PowerPC: Add support for -msingle-pic-base

-msingle-pic-base is a new gcc option for ppc and
it reduces the size of my u-boot with 6-8 KB.
While at it, add -fno-jump-tables too to save a
few more bytes.

-msingle-pic-base will be in gcc 4.6, however
backported patches are available at
http://bugs.gentoo.org/show_bug.cgi?id=347281

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>

13 files changed, 127 insertions, 12 deletions

diff --git a/arch/powerpc/config.mk b/arch/powerpc/config.mk
index 255f3d7af3c..8d72fbd7ecd 100644
--- a/arch/powerpc/config.mk
+++ b/arch/powerpc/config.mk
@@ -26,6 +26,8 @@ CROSS_COMPILE ?= ppc_8xx-
 STANDALONE_LOAD_ADDR = 0x40000
 LDFLAGS_FINAL += --gc-sections
 PLATFORM_RELFLAGS += -fpic -mrelocatable -ffunction-sections -fdata-sections
+PLATFORM_RELFLAGS += $(call cc-option,-msingle-pic-base,)
+PLATFORM_RELFLAGS += $(call cc-option,-fno-jump-tables,)
 PLATFORM_CPPFLAGS += -DCONFIG_PPC -D__powerpc__
 PLATFORM_LDFLAGS  += -n
 
diff --git a/arch/powerpc/cpu/74xx_7xx/start.S b/arch/powerpc/cpu/74xx_7xx/start.S
index f6011fcaa8c..ab9412ad9e2 100644
--- a/arch/powerpc/cpu/74xx_7xx/start.S
+++ b/arch/powerpc/cpu/74xx_7xx/start.S
@@ -274,7 +274,11 @@ in_flash:
 	stwu	r0, -4(r1)	/* stack backtraces terminate cleanly	*/
 
 	GET_GOT			/* initialize GOT access	*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* run low-level CPU init code     (from Flash)	*/
 	bl	cpu_init_f
 	sync
@@ -588,6 +592,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of Destination Address	*/
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address	*/
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h		/* Source      Address	*/
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc512x/start.S b/arch/powerpc/cpu/mpc512x/start.S
index 9c2e4885ded..632f9674c8e 100644
--- a/arch/powerpc/cpu/mpc512x/start.S
+++ b/arch/powerpc/cpu/mpc512x/start.S
@@ -255,7 +255,11 @@ in_flash:
 	/*------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access	*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	lis	r3, CONFIG_SYS_IMMR@h
 	/* run low-level CPU init code (in Flash) */
@@ -486,6 +490,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of Destination Address */
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address */
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h		/* Source      Address */
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc5xx/start.S b/arch/powerpc/cpu/mpc5xx/start.S
index cc11c8fc528..4fb2047da47 100644
--- a/arch/powerpc/cpu/mpc5xx/start.S
+++ b/arch/powerpc/cpu/mpc5xx/start.S
@@ -174,7 +174,11 @@ in_flash:
 	/*----------------------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access			*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	bl	cpu_init_f	/* run low-level CPU init code     (from Flash)	*/
 
@@ -363,6 +367,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of monitor destination Address in SRAM */
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address	*/
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h		/* Source      Address	*/
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc5xxx/start.S b/arch/powerpc/cpu/mpc5xxx/start.S
index 192aa506a88..0a0536119a6 100644
--- a/arch/powerpc/cpu/mpc5xxx/start.S
+++ b/arch/powerpc/cpu/mpc5xxx/start.S
@@ -160,7 +160,11 @@ lowboot_reentry:
 	/*--------------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access		*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	bl	cpu_init_f	/* run low-level CPU init code (in Flash)*/
 
@@ -549,6 +553,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of Destination Address	*/
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address	*/
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h		/* Source      Address	*/
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc8220/start.S b/arch/powerpc/cpu/mpc8220/start.S
index 300b35c0c4f..1df87a6afd4 100644
--- a/arch/powerpc/cpu/mpc8220/start.S
+++ b/arch/powerpc/cpu/mpc8220/start.S
@@ -129,7 +129,11 @@ _start:
 	/*--------------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access		*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	bl	cpu_init_f	/* run low-level CPU init code (in Flash)*/
 
@@ -522,6 +526,11 @@ relocate_code:
 	mr	r10, r5	    /* Save copy of Destination Address */
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5	    /* Destination Address		*/
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h	/* Source Address	*/
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc824x/start.S b/arch/powerpc/cpu/mpc824x/start.S
index fc4e922d633..cc988759e0a 100644
--- a/arch/powerpc/cpu/mpc824x/start.S
+++ b/arch/powerpc/cpu/mpc824x/start.S
@@ -183,7 +183,11 @@ in_flash:
 	/*----------------------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access			*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	bl	cpu_init_f	/* run low-level CPU init code     (from Flash)	*/
 
@@ -452,6 +456,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of Destination Address	*/
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address	*/
 #ifdef CONFIG_SYS_RAMBOOT
 	lis	r4, CONFIG_SYS_SDRAM_BASE@h		/* Source      Address	*/
diff --git a/arch/powerpc/cpu/mpc8260/start.S b/arch/powerpc/cpu/mpc8260/start.S
index 702546eec5c..23151cdadf7 100644
--- a/arch/powerpc/cpu/mpc8260/start.S
+++ b/arch/powerpc/cpu/mpc8260/start.S
@@ -236,7 +236,11 @@ in_flash:
 	/*--------------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access		*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	bl	cpu_init_f	/* run low-level CPU init code (in Flash)*/
 
diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S
index 7e60315c3f4..a9acb83f0b1 100644
--- a/arch/powerpc/cpu/mpc83xx/start.S
+++ b/arch/powerpc/cpu/mpc83xx/start.S
@@ -285,7 +285,11 @@ in_flash:
 	/*------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access	*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	lis	r3, CONFIG_SYS_IMMR@h
 	/* run low-level CPU init code (in Flash)*/
@@ -822,6 +826,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of Destination Address */
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address */
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h		/* Source      Address */
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S
index 57774933a3d..36233578f73 100644
--- a/arch/powerpc/cpu/mpc85xx/start.S
+++ b/arch/powerpc/cpu/mpc85xx/start.S
@@ -421,6 +421,11 @@ _start_cont:
 	stw	r0,+12(r1)		/* Save return addr (underflow vect) */
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	bl	cpu_init_early_f
 
 	/* switch back to AS = 0 */
@@ -921,6 +926,11 @@ relocate_code:
 	mr	r10,r5		/* Save copy of Destination Address	*/
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,r5				/* Destination Address	*/
 	lis	r4,CONFIG_SYS_MONITOR_BASE@h		/* Source      Address	*/
 	ori	r4,r4,CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc86xx/start.S b/arch/powerpc/cpu/mpc86xx/start.S
index 3e3c21eefd2..2ec7fd46b00 100644
--- a/arch/powerpc/cpu/mpc86xx/start.S
+++ b/arch/powerpc/cpu/mpc86xx/start.S
@@ -255,7 +255,11 @@ addr_trans_enabled:
 	stwu	r0, -4(r1)	/* stack backtraces terminate cleanly	*/
 
 	GET_GOT			/* initialize GOT access	*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* run low-level CPU init code	   (from Flash) */
 	bl	cpu_init_f
 	sync
@@ -620,6 +624,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of Destination Address	*/
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address	*/
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h		/* Source      Address	*/
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/mpc8xx/start.S b/arch/powerpc/cpu/mpc8xx/start.S
index fe3daa2b9f7..f8256bff995 100644
--- a/arch/powerpc/cpu/mpc8xx/start.S
+++ b/arch/powerpc/cpu/mpc8xx/start.S
@@ -188,7 +188,11 @@ in_flash:
 	/*----------------------------------------------------------------------*/
 
 	GET_GOT			/* initialize GOT access			*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	/* r3: IMMR */
 	bl	cpu_init_f	/* run low-level CPU init code     (from Flash)	*/
 
@@ -473,6 +477,11 @@ relocate_code:
 	mr	r10, r5		/* Save copy of Destination Address	*/
 
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	mr	r3,  r5				/* Destination Address	*/
 	lis	r4, CONFIG_SYS_MONITOR_BASE@h		/* Source      Address	*/
 	ori	r4, r4, CONFIG_SYS_MONITOR_BASE@l
diff --git a/arch/powerpc/cpu/ppc4xx/start.S b/arch/powerpc/cpu/ppc4xx/start.S
index b43e22c8f04..aa03d9a770c 100644
--- a/arch/powerpc/cpu/ppc4xx/start.S
+++ b/arch/powerpc/cpu/ppc4xx/start.S
@@ -262,6 +262,11 @@
 	bl	reconfig_tlb0
 #endif
 	GET_GOT
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	bl	cpu_init_f	/* run low-level CPU init code	   (from Flash) */
 	bl	board_init_f
 	/* NOTREACHED - board_init_f() does not return */
@@ -799,7 +804,11 @@ _start:
 	ori	r0,r0, RESET_VECTOR@l
 	stwu	r1,-8(r1)		/* Save back chain and move SP */
 	stw	r0,+12(r1)		/* Save return addr (underflow vect) */
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 #ifdef CONFIG_NAND_SPL
 	bl	nand_boot_common	/* will not return */
 #else
@@ -914,7 +923,11 @@ _start:
 	stwu	r0, -4(r1)		/* stack backtraces terminate cleanly	*/
 
 	GET_GOT			/* initialize GOT access			*/
-
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 	bl	board_init_f	/* run first part of init code (from Flash)	*/
 	/* NOTREACHED - board_init_f() does not return */
 
@@ -1179,6 +1192,11 @@ _start:
 	stw	r0, +12(r1)		/* Save return addr (underflow vect) */
 #endif /* CONFIG_SYS_INIT_DCACHE_CS */
 
+#if defined(__pic__) && __pic__ == 1
+	/* Needed for upcoming -msingle-pic-base */
+	bl	_GLOBAL_OFFSET_TABLE_@local-4
+	mflr	r30
+#endif
 #ifdef CONFIG_NAND_SPL
 	bl	nand_boot_common	/* will not return */
 #else