src/arch/alpha/stacktrace.cc - amd/gem5 - Git at Google

 /*
  * Copyright (c) 2005 The Regents of The University of Michigan
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met: redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer;
  * redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
  * documentation and/or other materials provided with the distribution;
  * neither the name of the copyright holders nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Authors: Nathan Binkert
  */

 #include <string>

 #include "arch/alpha/isa_traits.hh"
 #include "arch/alpha/stacktrace.hh"
 #include "arch/alpha/vtophys.hh"
 #include "base/bitfield.hh"
 #include "base/trace.hh"
 #include "cpu/base.hh"
 #include "cpu/thread_context.hh"
 #include "sim/system.hh"

 using namespace std;

 namespace AlphaISA {

 ProcessInfo::ProcessInfo(ThreadContext *_tc)
     : tc(_tc)
 {
     Addr addr = 0;
     VirtualPort *vp = tc->getVirtPort();
     SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;

     if (!symtab->findAddress("thread_info_size", addr))
         panic("thread info not compiled into kernel\n");
     thread_info_size = vp->readGtoH<int32_t>(addr);

     if (!symtab->findAddress("task_struct_size", addr))
         panic("thread info not compiled into kernel\n");
     task_struct_size = vp->readGtoH<int32_t>(addr);

     if (!symtab->findAddress("thread_info_task", addr))
         panic("thread info not compiled into kernel\n");
     task_off = vp->readGtoH<int32_t>(addr);

     if (!symtab->findAddress("task_struct_pid", addr))
         panic("thread info not compiled into kernel\n");
     pid_off = vp->readGtoH<int32_t>(addr);

     if (!symtab->findAddress("task_struct_comm", addr))
         panic("thread info not compiled into kernel\n");
     name_off = vp->readGtoH<int32_t>(addr);
 }

 Addr
 ProcessInfo::task(Addr ksp) const
 {
     Addr base = ksp & ~0x3fff;
     if (base == ULL(0xfffffc0000000000))
         return 0;

     Addr tsk;

     VirtualPort *vp;

     vp = tc->getVirtPort();
     tsk = vp->readGtoH<Addr>(base + task_off);

     return tsk;
 }

 int
 ProcessInfo::pid(Addr ksp) const
 {
     Addr task = this->task(ksp);
     if (!task)
         return -1;

     uint16_t pd;

     VirtualPort *vp;

     vp = tc->getVirtPort();
     pd = vp->readGtoH<uint16_t>(task + pid_off);

     return pd;
 }

 string
 ProcessInfo::name(Addr ksp) const
 {
     Addr task = this->task(ksp);
     if (!task)
         return "console";

     char comm[256];
     CopyStringOut(tc, comm, task + name_off, sizeof(comm));
     if (!comm[0])
         return "startup";

     return comm;
 }

 StackTrace::StackTrace()
     : tc(0), stack(64)
 {
 }

 StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
     : tc(0), stack(64)
 {
     trace(_tc, inst);
 }

 StackTrace::~StackTrace()
 {
 }

 void
 StackTrace::trace(ThreadContext *_tc, bool is_call)
 {
     tc = _tc;

     System *sys = tc->getSystemPtr();

     bool usermode =
         (tc->readMiscRegNoEffect(IPR_DTB_CM) & 0x18) != 0;

     Addr pc = tc->readNextPC();
     bool kernel = sys->kernelStart <= pc && pc <= sys->kernelEnd;

     if (usermode) {
         stack.push_back(user);
         return;
     }

     if (!kernel) {
         stack.push_back(console);
         return;
     }

     SymbolTable *symtab = sys->kernelSymtab;
     Addr ksp = tc->readIntReg(StackPointerReg);
     Addr bottom = ksp & ~0x3fff;

     if (is_call) {
         Addr addr;
         if (!symtab->findNearestAddr(pc, addr))
             panic("could not find address %#x", pc);

         stack.push_back(addr);
         pc = tc->readPC();
     }

     while (ksp > bottom) {
         Addr addr;
         if (!symtab->findNearestAddr(pc, addr))
             panic("could not find symbol for pc=%#x", pc);
         assert(pc >= addr && "symbol botch: callpc < func");

         stack.push_back(addr);

         if (isEntry(addr))
             return;

         Addr ra;
         int size;
         if (decodePrologue(ksp, pc, addr, size, ra)) {
             if (!ra)
                 return;

             if (size <= 0) {
                 stack.push_back(unknown);
                 return;
             }

             pc = ra;
             ksp += size;
         } else {
             stack.push_back(unknown);
             return;
         }

         bool kernel = sys->kernelStart <= pc && pc <= sys->kernelEnd;
         if (!kernel)
             return;

         if (stack.size() >= 1000)
             panic("unwinding too far");
     }

     panic("unwinding too far");
 }

 bool
 StackTrace::isEntry(Addr addr)
 {
     if (addr == tc->readMiscRegNoEffect(IPR_PALtemp12))
         return true;

     if (addr == tc->readMiscRegNoEffect(IPR_PALtemp7))
         return true;

     if (addr == tc->readMiscRegNoEffect(IPR_PALtemp11))
         return true;

     if (addr == tc->readMiscRegNoEffect(IPR_PALtemp21))
         return true;

     if (addr == tc->readMiscRegNoEffect(IPR_PALtemp9))
         return true;

     if (addr == tc->readMiscRegNoEffect(IPR_PALtemp2))
         return true;

     return false;
 }

 bool
 StackTrace::decodeStack(MachInst inst, int &disp)
 {
     // lda $sp, -disp($sp)
     //
     // Opcode<31:26> == 0x08
     // RA<25:21> == 30
     // RB<20:16> == 30
     // Disp<15:0>
     const MachInst mem_mask = 0xffff0000;
     const MachInst lda_pattern = 0x23de0000;
     const MachInst lda_disp_mask = 0x0000ffff;

     // subq $sp, disp, $sp
     // addq $sp, disp, $sp
     //
     // Opcode<31:26> == 0x10
     // RA<25:21> == 30
     // Lit<20:13>
     // One<12> = 1
     // Func<11:5> == 0x20 (addq)
     // Func<11:5> == 0x29 (subq)
     // RC<4:0> == 30
     const MachInst intop_mask = 0xffe01fff;
     const MachInst addq_pattern = 0x43c0141e;
     const MachInst subq_pattern = 0x43c0153e;
     const MachInst intop_disp_mask = 0x001fe000;
     const int intop_disp_shift = 13;

     if ((inst & mem_mask) == lda_pattern)
         disp = -sext<16>(inst & lda_disp_mask);
     else if ((inst & intop_mask) == addq_pattern)
         disp = -int((inst & intop_disp_mask) >> intop_disp_shift);
     else if ((inst & intop_mask) == subq_pattern)
         disp = int((inst & intop_disp_mask) >> intop_disp_shift);
     else
         return false;

     return true;
 }

 bool
 StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
 {
     // lda $stq, disp($sp)
     //
     // Opcode<31:26> == 0x08
     // RA<25:21> == ?
     // RB<20:16> == 30
     // Disp<15:0>
     const MachInst stq_mask = 0xfc1f0000;
     const MachInst stq_pattern = 0xb41e0000;
     const MachInst stq_disp_mask = 0x0000ffff;
     const MachInst reg_mask = 0x03e00000;
     const int reg_shift = 21;

     if ((inst & stq_mask) == stq_pattern) {
         reg = (inst & reg_mask) >> reg_shift;
         disp = sext<16>(inst & stq_disp_mask);
     } else {
         return false;
     }

     return true;
 }

 /*
  * Decode the function prologue for the function we're in, and note
  * which registers are stored where, and how large the stack frame is.
  */
 bool
 StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func, int &size,
                            Addr &ra)
 {
     size = 0;
     ra = 0;

     for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) {
         MachInst inst;
         CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst));

         int reg, disp;
         if (decodeStack(inst, disp)) {
             if (size) {
                 // panic("decoding frame size again");
                 return true;
             }
             size += disp;
         } else if (decodeSave(inst, reg, disp)) {
             if (!ra && reg == ReturnAddressReg) {
                 CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr));
                 if (!ra) {
                     // panic("no return address value pc=%#x\n", pc);
                     return false;
                 }
             }
         }
     }

     return true;
 }

 #if TRACING_ON
 void
 StackTrace::dump()
 {
     StringWrap name(tc->getCpuPtr()->name());
     SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;

     DPRINTFN("------ Stack ------\n");

     string symbol;
     for (int i = 0, size = stack.size(); i < size; ++i) {
         Addr addr = stack[size - i - 1];
         if (addr == user)
             symbol = "user";
         else if (addr == console)
             symbol = "console";
         else if (addr == unknown)
             symbol = "unknown";
         else
             symtab->findSymbol(addr, symbol);

         DPRINTFN("%#x: %s\n", addr, symbol);
     }
 }
 #endif

 } // namespace AlphaISA
	/*
	* Copyright (c) 2005 The Regents of The University of Michigan
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met: redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer;
	* redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution;
	* neither the name of the copyright holders nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* Authors: Nathan Binkert
	*/

	#include <string>

	#include "arch/alpha/isa_traits.hh"
	#include "arch/alpha/stacktrace.hh"
	#include "arch/alpha/vtophys.hh"
	#include "base/bitfield.hh"
	#include "base/trace.hh"
	#include "cpu/base.hh"
	#include "cpu/thread_context.hh"
	#include "sim/system.hh"

	using namespace std;

	namespace AlphaISA {

	ProcessInfo::ProcessInfo(ThreadContext *_tc)
	: tc(_tc)
	{
	Addr addr = 0;
	VirtualPort *vp = tc->getVirtPort();
	SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;

	if (!symtab->findAddress("thread_info_size", addr))
	panic("thread info not compiled into kernel\n");
	thread_info_size = vp->readGtoH<int32_t>(addr);

	if (!symtab->findAddress("task_struct_size", addr))
	panic("thread info not compiled into kernel\n");
	task_struct_size = vp->readGtoH<int32_t>(addr);

	if (!symtab->findAddress("thread_info_task", addr))
	panic("thread info not compiled into kernel\n");
	task_off = vp->readGtoH<int32_t>(addr);

	if (!symtab->findAddress("task_struct_pid", addr))
	panic("thread info not compiled into kernel\n");
	pid_off = vp->readGtoH<int32_t>(addr);

	if (!symtab->findAddress("task_struct_comm", addr))
	panic("thread info not compiled into kernel\n");
	name_off = vp->readGtoH<int32_t>(addr);
	}

	Addr
	ProcessInfo::task(Addr ksp) const
	{
	Addr base = ksp & ~0x3fff;
	if (base == ULL(0xfffffc0000000000))
	return 0;

	Addr tsk;

	VirtualPort *vp;

	vp = tc->getVirtPort();
	tsk = vp->readGtoH<Addr>(base + task_off);

	return tsk;
	}

	int
	ProcessInfo::pid(Addr ksp) const
	{
	Addr task = this->task(ksp);
	if (!task)
	return -1;

	uint16_t pd;

	VirtualPort *vp;

	vp = tc->getVirtPort();
	pd = vp->readGtoH<uint16_t>(task + pid_off);

	return pd;
	}

	string
	ProcessInfo::name(Addr ksp) const
	{
	Addr task = this->task(ksp);
	if (!task)
	return "console";

	char comm[256];
	CopyStringOut(tc, comm, task + name_off, sizeof(comm));
	if (!comm[0])
	return "startup";

	return comm;
	}

	StackTrace::StackTrace()
	: tc(0), stack(64)
	{
	}

	StackTrace::StackTrace(ThreadContext *_tc, StaticInstPtr inst)
	: tc(0), stack(64)
	{
	trace(_tc, inst);
	}

	StackTrace::~StackTrace()
	{
	}

	void
	StackTrace::trace(ThreadContext *_tc, bool is_call)
	{
	tc = _tc;

	System *sys = tc->getSystemPtr();

	bool usermode =
	(tc->readMiscRegNoEffect(IPR_DTB_CM) & 0x18) != 0;

	Addr pc = tc->readNextPC();
	bool kernel = sys->kernelStart <= pc && pc <= sys->kernelEnd;

	if (usermode) {
	stack.push_back(user);
	return;
	}

	if (!kernel) {
	stack.push_back(console);
	return;
	}

	SymbolTable *symtab = sys->kernelSymtab;
	Addr ksp = tc->readIntReg(StackPointerReg);
	Addr bottom = ksp & ~0x3fff;

	if (is_call) {
	Addr addr;
	if (!symtab->findNearestAddr(pc, addr))
	panic("could not find address %#x", pc);

	stack.push_back(addr);
	pc = tc->readPC();
	}

	while (ksp > bottom) {
	Addr addr;
	if (!symtab->findNearestAddr(pc, addr))
	panic("could not find symbol for pc=%#x", pc);
	assert(pc >= addr && "symbol botch: callpc < func");

	stack.push_back(addr);

	if (isEntry(addr))
	return;

	Addr ra;
	int size;
	if (decodePrologue(ksp, pc, addr, size, ra)) {
	if (!ra)
	return;

	if (size <= 0) {
	stack.push_back(unknown);
	return;
	}

	pc = ra;
	ksp += size;
	} else {
	stack.push_back(unknown);
	return;
	}

	bool kernel = sys->kernelStart <= pc && pc <= sys->kernelEnd;
	if (!kernel)
	return;

	if (stack.size() >= 1000)
	panic("unwinding too far");
	}

	panic("unwinding too far");
	}

	bool
	StackTrace::isEntry(Addr addr)
	{
	if (addr == tc->readMiscRegNoEffect(IPR_PALtemp12))
	return true;

	if (addr == tc->readMiscRegNoEffect(IPR_PALtemp7))
	return true;

	if (addr == tc->readMiscRegNoEffect(IPR_PALtemp11))
	return true;

	if (addr == tc->readMiscRegNoEffect(IPR_PALtemp21))
	return true;

	if (addr == tc->readMiscRegNoEffect(IPR_PALtemp9))
	return true;

	if (addr == tc->readMiscRegNoEffect(IPR_PALtemp2))
	return true;

	return false;
	}

	bool
	StackTrace::decodeStack(MachInst inst, int &disp)
	{
	// lda $sp, -disp($sp)
	//
	// Opcode<31:26> == 0x08
	// RA<25:21> == 30
	// RB<20:16> == 30
	// Disp<15:0>
	const MachInst mem_mask = 0xffff0000;
	const MachInst lda_pattern = 0x23de0000;
	const MachInst lda_disp_mask = 0x0000ffff;

	// subq $sp, disp, $sp
	// addq $sp, disp, $sp
	//
	// Opcode<31:26> == 0x10
	// RA<25:21> == 30
	// Lit<20:13>
	// One<12> = 1
	// Func<11:5> == 0x20 (addq)
	// Func<11:5> == 0x29 (subq)
	// RC<4:0> == 30
	const MachInst intop_mask = 0xffe01fff;
	const MachInst addq_pattern = 0x43c0141e;
	const MachInst subq_pattern = 0x43c0153e;
	const MachInst intop_disp_mask = 0x001fe000;
	const int intop_disp_shift = 13;

	if ((inst & mem_mask) == lda_pattern)
	disp = -sext<16>(inst & lda_disp_mask);
	else if ((inst & intop_mask) == addq_pattern)
	disp = -int((inst & intop_disp_mask) >> intop_disp_shift);
	else if ((inst & intop_mask) == subq_pattern)
	disp = int((inst & intop_disp_mask) >> intop_disp_shift);
	else
	return false;

	return true;
	}

	bool
	StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
	{
	// lda $stq, disp($sp)
	//
	// Opcode<31:26> == 0x08
	// RA<25:21> == ?
	// RB<20:16> == 30
	// Disp<15:0>
	const MachInst stq_mask = 0xfc1f0000;
	const MachInst stq_pattern = 0xb41e0000;
	const MachInst stq_disp_mask = 0x0000ffff;
	const MachInst reg_mask = 0x03e00000;
	const int reg_shift = 21;

	if ((inst & stq_mask) == stq_pattern) {
	reg = (inst & reg_mask) >> reg_shift;
	disp = sext<16>(inst & stq_disp_mask);
	} else {
	return false;
	}

	return true;
	}

	/*
	* Decode the function prologue for the function we're in, and note
	* which registers are stored where, and how large the stack frame is.
	*/
	bool
	StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func, int &size,
	Addr &ra)
	{
	size = 0;
	ra = 0;

	for (Addr pc = func; pc < callpc; pc += sizeof(MachInst)) {
	MachInst inst;
	CopyOut(tc, (uint8_t *)&inst, pc, sizeof(MachInst));

	int reg, disp;
	if (decodeStack(inst, disp)) {
	if (size) {
	// panic("decoding frame size again");
	return true;
	}
	size += disp;
	} else if (decodeSave(inst, reg, disp)) {
	if (!ra && reg == ReturnAddressReg) {
	CopyOut(tc, (uint8_t *)&ra, sp + disp, sizeof(Addr));
	if (!ra) {
	// panic("no return address value pc=%#x\n", pc);
	return false;
	}
	}
	}
	}

	return true;
	}

	#if TRACING_ON
	void
	StackTrace::dump()
	{
	StringWrap name(tc->getCpuPtr()->name());
	SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;

	DPRINTFN("------ Stack ------\n");

	string symbol;
	for (int i = 0, size = stack.size(); i < size; ++i) {
	Addr addr = stack[size - i - 1];
	if (addr == user)
	symbol = "user";
	else if (addr == console)
	symbol = "console";
	else if (addr == unknown)
	symbol = "unknown";
	else
	symtab->findSymbol(addr, symbol);

	DPRINTFN("%#x: %s\n", addr, symbol);
	}
	}
	#endif

	} // namespace AlphaISA