Add support for Arm64EC

Author: dpaoliello

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         rust_toolchain: [nightly, stable, 1.63.0]
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-latest, windows-latest, macOS-latest, windows-11-arm]
         mode: ["--release", "-Zminimal-versions", ""]
         manifest: ["psm/Cargo.toml", "Cargo.toml"]
         exclude:
@@ -57,6 +57,8 @@ jobs:
         rust_target:
           - x86_64-pc-windows-msvc
           - i686-pc-windows-msvc
+          - aarch64-pc-windows-msvc
+          - arm64ec-pc-windows-msvc
         include:
           - rust_target: x86_64-pc-windows-msvc
             clang_cl: C:/msys64/mingw64/bin/clang-cl.exe

Cargo.toml

@@ -35,4 +35,4 @@ features = [
 
 
 [build-dependencies]
-cc = "1.1.22"
+cc = "1.2.33"

psm/build.rs

@@ -28,6 +28,7 @@ fn find_assembly(
             Some(("src/arch/x86_64_windows_gnu.s", false))
         }
         ("arm", _, "windows", "msvc") => Some(("src/arch/arm_armasm.asm", false)),
+        ("arm64ec", _, "windows", "msvc") => Some(("src/arch/arm64ec_armasm.asm", false)),
         ("aarch64", _, "windows", _) => {
             if masm {
                 Some(("src/arch/aarch64_armasm.asm", false))

psm/src/arch/arm64ec_armasm.asm

@@ -0,0 +1,38 @@
+    AREA |.text|, CODE, READONLY
+
+    GLOBAL |#rust_psm_stack_direction|
+    ALIGN 4
+|#rust_psm_stack_direction| PROC
+    orr w0, wzr, #2
+    ret
+    ENDP
+
+
+    GLOBAL |#rust_psm_stack_pointer|
+    ALIGN 4
+|#rust_psm_stack_pointer| PROC
+    mov x0, sp
+    ret
+    ENDP
+
+
+    GLOBAL |#rust_psm_replace_stack|
+    ALIGN 4
+|#rust_psm_replace_stack| PROC
+    mov sp, x2
+    br x1
+    ENDP
+
+    GLOBAL |#rust_psm_on_stack|
+    ALIGN 4
+|#rust_psm_on_stack| PROC
+    stp x29, x30, [sp, #-16]!
+    mov x29, sp
+    mov sp, x3
+    blr x2
+    mov sp, x29
+    ldp x29, x30, [sp], #16
+    ret
+    ENDP
+
+    END