[MIPS] Make $t8 point to the address of TLS pointers

src/tools/tls_edit/tls_edit.c

Index: src/tools/tls_edit/tls_edit.c
diff --git a/src/tools/tls_edit/tls_edit.c b/src/tools/tls_edit/tls_edit.c
index 3df73aa8918a05aeb65529dcd15a549310c76358..1791bf766d57055c83bf8f41ebbdefd35a43657c 100644
--- a/src/tools/tls_edit/tls_edit.c
+++ b/src/tools/tls_edit/tls_edit.c
@@ -40,6 +40,23 @@ static void ReportError(const void *insn, const char *message) {
   ++g_errors;
 }
 
+static void EditMipsCode(void *code, size_t code_length) {

[Mark Seaborn, 2016/01/11 22:19:28]

Nit: can you order this after EditArmCode()?

[petarj, 2016/01/11 23:21:38]

Done.

+  Elf32_Word *const words = code;
+  Elf32_Word *const end = (void *) ((uint8_t *) code + code_length);
+  Elf32_Word *insn;
+
+  for (insn = words; insn < end; ++insn) {
+    if ((*insn & 0xFFE0FFFF) == 0x8f000000) {
+      /*
+       * This is 'lw $REG, 0($t8)'.
+       * Turn it into 'lw $REG, 4($t8)'.
+       */
+      *insn |= 4;
+      ++g_changes;
+    }
+  }
+}
+
 static void EditArmCode(void *code, size_t code_length) {
   Elf32_Word *const words = code;
   Elf32_Word *const end = (void *) ((uint8_t *) code + code_length);
@@ -189,10 +206,7 @@ static Bool EditTLSCode(const char *infile, uint32_t code_addr,
       }
       return TRUE;
     case EM_MIPS:
-      if (g_verbose) {
-        printf("%s: MIPS ELF detected, no instructions changed\n",
-               infile);
-      }
+      EditMipsCode(g_code_start, code_length);
       return TRUE;
     default:
       fprintf(stderr, "%s: Unsupported e_machine %d\n",