0 | 276 | trcVerbose("dladdr(%p)...", p); |
aoqi@0 | 277 | |
aoqi@0 | 278 | // Note: input address may be a function. I accept both a pointer to |
aoqi@0 | 279 | // the entry of a function and a pointer to the function decriptor. |
aoqi@0 | 280 | // (see ppc64 ABI) |
aoqi@0 | 281 | lib = LoadedLibraries::find_for_text_address(p); |
aoqi@0 | 282 | if (lib) { |
aoqi@0 | 283 | type = code; |
aoqi@0 | 284 | } |
aoqi@0 | 285 | |
aoqi@0 | 286 | if (!lib) { |
aoqi@0 | 287 | // Not a pointer into any text segment. Is it a function descriptor? |
aoqi@0 | 288 | const FunctionDescriptor* const pfd = (const FunctionDescriptor*) p; |
aoqi@0 | 289 | p = pfd->entry(); |
aoqi@0 | 290 | if (p) { |
aoqi@0 | 291 | lib = LoadedLibraries::find_for_text_address(p); |
aoqi@0 | 292 | if (lib) { |
aoqi@0 | 293 | type = code; |
aoqi@0 | 294 | } |
aoqi@0 | 295 | } |
aoqi@0 | 296 | } |
aoqi@0 | 297 | |
aoqi@0 | 298 | if (!lib) { |
aoqi@0 | 299 | // Neither direct code pointer nor function descriptor. A data ptr? |
aoqi@0 | 300 | p = (address)addr; |
aoqi@0 | 301 | lib = LoadedLibraries::find_for_data_address(p); |
aoqi@0 | 302 | if (lib) { |
aoqi@0 | 303 | type = data; |
aoqi@0 | 304 | } |
aoqi@0 | 305 | } |
aoqi@0 | 306 | |
aoqi@0 | 307 | // If we did find the shared library this address belongs to (either |
aoqi@0 | 308 | // code or data segment) resolve library path and, if possible, the |
aoqi@0 | 309 | // symbol name. |
aoqi@0 | 310 | if (lib) { |
aoqi@0 | 311 | const char* const interned_libpath = |
aoqi@0 | 312 | dladdr_fixed_strings.intern(lib->get_fullpath()); |
aoqi@0 | 313 | if (interned_libpath) { |
aoqi@0 | 314 | info->dli_fname = interned_libpath; |
aoqi@0 | 315 | } |
aoqi@0 | 316 | |
aoqi@0 | 317 | if (type == code) { |
aoqi@0 | 318 | |
aoqi@0 | 319 | // For code symbols resolve function name and displacement. Use |
aoqi@0 | 320 | // displacement to calc start of function. |
aoqi@0 | 321 | char funcname[256] = ""; |
aoqi@0 | 322 | int displacement = 0; |
aoqi@0 | 323 | |
aoqi@0 | 324 | if (getFuncName((codeptr_t) p, funcname, sizeof(funcname), &displacement, |
aoqi@0 | 325 | NULL, NULL, 0) == 0) { |
aoqi@0 | 326 | if (funcname[0] != '\0') { |
aoqi@0 | 327 | const char* const interned = dladdr_fixed_strings.intern(funcname); |
aoqi@0 | 328 | info->dli_sname = interned; |
aoqi@0 | 329 | trcVerbose("... function name: %s ...", interned); |
aoqi@0 | 330 | } |
aoqi@0 | 331 | |
aoqi@0 | 332 | // From the displacement calculate the start of the function. |
aoqi@0 | 333 | if (displacement != -1) { |
aoqi@0 | 334 | info->dli_saddr = p - displacement; |
aoqi@0 | 335 | } else { |
aoqi@0 | 336 | info->dli_saddr = p; |
aoqi@0 | 337 | } |
aoqi@0 | 338 | } else { |
aoqi@0 | 339 | |
aoqi@0 | 340 | // No traceback table found. Just assume the pointer is it. |
aoqi@0 | 341 | info->dli_saddr = p; |
aoqi@0 | 342 | |
aoqi@0 | 343 | } |
aoqi@0 | 344 | |
aoqi@0 | 345 | } else if (type == data) { |
aoqi@0 | 346 | |
aoqi@0 | 347 | // For data symbols. |
aoqi@0 | 348 | info->dli_saddr = p; |
aoqi@0 | 349 | |
aoqi@0 | 350 | } else { |
aoqi@0 | 351 | ShouldNotReachHere(); |
aoqi@0 | 352 | } |
aoqi@0 | 353 | |
aoqi@0 | 354 | rc = 1; // success: return 1 [sic] |
aoqi@0 | 355 | |
aoqi@0 | 356 | } |
aoqi@0 | 357 | |
aoqi@0 | 358 | // sanity checks. |
aoqi@0 | 359 | if (rc) { |
aoqi@0 | 360 | assert(info->dli_fname, ""); |
aoqi@0 | 361 | assert(info->dli_sname, ""); |
aoqi@0 | 362 | assert(info->dli_saddr, ""); |
aoqi@0 | 363 | } |
aoqi@0 | 364 | |
aoqi@0 | 365 | return rc; // error: return 0 [sic] |
aoqi@0 | 366 | |
aoqi@0 | 367 | } |