arch/m68k/fpsp040/sto_res.S

Source file repositories/reference/linux-study-clean/arch/m68k/fpsp040/sto_res.S

File Facts

System
Linux kernel
Corpus path
arch/m68k/fpsp040/sto_res.S
Extension
.S
Size
1974 bytes
Lines
98
Domain
Architecture Layer
Bucket
arch/m68k
Inferred role
Architecture Layer: arch/m68k
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

bfextu		CMDREG1B(%a6){#13:#3},%d0	|extract cos destination
	cmpib		#3,%d0		|check for fp0/fp1 cases
	bles		c_fp0123
	fmovemx	%fp1-%fp1,-(%a7)
	moveql		#7,%d1
	subl		%d0,%d1		|d1 = 7- (dest. reg. no.)
	clrl		%d0
	bsetl		%d1,%d0		|d0 is dynamic register mask
	fmovemx	(%a7)+,%d0
	rts
c_fp0123:
	cmpib		#0,%d0
	beqs		c_is_fp0
	cmpib		#1,%d0
	beqs		c_is_fp1
	cmpib		#2,%d0
	beqs		c_is_fp2
c_is_fp3:
	fmovemx	%fp1-%fp1,USER_FP3(%a6)
	rts
c_is_fp2:
	fmovemx	%fp1-%fp1,USER_FP2(%a6)
	rts
c_is_fp1:
	fmovemx	%fp1-%fp1,USER_FP1(%a6)
	rts
c_is_fp0:
	fmovemx	%fp1-%fp1,USER_FP0(%a6)
	rts


	.global	sto_res
sto_res:
	bfextu		CMDREG1B(%a6){#6:#3},%d0	|extract destination register
	cmpib		#3,%d0		|check for fp0/fp1 cases
	bles		fp0123
	fmovemx	%fp0-%fp0,-(%a7)
	moveql		#7,%d1
	subl		%d0,%d1		|d1 = 7- (dest. reg. no.)
	clrl		%d0
	bsetl		%d1,%d0		|d0 is dynamic register mask
	fmovemx	(%a7)+,%d0
	rts
fp0123:
	cmpib		#0,%d0
	beqs		is_fp0
	cmpib		#1,%d0
	beqs		is_fp1
	cmpib		#2,%d0
	beqs		is_fp2
is_fp3:
	fmovemx	%fp0-%fp0,USER_FP3(%a6)
	rts
is_fp2:
	fmovemx	%fp0-%fp0,USER_FP2(%a6)
	rts
is_fp1:
	fmovemx	%fp0-%fp0,USER_FP1(%a6)
	rts
is_fp0:
	fmovemx	%fp0-%fp0,USER_FP0(%a6)
	rts

	|end

Annotation

Implementation Notes