arch/arc/include/asm/ptrace.h

Source file repositories/reference/linux-study-clean/arch/arc/include/asm/ptrace.h

File Facts

System
Linux kernel
Corpus path
arch/arc/include/asm/ptrace.h
Extension
.h
Size
4497 bytes
Lines
178
Domain
Architecture Layer
Bucket
arch/arc
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

struct pt_regs {

	/* Real registers */
	unsigned long bta;	/* bta_l1, bta_l2, erbta */

	unsigned long lp_start, lp_end, lp_count;

	unsigned long status32;	/* status32_l1, status32_l2, erstatus */
	unsigned long ret;	/* ilink1, ilink2 or eret */
	unsigned long blink;
	unsigned long fp;
	unsigned long r26;	/* gp */

	unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;

	unsigned long sp;	/* User/Kernel depending on where we came from */
	unsigned long orig_r0;

	/*
	 * To distinguish bet excp, syscall, irq
	 * For traps and exceptions, Exception Cause Register.
	 * 	ECR: <00> <VV> <CC> <PP>
	 * 	Last word used by Linux for extra state mgmt (syscall-restart)
	 * For interrupts, use artificial ECR values to note current prio-level
	 */
	ecr_reg ecr;
};

struct callee_regs {
	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
};

#define MAX_REG_OFFSET offsetof(struct pt_regs, ecr)

#else

struct pt_regs {

	unsigned long orig_r0;

	ecr_reg ecr;		/* Exception Cause Reg */

	unsigned long bta;	/* erbta */

	unsigned long fp;
	unsigned long r30;
	unsigned long r12;
	unsigned long r26;	/* gp */

#ifdef CONFIG_ARC_HAS_ACCL_REGS
	unsigned long r58, r59;	/* ACCL/ACCH used by FPU / DSP MPY */
#endif
#ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS
	unsigned long DSP_CTRL;
#endif

	unsigned long sp;	/* user/kernel sp depending on entry  */

	/*------- Below list auto saved by h/w -----------*/
	unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;

	unsigned long blink;
	unsigned long lp_end, lp_start, lp_count;

	unsigned long ei, ldi, jli;

	unsigned long ret;
	unsigned long status32;
};

struct callee_regs {
	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
};

#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)

#endif

#define instruction_pointer(regs)	((regs)->ret)
#define profile_pc(regs)		instruction_pointer(regs)

/* return 1 if user mode or 0 if kernel mode */
#define user_mode(regs) (regs->status32 & STATUS_U_MASK)

#define user_stack_pointer(regs)\
({  unsigned int sp;		\
	if (user_mode(regs))	\
		sp = (regs)->sp;\
	else			\
		sp = -1;	\

Annotation

Implementation Notes