Enable lto and move naked assembly functions to own files
This commit is contained in:
mintsuki
parent
5379787967
commit
ba7ed52f6a
BIN
limine.bin
BIN
limine.bin
Binary file not shown.
10
src/Makefile
10
src/Makefile
|
|
@ -1,7 +1,7 @@
|
|||
CC = ../toolchain/bin/i386-elf-gcc
|
||||
LD = ../toolchain/bin/i386-elf-gcc
|
||||
|
||||
CFLAGS = -Os -pipe -Wall -Wextra
|
||||
CFLAGS = -flto -Os -pipe -Wall -Wextra
|
||||
|
||||
INTERNAL_CFLAGS = \
|
||||
-std=gnu99 \
|
||||
|
|
@ -15,7 +15,7 @@ INTERNAL_CFLAGS = \
|
|||
-I. \
|
||||
-Wno-address-of-packed-member
|
||||
|
||||
LDFLAGS = -O2
|
||||
LDFLAGS = -flto -Os
|
||||
|
||||
INTERNAL_LDFLAGS = \
|
||||
-nostdlib \
|
||||
|
|
@ -27,7 +27,8 @@ INTERNAL_LDFLAGS = \
|
|||
.PHONY: all clean
|
||||
|
||||
C_FILES := $(shell find ./ -type f -name '*.c' | sort)
|
||||
OBJ := $(C_FILES:.c=.o)
|
||||
ASM_FILES := $(shell find ./ -type f -name '*.asm' | grep -v bootsect | sort)
|
||||
OBJ := $(C_FILES:.c=.o) $(ASM_FILES:.asm=.o)
|
||||
|
||||
all: limine.bin
|
||||
|
||||
|
|
@ -38,5 +39,8 @@ limine.bin: $(OBJ)
|
|||
%.o: %.c
|
||||
$(CC) $(CFLAGS) $(INTERNAL_CFLAGS) -c $< -o $@
|
||||
|
||||
%.o: %.asm
|
||||
nasm $< -f elf32 -o $@
|
||||
|
||||
clean:
|
||||
rm -f $(OBJ)
|
||||
|
|
|
|||
121
src/lib/blib.c
121
src/lib/blib.c
|
|
@ -68,127 +68,6 @@ void *balloc_aligned(size_t count, size_t alignment) {
|
|||
return ret;
|
||||
}
|
||||
|
||||
__attribute__((used)) static uint32_t int_08_ticks_counter;
|
||||
|
||||
__attribute__((naked)) static void int_08_isr(void) {
|
||||
ASM_BASIC(
|
||||
".code16\n\t"
|
||||
"inc dword ptr cs:[int_08_ticks_counter]\n\t"
|
||||
"int 0x40\n\t" // call callback
|
||||
"iret\n\t"
|
||||
".code32\n\t"
|
||||
);
|
||||
}
|
||||
|
||||
uint32_t *ivt = 0; // this variable is not static else gcc will optimise the
|
||||
// 0 ptr to a ud2
|
||||
|
||||
__attribute__((used)) static void hook_int_08(void) {
|
||||
ivt[0x40] = ivt[0x08]; // int 0x40 is callback interrupt
|
||||
ivt[0x08] = (uint16_t)(size_t)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) {
|
||||
ASM_BASIC(
|
||||
"call hook_int_08\n\t"
|
||||
|
||||
// pit_ticks in edx
|
||||
"mov edx, dword ptr ss:[esp+4]\n\t"
|
||||
|
||||
"lea ecx, int_08_ticks_counter\n\t"
|
||||
|
||||
"mov dword ptr ds:[ecx], 0\n\t"
|
||||
|
||||
// Save non-scratch GPRs
|
||||
"push ebx\n\t"
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"push ebp\n\t"
|
||||
|
||||
// Jump to real mode
|
||||
FARJMP32("0x08", "1f")
|
||||
"1: .code16\n\t"
|
||||
"mov ax, 0x10\n\t"
|
||||
"mov ds, ax\n\t"
|
||||
"mov es, ax\n\t"
|
||||
"mov fs, ax\n\t"
|
||||
"mov gs, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
"mov eax, cr0\n\t"
|
||||
"and al, 0xfe\n\t"
|
||||
"mov cr0, eax\n\t"
|
||||
FARJMP16("0", "1f")
|
||||
"1:\n\t"
|
||||
"mov ax, 0\n\t"
|
||||
"mov ds, ax\n\t"
|
||||
"mov es, ax\n\t"
|
||||
"mov fs, ax\n\t"
|
||||
"mov gs, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
|
||||
"sti\n\t"
|
||||
|
||||
"10:\n\t"
|
||||
|
||||
"cmp dword ptr ds:[ecx], edx\n\t"
|
||||
"je 30f\n\t" // out on timeout
|
||||
|
||||
"push ecx\n\t"
|
||||
"push edx\n\t"
|
||||
"mov ah, 0x01\n\t"
|
||||
"xor al, al\n\t"
|
||||
"int 0x16\n\t"
|
||||
"pop edx\n\t"
|
||||
"pop ecx\n\t"
|
||||
|
||||
"jz 10b\n\t" // loop
|
||||
|
||||
// on keypress
|
||||
"xor ax, ax\n\t"
|
||||
"int 0x16\n\t"
|
||||
"mov eax, 1\n\t"
|
||||
"jmp 20f\n\t" // out
|
||||
|
||||
"30:\n\t" // out on timeout
|
||||
"xor eax, eax\n\t"
|
||||
|
||||
"20:\n\t"
|
||||
|
||||
"cli\n\t"
|
||||
|
||||
// Jump back to pmode
|
||||
"mov ebx, cr0\n\t"
|
||||
"or bl, 1\n\t"
|
||||
"mov cr0, ebx\n\t"
|
||||
FARJMP16("0x18", "1f")
|
||||
"1: .code32\n\t"
|
||||
"mov bx, 0x20\n\t"
|
||||
"mov ds, bx\n\t"
|
||||
"mov es, bx\n\t"
|
||||
"mov fs, bx\n\t"
|
||||
"mov gs, bx\n\t"
|
||||
"mov ss, bx\n\t"
|
||||
|
||||
// Restore non-scratch GPRs
|
||||
"pop ebp\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"pop ebx\n\t"
|
||||
|
||||
// Exit
|
||||
"push eax\n\t"
|
||||
"call dehook_int_08\n\t"
|
||||
"pop eax\n\t"
|
||||
"ret\n\t"
|
||||
);
|
||||
}
|
||||
|
||||
uint64_t strtoui(const char *s) {
|
||||
uint64_t n = 0;
|
||||
while (*s)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,75 @@
|
|||
section .text
|
||||
|
||||
global memcpy
|
||||
memcpy:
|
||||
push esi
|
||||
push edi
|
||||
mov eax, dword [esp+12]
|
||||
mov edi, eax
|
||||
mov esi, dword [esp+16]
|
||||
mov ecx, dword [esp+20]
|
||||
rep movsb
|
||||
pop edi
|
||||
pop esi
|
||||
ret
|
||||
|
||||
global memset
|
||||
memset:
|
||||
push edi
|
||||
mov edx, dword [esp+8]
|
||||
mov edi, edx
|
||||
mov eax, dword [esp+12]
|
||||
mov ecx, dword [esp+16]
|
||||
rep stosb
|
||||
mov eax, edx
|
||||
pop edi
|
||||
ret
|
||||
|
||||
global memmove
|
||||
memmove:
|
||||
push esi
|
||||
push edi
|
||||
mov eax, dword [esp+12]
|
||||
mov edi, eax
|
||||
mov esi, dword [esp+16]
|
||||
mov ecx, dword [esp+20]
|
||||
|
||||
cmp edi, esi
|
||||
ja .copy_backwards
|
||||
|
||||
rep movsb
|
||||
jmp .done
|
||||
|
||||
.copy_backwards:
|
||||
lea edi, [edi+ecx-1]
|
||||
lea esi, [esi+ecx-1]
|
||||
std
|
||||
rep movsb
|
||||
cld
|
||||
|
||||
.done:
|
||||
pop edi
|
||||
pop esi
|
||||
ret
|
||||
|
||||
global memcmp
|
||||
memcmp:
|
||||
push esi
|
||||
push edi
|
||||
mov edi, dword [esp+12]
|
||||
mov esi, dword [esp+16]
|
||||
mov ecx, dword [esp+20]
|
||||
repe cmpsb
|
||||
jecxz .equal
|
||||
mov al, byte [edi-1]
|
||||
sub al, byte [esi-1]
|
||||
movsx eax, al
|
||||
jmp .done
|
||||
|
||||
.equal:
|
||||
mov eax, ecx
|
||||
|
||||
.done:
|
||||
pop edi
|
||||
pop esi
|
||||
ret
|
||||
|
|
@ -17,90 +17,6 @@ int tolower(int c) {
|
|||
return c;
|
||||
}
|
||||
|
||||
__attribute__((naked))
|
||||
void *memcpy(void *dest, const void *src, size_t n) {
|
||||
ASM_BASIC(
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"mov eax, dword ptr [esp+12]\n\t"
|
||||
"mov edi, eax\n\t"
|
||||
"mov esi, dword ptr [esp+16]\n\t"
|
||||
"mov ecx, dword ptr [esp+20]\n\t"
|
||||
"rep movsb\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"ret\n\t"
|
||||
);
|
||||
}
|
||||
|
||||
__attribute__((naked))
|
||||
void *memset(void *s, int c, size_t n) {
|
||||
ASM_BASIC(
|
||||
"push edi\n\t"
|
||||
"mov edx, dword ptr [esp+8]\n\t"
|
||||
"mov edi, edx\n\t"
|
||||
"mov eax, dword ptr [esp+12]\n\t"
|
||||
"mov ecx, dword ptr [esp+16]\n\t"
|
||||
"rep stosb\n\t"
|
||||
"mov eax, edx\n\t"
|
||||
"pop edi\n\t"
|
||||
"ret\n\t"
|
||||
);
|
||||
}
|
||||
|
||||
__attribute__((naked))
|
||||
void *memmove(void *dest, const void *src, size_t n) {
|
||||
ASM_BASIC(
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"mov eax, dword ptr [esp+12]\n\t"
|
||||
"mov edi, eax\n\t"
|
||||
"mov esi, dword ptr [esp+16]\n\t"
|
||||
"mov ecx, dword ptr [esp+20]\n\t"
|
||||
|
||||
"cmp edi, esi\n\t"
|
||||
"ja 1f\n\t"
|
||||
|
||||
"rep movsb\n\t"
|
||||
"jmp 2f\n\t"
|
||||
|
||||
"1:\n\t"
|
||||
"lea edi, [edi+ecx-1]\n\t"
|
||||
"lea esi, [esi+ecx-1]\n\t"
|
||||
"std\n\t"
|
||||
"rep movsb\n\t"
|
||||
"cld\n\t"
|
||||
|
||||
"2:\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"ret\n\t"
|
||||
);
|
||||
}
|
||||
|
||||
__attribute__((naked))
|
||||
int memcmp(const void *s1, const void *s2, size_t n) {
|
||||
ASM_BASIC(
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"mov edi, dword ptr [esp+12]\n\t"
|
||||
"mov esi, dword ptr [esp+16]\n\t"
|
||||
"mov ecx, dword ptr [esp+20]\n\t"
|
||||
"repe cmpsb\n\t"
|
||||
"jecxz 1f\n\t"
|
||||
"mov al, byte ptr [edi-1]\n\t"
|
||||
"sub al, byte ptr [esi-1]\n\t"
|
||||
"movsx eax, al\n\t"
|
||||
"jmp 2f\n\t"
|
||||
"1:\n\t"
|
||||
"mov eax, ecx\n\t"
|
||||
"2:\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"ret\n\t"
|
||||
);
|
||||
}
|
||||
|
||||
char *strcpy(char *dest, const char *src) {
|
||||
size_t i;
|
||||
|
||||
|
|
|
|||
|
|
@ -93,22 +93,22 @@ struct mbr_entry {
|
|||
} __attribute__((packed));
|
||||
|
||||
static int mbr_get_part(struct part *ret, int drive, int partition) {
|
||||
// Variables.
|
||||
// Check if actually valid mbr
|
||||
uint16_t hint;
|
||||
read(drive, &hint, 444, sizeof(uint16_t));
|
||||
if (hint && hint != 0x5a5a)
|
||||
return INVALID_TABLE;
|
||||
|
||||
struct mbr_entry entry;
|
||||
const size_t entry_address = 0x1be + sizeof(struct mbr_entry) * partition;
|
||||
size_t entry_offset = 0x1be + sizeof(struct mbr_entry) * partition;
|
||||
|
||||
// Read the entry of the MBR.
|
||||
int r;
|
||||
if ((r = read(drive, &entry, entry_address, sizeof(struct mbr_entry)))) {
|
||||
int r = read(drive, &entry, entry_offset, sizeof(struct mbr_entry));
|
||||
if (r)
|
||||
return r;
|
||||
}
|
||||
|
||||
// Check if the partition exists, fail if it doesnt.
|
||||
if (entry.type == 0) {
|
||||
if (entry.type == 0)
|
||||
return NO_PARTITION;
|
||||
}
|
||||
|
||||
// Assign the final fields and return.
|
||||
ret->first_sect = entry.first_sect;
|
||||
ret->sect_count = entry.sect_count;
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -0,0 +1,118 @@
|
|||
section .text
|
||||
|
||||
global rm_int
|
||||
rm_int:
|
||||
; Self-modifying code: int $int_no
|
||||
mov al, byte [esp+4]
|
||||
mov byte [.int_no], al
|
||||
|
||||
; Save out_regs
|
||||
mov eax, dword [esp+8]
|
||||
mov dword [.out_regs], eax
|
||||
|
||||
; Save in_regs
|
||||
mov eax, dword [esp+12]
|
||||
mov dword [.in_regs], eax
|
||||
|
||||
; Save GDT in case BIOS overwrites it
|
||||
sgdt [.gdt]
|
||||
|
||||
; Save non-scratch GPRs
|
||||
push ebx
|
||||
push esi
|
||||
push edi
|
||||
push ebp
|
||||
|
||||
; Jump to real mode
|
||||
jmp 0x08:.bits16
|
||||
.bits16:
|
||||
bits 16
|
||||
mov ax, 0x10
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov fs, ax
|
||||
mov gs, ax
|
||||
mov ss, ax
|
||||
mov eax, cr0
|
||||
and al, 0xfe
|
||||
mov cr0, eax
|
||||
jmp 0x00:.cszero
|
||||
.cszero:
|
||||
xor ax, ax
|
||||
mov ss, ax
|
||||
|
||||
; Load in_regs
|
||||
mov dword [ss:.esp], esp
|
||||
mov esp, dword [ss:.in_regs]
|
||||
pop gs
|
||||
pop fs
|
||||
pop es
|
||||
pop ds
|
||||
popfd
|
||||
pop ebp
|
||||
pop edi
|
||||
pop esi
|
||||
pop edx
|
||||
pop ecx
|
||||
pop ebx
|
||||
pop eax
|
||||
mov esp, dword [ss:.esp]
|
||||
|
||||
sti
|
||||
|
||||
; Indirect interrupt call
|
||||
db 0xcd
|
||||
.int_no:
|
||||
db 0
|
||||
|
||||
cli
|
||||
|
||||
; Load out_regs
|
||||
mov dword [ss:.esp], esp
|
||||
mov esp, dword [ss:.out_regs]
|
||||
lea esp, [esp + 10*4]
|
||||
push eax
|
||||
push ebx
|
||||
push ecx
|
||||
push edx
|
||||
push esi
|
||||
push edi
|
||||
push ebp
|
||||
pushfd
|
||||
push ds
|
||||
push es
|
||||
push fs
|
||||
push gs
|
||||
mov esp, dword [ss:.esp]
|
||||
|
||||
; Restore GDT
|
||||
lgdt [ss:.gdt]
|
||||
|
||||
; Jump back to pmode
|
||||
mov eax, cr0
|
||||
or al, 1
|
||||
mov cr0, eax
|
||||
jmp 0x18:.bits32
|
||||
.bits32:
|
||||
bits 32
|
||||
mov ax, 0x20
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov fs, ax
|
||||
mov gs, ax
|
||||
mov ss, ax
|
||||
|
||||
; Restore non-scratch GPRs
|
||||
pop ebp
|
||||
pop edi
|
||||
pop esi
|
||||
pop ebx
|
||||
|
||||
; Exit
|
||||
ret
|
||||
|
||||
align 16
|
||||
.esp: dd 0
|
||||
.out_regs: dd 0
|
||||
.in_regs: dd 0
|
||||
.gdt: dq 0
|
||||
124
src/lib/real.c
124
src/lib/real.c
|
|
@ -1,124 +0,0 @@
|
|||
#include <stdint.h>
|
||||
#include <lib/real.h>
|
||||
#include <lib/asm.h>
|
||||
|
||||
__attribute__((naked))
|
||||
void rm_int(uint8_t int_no, struct rm_regs *out_regs, struct rm_regs *in_regs) {
|
||||
ASM_BASIC(
|
||||
// Self-modifying code: int $int_no
|
||||
"mov al, byte ptr ss:[esp+4]\n\t"
|
||||
"mov byte ptr ds:[3f], al\n\t"
|
||||
|
||||
// Save out_regs
|
||||
"mov eax, dword ptr ss:[esp+8]\n\t"
|
||||
"mov dword ptr ds:[6f], eax\n\t"
|
||||
|
||||
// Save in_regs
|
||||
"mov eax, dword ptr ss:[esp+12]\n\t"
|
||||
"mov dword ptr ds:[7f], eax\n\t"
|
||||
|
||||
// Save GDT in case BIOS overwrites it
|
||||
"sgdt [8f]\n\t"
|
||||
|
||||
// Save non-scratch GPRs
|
||||
"push ebx\n\t"
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"push ebp\n\t"
|
||||
|
||||
// Jump to real mode
|
||||
FARJMP32("0x08", "1f")
|
||||
"1: .code16\n\t"
|
||||
"mov ax, 0x10\n\t"
|
||||
"mov ds, ax\n\t"
|
||||
"mov es, ax\n\t"
|
||||
"mov fs, ax\n\t"
|
||||
"mov gs, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
"mov eax, cr0\n\t"
|
||||
"and al, 0xfe\n\t"
|
||||
"mov cr0, eax\n\t"
|
||||
FARJMP16("0", "1f")
|
||||
"1:\n\t"
|
||||
"xor ax, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
|
||||
// Load in_regs
|
||||
"mov dword ptr ss:[5f], esp\n\t"
|
||||
"mov esp, dword ptr ss:[7f]\n\t"
|
||||
"pop gs\n\t"
|
||||
"pop fs\n\t"
|
||||
"pop es\n\t"
|
||||
"pop ds\n\t"
|
||||
"popfd\n\t"
|
||||
"pop ebp\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"pop edx\n\t"
|
||||
"pop ecx\n\t"
|
||||
"pop ebx\n\t"
|
||||
"pop eax\n\t"
|
||||
"mov esp, dword ptr ss:[5f]\n\t"
|
||||
|
||||
"sti\n\t"
|
||||
|
||||
// Indirect interrupt call
|
||||
".byte 0xcd\n\t"
|
||||
"3: .byte 0\n\t"
|
||||
|
||||
"cli\n\t"
|
||||
|
||||
// Load out_regs
|
||||
"mov dword ptr ss:[5f], esp\n\t"
|
||||
"mov esp, dword ptr ss:[6f]\n\t"
|
||||
"lea esp, [esp + 10*4]\n\t"
|
||||
"push eax\n\t"
|
||||
"push ebx\n\t"
|
||||
"push ecx\n\t"
|
||||
"push edx\n\t"
|
||||
"push esi\n\t"
|
||||
"push edi\n\t"
|
||||
"push ebp\n\t"
|
||||
"pushfd\n\t"
|
||||
"push ds\n\t"
|
||||
"push es\n\t"
|
||||
"push fs\n\t"
|
||||
"push gs\n\t"
|
||||
"mov esp, dword ptr ss:[5f]\n\t"
|
||||
|
||||
// Restore GDT
|
||||
"lgdt ss:[8f]\n\t"
|
||||
|
||||
// Jump back to pmode
|
||||
"mov eax, cr0\n\t"
|
||||
"or al, 1\n\t"
|
||||
"mov cr0, eax\n\t"
|
||||
FARJMP16("0x18", "1f")
|
||||
"1: .code32\n\t"
|
||||
"mov ax, 0x20\n\t"
|
||||
"mov ds, ax\n\t"
|
||||
"mov es, ax\n\t"
|
||||
"mov fs, ax\n\t"
|
||||
"mov gs, ax\n\t"
|
||||
"mov ss, ax\n\t"
|
||||
|
||||
// Restore non-scratch GPRs
|
||||
"pop ebp\n\t"
|
||||
"pop edi\n\t"
|
||||
"pop esi\n\t"
|
||||
"pop ebx\n\t"
|
||||
|
||||
// Exit
|
||||
"ret\n\t"
|
||||
|
||||
// ESP
|
||||
"5: .long 0\n\t"
|
||||
// out_regs
|
||||
"6: .long 0\n\t"
|
||||
// in_regs
|
||||
"7: .long 0\n\t"
|
||||
// gdt
|
||||
"8: .long 0\n\t"
|
||||
" .long 0\n\t"
|
||||
);
|
||||
}
|
||||
|
|
@ -0,0 +1,105 @@
|
|||
section .text
|
||||
|
||||
int_08_ticks_counter: dd 0
|
||||
|
||||
int_08_isr:
|
||||
bits 16
|
||||
inc dword [cs:int_08_ticks_counter]
|
||||
int 0x80 ; call callback
|
||||
iret
|
||||
bits 32
|
||||
|
||||
global pit_sleep_and_quit_on_keypress
|
||||
pit_sleep_and_quit_on_keypress:
|
||||
; Hook int 0x08
|
||||
mov edx, dword [0x08*4]
|
||||
mov dword [0x80*4], edx
|
||||
mov edx, int_08_isr
|
||||
mov dword [0x08*4], int_08_isr
|
||||
|
||||
; pit_ticks in edx
|
||||
mov edx, dword [esp+4]
|
||||
|
||||
mov dword [int_08_ticks_counter], 0
|
||||
|
||||
; Save non-scratch GPRs
|
||||
push ebx
|
||||
push esi
|
||||
push edi
|
||||
push ebp
|
||||
|
||||
; Jump to real mode
|
||||
jmp 0x08:.bits16
|
||||
.bits16:
|
||||
bits 16
|
||||
mov ax, 0x10
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov fs, ax
|
||||
mov gs, ax
|
||||
mov ss, ax
|
||||
mov eax, cr0
|
||||
and al, 0xfe
|
||||
mov cr0, eax
|
||||
jmp 0x00:.cszero
|
||||
.cszero:
|
||||
xor ax, ax
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov fs, ax
|
||||
mov gs, ax
|
||||
mov ss, ax
|
||||
|
||||
sti
|
||||
|
||||
.loop:
|
||||
cmp dword [int_08_ticks_counter], edx
|
||||
je .timeout
|
||||
|
||||
push ecx
|
||||
push edx
|
||||
mov ah, 0x01
|
||||
xor al, al
|
||||
int 0x16
|
||||
pop edx
|
||||
pop ecx
|
||||
|
||||
jz .loop
|
||||
|
||||
; on keypress
|
||||
xor ax, ax
|
||||
int 0x16
|
||||
mov eax, 1
|
||||
jmp .done
|
||||
|
||||
.timeout:
|
||||
xor eax, eax
|
||||
|
||||
.done:
|
||||
cli
|
||||
|
||||
; Jump back to pmode
|
||||
mov ebx, cr0
|
||||
or bl, 1
|
||||
mov cr0, ebx
|
||||
jmp 0x18:.bits32
|
||||
.bits32:
|
||||
bits 32
|
||||
mov bx, 0x20
|
||||
mov ds, bx
|
||||
mov es, bx
|
||||
mov fs, bx
|
||||
mov gs, bx
|
||||
mov ss, bx
|
||||
|
||||
; Restore non-scratch GPRs
|
||||
pop ebp
|
||||
pop edi
|
||||
pop esi
|
||||
pop ebx
|
||||
|
||||
; Dehook int 0x08
|
||||
mov edx, dword [0x80*4]
|
||||
mov dword [0x08*4], edx
|
||||
|
||||
ret
|
||||
Loading…
Reference in New Issue