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/*
* 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 "arch/alpha/stacktrace.hh"
#include <string>
#include "arch/alpha/isa_traits.hh"
#include "arch/alpha/vtophys.hh"
#include "base/bitfield.hh"
#include "base/trace.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "mem/fs_translating_port_proxy.hh"
#include "sim/system.hh"
using namespace std;
namespace AlphaISA {
ProcessInfo::ProcessInfo(ThreadContext *_tc)
: tc(_tc)
{
Addr addr = 0;
FSTranslatingPortProxy &vp = tc->getVirtProxy();
SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
if (!symtab->findAddress("thread_info_size", addr))
panic("thread info not compiled into kernel\n");
thread_info_size = vp.read<int32_t>(addr, GuestByteOrder);
if (!symtab->findAddress("task_struct_size", addr))
panic("thread info not compiled into kernel\n");
task_struct_size = vp.read<int32_t>(addr, GuestByteOrder);
if (!symtab->findAddress("thread_info_task", addr))
panic("thread info not compiled into kernel\n");
task_off = vp.read<int32_t>(addr, GuestByteOrder);
if (!symtab->findAddress("task_struct_pid", addr))
panic("thread info not compiled into kernel\n");
pid_off = vp.read<int32_t>(addr, GuestByteOrder);
if (!symtab->findAddress("task_struct_comm", addr))
panic("thread info not compiled into kernel\n");
name_off = vp.read<int32_t>(addr, GuestByteOrder);
}
Addr
ProcessInfo::task(Addr ksp) const
{
Addr base = ksp & ~0x3fff;
if (base == ULL(0xfffffc0000000000))
return 0;
Addr tsk;
FSTranslatingPortProxy &vp = tc->getVirtProxy();
tsk = vp.read<Addr>(base + task_off, GuestByteOrder);
return tsk;
}
int
ProcessInfo::pid(Addr ksp) const
{
Addr task = this->task(ksp);
if (!task)
return -1;
uint16_t pd;
FSTranslatingPortProxy &vp = tc->getVirtProxy();
pd = vp.read<uint16_t>(task + pid_off, GuestByteOrder);
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, const 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->pcState().npc();
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->pcState().pc();
}
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;
}
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