upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
178 lines
4.6 KiB
178 lines
4.6 KiB
#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)
|
|
/*
|
|
* r29 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(%%r29)\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, r0, 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");
|
|
#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 long * cp = &__bss_start;
|
|
|
|
/* Zero out BSS */
|
|
while (cp < &_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
|
|
|