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Merge pull request #5260 from MerryMage/CheckIfSafeAddress

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EmuCodeBlock: Make CheckIfSafeAddress PIE-compliant
This commit is contained in:
Markus Wick 2017-04-15 13:26:05 +02:00 committed by GitHub
commit a389ae0711
1 changed files with 14 additions and 17 deletions
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31
Source/Core/Core/PowerPC/Jit64Common/EmuCodeBlock.cpp
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@ -89,27 +89,24 @@ FixupBranch EmuCodeBlock::CheckIfSafeAddress(const OpArg& reg_value, X64Reg reg_
if (reg_value.IsSimpleReg())
registers_in_use[reg_value.GetSimpleReg()] = true;
// Get ourselves a free register; try to pick one that doesn't involve pushing, if we can.
X64Reg scratch = RSCRATCH;
if (!registers_in_use[RSCRATCH])
scratch = RSCRATCH;
else if (!registers_in_use[RSCRATCH_EXTRA])
scratch = RSCRATCH_EXTRA;
else
scratch = reg_addr;
// Get ourselves two free registers
if (registers_in_use[RSCRATCH])
PUSH(RSCRATCH);
if (registers_in_use[RSCRATCH_EXTRA])
PUSH(RSCRATCH_EXTRA);
if (scratch == reg_addr)
PUSH(scratch);
else
MOV(32, R(scratch), R(reg_addr));
if (reg_addr != RSCRATCH_EXTRA)
MOV(32, R(RSCRATCH_EXTRA), R(reg_addr));
// Perform lookup to see if we can use fast path.
SHR(32, R(scratch), Imm8(PowerPC::BAT_INDEX_SHIFT));
TEST(32, MScaled(scratch, SCALE_4, PtrOffset(&PowerPC::dbat_table[0])),
Imm32(PowerPC::BAT_PHYSICAL_BIT));
MOV(64, R(RSCRATCH), ImmPtr(&PowerPC::dbat_table[0]));
SHR(32, R(RSCRATCH_EXTRA), Imm8(PowerPC::BAT_INDEX_SHIFT));
TEST(32, MComplex(RSCRATCH, RSCRATCH_EXTRA, SCALE_4, 0), Imm32(PowerPC::BAT_PHYSICAL_BIT));
if (scratch == reg_addr)
POP(scratch);
if (registers_in_use[RSCRATCH_EXTRA])
POP(RSCRATCH_EXTRA);
if (registers_in_use[RSCRATCH])
POP(RSCRATCH);
return J_CC(CC_Z, m_far_code.Enabled());
}