[MIPS] Implementation of sel_ldr for MIPS architecture.

src/trusted/service_runtime/posix/nacl_signal.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <errno.h>
 #include <signal.h>
 #include <stddef.h>
 #include <string.h>
@@ skipping 28 matching lines @@
  * TODO(noelallen) split these macros and conditional compiles
  * into architecture specific files. Bug #955
  */
 
 /* Use 4K more than the minimum to allow breakpad to run. */
 #define SIGNAL_STACK_SIZE (SIGSTKSZ + 4096)
 #define STACK_GUARD_SIZE NACL_PAGESIZE
 
 static int s_Signals[] = {
 #if NACL_LINUX
+# if NACL_ARCH(NACL_BUILD_ARCH) != NACL_mips
+  /* This signal does not exist on MIPS. */
   SIGSTKFLT,
+# endif
   NACL_THREAD_SUSPEND_SIGNAL,
 #endif
   SIGINT, SIGQUIT, SIGILL, SIGTRAP, SIGBUS, SIGFPE, SIGSEGV
 };
 
 static struct sigaction s_OldActions[NACL_ARRAY_SIZE_UNSAFE(s_Signals)];
 
 int NaClSignalStackAllocate(void **result) {
   /*
    * We use mmap() to allocate the signal stack for two reasons:
@@ skipping 193 matching lines @@
    * future, we might want to allow the stack to be unwound past the
    * exception frame, and so we might want to treat %rbp differently.
    */
   regs->rbp = nap->mem_start;
 #elif NACL_ARCH(NACL_BUILD_ARCH) == NACL_arm
   frame->context.frame_ptr = regs->r11;
   regs->lr = kReturnAddr;
   regs->r0 = context_user_addr;  /* Argument 1 */
   regs->prog_ctr = NaClUserToSys(nap, nap->exception_handler);
   regs->stack_ptr = NaClUserToSys(nap, new_stack_ptr);
+#elif NACL_ARCH(NACL_BUILD_ARCH) == NACL_mips
+  frame->context.frame_ptr = regs->frame_ptr;
+  regs->return_addr = kReturnAddr;
+  regs->a0 = context_user_addr;
+  regs->prog_ctr = NaClUserToSys(nap, nap->exception_handler);
+  regs->stack_ptr = NaClUserToSys(nap, new_stack_ptr);
 #else
 # error Unsupported architecture
 #endif
 
 #if NACL_ARCH(NACL_BUILD_ARCH) == NACL_x86
   frame->return_addr = kReturnAddr;
   regs->flags &= ~NACL_X86_DIRECTION_FLAG;
 #endif
 
   return 1;
@@ skipping 139 matching lines @@
     }
     if ((sa.sa_flags & SA_SIGINFO) != 0
         ? sa.sa_sigaction != NULL
         : (sa.sa_handler != SIG_DFL && sa.sa_handler != SIG_IGN)) {
       NaClLog(LOG_FATAL, "NaClSignalAssertNoHandlers: "
               "A signal handler is registered for signal %d.  "
               "Did Breakpad register this?\n", signum);
     }
   }
 }