/*
|
* Copyright (C) 2001 - 2007 Tensilica Inc.
|
*
|
* SPDX-License-Identifier: GPL-2.0+
|
*/
|
|
#ifndef _XTENSA_PTRACE_H
|
#define _XTENSA_PTRACE_H
|
|
#include <compiler.h>
|
|
/*
|
* Kernel stack
|
*
|
* +-----------------------+ -------- STACK_SIZE
|
* | register file | |
|
* +-----------------------+ |
|
* | struct pt_regs | |
|
* +-----------------------+ | ------ PT_REGS_OFFSET
|
* double : 16 bytes spill area : | ^
|
* exception :- - - - - - - - - - - -: | |
|
* frame : struct pt_regs : | |
|
* :- - - - - - - - - - - -: | |
|
* | | | |
|
* | memory stack | | |
|
* | | | |
|
* ~ ~ ~ ~
|
* ~ ~ ~ ~
|
* | | | |
|
* | | | |
|
* +-----------------------+ | | --- STACK_BIAS
|
* | struct task_struct | | | ^
|
* current --> +-----------------------+ | | |
|
* | struct thread_info | | | |
|
* +-----------------------+ --------
|
*/
|
|
#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
|
|
/* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables) */
|
|
#define EXC_TABLE_KSTK 0x004 /* Kernel Stack */
|
#define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */
|
#define EXC_TABLE_FIXUP 0x00c /* Fixup handler */
|
#define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */
|
#define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */
|
#define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */
|
#define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */
|
#define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */
|
#define EXC_TABLE_SIZE 0x400
|
|
/* Registers used by strace */
|
|
#define REG_A_BASE 0xfc000000
|
#define REG_AR_BASE 0x04000000
|
#define REG_PC 0x14000000
|
#define REG_PS 0x080000e6
|
#define REG_WB 0x08000048
|
#define REG_WS 0x08000049
|
#define REG_LBEG 0x08000000
|
#define REG_LEND 0x08000001
|
#define REG_LCOUNT 0x08000002
|
#define REG_SAR 0x08000003
|
#define REG_DEPC 0x080000c0
|
#define REG_EXCCAUSE 0x080000e8
|
#define REG_EXCVADDR 0x080000ee
|
#define SYSCALL_NR 0x1
|
|
#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
|
|
/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
|
|
#define PTRACE_GETREGS 12
|
#define PTRACE_SETREGS 13
|
#define PTRACE_GETFPREGS 14
|
#define PTRACE_SETFPREGS 15
|
#define PTRACE_GETFPREGSIZE 18
|
|
#ifndef __ASSEMBLY__
|
|
/*
|
* This struct defines the way the registers are stored on the
|
* kernel stack during a system call or other kernel entry.
|
*/
|
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 */
|
int reserved[1]; /* 64 */
|
|
/* Make sure the areg field is 16 bytes aligned */
|
int align[0] __aligned(16);
|
|
/* current register frame.
|
* Note: The ESF for kernel exceptions ends after 16 registers!
|
*/
|
unsigned long areg[16]; /* 128 (64) */
|
};
|
|
#ifdef __KERNEL__
|
|
# define task_pt_regs(tsk) ((struct pt_regs *) \
|
(task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
|
# define user_mode(regs) (((regs)->ps & 0x00000020) != 0)
|
# define instruction_pointer(regs) ((regs)->pc)
|
void show_regs(struct pt_regs *);
|
|
# ifndef CONFIG_SMP
|
# define profile_pc(regs) instruction_pointer(regs)
|
# endif
|
#endif /* __KERNEL__ */
|
|
#else /* __ASSEMBLY__ */
|
|
#ifdef __KERNEL__
|
# include <asm/asm-offsets.h>
|
#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
|
#endif
|
|
#endif /* !__ASSEMBLY__ */
|
#endif /* _XTENSA_PTRACE_H */
|
