141 lines
2.3 KiB
Plaintext
141 lines
2.3 KiB
Plaintext
extern _GLOBAL_OFFSET_TABLE_
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section .bss
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user_stack:
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resq 1
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user_cs: resq 1
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user_ds: resq 1
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user_es: resq 1
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user_ss: resq 1
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section .text
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extern term_write
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extern limine_rt_stack
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extern limine_term_callback_ptr
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extern limine_term_write_ptr
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global limine_term_callback
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limine_term_callback:
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bits 32
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push ebp
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mov ebp, esp
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push ebx
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push esi
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push edi
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; Go 64
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push 0x28
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call .p1
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.p1:
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add dword [esp], .mode64 - .p1
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retfd
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bits 64
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.mode64:
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mov eax, 0x30
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov rdi, [rbp + 8]
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mov rsi, [rbp + 16]
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mov rdx, [rbp + 24]
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mov rcx, [rbp + 32]
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mov r8, [rbp + 40]
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call .get_got
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.get_got:
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pop rax
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add rax, _GLOBAL_OFFSET_TABLE_ + $$ - .get_got wrt ..gotpc
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mov rbx, rsp
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mov rsp, [rax + user_stack wrt ..gotoff]
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call [rax + limine_term_callback_ptr wrt ..gotoff]
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mov rsp, rbx
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; Go 32
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push 0x18
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call .p2
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.p2:
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add qword [rsp], .mode32 - .p2
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retfq
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bits 32
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.mode32:
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mov eax, 0x20
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mov ds, ax
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mov es, ax
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mov ss, ax
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pop edi
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pop esi
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pop ebx
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pop ebp
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ret
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bits 64
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global limine_term_write_entry
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limine_term_write_entry:
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push rbx
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push rbp
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push r12
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push r13
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push r14
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push r15
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call .get_got
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.get_got:
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pop rbx
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add ebx, _GLOBAL_OFFSET_TABLE_ + $$ - .get_got wrt ..gotpc
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mov [rbx + user_stack wrt ..gotoff], rsp
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mov esp, [rbx + limine_rt_stack wrt ..gotoff]
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mov word [rbx + user_cs wrt ..gotoff], cs
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mov word [rbx + user_ds wrt ..gotoff], ds
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mov word [rbx + user_es wrt ..gotoff], es
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mov word [rbx + user_ss wrt ..gotoff], ss
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push rdx
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push rsi
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push rdi
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push 0x18
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call .p1
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.p1:
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add qword [rsp], .mode32 - .p1
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retfq
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bits 32
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.mode32:
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mov eax, 0x20
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mov ds, ax
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mov es, ax
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mov ss, ax
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call [ebx + limine_term_write_ptr wrt ..gotoff]
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add esp, 24
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push dword [ebx + user_cs wrt ..gotoff]
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call .p2
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.p2:
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add dword [esp], .mode64 - .p2
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retfd
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bits 64
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.mode64:
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mov ds, word [rbx + user_ds wrt ..gotoff]
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mov es, word [rbx + user_es wrt ..gotoff]
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mov ss, word [rbx + user_ss wrt ..gotoff]
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mov rsp, [rbx + user_stack wrt ..gotoff]
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pop r15
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pop r14
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pop r13
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pop r12
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pop rbp
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pop rbx
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ret
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