summaryrefslogtreecommitdiffstats
path: root/js/src/jit/mips32/Assembler-mips32.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'js/src/jit/mips32/Assembler-mips32.cpp')
-rw-r--r--js/src/jit/mips32/Assembler-mips32.cpp101
1 files changed, 25 insertions, 76 deletions
diff --git a/js/src/jit/mips32/Assembler-mips32.cpp b/js/src/jit/mips32/Assembler-mips32.cpp
index 1b86e9d32..461f8d813 100644
--- a/js/src/jit/mips32/Assembler-mips32.cpp
+++ b/js/src/jit/mips32/Assembler-mips32.cpp
@@ -120,8 +120,11 @@ js::jit::SA(FloatRegister r)
void
jit::PatchJump(CodeLocationJump& jump_, CodeLocationLabel label, ReprotectCode reprotect)
{
- Instruction* inst1 = (Instruction*)jump_.raw();
- Instruction* inst2 = inst1->next();
+ Instruction* inst1;
+ Instruction* inst2;
+
+ inst1 = AssemblerMIPSShared::GetInstructionImmediateFromJump((Instruction*)jump_.raw());
+ inst2 = inst1->next();
MaybeAutoWritableJitCode awjc(inst1, 8, reprotect);
AssemblerMIPSShared::UpdateLuiOriValue(inst1, inst2, (uint32_t)label.raw());
@@ -157,23 +160,6 @@ jit::PatchBackedge(CodeLocationJump& jump, CodeLocationLabel label,
}
}
-void
-Assembler::executableCopy(uint8_t* buffer)
-{
- MOZ_ASSERT(isFinished);
- m_buffer.executableCopy(buffer);
-
- // Patch all long jumps during code copy.
- for (size_t i = 0; i < longJumps_.length(); i++) {
- Instruction* inst1 = (Instruction*) ((uint32_t)buffer + longJumps_[i]);
-
- uint32_t value = Assembler::ExtractLuiOriValue(inst1, inst1->next());
- AssemblerMIPSShared::UpdateLuiOriValue(inst1, inst1->next(), (uint32_t)buffer + value);
- }
-
- AutoFlushICache::setRange(uintptr_t(buffer), m_buffer.size());
-}
-
uintptr_t
Assembler::GetPointer(uint8_t* instPtr)
{
@@ -314,8 +300,12 @@ void
Assembler::bind(InstImm* inst, uintptr_t branch, uintptr_t target)
{
int32_t offset = target - branch;
- InstImm inst_bgezal = InstImm(op_regimm, zero, rt_bgezal, BOffImm16(0));
- InstImm inst_beq = InstImm(op_beq, zero, zero, BOffImm16(0));
+
+ // Generate the patchable mixed jump for call.
+ if (inst->extractOpcode() == ((uint32_t)op_jal >> OpcodeShift)) {
+ addMixedJump(BufferOffset(branch), ImmPtr((void*)target));
+ return;
+ }
// If encoded offset is 4, then the jump must be short
if (BOffImm16(inst[0]).decode() == 4) {
@@ -325,46 +315,13 @@ Assembler::bind(InstImm* inst, uintptr_t branch, uintptr_t target)
return;
}
- // Generate the long jump for calls because return address has to be the
- // address after the reserved block.
- if (inst[0].encode() == inst_bgezal.encode()) {
- addLongJump(BufferOffset(branch));
- Assembler::WriteLuiOriInstructions(inst, &inst[1], ScratchRegister, target);
- inst[2] = InstReg(op_special, ScratchRegister, zero, ra, ff_jalr).encode();
- // There is 1 nop after this.
- return;
- }
-
if (BOffImm16::IsInRange(offset)) {
- bool conditional = (inst[0].encode() != inst_bgezal.encode() &&
- inst[0].encode() != inst_beq.encode());
-
inst[0].setBOffImm16(BOffImm16(offset));
inst[1].makeNop();
-
- // Skip the trailing nops in conditional branches.
- if (conditional) {
- inst[2] = InstImm(op_regimm, zero, rt_bgez, BOffImm16(3 * sizeof(void*))).encode();
- // There are 2 nops after this
- }
return;
}
- if (inst[0].encode() == inst_beq.encode()) {
- // Handle long unconditional jump.
- addLongJump(BufferOffset(branch));
- Assembler::WriteLuiOriInstructions(inst, &inst[1], ScratchRegister, target);
- inst[2] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
- // There is 1 nop after this.
- } else {
- // Handle long conditional jump.
- inst[0] = invertBranch(inst[0], BOffImm16(5 * sizeof(void*)));
- // No need for a "nop" here because we can clobber scratch.
- addLongJump(BufferOffset(branch + sizeof(void*)));
- Assembler::WriteLuiOriInstructions(&inst[1], &inst[2], ScratchRegister, target);
- inst[3] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
- // There is 1 nop after this.
- }
+ addMixedJump(BufferOffset(branch), ImmPtr((const void*)target));
}
void
@@ -379,19 +336,16 @@ Assembler::bind(RepatchLabel* label)
InstImm inst_beq = InstImm(op_beq, zero, zero, BOffImm16(0));
uint32_t offset = dest.getOffset() - label->offset();
- // If first instruction is lui, then this is a long jump.
+ // If first instruction is j, then this is a mixed jump.
// If second instruction is lui, then this is a loop backedge.
- if (inst[0].extractOpcode() == (uint32_t(op_lui) >> OpcodeShift)) {
- // For unconditional long branches generated by ma_liPatchable,
- // such as under:
- // jumpWithpatch
- AssemblerMIPSShared::UpdateLuiOriValue(inst, inst->next(), dest.getOffset());
+ if (inst[0].extractOpcode() == (uint32_t(op_j) >> OpcodeShift)) {
+ // For unconditional long branches generated by jumpWithPatch
+ addMixedJump(b, ImmPtr((void*)dest.getOffset()), MixedJumpPatch::PATCHABLE);
} else if (inst[1].extractOpcode() == (uint32_t(op_lui) >> OpcodeShift) ||
BOffImm16::IsInRange(offset))
{
// Handle code produced by:
// backedgeJump
- // branchWithCode
MOZ_ASSERT(BOffImm16::IsInRange(offset));
MOZ_ASSERT(inst[0].extractOpcode() == (uint32_t(op_beq) >> OpcodeShift) ||
inst[0].extractOpcode() == (uint32_t(op_bne) >> OpcodeShift) ||
@@ -399,30 +353,25 @@ Assembler::bind(RepatchLabel* label)
inst[0].extractOpcode() == (uint32_t(op_bgtz) >> OpcodeShift));
inst[0].setBOffImm16(BOffImm16(offset));
} else if (inst[0].encode() == inst_beq.encode()) {
- // Handle open long unconditional jumps created by
+ // Handle open mixed unconditional jumps created by
// MacroAssemblerMIPSShared::ma_b(..., wasm::Trap, ...).
- // We need to add it to long jumps array here.
+ // We need to add it to mixed jumps array here.
// See MacroAssemblerMIPS::branchWithCode().
MOZ_ASSERT(inst[1].encode() == NopInst);
- MOZ_ASSERT(inst[2].encode() == NopInst);
- MOZ_ASSERT(inst[3].encode() == NopInst);
- addLongJump(BufferOffset(label->offset()));
- Assembler::WriteLuiOriInstructions(inst, &inst[1], ScratchRegister, dest.getOffset());
- inst[2] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
+ addMixedJump(b, ImmPtr((void*)dest.getOffset()), MixedJumpPatch::PATCHABLE);
+ inst[0] = InstJump(op_j, JOffImm26(0)).encode();
} else {
- // Handle open long conditional jumps created by
+ // Handle open mixed conditional jumps created by
// MacroAssemblerMIPSShared::ma_b(..., wasm::Trap, ...).
- inst[0] = invertBranch(inst[0], BOffImm16(5 * sizeof(void*)));
+ inst[0] = invertBranch(inst[0], BOffImm16(4 * sizeof(void*)));
// No need for a "nop" here because we can clobber scratch.
- // We need to add it to long jumps array here.
+ // We need to add it to mixed jumps array here.
// See MacroAssemblerMIPS::branchWithCode().
MOZ_ASSERT(inst[1].encode() == NopInst);
MOZ_ASSERT(inst[2].encode() == NopInst);
MOZ_ASSERT(inst[3].encode() == NopInst);
- MOZ_ASSERT(inst[4].encode() == NopInst);
- addLongJump(BufferOffset(label->offset() + sizeof(void*)));
- Assembler::WriteLuiOriInstructions(&inst[1], &inst[2], ScratchRegister, dest.getOffset());
- inst[3] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
+ addMixedJump(b, ImmPtr((void*)dest.getOffset()), MixedJumpPatch::PATCHABLE);
+ inst[2] = InstJump(op_j, JOffImm26(0)).encode();
}
}
label->bind(dest.getOffset());