/*
- * Copyright (c) 2006 The Regents of The University of Michigan
+ * Copyright (c) 2006-2007 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
bool SparcTraceChild::update(int pid)
{
- static const int stackBias = 2047;
memcpy(&oldregs, &theregs, sizeof(regs));
memcpy(&oldfpregs, &thefpregs, sizeof(fpu));
memcpy(oldLocals, locals, 8 * sizeof(uint64_t));
cerr << "Update failed" << endl;
return false;
}
- uint64_t StackPointer = getRegVal(O6);
+ uint64_t StackPointer = getSP();
+ const int stackBias = (StackPointer % 1) ? 2047 : 0;
for(unsigned int x = 0; x < 8; x++)
{
locals[x] = ptrace(PTRACE_PEEKTEXT, pid,
regDiffSinceUpdate[x] = false;
}
+int SparcTraceChild::getTargets(uint32_t inst, uint64_t pc, uint64_t npc,
+ uint64_t &target1, uint64_t &target2)
+{
+ //We can identify the instruction categories we care about using the top
+ //10 bits of the instruction, excluding the annul bit in the 3rd most
+ //significant bit position and the condition field. We'll call these
+ //bits the "sig" for signature.
+ uint32_t sig = (inst >> 22) & 0x307;
+ uint32_t cond = (inst >> 25) & 0xf;
+ bool annul = (inst & (1 << 29));
+
+ //Check if it's a ba...
+ bool ba = (cond == 0x8) &&
+ (sig == 0x1 || sig == 0x2 || sig == 0x5 || sig == 0x6);
+ //or a bn...
+ bool bn = (cond == 0x0) &&
+ (sig == 0x1 || sig == 0x2 || sig == 0x5 || sig == 0x6);
+ //or a bcc
+ bool bcc = (cond & 0x7) &&
+ (sig == 0x1 || sig == 0x2 || sig == 0x3 || sig == 0x5 || sig == 0x6);
+
+ if(annul)
+ {
+ if(bcc)
+ {
+ target1 = npc;
+ target2 = npc + 4;
+ return 2;
+ }
+ else if(ba)
+ {
+ //This branches immediately to the effective address of the branch
+ //which we'll have to calculate.
+ uint64_t disp = 0;
+ int64_t extender = 0;
+ //Figure out how big the displacement field is, and grab the bits
+ if(sig == 0x1 || sig == 0x5)
+ {
+ disp = inst & ((1 << 19) - 1);
+ extender = 1 << 18;
+ }
+ else
+ {
+ disp = inst & ((1 << 22) - 1);
+ extender = 1 << 21;
+ }
+ //This does sign extension, believe it or not.
+ disp = (disp ^ extender) - extender;
+ //Multiply the displacement by 4. I'm assuming the compiler is
+ //smart enough to turn this into a shift.
+ disp *= 4;
+ target1 = pc + disp;
+ }
+ else if(bn)
+ target1 = npc + 4;
+ else
+ target1 = npc;
+ return 1;
+ }
+ else
+ {
+ target1 = npc;
+ return 1;
+ }
+}
+
bool SparcTraceChild::step()
{
+ //Increment the count of the number of instructions executed
+ instructions++;
//Two important considerations are that the address of the instruction
//being breakpointed should be word (64bit) aligned, and that both the
//next instruction and the instruction after that need to be breakpointed
* Useful constants
*/
const static uint64_t breakInst = 0x91d02001;
+ const static uint64_t lowBreakInst = breakInst;
+ const static uint64_t highBreakInst = breakInst << 32;
const static uint64_t breakWord = breakInst | (breakInst << 32);
const static uint64_t lowMask = 0xFFFFFFFFULL;
const static uint64_t highMask = lowMask << 32;
bool unalignedNPC = nextPC & 7;
uint64_t alignedNPC = nextPC & (~7);
- /*
- * Store the original contents of the child process's memory
- */
- originalInst = ptrace(PTRACE_PEEKTEXT, pid, alignedNPC, 0);
- //Save a ptrace call if we can
- if(unalignedNPC)
- {
- originalAnnulInst = ptrace(PTRACE_PEEKTEXT, pid, alignedNPC+8, 0);
- }
+ //Get the current instruction
+ uint64_t curInst = ptrace(PTRACE_PEEKTEXT, pid, alignedPC);
+ curInst = unalignedPC ? (curInst & 0xffffffffULL) : (curInst >> 32);
- /*
- * Prepare breakpointed copies of child processes memory
- */
- uint64_t newInst, newAnnulInst;
- //If the current instruction is in the same word as the npc
- if(alignedPC == alignedNPC)
- {
- //Make sure we only replace the other part
- if(unalignedPC)
- newInst = (originalInst & lowMask) | (breakWord & highMask);
- else
- newInst = (originalInst & highMask) | (breakWord & lowMask);
- }
- else
- {
- //otherwise replace the whole thing
- newInst = breakWord;
- }
- //If the current instruction is in the same word as the word after
- //the npc
- if(alignedPC == alignedNPC+8)
- {
- //Make sure we only replace the other part
- if(unalignedPC)
- newAnnulInst = (originalAnnulInst & lowMask) | (breakWord & highMask);
- else
- newAnnulInst = (originalAnnulInst & highMask) | (breakWord & lowMask);
- }
- else
- {
- //otherwise replace the whole thing
- newAnnulInst = breakWord;
- }
+ uint64_t bp1, bp2;
+ int numTargets = getTargets(curInst, currentPC, nextPC, bp1, bp2);
+ assert(numTargets == 1 || numTargets == 2);
+
+ bool unalignedBp1 = bp1 & 7;
+ uint64_t alignedBp1 = bp1 & (~7);
+ bool unalignedBp2 = bp2 & 7;
+ uint64_t alignedBp2 = bp2 & (~7);
+ uint64_t origBp1, origBp2;
/*
- * Stuff the breakpoint instructions into the child's address space.
+ * Set the first breakpoint
*/
- //Replace the word at npc
- if(ptrace(PTRACE_POKETEXT, pid, alignedNPC, newInst) != 0)
+ origBp1 = ptrace(PTRACE_PEEKTEXT, pid, alignedBp1, 0);
+ uint64_t newBp1 = origBp1;
+ newBp1 &= unalignedBp1 ? highMask : lowMask;
+ newBp1 |= unalignedBp1 ? lowBreakInst : highBreakInst;
+ if(ptrace(PTRACE_POKETEXT, pid, alignedBp1, newBp1) != 0)
cerr << "Poke failed" << endl;
- //Replace the next word, if necessary
- if(unalignedNPC)
+ /*
+ * Set the second breakpoint if necessary
+ */
+ if(numTargets == 2)
{
- if(ptrace(PTRACE_POKETEXT, pid, alignedNPC+8, newAnnulInst) != 0)
+ origBp2 = ptrace(PTRACE_PEEKTEXT, pid, alignedBp2, 0);
+ uint64_t newBp2 = origBp2;
+ newBp2 &= unalignedBp2 ? highMask : lowMask;
+ newBp2 |= unalignedBp2 ? lowBreakInst : highBreakInst;
+ if(ptrace(PTRACE_POKETEXT, pid, alignedBp2, newBp2) != 0)
cerr << "Poke failed" << endl;
}
update(pid);
/*
- * Put back the original contents of the childs address space
+ * Put back the original contents of the childs address space in the
+ * reverse order.
*/
- if(ptrace(PTRACE_POKETEXT, pid, alignedNPC, originalInst) != 0)
- cerr << "Repoke failed" << endl;
- if(unalignedNPC)
+ if(numTargets == 2)
{
- if(ptrace(PTRACE_POKETEXT, pid, alignedNPC+8, originalAnnulInst) != 0)
- cerr << "Repoke failed" << endl;
+ if(ptrace(PTRACE_POKETEXT, pid, alignedBp2, origBp2) != 0)
+ cerr << "Poke failed" << endl;
}
- return true;
+ if(ptrace(PTRACE_POKETEXT, pid, alignedBp1, origBp1) != 0)
+ cerr << "Poke failed" << endl;
}
int64_t SparcTraceChild::getRegVal(int num)
ostream & SparcTraceChild::outputStartState(ostream & os)
{
+ bool v8 = false;
uint64_t sp = getSP();
+ if(sp % 1)
+ {
+ os << "Detected a 64 bit executable.\n";
+ v8 = false;
+ }
+ else
+ {
+ os << "Detected a 32 bit executable.\n";
+ v8 = true;
+ }
uint64_t pc = getPC();
char obuf[1024];
sprintf(obuf, "Initial stack pointer = 0x%016llx\n", sp);
os << obuf;
sprintf(obuf, "Initial program counter = 0x%016llx\n", pc);
os << obuf;
- //Take out the stack bias
- sp += 2047;
+ if(!v8)
+ {
+ //Take out the stack bias
+ sp += 2047;
+ }
//Output the window save area
for(unsigned int x = 0; x < 16; x++)
{
uint64_t regspot = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
+ if(v8) regspot = regspot >> 32;
sprintf(obuf, "0x%016llx: Window save %d = 0x%016llx\n",
sp, x+1, regspot);
os << obuf;
- sp += 8;
+ sp += v8 ? 4 : 8;
}
//Output the argument count
uint64_t cargc = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
+ if(v8) cargc = cargc >> 32;
sprintf(obuf, "0x%016llx: Argc = 0x%016llx\n", sp, cargc);
os << obuf;
- sp += 8;
+ sp += v8 ? 4 : 8;
//Output argv pointers
int argCount = 0;
uint64_t cargv;
do
{
cargv = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
+ if(v8) cargv = cargv >> 32;
sprintf(obuf, "0x%016llx: argv[%d] = 0x%016llx\n",
sp, argCount++, cargv);
os << obuf;
- sp += 8;
+ sp += v8 ? 4 : 8;
} while(cargv);
//Output the envp pointers
int envCount = 0;
do
{
cenvp = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
+ if(v8) cenvp = cenvp >> 32;
sprintf(obuf, "0x%016llx: envp[%d] = 0x%016llx\n",
sp, envCount++, cenvp);
os << obuf;
- sp += 8;
+ sp += v8 ? 4 : 8;
} while(cenvp);
uint64_t auxType, auxVal;
do
{
auxType = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
- sp += 8;
+ if(v8) auxType = auxType >> 32;
+ sp += (v8 ? 4 : 8);
auxVal = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
- sp += 8;
+ if(v8) auxVal = auxVal >> 32;
+ sp += (v8 ? 4 : 8);
sprintf(obuf, "0x%016llx: Auxiliary vector = {0x%016llx, 0x%016llx}\n",
- sp - 16, auxType, auxVal);
+ sp - 8, auxType, auxVal);
os << obuf;
} while(auxType != 0 || auxVal != 0);
//Print out the argument strings, environment strings, and file name.
{
buf = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
char * cbuf = (char *)&buf;
- for(int x = 0; x < sizeof(uint64_t); x++)
+ for(int x = 0; x < sizeof(uint32_t); x++)
{
if(cbuf[x])
current += cbuf[x];
currentStart = sp + x + 1;
}
}
- sp += 8;
+ sp += (v8 ? 4 : 8);
clearedInitialPadding = clearedInitialPadding || buf != 0;
} while(!clearedInitialPadding || buf != 0);
return os;
projects / gem5.git / commitdiff