From 94b6c7ce5f71792b55a0027f831394afa27e3c8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Mon, 10 Nov 2025 06:54:42 +0100
Subject: [PATCH] std.debug.cpu_context: add kvx context implementation

---
 lib/std/debug/cpu_context.zig | 66 +++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/lib/std/debug/cpu_context.zig b/lib/std/debug/cpu_context.zig
index 5fa84f9098..f29cda4036 100644
--- a/lib/std/debug/cpu_context.zig
+++ b/lib/std/debug/cpu_context.zig
@@ -9,6 +9,7 @@ else switch (native_arch) {
     .arm, .armeb, .thumb, .thumbeb => Arm,
     .csky => Csky,
     .hexagon => Hexagon,
+    .kvx => Kvx,
     .lanai => Lanai,
     .loongarch32, .loongarch64 => LoongArch,
     .m68k => M68k,
@@ -493,6 +494,71 @@ const Hexagon = extern struct {
     }
 };
 
+/// This is an `extern struct` so that inline assembly in `current` can use field offsets.
+const Kvx = extern struct {
+    r: [64]u64,
+    ra: u64,
+    pc: u64,
+
+    pub inline fn current() Kvx {
+        var ctx: Kvx = undefined;
+        asm volatile (
+            \\ so (0)[$r32] = $r0r1r2r3
+            \\ ;;
+            \\ so (32)[$r32] = $r4r5r6r7
+            \\ ;;
+            \\ so (64)[$r32] = $r8r9r10r11
+            \\ ;;
+            \\ so (96)[$r32] = $r12r13r14r15
+            \\ ;;
+            \\ so (128)[$r32] = $r16r17r18r19
+            \\ ;;
+            \\ so (160)[$r32] = $r20r21r22r23
+            \\ ;;
+            \\ so (192)[$r32] = $r24r25r26r27
+            \\ ;;
+            \\ so (224)[$r32] = $r28r29r30r31
+            \\ ;;
+            \\ so (256)[$r32] = $r32r33r34r35
+            \\ ;;
+            \\ so (288)[$r32] = $r36r37r38r39
+            \\ ;;
+            \\ so (320)[$r32] = $r40r41r42r43
+            \\ ;;
+            \\ so (352)[$r32] = $r44r45r46r47
+            \\ ;;
+            \\ so (384)[$r32] = $r48r49r50r51
+            \\ ;;
+            \\ so (416)[$r32] = $r52r53r54r55
+            \\ ;;
+            \\ so (448)[$r32] = $r56r57r58r59
+            \\ get $r34 = $pc
+            \\ ;;
+            \\ so (480)[$r32] = $r60r61r62r63
+            \\ get $r35 = $ra
+            \\ ;;
+            \\ sq (512)[$r32] = $r34r35
+            :
+            : [ctx] "{r32}" (&ctx),
+            : .{ .r34 = true, .r35 = true, .memory = true });
+        return ctx;
+    }
+
+    pub fn dwarfRegisterBytes(ctx: *Kvx, register_num: u16) DwarfRegisterError![]u8 {
+        switch (register_num) {
+            0...63 => return @ptrCast(&ctx.r[register_num]),
+            64 => return @ptrCast(&ctx.pc),
+            67 => return @ptrCast(&ctx.ra),
+
+            65...66 => return error.UnsupportedRegister, // SFRs
+            68...255 => return error.UnsupportedRegister, // SFRs
+            256...767 => return error.UnsupportedRegister, // XCRs
+
+            else => return error.InvalidRegister,
+        }
+    }
+};
+
 /// This is an `extern struct` so that inline assembly in `current` can use field offsets.
 const Lanai = extern struct {
     r: [32]u32,