arch/sh/kernel/disassemble.c

File Facts

System

Linux kernel

Corpus path

arch/sh/kernel/disassemble.c

Extension

.c

Size

18969 bytes

Lines

573

Domain

Architecture Layer

Bucket

arch/sh

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/string.h
• linux/uaccess.h
• asm/ptrace.h

Detected Declarations

• function print_sh_insn
• function show_code

Annotated Snippet

if (i < 16) {
				if (nibs[n] == i)
					continue;
				goto fail;
			}
			switch (i) {
			case BRANCH_8:
				imm = (nibs[2] << 4) | (nibs[3]);
				if (imm & 0x80)
					imm |= ~0xff;
				imm = ((char)imm) * 2 + 4 ;
				goto ok;
			case BRANCH_12:
				imm = ((nibs[1]) << 8) | (nibs[2] << 4) | (nibs[3]);
				if (imm & 0x800)
					imm |= ~0xfff;
				imm = imm * 2 + 4;
				goto ok;
			case IMM_4:
				imm = nibs[3];
				goto ok;
			case IMM_4BY2:
				imm = nibs[3] <<1;
				goto ok;
			case IMM_4BY4:
				imm = nibs[3] <<2;
				goto ok;
			case IMM_8:
				imm = (nibs[2] << 4) | nibs[3];
				goto ok;
			case PCRELIMM_8BY2:
				imm = ((nibs[2] << 4) | nibs[3]) <<1;
				relmask = ~1;
				goto ok;
			case PCRELIMM_8BY4:
				imm = ((nibs[2] << 4) | nibs[3]) <<2;
				relmask = ~3;
				goto ok;
			case IMM_8BY2:
				imm = ((nibs[2] << 4) | nibs[3]) <<1;
				goto ok;
			case IMM_8BY4:
				imm = ((nibs[2] << 4) | nibs[3]) <<2;
				goto ok;
			case DISP_8:
				imm = (nibs[2] << 4) | (nibs[3]);
				goto ok;
			case DISP_4:
				imm = nibs[3];
				goto ok;
			case REG_N:
				rn = nibs[n];
				break;
			case REG_M:
				rm = nibs[n];
				break;
			case REG_NM:
				rn = (nibs[n] & 0xc) >> 2;
				rm = (nibs[n] & 0x3);
				break;
			case REG_B:
				rb = nibs[n] & 0x07;
				break;
			default:
				return;
			}
		}

	ok:
		pr_cont("%-8s  ", op->name);
		lastsp = (op->arg[0] == A_END);
		disp_pc = 0;
		for (n = 0; n < 6 && op->arg[n] != A_END; n++) {
			if (n && op->arg[1] != A_END)
				pr_cont(", ");
			switch (op->arg[n]) {
			case A_IMM:
				pr_cont("#%d", (char)(imm));
				break;
			case A_R0:
				pr_cont("r0");
				break;
			case A_REG_N:
				pr_cont("r%d", rn);
				break;
			case A_INC_N:
				pr_cont("@r%d+", rn);
				break;
			case A_DEC_N:
				pr_cont("@-r%d", rn);

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/string.h`, `linux/uaccess.h`, `asm/ptrace.h`.
• Detected declarations: `function print_sh_insn`, `function show_code`.
• Atlas domain: Architecture Layer / arch/sh.
• 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.