arch/m68k/kernel/asm-offsets.c

Source file repositories/reference/linux-study-clean/arch/m68k/kernel/asm-offsets.c

File Facts

System
Linux kernel
Corpus path
arch/m68k/kernel/asm-offsets.c
Extension
.c
Size
3966 bytes
Lines
110
Domain
Architecture Layer
Bucket
arch/m68k
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * This program is used to generate definitions needed by
 * assembly language modules.
 *
 * We use the technique used in the OSF Mach kernel code:
 * generate asm statements containing #defines,
 * compile this file to assembler, and then extract the
 * #defines from the assembly-language output.
 */

#define COMPILE_OFFSETS
#define ASM_OFFSETS_C

#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/kbuild.h>
#include <asm/bootinfo.h>
#include <asm/irq.h>
#include <asm/amigahw.h>
#include <linux/font.h>

int main(void)
{
	/* offsets into the task struct */
	DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
	DEFINE(TASK_MM, offsetof(struct task_struct, mm));
	DEFINE(TASK_STACK, offsetof(struct task_struct, stack));

	/* offsets into the thread struct */
	DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
	DEFINE(THREAD_USP, offsetof(struct thread_struct, usp));
	DEFINE(THREAD_SR, offsetof(struct thread_struct, sr));
	DEFINE(THREAD_FC, offsetof(struct thread_struct, fc));
	DEFINE(THREAD_CRP, offsetof(struct thread_struct, crp));
	DEFINE(THREAD_ESP0, offsetof(struct thread_struct, esp0));
	DEFINE(THREAD_FPREG, offsetof(struct thread_struct, fp));
	DEFINE(THREAD_FPCNTL, offsetof(struct thread_struct, fpcntl));
	DEFINE(THREAD_FPSTATE, offsetof(struct thread_struct, fpstate));

	/* offsets into the thread_info struct */
	DEFINE(TINFO_PREEMPT, offsetof(struct thread_info, preempt_count));
	DEFINE(TINFO_FLAGS, offsetof(struct thread_info, flags));

	/* offsets into the pt_regs */
	DEFINE(PT_OFF_D0, offsetof(struct pt_regs, d0));
	DEFINE(PT_OFF_ORIG_D0, offsetof(struct pt_regs, orig_d0));
	DEFINE(PT_OFF_D1, offsetof(struct pt_regs, d1));
	DEFINE(PT_OFF_D2, offsetof(struct pt_regs, d2));
	DEFINE(PT_OFF_D3, offsetof(struct pt_regs, d3));
	DEFINE(PT_OFF_D4, offsetof(struct pt_regs, d4));
	DEFINE(PT_OFF_D5, offsetof(struct pt_regs, d5));
	DEFINE(PT_OFF_A0, offsetof(struct pt_regs, a0));
	DEFINE(PT_OFF_A1, offsetof(struct pt_regs, a1));
	DEFINE(PT_OFF_A2, offsetof(struct pt_regs, a2));
	DEFINE(PT_OFF_PC, offsetof(struct pt_regs, pc));
	DEFINE(PT_OFF_SR, offsetof(struct pt_regs, sr));

	/* bitfields are a bit difficult */
#ifdef CONFIG_COLDFIRE
	DEFINE(PT_OFF_FORMATVEC, offsetof(struct pt_regs, sr) - 2);
#else
	DEFINE(PT_OFF_FORMATVEC, offsetof(struct pt_regs, pc) + 4);
#endif

	/* offsets into the irq_cpustat_t struct */
	DEFINE(CPUSTAT_SOFTIRQ_PENDING, offsetof(irq_cpustat_t, __softirq_pending));

	/* signal defines */
	DEFINE(LSIGSEGV, SIGSEGV);
	DEFINE(LSEGV_MAPERR, SEGV_MAPERR);
	DEFINE(LSIGTRAP, SIGTRAP);
	DEFINE(LTRAP_TRACE, TRAP_TRACE);

#ifdef CONFIG_MMU
	/* offsets into the bi_record struct */
	DEFINE(BIR_TAG, offsetof(struct bi_record, tag));
	DEFINE(BIR_SIZE, offsetof(struct bi_record, size));
	DEFINE(BIR_DATA, offsetof(struct bi_record, data));

	/* offsets into the font_desc struct */
	DEFINE(FONT_DESC_IDX, offsetof(struct font_desc, idx));
	DEFINE(FONT_DESC_NAME, offsetof(struct font_desc, name));
	DEFINE(FONT_DESC_WIDTH, offsetof(struct font_desc, width));
	DEFINE(FONT_DESC_HEIGHT, offsetof(struct font_desc, height));
	DEFINE(FONT_DESC_DATA, offsetof(struct font_desc, data));
	DEFINE(FONT_DESC_PREF, offsetof(struct font_desc, pref));

	/* offsets into the custom struct */

Annotation

Implementation Notes