cregit-Linux how code gets into the kernel

Release 4.14 arch/ia64/kernel/entry.h

Directory: arch/ia64/kernel
/* SPDX-License-Identifier: GPL-2.0 */

/*
 * Preserved registers that are shared between code in ivt.S and
 * entry.S.  Be careful not to step on these!
 */

#define PRED_LEAVE_SYSCALL	1 
/* TRUE iff leave from syscall */

#define PRED_KERNEL_STACK	2 
/* returning to kernel-stacks? */

#define PRED_USER_STACK		3 
/* returning to user-stacks? */

#define PRED_SYSCALL		4 
/* inside a system call? */

#define PRED_NON_SYSCALL	5 
/* complement of PRED_SYSCALL */

#ifdef __ASSEMBLY__

# define PASTE2(x,y)	x##y

# define PASTE(x,y)	PASTE2(x,y)


# define pLvSys		PASTE(p,PRED_LEAVE_SYSCALL)

# define pKStk		PASTE(p,PRED_KERNEL_STACK)

# define pUStk		PASTE(p,PRED_USER_STACK)

# define pSys		PASTE(p,PRED_SYSCALL)

# define pNonSys	PASTE(p,PRED_NON_SYSCALL)
#endif


#define PT(f)		(IA64_PT_REGS_##f##_OFFSET)

#define SW(f)		(IA64_SWITCH_STACK_##f##_OFFSET)

#define SOS(f)		(IA64_SAL_OS_STATE_##f##_OFFSET)


#define PT_REGS_SAVES(off)			\
	.unwabi 3, 'i';                         \
        .fframe IA64_PT_REGS_SIZE+16+(off);     \
        .spillsp rp, PT(CR_IIP)+16+(off);       \
        .spillsp ar.pfs, PT(CR_IFS)+16+(off);   \
        .spillsp ar.unat, PT(AR_UNAT)+16+(off); \
        .spillsp ar.fpsr, PT(AR_FPSR)+16+(off); \
        .spillsp pr, PT(PR)+16+(off);


#define PT_REGS_UNWIND_INFO(off)		\
	.prologue;                              \
        PT_REGS_SAVES(off);                     \
        .body


#define SWITCH_STACK_SAVES(off)							\
	.savesp ar.unat,SW(CALLER_UNAT)+16+(off);                               \
        .savesp ar.fpsr,SW(AR_FPSR)+16+(off);                                   \
        .spillsp f2,SW(F2)+16+(off); .spillsp f3,SW(F3)+16+(off);               \
        .spillsp f4,SW(F4)+16+(off); .spillsp f5,SW(F5)+16+(off);               \
        .spillsp f16,SW(F16)+16+(off); .spillsp f17,SW(F17)+16+(off);           \
        .spillsp f18,SW(F18)+16+(off); .spillsp f19,SW(F19)+16+(off);           \
        .spillsp f20,SW(F20)+16+(off); .spillsp f21,SW(F21)+16+(off);           \
        .spillsp f22,SW(F22)+16+(off); .spillsp f23,SW(F23)+16+(off);           \
        .spillsp f24,SW(F24)+16+(off); .spillsp f25,SW(F25)+16+(off);           \
        .spillsp f26,SW(F26)+16+(off); .spillsp f27,SW(F27)+16+(off);           \
        .spillsp f28,SW(F28)+16+(off); .spillsp f29,SW(F29)+16+(off);           \
        .spillsp f30,SW(F30)+16+(off); .spillsp f31,SW(F31)+16+(off);           \
        .spillsp r4,SW(R4)+16+(off); .spillsp r5,SW(R5)+16+(off);               \
        .spillsp r6,SW(R6)+16+(off); .spillsp r7,SW(R7)+16+(off);               \
        .spillsp b0,SW(B0)+16+(off); .spillsp b1,SW(B1)+16+(off);               \
        .spillsp b2,SW(B2)+16+(off); .spillsp b3,SW(B3)+16+(off);               \
        .spillsp b4,SW(B4)+16+(off); .spillsp b5,SW(B5)+16+(off);               \
        .spillsp ar.pfs,SW(AR_PFS)+16+(off); .spillsp ar.lc,SW(AR_LC)+16+(off); \
        .spillsp @priunat,SW(AR_UNAT)+16+(off);                                 \
        .spillsp ar.rnat,SW(AR_RNAT)+16+(off);                                  \
        .spillsp ar.bspstore,SW(AR_BSPSTORE)+16+(off);                          \
        .spillsp pr,SW(PR)+16+(off)


#define DO_SAVE_SWITCH_STACK			\
	movl r28=1f;                            \
        ;;                                      \
        .fframe IA64_SWITCH_STACK_SIZE;         \
        adds sp=-IA64_SWITCH_STACK_SIZE,sp;     \
        mov.ret.sptk b7=r28,1f;                 \
        SWITCH_STACK_SAVES(0);                  \
        br.cond.sptk.many save_switch_stack;    \
1:


#define DO_LOAD_SWITCH_STACK			\
	movl r28=1f;                            \
        ;;                                      \
        invala;                                 \
        mov.ret.sptk b7=r28,1f;                 \
        br.cond.sptk.many load_switch_stack;    \
1:      .restore sp;                            \
        adds sp=IA64_SWITCH_STACK_SIZE,sp

Overall Contributors

PersonTokensPropCommitsCommitProp
David Mosberger-Tang6350.40%440.00%
Linus Torvalds (pre-git)4737.60%220.00%
Keith Owens75.60%110.00%
Linus Torvalds75.60%220.00%
Greg Kroah-Hartman10.80%110.00%
Total125100.00%10100.00%
Directory: arch/ia64/kernel
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