kboot: Create function for error checking.

Linux has the convention of returning -ERRNO to flag errors from its
system calls. Sometimes other negative values are returned that are
success... Howeve

kboot: Create function for error checking.

Linux has the convention of returning -ERRNO to flag errors from its
system calls. Sometimes other negative values are returned that are
success... However, only values -1 to -4096 (inclusive) are really
errors. The rest are either truncated values that only look negative (so
use long instead of int), or are things like addresses or legal unsigned
file offsets or similar that are successful returns. Filter out the
latter.

Sponsored by: Netflix

show more ...

kboot: Assert copyright here

According to git blame I've 95%+ rewritten this file. Update copyright to
reflect that, but give nod to Nathan for the original I started with.

Sponsored by: Netflix

kboot: Move system calls to libkboot

Sponsored by: Netflix

kboot: Move to kboot/kboot

In anticipation of separating the library elements from the kboot
prorgam elements, move kboot down a level into a subdirectory. There
will be libkboot and include directo

kboot: Move to kboot/kboot

In anticipation of separating the library elements from the kboot
prorgam elements, move kboot down a level into a subdirectory. There
will be libkboot and include directories in subsequent commits,
mirroring other subsystems like i386 and efi.

Sponsored by: Netflix

show more ...

Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

kboot: Add HOST_MAP_FAILED define

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D39790

kboot: Assert errno is negative

When converting from a Linux error to a FreeBSD errno, assert that the
value passed in is negative, as is Linux's custom.

Suggested by: brooks
Sponsored by: Netfli

kboot: Assert errno is negative

When converting from a Linux error to a FreeBSD errno, assert that the
value passed in is negative, as is Linux's custom.

Suggested by: brooks
Sponsored by: Netflix
Reviewed by: tsoome, brooks
Differential Revision: https://reviews.freebsd.org/D38357

show more ...

kboot: For hostfs, return better errors from read, where possible.

Translate the Linux error return from read to a FreeBSD errno. We use a
simplified translation: 1-34 are the same between the syste

kboot: For hostfs, return better errors from read, where possible.

Translate the Linux error return from read to a FreeBSD errno. We use a
simplified translation: 1-34 are the same between the systems, so any of
those will be returned directly. All other errno map to EINVAL. This
will suffice for some code that reads /dev/mem in producing the right
diagnostic.

A fully generalized version is much harder. Linux has a number of errno
that don't translate well and has architecture dependent
encodings. Avoid this mess with a simple macro for now. Add comment
explaining why we use the simple method we do.

Sponsored by: Netflix
Reviewed by: kevans, andrew
Differential Revision: https://reviews.freebsd.org/D38265

show more ...

stand: Add macros for file types from stat

Add the familiar macros for file types for stat's st_mode
member. Prepend HOST_ to the start of these. Make sure all the values
match the linux nolibc and

stand: Add macros for file types from stat

Add the familiar macros for file types for stat's st_mode
member. Prepend HOST_ to the start of these. Make sure all the values
match the linux nolibc and uapi headers. These values are the same as
native values since they appear to be required by POSIX. Define anyway
to allow the reader of the code to know that they are in the 'host (eg
Linux)' namespace rather than the 'loader' namespace.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D37967

show more ...

stand: aarch64 has different nlinks than amd64

Some typedefs are system dependent, so move them into stat_arch.h where
they are used. On amd64, nlinks is a int64_t, while on aarch64 it's an
int (or

stand: aarch64 has different nlinks than amd64

Some typedefs are system dependent, so move them into stat_arch.h where
they are used. On amd64, nlinks is a int64_t, while on aarch64 it's an
int (or int32_t).

Sponsored by: Netflix

show more ...

kboot: Implement host_ioctl

Sponsored by: Netflix

kboot: Add host_exit and use it to implement exit()

Clients of libsa are expected to implement exit(). The current exit just
loops forever. It is better to really exit: when running as init that
wil

kboot: Add host_exit and use it to implement exit()

Clients of libsa are expected to implement exit(). The current exit just
loops forever. It is better to really exit: when running as init that
will reboot the system. When not running as init, other programs can
recover (not that we support running as init, but when we do in the
future, this is still the rigtht thing).

Sponsored by: Netflix

show more ...

kboot: Convert from getdents to getdents64

Linux 2.4 introduced getdents64. Switch to using it because aarch64
doesn't have getdents as that syscall was obsoleted before that port was
created.

Spon

kboot: Convert from getdents to getdents64

Linux 2.4 introduced getdents64. Switch to using it because aarch64
doesn't have getdents as that syscall was obsoleted before that port was
created.

Sponsored by: Netflix

show more ...

kboot: Pull in constants from Linux's mmap.h api

Define the usual #defines for mmap(2) (with HOST_ prepended) and use
them instead of hard coding constants.

Sponsored by: Netflix

kboot: Refinements to host_kexec_load

Move kexec_segments to host_syscall.h and pre-pend host_ to it. Correct
args to host_exec_load.

Sponsored by: Netflix

kboot: Use #defines for magic reboot constants

Sponsored by: Netflix

kboot: Implement mount(2)

Create a wrapper for the mount system call. To ensure a sane early boot
environment and to gather data we need for kexec, we may need to mount
some special filesystems.

Sp

kboot: Implement mount(2)

Create a wrapper for the mount system call. To ensure a sane early boot
environment and to gather data we need for kexec, we may need to mount
some special filesystems.

Sponsored by: Netflix

show more ...

kboot: Implement mkdir(2)

mkdir() may be needed early in boot to create missing
directories. Provide a syscall wrapper for it.

Sponsored by: Netflix

kboot: Implement dup(2)

Early in boot, we need to create the normal stdin/out/err env for the
boot loader to run in. To do that, we need to open the console and
duplicate the file descriptors which

kboot: Implement dup(2)

Early in boot, we need to create the normal stdin/out/err env for the
boot loader to run in. To do that, we need to open the console and
duplicate the file descriptors which requires dup(2). Implement a
wrapper as host_dup.

Sponsored by: Netflix

show more ...

kboot: Implement symlink(2)

Linux's /dev/fd is implemented inside of /proc/self/fd, so we may need
to create a symlink to it early in boot. "/dev/fd" and "/dev/std*" might
not be strictly required f

kboot: Implement symlink(2)

Linux's /dev/fd is implemented inside of /proc/self/fd, so we may need
to create a symlink to it early in boot. "/dev/fd" and "/dev/std*" might
not be strictly required for the boot loader, but should be present for
maximum flexibility.

Sponsored by: Netflix

show more ...

kboot: Implement getpid(2)

Add host_getpid() so we can know if we're running as init(8) or not. If
we are, we may chose to do early system setup / sanity operations.

Sponsored by: Netflix

kboot: Implement munmap(2)

Define host_munmap so we can use it in the x86 code to find things for
the BIOS/CMS boot path and unmap after we find it.

Sponsored by: Netflix

kboot: Implement stat(2) and fstat(2) system calls

Implement stat(2) and fstat(2) in terms of newfstatat and newfstat
system calls respectively (assume we have a compat #define when
there's no newfs

kboot: Implement stat(2) and fstat(2) system calls

Implement stat(2) and fstat(2) in terms of newfstatat and newfstat
system calls respectively (assume we have a compat #define when
there's no newfstat and just a regular fstat and do so for ppc).

Snag struct kstat (the Linux kernel stat(2), et al interface) from musl
and attribute properly.

Sponsored by: Netflix

show more ...

kboot: Add HOST_O_ constants for open, etc

Add the common O_ constants for the open, fcntl, etc system calls. They
are different than FreeBSD's. While they can differ based on
architecture, they are

kboot: Add HOST_O_ constants for open, etc

Add the common O_ constants for the open, fcntl, etc system calls. They
are different than FreeBSD's. While they can differ based on
architecture, they are constant for architectures we care about, and
those architectures use the 'generic' version so future architectures
will also work.

Sponsored by: Netflix

show more ...

kboot: Reimplement older system calls in terms of newer ones

aarch64 doesn't have open, just openat, etc. Cope.

Sponsored by: Netflix