Auto merge of #111819 - nikarh:vita-improved, r=Amanieu

Improved std support for ps vita target

Fixed a couple of things in std support for ps vita via Vita SDK newlib oss implementation:

- Added missing hardware features to target spec
- Compile in thumb by default (newlib is also compiled in thumb)
- Fixed fs calls. Vita newlib has a not-very-posix dirent. Also vita does not expose inodes, it's stubbed as 0 in stat, and I'm stubbing it here for dirent (because vita newlibs's dirent doesn't even have that field)
- Enabled signal handlers for panic unwinding
- Dropped static link requirement from the platform support md. Also, rearranged sections to better stick with the template.

compiler/rustc_target/src/spec/armv7_sony_vita_newlibeabihf.rs

@@ -1,15 +1,18 @@
 use crate::abi::Endian;
-use crate::spec::{cvs, Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
+use crate::spec::{cvs, Cc, LinkerFlavor, Lld, RelocModel, Target, TargetOptions};
 
 /// A base target for PlayStation Vita devices using the VITASDK toolchain (using newlib).
 ///
 /// Requires the VITASDK toolchain on the host system.
 
 pub fn target() -> Target {
-    let pre_link_args = TargetOptions::link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-Wl,-q"]);
+    let pre_link_args = TargetOptions::link_args(
+        LinkerFlavor::Gnu(Cc::Yes, Lld::No),
+        &["-Wl,-q", "-Wl,--pic-veneer"],
+    );
 
     Target {
-        llvm_target: "armv7a-vita-eabihf".into(),
+        llvm_target: "thumbv7a-vita-eabihf".into(),
         pointer_width: 32,
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
         arch: "arm".into(),
@@ -18,21 +21,19 @@ pub fn target() -> Target {
             os: "vita".into(),
             endian: Endian::Little,
             c_int_width: "32".into(),
-            dynamic_linking: false,
             env: "newlib".into(),
             vendor: "sony".into(),
             abi: "eabihf".into(),
             linker_flavor: LinkerFlavor::Gnu(Cc::Yes, Lld::No),
             no_default_libraries: false,
             cpu: "cortex-a9".into(),
-            executables: true,
             families: cvs!["unix"],
             linker: Some("arm-vita-eabi-gcc".into()),
             relocation_model: RelocModel::Static,
-            features: "+v7,+neon".into(),
+            features: "+v7,+neon,+vfp3,+thumb2,+thumb-mode".into(),
             pre_link_args,
             exe_suffix: ".elf".into(),
-            panic_strategy: PanicStrategy::Abort,
+            has_thumb_interworking: true,
             max_atomic_width: Some(64),
             ..Default::default()
         },