death_after_heal_fix.ccs

// This patch is public domain, "as-is" with no warranty
// See https://unlicense.org/
// Author: cooprocks123e, 2021-05-17

import asm65816

// Patch battle routine to avoid killing players
// with displayed HP of 0 when it is rolling up

ROM[0xc2bb74] = {
    LDX_d(0x02)                             // 74: Load character struct pointer into X
    LDA_x(0x004b)                           // 76: Load PP from character struct
    STA_y(0x9fc3)                           // 79: Store to battler struct PP
    LDA_x(0x0045)                           // 7c: Load HP from character struct
    STA_y(0x9fbd)                           // 7f: Store to battler struct HP
    BNE(0x71)      // 0xc2bbf5-0xc2bb84     // 82: Branch forward to UNKNOWN4 if HP is not zero
    LDA_x(0x0047)                           // 84: Load target HP from character struct
    BNE(0x6c)      // 0xc2bbf5-0xc2bb89     // 87: Branch forward to UNKNOWN4 if target HP is not zero
    BRA(0x02)      // 0xc2bb8d-0xc2bb8b     // 89: Branch past NOPs (avoid wasting cycles)
    NOP()                                   // 8b: \  NOP padding
    NOP()                                   // 8c: /
    // PC should now be 0xc2bb8d
    // UNKNOWN4 = 0xc2bbf5
}