arch/xtensa/include/asm/ptrace.h

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

File Facts

System
Linux kernel
Corpus path
arch/xtensa/include/asm/ptrace.h
Extension
.h
Size
3323 bytes
Lines
117
Domain
Architecture Layer
Bucket
arch/xtensa
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 {
	unsigned long pc;		/*   4 */
	unsigned long ps;		/*   8 */
	unsigned long depc;		/*  12 */
	unsigned long exccause;		/*  16 */
	unsigned long excvaddr;		/*  20 */
	unsigned long debugcause;	/*  24 */
	unsigned long wmask;		/*  28 */
	unsigned long lbeg;		/*  32 */
	unsigned long lend;		/*  36 */
	unsigned long lcount;		/*  40 */
	unsigned long sar;		/*  44 */
	unsigned long windowbase;	/*  48 */
	unsigned long windowstart;	/*  52 */
	unsigned long syscall;		/*  56 */
	unsigned long icountlevel;	/*  60 */
	unsigned long scompare1;	/*  64 */
	unsigned long threadptr;	/*  68 */

	/* Additional configurable registers that are used by the compiler. */
	xtregs_opt_t xtregs_opt;

	/* current register frame.
	 * Note: The ESF for kernel exceptions ends after 16 registers!
	 */
	unsigned long areg[XCHAL_NUM_AREGS] __aligned(16);
};

# define arch_has_single_step()	(1)
# define task_pt_regs(tsk) ((struct pt_regs*) \
	(task_stack_page(tsk) + KERNEL_STACK_SIZE) - 1)
# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
# define instruction_pointer(regs) ((regs)->pc)
# define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \
					       (regs)->pc))

# ifndef CONFIG_SMP
#  define profile_pc(regs) instruction_pointer(regs)
# else
#  define profile_pc(regs)						\
	({								\
		in_lock_functions(instruction_pointer(regs)) ?		\
		return_pointer(regs) : instruction_pointer(regs);	\
	})
# endif

#define user_stack_pointer(regs) ((regs)->areg[1])

static inline unsigned long regs_return_value(struct pt_regs *regs)
{
	return regs->areg[2];
}

int do_syscall_trace_enter(struct pt_regs *regs);
void do_syscall_trace_leave(struct pt_regs *regs);

#else	/* __ASSEMBLER__ */

# include <asm/asm-offsets.h>
#define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)

#endif	/* !__ASSEMBLER__ */

#endif	/* _XTENSA_PTRACE_H */

Annotation

Implementation Notes