From: "Suzuki K. Poulose" <[email protected]> Attached is a sample program that fetches all the emulated cpu feature registers and traps on accessing an invalid id register.
--- /* * show_sysregs_all: Sample program to retrieve the * CPU feature registers. * * Author: Suzuki K. Poulose <[email protected]> * * Copyright (C) 2015 ARM Ltd. * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> /// /* Copied from asm/sysreg.h */ #define sys_reg(op0, op1, crn, crm, op2) \ ((((op0)&3)<<19)|((op1)<<16)|((crn)<<12)|((crm)<<8)|((op2)<<5)) asm( " .irp num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n" " .equ __reg_num_x\\num, \\num\n" " .endr\n" " .equ __reg_num_xzr, 31\n" "\n" " .macro mrs_s, rt, sreg\n" " .inst 0xd5200000|(\\sreg)|(__reg_num_\\rt)\n" " .endm\n" "\n" " .macro msr_s, sreg, rt\n" " .inst 0xd5000000|(\\sreg)|(__reg_num_\\rt)\n" " .endm\n" ); /// #define get_cpu_ftr(id) ({ \ unsigned long long __val; \ asm("mrs %0, "#id : "=r" (__val)); \ printf("%-20s: 0x%016lx\n", #id, __val); \ }) #define __get_id_reg(id) ({ \ unsigned long long __val; \ asm("mrs_s %0, "#id : "=r" (__val)); \ printf("%-20s: 0x%016lx\n", get_id_str(id), __val); \ }) #define get_id_reg(x) __get_id_reg(x) #define get_id_range(CRm) \ get_id_reg(sys_reg(3, 0, 0, CRm, 0)); \ get_id_reg(sys_reg(3, 0, 0, CRm, 1)); \ get_id_reg(sys_reg(3, 0, 0, CRm, 2)); \ get_id_reg(sys_reg(3, 0, 0, CRm, 3)); \ get_id_reg(sys_reg(3, 0, 0, CRm, 4)); \ get_id_reg(sys_reg(3, 0, 0, CRm, 5)); \ get_id_reg(sys_reg(3, 0, 0, CRm, 6)); \ get_id_reg(sys_reg(3, 0, 0, CRm, 7)); #define Op0(id) (((id) >> 19) & 0x3) #define Op1(id) (((id) >> 16) & 0x7) #define CRn(id) (((id) >> 12) & 0xf) #define CRm(id) (((id) >> 8) & 0xf) #define Op2(id) (((id) >> 5) & 0x7) char *get_id_str(int id) { static char buf[64]; sprintf(buf, "S%d_%d_%d_%d_%d", Op0(id), Op1(id), CRn(id), CRm(id), Op2(id)); return buf; } main() { get_id_range(1); get_id_range(2); get_id_range(3); get_id_range(4); get_id_range(5); get_id_range(6); get_id_range(7); get_cpu_ftr(MIDR_EL1); get_cpu_ftr(REVIDR_EL1); get_cpu_ftr(MPIDR_EL1); /* Trap */ get_id_reg(sys_reg(3, 0, 0, 0, 2)); return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
