Aren/rulimine
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Dehook int 0x08 when unused

Browse Source
This commit is contained in:
mintsuki 2020-04-29 17:16:11 +02:00
parent f8c0b317aa
commit 8e7ce7a105
2 changed files with 10 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
qloader2.bin
View File

Binary file not shown.

23
src/lib/blib.c
View File

@ -63,14 +63,21 @@ __attribute__((naked)) static void int_08_isr(void) {
uint32_t *ivt = 0; // this variable is not static else gcc will optimise the
// 0 ptr to a ud2
static void hook_int_08(void) {
__attribute__((used)) static void hook_int_08(void) {
ivt[0x40] = ivt[0x08]; // int 0x40 is callback interrupt
ivt[0x08] = rm_seg(int_08_isr) << 16 | rm_off(int_08_isr);
}
__attribute__((used)) static void dehook_int_08(void) {
ivt[0x08] = ivt[0x40];
}
// This is a dirty hack but we need to execute this full function in real mode
__attribute__((naked)) int _pit_sleep_and_quit_on_keypress(uint32_t ticks) {
__attribute__((naked))
int pit_sleep_and_quit_on_keypress(uint32_t ticks) {
asm (
"call hook_int_08\n\t"
// pit_ticks in edx
"mov edx, dword ptr ss:[esp+4]\n\t"
@ -151,22 +158,12 @@ __attribute__((naked)) int _pit_sleep_and_quit_on_keypress(uint32_t ticks) {
"pop ebx\n\t"
// Exit
"call dehook_int_08\n\t"
"ret\n\t"
);
(void)ticks;
}
static bool int_08_hooked = false;
int pit_sleep_and_quit_on_keypress(uint32_t ticks) {
if (!int_08_hooked) {
hook_int_08();
int_08_hooked = true;
}
return _pit_sleep_and_quit_on_keypress(ticks);
}
uint64_t strtoui(const char *s) {
uint64_t n = 0;
while (*s)