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rax, rdi, rsi, rdx are in/out paramters.
rbx, rbp, rsp, r12-r15 are preserved.
rcx, rflags, r8-r11 are clobbered.
interrupts (including the timer!) are disabled during system calls.
stream result:
0 = success
1 = bad handle
2 = io error
3 = out of bounds
4 = does not exist
5 = not a regular file
6 = not an executable
7 = not writable
8 = not seekable
9 = socket id already used
10 = socket id not in use
11 = socket listener closed
12 = other end closed
13 = already exists
14 = not sized
15 = not readable
encode color:
rax in: 0
edi in: r + g * 256 + b * 65536
eax out: encoded color
get framebuffer:
rax in: 1
rax out: pointer to framebuffer
rdi out: width + height * 2 ** 32
esi out: pitch
framebuffer is always 32 bpp. use the encode color syscall
to encode colors. pitch is in dwords, not in bytes.
open file:
rax in: 2
rdi in: pointer to file path
rsi in: file path length
rdx in:
bit 0: allow creation
bit 1: only allow creation
rax out: stream result
rdi out: stream handle (if rax = success)
end this thread:
rax in: 3
edi in: exit code (signed, only used if this was last thread)
get new pages:
rax in: 4
rdi in: number of pages to allocate
rax out: start of first page
the allocated pages are next to each other, writable, and not executable.
get input packet:
rax in: 5
al out:
bit 7: was mouse packet
if bit 7:
bit 0: left mouse button down
bit 1: right mouse button down
bit 2: middle mouse button down
if bit 7:
di out: mouse x change (signed)
si out: mouse y change (signed)
else:
edi out: key packet
create private socket:
rax in: 6
rax out: end 1 stream handle
rdi out: end 2 stream handle
create socket listener:
rax in: 7
rdi in: pointer to id string
rsi in: id string length
rax out: stream result
rdi out: listener handle (if rax = 0)
stop socket listener:
rax in: 8
rdi in: listener handle
accept socket connection:
rax in: 9
rdi in: listener handle
rax out: stream result
rdi out: stream handle
connect to socket:
rax in: 10
rdi in: pointer to id string
rsi in: id string length
rax out: stream result
rdi out: stream handle (if rax = 0)
close stream:
rax in: 11
rdi in: stream handle
seek stream:
returns "not seekable" for sockets
rax in: 12
rdi in: stream handle
sil in:
0 = relative to beginning
1 = relative to end
2 = relative to current position
rdx in: offset (signed)
rax out: stream result
read from stream:
rax in: 13
rdi in: stream handle
rsi in: count
rdx in: pointer to buffer
rax out: stream result
write to stream:
rax in: 14
rdi in: stream handle
rsi in: count
rdx in: pointer to buffer
rax out: stream result
get stream length:
returns "not sized" for sockets
rax in: 15
rdi in: stream handle
rax out: stream result
rdi out: stream length (if rax = success)
start process:
rax in: 16
rdi in: pointer to process start info struct
rax out: stream result
rdi out: process handle (if rax = success)
process start info struct:
qword: file path length
qword: pointer to file path
qword: count of environment variables
qword: pointer to array of environment variable structs
qword: count of gifted stream ends
qword: pointer to array of gifted stream structs
environment variable struct:
qword: name length
qword: pointer to name
qword: value length
qword: pointer to value
gifted stream struct:
qword: stream handle here
qword: new stream handle in child
new handle must be < 65536
any gifted streams must not have threads waiting to read from our end
end this process:
rax in: 17
edi in: exit code (signed)
set stream length:
returns "not sized" for sockets
rax in: 18
rdi in: stream handle
rsi in: new length
rax out: stream result
get other end process handle:
returns "other end closed" for files
rax in: 19
rdi in: stream handle
rax out: stream result
rdi out: process handle (if rax = success)
start thread:
rax in: 20
rdi in: entry point
rsi in: argument
at entry, rsp is set to the top of a new stack, rdi is set
to the argument, and the other registers are undefined.
clear socket read queue:
rax in: 21
rdi in: stream handle
rax out: number of bytes cleared (0 on bad handle or not a socket)
get environment variable length:
rax in: 22
rdi in: pointer to variable name
rsi in: variable name length
rax out: variable value length, or -1 if unset
get environment variable value:
rax in: 23
rdi in: pointer to variable name
rsi in: variable name length
rdx in: pointer to buffer for variable value
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