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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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35561bab76
The include/generated/asm-offsets.h is generated in Kbuild during compiling from arch/SRCARCH/kernel/asm-offsets.c. When we want to generate another similar offset header file, circular dependency can happen. For example, we want to generate a offset file include/generated/test.h, which is included in include/sched/sched.h. If we generate asm-offsets.h first, it will fail, as include/sched/sched.h is included in asm-offsets.c and include/generated/test.h doesn't exist; If we generate test.h first, it can't success neither, as include/generated/asm-offsets.h is included by it. In x86_64, the macro COMPILE_OFFSETS is used to avoid such circular dependency. We can generate asm-offsets.h first, and if the COMPILE_OFFSETS is defined, we don't include the "generated/test.h". And we define the macro COMPILE_OFFSETS for all the asm-offsets.c for this purpose. Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
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*/
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#define COMPILE_OFFSETS
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <linux/ptrace.h>
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#include <linux/hardirq.h>
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#include <linux/thread_info.h>
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#include <linux/kbuild.h>
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int main(void)
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{
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/* struct task_struct */
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OFFSET(TASK_THREAD, task_struct, thread);
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BLANK();
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/* struct thread_struct */
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OFFSET(THREAD_KSP, thread_struct, ksp);
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OFFSET(THREAD_KPSR, thread_struct, kpsr);
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BLANK();
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/* struct pt_regs */
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OFFSET(PT_ORIG_R2, pt_regs, orig_r2);
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OFFSET(PT_ORIG_R7, pt_regs, orig_r7);
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OFFSET(PT_R1, pt_regs, r1);
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OFFSET(PT_R2, pt_regs, r2);
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OFFSET(PT_R3, pt_regs, r3);
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OFFSET(PT_R4, pt_regs, r4);
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OFFSET(PT_R5, pt_regs, r5);
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OFFSET(PT_R6, pt_regs, r6);
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OFFSET(PT_R7, pt_regs, r7);
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OFFSET(PT_R8, pt_regs, r8);
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OFFSET(PT_R9, pt_regs, r9);
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OFFSET(PT_R10, pt_regs, r10);
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OFFSET(PT_R11, pt_regs, r11);
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OFFSET(PT_R12, pt_regs, r12);
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OFFSET(PT_R13, pt_regs, r13);
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OFFSET(PT_R14, pt_regs, r14);
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OFFSET(PT_R15, pt_regs, r15);
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OFFSET(PT_EA, pt_regs, ea);
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OFFSET(PT_RA, pt_regs, ra);
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OFFSET(PT_FP, pt_regs, fp);
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OFFSET(PT_SP, pt_regs, sp);
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OFFSET(PT_GP, pt_regs, gp);
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OFFSET(PT_ESTATUS, pt_regs, estatus);
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DEFINE(PT_REGS_SIZE, sizeof(struct pt_regs));
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BLANK();
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/* struct switch_stack */
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OFFSET(SW_R16, switch_stack, r16);
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OFFSET(SW_R17, switch_stack, r17);
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OFFSET(SW_R18, switch_stack, r18);
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OFFSET(SW_R19, switch_stack, r19);
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OFFSET(SW_R20, switch_stack, r20);
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OFFSET(SW_R21, switch_stack, r21);
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OFFSET(SW_R22, switch_stack, r22);
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OFFSET(SW_R23, switch_stack, r23);
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OFFSET(SW_FP, switch_stack, fp);
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OFFSET(SW_GP, switch_stack, gp);
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OFFSET(SW_RA, switch_stack, ra);
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DEFINE(SWITCH_STACK_SIZE, sizeof(struct switch_stack));
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BLANK();
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/* struct thread_info */
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OFFSET(TI_FLAGS, thread_info, flags);
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OFFSET(TI_PREEMPT_COUNT, thread_info, preempt_count);
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BLANK();
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return 0;
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}
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