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8145184: [aix] Implement os::platform_print_native_stack on AIX

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Reviewed-by: goetz
This commit is contained in:
Thomas Stuefe 2016-01-13 17:55:57 +01:00
parent b986827e32
commit 86897064bf
7 changed files with 509 additions and 144 deletions
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6
hotspot/src/os/aix/vm/decoder_aix.hpp
View File

@ -36,13 +36,15 @@ class AIXDecoder: public AbstractDecoder {
virtual bool can_decode_C_frame_in_vm() const { return true; } virtual bool can_decode_C_frame_in_vm() const { return true; }
virtual bool demangle(const char* symbol, char* buf, int buflen) { return false; } // demangled by getFuncName virtual bool demangle(const char* symbol, char* buf, int buflen) { return false; } // use AixSymbols::get_function_name to demangle
virtual bool decode(address addr, char* buf, int buflen, int* offset, const char* modulepath, bool demangle) { virtual bool decode(address addr, char* buf, int buflen, int* offset, const char* modulepath, bool demangle) {
return (::getFuncName((codeptr_t)addr, buf, buflen, offset, 0, 0, 0, demangle) == 0); return AixSymbols::get_function_name(addr, buf, buflen, offset, 0, demangle);
} }
virtual bool decode(address addr, char *buf, int buflen, int* offset, const void *base) { virtual bool decode(address addr, char *buf, int buflen, int* offset, const void *base) {
ShouldNotReachHere(); ShouldNotReachHere();
return false; return false;
} }
}; };

1
hotspot/src/os/aix/vm/misc_aix.hpp
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@ -41,7 +41,6 @@
fputc('\n', stderr); fflush(stderr); \ fputc('\n', stderr); fflush(stderr); \
} \ } \
} }
#define ERRBYE(s) { trcVerbose(s); return -1; }
#define assert0(b) assert((b), "") #define assert0(b) assert((b), "")
#define guarantee0(b) guarantee((b), "") #define guarantee0(b) guarantee((b), "")

89
hotspot/src/os/aix/vm/os_aix.cpp
View File

@ -130,61 +130,10 @@ extern "C" int getargs (procsinfo*, int, char*, int);
#define ERROR_MP_VMGETINFO_FAILED 102 #define ERROR_MP_VMGETINFO_FAILED 102
#define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
// The semantics in this file are thus that codeptr_t is a *real code ptr*.
// This means that any function taking codeptr_t as arguments will assume
// a real codeptr and won't handle function descriptors (eg getFuncName),
// whereas functions taking address as args will deal with function
// descriptors (eg os::dll_address_to_library_name).
typedef unsigned int* codeptr_t;
// Typedefs for stackslots, stack pointers, pointers to op codes.
typedef unsigned long stackslot_t;
typedef stackslot_t* stackptr_t;
// Query dimensions of the stack of the calling thread. // Query dimensions of the stack of the calling thread.
static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size); static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
static address resolve_function_descriptor_to_code_pointer(address p); static address resolve_function_descriptor_to_code_pointer(address p);
// Function to check a given stack pointer against given stack limits.
inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
if (((uintptr_t)sp) & 0x7) {
return false;
}
if (sp > stack_base) {
return false;
}
if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
return false;
}
return true;
}
// Returns true if function is a valid codepointer.
inline bool is_valid_codepointer(codeptr_t p) {
if (!p) {
return false;
}
if (((uintptr_t)p) & 0x3) {
return false;
}
if (LoadedLibraries::find_for_text_address(p, NULL) == NULL) {
return false;
}
return true;
}
// Macro to check a given stack pointer against given stack limits and to die if test fails.
#define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
}
// Macro to check the current stack pointer against given stacklimits.
#define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
address sp; \
sp = os::current_stack_pointer(); \
CHECK_STACK_PTR(sp, stack_base, stack_size); \
}
static void vmembk_print_on(outputStream* os); static void vmembk_print_on(outputStream* os);
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
@ -859,9 +808,6 @@ static void *java_start(Thread *thread) {
trcVerbose("Thread " UINT64_FORMAT ": stack not in data segment.", (uint64_t) pthread_id); trcVerbose("Thread " UINT64_FORMAT ": stack not in data segment.", (uint64_t) pthread_id);
} }
// Do some sanity checks.
CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
// Try to randomize the cache line index of hot stack frames. // Try to randomize the cache line index of hot stack frames.
// This helps when threads of the same stack traces evict each other's // This helps when threads of the same stack traces evict each other's
// cache lines. The threads can be either from the same JVM instance, or // cache lines. The threads can be either from the same JVM instance, or
@ -1028,9 +974,6 @@ bool os::create_attached_thread(JavaThread* thread) {
// initialize floating point control register // initialize floating point control register
os::Aix::init_thread_fpu_state(); os::Aix::init_thread_fpu_state();
// some sanity checks
CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
// Initial thread state is RUNNABLE // Initial thread state is RUNNABLE
osthread->set_state(RUNNABLE); osthread->set_state(RUNNABLE);
@ -1382,32 +1325,7 @@ bool os::dll_address_to_function_name(address addr, char *buf,
return false; return false;
} }
// Go through Decoder::decode to call getFuncName which reads the name from the traceback table. return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
return Decoder::decode(addr, buf, buflen, offset, demangle);
}
static int getModuleName(codeptr_t pc, // [in] program counter
char* p_name, size_t namelen, // [out] optional: function name
char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
) {
if (p_name && namelen > 0) {
*p_name = '\0';
}
if (p_errmsg && errmsglen > 0) {
*p_errmsg = '\0';
}
if (p_name && namelen > 0) {
loaded_module_t lm;
if (LoadedLibraries::find_for_text_address(pc, &lm) != NULL) {
strncpy(p_name, lm.shortname, namelen);
p_name[namelen - 1] = '\0';
}
return 0;
}
return -1;
} }
bool os::dll_address_to_library_name(address addr, char* buf, bool os::dll_address_to_library_name(address addr, char* buf,
@ -1425,10 +1343,7 @@ bool os::dll_address_to_library_name(address addr, char* buf,
return false; return false;
} }
if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) { return AixSymbols::get_module_name(addr, buf, buflen);
return true;
}
return false;
} }
// Loads .dll/.so and in case of error it checks if .dll/.so was built // Loads .dll/.so and in case of error it checks if .dll/.so was built

501
hotspot/src/os/aix/vm/porting_aix.cpp
View File

@ -23,30 +23,35 @@
*/ */
#include "asm/assembler.hpp" #include "asm/assembler.hpp"
#include "compiler/disassembler.hpp"
#include "loadlib_aix.hpp" #include "loadlib_aix.hpp"
#include "memory/allocation.hpp" #include "memory/allocation.hpp"
#include "memory/allocation.inline.hpp" #include "memory/allocation.inline.hpp"
// For CritSect
#include "misc_aix.hpp" #include "misc_aix.hpp"
#include "porting_aix.hpp" #include "porting_aix.hpp"
#include "runtime/os.hpp" #include "runtime/os.hpp"
#include "runtime/thread.hpp"
#include "utilities/debug.hpp" #include "utilities/debug.hpp"
#include <demangle.h> #include <demangle.h>
#include <sys/debug.h> #include <sys/debug.h>
#include <ucontext.h>
////////////////////////////////// //////////////////////////////////
// Provide implementation for dladdr based on LoadedLibraries pool and // Provide implementation for dladdr based on LoadedLibraries pool and
// traceback table scan (see getFuncName). // traceback table scan
// Search traceback table in stack, // Search traceback table in stack,
// return procedure name from trace back table. // return procedure name from trace back table.
#define MAX_FUNC_SEARCH_LEN 0x10000 #define MAX_FUNC_SEARCH_LEN 0x10000
// Any PC below this value is considered toast.
#define MINIMUM_VALUE_FOR_PC ((unsigned int*)0x1024)
#define PTRDIFF_BYTES(p1,p2) (((ptrdiff_t)p1) - ((ptrdiff_t)p2)) #define PTRDIFF_BYTES(p1,p2) (((ptrdiff_t)p1) - ((ptrdiff_t)p2))
// Typedefs for stackslots, stack pointers, pointers to op codes.
typedef unsigned long stackslot_t;
typedef stackslot_t* stackptr_t;
typedef unsigned int* codeptr_t;
// Unfortunately, the interface of dladdr makes the implementator // Unfortunately, the interface of dladdr makes the implementator
// responsible for maintaining memory for function name/library // responsible for maintaining memory for function name/library
// name. I guess this is because most OS's keep those values as part // name. I guess this is because most OS's keep those values as part
@ -91,15 +96,12 @@ class fixed_strings {
static fixed_strings dladdr_fixed_strings; static fixed_strings dladdr_fixed_strings;
// Given a code pointer, returns the function name and the displacement. bool AixSymbols::get_function_name (
// Function looks for the traceback table at the end of the function. address pc0, // [in] program counter
extern "C" int getFuncName(
codeptr_t pc, // [in] program counter
char* p_name, size_t namelen, // [out] optional: function name ("" if not available) char* p_name, size_t namelen, // [out] optional: function name ("" if not available)
int* p_displacement, // [out] optional: displacement (-1 if not available) int* p_displacement, // [out] optional: displacement (-1 if not available)
const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further
// information (NULL if not available) // information (NULL if not available)
char* p_errmsg, size_t errmsglen,// [out] optional: user provided buffer for error messages
bool demangle // [in] whether to demangle the name bool demangle // [in] whether to demangle the name
) { ) {
struct tbtable* tb = 0; struct tbtable* tb = 0;
@ -109,9 +111,6 @@ extern "C" int getFuncName(
if (p_name && namelen > 0) { if (p_name && namelen > 0) {
*p_name = '\0'; *p_name = '\0';
} }
if (p_errmsg && errmsglen > 0) {
*p_errmsg = '\0';
}
if (p_displacement) { if (p_displacement) {
*p_displacement = -1; *p_displacement = -1;
} }
@ -119,9 +118,12 @@ extern "C" int getFuncName(
*p_tb = NULL; *p_tb = NULL;
} }
codeptr_t pc = (codeptr_t)pc0;
// weed out obvious bogus states // weed out obvious bogus states
if (pc < MINIMUM_VALUE_FOR_PC) { if (pc < (codeptr_t)0x1000) {
ERRBYE("invalid program counter"); trcVerbose("invalid program counter");
return false;
} }
// We see random but frequent crashes in this function since some months mainly on shutdown // We see random but frequent crashes in this function since some months mainly on shutdown
@ -130,7 +132,8 @@ extern "C" int getFuncName(
// As the pc cannot be trusted to be anything sensible lets make all reads via SafeFetch. Also // As the pc cannot be trusted to be anything sensible lets make all reads via SafeFetch. Also
// bail if this is not a text address right now. // bail if this is not a text address right now.
if (!LoadedLibraries::find_for_text_address(pc, NULL)) { if (!LoadedLibraries::find_for_text_address(pc, NULL)) {
ERRBYE("not a text address"); trcVerbose("not a text address");
return false;
} }
// .. (Note that is_readable_pointer returns true if safefetch stubs are not there yet; // .. (Note that is_readable_pointer returns true if safefetch stubs are not there yet;
@ -138,10 +141,11 @@ extern "C" int getFuncName(
// error files than not having a callstack.) // error files than not having a callstack.)
#define CHECK_POINTER_READABLE(p) \ #define CHECK_POINTER_READABLE(p) \
if (!MiscUtils::is_readable_pointer(p)) { \ if (!MiscUtils::is_readable_pointer(p)) { \
ERRBYE("pc not readable"); \ trcVerbose("pc not readable"); \
return false; \
} }
codeptr_t pc2 = pc; codeptr_t pc2 = (codeptr_t) pc;
// Make sure the pointer is word aligned. // Make sure the pointer is word aligned.
pc2 = (codeptr_t) align_ptr_up((char*)pc2, 4); pc2 = (codeptr_t) align_ptr_up((char*)pc2, 4);
@ -154,7 +158,8 @@ extern "C" int getFuncName(
pc2++; pc2++;
} }
if (*pc2 != 0) { if (*pc2 != 0) {
ERRBYE("no traceback table found"); trcVerbose("no traceback table found");
return false;
} }
// //
// Set up addressability to the traceback table // Set up addressability to the traceback table
@ -166,7 +171,8 @@ extern "C" int getFuncName(
if (tb->tb.lang >= 0xf && tb->tb.lang <= 0xfb) { if (tb->tb.lang >= 0xf && tb->tb.lang <= 0xfb) {
// Language specifiers, go from 0 (C) to 14 (Objective C). // Language specifiers, go from 0 (C) to 14 (Objective C).
// According to spec, 0xf-0xfa reserved, 0xfb-0xff reserved for ibm. // According to spec, 0xf-0xfa reserved, 0xfb-0xff reserved for ibm.
ERRBYE("no traceback table found"); trcVerbose("no traceback table found");
return false;
} }
// Existence of fields in the tbtable extension are contingent upon // Existence of fields in the tbtable extension are contingent upon
@ -188,7 +194,8 @@ extern "C" int getFuncName(
// Weed out the cases where we did find the wrong traceback table. // Weed out the cases where we did find the wrong traceback table.
if (pc < start_of_procedure) { if (pc < start_of_procedure) {
ERRBYE("no traceback table found"); trcVerbose("no traceback table found");
return false;
} }
// return the displacement // return the displacement
@ -218,23 +225,19 @@ extern "C" int getFuncName(
if (p_name && namelen > 0) { if (p_name && namelen > 0) {
if (tb->tb.name_present) { if (tb->tb.name_present) {
// Copy name from text because it may not be zero terminated. // Copy name from text because it may not be zero terminated.
// 256 is good enough for most cases; do not use large buffers here. const short l = MIN2<short>(*((short*)pc2), namelen - 1);
char buf[256];
const short l = MIN2<short>(*((short*)pc2), sizeof(buf) - 1);
// Be very careful. // Be very careful.
int i = 0; char* const p = (char*)pc2 + sizeof(short); int i = 0; char* const p = (char*)pc2 + sizeof(short);
while (i < l && MiscUtils::is_readable_pointer(p + i)) { while (i < l && MiscUtils::is_readable_pointer(p + i)) {
buf[i] = p[i]; p_name[i] = p[i];
i++; i++;
} }
buf[i] = '\0'; p_name[i] = '\0';
p_name[0] = '\0';
// If it is a C++ name, try and demangle it using the Demangle interface (see demangle.h). // If it is a C++ name, try and demangle it using the Demangle interface (see demangle.h).
if (demangle) { if (demangle) {
char* rest; char* rest;
Name* const name = Demangle(buf, rest); Name* const name = Demangle(p_name, rest);
if (name) { if (name) {
const char* const demangled_name = name->Text(); const char* const demangled_name = name->Text();
if (demangled_name) { if (demangled_name) {
@ -244,24 +247,35 @@ extern "C" int getFuncName(
delete name; delete name;
} }
} }
// Fallback: if demangling did not work, just provide the unmangled name.
if (p_name[0] == '\0') {
strncpy(p_name, buf, namelen-1);
p_name[namelen-1] = '\0';
}
} else { } else {
strncpy(p_name, "<nameless function>", namelen-1); strncpy(p_name, "<nameless function>", namelen-1);
p_name[namelen-1] = '\0'; p_name[namelen-1] = '\0';
} }
} }
// Return traceback table, if user wants it. // Return traceback table, if user wants it.
if (p_tb) { if (p_tb) {
(*p_tb) = tb; (*p_tb) = tb;
} }
return 0; return true;
}
bool AixSymbols::get_module_name(address pc,
char* p_name, size_t namelen) {
if (p_name && namelen > 0) {
p_name[0] = '\0';
loaded_module_t lm;
if (LoadedLibraries::find_for_text_address(pc, &lm) != NULL) {
strncpy(p_name, lm.shortname, namelen);
p_name[namelen - 1] = '\0';
return true;
}
}
return false;
} }
// Special implementation of dladdr for Aix based on LoadedLibraries // Special implementation of dladdr for Aix based on LoadedLibraries
@ -341,8 +355,8 @@ int dladdr(void* addr, Dl_info* info) {
char funcname[256] = ""; char funcname[256] = "";
int displacement = 0; int displacement = 0;
if (getFuncName((codeptr_t) p, funcname, sizeof(funcname), &displacement, if (AixSymbols::get_function_name(p, funcname, sizeof(funcname),
NULL, NULL, 0, false) == 0) { &displacement, NULL, true)) {
if (funcname[0] != '\0') { if (funcname[0] != '\0') {
const char* const interned = dladdr_fixed_strings.intern(funcname); const char* const interned = dladdr_fixed_strings.intern(funcname);
info->dli_sname = interned; info->dli_sname = interned;
@ -385,3 +399,414 @@ int dladdr(void* addr, Dl_info* info) {
return rc; // error: return 0 [sic] return rc; // error: return 0 [sic]
} }
/////////////////////////////////////////////////////////////////////////////
// Native callstack dumping
// Print the traceback table for one stack frame.
static void print_tbtable (outputStream* st, const struct tbtable* p_tb) {
if (p_tb == NULL) {
st->print("<null>");
return;
}
switch(p_tb->tb.lang) {
case TB_C: st->print("C"); break;
case TB_FORTRAN: st->print("FORTRAN"); break;
case TB_PASCAL: st->print("PASCAL"); break;
case TB_ADA: st->print("ADA"); break;
case TB_PL1: st->print("PL1"); break;
case TB_BASIC: st->print("BASIC"); break;
case TB_LISP: st->print("LISP"); break;
case TB_COBOL: st->print("COBOL"); break;
case TB_MODULA2: st->print("MODULA2"); break;
case TB_CPLUSPLUS: st->print("C++"); break;
case TB_RPG: st->print("RPG"); break;
case TB_PL8: st->print("PL8"); break;
case TB_ASM: st->print("ASM"); break;
case TB_HPJ: st->print("HPJ"); break;
default: st->print("unknown");
}
st->print(" ");
if (p_tb->tb.globallink) {
st->print("globallink ");
}
if (p_tb->tb.is_eprol) {
st->print("eprol ");
}
if (p_tb->tb.int_proc) {
st->print("int_proc ");
}
if (p_tb->tb.tocless) {
st->print("tocless ");
}
if (p_tb->tb.fp_present) {
st->print("fp_present ");
}
if (p_tb->tb.int_hndl) {
st->print("interrupt_handler ");
}
if (p_tb->tb.uses_alloca) {
st->print("uses_alloca ");
}
if (p_tb->tb.saves_cr) {
st->print("saves_cr ");
}
if (p_tb->tb.saves_lr) {
st->print("saves_lr ");
}
if (p_tb->tb.stores_bc) {
st->print("stores_bc ");
}
if (p_tb->tb.fixup) {
st->print("fixup ");
}
if (p_tb->tb.fpr_saved > 0) {
st->print("fpr_saved:%d ", p_tb->tb.fpr_saved);
}
if (p_tb->tb.gpr_saved > 0) {
st->print("gpr_saved:%d ", p_tb->tb.gpr_saved);
}
if (p_tb->tb.fixedparms > 0) {
st->print("fixedparms:%d ", p_tb->tb.fixedparms);
}
if (p_tb->tb.floatparms > 0) {
st->print("floatparms:%d ", p_tb->tb.floatparms);
}
if (p_tb->tb.parmsonstk > 0) {
st->print("parmsonstk:%d", p_tb->tb.parmsonstk);
}
}
// Print information for pc (module, function, displacement, traceback table)
// on one line.
static void print_info_for_pc (outputStream* st, codeptr_t pc, char* buf,
size_t buf_size, bool demangle) {
const struct tbtable* tb = NULL;
int displacement = -1;
if (!MiscUtils::is_readable_pointer(pc)) {
st->print("(invalid)");
return;
}
if (AixSymbols::get_module_name((address)pc, buf, buf_size)) {
st->print("%s", buf);
} else {
st->print("(unknown module)");
}
st->print("::");
if (AixSymbols::get_function_name((address)pc, buf, buf_size,
&displacement, &tb, demangle)) {
st->print("%s", buf);
} else {
st->print("(unknown function)");
}
if (displacement == -1) {
st->print("+?");
} else {
st->print("+0x%x", displacement);
}
if (tb) {
st->fill_to(64);
st->print(" (");
print_tbtable(st, tb);
st->print(")");
}
}
static void print_stackframe(outputStream* st, stackptr_t sp, char* buf,
size_t buf_size, bool demangle) {
stackptr_t sp2 = sp;
// skip backchain
sp2++;
// skip crsave
sp2++;
// retrieve lrsave. That is the only info I need to get the function/displacement
codeptr_t lrsave = (codeptr_t) *(sp2);
st->print (PTR64_FORMAT " - " PTR64_FORMAT " ", sp2, lrsave);
if (lrsave != NULL) {
print_info_for_pc(st, lrsave, buf, buf_size, demangle);
}
}
// Function to check a given stack pointer against given stack limits.
static bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
if (((uintptr_t)sp) & 0x7) {
return false;
}
if (sp > stack_base) {
return false;
}
if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
return false;
}
return true;
}
// Returns true if function is a valid codepointer.
static bool is_valid_codepointer(codeptr_t p) {
if (!p) {
return false;
}
if (((uintptr_t)p) & 0x3) {
return false;
}
if (LoadedLibraries::find_for_text_address(p, NULL) == NULL) {
return false;
}
return true;
}
// Function tries to guess if the given combination of stack pointer, stack base
// and stack size is a valid stack frame.
static bool is_valid_frame (stackptr_t p, stackptr_t stack_base, size_t stack_size) {
if (!is_valid_stackpointer(p, stack_base, stack_size)) {
return false;
}
// First check - the occurrence of a valid backchain pointer up the stack, followed by a
// valid codeptr, counts as a good candidate.
stackptr_t sp2 = (stackptr_t) *p;
if (is_valid_stackpointer(sp2, stack_base, stack_size) && // found a valid stack pointer in the stack...
((sp2 - p) > 6) && // ... pointing upwards and not into my frame...
is_valid_codepointer((codeptr_t)(*(sp2 + 2)))) // ... followed by a code pointer after two slots...
{
return true;
}
return false;
}
// Try to relocate a stack back chain in a given stack.
// Used in callstack dumping, when the backchain is broken by an overwriter
static stackptr_t try_find_backchain (stackptr_t last_known_good_frame,
stackptr_t stack_base, size_t stack_size)
{
if (!is_valid_stackpointer(last_known_good_frame, stack_base, stack_size)) {
return NULL;
}
stackptr_t sp = last_known_good_frame;
sp += 6; // Omit next fixed frame slots.
while (sp < stack_base) {
if (is_valid_frame(sp, stack_base, stack_size)) {
return sp;
}
sp ++;
}
return NULL;
}
static void decode_instructions_at_pc(const char* header,
codeptr_t pc, int num_before,
int num_after, outputStream* st) {
// TODO: PPC port Disassembler::decode(pc, 16, 16, st);
}
void AixNativeCallstack::print_callstack_for_context(outputStream* st, const ucontext_t* context,
bool demangle, char* buf, size_t buf_size) {
#define MAX_CALLSTACK_DEPTH 50
unsigned long* sp;
unsigned long* sp_last;
int frame;
// To print the first frame, use the current value of iar:
// current entry indicated by iar (the current pc)
codeptr_t cur_iar = 0;
stackptr_t cur_sp = 0;
codeptr_t cur_rtoc = 0;
codeptr_t cur_lr = 0;
const ucontext_t* uc = (const ucontext_t*) context;
// fallback: use the current context
ucontext_t local_context;
if (!uc) {
if (getcontext(&local_context) == 0) {
uc = &local_context;
} else {
st->print_cr("No context given and getcontext failed. ");
return;
}
}
cur_iar = (codeptr_t)uc->uc_mcontext.jmp_context.iar;
cur_sp = (stackptr_t)uc->uc_mcontext.jmp_context.gpr[1];
cur_rtoc = (codeptr_t)uc->uc_mcontext.jmp_context.gpr[2];
cur_lr = (codeptr_t)uc->uc_mcontext.jmp_context.lr;
// syntax used here:
// n -------------- <-- stack_base, stack_to
// n-1 | |
// ... | older |
// ... | frames | |
// | | | stack grows downward
// ... | younger | |
// ... | frames | V
// | |
// |------------| <-- cur_sp, current stack ptr
// | |
// | unsused |
// | stack |
// | |
// . .
// . .
// . .
// . .
// | |
// 0 -------------- <-- stack_from
//
// Retrieve current stack base, size from the current thread. If there is none,
// retrieve it from the OS.
stackptr_t stack_base = NULL;
size_t stack_size = NULL;
Thread* const thread = Thread::current_or_null_safe();
if (thread) {
stack_base = (stackptr_t) thread->stack_base();
stack_size = thread->stack_size();
} else {
stack_base = (stackptr_t) os::current_stack_base();
stack_size = os::current_stack_size();
}
st->print_cr("------ current frame:");
st->print("iar: " PTR64_FORMAT " ", p2i(cur_iar));
print_info_for_pc(st, cur_iar, buf, buf_size, demangle);
st->cr();
if (cur_iar && MiscUtils::is_readable_pointer(cur_iar)) {
decode_instructions_at_pc(
"Decoded instructions at iar:",
cur_iar, 32, 16, st);
}
// Print out lr too, which may be interesting if we did jump to some bogus location;
// in those cases the new frame is not built up yet and the caller location is only
// preserved via lr register.
st->print("lr: " PTR64_FORMAT " ", p2i(cur_lr));
print_info_for_pc(st, cur_lr, buf, buf_size, demangle);
st->cr();
if (cur_lr && MiscUtils::is_readable_pointer(cur_lr)) {
decode_instructions_at_pc(
"Decoded instructions at lr:",
cur_lr, 32, 16, st);
}
// Check and print sp.
st->print("sp: " PTR64_FORMAT " ", p2i(cur_sp));
if (!is_valid_stackpointer(cur_sp, stack_base, stack_size)) {
st->print("(invalid) ");
goto cleanup;
} else {
st->print("(base - 0x%X) ", PTRDIFF_BYTES(stack_base, cur_sp));
}
st->cr();
// Check and print rtoc.
st->print("rtoc: " PTR64_FORMAT " ", p2i(cur_rtoc));
if (cur_rtoc == NULL || cur_rtoc == (codeptr_t)-1 ||
!MiscUtils::is_readable_pointer(cur_rtoc)) {
st->print("(invalid)");
} else if (((uintptr_t)cur_rtoc) & 0x7) {
st->print("(unaligned)");
}
st->cr();
st->print_cr("|---stackaddr----| |----lrsave------|: <function name>");
///
// Walk callstack.
//
// (if no context was given, use the current stack)
sp = (unsigned long*)(*(unsigned long*)cur_sp); // Stack pointer
sp_last = cur_sp;
frame = 0;
while (frame < MAX_CALLSTACK_DEPTH) {
// Check sp.
bool retry = false;
if (sp == NULL) {
// The backchain pointer was NULL. This normally means the end of the chain. But the
// stack might be corrupted, and it may be worth looking for the stack chain.
if (is_valid_stackpointer(sp_last, stack_base, stack_size) && (stack_base - 0x10) > sp_last) {
// If we are not within <guess> 0x10 stackslots of the stack base, we assume that this
// is indeed not the end of the chain but that the stack was corrupted. So lets try to
// find the end of the chain.
st->print_cr("*** back chain pointer is NULL - end of stack or broken backchain ? ***");
retry = true;
} else {
st->print_cr("*** end of backchain ***");
goto end_walk_callstack;
}
} else if (!is_valid_stackpointer(sp, stack_base, stack_size)) {
st->print_cr("*** stack pointer invalid - backchain corrupted (" PTR_FORMAT ") ***", p2i(sp));
retry = true;
} else if (sp < sp_last) {
st->print_cr("invalid stack pointer: " PTR_FORMAT " (not monotone raising)", p2i(sp));
retry = true;
}
// If backchain is broken, try to recover, by manually scanning the stack for a pattern
// which looks like a valid stack.
if (retry) {
st->print_cr("trying to recover and find backchain...");
sp = try_find_backchain(sp_last, stack_base, stack_size);
if (sp) {
st->print_cr("found something which looks like a backchain at " PTR64_FORMAT ", after 0x%x bytes... ",
p2i(sp), PTRDIFF_BYTES(sp, sp_last));
} else {
st->print_cr("did not find a backchain, giving up.");
goto end_walk_callstack;
}
}
// Print stackframe.
print_stackframe(st, sp, buf, buf_size, demangle);
st->cr();
frame ++;
// Next stack frame and link area.
sp_last = sp;
sp = (unsigned long*)(*sp);
}
// Prevent endless loops in case of invalid callstacks.
if (frame == MAX_CALLSTACK_DEPTH) {
st->print_cr("...(stopping after %d frames.", MAX_CALLSTACK_DEPTH);
}
end_walk_callstack:
st->print_cr("-----------------------");
cleanup:
return;
}

45
hotspot/src/os/aix/vm/porting_aix.hpp
View File

@ -61,24 +61,37 @@ extern "C"
#endif #endif
int dladdr(void *addr, Dl_info *info); int dladdr(void *addr, Dl_info *info);
typedef unsigned int* codeptr_t;
struct tbtable; struct tbtable;
// helper function - given a program counter, tries to locate the traceback table and class AixSymbols {
// returns info from it (like, most importantly, function name, displacement of the public:
// pc inside the function, and the traceback table itself.
#ifdef __cplusplus // Given a program counter, tries to locate the traceback table and returns info from
extern "C" // it - e.g. function name, displacement of the pc inside the function, and the traceback
#endif // table itself.
int getFuncName( static bool get_function_name (
codeptr_t pc, // [in] program counter address pc, // [in] program counter
char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name
int* p_displacement, // [out] optional: displacement int* p_displacement, // [out] optional: displacement
const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information
char* p_errmsg, size_t errmsglen, // [out] optional: user provided buffer for error messages bool demangle // [in] whether to demangle the name
bool demangle // [in] whether to demangle the name );
);
// Given a program counter, returns the name of the module (library and module) the pc points to
static bool get_module_name (
address pc, // [in] program counter
char* p_name, size_t namelen // [out] module name
);
};
class AixNativeCallstack {
public:
static void print_callstack_for_context(outputStream* st, const ucontext_t* uc,
bool demangle,
char* buf, size_t buf_size);
};
#endif // OS_AIX_VM_PORTING_AIX_HPP #endif // OS_AIX_VM_PORTING_AIX_HPP

7
hotspot/src/os_cpu/aix_ppc/vm/os_aix_ppc.cpp
View File

@ -40,6 +40,7 @@
#include "prims/jniFastGetField.hpp" #include "prims/jniFastGetField.hpp"
#include "prims/jvm.h" #include "prims/jvm.h"
#include "prims/jvm_misc.hpp" #include "prims/jvm_misc.hpp"
#include "porting_aix.hpp"
#include "runtime/arguments.hpp" #include "runtime/arguments.hpp"
#include "runtime/extendedPC.hpp" #include "runtime/extendedPC.hpp"
#include "runtime/frame.inline.hpp" #include "runtime/frame.inline.hpp"
@ -579,3 +580,9 @@ int os::extra_bang_size_in_bytes() {
return 0; return 0;
} }
bool os::platform_print_native_stack(outputStream* st, void* context, char *buf, int buf_size) {
AixNativeCallstack::print_callstack_for_context(st, (const ucontext_t*)context, true, buf, (size_t) buf_size);
return true;
}

4
hotspot/src/os_cpu/aix_ppc/vm/os_aix_ppc.hpp
View File

@ -32,4 +32,8 @@
// Note: Currently only used in 64 bit Windows implementations // Note: Currently only used in 64 bit Windows implementations
static bool register_code_area(char *low, char *high) { return true; } static bool register_code_area(char *low, char *high) { return true; }
#define PLATFORM_PRINT_NATIVE_STACK 1
static bool platform_print_native_stack(outputStream* st, void* context,
char *buf, int buf_size);
#endif // OS_CPU_AIX_PPC_VM_OS_AIX_PPC_HPP #endif // OS_CPU_AIX_PPC_VM_OS_AIX_PPC_HPP