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on application entry:
there is a 1MiB - 8KiB area mapped writable and not
executable with guard pages on either side, and rsp is
set to the top of that. all other registers are set to 0.
the ARGC environment variable holds the number of arguments to main.
the ARGV0, ARGV1, ARGV2, etc environment variables hold those arguments.
for all system calls:
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
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.
read key packet:
rax in: 5
eax 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)
if the listener is closed while this syscall is blocked, rax is
set to "socket id not in use" and not "socket listener closed"
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
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
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