ucontext_t is missing on aarch64-unknown-freebsd

[jbeich]

2e3999d added mcontext_t but not ucontext_t. FreeBSD ucontext_t is machine-independent but libc crate limits it by target_arch.

See ucontext_t definition vs. mcontext_t definition

error[E0412]: cannot find type `ucontext_t` in crate `libc`
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:219:57
    |
219 |               let ucontext = &mut *(context as *mut libc::ucontext_t);
    |                                                           ^^^^^^^^^^ help: a struct with a similar name exists: `mcontext_t`
    |
   ::: veloren-4b6c5f57e3a9/cargo-crates/libc-0.2.133/src/unix/bsd/freebsdlike/freebsd/aarch64.rs:20:1
    |
20  | / s_no_extra_traits! {
21  | |     pub struct gpregs {
22  | |         pub gp_x: [::register_t; 30],
23  | |         pub gp_lr: ::register_t,
..   |
44  | |     }
45  | | }
    | |_- similarly named struct `mcontext_t` defined here

error[E0412]: cannot find type `ucontext_t` in crate `libc`
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:259:45
    |
259 |           unsafe fn get_pc_sp(context: &libc::ucontext_t) -> (usize, usize) {
    |                                               ^^^^^^^^^^ help: a struct with a similar name exists: `mcontext_t`
    |
   ::: veloren-4b6c5f57e3a9/cargo-crates/libc-0.2.133/src/unix/bsd/freebsdlike/freebsd/aarch64.rs:20:1
    |
20  | / s_no_extra_traits! {
21  | |     pub struct gpregs {
22  | |         pub gp_x: [::register_t; 30],
23  | |         pub gp_lr: ::register_t,
..   |
44  | |     }
45  | | }
    | |_- similarly named struct `mcontext_t` defined here

error[E0412]: cannot find type `ucontext_t` in crate `libc`
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:314:54
    |
314 |           unsafe fn update_context(context: &mut libc::ucontext_t, regs: TrapHandlerRegs) {
    |                                                        ^^^^^^^^^^ help: a struct with a similar name exists: `mcontext_t`
    |
   ::: veloren-4b6c5f57e3a9/cargo-crates/libc-0.2.133/src/unix/bsd/freebsdlike/freebsd/aarch64.rs:20:1
    |
20  | / s_no_extra_traits! {
21  | |     pub struct gpregs {
22  | |         pub gp_x: [::register_t; 30],
23  | |         pub gp_lr: ::register_t,
..   |
44  | |     }
45  | | }
    | |_- similarly named struct `mcontext_t` defined here

error[E0425]: cannot find value `pc` in this scope
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:420:59
    |
420 |                     context.uc_mcontext.mc_gpregs.gp_pc = pc as libc::register_t;
    |                                                           ^^ not found in this scope

error[E0425]: cannot find value `sp` in this scope
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:421:59
    |
421 |                     context.uc_mcontext.mc_gpregs.gp_sp = sp as libc::register_t;
    |                                                           ^^ not found in this scope

error[E0425]: cannot find value `x0` in this scope
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:422:61
    |
422 |                     context.uc_mcontext.mc_gpregs.gp_x[0] = x0 as libc::register_t;
    |                                                             ^^ not found in this scope

error[E0425]: cannot find value `x1` in this scope
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:423:61
    |
423 |                     context.uc_mcontext.mc_gpregs.gp_x[1] = x1 as libc::register_t;
    |                                                             ^^ not found in this scope

error[E0425]: cannot find value `x29` in this scope
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:424:62
    |
424 |                     context.uc_mcontext.mc_gpregs.gp_x[29] = x29 as libc::register_t;
    |                                                              ^^^ not found in this scope

error[E0425]: cannot find value `lr` in this scope
   --> veloren-4b6c5f57e3a9/cargo-crates/wasmer-vm-2.3.0/src/trap/traphandlers.rs:425:62
    |
425 |                     context.uc_mcontext.mc_gpregs.gp_x[30] = lr as libc::register_t;
    |                                                              ^^ not found in this scope

Some errors have detailed explanations: E0412, E0425.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `wasmer-vm` due to 9 previous errors

[tgross35]

Thanks for the report, feel free to put up a PR for this!

[jbeich]

libc-0.2 branch is still affected. What consumers are expected to do?

[tgross35]

libc-0.2 branch is still affected. What consumers are expected to do?

The PR just didn't make the most recent backport. There are backports and new releases every couple weeks, it should be in the next one.