[MIPS] Implementation of sel_ldr for MIPS architecture.

src/trusted/service_runtime/linux/nacl_signal_mips.c

+/*
+ * Copyright 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 <signal.h>
+#include <sys/ucontext.h>
+
+#include "native_client/src/trusted/service_runtime/nacl_signal.h"
+
+/*
+ * Fill a signal context structure from the raw platform dependent
+ * signal information.
+ */
+void NaClSignalContextFromHandler(struct NaClSignalContext *sigCtx,
+                                  const void *rawCtx) {
+  /*
+   * TODO(petarj): Check whether float registers should be added here.
+   */
+  ucontext_t *uctx = (ucontext_t *) rawCtx;
+  mcontext_t *mctx = &uctx->uc_mcontext;
+
+  sigCtx->prog_ctr = mctx->pc;
+
+  sigCtx->zero = mctx->gregs[0];
+  sigCtx->at = mctx->gregs[1];
+  sigCtx->v0 = mctx->gregs[2];
+  sigCtx->v1 = mctx->gregs[3];
+  sigCtx->a0 = mctx->gregs[4];
+  sigCtx->a1 = mctx->gregs[5];
+  sigCtx->a2 = mctx->gregs[6];
+  sigCtx->a3 = mctx->gregs[7];
+  sigCtx->t0 = mctx->gregs[8];
+  sigCtx->t1 = mctx->gregs[9];
+  sigCtx->t2 = mctx->gregs[10];
+  sigCtx->t3 = mctx->gregs[11];
+  sigCtx->t4 = mctx->gregs[12];
+  sigCtx->t5 = mctx->gregs[13];
+  sigCtx->t6 = mctx->gregs[14];
+  sigCtx->t7 = mctx->gregs[15];
+  sigCtx->s0 = mctx->gregs[16];
+  sigCtx->s1 = mctx->gregs[17];
+  sigCtx->s2 = mctx->gregs[18];
+  sigCtx->s3 = mctx->gregs[19];
+  sigCtx->s4 = mctx->gregs[20];
+  sigCtx->s5 = mctx->gregs[21];
+  sigCtx->s6 = mctx->gregs[22];
+  sigCtx->s7 = mctx->gregs[23];
+  sigCtx->t8 = mctx->gregs[24];
+  sigCtx->t9 = mctx->gregs[25];
+  sigCtx->k0 = mctx->gregs[26];
+  sigCtx->k1 = mctx->gregs[27];
+  sigCtx->global_ptr = mctx->gregs[28];
+  sigCtx->stack_ptr = mctx->gregs[29];
+  sigCtx->frame_ptr = mctx->gregs[30];
+  sigCtx->return_addr = mctx->gregs[31];
+}
+
+
+/*
+ * Update the raw platform dependent signal information from the
+ * signal context structure.
+ */
+void NaClSignalContextToHandler(void *rawCtx,
+                                const struct NaClSignalContext *sigCtx) {
+  ucontext_t *uctx = (ucontext_t *) rawCtx;
+  mcontext_t *mctx = &uctx->uc_mcontext;
+
+  mctx->pc = sigCtx->prog_ctr;
+
+  mctx->gregs[0] = sigCtx->zero;
+  mctx->gregs[1] = sigCtx->at;
+  mctx->gregs[2] = sigCtx->v0;
+  mctx->gregs[3] = sigCtx->v1;
+  mctx->gregs[4] = sigCtx->a0;
+  mctx->gregs[5] = sigCtx->a1;
+  mctx->gregs[6] = sigCtx->a2;
+  mctx->gregs[7] = sigCtx->a3;
+  mctx->gregs[8] = sigCtx->t0;
+  mctx->gregs[9] = sigCtx->t1;
+  mctx->gregs[10] = sigCtx->t2;
+  mctx->gregs[11] = sigCtx->t3;
+  mctx->gregs[12] = sigCtx->t4;
+  mctx->gregs[13] = sigCtx->t5;
+  mctx->gregs[14] = sigCtx->t6;
+  mctx->gregs[15] = sigCtx->t7;
+  mctx->gregs[16] = sigCtx->s0;
+  mctx->gregs[17] = sigCtx->s1;
+  mctx->gregs[18] = sigCtx->s2;
+  mctx->gregs[19] = sigCtx->s3;
+  mctx->gregs[20] = sigCtx->s4;
+  mctx->gregs[21] = sigCtx->s5;
+  mctx->gregs[22] = sigCtx->s6;
+  mctx->gregs[23] = sigCtx->s7;
+  mctx->gregs[24] = sigCtx->t8;
+  mctx->gregs[25] = sigCtx->t9;
+  mctx->gregs[26] = sigCtx->k0;
+  mctx->gregs[27] = sigCtx->k1;
+  mctx->gregs[28] = sigCtx->global_ptr;
+  mctx->gregs[29] = sigCtx->stack_ptr;
+  mctx->gregs[30] = sigCtx->frame_ptr;
+  mctx->gregs[31] = sigCtx->return_addr;
+}