// A1 regression: pre-fix, malloc bumped the bank-0 phantom heap window
// [__bss_end, 0xBF00) into GNO's kernel heartbeat block (alarmHB ~0xB7xx)
// -> SysFailMgr $0308 halt.  crt0Gno now backs malloc with an MM-owned
// handle (__heapInitMM), so several KB of allocations survive intact.
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

int main(void) {
    *(volatile uint16_t *)0x025010UL = 0xBEEF;          // main entered
    uint16_t ok = 1;
    char    *b[8];
    uint8_t  i;
    for (i = 0; i < 8; i++) {
        b[i] = (char *)malloc(0x400);                   // 8 KB total
        if (!b[i]) {
            ok = 0;
            break;
        }
        memset(b[i], (char)(0xA0 + i), 0x400);
    }
    if (ok) {
        for (i = 0; i < 8; i++) {
            if ((uint8_t)b[i][0] != (uint8_t)(0xA0 + i) ||
                (uint8_t)b[i][0x3FF] != (uint8_t)(0xA0 + i)) {
                ok = 0;
                break;
            }
        }
    }
    // The observable regression signal is survival: pre-fix, malloc bumped
    // into GNO's kernel heartbeat block and 8 KB of allocations could not
    // complete intact.  (A bank read cannot prove MM-ownership -- NewHandle
    // uses attr without attrBank, so the MM may legitimately place the block
    // in bank 0 -- so this probe asserts survival, not the block's bank.)
    *(volatile uint16_t *)0x025012UL = ok ? 0x0001 : 0xDEAD;
    *(volatile uint16_t *)0x025000UL = 0xC0DE;          // reached end
    for (volatile unsigned long j = 0; j < 600000UL; j++) {
    }
    return 0;
}