From 0d947ae87a2280d6f4acec16cf2307d11aed03e2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Sun, 9 Aug 2026 05:08:36 +0200
Subject: [PATCH] std.debug: use a different register number for pc on sparc

Also report the floating-point registers as unsupported rather than invalid.
---
 lib/std/debug/Dwarf.zig       | 2 +-
 lib/std/debug/cpu_context.zig | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/std/debug/Dwarf.zig b/lib/std/debug/Dwarf.zig
index 2d6e2204a340effe84ef4d2c00f1b87ea5cc1a5c..525e9ce078882cc4fb8013762e323579a1d05126 100644
--- a/lib/std/debug/Dwarf.zig
+++ b/lib/std/debug/Dwarf.zig
@@ -1462,7 +1462,7 @@ pub fn ipRegNum(arch: std.Target.Cpu.Arch) ?u16 {
         .powerpc, .powerpcle, .powerpc64, .powerpc64le => 67,
         .riscv32, .riscv32be, .riscv64, .riscv64be => 65,
         .s390x => 65,
-        .sparc, .sparc64 => 32,
+        .sparc, .sparc64 => 65,
         .ve => 144,
         .x86 => 8,
         .x86_64 => 16,
diff --git a/lib/std/debug/cpu_context.zig b/lib/std/debug/cpu_context.zig
index 6579ade9f4ca749170294c5a03cf91a9a4b7e3a8..a0c50743465ccfcc0a68dd91589a6fade3da7e28 100644
--- a/lib/std/debug/cpu_context.zig
+++ b/lib/std/debug/cpu_context.zig
@@ -1613,7 +1613,11 @@ const Sparc = extern struct {
             8...15 => return @ptrCast(&ctx.o[register_num - 8]),
             16...23 => return @ptrCast(&ctx.l[register_num - 16]),
             24...31 => return @ptrCast(&ctx.i[register_num - 24]),
-            32 => return @ptrCast(&ctx.pc),
+            65 => return @ptrCast(&ctx.pc),
+
+            32...63 => return error.UnsupportedRegister, // F0-F31
+            64 => return error.UnsupportedRegister, // Y
+            72...87 => return error.UnsupportedRegister, // D0-D15
 
             else => return error.InvalidRegister,
         }
-- 
2.54.0