mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-26 16:47:40 +01:00
484 lines
9.3 KiB
NASM
484 lines
9.3 KiB
NASM
|
|
||
|
|
DEFAULT_HANDLER_SIZE: equ 9 ; size of exception/interrupt stub
|
||
|
|
SYS_CODE_SEL64: equ 0x38 ; 64-bit code selector in GDT
|
||
|
|
PE_OFFSET_IN_MZ_STUB: equ 0x3c ; place in MsDos stub for offset to PE Header
|
||
|
|
VGA_FB: equ 0x000b8000 ; VGA framebuffer for 80x25 mono mode
|
||
|
|
VGA_LINE: equ 80 * 2 ; # bytes in one line
|
||
|
|
BASE_ADDR_64: equ 0x00021000
|
||
|
|
STACK_TOP: equ 0x001fffe8
|
||
|
|
SIZE: equ 0x1000
|
||
|
|
|
||
|
|
struc EFILDR_IMAGE
|
||
|
|
.CheckSum: resd 1
|
||
|
|
.Offset: resd 1
|
||
|
|
.Length: resd 1
|
||
|
|
.FileName: resb 52
|
||
|
|
endstruc
|
||
|
|
|
||
|
|
struc EFILDR_HEADER
|
||
|
|
.Signature: resd 1
|
||
|
|
.HeaderCheckSum: resd 1
|
||
|
|
.FileLength: resd 1
|
||
|
|
.NumberOfImages: resd 1
|
||
|
|
endstruc
|
||
|
|
|
||
|
|
struc PE_HEADER
|
||
|
|
resb 6
|
||
|
|
.NumberOfSections: resw 1
|
||
|
|
resb 12
|
||
|
|
.SizeOfOptionalHeader: resw 1
|
||
|
|
resb 2
|
||
|
|
.Magic: resb 16
|
||
|
|
.AddressOfEntryPoint: resd 1
|
||
|
|
resb 4
|
||
|
|
.ImageBase64: resd 1
|
||
|
|
endstruc
|
||
|
|
|
||
|
|
struc PE_SECTION_HEADER
|
||
|
|
resb 12
|
||
|
|
.VirtualAddress: resd 1
|
||
|
|
.SizeOfRawData: resd 1
|
||
|
|
.PointerToRawData: resd 1
|
||
|
|
resb 16
|
||
|
|
endstruc
|
||
|
|
|
||
|
|
%macro StubWithNoCode 1
|
||
|
|
push 0 ; push error code place holder on the stack
|
||
|
|
push %1
|
||
|
|
jmp strict qword commonIdtEntry
|
||
|
|
%endmacro
|
||
|
|
|
||
|
|
%macro StubWithACode 1
|
||
|
|
times 2 nop
|
||
|
|
push %1
|
||
|
|
jmp strict qword commonIdtEntry
|
||
|
|
%endmacro
|
||
|
|
|
||
|
|
%macro PrintReg 2
|
||
|
|
mov esi, %1
|
||
|
|
call PrintString
|
||
|
|
mov rax, [rbp + %2]
|
||
|
|
call PrintQword
|
||
|
|
%endmacro
|
||
|
|
|
||
|
|
bits 64
|
||
|
|
org BASE_ADDR_64
|
||
|
|
global _start
|
||
|
|
_start:
|
||
|
|
mov esp, STACK_TOP
|
||
|
|
;
|
||
|
|
; set OSFXSR and OSXMMEXCPT because some code will use XMM registers
|
||
|
|
;
|
||
|
|
mov rax, cr4
|
||
|
|
or rax, 0x600
|
||
|
|
mov cr4, rax
|
||
|
|
|
||
|
|
;
|
||
|
|
; Populate IDT with meaningful offsets for exception handlers...
|
||
|
|
;
|
||
|
|
sidt [REL Idtr]
|
||
|
|
|
||
|
|
mov eax, StubTable
|
||
|
|
mov ebx, eax ; use bx to copy 15..0 to descriptors
|
||
|
|
shr eax, 16 ; use ax to copy 31..16 to descriptors
|
||
|
|
; 63..32 of descriptors is 0
|
||
|
|
mov ecx, 0x78 ; 78h IDT entries to initialize with unique entry points
|
||
|
|
mov edi, [REL Idtr + 2]
|
||
|
|
|
||
|
|
.StubLoop: ; loop through all IDT entries exception handlers and initialize to default handler
|
||
|
|
mov [rdi], bx ; write bits 15..0 of offset
|
||
|
|
mov word [rdi + 2], SYS_CODE_SEL64 ; SYS_CODE_SEL64 from GDT
|
||
|
|
mov word [rdi + 4], 0x8e00 ; type = 386 interrupt gate, present
|
||
|
|
mov [rdi + 6], ax ; write bits 31..16 of offset
|
||
|
|
mov dword [rdi + 8], 0 ; write bits 63..32 of offset
|
||
|
|
add edi, 16 ; move up to next descriptor
|
||
|
|
add ebx, DEFAULT_HANDLER_SIZE ; move to next entry point
|
||
|
|
loop .StubLoop ; loop back through again until all descriptors are initialized
|
||
|
|
|
||
|
|
;
|
||
|
|
; Load EFILDR
|
||
|
|
;
|
||
|
|
mov esi, BlockSignature + 2
|
||
|
|
add esi, [rsi + EFILDR_HEADER_size + EFILDR_IMAGE.Offset] ; esi = Base of EFILDR.C
|
||
|
|
mov ebp, [rsi + PE_OFFSET_IN_MZ_STUB]
|
||
|
|
add ebp, esi ; ebp = PE Image Header for EFILDR.C
|
||
|
|
mov edi, [rbp + PE_HEADER.ImageBase64] ; edi = ImageBase (63..32 is zero, ignore)
|
||
|
|
mov eax, [rbp + PE_HEADER.AddressOfEntryPoint] ; eax = EntryPoint
|
||
|
|
add eax, edi ; eax = ImageBase + EntryPoint
|
||
|
|
mov [REL .EfiLdrOffset], eax ; Modify jump instruction for correct entry point
|
||
|
|
|
||
|
|
movzx ebx, word [rbp + PE_HEADER.NumberOfSections] ; bx = Number of sections
|
||
|
|
movzx eax, word [rbp + PE_HEADER.SizeOfOptionalHeader]; ax = Optional Header Size
|
||
|
|
add ebp, eax
|
||
|
|
add ebp, PE_HEADER.Magic ; ebp = Start of 1st Section
|
||
|
|
|
||
|
|
.SectionLoop:
|
||
|
|
push rsi ; Save Base of EFILDR.C
|
||
|
|
push rdi ; Save ImageBase
|
||
|
|
add esi, [rbp + PE_SECTION_HEADER.PointerToRawData] ; esi = Base of EFILDR.C + PointerToRawData
|
||
|
|
add edi, [rbp + PE_SECTION_HEADER.VirtualAddress] ; edi = ImageBase + VirtualAddress
|
||
|
|
mov ecx, [rbp + PE_SECTION_HEADER.SizeOfRawData] ; ecx = SizeOfRawData
|
||
|
|
|
||
|
|
cld
|
||
|
|
shr ecx, 2
|
||
|
|
rep movsd
|
||
|
|
|
||
|
|
pop rdi ; Restore ImageBase
|
||
|
|
pop rsi ; Restore Base of EFILDR.C
|
||
|
|
|
||
|
|
add ebp, PE_SECTION_HEADER_size ; ebp = Pointer to next section record
|
||
|
|
dec ebx
|
||
|
|
jnz .SectionLoop
|
||
|
|
|
||
|
|
movzx ecx, word [REL Idtr] ; get size of IDT
|
||
|
|
inc ecx
|
||
|
|
add ecx, [REL Idtr + 2] ; add to base of IDT to get location of memory map...
|
||
|
|
; argument in RCX
|
||
|
|
.EfiLdrOffset: equ $ + 1
|
||
|
|
mov eax, 0x00401000
|
||
|
|
jmp rax ; jump to entry point
|
||
|
|
|
||
|
|
StubTable:
|
||
|
|
%assign i 0
|
||
|
|
%rep 8
|
||
|
|
StubWithNoCode i
|
||
|
|
%assign i i+1
|
||
|
|
%endrep
|
||
|
|
StubWithACode 8 ; Double Fault
|
||
|
|
StubWithNoCode 9
|
||
|
|
StubWithACode 10 ; Invalid TSS
|
||
|
|
StubWithACode 11 ; Segment Not Present
|
||
|
|
StubWithACode 12 ; Stack Fault
|
||
|
|
StubWithACode 13 ; GP Fault
|
||
|
|
StubWithACode 14 ; Page Fault
|
||
|
|
StubWithNoCode 15
|
||
|
|
StubWithNoCode 16
|
||
|
|
StubWithACode 17 ; Alignment Check
|
||
|
|
%assign i 18
|
||
|
|
%rep 102
|
||
|
|
StubWithNoCode i
|
||
|
|
%assign i i+1
|
||
|
|
%endrep
|
||
|
|
|
||
|
|
commonIdtEntry:
|
||
|
|
push rax
|
||
|
|
push rcx
|
||
|
|
push rdx
|
||
|
|
push rbx
|
||
|
|
push rsp
|
||
|
|
push rbp
|
||
|
|
push rsi
|
||
|
|
push rdi
|
||
|
|
push r8
|
||
|
|
push r9
|
||
|
|
push r10
|
||
|
|
push r11
|
||
|
|
push r12
|
||
|
|
push r13
|
||
|
|
push r14
|
||
|
|
push r15
|
||
|
|
mov rbp, rsp
|
||
|
|
;
|
||
|
|
; At this point the stack looks like this:
|
||
|
|
;
|
||
|
|
; Calling SS
|
||
|
|
; Calling RSP
|
||
|
|
; rflags
|
||
|
|
; Calling CS
|
||
|
|
; Calling RIP
|
||
|
|
; Error code or 0
|
||
|
|
; Int num or 0ffh for unknown int num
|
||
|
|
; rax
|
||
|
|
; rcx
|
||
|
|
; rdx
|
||
|
|
; rbx
|
||
|
|
; rsp
|
||
|
|
; rbp
|
||
|
|
; rsi
|
||
|
|
; rdi
|
||
|
|
; r8
|
||
|
|
; r9
|
||
|
|
; r10
|
||
|
|
; r11
|
||
|
|
; r12
|
||
|
|
; r13
|
||
|
|
; r14
|
||
|
|
; r15 <------- RSP, RBP
|
||
|
|
;
|
||
|
|
|
||
|
|
call ClearScreen
|
||
|
|
mov esi, String1
|
||
|
|
call PrintString
|
||
|
|
mov eax, [rbp + 16 * 8] ; move Int number into EAX
|
||
|
|
cmp eax, 19
|
||
|
|
ja .PrintDefaultString
|
||
|
|
mov esi, [rax * 8 + StringTable] ; get offset from StringTable to actual string address
|
||
|
|
jmp .PrintTheString
|
||
|
|
.PrintDefaultString:
|
||
|
|
mov esi, IntUnknownString
|
||
|
|
; patch Int number
|
||
|
|
mov edx, eax
|
||
|
|
call A2C
|
||
|
|
mov [rsi + 1], al
|
||
|
|
mov eax, edx
|
||
|
|
shr eax, 4
|
||
|
|
call A2C
|
||
|
|
mov [rsi], al
|
||
|
|
.PrintTheString:
|
||
|
|
call PrintString
|
||
|
|
PrintReg String2, 19 * 8 ; CS
|
||
|
|
mov byte [rdi], ':'
|
||
|
|
add edi, 2
|
||
|
|
mov rax, [rbp + 18 * 8] ; RIP
|
||
|
|
call PrintQword
|
||
|
|
mov esi, String3
|
||
|
|
call PrintString
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 2 * VGA_LINE
|
||
|
|
|
||
|
|
PrintReg StringRax, 15 * 8
|
||
|
|
|
||
|
|
PrintReg StringRcx, 14 * 8
|
||
|
|
|
||
|
|
PrintReg StringRdx, 13 * 8
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 3 * VGA_LINE
|
||
|
|
|
||
|
|
PrintReg StringRbx, 12 * 8
|
||
|
|
|
||
|
|
PrintReg StringRsp, 21 * 8
|
||
|
|
|
||
|
|
PrintReg StringRbp, 10 * 8
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 4 * VGA_LINE
|
||
|
|
|
||
|
|
PrintReg StringRsi, 9 * 8
|
||
|
|
|
||
|
|
PrintReg StringRdi, 8 * 8
|
||
|
|
|
||
|
|
PrintReg StringEcode, 17 * 8
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 5 * VGA_LINE
|
||
|
|
|
||
|
|
PrintReg StringR8, 7 * 8
|
||
|
|
|
||
|
|
PrintReg StringR9, 6 * 8
|
||
|
|
|
||
|
|
PrintReg StringR10, 5 * 8
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 6 * VGA_LINE
|
||
|
|
|
||
|
|
PrintReg StringR11, 4 * 8
|
||
|
|
|
||
|
|
PrintReg StringR12, 3 * 8
|
||
|
|
|
||
|
|
PrintReg StringR13, 2 * 8
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 7 * VGA_LINE
|
||
|
|
|
||
|
|
PrintReg StringR14, 8
|
||
|
|
|
||
|
|
PrintReg StringR15, 0
|
||
|
|
|
||
|
|
PrintReg StringSs, 22 * 8
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 8 * VGA_LINE
|
||
|
|
|
||
|
|
PrintReg StringRflags, 20 * 8
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 10 * VGA_LINE
|
||
|
|
|
||
|
|
mov rsi, rbp
|
||
|
|
add rsi, 23 * 8 ; stack beyond SS
|
||
|
|
mov ecx, 4
|
||
|
|
|
||
|
|
.OuterLoop:
|
||
|
|
push rcx
|
||
|
|
mov ecx, 4
|
||
|
|
mov edx, edi
|
||
|
|
|
||
|
|
.InnerLoop:
|
||
|
|
mov rax, [rsi]
|
||
|
|
call PrintQword
|
||
|
|
add rsi, 8
|
||
|
|
mov byte [rdi], ' '
|
||
|
|
add edi, 2
|
||
|
|
loop .InnerLoop
|
||
|
|
|
||
|
|
pop rcx
|
||
|
|
add edx, VGA_LINE
|
||
|
|
mov edi, edx
|
||
|
|
loop .OuterLoop
|
||
|
|
|
||
|
|
mov edi, VGA_FB + 15 * VGA_LINE
|
||
|
|
|
||
|
|
mov rsi, [rbp + 18 * 8] ; RIP
|
||
|
|
sub rsi, 8 * 8 ; code preceding RIP
|
||
|
|
|
||
|
|
mov ecx, 4
|
||
|
|
|
||
|
|
.OuterLoop1:
|
||
|
|
push rcx
|
||
|
|
mov ecx, 4
|
||
|
|
mov edx, edi
|
||
|
|
|
||
|
|
.InnerLoop1:
|
||
|
|
mov rax, [rsi]
|
||
|
|
call PrintQword
|
||
|
|
add rsi, 8
|
||
|
|
mov byte [rdi], ' '
|
||
|
|
add edi, 2
|
||
|
|
loop .InnerLoop1
|
||
|
|
|
||
|
|
pop rcx
|
||
|
|
add edx, VGA_LINE
|
||
|
|
mov edi, edx
|
||
|
|
loop .OuterLoop1
|
||
|
|
|
||
|
|
.Halt:
|
||
|
|
hlt
|
||
|
|
jmp .Halt
|
||
|
|
;
|
||
|
|
; Return
|
||
|
|
;
|
||
|
|
mov rsp, rbp
|
||
|
|
pop r15
|
||
|
|
pop r14
|
||
|
|
pop r13
|
||
|
|
pop r12
|
||
|
|
pop r11
|
||
|
|
pop r10
|
||
|
|
pop r9
|
||
|
|
pop r8
|
||
|
|
pop rdi
|
||
|
|
pop rsi
|
||
|
|
pop rbp
|
||
|
|
pop rax ; rsp
|
||
|
|
pop rbx
|
||
|
|
pop rdx
|
||
|
|
pop rcx
|
||
|
|
pop rax
|
||
|
|
add rsp, 16 ; error code and INT number
|
||
|
|
iretq
|
||
|
|
|
||
|
|
PrintString:
|
||
|
|
push rax
|
||
|
|
.loop:
|
||
|
|
mov al, [rsi]
|
||
|
|
test al, al
|
||
|
|
jz .done
|
||
|
|
mov [rdi], al
|
||
|
|
inc esi
|
||
|
|
add edi, 2
|
||
|
|
jmp .loop
|
||
|
|
.done:
|
||
|
|
pop rax
|
||
|
|
ret
|
||
|
|
|
||
|
|
; RAX contains qword to print
|
||
|
|
; RDI contains memory location (screen location) to print it to
|
||
|
|
|
||
|
|
PrintQword:
|
||
|
|
push rcx
|
||
|
|
push rbx
|
||
|
|
push rax
|
||
|
|
mov ecx, 16
|
||
|
|
.looptop:
|
||
|
|
rol rax, 4
|
||
|
|
mov bl, al
|
||
|
|
and bl, 15
|
||
|
|
add bl, '0'
|
||
|
|
cmp bl, '9'
|
||
|
|
jbe .is_digit
|
||
|
|
add bl, 7
|
||
|
|
.is_digit:
|
||
|
|
mov [rdi], bl
|
||
|
|
add edi, 2
|
||
|
|
loop .looptop
|
||
|
|
pop rax
|
||
|
|
pop rbx
|
||
|
|
pop rcx
|
||
|
|
ret
|
||
|
|
|
||
|
|
ClearScreen:
|
||
|
|
push rax
|
||
|
|
push rcx
|
||
|
|
mov ax, 0x0c20
|
||
|
|
mov edi, VGA_FB
|
||
|
|
mov ecx, 80 * 25
|
||
|
|
rep stosw
|
||
|
|
mov edi, VGA_FB
|
||
|
|
pop rcx
|
||
|
|
pop rax
|
||
|
|
ret
|
||
|
|
|
||
|
|
A2C:
|
||
|
|
and al, 15
|
||
|
|
add al, '0'
|
||
|
|
cmp al, '9'
|
||
|
|
jbe .is_digit
|
||
|
|
add al, 7
|
||
|
|
.is_digit:
|
||
|
|
ret
|
||
|
|
|
||
|
|
String1: db '*** INT ', 0
|
||
|
|
|
||
|
|
Int0String: db '00h Divide by 0 -', 0
|
||
|
|
Int1String: db '01h Debug exception -', 0
|
||
|
|
Int2String: db '02h NMI -', 0
|
||
|
|
Int3String: db '03h Breakpoint -', 0
|
||
|
|
Int4String: db '04h Overflow -', 0
|
||
|
|
Int5String: db '05h Bound -', 0
|
||
|
|
Int6String: db '06h Invalid opcode -', 0
|
||
|
|
Int7String: db '07h Device not available -', 0
|
||
|
|
Int8String: db '08h Double fault -', 0
|
||
|
|
Int9String: db '09h Coprocessor seg overrun (reserved) -', 0
|
||
|
|
Int10String: db '0Ah Invalid TSS -', 0
|
||
|
|
Int11String: db '0Bh Segment not present -', 0
|
||
|
|
Int12String: db '0Ch Stack fault -', 0
|
||
|
|
Int13String: db '0Dh General protection fault -', 0
|
||
|
|
Int14String: db '0Eh Page fault -', 0
|
||
|
|
Int15String: db '0Fh (Intel reserved) -', 0
|
||
|
|
Int16String: db '10h Floating point error -', 0
|
||
|
|
Int17String: db '11h Alignment check -', 0
|
||
|
|
Int18String: db '12h Machine check -', 0
|
||
|
|
Int19String: db '13h SIMD Floating-Point Exception -', 0
|
||
|
|
IntUnknownString: db '??h Unknown interrupt -', 0
|
||
|
|
|
||
|
|
align 8, db 0
|
||
|
|
|
||
|
|
StringTable:
|
||
|
|
%assign i 0
|
||
|
|
%rep 20
|
||
|
|
dq Int%[i]String
|
||
|
|
%assign i i+1
|
||
|
|
%endrep
|
||
|
|
|
||
|
|
String2: db ' HALT!! *** (', 0
|
||
|
|
String3: db ')', 0
|
||
|
|
StringRax: db 'RAX=', 0
|
||
|
|
StringRcx: db ' RCX=', 0
|
||
|
|
StringRdx: db ' RDX=', 0
|
||
|
|
StringRbx: db 'RBX=', 0
|
||
|
|
StringRsp: db ' RSP=', 0
|
||
|
|
StringRbp: db ' RBP=', 0
|
||
|
|
StringRsi: db 'RSI=', 0
|
||
|
|
StringRdi: db ' RDI=', 0
|
||
|
|
StringEcode: db ' ECODE=', 0
|
||
|
|
StringR8: db 'R8 =', 0
|
||
|
|
StringR9: db ' R9 =', 0
|
||
|
|
StringR10: db ' R10=', 0
|
||
|
|
StringR11: db 'R11=', 0
|
||
|
|
StringR12: db ' R12=', 0
|
||
|
|
StringR13: db ' R13=', 0
|
||
|
|
StringR14: db 'R14=', 0
|
||
|
|
StringR15: db ' R15=', 0
|
||
|
|
StringSs: db ' SS =', 0
|
||
|
|
StringRflags: db 'RFLAGS=', 0
|
||
|
|
|
||
|
|
align 2, db 0
|
||
|
|
Idtr:
|
||
|
|
times SIZE - 2 - $ + $$ db 0
|
||
|
|
BlockSignature:
|
||
|
|
dw 0xaa55
|