Export redesign

this is an atempt to make the export of functions typesafe.
I replaced the jumptable void ** by a struct (jt_funcs) with function pointers.
The EXPORT_FUNC macro now has 3 fixed parameters and one
variadic parameter
The first is the name of the exported function,
the rest of the parameters are used to format a functionpointer
in the jumptable,

the EXPORT_FUNC macros are expanded three times,
1. to declare the members of the struct
2. to initialize the structmember pointers
3. to call the functions in stubs.c

Signed-off-by: Martin Dorwig <dorwig@tetronik.com>
Acked-by: Simon Glass <sjg@chromium.org>

Signed-off-by: Simon Glass <sjg@chromium.org>
(resending to the list since my tweaks are not quite trivial)

1 files changed, 33 insertions, 31 deletions

diff --git a/examples/standalone/stubs.c b/examples/standalone/stubs.c
index 0bf690e..920a0a9 100644
--- a/examples/standalone/stubs.c
+++ b/examples/standalone/stubs.c
@@ -2,6 +2,8 @@
 #include <exports.h>
 #include <linux/compiler.h>
 
+#define FO(x) offsetof(struct jt_funcs, x)
+
 #if defined(CONFIG_X86)
 /*
  * x86 does not have a dedicated register to store the pointer to
@@ -10,23 +12,23 @@
  * from flash memory. The global_data address is passed as argv[-1]
  * to the application program.
  */
-static void **jt;
+static struct jt_funcs *jt;
 gd_t *global_data;
 
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, 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");
+	: : "i"(FO(x)) : "eax", "ecx");
 #elif defined(CONFIG_PPC)
 /*
  * r2 holds the pointer to the global_data, r11 is a call-clobbered
  * register
  */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, x, ...) \
 	asm volatile (			\
 "	.globl " #x "\n"		\
 #x ":\n"				\
@@ -34,33 +36,33 @@ gd_t *global_data;
 "	lwz	%%r11, %1(%%r11)\n"	\
 "	mtctr	%%r11\n"		\
 "	bctr\n"				\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r11");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r11");
 #elif defined(CONFIG_ARM)
 #ifdef CONFIG_ARM64
 /*
  * x18 holds the pointer to the global_data, x9 is a call-clobbered
  * register
  */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, x, ...) \
 	asm volatile (			\
 "	.globl " #x "\n"		\
 #x ":\n"				\
 "	ldr	x9, [x18, %0]\n"		\
 "	ldr	x9, [x9, %1]\n"		\
 "	br	x9\n"		\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "x9");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "x9");
 #else
 /*
  * r9 holds the pointer to the global_data, ip is a call-clobbered
  * register
  */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, x, ...) \
 	asm volatile (			\
 "	.globl " #x "\n"		\
 #x ":\n"				\
 "	ldr	ip, [r9, %0]\n"		\
 "	ldr	pc, [ip, %1]\n"		\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "ip");
 #endif
 #elif defined(CONFIG_MIPS)
 /*
@@ -70,19 +72,19 @@ gd_t *global_data;
  * it; however, GCC/mips generates an additional `nop' after each asm
  * statement
  */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, 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");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9");
 #elif defined(CONFIG_NIOS2)
 /*
  * gp holds the pointer to the global_data, r8 is call-clobbered
  */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, x, ...) \
 	asm volatile (			\
 "	.globl " #x "\n"		\
 #x ":\n"				\
@@ -92,13 +94,13 @@ gd_t *global_data;
 "	ldw	r8, 0(r8)\n"		\
 "	ldw	r8, %1(r8)\n"		\
 "	jmp	r8\n"			\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "gp");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "gp");
 #elif defined(CONFIG_M68K)
 /*
  * d7 holds the pointer to the global_data, a0 is a call-clobbered
  * register
  */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, x, ...) \
 	asm volatile (			\
 "	.globl " #x "\n"		\
 #x ":\n"				\
@@ -108,50 +110,50 @@ gd_t *global_data;
 "	adda.l	%1, %%a0\n"		\
 "	move.l	(%%a0), %%a0\n"		\
 "	jmp	(%%a0)\n"			\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "a0");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "a0");
 #elif defined(CONFIG_MICROBLAZE)
 /*
  * r31 holds the pointer to the global_data. r5 is a call-clobbered.
  */
-#define EXPORT_FUNC(x)				\
+#define EXPORT_FUNC(f, a, 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");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r5");
 #elif defined(CONFIG_BLACKFIN)
 /*
  * P3 holds the pointer to the global_data, P0 is a call-clobbered
  * register
  */
-#define EXPORT_FUNC(x)			\
+#define EXPORT_FUNC(f, a, 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");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "P0");
 #elif defined(CONFIG_AVR32)
 /*
  * r6 holds the pointer to the global_data. r8 is call clobbered.
  */
-#define EXPORT_FUNC(x)					\
+#define EXPORT_FUNC(f, a, 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)	\
+		: "i"(offsetof(gd_t, jt)), "i"(FO(x))	\
 		: "r8");
 #elif defined(CONFIG_SH)
 /*
  * r13 holds the pointer to the global_data. r1 is a call clobbered.
  */
-#define EXPORT_FUNC(x)					\
+#define EXPORT_FUNC(f, a, x, ...)					\
 	asm volatile (					\
 		"	.align	2\n"			\
 		"	.globl " #x "\n"		\
@@ -164,12 +166,12 @@ gd_t *global_data;
 		"	jmp	@r1\n"			\
 		"	nop\n"				\
 		"	nop\n"				\
-		: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r1", "r2");
+		: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r1", "r2");
 #elif defined(CONFIG_SPARC)
 /*
  * g7 holds the pointer to the global_data. g1 is call clobbered.
  */
-#define EXPORT_FUNC(x)					\
+#define EXPORT_FUNC(f, a, x, ...)					\
 	asm volatile(					\
 "	.globl\t" #x "\n"				\
 #x ":\n"						\
@@ -179,26 +181,26 @@ gd_t *global_data;
 "	ld [%%g1 + %1], %%g1\n"				\
 "	jmp %%g1\n"					\
 "	nop\n"						\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "g1" );
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "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) \
+#define EXPORT_FUNC(f, a, 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");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "$r16");
 #elif defined(CONFIG_OPENRISC)
 /*
  * r10 holds the pointer to the global_data, r13 is a call-clobbered
  * register
  */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, x, ...) \
 	asm volatile (			\
 "	.globl " #x "\n"		\
 #x ":\n"				\
@@ -206,12 +208,12 @@ gd_t *global_data;
 "	l.lwz	r13, %1(r13)\n"	\
 "	l.jr	r13\n"		\
 "	l.nop\n"				\
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r13");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r13");
 #elif defined(CONFIG_ARC)
 /*
  * r25 holds the pointer to the global_data. r10 is call clobbered.
   */
-#define EXPORT_FUNC(x) \
+#define EXPORT_FUNC(f, a, x, ...) \
 	asm volatile( \
 "	.align 4\n" \
 "	.globl " #x "\n" \
@@ -219,7 +221,7 @@ gd_t *global_data;
 "	ld	r10, [r25, %0]\n" \
 "	ld	r10, [r10, %1]\n" \
 "	j	[r10]\n" \
-	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r10");
+	: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r10");
 #else
 /*"	addi	$sp, $sp, -24\n"	\
 "	br	$r16\n"			\*/