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

This reverts commit ef1c70d.

Unfortunately broke the sanitizer buildbot(s), and the fix-forward
didn't work. More details in
#99613

Author: hctim

compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

@@ -2172,118 +2172,15 @@ 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 && (defined(__arm__) || defined(__aarch64__))
-static uptr GetArmRegister(ucontext_t *ctx, int RegNum) {
-  switch (RegNum) {
-#      if defined(__arm__)
-#        define MAKE_CASE(N) \
-          case REG_R##N:     \
-            return ctx->uc_mcontext.arm_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);
-    case REG_R11:
-      return ctx->uc_mcontext.arm_fp;
-    case REG_R12:
-      return ctx->uc_mcontext.arm_ip;
-    case REG_R13:
-      return ctx->uc_mcontext.arm_sp;
-    case REG_R14:
-      return ctx->uc_mcontext.arm_lr;
-    case REG_R15:
-      return ctx->uc_mcontext.arm_pc;
-#      elif defined(__aarch64__)
-    case 0 ... 30:
-      return ctx->uc_mcontext.regs[RegNum];
-    case 31:
-      return ctx->uc_mcontext.sp;
-#      endif
-    default:
-      return 0;
-  }
-  return 0;
-}
-#    endif  // SANITIZER_LINUX && (defined(__arm__) || defined(__aarch64__))
-
+#  if SANITIZER_LINUX
 UNUSED
 static void DumpSingleReg(ucontext_t *ctx, int RegNum) {
   const char *RegName = RegNumToRegName(RegNum);
@@ -2292,12 +2189,6 @@ static void DumpSingleReg(ucontext_t *ctx, int RegNum) {
          RegName, ctx->uc_mcontext.gregs[RegNum]);
 #    elif defined(__i386__)
   Printf("%s = 0x%08x  ", RegName, ctx->uc_mcontext.gregs[RegNum]);
-#    elif defined(__arm__)
-  Printf("%s%s = 0x%08zx  ", internal_strlen(RegName) == 2 ? " " : "", RegName,
-         GetArmRegister(ctx, RegNum));
-#    elif defined(__aarch64__)
-  Printf("%s%s = 0x%016zx  ", internal_strlen(RegName) == 2 ? " " : "", RegName,
-         GetArmRegister(ctx, RegNum));
 #    else
   (void)RegName;
 #    endif
@@ -2345,35 +2236,6 @@ void SignalContext::DumpAllRegisters(void *context) {
   DumpSingleReg(ucontext, REG_EBP);
   DumpSingleReg(ucontext, REG_ESP);
   Printf("\n");
-#    elif defined(__arm__)
-  Report("Register values:\n");
-  DumpSingleReg(ucontext, REG_R0);
-  DumpSingleReg(ucontext, REG_R1);
-  DumpSingleReg(ucontext, REG_R2);
-  DumpSingleReg(ucontext, REG_R3);
-  Printf("\n");
-  DumpSingleReg(ucontext, REG_R4);
-  DumpSingleReg(ucontext, REG_R5);
-  DumpSingleReg(ucontext, REG_R6);
-  DumpSingleReg(ucontext, REG_R7);
-  Printf("\n");
-  DumpSingleReg(ucontext, REG_R8);
-  DumpSingleReg(ucontext, REG_R9);
-  DumpSingleReg(ucontext, REG_R10);
-  DumpSingleReg(ucontext, REG_R11);
-  Printf("\n");
-  DumpSingleReg(ucontext, REG_R12);
-  DumpSingleReg(ucontext, REG_R13);
-  DumpSingleReg(ucontext, REG_R14);
-  DumpSingleReg(ucontext, REG_R15);
-  Printf("\n");
-#    elif defined(__aarch64__)
-  Report("Register values:\n");
-  for (int i = 0; i <= 31; ++i) {
-    DumpSingleReg(ucontext, i);
-    if (i % 4 == 3)
-      Printf("\n");
-  }
 #    else
   (void)ucontext;
 #    endif