| 1 | #include <exports.h> |
| 2 | |
| 3 | #ifndef GCC_VERSION |
| 4 | #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__) |
| 5 | #endif /* GCC_VERSION */ |
| 6 | |
| 7 | /* |
| 8 | * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call- |
| 9 | * clobbered register that is also used to set gp ($26). Note that the |
| 10 | * jr instruction also executes the instruction immediately following |
| 11 | * it; however, GCC/mips generates an additional `nop' after each asm |
| 12 | * statement |
| 13 | */ |
| 14 | #define EXPORT_FUNC(x) \ |
| 15 | asm volatile ( \ |
| 16 | " .globl " #x "\n" \ |
| 17 | #x ":\n" \ |
| 18 | " lw $25, %0($26)\n" \ |
| 19 | " lw $25, %1($25)\n" \ |
| 20 | " jr $25\n" \ |
| 21 | : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9"); |
| 22 | |
| 23 | /* This function is necessary to prevent the compiler from |
| 24 | * generating prologue/epilogue, preparing stack frame etc. |
| 25 | * The stub functions are special, they do not use the stack |
| 26 | * frame passed to them, but pass it intact to the actual |
| 27 | * implementation. On the other hand, asm() statements with |
| 28 | * arguments can be used only inside the functions (gcc limitation) |
| 29 | */ |
| 30 | #if GCC_VERSION < 3004 |
| 31 | static |
| 32 | #endif /* GCC_VERSION */ |
| 33 | void __attribute__((unused)) dummy(void) |
| 34 | { |
| 35 | #include <_exports.h> |
| 36 | } |
| 37 | |
| 38 | #if 0 |
| 39 | extern unsigned long __bss_start, _end; |
| 40 | |
| 41 | void app_startup(char **argv) |
| 42 | { |
| 43 | unsigned long * cp = &__bss_start; |
| 44 | |
| 45 | /* Zero out BSS */ |
| 46 | while (cp < &_end) { |
| 47 | *cp++ = 0; |
| 48 | } |
| 49 | } |
| 50 | #endif |
| 51 | |
| 52 | #undef EXPORT_FUNC |
| 53 | |
