[compiler-rt] [compiler-rt] Implement `DumpAllRegisters` for arm-linux and aarch64-linux (PR #99613)

[Vitaly Buka via llvm-commits]

================
@@ -2172,15 +2172,118 @@ static const char *RegNumToRegName(int reg) {
       return "ebp";
     case REG_ESP:
       return "esp";
+#    elif defined(__arm__)
+#      define REG_STR(reg) #reg
+#      define MAKE_CASE(N) \
+        case REG_R##N:     \
+          return REG_STR(r##N)
+    MAKE_CASE(0);
+    MAKE_CASE(1);
+    MAKE_CASE(2);
+    MAKE_CASE(3);
+    MAKE_CASE(4);
+    MAKE_CASE(5);
+    MAKE_CASE(6);
+    MAKE_CASE(7);
+    MAKE_CASE(8);
+    MAKE_CASE(9);
+    MAKE_CASE(10);
+    MAKE_CASE(11);
+    MAKE_CASE(12);
+    case REG_R13:
+      return "sp";
+    case REG_R14:
+      return "lr";
+    case REG_R15:
+      return "pc";
+#    elif defined(__aarch64__)
+#      define REG_STR(reg) #reg
+#      define MAKE_CASE(N) \
+        case N:            \
+          return REG_STR(x##N)
+    MAKE_CASE(0);
+    MAKE_CASE(1);
+    MAKE_CASE(2);
+    MAKE_CASE(3);
+    MAKE_CASE(4);
+    MAKE_CASE(5);
+    MAKE_CASE(6);
+    MAKE_CASE(7);
+    MAKE_CASE(8);
+    MAKE_CASE(9);
+    MAKE_CASE(10);
+    MAKE_CASE(11);
+    MAKE_CASE(12);
+    MAKE_CASE(13);
+    MAKE_CASE(14);
+    MAKE_CASE(15);
+    MAKE_CASE(16);
+    MAKE_CASE(17);
+    MAKE_CASE(18);
+    MAKE_CASE(19);
+    MAKE_CASE(20);
+    MAKE_CASE(21);
+    MAKE_CASE(22);
+    MAKE_CASE(23);
+    MAKE_CASE(24);
+    MAKE_CASE(25);
+    MAKE_CASE(26);
+    MAKE_CASE(27);
+    MAKE_CASE(28);
+    case 29:
+      return "fp";
+    case 30:
+      return "lr";
+    case 31:
+      return "sp";
 #    endif
-#  endif
     default:
       return NULL;
   }
   return NULL;
 }
 
-#  if SANITIZER_LINUX
+#    if SANITIZER_LINUX && (defined(__arm__) || defined(__aarch64__))
+static unsigned long GetArmRegister(ucontext_t *ctx, int RegNum) {
----------------
vitalybuka wrote:


__aarch64__ format specifier expects 'unsigned long long'

So `unsigned long` -> `uptr`, and `zx` for format for both platforms should work

https://github.com/llvm/llvm-project/pull/99613