arch/x86/um/user-offsets.c
Source file repositories/reference/linux-study-clean/arch/x86/um/user-offsets.c
File Facts
- System
- Linux kernel
- Corpus path
arch/x86/um/user-offsets.c- Extension
.c- Size
- 1905 bytes
- Lines
- 80
- Domain
- Architecture Layer
- Bucket
- arch/x86
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
stdio.hstddef.hsignal.hpoll.hsys/mman.hsys/user.hlinux/ptrace.hasm/types.hlinux/kbuild.h
Detected Declarations
function foo
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stddef.h>
#include <signal.h>
#include <poll.h>
#include <sys/mman.h>
#include <sys/user.h>
#define __FRAME_OFFSETS
#include <linux/ptrace.h>
#include <asm/types.h>
#include <linux/kbuild.h>
#define DEFINE_LONGS(sym, val) \
COMMENT(#val " / sizeof(unsigned long)"); \
DEFINE(sym, val / sizeof(unsigned long))
/* workaround for a warning with -Wmissing-prototypes */
void foo(void);
void foo(void)
{
#ifdef __i386__
DEFINE(HOST_IP, EIP);
DEFINE(HOST_SP, UESP);
DEFINE(HOST_EFLAGS, EFL);
DEFINE(HOST_AX, EAX);
DEFINE(HOST_BX, EBX);
DEFINE(HOST_CX, ECX);
DEFINE(HOST_DX, EDX);
DEFINE(HOST_SI, ESI);
DEFINE(HOST_DI, EDI);
DEFINE(HOST_BP, EBP);
DEFINE(HOST_CS, CS);
DEFINE(HOST_SS, SS);
DEFINE(HOST_DS, DS);
DEFINE(HOST_FS, FS);
DEFINE(HOST_ES, ES);
DEFINE(HOST_GS, GS);
DEFINE(HOST_ORIG_AX, ORIG_EAX);
#else
DEFINE_LONGS(HOST_BX, RBX);
DEFINE_LONGS(HOST_CX, RCX);
DEFINE_LONGS(HOST_DI, RDI);
DEFINE_LONGS(HOST_SI, RSI);
DEFINE_LONGS(HOST_DX, RDX);
DEFINE_LONGS(HOST_BP, RBP);
DEFINE_LONGS(HOST_AX, RAX);
DEFINE_LONGS(HOST_R8, R8);
DEFINE_LONGS(HOST_R9, R9);
DEFINE_LONGS(HOST_R10, R10);
DEFINE_LONGS(HOST_R11, R11);
DEFINE_LONGS(HOST_R12, R12);
DEFINE_LONGS(HOST_R13, R13);
DEFINE_LONGS(HOST_R14, R14);
DEFINE_LONGS(HOST_R15, R15);
DEFINE_LONGS(HOST_ORIG_AX, ORIG_RAX);
DEFINE_LONGS(HOST_CS, CS);
DEFINE_LONGS(HOST_SS, SS);
DEFINE_LONGS(HOST_EFLAGS, EFLAGS);
#if 0
DEFINE_LONGS(HOST_FS, FS);
DEFINE_LONGS(HOST_GS, GS);
DEFINE_LONGS(HOST_DS, DS);
DEFINE_LONGS(HOST_ES, ES);
#endif
DEFINE_LONGS(HOST_IP, RIP);
DEFINE_LONGS(HOST_SP, RSP);
#endif
DEFINE(UM_FRAME_SIZE, sizeof(struct user_regs_struct));
DEFINE(UM_POLLIN, POLLIN);
DEFINE(UM_POLLPRI, POLLPRI);
DEFINE(UM_POLLOUT, POLLOUT);
DEFINE(UM_PROT_READ, PROT_READ);
DEFINE(UM_PROT_WRITE, PROT_WRITE);
DEFINE(UM_PROT_EXEC, PROT_EXEC);
}
Annotation
- Immediate include surface: `stdio.h`, `stddef.h`, `signal.h`, `poll.h`, `sys/mman.h`, `sys/user.h`, `linux/ptrace.h`, `asm/types.h`.
- Detected declarations: `function foo`.
- Atlas domain: Architecture Layer / arch/x86.
- 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.