arch/sparc/kernel/fpu_traps.S

Source file repositories/reference/linux-study-clean/arch/sparc/kernel/fpu_traps.S

File Facts

System
Linux kernel
Corpus path
arch/sparc/kernel/fpu_traps.S
Extension
.S
Size
8358 bytes
Lines
385
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: arch/sparc
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

.globl		do_fpdis
	.type		do_fpdis,#function
do_fpdis:
	sethi		%hi(TSTATE_PEF), %g4
	rdpr		%tstate, %g5
	andcc		%g5, %g4, %g0
	be,pt		%xcc, 1f
	 nop
	rd		%fprs, %g5
	andcc		%g5, FPRS_FEF, %g0
	be,pt		%xcc, 1f
	 nop

	/* Legal state when DCR_IFPOE is set in Cheetah %dcr. */
	sethi		%hi(109f), %g7
	ba,pt		%xcc, etrap
109:	 or		%g7, %lo(109b), %g7
	add		%g0, %g0, %g0
	ba,a,pt		%xcc, rtrap

1:	TRAP_LOAD_THREAD_REG(%g6, %g1)
	ldub		[%g6 + TI_FPSAVED], %g5
	wr		%g0, FPRS_FEF, %fprs
	andcc		%g5, FPRS_FEF, %g0
	be,a,pt		%icc, 1f
	 clr		%g7
	ldx		[%g6 + TI_GSR], %g7
1:	andcc		%g5, FPRS_DL, %g0
	bne,pn		%icc, 2f
	 fzero		%f0
	andcc		%g5, FPRS_DU, %g0
	bne,pn		%icc, 1f
	 fzero		%f2
	faddd		%f0, %f2, %f4
	fmuld		%f0, %f2, %f6
	faddd		%f0, %f2, %f8
	fmuld		%f0, %f2, %f10
	faddd		%f0, %f2, %f12
	fmuld		%f0, %f2, %f14
	faddd		%f0, %f2, %f16
	fmuld		%f0, %f2, %f18
	faddd		%f0, %f2, %f20
	fmuld		%f0, %f2, %f22
	faddd		%f0, %f2, %f24
	fmuld		%f0, %f2, %f26
	faddd		%f0, %f2, %f28
	fmuld		%f0, %f2, %f30
	faddd		%f0, %f2, %f32
	fmuld		%f0, %f2, %f34
	faddd		%f0, %f2, %f36
	fmuld		%f0, %f2, %f38
	faddd		%f0, %f2, %f40
	fmuld		%f0, %f2, %f42
	faddd		%f0, %f2, %f44
	fmuld		%f0, %f2, %f46
	faddd		%f0, %f2, %f48
	fmuld		%f0, %f2, %f50
	faddd		%f0, %f2, %f52
	fmuld		%f0, %f2, %f54
	faddd		%f0, %f2, %f56
	fmuld		%f0, %f2, %f58
	b,pt		%xcc, fpdis_exit2
	 faddd		%f0, %f2, %f60
1:	mov		SECONDARY_CONTEXT, %g3
	add		%g6, TI_FPREGS + 0x80, %g1
	faddd		%f0, %f2, %f4
	fmuld		%f0, %f2, %f6

661:	ldxa		[%g3] ASI_DMMU, %g5
	.section	.sun4v_1insn_patch, "ax"

Annotation

Implementation Notes