121 lines
1.7 KiB
Plaintext
121 lines
1.7 KiB
Plaintext
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 stivale2_rt_stack
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extern stivale2_term_callback_ptr
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extern stivale2_term_write_ptr
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global stivale2_term_callback
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stivale2_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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push .mode64
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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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mov rbx, rsp
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mov rsp, [user_stack]
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call [stivale2_term_callback_ptr]
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mov rsp, rbx
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; Go 32
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push 0x18
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push .mode32
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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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global stivale2_term_write_entry
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stivale2_term_write_entry:
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bits 64
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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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mov [user_stack], rsp
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mov esp, [stivale2_rt_stack]
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mov word [user_cs], cs
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mov word [user_ds], ds
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mov word [user_es], es
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mov word [user_ss], 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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push .mode32
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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 [stivale2_term_write_ptr]
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add esp, 24
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push dword [user_cs]
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push .mode64
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retfd
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bits 64
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.mode64:
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mov ds, word [user_ds]
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mov es, word [user_es]
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mov ss, word [user_ss]
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mov rsp, [user_stack]
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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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