mirror of
https://github.com/Mathewnd/Astral.git
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Matheus
250 lines
4.8 KiB
NASM
250 lines
4.8 KiB
NASM
section .rodata
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extern syscall_print
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extern syscall_mmap
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extern syscall_openat
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extern syscall_read
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extern syscall_seek
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extern syscall_close
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extern syscall_archctl
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extern syscall_write
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extern syscall_getpid
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extern syscall_fstat
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extern syscall_fstatat
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extern syscall_fork
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extern syscall_execve
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extern syscall_exit
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extern syscall_waitpid
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extern syscall_munmap
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extern syscall_getdents
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extern syscall_dup
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extern syscall_dup2
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extern syscall_dup3
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extern syscall_fcntl
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extern syscall_chdir
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extern syscall_pipe2
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extern syscall_isatty
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extern syscall_faccessat
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extern syscall_unlinkat
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extern syscall_ioctl
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extern syscall_mkdirat
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extern syscall_clockget
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extern syscall_linkat
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extern syscall_readlinkat
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extern syscall_fchmod
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extern syscall_fchmodat
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extern syscall_umask
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extern syscall_poll
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extern syscall_nanosleep
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extern syscall_ftruncate
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extern syscall_mount
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extern syscall_fchownat
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extern syscall_utimensat
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extern syscall_renameat
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extern syscall_socket
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extern syscall_bind
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extern syscall_sendmsg
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extern syscall_setsockopt
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extern syscall_recvmsg
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extern syscall_listen
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extern syscall_connect
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extern syscall_accept
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extern syscall_newthread
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extern syscall_threadexit
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extern syscall_futex
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extern syscall_gettid
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extern syscall_getppid
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extern syscall_getpgid
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extern syscall_getsid
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extern syscall_setsid
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extern syscall_setpgid
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syscalltab:
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dq syscall_print
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dq syscall_mmap
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dq syscall_openat
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dq syscall_read
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dq syscall_seek
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dq syscall_close
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dq syscall_archctl
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dq syscall_write
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dq syscall_getpid
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dq syscall_fstat
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dq syscall_fstatat
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dq syscall_fork
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dq syscall_execve
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dq syscall_exit
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dq syscall_waitpid
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dq syscall_munmap
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dq syscall_getdents
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dq syscall_dup
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dq syscall_dup2
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dq syscall_dup3
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dq syscall_fcntl
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dq syscall_chdir
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dq syscall_pipe2
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dq syscall_isatty
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dq syscall_faccessat
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dq syscall_unlinkat
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dq syscall_ioctl
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dq syscall_mkdirat
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dq syscall_clockget
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dq syscall_linkat
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dq syscall_readlinkat
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dq syscall_fchmod
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dq syscall_fchmodat
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dq syscall_umask
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dq syscall_poll
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dq syscall_nanosleep
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dq syscall_ftruncate
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dq syscall_mount
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dq syscall_fchownat
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dq syscall_utimensat
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dq syscall_renameat
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dq syscall_socket
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dq syscall_bind
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dq syscall_sendmsg
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dq syscall_setsockopt
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dq syscall_recvmsg
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dq syscall_listen
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dq syscall_connect
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dq syscall_accept
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dq syscall_newthread
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dq syscall_threadexit
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dq syscall_futex
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dq syscall_gettid
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dq syscall_getppid
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dq syscall_getpgid
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dq syscall_getsid
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dq syscall_setsid
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dq syscall_setpgid
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syscallcount equ 58
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section .text
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global arch_syscall_entry
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; on entry:
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; rcx has the return address
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; r11 has the old rflags
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; syscall arguments:
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; rax has the syscall number
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; rdi has the first argument
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; rsi has the second argument
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; rdx has the third argument
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; r10 has the fourth argument
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; r8 has the fifth argument
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; r9 has the sixth argument
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; return:
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; rdx has errno
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; rax has return value
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arch_syscall_entry:
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swapgs
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; saving the syscall number on cr2 is cursed but we need this extra register
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; and taking a page fault here would result in a triple fault anyways
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; because it's still using the user stack
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mov cr2, rax
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; rax can be used just fine now
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mov rax, [gs:0x0] ; cpu pointer
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mov rax, [rax] ; thread pointer
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mov rax, [rax] ; kernel stack top
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xchg rsp, rax ; switch stack pointers
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; push context
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push qword 0x1b ; user SS
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push qword rax ; user RSP
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mov rax, cr2 ; restore syscall number
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push r11 ; rflags is stored in r11
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push qword 0x23 ; user CS
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push qword rcx ; save return RIP
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push qword 0 ; error
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push rbp
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push rsi
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push rdi
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push r15
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push r14
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push r13
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push r12
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push r11
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push r10
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push r9
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push r8
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push rdx
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push rcx
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push rbx
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push rax
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mov rbx, ds
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push rbx
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mov rbx, es
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push rbx
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mov rbx, fs
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push rbx
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mov rbx, gs
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push rbx
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mov rbx, cr2
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push rbx
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; prepare arguments for the functions
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push r9
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mov r9, r8
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mov r8, r10
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mov rcx, rdx
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mov rdx, rsi
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mov rsi, rdi
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; call logging function
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sti
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mov rdi, rax
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extern arch_syscall_log
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call arch_syscall_log ; compiled with __attribute__((no_caller_saved_registers))
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; prepare context argument
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mov rdi, rsp
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add rdi, 8 ; context pointer is after r9 argument
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cmp rax, syscallcount
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jae .nosyscall
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call [syscalltab + rax * 8]
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jmp .return
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.nosyscall:
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extern syscall_invalid
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call syscall_invalid
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.return:
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cli
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; call return logging function
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mov rdi, rax
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mov rsi, rdx
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extern arch_syscall_log_return
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call arch_syscall_log_return ; compiled with __attribute__((no_caller_saved_registers))
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mov rdi, rsp
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add rdi, 8 ; context pointer is after r9 argument
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extern sched_userspacecheck
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call sched_userspacecheck ; compiled with __attribute__((no_caller_saved_registers))
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; restore context
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add rsp, 32 ; r9 argument, cr2, gs, and fs are not popped.
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pop rbx
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mov es,rbx
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pop rbx
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mov ds,rbx
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add rsp, 8 ; rax
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pop rbx
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pop rcx
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add rsp, 8 ; rdx
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pop r8
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pop r9
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pop r10
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pop r11
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pop r12
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pop r13
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pop r14
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pop r15
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pop rdi
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pop rsi
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pop rbp
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add rsp, 8 ; remove error code
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pop rcx
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add rsp, 8 ; user CS
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pop r11 ; rflags
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pop rsp
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swapgs
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o64 sysret
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