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# Primitives for keyboard control.
# Require Linux and a modern terminal.
== code
enable-keyboard-immediate-mode:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
#
(_maybe-open-terminal)
# var terminal-info/esi: (addr termios)
# termios is a type from the Linux kernel. We don't care how large it is.
81 5/subop/subtract %esp 0x100/imm32
89/<- %esi 4/r32/esp
# ioctl(*Terminal-file-descriptor, TCGETS, terminal-info)
89/<- %edx 6/r32/esi
b9/copy-to-ecx 0x5401/imm32/TCGETS
8b/-> *Terminal-file-descriptor 3/r32/ebx
e8/call syscall_ioctl/disp32
# terminal-info->c_iflags &= Keyboard-immediate-mode-iflags
#? (write-buffered Stderr "iflags before: ")
#? (write-int32-hex-buffered Stderr *esi)
#? (write-buffered Stderr Newline)
#? (flush Stderr)
8b/-> *esi 0/r32/eax # Termios-c_iflag
23/and *Keyboard-immediate-mode-iflags 0/r32/eax
89/<- *esi 0/r32/eax # Termios-c_iflag
#? (write-buffered Stderr "iflags after: ")
#? (write-int32-hex-buffered Stderr *esi)
#? (write-buffered Stderr Newline)
#? (flush Stderr)
# terminal-info->c_lflags &= Keyboard-immediate-mode-lflags
#? (write-buffered Stderr "lflags before: ")
#? (write-int32-hex-buffered Stderr *(esi+0xc))
#? (write-buffered Stderr Newline)
#? (flush Stderr)
8b/-> *(esi+0xc) 0/r32/eax # Termios-c_lflag
23/and *Keyboard-immediate-mode-lflags 0/r32/eax
89/<- *(esi+0xc) 0/r32/eax # Termios-c_lflag
#? (write-buffered Stderr "lflags after: ")
#? (write-int32-hex-buffered Stderr *(esi+0xc))
#? (write-buffered Stderr Newline)
#? (flush Stderr)
# ioctl(*Terminal-file-descriptor, TCSETS, terminal-info)
89/<- %edx 6/r32/esi
b9/copy-to-ecx 0x5402/imm32/TCSETS
8b/-> *Terminal-file-descriptor 3/r32/ebx
e8/call syscall_ioctl/disp32
$enable-keyboard-immediate-mode:end:
# . reclaim locals
81 0/subop/add %esp 0x100/imm32
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
enable-keyboard-type-mode:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
51/push-ecx
52/push-edx
53/push-ebx
56/push-esi
57/push-edi
#
(_maybe-open-terminal)
# var terminal-info/esi: (addr termios)
# termios is a type from the Linux kernel. We don't care how large it is.
81 5/subop/subtract %esp 0x100/imm32
89/<- %esi 4/r32/esp
# ioctl(*Terminal-file-descriptor, TCGETS, terminal-info)
89/<- %edx 6/r32/esi
b9/copy-to-ecx 0x5401/imm32/TCGETS
8b/-> *Terminal-file-descriptor 3/r32/ebx
e8/call syscall_ioctl/disp32
# terminal-info->c_iflags |= Keyboard-type-mode-iflags
8b/-> *esi 0/r32/eax # Termios-c_iflag
0b/or *Keyboard-type-mode-iflags 0/r32/eax
89/<- *esi 0/r32/eax # Termios-c_iflag
# terminal-info->c_lflags |= Keyboard-type-mode-lflags
8b/-> *(esi+0xc) 0/r32/eax # Termios-c_lflag
0b/or *Keyboard-type-mode-lflags 0/r32/eax
89/<- *(esi+0xc) 0/r32/eax # Termios-c_lflag
# ioctl(*Terminal-file-descriptor, TCSETS, terminal-info)
89/<- %edx 6/r32/esi
b9/copy-to-ecx 0x5402/imm32/TCSETS
8b/-> *Terminal-file-descriptor 3/r32/ebx
e8/call syscall_ioctl/disp32
$enable-keyboard-type-mode:end:
# . reclaim locals
81 0/subop/add %esp 0x100/imm32
# . restore registers
5f/pop-to-edi
5e/pop-to-esi
5b/pop-to-ebx
5a/pop-to-edx
59/pop-to-ecx
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
# read keys or escapes up to 4 bytes
#
# fun fact: terminal escapes and graphemes in utf-8 don't conflict!
# - in graphemes all but the first/lowest byte will have a 1 in the MSB (be
# greater than 0x7f)
# - in escapes every byte will have a 0 in the MSB
# the two categories overlap only when the first/lowest byte is 0x1b or 'esc'
#
# Only use this in immediate mode; in type (typewriter) mode 4 bytes may get
# parts of multiple keys.
read-key-from-real-keyboard: # -> result/eax: grapheme
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
# var buf/ecx: (stream byte 4)
68/push 0/imm32/data
68/push 4/imm32/size
68/push 0/imm32/read
68/push 0/imm32/write
89/<- %ecx 4/r32/esp
#
(read 0 %ecx) # => eax
8b/-> *(ecx+0xc) 0/r32/eax
$read-key-from-real-keyboard:end:
# . reclaim locals
81 0/subop/add %esp 0x10/imm32
# . restore registers
59/pop-to-ecx
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
# use this in type mode
read-line-from-real-keyboard: # in: (addr stream byte)
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
# . save registers
50/push-eax
#
(read 0 *(ebp+8)) # => eax
$read-line-from-real-keyboard:end:
# . restore registers
58/pop-to-eax
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
== data
# iflags: octal hex
# IGNBRK 0000001 0x0001
# BRKINT 0000002 0x0002
# IGNPAR 0000004 0x0004
# PARMRK 0000010 0x0008
# INPCK 0000020 0x0010
# ISTRIP 0000040 0x0020
# INLCR 0000100 0x0040
# IGNCR 0000200 0x0080
# ICRNL 0000400 0x0100
# IUCLC 0001000 0x0200
# IXON 0002000 0x0400
# IXANY 0004000 0x0800
# IXOFF 0010000 0x1000
# IMAXBEL 0020000 0x2000
# IUTF8 0040000 0x4000
# lflags:
# ISIG 0000001 0x0001
# ICANON 0000002 0x0002
# ECHO 0000010 0x0008
# ECHOE 0000020 0x0010
# ECHOK 0000040 0x0020
# ECHONL 0000100 0x0040
# NOFLSH 0000200 0x0080
# TOSTOP 0000400 0x0100
# IEXTEN 0100000 0x8000
# recipe for raw mode according to the termios.3 manpage on Linux:
# termios_p->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
# termios_p->c_oflag &= ~OPOST;
# termios_p->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
# termios_p->c_cflag &= ~(CSIZE | PARENB);
# termios_p->c_cflag |= CS8;
Keyboard-immediate-mode-iflags: # (addr tcflag_t)
#? 0xfffffa14 # ~IGNBRK & ~BRKINT & ~PARMRK & ~ISTRIP & ~INLCR & ~IGNCR & ~ICRNL & ~IXON
0xffffffff/imm32
Keyboard-immediate-mode-lflags: # (addr tcflag_t)
#? 0xffff7fb4/imm32 # ~ICANON & ~ISIG & ~IEXTEN & ~ECHO & ~ECHONL
0xffffffb5/imm32 # ~ICANON & ~ECHO & ~ECHONL
Keyboard-type-mode-iflags: # (addr tcflag_t)
0x00000000/imm32 # ~Keyboard-immediate-mode-iflags
Keyboard-type-mode-lflags: # (addr tcflag_t)
0x0000004a/imm32 # ~Keyboard-immediate-mode-lflags
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