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plan9: more syscalls

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This commit is contained in:
Jacob G-W 2021-10-17 11:45:14 -04:00
parent fe314e60bb
commit 73be14027d
2 changed files with 73 additions and 19 deletions
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26
lib/std/os/plan9.zig
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@ -64,6 +64,28 @@ pub fn pwrite(fd: usize, buf: [*]const u8, count: usize, offset: usize) usize {
return syscall_bits.syscall4(.PWRITE, fd, @ptrToInt(buf), count, offset);
}
pub fn exits(status: ?[*:0]const u8) void {
syscall_bits.syscall1(.EXITS, if (status) |s| @ptrToInt(s) else 0);
pub fn open(path: [*:0]const u8, omode: OpenMode) usize {
return syscall_bits.syscall2(.OPEN, @ptrToInt(path), @enumToInt(omode));
}
pub fn create(path: [*:0]const u8, omode: OpenMode, perms: usize) usize {
return syscall_bits.syscall3(.CREATE, @ptrToInt(path), @enumToInt(omode), perms);
}
pub fn exits(status: ?[*:0]const u8) void {
_ = syscall_bits.syscall1(.EXITS, if (status) |s| @ptrToInt(s) else 0);
}
pub fn close(fd: usize) usize {
return syscall_bits.syscall1(.CLOSE, fd);
}
pub const OpenMode = enum(usize) {
OREAD = 0, //* open for read
OWRITE = 1, //* write
ORDWR = 2, //* read and write
OEXEC = 3, //* execute, == read but check execute permission
OTRUNC = 16, //* or'ed in (except for exec), truncate file first
OCEXEC = 32, //* or'ed in (per file descriptor), close on exec
ORCLOSE = 64, //* or'ed in, remove on close
OEXCL = 0x1000, //* or'ed in, exclusive create
};

66
lib/std/os/plan9/x86_64.zig
View File

@ -1,7 +1,54 @@
const plan9 = @import("../plan9.zig");
// TODO get ret from inline asm
// TODO better inline asm
pub fn syscall1(sys: plan9.SYS, arg0: usize) usize {
return asm volatile (
\\push %%r8
\\push $0
\\syscall
\\pop %%r11
\\pop %%r11
: [ret] "={rax}" (-> usize),
: [syscall_number] "{rbp}" (@enumToInt(sys)),
[arg0] "{r8}" (arg0),
: "rcx", "rax", "rbp", "r11", "memory"
);
}
pub fn syscall2(sys: plan9.SYS, arg0: usize, arg1: usize) usize {
return asm volatile (
\\push %%r9
\\push %%r8
\\push $0
\\syscall
\\pop %%r11
\\pop %%r11
\\pop %%r11
: [ret] "={rax}" (-> usize),
: [arg0] "{r8}" (arg0),
[arg1] "{r9}" (arg1),
[syscall_number] "{rbp}" (@enumToInt(sys)),
: "rcx", "rax", "rbp", "r11", "memory"
);
}
pub fn syscall3(sys: plan9.SYS, arg0: usize, arg1: usize, arg2: usize) usize {
return asm volatile (
\\push %%r10
\\push %%r9
\\push %%r8
\\push $0
\\syscall
\\pop %%r11
\\pop %%r11
\\pop %%r11
\\pop %%r11
: [ret] "={rax}" (-> usize),
: [arg0] "{r8}" (arg0),
[arg1] "{r9}" (arg1),
[arg2] "{r10}" (arg2),
[syscall_number] "{rbp}" (@enumToInt(sys)),
: "rcx", "rax", "rbp", "r11", "memory"
);
}
pub fn syscall4(sys: plan9.SYS, arg0: usize, arg1: usize, arg2: usize, arg3: usize) usize {
return asm volatile (
\\push %%r11
@ -16,26 +63,11 @@ pub fn syscall4(sys: plan9.SYS, arg0: usize, arg1: usize, arg2: usize, arg3: usi
\\pop %%r11
\\pop %%r11
: [ret] "={rax}" (-> usize),
// :
: [arg0] "{r8}" (arg0),
[arg1] "{r9}" (arg1),
[arg2] "{r10}" (arg2),
[arg2] "{r11}" (arg3),
[syscall_number] "{rbp}" (@enumToInt(sys)),
: "rcx", "rbp", "r11", "memory"
);
}
pub fn syscall1(sys: plan9.SYS, arg0: usize) void {
_ = sys;
asm volatile (
\\push %%r8
\\push $0
\\syscall
\\pop %%r11
\\pop %%r11
:
: [syscall_number] "{rbp}" (@enumToInt(sys)),
[arg0] "{r8}" (arg0),
: "rcx", "rbp", "r11", "memory"
: "rcx", "rax", "rbp", "r11", "memory"
);
}