[MIPS] Implementation of sel_ldr for MIPS architecture.

src/trusted/service_runtime/arch/mips/sel_rt.h

+/*
+ * 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.
+ */
+
+/*
+ * NaCl Secure Runtime
+ */
+
+#ifndef __NATIVE_CLIENT_SERVICE_RUNTIME_ARCH_MIPS_SEL_RT_H__
+#define __NATIVE_CLIENT_SERVICE_RUNTIME_ARCH_MIPS_SEL_RT_H__ 1
+
+#if !defined(__ASSEMBLER__)
+
+#include <stddef.h>
+
+#include "native_client/src/include/nacl_macros.h"
+#include "native_client/src/include/portability.h"
+#include "native_client/src/shared/platform/nacl_check.h"
+
+uint32_t NaClGetStackPtr(void);
+uint32_t NaClGetGlobalPtr(void);
+
+typedef uint32_t nacl_reg_t;
+
+#define NACL_PRIdNACL_REG NACL_PRId32
+#define NACL_PRIiNACL_REG NACL_PRIi32
+#define NACL_PRIoNACL_REG NACL_PRIo32
+#define NACL_PRIuNACL_REG NACL_PRIu32
+#define NACL_PRIxNACL_REG NACL_PRIx32
+#define NACL_PRIXNACL_REG NACL_PRIX32
+
+/*
+ * NOTE: This struct needs to be synchronized with NACL_CALLEE_SAVE_LIST
+ */
+
+struct NaClThreadContext {
+  nacl_reg_t  s0, s1, s2, s3, s4, s5, s6, s7, t8;
+  /*           0   4   8   c  10  14  18  1c  20 */
+
+  nacl_reg_t  global_ptr, stack_ptr, frame_ptr, prog_ctr;
+  /*                  24         28         2c        30 */
+
+  /*
+   * sys_ret and new_prog_ctr are not a part of the thread's register set,
+   * but are needed by NaClSwitch. By including them here, the two
+   * use the same interface.
+   */
+  uint32_t  sysret;
+  /*            34 */
+  uint32_t  new_prog_ctr;
+  /*            38 */
+  uint32_t  trusted_stack_ptr;
+  /*            3c */
+  uint32_t  tls_idx;
+  /*            40 */
+};
+
+#endif /* !defined(__ASSEMBLER__) */
+
+#define NACL_THREAD_CONTEXT_OFFSET_S0                  0x00
+#define NACL_THREAD_CONTEXT_OFFSET_S1                  0x04
+#define NACL_THREAD_CONTEXT_OFFSET_S2                  0x08
+#define NACL_THREAD_CONTEXT_OFFSET_S3                  0x0c
+#define NACL_THREAD_CONTEXT_OFFSET_S4                  0x10
+#define NACL_THREAD_CONTEXT_OFFSET_S5                  0x14
+#define NACL_THREAD_CONTEXT_OFFSET_S6                  0x18
+#define NACL_THREAD_CONTEXT_OFFSET_S7                  0x1c
+#define NACL_THREAD_CONTEXT_OFFSET_T8                  0x20
+#define NACL_THREAD_CONTEXT_OFFSET_GLOBAL_PTR          0x24
+#define NACL_THREAD_CONTEXT_OFFSET_STACK_PTR           0x28
+#define NACL_THREAD_CONTEXT_OFFSET_FRAME_PTR           0x2c
+#define NACL_THREAD_CONTEXT_OFFSET_PROG_CTR            0x30
+#define NACL_THREAD_CONTEXT_OFFSET_SYSRET              0x34
+#define NACL_THREAD_CONTEXT_OFFSET_NEW_PROG_CTR        0x38
+#define NACL_THREAD_CONTEXT_OFFSET_TRUSTED_STACK_PTR   0x3c
+#define NACL_THREAD_CONTEXT_OFFSET_TLS_IDX             0x40
+
+#if !defined(__ASSEMBLER__)
+
+/*
+ * This function exists as a function only because compile-time
+ * assertions need to be inside a function.  This function does not
+ * need to be called for the assertions to be checked.
+ */
+static INLINE void NaClThreadContextOffsetCheck(void) {
+  int offset = 0;
+
+#define NACL_CHECK_FIELD(offset_name, field) \
+    NACL_COMPILE_TIME_ASSERT(offset_name == \
+                             offsetof(struct NaClThreadContext, field)); \
+    CHECK(offset == offset_name); \
+    offset += sizeof(((struct NaClThreadContext *) NULL)->field);
+
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S0, s0);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S1, s1);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S2, s2);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S3, s3);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S4, s4);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S5, s5);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S6, s6);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_S7, s7);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_T8, t8);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_GLOBAL_PTR, global_ptr);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_STACK_PTR, stack_ptr);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_FRAME_PTR, frame_ptr);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_PROG_CTR, prog_ctr);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_SYSRET, sysret);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_NEW_PROG_CTR, new_prog_ctr);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_TRUSTED_STACK_PTR,
+                   trusted_stack_ptr);
+  NACL_CHECK_FIELD(NACL_THREAD_CONTEXT_OFFSET_TLS_IDX, tls_idx);
+  CHECK(offset == sizeof(struct NaClThreadContext));
+
+#undef NACL_CHECK_FIELD
+
+}
+
+#endif /* !defined(__ASSEMBLER__) */
+
+#endif /* __NATIVE_CLIENT_SERVICE_RUNTIME_ARCH_MIPS_SEL_RT_H___ */