Function buildBreak

src/e9patch/e9trampoline.cpp:171–197

    BUILD_BYTES,    // Build bytes (buf != nullptr)
};
static int buildBreak(const Binary *B, const Instr *I, intptr_t addr,
    BuildMode mode = BUILD_SIZE, const BreakInfo *breaks = nullptr,
    Buffer *buf = nullptr)
{
    if (mode == BUILD_SIZE)
        return /*sizeof(jmpq)=*/5;

    intptr_t target = I->addr + I->size;
    if (breaks != nullptr)
    {
        auto i = breaks->find(I->addr);
        if (i != breaks->end())
            target = i->second;
    }
    off_t rel = target - (addr + /*sizeof(jmpq)=*/5);
    assert(rel >= INT32_MIN && rel <= INT32_MAX);
    int32_t rel32 = (int32_t)rel;
    uint8_t *bytes = buf->bytes();
    buf->push(/*jmpq opcode=*/0xE9);
    buf->push((const uint8_t *)&rel32, sizeof(rel32));

    const Instr *J = I->succ();
    if (option_Opeephole && J != nullptr && buf->bytes() != nullptr)
        saveJump(B, addr, bytes, /*sizeof(jmpq)=*/5);
 
    return /*sizeof(jmpq)=*/5;
}

/*
 * Build a $break/$BREAK operation from a trampoline back to the main code.