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emitter: Support arbitrary FixupBranch targets.

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This commit is contained in:
bunnei 2016-03-19 15:16:16 -04:00
parent db0db6a182
commit e5d417213c
2 changed files with 17 additions and 0 deletions
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16
src/common/x64/emitter.cpp
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@ -531,6 +531,22 @@ void XEmitter::SetJumpTarget(const FixupBranch& branch)
} }
} }
void XEmitter::SetJumpTarget(const FixupBranch& branch, const u8* target)
{
if (branch.type == 0)
{
s64 distance = (s64)(target - branch.ptr);
ASSERT_MSG(distance >= -0x80 && distance < 0x80, "Jump target too far away, needs force5Bytes = true");
branch.ptr[-1] = (u8)(s8)distance;
}
else if (branch.type == 1)
{
s64 distance = (s64)(target - branch.ptr);
ASSERT_MSG(distance >= -0x80000000LL && distance < 0x80000000LL, "Jump target too far away, needs indirect register");
((s32*)branch.ptr)[-1] = (s32)distance;
}
}
//Single byte opcodes //Single byte opcodes
//There is no PUSHAD/POPAD in 64-bit mode. //There is no PUSHAD/POPAD in 64-bit mode.
void XEmitter::INT3() {Write8(0xCC);} void XEmitter::INT3() {Write8(0xCC);}

1
src/common/x64/emitter.h
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@ -431,6 +431,7 @@ public:
void J_CC(CCFlags conditionCode, const u8* addr, bool force5Bytes = false); void J_CC(CCFlags conditionCode, const u8* addr, bool force5Bytes = false);
void SetJumpTarget(const FixupBranch& branch); void SetJumpTarget(const FixupBranch& branch);
void SetJumpTarget(const FixupBranch& branch, const u8* target);
void SETcc(CCFlags flag, OpArg dest); void SETcc(CCFlags flag, OpArg dest);
// Note: CMOV brings small if any benefit on current cpus. // Note: CMOV brings small if any benefit on current cpus.