Read the code your money trusts.

01mov64 r6, r5
02mov64 r9, r4
03mov64 r8, r3
04mov64 r7, r2
05stxdw [r10-2160], r1
06lddw r1, 0x1acd30  ; "Instruction: Buy"
07mov64 r2, 0x10
08call sol_log_
09ldxdw r1, [r6-4088]
10jlt r1, 0x8, +35   ; -> 24882
11mov64 r2, r1
12and64 r2, -0x8
13jeq r2, 0x8, +32   ; -> 24882
14ldxdw r2, [r6-4096]
15ldxdw r3, [r2+0]
16ldxdw r4, [r2+8]
17jne r1, 0x10, +51   ; -> 24899
18mov64 r6, 0x0
19mov64 r5, 0x0
20stxdw [r10-2184], r5
21stxdw [r10-2176], r4
22stxdw [r10-2168], r3

01pub fn buy(ctx, amount: u64, max_sol_cost: u64, track_volume: OptionBool, cap_to_reserves: bool /* not in IDL */) -> Result<()> {
02    msg!("Instruction: Buy");
03    buy_try_accounts(ctx)?;                                   // fn_2cd81: PDAs, owners, ATAs, signer(user)
04    ensure_bonding_curve_size(bonding_curve, 166)?;           // fn_076ea: realloc old curves, user pays rent
05    check_fee_recipient(global, bonding_curve, fee_recipient)?; // fn_078ef, err 6000 NotAuthorized
06    let buyback_recipient = load_buyback_recipient(remaining_accounts, 1, global)?; // err 6062 if missing
07    require!(!bonding_curve.complete, BondingCurveComplete);   // 6005, pc 2891b
08    let mut amount = amount;
09    if cap_to_reserves { amount = min(amount, bonding_curve.real_token_reserves); }  // pc 28921
10    require!(amount != 0, 6020 /*zero amount*/);                // pc 28924
11    require!(amount <= bonding_curve.real_token_reserves, 6021 /*NotEnoughTokensToBuy*/);
12    require!(amount < bonding_curve.virtual_token_reserves, Overflow /*6024/6026*/);
13    let sol_cost = amount * virtual_sol_reserves / (virtual_token_reserves - amount) + 1;   // floor + 1
14    let creator_bps = if global.flag_1086 && curve.creator_bps_override != 0 { override } else { creator_bps };
15    let mut protocol_fee = ceil(sol_cost * protocol_bps / 10_000);
16    let mut creator_fee  = if bonding_curve.creator != Pubkey::default() { ceil(sol_cost * creator_bps / 10_000) } else { 0 };
17    if user.key == global.whitelist_pda {                      // pc 289ef: fee-exempt address
18        protocol_fee = 0; creator_fee = 0; protocol_bps = 0; creator_bps = 0;
19    }
20    let total = sol_cost.checked_add(protocol_fee)?.checked_add(creator_fee)?;
21    require!(total <= max_sol_cost, TooMuchSolRequired /*6002*/);   // pc 28a16 (slippage)
22    bonding_curve.virtual_token_reserves -= amount;