arch/powerpc/kernel/vecemu.c

File Facts

System

Linux kernel

Corpus path

arch/powerpc/kernel/vecemu.c

Extension

.c

Size

8781 bytes

Lines

352

Domain

Architecture Layer

Bucket

arch/powerpc

Inferred role

Architecture Layer: implementation source

Status

source 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.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/errno.h
• linux/sched.h
• asm/ptrace.h
• asm/processor.h
• asm/switch_to.h
• linux/uaccess.h
• asm/inst.h

Detected Declarations

• function eexp2
• function log_2
• function ctsxs
• function ctuxs
• function rfiz
• function rfii
• function rfin
• function emulate_altivec

Annotated Snippet

switch (vc) {
		case 0:	/* vaddfp */
			vaddfp(&vrs[vd], &vrs[va], &vrs[vb]);
			break;
		case 1:	/* vsubfp */
			vsubfp(&vrs[vd], &vrs[va], &vrs[vb]);
			break;
		case 4:	/* vrefp */
			vrefp(&vrs[vd], &vrs[vb]);
			break;
		case 5:	/* vrsqrtefp */
			vrsqrtefp(&vrs[vd], &vrs[vb]);
			break;
		case 6:	/* vexptefp */
			for (i = 0; i < 4; ++i)
				vrs[vd].u[i] = eexp2(vrs[vb].u[i]);
			break;
		case 7:	/* vlogefp */
			for (i = 0; i < 4; ++i)
				vrs[vd].u[i] = elog2(vrs[vb].u[i]);
			break;
		case 8:		/* vrfin */
			for (i = 0; i < 4; ++i)
				vrs[vd].u[i] = rfin(vrs[vb].u[i]);
			break;
		case 9:		/* vrfiz */
			for (i = 0; i < 4; ++i)
				vrs[vd].u[i] = rfiz(vrs[vb].u[i]);
			break;
		case 10:	/* vrfip */
			for (i = 0; i < 4; ++i) {
				u32 x = vrs[vb].u[i];
				x = (x & 0x80000000)? rfiz(x): rfii(x);
				vrs[vd].u[i] = x;
			}
			break;
		case 11:	/* vrfim */
			for (i = 0; i < 4; ++i) {
				u32 x = vrs[vb].u[i];
				x = (x & 0x80000000)? rfii(x): rfiz(x);
				vrs[vd].u[i] = x;
			}
			break;
		case 14:	/* vctuxs */
			for (i = 0; i < 4; ++i)
				vrs[vd].u[i] = ctuxs(vrs[vb].u[i], va,
					&current->thread.vr_state.vscr.u[3]);
			break;
		case 15:	/* vctsxs */
			for (i = 0; i < 4; ++i)
				vrs[vd].u[i] = ctsxs(vrs[vb].u[i], va,
					&current->thread.vr_state.vscr.u[3]);
			break;
		default:
			return -EINVAL;
		}
		break;
	case 46:	/* vmaddfp */
		vmaddfp(&vrs[vd], &vrs[va], &vrs[vb], &vrs[vc]);
		break;
	case 47:	/* vnmsubfp */
		vnmsubfp(&vrs[vd], &vrs[va], &vrs[vb], &vrs[vc]);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/errno.h`, `linux/sched.h`, `asm/ptrace.h`, `asm/processor.h`, `asm/switch_to.h`, `linux/uaccess.h`, `asm/inst.h`.
• Detected declarations: `function eexp2`, `function log_2`, `function ctsxs`, `function ctuxs`, `function rfiz`, `function rfii`, `function rfin`, `function emulate_altivec`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: source implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.