linux-2.6.33/svc_entry()(arm)

参照元†

linux-2.6.33/svc_entry()

↑

説明†

パス: linux-2.6.33/arch/arm/kernel/entry-armv.S

FIXME: これは何？
- 説明

↑

実装†

	.macro	svc_entry, stack_hole=0
 UNWIND(.fnstart		)

- linux-2.6.33/UNWIND()

 UNWIND(.save {r0 - pc}		)
	sub	sp, sp, #(S_FRAME_SIZE + \stack_hole - 4)

- linux-2.6.33/S_FRAME_SIZE

#ifdef CONFIG_THUMB2_KERNEL

- linux-2.6.33/CONFIG_THUMB2_KERNEL

 SPFIX(	str	r0, [sp]	)	@ temporarily saved
 SPFIX(	mov	r0, sp		)
 SPFIX(	tst	r0, #4		)	@ test original stack alignment
 SPFIX(	ldr	r0, [sp]	)	@ restored

- linux-2.6.33/SPFIX()

#else
 SPFIX(	tst	sp, #4		)
#endif
 SPFIX(	subeq	sp, sp, #4	)
	stmia	sp, {r1 - r12}

	ldmia	r0, {r1 - r3}
	add	r5, sp, #S_SP - 4	@ here for interlock avoidance
	mov	r4, #-1			@  ""  ""      ""       ""
	add	r0, sp, #(S_FRAME_SIZE + \stack_hole - 4)
 SPFIX(	addeq	r0, r0, #4	)
	str	r1, [sp, #-4]!		@ save the "real" r0 copied
					@ from the exception stack

	mov	r1, lr

	@
	@ We are now ready to fill in the remaining blanks on the stack:
	@
	@  r0 - sp_svc
	@  r1 - lr_svc
	@  r2 - lr_<exception>, already fixed up for correct return/restart
	@  r3 - spsr_<exception>
	@  r4 - orig_r0 (see pt_regs definition in ptrace.h)
	@
	stmia	r5, {r0 - r4}

	asm_trace_hardirqs_off