is_debug.c

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#include "common.h"
#include "stdlib/stdarg.h"
#include "nu/nusys.h"
 
void crash_screen_set_assert_info(const char* message);
typedef struct {
    /* 0x00 */ u32 magic;
    /* 0x04 */ u32 get;
    /* 0x08 */ char unk_08[0x14-0x08];
    /* 0x14 */ u32 put;
    /* 0x18 */ char unk_18[0x20-0x18];
    /* 0x20 */ char data[0x10000-0x20];
} ISVDbg;
 
#define gISVDbgPrnAdrs ((ISVDbg*) 0xb3ff0000)
 
char* is_debug_print(char* arg0, const char* str, size_t count);
 
void is_debug_init(void) {
    osEPiWriteIo(nuPiCartHandle, (u32) &gISVDbgPrnAdrs->put, 0);
    osEPiWriteIo(nuPiCartHandle, (u32) &gISVDbgPrnAdrs->get, 0);
    osEPiWriteIo(nuPiCartHandle, (u32) &gISVDbgPrnAdrs->magic, ASCII_TO_U32('I', 'S', '6', '4'));
}
 
void printf(const char* fmt, ...) {
    va_list args;
    va_start(args, fmt);
 
    _Printf(is_debug_print, NULL, fmt, args);
}
 
void osSyncPrintf(const char* fmt, ...) {
    va_list args;
    va_start(args, fmt);
 
    _Printf(is_debug_print, NULL, fmt, args);
}
 
void rmonPrintf(const char* fmt, ...) {
    va_list args;
    va_start(args, fmt);
 
    _Printf(is_debug_print, NULL, fmt, args);
}
 
char* is_debug_print(char* arg0, const char* str, size_t count) {
    u32 data;
    s32 pos;
    s32 start;
    s32 end;
 
    osEPiReadIo(nuPiCartHandle, (u32) &gISVDbgPrnAdrs->magic, &data);
    if (data != ASCII_TO_U32('I', 'S', '6', '4')) {
        return (char*) 1;
    }
    osEPiReadIo(nuPiCartHandle, (u32) &gISVDbgPrnAdrs->get, &data);
    pos = data;
    osEPiReadIo(nuPiCartHandle, (u32) &gISVDbgPrnAdrs->put, &data);
    start = data;
    end = start + count;
    if (end >= 0xffe0) {
        end -= 0xffe0;
        if (pos < end || start < pos) {
            return (char*) 1;
        }
    } else {
        if (start < pos && pos < end) {
            return (char*) 1;
        }
    }
    while (count) {
        u8 c = *str;
 
        if (c != 0) {
            u32 addr = (u32) &gISVDbgPrnAdrs->data + (start & 0xffffffc);
            s32 shift = ((3 - (start & 3)) * 8);
 
            osEPiReadIo(nuPiCartHandle, addr, &data);
            osEPiWriteIo(nuPiCartHandle, addr, (data & ~(0xff << shift)) | ((u8)*str << shift));
 
            start++;
            if (start >= 0xffe0) {
                start -= 0xffe0;
            }
        }
        count--;
        str++;
    }
    osEPiWriteIo(nuPiCartHandle, (u32)&gISVDbgPrnAdrs->put, start);
    return (char*) 1;
}
 
void is_debug_panic(const char* message) {
    crash_screen_set_assert_info(message);
    *(volatile u32*)0 = 0; // Crash so we can see the crash screen
}