[U-Boot] [PATCH 06/32] Blackfin: move section length calculation to linker script

[Mike Frysinger]

The length of the sections is fixed at link time, so let the linker do the
calculation rather than doing it ourselves at runtime.

Signed-off-by: Mike Frysinger <vapier at gentoo.org>
---
 cpu/blackfin/cpu.c        |   11 +++++------
 cpu/blackfin/start.S      |   18 ++++++++----------
 lib_blackfin/u-boot.lds.S |   24 +++++++++++++++++-------
 3 files changed, 30 insertions(+), 23 deletions(-)

diff --git a/cpu/blackfin/cpu.c b/cpu/blackfin/cpu.c
index 9bb6407..2c8fd86 100644
--- a/cpu/blackfin/cpu.c
+++ b/cpu/blackfin/cpu.c
@@ -25,13 +25,12 @@ ulong bfin_poweron_retx;
 __attribute__ ((__noreturn__))
 void cpu_init_f(ulong bootflag, ulong loaded_from_ldr)
 {
-	extern char _stext_l1;
 #ifndef CONFIG_BFIN_BOOTROM_USES_EVT1
 	/* Build a NOP slide over the LDR jump block.  Whee! */
 	char nops[0xC];
 	serial_early_puts("NOP Slide\n");
 	memset(nops, 0x00, sizeof(nops));
-	memcpy(&_stext_l1 - sizeof(nops), nops, sizeof(nops));
+	memcpy((void *)L1_INST_SRAM, nops, sizeof(nops));
 #endif
 
 	if (!loaded_from_ldr) {
@@ -40,10 +39,10 @@ void cpu_init_f(ulong bootflag, ulong loaded_from_ldr)
 		 * checking at build time.
 		 */
 		serial_early_puts("L1 Relocate\n");
-		extern char _stext_l1, _etext_l1, _stext_l1_lma;
-		memcpy(&_stext_l1, &_stext_l1_lma, (&_etext_l1 - &_stext_l1));
-		extern char _sdata_l1, _edata_l1, _sdata_l1_lma;
-		memcpy(&_sdata_l1, &_sdata_l1_lma, (&_edata_l1 - &_sdata_l1));
+		extern char _stext_l1[], _text_l1_lma[], _text_l1_len[];
+		memcpy(&_stext_l1, &_text_l1_lma, (unsigned long)_text_l1_len);
+		extern char _sdata_l1[], _data_l1_lma[], _data_l1_len[];
+		memcpy(&_sdata_l1, &_data_l1_lma, (unsigned long)_data_l1_len);
 	}
 #if defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
 	/* The BF537 bootrom will reset the EBIU_AMGCTL register on us
diff --git a/cpu/blackfin/start.S b/cpu/blackfin/start.S
index 7cbd632..44e2725 100644
--- a/cpu/blackfin/start.S
+++ b/cpu/blackfin/start.S
@@ -139,11 +139,10 @@ ENTRY(_start)
 .Ldma_and_reprogram:
 	r0.l = LO(L1_INST_SRAM);
 	r0.h = HI(L1_INST_SRAM);
-	r1.l = __initcode_start;
-	r1.h = __initcode_start;
-	r2.l = __initcode_end;
-	r2.h = __initcode_end;
-	r2 = r2 - r1;	/* convert r2 into length of initcode */
+	r1.l = __initcode_lma;
+	r1.h = __initcode_lma;
+	r2.l = __initcode_len;
+	r2.h = __initcode_len;
 	r1 = r1 - r4;	/* convert r1 from load address of initcode ... */
 	r1 = r1 + r5;	/* ... to current (not load) address of initcode */
 	p3 = r0;
@@ -173,12 +172,11 @@ ENTRY(_start)
 	 * takes care of clearing things for us.
 	 */
 	serial_early_puts("Zero BSS");
-	r0.l = __bss_start;
-	r0.h = __bss_start;
+	r0.l = __bss_vma;
+	r0.h = __bss_vma;
 	r1 = 0 (x);
-	r2.l = __bss_end;
-	r2.h = __bss_end;
-	r2 = r2 - r0;
+	r2.l = __bss_len;
+	r2.h = __bss_len;
 	call _memset;
 
 .Lnorelocate:
diff --git a/lib_blackfin/u-boot.lds.S b/lib_blackfin/u-boot.lds.S
index 3604b78..8a9e8b1 100644
--- a/lib_blackfin/u-boot.lds.S
+++ b/lib_blackfin/u-boot.lds.S
@@ -65,16 +65,22 @@ MEMORY
 ENTRY(_start)
 SECTIONS
 {
-	.text :
+	.text.pre :
 	{
 		cpu/blackfin/start.o (.text .text.*)
 
 		LDS_BOARD_TEXT
+	} >ram_code
 
-		__initcode_start = .;
+	.text.init :
+	{
 		cpu/blackfin/initcode.o (.text .text.*)
-		__initcode_end = .;
+	} >ram_code
+	__initcode_lma = LOADADDR(.text.init);
+	__initcode_len = SIZEOF(.text.init);
 
+	.text :
+	{
 		*(.text .text.*)
 	} >ram
 
@@ -113,7 +119,9 @@ SECTIONS
 		. = ALIGN(4);
 		__etext_l1 = .;
 	} >l1_code AT>ram
-	__stext_l1_lma = LOADADDR(.text_l1);
+	__text_l1_lma = LOADADDR(.text_l1);
+	__text_l1_len = SIZEOF(.text_l1);
+	ASSERT (__text_l1_len <= L1_INST_SRAM_SIZE, "L1 text overflow!")
 
 	.data_l1 :
 	{
@@ -124,16 +132,18 @@ SECTIONS
 		. = ALIGN(4);
 		__edata_l1 = .;
 	} >l1_data AT>ram
-	__sdata_l1_lma = LOADADDR(.data_l1);
+	__data_l1_lma = LOADADDR(.data_l1);
+	__data_l1_len = SIZEOF(.data_l1);
+	ASSERT (__data_l1_len <= L1_DATA_B_SRAM_SIZE, "L1 data B overflow!")
 
 	.bss :
 	{
 		. = ALIGN(4);
-		__bss_start = .;
 		*(.sbss) *(.scommon)
 		*(.dynbss)
 		*(.bss .bss.*)
 		*(COMMON)
-		__bss_end = .;
 	} >ram
+	__bss_vma = ADDR(.bss);
+	__bss_len = SIZEOF(.bss);
 }
-- 
1.6.6