arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h

File Facts

System

Linux kernel

Corpus path

arch/xtensa/platforms/iss/include/platform/simcall-gdbio.h

Extension

.h

Size

738 bytes

Lines

35

Domain

Architecture Layer

Bucket

arch/xtensa

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.

Dependency Surface

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

Detected Declarations

• function __simc

Annotated Snippet

#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H
#define _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H

/*
 *  System call like services offered by the GDBIO host.
 */

#define SYS_open	-2
#define SYS_close	-3
#define SYS_read	-4
#define SYS_write	-5
#define SYS_lseek	-6

static int errno;

static inline int __simc(int a, int b, int c, int d)
{
	register int a1 asm("a2") = a;
	register int b1 asm("a6") = b;
	register int c1 asm("a3") = c;
	register int d1 asm("a4") = d;
	__asm__ __volatile__ (
			"break 1, 14\n"
			: "+r"(a1), "+r"(c1)
			: "r"(b1), "r"(d1)
			: "memory");
	errno = c1;
	return a1;
}

#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H */

Annotation

• Detected declarations: `function __simc`.
• Atlas domain: Architecture Layer / arch/xtensa.
• Implementation status: source implementation candidate.

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.