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Merge tag 'mips-pull-2019-11-16' of git://git.denx.de/u-boot-mips
[oweals/u-boot.git] / examples / standalone / stubs.c
diff --git a/examples/standalone/stubs.c b/examples/standalone/stubs.c
index 920a0a9cf3b4ae96c2ba3aa21394dde4fd50318b..0827bde35e581b27b9b7d081fef35ae296c4f698 100644 (file)
--- a/examples/standalone/stubs.c
+++ b/examples/standalone/stubs.c
@@ -65,6 +65,23 @@ gd_t *global_data;
        : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "ip");
 #endif
 #elif defined(CONFIG_MIPS)
+#ifdef CONFIG_CPU_MIPS64
+/*
+ * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
+ * clobbered register that is also used to set gp ($26). Note that the
+ * jr instruction also executes the instruction immediately following
+ * it; however, GCC/mips generates an additional `nop' after each asm
+ * statement
+ */
+#define EXPORT_FUNC(f, a, x, ...) \
+       asm volatile (                  \
+"      .globl " #x "\n"                \
+#x ":\n"                               \
+"      ld      $25, %0($26)\n"         \
+"      ld      $25, %1($25)\n"         \
+"      jr      $25\n"                  \
+        : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9");
+#else
 /*
  * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
  * clobbered register that is also used to set gp ($26). Note that the
@@ -80,6 +97,7 @@ gd_t *global_data;
 "      lw      $25, %1($25)\n"         \
 "      jr      $25\n"                  \
        : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9");
+#endif
 #elif defined(CONFIG_NIOS2)
 /*
  * gp holds the pointer to the global_data, r8 is call-clobbered
@@ -123,32 +141,6 @@ gd_t *global_data;
 "      lwi     r5, r5, %1\n"                   \
 "      bra     r5\n"                           \
        : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r5");
-#elif defined(CONFIG_BLACKFIN)
-/*
- * P3 holds the pointer to the global_data, P0 is a call-clobbered
- * register
- */
-#define EXPORT_FUNC(f, a, x, ...)                      \
-       asm volatile (                  \
-"      .globl _" #x "\n_"              \
-#x ":\n"                               \
-"      P0 = [P3 + %0]\n"               \
-"      P0 = [P0 + %1]\n"               \
-"      JUMP (P0)\n"                    \
-       : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "P0");
-#elif defined(CONFIG_AVR32)
-/*
- * r6 holds the pointer to the global_data. r8 is call clobbered.
- */
-#define EXPORT_FUNC(f, a, x, ...)                                      \
-       asm volatile(                                   \
-               "       .globl\t" #x "\n"               \
-               #x ":\n"                                \
-               "       ld.w    r8, r6[%0]\n"           \
-               "       ld.w    pc, r8[%1]\n"           \
-               :                                       \
-               : "i"(offsetof(gd_t, jt)), "i"(FO(x))   \
-               : "r8");
 #elif defined(CONFIG_SH)
 /*
  * r13 holds the pointer to the global_data. r1 is a call clobbered.
@@ -167,21 +159,6 @@ gd_t *global_data;
                "       nop\n"                          \
                "       nop\n"                          \
                : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r1", "r2");
-#elif defined(CONFIG_SPARC)
-/*
- * g7 holds the pointer to the global_data. g1 is call clobbered.
- */
-#define EXPORT_FUNC(f, a, x, ...)                                      \
-       asm volatile(                                   \
-"      .globl\t" #x "\n"                               \
-#x ":\n"                                               \
-"      set %0, %%g1\n"                                 \
-"      or %%g1, %%g7, %%g1\n"                          \
-"      ld [%%g1], %%g1\n"                              \
-"      ld [%%g1 + %1], %%g1\n"                         \
-"      jmp %%g1\n"                                     \
-"      nop\n"                                          \
-       : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "g1");
 #elif defined(CONFIG_NDS32)
 /*
  * r16 holds the pointer to the global_data. gp is call clobbered.
@@ -195,20 +172,29 @@ gd_t *global_data;
 "      lwi     $r16, [$r16 + (%1)]\n"  \
 "      jr      $r16\n"                 \
        : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "$r16");
-#elif defined(CONFIG_OPENRISC)
+#elif defined(CONFIG_RISCV)
 /*
- * r10 holds the pointer to the global_data, r13 is a call-clobbered
- * register
+ * gp holds the pointer to the global_data. t0 is call clobbered.
  */
-#define EXPORT_FUNC(f, a, x, ...) \
+#ifdef CONFIG_ARCH_RV64I
+#define EXPORT_FUNC(f, a, x, ...)      \
+       asm volatile (                  \
+"      .globl " #x "\n"                \
+#x ":\n"                               \
+"      ld      t0, %0(gp)\n"           \
+"      ld      t0, %1(t0)\n"           \
+"      jr      t0\n"                   \
+       : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t0");
+#else
+#define EXPORT_FUNC(f, a, x, ...)      \
        asm volatile (                  \
 "      .globl " #x "\n"                \
 #x ":\n"                               \
-"      l.lwz   r13, %0(r10)\n" \
-"      l.lwz   r13, %1(r13)\n" \
-"      l.jr    r13\n"          \
-"      l.nop\n"                                \
-       : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r13");
+"      lw      t0, %0(gp)\n"           \
+"      lw      t0, %1(t0)\n"           \
+"      jr      t0\n"                   \
+       : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t0");
+#endif
 #elif defined(CONFIG_ARC)
 /*
  * r25 holds the pointer to the global_data. r10 is call clobbered.
@@ -222,6 +208,53 @@ gd_t *global_data;
 "      ld      r10, [r10, %1]\n" \
 "      j       [r10]\n" \
        : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r10");
+#elif defined(CONFIG_XTENSA)
+/*
+ * Global data ptr is in global_data, jump table ptr is in jt.
+ * Windowed ABI: Jump just past 'entry' in target and adjust stack frame
+ * (extract stack frame size from target 'entry' instruction).
+ */
+
+static void **jt;
+
+#if defined(__XTENSA_CALL0_ABI__)
+#define EXPORT_FUNC(f, a, x, ...)      \
+       asm volatile (                  \
+"      .extern jt\n"                   \
+"      .globl " #x "\n"                \
+"      .align 4\n"                     \
+#x ":\n"                               \
+"      l32i    a8, %0, 0\n"            \
+"      l32i    a8, a8, %1\n"           \
+"      jx      a8\n"                   \
+       : : "r"(jt), "i" (FO(x)) : "a8");
+#elif defined(__XTENSA_WINDOWED_ABI__)
+#if XCHAL_HAVE_BE
+# define SFT "8"
+#else
+# define SFT "12"
+#endif
+#define EXPORT_FUNC(f, a, x, ...)      \
+       asm volatile (                  \
+"      .extern jt\n"                   \
+"      .globl " #x "\n"                \
+"      .align 4\n"                     \
+#x ":\n"                               \
+"      entry   sp, 16\n"               \
+"      l32i    a8, %0, 0\n"            \
+"      l32i    a8, a8, %1\n"           \
+"      l32i    a9, a8, 0\n"            \
+"      extui   a9, a9, " SFT ", 12\n"  \
+"      subx8   a9, a9, sp\n"           \
+"      movi    a10, 16\n"              \
+"      sub     a9, a10, a9\n"          \
+"      movsp   sp, a9\n"               \
+"      addi    a8, a8, 3\n"            \
+"      jx      a8\n"                   \
+       : : "r"(jt), "i" (FO(x)) : "a8", "a9", "a10");
+#else
+#error Unsupported Xtensa ABI
+#endif
 #else
 /*"    addi    $sp, $sp, -24\n"        \
 "      br      $r16\n"                 \*/
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