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aarch64: Correctly implement the null function trap

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kd-11 2024-09-25 05:31:48 +03:00 committed by kd-11
parent c1d43aff05
commit 82f97d33d1
1 changed files with 10 additions and 7 deletions
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17
Utilities/JITLLVM.cpp
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@ -110,18 +110,21 @@ static u64 make_null_function(const std::string& name)
c.align(AlignMode::kData, 16);
#else
// AArch64 implementation
Label jmp_address = c.newLabel();
Label data = c.newLabel();
// Force absolute jump to prevent out of bounds PC-rel jmp
c.ldr(args[0], arm::ptr(jmp_address));
c.br(args[0]);
c.align(AlignMode::kCode, 16);
Label jump_address = c.newLabel();
c.ldr(args[0], arm::ptr(data, 0));
c.ldr(a64::x14, arm::ptr(jump_address, 0));
c.br(a64::x14);
// Data frame
c.align(AlignMode::kCode, 16);
c.bind(jump_address);
c.embedUInt64(reinterpret_cast<u64>(&null));
c.align(AlignMode::kData, 16);
c.bind(data);
c.embed(name.c_str(), name.size());
c.embedUInt8(0U);
c.bind(jmp_address);
c.embedUInt64(reinterpret_cast<u64>(&null));
c.align(AlignMode::kData, 16);
#endif
});