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Diffstat (limited to 'examples/stubs.c')
| -rw-r--r-- | examples/stubs.c | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/examples/stubs.c b/examples/stubs.c deleted file mode 100644 index a8cb954..0000000 --- a/examples/stubs.c +++ /dev/null @@ -1,225 +0,0 @@ -#include <exports.h> - -#ifndef GCC_VERSION -#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__) -#endif /* GCC_VERSION */ - -#if defined(CONFIG_I386) -/* - * x86 does not have a dedicated register to store the pointer to - * the global_data. Thus the jump table address is stored in a - * global variable, but such approach does not allow for execution - * from flash memory. The global_data address is passed as argv[-1] - * to the application program. - */ -static void **jt; -gd_t *global_data; - -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" movl %0, %%eax\n" \ -" movl jt, %%ecx\n" \ -" jmp *(%%ecx, %%eax)\n" \ - : : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx"); -#elif defined(CONFIG_PPC) -/* - * r2 holds the pointer to the global_data, r11 is a call-clobbered - * register - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" lwz %%r11, %0(%%r2)\n" \ -" lwz %%r11, %1(%%r11)\n" \ -" mtctr %%r11\n" \ -" bctr\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r11"); -#elif defined(CONFIG_ARM) -/* - * r8 holds the pointer to the global_data, ip is a call-clobbered - * register - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" ldr ip, [r8, %0]\n" \ -" ldr pc, [ip, %1]\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip"); -#elif defined(CONFIG_MIPS) -/* - * 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(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" lw $25, %0($26)\n" \ -" lw $25, %1($25)\n" \ -" jr $25\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9"); -#elif defined(CONFIG_NIOS) -/* - * %g7 holds the pointer to the global_data. %g0 is call clobbered. - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" pfx %%hi(%0)\n" \ -" movi %%g0, %%lo(%0)\n" \ -" add %%g0, %%g7\n" \ -" ld %%g0, [%%g0]\n" \ -" pfx %1\n" \ -" ld %%g0, [%%g0]\n" \ -" jmp %%g0\n" \ -" nop \n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x) : "r0"); -#elif defined(CONFIG_NIOS2) -/* - * r15 holds the pointer to the global_data, r8 is call-clobbered - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" movhi r8, %%hi(%0)\n" \ -" ori r8, r0, %%lo(%0)\n" \ -" add r8, r8, r15\n" \ -" ldw r8, 0(r8)\n" \ -" ldw r8, %1(r8)\n" \ -" jmp r8\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r15"); -#elif defined(CONFIG_M68K) -/* - * d7 holds the pointer to the global_data, a0 is a call-clobbered - * register - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" move.l %%d7, %%a0\n" \ -" adda.l %0, %%a0\n" \ -" move.l (%%a0), %%a0\n" \ -" adda.l %1, %%a0\n" \ -" move.l (%%a0), %%a0\n" \ -" jmp (%%a0)\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "a0"); -#elif defined(CONFIG_MICROBLAZE) -/* - * r31 holds the pointer to the global_data. r5 is a call-clobbered. - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl " #x "\n" \ -#x ":\n" \ -" lwi r5, r31, %0\n" \ -" lwi r5, r5, %1\n" \ -" bra r5\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r5"); -#elif defined(CONFIG_BLACKFIN) -/* - * P5 holds the pointer to the global_data, P0 is a call-clobbered - * register - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ -" .globl _" #x "\n_" \ -#x ":\n" \ -" P0 = [P5 + %0]\n" \ -" P0 = [P0 + %1]\n" \ -" JUMP (P0)\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "P0"); -#elif defined(CONFIG_AVR32) -/* - * r6 holds the pointer to the global_data. r8 is call clobbered. - */ -#define EXPORT_FUNC(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"(XF_ ##x) \ - : "r8"); -#elif defined(CONFIG_SH) -/* - * r13 holds the pointer to the global_data. r1 is a call clobbered. - */ -#define EXPORT_FUNC(x) \ - asm volatile ( \ - " .align 2\n" \ - " .globl " #x "\n" \ - #x ":\n" \ - " mov r13, r1\n" \ - " add %0, r1\n" \ - " mov.l @r1, r2\n" \ - " add %1, r2\n" \ - " mov.l @r2, r1\n" \ - " jmp @r1\n" \ - " nop\n" \ - " nop\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r1", "r2"); -#elif defined(CONFIG_SPARC) -/* - * g7 holds the pointer to the global_data. g1 is call clobbered. - */ -#define EXPORT_FUNC(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" \ -" call %%g1\n" \ -" nop\n" \ - : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x) : "g1" ); - -#else -#error stubs definition missing for this architecture -#endif - -/* This function is necessary to prevent the compiler from - * generating prologue/epilogue, preparing stack frame etc. - * The stub functions are special, they do not use the stack - * frame passed to them, but pass it intact to the actual - * implementation. On the other hand, asm() statements with - * arguments can be used only inside the functions (gcc limitation) - */ -#if GCC_VERSION < 3004 -static -#endif /* GCC_VERSION */ -void __attribute__((unused)) dummy(void) -{ -#include <_exports.h> -} - -extern unsigned long __bss_start, _end; - -void app_startup(char **argv) -{ - unsigned char * cp = (unsigned char *) &__bss_start; - - /* Zero out BSS */ - while (cp < (unsigned char *)&_end) { - *cp++ = 0; - } - -#if defined(CONFIG_I386) - /* x86 does not have a dedicated register for passing global_data */ - global_data = (gd_t *)argv[-1]; - jt = global_data->jt; -#endif -} - -#undef EXPORT_FUNC |