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Avoid trying to decode the raw inline constant which is part of the aged code prologue.

Browse Source 
BUG=v8:3007
LOG=N
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/88303003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18097 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
rmcilroy@chromium.org 2013-11-27 10:07:57 +00:00
parent 525876350d
commit 49627050d0
2 changed files with 11 additions and 0 deletions
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3
src/arm/constants-arm.h
View File

@ -50,6 +50,9 @@ inline int DecodeConstantPoolLength(int instr) {
return ((instr >> 4) & 0xfff0) | (instr & 0xf);
}
// Used in code age prologue - ldr(pc, MemOperand(pc, -4))
const int kCodeAgeJumpInstruction = 0xe51ff004;
// Number of registers in normal ARM mode.
const int kNumRegisters = 16;

8
src/arm/disasm-arm.cc
View File

@ -1679,6 +1679,14 @@ int Decoder::InstructionDecode(byte* instr_ptr) {
"constant pool begin (length %d)",
DecodeConstantPoolLength(instruction_bits));
return Instruction::kInstrSize;
} else if (instruction_bits == kCodeAgeJumpInstruction) {
// The code age prologue has a constant immediatly following the jump
// instruction.
Instruction* target = Instruction::At(instr_ptr + Instruction::kInstrSize);
DecodeType2(instr);
OS::SNPrintF(out_buffer_ + out_buffer_pos_,
" (0x%08x)", target->InstructionBits());
return 2 * Instruction::kInstrSize;
}
switch (instr->TypeValue()) {
case 0: