bsps/powerpc: Use shared linker command file

Close #3339.

c/src/lib/libbsp/powerpc/qemuppc/start/start.S

@@ -3,13 +3,15 @@
 
 #include <bspopts.h>
 
-        #.section ".text"
-	.section .entry_point_section,"awx",@progbits
-        .global _start
+	.global bsp_interrupt_stack_start
+	.global bsp_interrupt_stack_end
+	.global _start
+
+	.section .bsp_start_text,"awx",@progbits
 
 _start:
-	lis   %r1,_stack@h
-	ori   %r1,%r1,_stack@l
+	lis   %r1,bsp_interrupt_stack_start@h
+	ori   %r1,%r1,bsp_interrupt_stack_start@l
 	/* Make sure stack is properly aligned */
 	li    %r3, CPU_STACK_ALIGNMENT - 1
 	andc  %r1, %r1, %r3
@@ -40,3 +42,11 @@ __eabi:
 _reset:
 	b _start
 	.size _reset, . - _reset
+
+	/* Start stack area */
+	.section ".bsp_rwextra", "aw", @nobits
+	.align 4
+	.space 4096
+bsp_interrupt_stack_start:
+	.space 32768
+bsp_interrupt_stack_end:

c/src/lib/libbsp/powerpc/qemuppc/startup/bspstart.c

@@ -44,7 +44,6 @@ uint32_t bsp_clicks_per_usec;
 extern char RamSize[];
 extern char bsp_interrupt_stack_start[];
 extern char bsp_interrupt_stack_end[];
-extern char bsp_interrupt_stack_size[];
 uint32_t BSP_mem_size = (uint32_t)RamSize;
 
 /* Default decrementer exception handler */
@@ -87,7 +86,7 @@ void bsp_start( void )
    * Initialize the interrupt related settings.
    */
   intrStackStart = (uintptr_t) bsp_interrupt_stack_start;
-  intrStackSize =  (uintptr_t) bsp_interrupt_stack_size;
+  intrStackSize =  (uintptr_t) bsp_interrupt_stack_end - intrStackStart;
 
   BSP_mem_size = (uint32_t )RamSize;
 

c/src/lib/libbsp/powerpc/qemuppc/startup/cmain.c

@@ -1,4 +1,5 @@
 #include <bsp/bootcard.h>
+#include <bsp/linker-symbols.h>
 
 static void
 __outb(int port, unsigned char v)
@@ -30,13 +31,6 @@ __bzero (unsigned char *d, int len)
     *d++ = 0;
 }
 
-extern unsigned char __sdata2_load[], __sdata2_start[], __sdata2_end[];
-extern unsigned char __data_load[], __data_start[], __data_end[];
-extern unsigned char __sdata_load[], __sdata_start[], __sdata_end[];
-extern unsigned char __sbss2_start[], __sbss2_end[];
-extern unsigned char __sbss_start[], __sbss_end[];
-extern unsigned char __bss_start[], __bss_end[];
-
 
 /*
  * Prototype this here because it is just the entry symbol and
@@ -49,12 +43,9 @@ void cmain (void)
   /*
    * init variable sections
    */
-  __memcpy (__sdata2_start, __sdata2_load, __sdata2_end - __sdata2_start);
-  __memcpy (__sdata_start , __sdata_load , __sdata_end  - __sdata_start);
-  __memcpy (__data_start  , __data_load  , __data_end   - __data_start);
-  __bzero (__sbss2_start  , __sbss2_end - __sbss2_start);
-  __bzero (__sbss_start   , __sbss_end  - __sbss_start);
-  __bzero (__bss_start    , __bss_end   - __bss_start);
+  __memcpy (bsp_section_data_begin, bsp_section_data_load_begin, (int)bsp_section_data_size);
+  __bzero (bsp_section_bss_begin, (int)bsp_section_bss_size);
+  __bzero (bsp_section_sbss_begin, (int)bsp_section_sbss_size);
   /* printk( "start of BSP\n"); */
   boot_card(0);
   /* printk( "end of BSP\n"); */