See also arch/loongarch/include/uapi/asm/hwcap.h in Linux kernel.
SC.Q was added in kernel v7.0.
Change-Id: Ib4ddd451ab16d52b2578f8b97c9c3365286719cd
Signed-off-by: xtex <xtex@astrafall.org>
Even though these registry mentions are supposed to be in a comment they
seem to still be interpreted by gcc.
Alternatively one could try to make zig not include comments in assembly
blocks when generating C code.
In function 'os_linux_x86_syscall6__6685',
inlined from 'os_linux_copy_file_range__4300' at zig2.c:396643:7,
inlined from 'link_MappedFile_copyFileRange__14079.isra' at zig2.c:289222:10:
zig2.c:396692:2: error: invalid 'asm': operand number missing after %-letter
396692 | __asm volatile(" push %[args56]\n push %%ebp\n mov 4(%%esp), %%ebp\n mov %%edi, 4(%%esp)\n // The saved %edi and %ebp are on the stack, and %ebp points to `args56`.\n // Prepare the last two args, syscall, then pop the saved %ebp and %edi.\n mov (%%ebp), %%edi\n mov 4(%%ebp), %%ebp\n int $0x80\n pop %%ebp\n pop %%edi": [ret]"=r"(t5): [number]"r"(t6), [arg1]"r"(t7), [arg2]"r"(t8), [arg3]"r"(t9), [arg4]"r"(t10), [args56]"rm"(t2): "memory");
| ^~~~~
zig2.c:396692:2: error: invalid 'asm': operand number missing after %-letter
zig2.c:396692:2: error: invalid 'asm': operand number missing after %-letter
zig2.c:396692:2: error: invalid 'asm': operand number missing after %-letter
zig2.c:396692:2: error: invalid 'asm': operand number missing after %-letter
This required a thorough audit of every syscall wrapper in std.os.linux, so
while I was here, I fixed some minor arch-specific bugs, improved some types,
simplified some casts, and deleted some dead code.
Note that lseek() in particular is still broken for n32 and x32 after this
commit; this wrapper will require some special-casing in the arch bits due to
its unusual return type width.
closes https://github.com/ziglang/zig/issues/22464
closes https://codeberg.org/ziglang/zig/issues/31597
Importantly, adds ability to get Clock resolution, which may be zero.
This allows error.Unexpected and error.ClockUnsupported to be removed
from timeout and clock reading error sets.
The 6.17 kernel added[1] syscalls for getting/setting certain file flags
and attributes. It's meant to be a more extensible replacement for these
ioctl's:
- `FS_IOC_GETFLAGS`/`FS_IOC_SETFLAGS`.
- `FS_IOC_FSGETXATTR`/`FS_IOC_FSSETXATTR`.
The definitions of these calls are as follows:
```zig
const file_attr = extern struct {
/// Extended flags that apply to this file. (get/set).
xflags: u64,
/// Preferred extent allocation size, in bytes. (get/set).
extsize: u32,
/// One of:
/// - The number of data extents in this file.
/// - If `FS_IOC_FSGETXATTRA` is set, the number of extended attribute events in the file.
/// (get)
nextents: u32,
/// Project Identifier (get/set).
projid: u32,
/// Preferred extent allocation size for CoW operations, in bytes (get/set).
cowextsize: u32,
};
// size=@sizeOf(file_attr)
fn file_getattr(dirfd: fd_t, path: [*:0], fattr: *file_attr, size: usize, at_flags: u32) {}
fn file_setattr(dirfd: fd_t, path: [*:0], fattr: *file_attr, size: usize, at_flags: u32) {}
```
Users need to set/check `xflags` with the `FS_XFLAG` flags defined in
`linux/fs.h`. `ioctl_xfs_fsgetxattr(2)` has more information about the
type of information one can retrieve.
[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=57fcb7d930d8f00f383e995aeebdcd2b416a187a
Alex Rønne Petersen