Merge pull request #25600 from alexrp/std-debug-more-arches

`std.debug`: add CPU contexts and DWARF mappings for more architectures

lib/std/debug.zig

@@ -872,10 +872,14 @@ const StackIterator = union(enum) {
     };
 
     const fp_usability: FpUsability = switch (builtin.target.cpu.arch) {
+        .avr,
+        .csky,
         .mips,
         .mipsel,
         .mips64,
         .mips64el,
+        .msp430,
+        .xcore,
         => .useless,
         .hexagon,
         // The PowerPC ABIs don't actually strictly require a backchain pointer; they allow omitting

lib/std/debug/Dwarf.zig

@@ -1430,14 +1430,20 @@ pub fn compactUnwindToDwarfRegNumber(unwind_reg_number: u3) !u16 {
 pub fn ipRegNum(arch: std.Target.Cpu.Arch) ?u16 {
     return switch (arch) {
         .aarch64, .aarch64_be => 32,
+        .arc => 160,
         .arm, .armeb, .thumb, .thumbeb => 15,
+        .csky => 64,
         .hexagon => 76,
+        .lanai => 2,
         .loongarch32, .loongarch64 => 64,
+        .m68k => 26,
         .mips, .mipsel, .mips64, .mips64el => 66,
+        .or1k => 35,
         .powerpc, .powerpcle, .powerpc64, .powerpc64le => 67,
         .riscv32, .riscv32be, .riscv64, .riscv64be => 65,
         .s390x => 65,
         .sparc, .sparc64 => 32,
+        .ve => 144,
         .x86 => 8,
         .x86_64 => 16,
         else => null,
@@ -1447,14 +1453,20 @@ pub fn ipRegNum(arch: std.Target.Cpu.Arch) ?u16 {
 pub fn fpRegNum(arch: std.Target.Cpu.Arch) u16 {
     return switch (arch) {
         .aarch64, .aarch64_be => 29,
+        .arc => 27,
         .arm, .armeb, .thumb, .thumbeb => 11,
+        .csky => 14,
         .hexagon => 30,
+        .lanai => 5,
         .loongarch32, .loongarch64 => 22,
+        .m68k => 14,
         .mips, .mipsel, .mips64, .mips64el => 30,
+        .or1k => 2,
         .powerpc, .powerpcle, .powerpc64, .powerpc64le => 1,
         .riscv32, .riscv32be, .riscv64, .riscv64be => 8,
         .s390x => 11,
         .sparc, .sparc64 => 30,
+        .ve => 9,
         .x86 => 5,
         .x86_64 => 6,
         else => unreachable,
@@ -1464,14 +1476,20 @@ pub fn fpRegNum(arch: std.Target.Cpu.Arch) u16 {
 pub fn spRegNum(arch: std.Target.Cpu.Arch) u16 {
     return switch (arch) {
         .aarch64, .aarch64_be => 31,
+        .arc => 28,
         .arm, .armeb, .thumb, .thumbeb => 13,
+        .csky => 14,
         .hexagon => 29,
+        .lanai => 4,
         .loongarch32, .loongarch64 => 3,
+        .m68k => 15,
         .mips, .mipsel, .mips64, .mips64el => 29,
+        .or1k => 1,
         .powerpc, .powerpcle, .powerpc64, .powerpc64le => 1,
         .riscv32, .riscv32be, .riscv64, .riscv64be => 2,
         .s390x => 15,
         .sparc, .sparc64 => 14,
+        .ve => 11,
         .x86 => 4,
         .x86_64 => 7,
         else => unreachable,

lib/std/debug/SelfInfo/Elf.zig

@@ -94,22 +94,27 @@ pub const can_unwind: bool = s: {
     // Notably, we are yet to support unwinding on ARM. There, unwinding is not done through
     // `.eh_frame`, but instead with the `.ARM.exidx` section, which has a different format.
     const archs: []const std.Target.Cpu.Arch = switch (builtin.target.os.tag) {
-        // Not supported yet: arm, m68k
+        // Not supported yet: arm
         .haiku => &.{
             .aarch64,
+            .m68k,
             .riscv64,
             .x86,
             .x86_64,
         },
-        // Not supported yet: arc, arm/armeb/thumb/thumbeb, csky, m68k, or1k, xtensa
+        // Not supported yet: arm/armeb/thumb/thumbeb, xtensa
         .linux => &.{
             .aarch64,
             .aarch64_be,
+            .arc,
+            .csky,
             .loongarch64,
+            .m68k,
             .mips,
             .mipsel,
             .mips64,
             .mips64el,
+            .or1k,
             .riscv32,
             .riscv64,
             .s390x,
@@ -131,10 +136,11 @@ pub const can_unwind: bool = s: {
             .riscv64,
             .x86_64,
         },
-        // Not supported yet: arm/armeb, m68k, mips64/mips64el
+        // Not supported yet: arm/armeb, mips64/mips64el
         .netbsd => &.{
             .aarch64,
             .aarch64_be,
+            .m68k,
             .mips,
             .mipsel,
             .x86,