[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 "native_client/src/include/portability.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  t6, t7, s0, s1, s2, s3, s4, s5, s6, s7, t8,
+  /*           0   4   8   c  10  14  18  1c  20  24  28 */
+
+        global_ptr,   stack_ptr,   frame_ptr,   prog_ctr;

[Mark Seaborn, 2012/09/13 19:44:36]

Nit: start this with nacl_reg_t so that we don't have variable declarations
spanning lines (which looks odd given the index comments)

[petarj, 2012/09/18 00:22:15]

Done.

+  /*       2c            30           34           38    */
+
+  /*
+   * 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;
+  /*            3c */
+  uint32_t  new_prog_ctr;
+  /*            40 */
+  uint32_t  trusted_stack_ptr;
+  /*            44 */
+  uint32_t  tls_idx;
+  /*            48 */
+};
+
+#endif /* !defined(__ASSEMBLER__) */
+
+#define NACL_THREAD_CONTEXT_OFFSET_T6           0x00
+#define NACL_THREAD_CONTEXT_OFFSET_T7           0x04
+#define NACL_THREAD_CONTEXT_OFFSET_S0           0x08
+#define NACL_THREAD_CONTEXT_OFFSET_S1           0x0c
+#define NACL_THREAD_CONTEXT_OFFSET_S2           0x10
+#define NACL_THREAD_CONTEXT_OFFSET_S3           0x14
+#define NACL_THREAD_CONTEXT_OFFSET_S4           0x18
+#define NACL_THREAD_CONTEXT_OFFSET_S5           0x1c
+#define NACL_THREAD_CONTEXT_OFFSET_S6           0x20
+#define NACL_THREAD_CONTEXT_OFFSET_S7           0x24
+#define NACL_THREAD_CONTEXT_OFFSET_T8           0x28
+#define NACL_THREAD_CONTEXT_OFFSET_GP           0x2c

[Mark Seaborn, 2012/09/13 19:44:36]

Can you make the #define names match the field names, please?  So either rename
the field to "gp", or (preferably) rename this to
NACL_THREAD_CONTEXT_OFFSET_GLOBAL_PTR?

[petarj, 2012/09/18 00:22:15]

Done.

+#define NACL_THREAD_CONTEXT_OFFSET_SP           0x30
+#define NACL_THREAD_CONTEXT_OFFSET_FP           0x34
+
+#endif /* __NATIVE_CLIENT_SERVICE_RUNTIME_ARCH_MIPS_SEL_RT_H___ */