arch/sparc/kernel/utrap.S

File Facts

System

Linux kernel

Corpus path

arch/sparc/kernel/utrap.S

Extension

.S

Size

611 bytes

Lines

30

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.

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

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

.globl		utrap_trap
	.type		utrap_trap,#function
utrap_trap:		/* %g3=handler,%g4=level */
	TRAP_LOAD_THREAD_REG(%g6, %g1)
	ldx		[%g6 + TI_UTRAPS], %g1
	brnz,pt		%g1, invoke_utrap
	 nop

	ba,pt		%xcc, etrap
	 rd		%pc, %g7
	mov		%l4, %o1
        call		bad_trap
	 add		%sp, PTREGS_OFF, %o0
	ba,a,pt		%xcc, rtrap

invoke_utrap:
	sllx		%g3, 3, %g3
	ldx		[%g1 + %g3], %g1
	save		%sp, -128, %sp
	rdpr		%tstate, %l6
	rdpr		%cwp, %l7
	andn		%l6, TSTATE_CWP, %l6
	wrpr		%l6, %l7, %tstate
	rdpr		%tpc, %l6
	rdpr		%tnpc, %l7
	wrpr		%g1, 0, %tnpc
	done
	.size		utrap_trap,.-utrap_trap

Annotation

• Atlas domain: Architecture Layer / arch/sparc.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.