arch/powerpc/kernel/misc.S

Source file repositories/reference/linux-study-clean/arch/powerpc/kernel/misc.S

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kernel/misc.S
Extension
.S
Size
2338 bytes
Lines
119
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

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

#include <linux/export.h>
#include <asm/ppc_asm.h>
#include <asm/unistd.h>
#include <asm/asm-compat.h>
#include <asm/asm-offsets.h>

	.text

/*
 * Returns (address we are running at) - (address we were linked at)
 * for use before the text and data are mapped to KERNELBASE.

 * add_reloc_offset(x) returns x + reloc_offset().
 */

_GLOBAL(reloc_offset)
	li	r3, 0
_GLOBAL(add_reloc_offset)
	mflr	r0
	bcl	20,31,$+4
1:	mflr	r5
	PPC_LL	r4,(2f-1b)(r5)
	subf	r5,r4,r5
	add	r3,r3,r5
	mtlr	r0
	blr
_ASM_NOKPROBE_SYMBOL(reloc_offset)
_ASM_NOKPROBE_SYMBOL(add_reloc_offset)

	.align	3
2:	PPC_LONG 1b

_GLOBAL(setjmp)
	mflr	r0
	PPC_STL	r0,0(r3)
	PPC_STL	r1,SZL(r3)
	PPC_STL	r2,2*SZL(r3)
#ifdef CONFIG_PPC32
	mfcr	r12
	stmw	r12, 3*SZL(r3)
#else
	mfcr	r0
	PPC_STL	r0,3*SZL(r3)
	PPC_STL	r13,4*SZL(r3)
	PPC_STL	r14,5*SZL(r3)
	PPC_STL	r15,6*SZL(r3)
	PPC_STL	r16,7*SZL(r3)
	PPC_STL	r17,8*SZL(r3)
	PPC_STL	r18,9*SZL(r3)
	PPC_STL	r19,10*SZL(r3)
	PPC_STL	r20,11*SZL(r3)
	PPC_STL	r21,12*SZL(r3)
	PPC_STL	r22,13*SZL(r3)
	PPC_STL	r23,14*SZL(r3)
	PPC_STL	r24,15*SZL(r3)
	PPC_STL	r25,16*SZL(r3)
	PPC_STL	r26,17*SZL(r3)
	PPC_STL	r27,18*SZL(r3)
	PPC_STL	r28,19*SZL(r3)
	PPC_STL	r29,20*SZL(r3)
	PPC_STL	r30,21*SZL(r3)
	PPC_STL	r31,22*SZL(r3)
#endif
	li	r3,0
	blr

_GLOBAL(longjmp)
#ifdef CONFIG_PPC32
	lmw	r12, 3*SZL(r3)
	mtcrf	0x38, r12

Annotation

Implementation Notes