Merging the two ldscripts into one, creating better bss support, and cleaning the bss section in the boot phase.

3 files changed, 43 insertions, 267 deletions

diff --git a/arch/arm/lpc17xx/ldscript b/arch/arm/lpc17xx/ldscript
index fc283d4..2a1ce2b 100644
--- a/arch/arm/lpc17xx/ldscript
+++ b/arch/arm/lpc17xx/ldscript
@@ -48,12 +48,15 @@ PROVIDE(__rom_data_len = __rom_data_end - __rom_data_begin);
 PROVIDE(__heap_start = __cs3_heap_start);
 PROVIDE(__heap_end = __cs3_heap_end);
 
+PROVIDE(__bss_ram_len = __bss_ram_end - __bss_ram_begin);
+
 SECTIONS
 {
   .text :
   {
     CREATE_OBJECT_SYMBOLS
     __cs3_region_start_rom = .;
+    __privileged_code_start__ = . ;
     
     *(.cs3.region-head.rom)
     __cs3_interrupt_vector = __cs3_interrupt_vector_cortex_m;
@@ -67,6 +70,20 @@ SECTIONS
     *(.cs3.reset)
     /* Make sure we pulled in some reset code.  */
     ASSERT (. != __cs3_reset, "No reset code");
+    
+    *( .privileged_code )
+    *( privileged_functions )
+
+    __privileged_code_end___len = . - __privileged_code_start__ - 1 ;
+    __privileged_code_end___len |= __privileged_code_end___len >> 1 ;
+    __privileged_code_end___len |= __privileged_code_end___len >> 2 ;
+    __privileged_code_end___len |= __privileged_code_end___len >> 4 ;
+    __privileged_code_end___len |= __privileged_code_end___len >> 8 ;
+    __privileged_code_end___len |= __privileged_code_end___len >> 16 ;
+    . = ALIGN( MAX( __privileged_code_end___len + 1, 32 ) ) ;
+
+    __privileged_code_end__ = .;
+    __privileged_functions_end__ = .;
 
     *(.text .text.* .gnu.linkonce.t.*)
     *(.plt)
@@ -137,7 +154,7 @@ SECTIONS
   } >rom
   __cs3_region_size_rom = LENGTH(rom);
   __cs3_region_num = 1;
-
+  
   .data_begin :
   {
     . = ALIGN(8);
@@ -148,6 +165,17 @@ SECTIONS
   {
     __cs3_region_start_ram = .;
     __ram_data_begin = .;
+    __privileged_data_start__ = .;
+    *( privileged_data )
+    __privileged_data_end___len = . - __privileged_data_start__ - 1 ;
+    __privileged_data_end___len |= __privileged_data_end___len >> 1 ;
+    __privileged_data_end___len |= __privileged_data_end___len >> 2 ;
+    __privileged_data_end___len |= __privileged_data_end___len >> 4 ;
+    __privileged_data_end___len |= __privileged_data_end___len >> 8 ;
+    __privileged_data_end___len |= __privileged_data_end___len >> 16 ;
+    . = ALIGN( MAX( __privileged_data_end___len + 1, 32 ) ) ;
+
+    __privileged_data_end__ = .;
     *(.cs3.region-head.ram)
     KEEP(*(.jcr))
     *(.got.plt) *(.got)
@@ -157,21 +185,24 @@ SECTIONS
     . = ALIGN (8);
     _edata = .;
   } >ram AT>rom
+  .data_end :
+  {
+    . = ALIGN(8);
+    __rom_data_end = .;
+  } > rom
+
   .bss :
   {
+    __bss_ram_begin = .;
     *(.shbss)
     *(.bss .bss.* .gnu.linkonce.b.*)
     *(COMMON)
     *(.ram.b)
     . = ALIGN (8);
+    __bss_ram_end = .;
     _end = .;
     __end = .;
-  } >ram AT>rom
-  .data_end :
-  {
-    . = ALIGN(8);
-    __rom_data_end = .;
-  } > rom
+  } >ram
 
   /* This used for USB RAM section */
 	.usb_ram (NOLOAD):
diff --git a/arch/arm/lpc17xx/ldscript-mpu b/arch/arm/lpc17xx/ldscript-mpu
deleted file mode 100644
index 4f786d8..0000000
--- a/arch/arm/lpc17xx/ldscript-mpu
+++ /dev/null
@@ -1,260 +0,0 @@
-/* Linker script for Cortex-M3
- *
- * Version:CodeSourcery Sourcery G++ Lite 2007q3-53
- * BugURL:https://support.codesourcery.com/GNUToolchain/
- *
- *  Copyright 2007 CodeSourcery.
- *
- * The authors hereby grant permission to use, copy, modify, distribute,
- * and license this software and its documentation for any purpose, provided
- * that existing copyright notices are retained in all copies and that this
- * notice is included verbatim in any distributions. No written agreement,
- * license, or royalty fee is required for any of the authorized uses.
- * Modifications to this software may be copyrighted by their authors
- * and need not follow the licensing terms described here, provided that
- * the new terms are clearly indicated on the first page of each file where
- * they apply. */
-
-OUTPUT_FORMAT ("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
-/*ENTRY(_start)*/
-SEARCH_DIR(.)
-GROUP(-lgcc -lc)
-
-MEMORY
-{
-  rom (rx)  : ORIGIN = 0x00000000, LENGTH = 512K
-  ram (rwx) : ORIGIN = 0x10000000, LENGTH =  32K
-  
-  ram1(rwx) : ORIGIN = 0x2007C000, LENGTH = 16k
-  ram2(rwx) : ORIGIN = 0x20080000, LENGTH = 16k
-  ram3(rwx) : ORIGIN = 0x40038000, LENGTH = 2k
-}
-
-/* These force the linker to search for particular symbols from
- * the start of the link process and thus ensure the user's
- * overrides are picked up
- */
-EXTERN(__cs3_reset_cortex_m)
-EXTERN(__cs3_interrupt_vector_cortex_m)
-EXTERN(__cs3_start_c main __cs3_stack __cs3_stack_size __cs3_heap_end)
-
-PROVIDE(__cs3_stack = __cs3_region_start_ram + __cs3_region_size_ram);
-PROVIDE(__cs3_stack_size = __cs3_region_start_ram + __cs3_region_size_ram - _end);
-PROVIDE(__cs3_heap_start = _end);
-PROVIDE(__cs3_heap_end = __cs3_region_start_ram + __cs3_region_size_ram);
-
-PROVIDE(__rom_data_len = __rom_data_end - __rom_data_begin);
-
-PROVIDE(__heap_start = __cs3_heap_start);
-PROVIDE(__heap_end = __cs3_heap_end);
-
-SECTIONS
-{
-  .text :
-  {
-    CREATE_OBJECT_SYMBOLS
-    __cs3_region_start_rom = .;
-    __privileged_code_start__ = . ;
-    
-    *(.cs3.region-head.rom)
-    __cs3_interrupt_vector = __cs3_interrupt_vector_cortex_m;
-    *(.cs3.interrupt_vector)
-    /* Make sure we pulled in an interrupt vector.  */
-    ASSERT (. != __cs3_interrupt_vector_cortex_m, "No interrupt vector");
-    *(.rom)
-    *(.rom.b)
-
-    __cs3_reset = __cs3_reset_cortex_m;
-    *(.cs3.reset)
-    /* Make sure we pulled in some reset code.  */
-    ASSERT (. != __cs3_reset, "No reset code");
-    
-    *( .privileged_code )
-    *( privileged_functions )
-
-    __privileged_code_end___len = . - __privileged_code_start__ - 1 ;
-    __privileged_code_end___len |= __privileged_code_end___len >> 1 ;
-    __privileged_code_end___len |= __privileged_code_end___len >> 2 ;
-    __privileged_code_end___len |= __privileged_code_end___len >> 4 ;
-    __privileged_code_end___len |= __privileged_code_end___len >> 8 ;
-    __privileged_code_end___len |= __privileged_code_end___len >> 16 ;
-    . = ALIGN( MAX( __privileged_code_end___len + 1, 32 ) ) ;
-
-    __privileged_code_end__ = .;
-    __privileged_functions_end__ = .;
-
-    *(.text .text.* .gnu.linkonce.t.*)
-    *(.plt)
-    *(.gnu.warning)
-    *(.glue_7t) *(.glue_7) *(.vfp11_veneer)
-
-    *(.rodata .rodata.* .gnu.linkonce.r.*)
-
-    *(.ARM.extab* .gnu.linkonce.armextab.*)
-    *(.gcc_except_table)
-    *(.eh_frame_hdr)
-    *(.eh_frame)
-
-    . = ALIGN(4);
-    KEEP(*(.init))
-
-    . = ALIGN(4);
-    __preinit_array_start = .;
-    KEEP (*(.preinit_array))
-    __preinit_array_end = .;
-
-    . = ALIGN(4);
-    __init_array_start = .;
-    KEEP (*(SORT(.init_array.*)))
-    KEEP (*(.init_array))
-    __init_array_end = .;
-
-    . = ALIGN(0x4);
-    KEEP (*crtbegin.o(.ctors))
-    KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
-    KEEP (*(SORT(.ctors.*)))
-    KEEP (*crtend.o(.ctors))
-
-    . = ALIGN(4);
-    KEEP(*(.fini))
-
-    . = ALIGN(4);
-    __fini_array_start = .;
-    KEEP (*(.fini_array))
-    KEEP (*(SORT(.fini_array.*)))
-    __fini_array_end = .;
-
-    KEEP (*crtbegin.o(.dtors))
-    KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
-    KEEP (*(SORT(.dtors.*)))
-    KEEP (*crtend.o(.dtors))
-
-    . = ALIGN(4);
-    __cs3_regions = .;
-    LONG (0)
-    LONG (__cs3_region_init_ram)
-    LONG (__cs3_region_start_ram)
-    LONG (__cs3_region_init_size_ram)
-    LONG (__cs3_region_zero_size_ram)
-  }
-
-  /* .ARM.exidx is sorted, so has to go in its own output section.  */
-  __exidx_start = .;
-  .ARM.exidx :
-  {
-    *(.ARM.exidx* .gnu.linkonce.armexidx.*)
-  } >rom
-  __exidx_end = .;
-  .text.align :
-  {
-    . = ALIGN(8);
-    _etext = .;
-  } >rom
-  __cs3_region_size_rom = LENGTH(rom);
-  __cs3_region_num = 1;
-  
-  .data_begin :
-  {
-    . = ALIGN(8);
-    __rom_data_begin = .;
-  } > rom
-
-  .data :
-  {
-    __cs3_region_start_ram = .;
-    __ram_data_begin = .;
-    __privileged_data_start__ = .;
-    *( privileged_data )
-    __privileged_data_end___len = . - __privileged_data_start__ - 1 ;
-    __privileged_data_end___len |= __privileged_data_end___len >> 1 ;
-    __privileged_data_end___len |= __privileged_data_end___len >> 2 ;
-    __privileged_data_end___len |= __privileged_data_end___len >> 4 ;
-    __privileged_data_end___len |= __privileged_data_end___len >> 8 ;
-    __privileged_data_end___len |= __privileged_data_end___len >> 16 ;
-    . = ALIGN( MAX( __privileged_data_end___len + 1, 32 ) ) ;
-
-    __privileged_data_end__ = .;
-    *(.cs3.region-head.ram)
-    KEEP(*(.jcr))
-    *(.got.plt) *(.got)
-    *(.shdata)
-    *(.data .data.* .gnu.linkonce.d.*)
-    *(.ram)
-    . = ALIGN (8);
-    _edata = .;
-  } >ram AT>rom
-  .bss :
-  {
-    *(.shbss)
-    *(.bss .bss.* .gnu.linkonce.b.*)
-    *(COMMON)
-    *(.ram.b)
-    . = ALIGN (8);
-    _end = .;
-    __end = .;
-  } >ram AT>rom
-  .data_end :
-  {
-    . = ALIGN(8);
-    __rom_data_end = .;
-  } > rom
-
-  /* This used for USB RAM section */
-	.usb_ram (NOLOAD):
-	{
-		*.o (USB_RAM)
-	} > ram2
-  .heap (NOLOAD) :
-  {
-    *(.heap)
-  } >ram
-  .stack (__cs3_stack - __cs3_stack_size) (NOLOAD):
-  {
-    *(.stack)
-    _estack = .;
-    PROVIDE(estack = .);
-  } >ram
-
-  __cs3_region_init_ram = LOADADDR (.data);
-  __cs3_region_init_size_ram = _edata - __cs3_region_start_ram;
-  __cs3_region_zero_size_ram = _end - _edata;
-  __cs3_region_size_ram = LENGTH(ram);
-  __cs3_region_num = 1;
-  
-  __FLASH_segment_start__ = ORIGIN(rom);
-  __FLASH_segment_end__ = __FLASH_segment_start__ + LENGTH(rom);
-  __SRAM_segment_start__ = ORIGIN(ram);
-  __SRAM_segment_end__ = __SRAM_segment_start__ + LENGTH(ram);
-
-  .stab 0 (NOLOAD) : { *(.stab) }
-  .stabstr 0 (NOLOAD) : { *(.stabstr) }
-  /* DWARF debug sections.
-   * Symbols in the DWARF debugging sections are relative to the beginning
-   * of the section so we begin them at 0.  */
-  /* DWARF 1 */
-  .debug          0 : { *(.debug) }
-  .line           0 : { *(.line) }
-  /* GNU DWARF 1 extensions */
-  .debug_srcinfo  0 : { *(.debug_srcinfo) }
-  .debug_sfnames  0 : { *(.debug_sfnames) }
-  /* DWARF 1.1 and DWARF 2 */
-  .debug_aranges  0 : { *(.debug_aranges) }
-  .debug_pubnames 0 : { *(.debug_pubnames) }
-  /* DWARF 2 */
-  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
-  .debug_abbrev   0 : { *(.debug_abbrev) }
-  .debug_line     0 : { *(.debug_line) }
-  .debug_frame    0 : { *(.debug_frame) }
-  .debug_str      0 : { *(.debug_str) }
-  .debug_loc      0 : { *(.debug_loc) }
-  .debug_macinfo  0 : { *(.debug_macinfo) }
-  /* SGI/MIPS DWARF 2 extensions */
-  .debug_weaknames 0 : { *(.debug_weaknames) }
-  .debug_funcnames 0 : { *(.debug_funcnames) }
-  .debug_typenames 0 : { *(.debug_typenames) }
-  .debug_varnames  0 : { *(.debug_varnames) }
-
-  .note.gnu.arm.ident 0 : { KEEP (*(.note.gnu.arm.ident)) }
-  .ARM.attributes 0 : { KEEP (*(.ARM.attributes)) }
-  /DISCARD/ : { *(.note.GNU-stack) }
-}
diff --git a/arch/arm/lpc17xx/startup.s b/arch/arm/lpc17xx/startup.s
index 6ad4127..6aced2c 100644
--- a/arch/arm/lpc17xx/startup.s
+++ b/arch/arm/lpc17xx/startup.s
@@ -140,6 +140,11 @@ __cs3_reset_cortex_m:
     MOV     R2, R4
     BL      memcpy
     
+    LDR     R0, =__bss_ram_begin
+    MOV     R1, #0
+    LDR     R2, =__bss_ram_len
+    BL      memset
+    
     LDR     R0, =SystemInit
     BLX     R0
     LDR     R0,=_start