1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Copyright (C) 2001 - 2007 Tensilica Inc. 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifndef _XTENSA_PTRACE_H 8*4882a593Smuzhiyun #define _XTENSA_PTRACE_H 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <compiler.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun /* 13*4882a593Smuzhiyun * Kernel stack 14*4882a593Smuzhiyun * 15*4882a593Smuzhiyun * +-----------------------+ -------- STACK_SIZE 16*4882a593Smuzhiyun * | register file | | 17*4882a593Smuzhiyun * +-----------------------+ | 18*4882a593Smuzhiyun * | struct pt_regs | | 19*4882a593Smuzhiyun * +-----------------------+ | ------ PT_REGS_OFFSET 20*4882a593Smuzhiyun * double : 16 bytes spill area : | ^ 21*4882a593Smuzhiyun * exception :- - - - - - - - - - - -: | | 22*4882a593Smuzhiyun * frame : struct pt_regs : | | 23*4882a593Smuzhiyun * :- - - - - - - - - - - -: | | 24*4882a593Smuzhiyun * | | | | 25*4882a593Smuzhiyun * | memory stack | | | 26*4882a593Smuzhiyun * | | | | 27*4882a593Smuzhiyun * ~ ~ ~ ~ 28*4882a593Smuzhiyun * ~ ~ ~ ~ 29*4882a593Smuzhiyun * | | | | 30*4882a593Smuzhiyun * | | | | 31*4882a593Smuzhiyun * +-----------------------+ | | --- STACK_BIAS 32*4882a593Smuzhiyun * | struct task_struct | | | ^ 33*4882a593Smuzhiyun * current --> +-----------------------+ | | | 34*4882a593Smuzhiyun * | struct thread_info | | | | 35*4882a593Smuzhiyun * +-----------------------+ -------- 36*4882a593Smuzhiyun */ 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun #define KERNEL_STACK_SIZE (2 * PAGE_SIZE) 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun /* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables) */ 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun #define EXC_TABLE_KSTK 0x004 /* Kernel Stack */ 43*4882a593Smuzhiyun #define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */ 44*4882a593Smuzhiyun #define EXC_TABLE_FIXUP 0x00c /* Fixup handler */ 45*4882a593Smuzhiyun #define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */ 46*4882a593Smuzhiyun #define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */ 47*4882a593Smuzhiyun #define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */ 48*4882a593Smuzhiyun #define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */ 49*4882a593Smuzhiyun #define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */ 50*4882a593Smuzhiyun #define EXC_TABLE_SIZE 0x400 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun /* Registers used by strace */ 53*4882a593Smuzhiyun 54*4882a593Smuzhiyun #define REG_A_BASE 0xfc000000 55*4882a593Smuzhiyun #define REG_AR_BASE 0x04000000 56*4882a593Smuzhiyun #define REG_PC 0x14000000 57*4882a593Smuzhiyun #define REG_PS 0x080000e6 58*4882a593Smuzhiyun #define REG_WB 0x08000048 59*4882a593Smuzhiyun #define REG_WS 0x08000049 60*4882a593Smuzhiyun #define REG_LBEG 0x08000000 61*4882a593Smuzhiyun #define REG_LEND 0x08000001 62*4882a593Smuzhiyun #define REG_LCOUNT 0x08000002 63*4882a593Smuzhiyun #define REG_SAR 0x08000003 64*4882a593Smuzhiyun #define REG_DEPC 0x080000c0 65*4882a593Smuzhiyun #define REG_EXCCAUSE 0x080000e8 66*4882a593Smuzhiyun #define REG_EXCVADDR 0x080000ee 67*4882a593Smuzhiyun #define SYSCALL_NR 0x1 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun #define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1) 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun /* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */ 72*4882a593Smuzhiyun 73*4882a593Smuzhiyun #define PTRACE_GETREGS 12 74*4882a593Smuzhiyun #define PTRACE_SETREGS 13 75*4882a593Smuzhiyun #define PTRACE_GETFPREGS 14 76*4882a593Smuzhiyun #define PTRACE_SETFPREGS 15 77*4882a593Smuzhiyun #define PTRACE_GETFPREGSIZE 18 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun /* 82*4882a593Smuzhiyun * This struct defines the way the registers are stored on the 83*4882a593Smuzhiyun * kernel stack during a system call or other kernel entry. 84*4882a593Smuzhiyun */ 85*4882a593Smuzhiyun struct pt_regs { 86*4882a593Smuzhiyun unsigned long pc; /* 4 */ 87*4882a593Smuzhiyun unsigned long ps; /* 8 */ 88*4882a593Smuzhiyun unsigned long depc; /* 12 */ 89*4882a593Smuzhiyun unsigned long exccause; /* 16 */ 90*4882a593Smuzhiyun unsigned long excvaddr; /* 20 */ 91*4882a593Smuzhiyun unsigned long debugcause; /* 24 */ 92*4882a593Smuzhiyun unsigned long wmask; /* 28 */ 93*4882a593Smuzhiyun unsigned long lbeg; /* 32 */ 94*4882a593Smuzhiyun unsigned long lend; /* 36 */ 95*4882a593Smuzhiyun unsigned long lcount; /* 40 */ 96*4882a593Smuzhiyun unsigned long sar; /* 44 */ 97*4882a593Smuzhiyun unsigned long windowbase; /* 48 */ 98*4882a593Smuzhiyun unsigned long windowstart; /* 52 */ 99*4882a593Smuzhiyun unsigned long syscall; /* 56 */ 100*4882a593Smuzhiyun unsigned long icountlevel; /* 60 */ 101*4882a593Smuzhiyun int reserved[1]; /* 64 */ 102*4882a593Smuzhiyun 103*4882a593Smuzhiyun /* Make sure the areg field is 16 bytes aligned */ 104*4882a593Smuzhiyun int align[0] __aligned(16); 105*4882a593Smuzhiyun 106*4882a593Smuzhiyun /* current register frame. 107*4882a593Smuzhiyun * Note: The ESF for kernel exceptions ends after 16 registers! 108*4882a593Smuzhiyun */ 109*4882a593Smuzhiyun unsigned long areg[16]; /* 128 (64) */ 110*4882a593Smuzhiyun }; 111*4882a593Smuzhiyun 112*4882a593Smuzhiyun #ifdef __KERNEL__ 113*4882a593Smuzhiyun 114*4882a593Smuzhiyun # define task_pt_regs(tsk) ((struct pt_regs *) \ 115*4882a593Smuzhiyun (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 116*4882a593Smuzhiyun # define user_mode(regs) (((regs)->ps & 0x00000020) != 0) 117*4882a593Smuzhiyun # define instruction_pointer(regs) ((regs)->pc) 118*4882a593Smuzhiyun void show_regs(struct pt_regs *); 119*4882a593Smuzhiyun 120*4882a593Smuzhiyun # ifndef CONFIG_SMP 121*4882a593Smuzhiyun # define profile_pc(regs) instruction_pointer(regs) 122*4882a593Smuzhiyun # endif 123*4882a593Smuzhiyun #endif /* __KERNEL__ */ 124*4882a593Smuzhiyun 125*4882a593Smuzhiyun #else /* __ASSEMBLY__ */ 126*4882a593Smuzhiyun 127*4882a593Smuzhiyun #ifdef __KERNEL__ 128*4882a593Smuzhiyun # include <asm/asm-offsets.h> 129*4882a593Smuzhiyun #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 130*4882a593Smuzhiyun #endif 131*4882a593Smuzhiyun 132*4882a593Smuzhiyun #endif /* !__ASSEMBLY__ */ 133*4882a593Smuzhiyun #endif /* _XTENSA_PTRACE_H */ 134