4 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
5 #endif /* GCC_VERSION */
7 #if defined(CONFIG_I386)
9 * x86 does not have a dedicated register to store the pointer to
10 * the global_data. Thus the jump table address is stored in a
11 * global variable, but such approach does not allow for execution
12 * from flash memory. The global_data address is passed as argv[-1]
13 * to the application program.
18 #define EXPORT_FUNC(x) \
24 " jmp *(%%ecx, %%eax)\n" \
25 : : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
26 #elif defined(CONFIG_PPC)
28 * r29 holds the pointer to the global_data, r11 is a call-clobbered
31 #define EXPORT_FUNC(x) \
35 " lwz %%r11, %0(%%r29)\n" \
36 " lwz %%r11, %1(%%r11)\n" \
39 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r11");
40 #elif defined(CONFIG_ARM)
42 * r8 holds the pointer to the global_data, ip is a call-clobbered
45 #define EXPORT_FUNC(x) \
49 " ldr ip, [r8, %0]\n" \
50 " ldr pc, [ip, %1]\n" \
51 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip");
52 #elif defined(CONFIG_MIPS)
54 * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
55 * clobbered register that is also used to set gp ($26). Note that the
56 * jr instruction also executes the instruction immediately following
57 * it; however, GCC/mips generates an additional `nop' after each asm
60 #define EXPORT_FUNC(x) \
64 " lw $25, %0($26)\n" \
65 " lw $25, %1($25)\n" \
67 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9");
68 #elif defined(CONFIG_NIOS)
70 * %g7 holds the pointer to the global_data. %g0 is call clobbered.
72 #define EXPORT_FUNC(x) \
77 " movi %%g0, %%lo(%0)\n" \
79 " ld %%g0, [%%g0]\n" \
81 " ld %%g0, [%%g0]\n" \
84 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x) : "r0");
85 #elif defined(CONFIG_M68K)
87 * d7 holds the pointer to the global_data, a0 is a call-clobbered
90 #define EXPORT_FUNC(x) \
94 " move.l %%d7, %%a0\n" \
95 " adda.l %0, %%a0\n" \
96 " move.l (%%a0), %%a0\n" \
97 " adda.l %1, %%a0\n" \
98 " move.l (%%a0), %%a0\n" \
100 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "a0");
101 #elif defined(CONFIG_MICROBLZE)
103 * r31 holds the pointer to the global_data. r5 is a call-clobbered.
105 #define EXPORT_FUNC(x) \
109 " lwi r5, r31, %0\n" \
110 " lwi r5, r5, %1\n" \
112 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r5");
114 #error stubs definition missing for this architecture
117 /* This function is necessary to prevent the compiler from
118 * generating prologue/epilogue, preparing stack frame etc.
119 * The stub functions are special, they do not use the stack
120 * frame passed to them, but pass it intact to the actual
121 * implementation. On the other hand, asm() statements with
122 * arguments can be used only inside the functions (gcc limitation)
124 #if GCC_VERSION < 3004
126 #endif /* GCC_VERSION */
127 void __attribute__((unused)) dummy(void)
129 #include <_exports.h>
132 extern unsigned long __bss_start, _end;
134 void app_startup(char **argv)
136 unsigned long * cp = &__bss_start;
143 #if defined(CONFIG_I386)
144 /* x86 does not have a dedicated register for passing global_data */
145 global_data = (gd_t *)argv[-1];
146 jt = global_data->jt;