arch/xtensa/kernel/vmlinux.lds.S

Source file repositories/reference/linux-study-clean/arch/xtensa/kernel/vmlinux.lds.S

File Facts

System
Linux kernel
Corpus path
arch/xtensa/kernel/vmlinux.lds.S
Extension
.S
Size
9201 bytes
Lines
389
Domain
Architecture Layer
Bucket
arch/xtensa
Inferred role
Architecture Layer: arch/xtensa
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#define RO_EXCEPTION_TABLE_ALIGN	16

#include <asm-generic/vmlinux.lds.h>
#include <asm/page.h>
#include <asm/thread_info.h>

#include <asm/core.h>
#include <asm/vectors.h>

OUTPUT_ARCH(xtensa)
ENTRY(_start)

#ifdef __XTENSA_EB__
jiffies = jiffies_64 + 4;
#else
jiffies = jiffies_64;
#endif

/* Note: In the following macros, it would be nice to specify only the
   vector name and section kind and construct "sym" and "section" using
   CPP concatenation, but that does not work reliably.  Concatenating a
   string with "." produces an invalid token.  CPP will not print a
   warning because it thinks this is an assembly file, but it leaves
   them as multiple tokens and there may or may not be whitespace
   between them.  */

/* Macro for a relocation entry */

#define RELOCATE_ENTRY(sym, section)		\
	LONG(sym ## _start);			\
	LONG(sym ## _end);			\
	LONG(LOADADDR(section))

#if !defined(CONFIG_VECTORS_ADDR) && XCHAL_HAVE_VECBASE
#define MERGED_VECTORS 1
#else
#define MERGED_VECTORS 0
#endif

/*
 * Macro to define a section for a vector. When MERGED_VECTORS is 0
 * code for every vector is located with other init data. At startup
 * time head.S copies code for every vector to its final position according
 * to description recorded in the corresponding RELOCATE_ENTRY.
 */

#define SECTION_VECTOR4(sym, section, addr, prevsec)			    \
  section addr : AT(((LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3)      \
  {									    \
    . = ALIGN(4);							    \
    sym ## _start = ABSOLUTE(.);		 			    \
    *(section)								    \
    sym ## _end = ABSOLUTE(.);						    \
  }

#define SECTION_VECTOR2(section, addr)					    \
  . = addr;								    \
  *(section)

/*
 *  Mapping of input sections to output sections when linking.
 */

SECTIONS
{
  . = KERNELOFFSET;
  /* .text section */

  _text = .;
  _stext = .;

Annotation

Implementation Notes