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Match and document DebugMenu_8077C3C (now DebugMenu_ConvertBuildDate)

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It seems that simply putting an asm("") matched 8077C3C.
This commit is contained in:
easyaspi314 (Devin)
2019-08-24 23:17:06 -04:00
parent 265fd20253
commit 1c0ccca5a2
1 changed files with 35 additions and 128 deletions
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163
src/debug/start_menu_debug.c
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@@ -344,7 +344,15 @@ extern const u8 Str_839BD2C[];
extern const u8 Str_839BD4C[];
static u8 gUnknown_030006B8;
UNUSED static const s32 * gUnknown_030006BC;
struct DebugBuildDateInfo {
s32 max;
s32 digitMultiplier;
s32 numDigits;
s32 offset;
};
static const struct DebugBuildDateInfo *gDebugBuildDate;
static u8 gUnknown_030006C0;
static u8 gUnknown_030006C1;
static const u8 * gUnknown_030006C4;
@@ -1380,144 +1388,43 @@ u8 DebugMenu_8077C14(void)
const u8 Str_839BFDC[] = DTR("　じかん　ふん　びょう", " HOURS MINUTES SECONDS");
const s32 gUnknown_Debug_839BFE8[] = {
99, 10, 2, 23,
99, 10, 2, 26
static const struct DebugBuildDateInfo gDebugBuildDateInfo[] = {
{ 99, 10, 2, 23 },
{ 99, 10, 2, 26 }
};
#ifdef NONMATCHING
void DebugMenu_8077C3C(const char * a0, u8 * a1)
// Parses the version code in a highly inefficient and unsafe way.
void DebugMenu_ConvertBuildDate(const char *buildDateStr, u8 *out)
{
// Register allocation swap
// Intended: r7 = a1, r6 = gUnknown_030006BC[2]
// Observed: r6 = a1, r7 = gUnknown_030006BC[2]
int i;
// Prevents register allocation swap
// Intended: r7 = out, r6 = gDebugBuildDate->numDigits
// Observed: r6 = out, r7 = gDebugBuildDate->numDigits
asm("");
gUnknown_030006BC = gUnknown_Debug_839BFE8;
*a1++ = CHAR_SPACE;
*a1++ = CHAR_SPACE;
for (i = 0; i < 2; i++, gUnknown_030006BC += 4)
gDebugBuildDate = gDebugBuildDateInfo;
*out++ = CHAR_SPACE;
*out++ = CHAR_SPACE;
for (i = 0; i < 2; i++, gDebugBuildDate++)
{
u32 r5 = 0;
int r2;
int r4;
for (r2 = gUnknown_030006BC[1], r4 = 0; r4 < gUnknown_030006BC[2]; r4++, r2 /= 10)
r5 += (a0[gUnknown_030006BC[3] + r4] - '0') * r2;
if (gUnknown_030006BC[0] < r5)
r5 = gUnknown_030006BC[0];
a1 = ConvertIntToDecimalStringN(a1, r5, STR_CONV_MODE_LEADING_ZEROS, gUnknown_030006BC[2]);
int j;
int mul;
u32 date = 0;
for (mul = gDebugBuildDate->digitMultiplier, j = 0; j < gDebugBuildDate->numDigits; j++, mul /= 10)
date += (buildDateStr[gDebugBuildDate->offset + j] - '0') * mul;
if (gDebugBuildDate->max < date)
date = gDebugBuildDate->max;
out = ConvertIntToDecimalStringN(out, date, STR_CONV_MODE_LEADING_ZEROS, gDebugBuildDate->numDigits);
}
a1[0] = a0[29] - 'A' + CHAR_A;
if (a1[0] > 0xf6)
a1[0] = 0xf6;
a1[1] = EOS;
out[0] = buildDateStr[29] - 'A' + CHAR_A;
if (out[0] > 0xf6) // prevent special characters
out[0] = 0xf6;
out[1] = EOS;
}
#else
NAKED void DebugMenu_8077C3C(const char * a0, u8 * a1)
{
asm("\tpush\t{r4, r5, r6, r7, lr}\n"
"\tmov\tr7, sl\n"
"\tmov\tr6, r9\n"
"\tmov\tr5, r8\n"
"\tpush\t{r5, r6, r7}\n"
"\tadd\tsp, sp, #0xfffffffc\n"
"\tmov\tsl, r0\n"
"\tadd\tr7, r1, #0\n"
"\tldr\tr0, ._271 @ gUnknown_030006BC\n"
"\tldr\tr1, ._271 + 4 @ gUnknown_Debug_839BFE8\n"
"\tstr\tr1, [r0]\n"
"\tmov\tr1, #0x0\n"
"\tstrb\tr1, [r7]\n"
"\tadd\tr7, r7, #0x1\n"
"\tstrb\tr1, [r7]\n"
"\tadd\tr7, r7, #0x1\n"
"\tmov\tr3, #0x0\n"
"\tmov\tr8, r0\n"
"._269:\n"
"\tmov\tr5, #0x0\n"
"\tldr\tr1, ._271 @ gUnknown_030006BC\n"
"\tldr\tr0, [r1]\n"
"\tldr\tr2, [r0, #0x4]\n"
"\tmov\tr4, #0x0\n"
"\tldr\tr1, [r0, #0x8]\n"
"\tadd\tr3, r3, #0x1\n"
"\tmov\tr9, r3\n"
"\tcmp\tr5, r1\n"
"\tbge\t._266\t@cond_branch\n"
"\tadd\tr3, r0, #0\n"
"\tadd\tr6, r1, #0\n"
"._267:\n"
"\tldr\tr0, [r3, #0xc]\n"
"\tadd\tr0, r0, r4\n"
"\tadd r0, r0, sl\n"
"\tldrb\tr0, [r0]\n"
"\tsub\tr0, r0, #0x30\n"
"\tmul\tr0, r0, r2\n"
"\tadd\tr5, r5, r0\n"
"\tadd\tr4, r4, #0x1\n"
"\tadd\tr0, r2, #0\n"
"\tmov\tr1, #0xa\n"
"\tstr\tr3, [sp]\n"
"\tbl\t__divsi3\n"
"\tadd\tr2, r0, #0\n"
"\tldr\tr3, [sp]\n"
"\tcmp\tr4, r6\n"
"\tblt\t._267\t@cond_branch\n"
"._266:\n"
"\tmov\tr0, r8\n"
"\tldr\tr1, [r0]\n"
"\tldr\tr0, [r1]\n"
"\tcmp\tr0, r5\n"
"\tbcs\t._268\t@cond_branch\n"
"\tadd\tr5, r0, #0\n"
"._268:\n"
"\tldrb\tr3, [r1, #0x8]\n"
"\tadd\tr0, r7, #0\n"
"\tadd\tr1, r5, #0\n"
"\tmov\tr2, #0x2\n"
"\tbl\tConvertIntToDecimalStringN\n"
"\tadd\tr7, r0, #0\n"
"\tmov\tr3, r9\n"
"\tmov\tr1, r8\n"
"\tldr\tr0, [r1]\n"
"\tadd\tr0, r0, #0x10\n"
"\tstr\tr0, [r1]\n"
"\tcmp\tr3, #0x1\n"
"\tble\t._269\t@cond_branch\n"
"\tmov\tr1, sl\n"
"\tldrb\tr0, [r1, #0x1d]\n"
"\tadd\tr0, r0, #0x7a\n"
"\tstrb\tr0, [r7]\n"
"\tlsl\tr0, r0, #0x18\n"
"\tlsr\tr0, r0, #0x18\n"
"\tcmp\tr0, #0xf6\n"
"\tbls\t._270\t@cond_branch\n"
"\tmov\tr0, #0xf6\n"
"\tstrb\tr0, [r7]\n"
"._270:\n"
"\tmov\tr0, #0xff\n"
"\tstrb\tr0, [r7, #0x1]\n"
"\tadd\tsp, sp, #0x4\n"
"\tpop\t{r3, r4, r5}\n"
"\tmov\tr8, r3\n"
"\tmov\tr9, r4\n"
"\tmov\tsl, r5\n"
"\tpop\t{r4, r5, r6, r7}\n"
"\tpop\t{r0}\n"
"\tbx\tr0\n"
"._272:\n"
"\t.align\t2, 0\n"
"._271:\n"
"\t.word\tgUnknown_030006BC \n"
"\t.word\tgUnknown_Debug_839BFE8\n");
}
#endif
void debug_sub_8077CF4(u8 x, u8 y)
{
DebugMenu_8077C3C(BuildDateTime, gStringVar4);
DebugMenu_ConvertBuildDate(BuildDateTime, gStringVar4);
Menu_PrintText(gStringVar4, x, y);
}