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Stack-free IWRAM clear

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This commit is contained in:
PikalaxALT 2019-07-07 21:07:30 -04:00
parent 8d224bf941
commit 7fd327d632
1 changed files with 14 additions and 1 deletions
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15
src/main.c
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@ -89,7 +89,20 @@ void AgbMain()
// Modern compilers are liberal with the stack on entry to this function,
// so RegisterRamReset may crash if it resets IWRAM.
RegisterRamReset(RESET_ALL & ~RESET_IWRAM);
DmaFill32(3, 0, IWRAM_START, 0x7E00);
asm("mov\tr1, #0xC0\n"
"\tlsl\tr1, r1, #0x12\n"
"\tmov r2, #0xFC\n"
"\tlsl r2, r2, #0x7\n"
"\tadd\tr2, r1, r2\n"
"\tmov\tr0, #0\n"
"\tmov\tr3, r0\n"
"\tmov\tr4, r0\n"
"\tmov\tr5, r0\n"
".LCU0:\n"
"\tstmia r1!, {r0, r3, r4, r5}\n"
"\tcmp\tr1, r2\n"
"\tbcc\t.LCU0\n"
);
#else
RegisterRamReset(RESET_ALL);
#endif //MODERN