[people/ms/u-boot.git] / examples / standalone / stubs.c

#include <common.h>
#include <exports.h>

#ifndef GCC_VERSION
#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
#endif /* GCC_VERSION */

#if defined(CONFIG_X86)
/*
 * 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_NIOS2)
/*
 * gp 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, gp\n"		\
"	ldw	r8, 0(r8)\n"		\
"	ldw	r8, %1(r8)\n"		\
"	jmp	r8\n"			\
	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "gp");
#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)
/*
 * P3 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 = [P3 + %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"				\
"	jmp %%g1\n"					\
"	nop\n"						\
	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "g1" );
#elif defined(CONFIG_NDS32)
/*
 * r16 holds the pointer to the global_data. gp is call clobbered.
 * not support reduced register (16 GPR).
 */
#define EXPORT_FUNC(x) \
	asm volatile (			\
"	.globl " #x "\n"		\
#x ":\n"				\
"	lwi	$r16, [$gp + (%0)]\n"	\
"	lwi	$r16, [$r16 + (%1)]\n"	\
"	jr	$r16\n"			\
	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "$r16");
#elif defined(CONFIG_OPENRISC)
/*
 * r10 holds the pointer to the global_data, r13 is a call-clobbered
 * register
 */
#define EXPORT_FUNC(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"(XF_ ## x * sizeof(void *)) : "r13");
#else
/*"	addi	$sp, $sp, -24\n"	\
"	br	$r16\n"			\*/

#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>
}

#include <asm/sections.h>

void app_startup(char * const *argv)
{
	char *cp = __bss_start;

	/* Zero out BSS */
	while (cp < _end)
		*cp++ = 0;

#if defined(CONFIG_X86)
	/* 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
Commit	Line	Data
0910d0bc	1	#include <common.h>
27b207fd WD	2	#include <exports.h>
27b207fd WD	3
93f6a677 WD	4	#ifndef GCC_VERSION
	5	#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
	6	#endif /* GCC_VERSION */
	7
fea25720	8	#if defined(CONFIG_X86)
27b207fd WD	9	/*
	10	* x86 does not have a dedicated register to store the pointer to
	11	* the global_data. Thus the jump table address is stored in a
	12	* global variable, but such approach does not allow for execution
	13	* from flash memory. The global_data address is passed as argv[-1]
	14	* to the application program.
	15	*/
	16	static void **jt;
77846748	17	gd_t *global_data;
27b207fd WD	18
	19	#define EXPORT_FUNC(x) \
	20	asm volatile ( \
	21	" .globl " #x "\n" \
	22	#x ":\n" \
	23	" movl %0, %%eax\n" \
	24	" movl jt, %%ecx\n" \
	25	" jmp *(%%ecx, %%eax)\n" \
	26	: : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
	27	#elif defined(CONFIG_PPC)
	28	/*
e7670f6c	29	* r2 holds the pointer to the global_data, r11 is a call-clobbered
27b207fd WD	30	* register
	31	*/
	32	#define EXPORT_FUNC(x) \
	33	asm volatile ( \
	34	" .globl " #x "\n" \
	35	#x ":\n" \
e7670f6c	36	" lwz %%r11, %0(%%r2)\n" \
27b207fd WD	37	" lwz %%r11, %1(%%r11)\n" \
	38	" mtctr %%r11\n" \
	39	" bctr\n" \
	40	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r11");
	41	#elif defined(CONFIG_ARM)
	42	/*
	43	* r8 holds the pointer to the global_data, ip is a call-clobbered
	44	* register
	45	*/
	46	#define EXPORT_FUNC(x) \
	47	asm volatile ( \
	48	" .globl " #x "\n" \
	49	#x ":\n" \
	50	" ldr ip, [r8, %0]\n" \
	51	" ldr pc, [ip, %1]\n" \
	52	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip");
	53	#elif defined(CONFIG_MIPS)
	54	/*
	55	* k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
	56	* clobbered register that is also used to set gp ($26). Note that the
	57	* jr instruction also executes the instruction immediately following
	58	* it; however, GCC/mips generates an additional `nop' after each asm
	59	* statement
	60	*/
	61	#define EXPORT_FUNC(x) \
	62	asm volatile ( \
	63	" .globl " #x "\n" \
	64	#x ":\n" \
	65	" lw $25, %0($26)\n" \
	66	" lw $25, %1($25)\n" \
	67	" jr $25\n" \
	68	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9");
5c952cf0 WD	69	#elif defined(CONFIG_NIOS2)
5c952cf0 WD	70	/*
0df01fd3	71	* gp holds the pointer to the global_data, r8 is call-clobbered
5c952cf0 WD	72	*/
	73	#define EXPORT_FUNC(x) \
	74	asm volatile ( \
	75	" .globl " #x "\n" \
	76	#x ":\n" \
	77	" movhi r8, %%hi(%0)\n" \
	78	" ori r8, r0, %%lo(%0)\n" \
0df01fd3	79	" add r8, r8, gp\n" \
5c952cf0 WD	80	" ldw r8, 0(r8)\n" \
	81	" ldw r8, %1(r8)\n" \
	82	" jmp r8\n" \
0df01fd3	83	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "gp");
bf9e3b38 WD	84	#elif defined(CONFIG_M68K)
	85	/*
	86	* d7 holds the pointer to the global_data, a0 is a call-clobbered
	87	* register
	88	*/
	89	#define EXPORT_FUNC(x) \
	90	asm volatile ( \
	91	" .globl " #x "\n" \
	92	#x ":\n" \
	93	" move.l %%d7, %%a0\n" \
	94	" adda.l %0, %%a0\n" \
	95	" move.l (%%a0), %%a0\n" \
	96	" adda.l %1, %%a0\n" \
	97	" move.l (%%a0), %%a0\n" \
	98	" jmp (%%a0)\n" \
	99	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "a0");
857cad37	100	#elif defined(CONFIG_MICROBLAZE)
507bbe3e WD	101	/*
	102	* r31 holds the pointer to the global_data. r5 is a call-clobbered.
	103	*/
	104	#define EXPORT_FUNC(x) \
	105	asm volatile ( \
	106	" .globl " #x "\n" \
	107	#x ":\n" \
	108	" lwi r5, r31, %0\n" \
	109	" lwi r5, r5, %1\n" \
	110	" bra r5\n" \
	111	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r5");
0afe519a WD	112	#elif defined(CONFIG_BLACKFIN)
0afe519a WD	113	/*
c4db335c	114	* P3 holds the pointer to the global_data, P0 is a call-clobbered
0afe519a WD	115	* register
	116	*/
	117	#define EXPORT_FUNC(x) \
8e7b703a	118	asm volatile ( \
61fb15c5	119	" .globl _" #x "\n_" \
0afe519a	120	#x ":\n" \
c4db335c	121	" P0 = [P3 + %0]\n" \
0afe519a WD	122	" P0 = [P0 + %1]\n" \
	123	" JUMP (P0)\n" \
	124	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "P0");
7b64fef3 WD	125	#elif defined(CONFIG_AVR32)
	126	/*
	127	* r6 holds the pointer to the global_data. r8 is call clobbered.
	128	*/
	129	#define EXPORT_FUNC(x) \
	130	asm volatile( \
	131	" .globl\t" #x "\n" \
	132	#x ":\n" \
	133	" ld.w r8, r6[%0]\n" \
	134	" ld.w pc, r8[%1]\n" \
	135	: \
	136	: "i"(offsetof(gd_t, jt)), "i"(XF_ ##x) \
	137	: "r8");
0b135cfc NI	138	#elif defined(CONFIG_SH)
	139	/*
	140	* r13 holds the pointer to the global_data. r1 is a call clobbered.
	141	*/
61fb15c5 WD	142	#define EXPORT_FUNC(x) \
	143	asm volatile ( \
	144	" .align 2\n" \
	145	" .globl " #x "\n" \
	146	#x ":\n" \
	147	" mov r13, r1\n" \
	148	" add %0, r1\n" \
cae6f909 NI	149	" mov.l @r1, r2\n" \
	150	" add %1, r2\n" \
	151	" mov.l @r2, r1\n" \
61fb15c5 WD	152	" jmp @r1\n" \
	153	" nop\n" \
	154	" nop\n" \
cae6f909	155	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r1", "r2");
c2f02da2 DH	156	#elif defined(CONFIG_SPARC)
	157	/*
	158	* g7 holds the pointer to the global_data. g1 is call clobbered.
	159	*/
	160	#define EXPORT_FUNC(x) \
	161	asm volatile( \
	162	" .globl\t" #x "\n" \
	163	#x ":\n" \
	164	" set %0, %%g1\n" \
	165	" or %%g1, %%g7, %%g1\n" \
	166	" ld [%%g1], %%g1\n" \
	167	" ld [%%g1 + %1], %%g1\n" \
2c0c58b9	168	" jmp %%g1\n" \
c2f02da2	169	" nop\n" \
2c0c58b9	170	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "g1" );
72c73dde ML	171	#elif defined(CONFIG_NDS32)
	172	/*
	173	* r16 holds the pointer to the global_data. gp is call clobbered.
	174	* not support reduced register (16 GPR).
	175	*/
	176	#define EXPORT_FUNC(x) \
	177	asm volatile ( \
	178	" .globl " #x "\n" \
	179	#x ":\n" \
	180	" lwi $r16, [$gp + (%0)]\n" \
	181	" lwi $r16, [$r16 + (%1)]\n" \
	182	" jr $r16\n" \
	183	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "$r16");
3553493d SK	184	#elif defined(CONFIG_OPENRISC)
	185	/*
	186	* r10 holds the pointer to the global_data, r13 is a call-clobbered
	187	* register
	188	*/
	189	#define EXPORT_FUNC(x) \
	190	asm volatile ( \
	191	" .globl " #x "\n" \
	192	#x ":\n" \
	193	" l.lwz r13, %0(r10)\n" \
	194	" l.lwz r13, %1(r13)\n" \
	195	" l.jr r13\n" \
	196	" l.nop\n" \
	197	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r13");
27b207fd	198	#else
72c73dde ML	199	/*" addi $sp, $sp, -24\n" \
	200	" br $r16\n" \*/
	201
27b207fd WD	202	#error stubs definition missing for this architecture
	203	#endif
	204
	205	/* This function is necessary to prevent the compiler from
	206	* generating prologue/epilogue, preparing stack frame etc.
	207	* The stub functions are special, they do not use the stack
	208	* frame passed to them, but pass it intact to the actual
	209	* implementation. On the other hand, asm() statements with
	210	* arguments can be used only inside the functions (gcc limitation)
	211	*/
93f6a677 WD	212	#if GCC_VERSION < 3004
	213	static
	214	#endif /* GCC_VERSION */
	215	void __attribute__((unused)) dummy(void)
27b207fd WD	216	{
	217	#include <_exports.h>
	218	}
	219
716cc8cc	220	#include <asm/sections.h>
d716b126	221
54841ab5	222	void app_startup(char * const *argv)
27b207fd	223	{
716cc8cc	224	char *cp = __bss_start;
d716b126 WD	225
d716b126 WD	226	/* Zero out BSS */
716cc8cc	227	while (cp < _end)
d716b126	228	*cp++ = 0;
d716b126	229
fea25720	230	#if defined(CONFIG_X86)
27b207fd	231	/* x86 does not have a dedicated register for passing global_data */
77846748 WD	232	global_data = (gd_t *)argv[-1];
77846748 WD	233	jt = global_data->jt;
27b207fd WD	234	#endif
	235	}
	236
	237	#undef EXPORT_FUNC