Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2020 SiFive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/kgdb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/irqflags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <asm/gdb_xml.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/parse_asm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	NOT_KGDB_BREAK = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	KGDB_SW_BREAK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	KGDB_COMPILED_BREAK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	KGDB_SW_SINGLE_STEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static unsigned long stepped_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static unsigned int stepped_opcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #if __riscv_xlen == 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) /* C.JAL is an RV32C-only instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) DECLARE_INSN(c_jal, MATCH_C_JAL, MASK_C_JAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define is_c_jal_insn(opcode) 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) DECLARE_INSN(jalr, MATCH_JALR, MASK_JALR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) DECLARE_INSN(jal, MATCH_JAL, MASK_JAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) DECLARE_INSN(c_jr, MATCH_C_JR, MASK_C_JR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) DECLARE_INSN(c_jalr, MATCH_C_JALR, MASK_C_JALR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) DECLARE_INSN(c_j, MATCH_C_J, MASK_C_J)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) DECLARE_INSN(beq, MATCH_BEQ, MASK_BEQ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) DECLARE_INSN(bne, MATCH_BNE, MASK_BNE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) DECLARE_INSN(blt, MATCH_BLT, MASK_BLT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) DECLARE_INSN(bge, MATCH_BGE, MASK_BGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) DECLARE_INSN(bltu, MATCH_BLTU, MASK_BLTU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) DECLARE_INSN(bgeu, MATCH_BGEU, MASK_BGEU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) DECLARE_INSN(c_beqz, MATCH_C_BEQZ, MASK_C_BEQZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) DECLARE_INSN(c_bnez, MATCH_C_BNEZ, MASK_C_BNEZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) DECLARE_INSN(sret, MATCH_SRET, MASK_SRET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static int decode_register_index(unsigned long opcode, int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	return (opcode >> offset) & 0x1F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static int decode_register_index_short(unsigned long opcode, int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return ((opcode >> offset) & 0x7) + 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) /* Calculate the new address for after a step */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static int get_step_address(struct pt_regs *regs, unsigned long *next_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	unsigned long pc = regs->epc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	unsigned long *regs_ptr = (unsigned long *)regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	unsigned int rs1_num, rs2_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	int op_code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (get_kernel_nofault(op_code, (void *)pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if ((op_code & __INSN_LENGTH_MASK) != __INSN_LENGTH_GE_32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		if (is_c_jalr_insn(op_code) || is_c_jr_insn(op_code)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			rs1_num = decode_register_index(op_code, RVC_C2_RS1_OPOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			*next_addr = regs_ptr[rs1_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		} else if (is_c_j_insn(op_code) || is_c_jal_insn(op_code)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			*next_addr = EXTRACT_RVC_J_IMM(op_code) + pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		} else if (is_c_beqz_insn(op_code)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 			rs1_num = decode_register_index_short(op_code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 							      RVC_C1_RS1_OPOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 			if (!rs1_num || regs_ptr[rs1_num] == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				*next_addr = EXTRACT_RVC_B_IMM(op_code) + pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 				*next_addr = pc + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		} else if (is_c_bnez_insn(op_code)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			rs1_num =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			    decode_register_index_short(op_code, RVC_C1_RS1_OPOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			if (rs1_num && regs_ptr[rs1_num] != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 				*next_addr = EXTRACT_RVC_B_IMM(op_code) + pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 				*next_addr = pc + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			*next_addr = pc + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		if ((op_code & __INSN_OPCODE_MASK) == __INSN_BRANCH_OPCODE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			bool result = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			long imm = EXTRACT_BTYPE_IMM(op_code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			unsigned long rs1_val = 0, rs2_val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			rs1_num = decode_register_index(op_code, RVG_RS1_OPOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			rs2_num = decode_register_index(op_code, RVG_RS2_OPOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			if (rs1_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 				rs1_val = regs_ptr[rs1_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			if (rs2_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 				rs2_val = regs_ptr[rs2_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			if (is_beq_insn(op_code))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 				result = (rs1_val == rs2_val) ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			else if (is_bne_insn(op_code))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 				result = (rs1_val != rs2_val) ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			else if (is_blt_insn(op_code))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 				result =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 				    ((long)rs1_val <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 				     (long)rs2_val) ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 			else if (is_bge_insn(op_code))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				result =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 				    ((long)rs1_val >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 				     (long)rs2_val) ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			else if (is_bltu_insn(op_code))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 				result = (rs1_val < rs2_val) ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			else if (is_bgeu_insn(op_code))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 				result = (rs1_val >= rs2_val) ? true : false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 				*next_addr = imm + pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 				*next_addr = pc + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		} else if (is_jal_insn(op_code)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			*next_addr = EXTRACT_JTYPE_IMM(op_code) + pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		} else if (is_jalr_insn(op_code)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			rs1_num = decode_register_index(op_code, RVG_RS1_OPOFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			if (rs1_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 				*next_addr = ((unsigned long *)regs)[rs1_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			*next_addr += EXTRACT_ITYPE_IMM(op_code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		} else if (is_sret_insn(op_code)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			*next_addr = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			*next_addr = pc + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static int do_single_step(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/* Determine where the target instruction will send us to */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	unsigned long addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	int error = get_step_address(regs, &addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	/* Store the op code in the stepped address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	error = get_kernel_nofault(stepped_opcode, (void *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	stepped_address = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	/* Replace the op code with the break instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	error = copy_to_kernel_nofault((void *)stepped_address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				   arch_kgdb_ops.gdb_bpt_instr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 				   BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/* Flush and return */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (!error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		kgdb_single_step = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		atomic_set(&kgdb_cpu_doing_single_step,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			   raw_smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		stepped_address = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		stepped_opcode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Undo a single step */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static void undo_single_step(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (stepped_opcode != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		copy_to_kernel_nofault((void *)stepped_address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 				   (void *)&stepped_opcode, BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		flush_icache_range(stepped_address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 				   stepped_address + BREAK_INSTR_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	stepped_address = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	stepped_opcode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	kgdb_single_step = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	atomic_set(&kgdb_cpu_doing_single_step, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	{DBG_REG_ZERO, GDB_SIZEOF_REG, -1},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	{DBG_REG_RA, GDB_SIZEOF_REG, offsetof(struct pt_regs, ra)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	{DBG_REG_SP, GDB_SIZEOF_REG, offsetof(struct pt_regs, sp)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	{DBG_REG_GP, GDB_SIZEOF_REG, offsetof(struct pt_regs, gp)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	{DBG_REG_TP, GDB_SIZEOF_REG, offsetof(struct pt_regs, tp)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	{DBG_REG_T0, GDB_SIZEOF_REG, offsetof(struct pt_regs, t0)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	{DBG_REG_T1, GDB_SIZEOF_REG, offsetof(struct pt_regs, t1)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	{DBG_REG_T2, GDB_SIZEOF_REG, offsetof(struct pt_regs, t2)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	{DBG_REG_FP, GDB_SIZEOF_REG, offsetof(struct pt_regs, s0)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	{DBG_REG_S1, GDB_SIZEOF_REG, offsetof(struct pt_regs, a1)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	{DBG_REG_A0, GDB_SIZEOF_REG, offsetof(struct pt_regs, a0)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	{DBG_REG_A1, GDB_SIZEOF_REG, offsetof(struct pt_regs, a1)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	{DBG_REG_A2, GDB_SIZEOF_REG, offsetof(struct pt_regs, a2)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	{DBG_REG_A3, GDB_SIZEOF_REG, offsetof(struct pt_regs, a3)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	{DBG_REG_A4, GDB_SIZEOF_REG, offsetof(struct pt_regs, a4)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	{DBG_REG_A5, GDB_SIZEOF_REG, offsetof(struct pt_regs, a5)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	{DBG_REG_A6, GDB_SIZEOF_REG, offsetof(struct pt_regs, a6)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	{DBG_REG_A7, GDB_SIZEOF_REG, offsetof(struct pt_regs, a7)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	{DBG_REG_S2, GDB_SIZEOF_REG, offsetof(struct pt_regs, s2)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	{DBG_REG_S3, GDB_SIZEOF_REG, offsetof(struct pt_regs, s3)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	{DBG_REG_S4, GDB_SIZEOF_REG, offsetof(struct pt_regs, s4)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	{DBG_REG_S5, GDB_SIZEOF_REG, offsetof(struct pt_regs, s5)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	{DBG_REG_S6, GDB_SIZEOF_REG, offsetof(struct pt_regs, s6)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	{DBG_REG_S7, GDB_SIZEOF_REG, offsetof(struct pt_regs, s7)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	{DBG_REG_S8, GDB_SIZEOF_REG, offsetof(struct pt_regs, s8)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	{DBG_REG_S9, GDB_SIZEOF_REG, offsetof(struct pt_regs, s9)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	{DBG_REG_S10, GDB_SIZEOF_REG, offsetof(struct pt_regs, s10)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	{DBG_REG_S11, GDB_SIZEOF_REG, offsetof(struct pt_regs, s11)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	{DBG_REG_T3, GDB_SIZEOF_REG, offsetof(struct pt_regs, t3)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	{DBG_REG_T4, GDB_SIZEOF_REG, offsetof(struct pt_regs, t4)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	{DBG_REG_T5, GDB_SIZEOF_REG, offsetof(struct pt_regs, t5)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	{DBG_REG_T6, GDB_SIZEOF_REG, offsetof(struct pt_regs, t6)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	{DBG_REG_EPC, GDB_SIZEOF_REG, offsetof(struct pt_regs, epc)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	{DBG_REG_STATUS, GDB_SIZEOF_REG, offsetof(struct pt_regs, status)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	{DBG_REG_BADADDR, GDB_SIZEOF_REG, offsetof(struct pt_regs, badaddr)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	{DBG_REG_CAUSE, GDB_SIZEOF_REG, offsetof(struct pt_regs, cause)},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (regno >= DBG_MAX_REG_NUM || regno < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (dbg_reg_def[regno].offset != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		       dbg_reg_def[regno].size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		memset(mem, 0, dbg_reg_def[regno].size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	return dbg_reg_def[regno].name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (regno >= DBG_MAX_REG_NUM || regno < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (dbg_reg_def[regno].offset != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		       dbg_reg_def[regno].size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	/* Initialize to zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	memset((char *)gdb_regs, 0, NUMREGBYTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	gdb_regs[DBG_REG_SP_OFF] = task->thread.sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	gdb_regs[DBG_REG_FP_OFF] = task->thread.s[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	gdb_regs[DBG_REG_S1_OFF] = task->thread.s[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	gdb_regs[DBG_REG_S2_OFF] = task->thread.s[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	gdb_regs[DBG_REG_S3_OFF] = task->thread.s[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	gdb_regs[DBG_REG_S4_OFF] = task->thread.s[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	gdb_regs[DBG_REG_S5_OFF] = task->thread.s[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	gdb_regs[DBG_REG_S6_OFF] = task->thread.s[6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	gdb_regs[DBG_REG_S7_OFF] = task->thread.s[7];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	gdb_regs[DBG_REG_S8_OFF] = task->thread.s[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	gdb_regs[DBG_REG_S9_OFF] = task->thread.s[10];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	gdb_regs[DBG_REG_S10_OFF] = task->thread.s[11];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	gdb_regs[DBG_REG_EPC_OFF] = task->thread.ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	regs->epc = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) void kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 				char *remcom_out_buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (!strncmp(remcom_in_buffer, gdb_xfer_read_target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		     sizeof(gdb_xfer_read_target)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		strcpy(remcom_out_buffer, riscv_gdb_stub_target_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	else if (!strncmp(remcom_in_buffer, gdb_xfer_read_cpuxml,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			  sizeof(gdb_xfer_read_cpuxml)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		strcpy(remcom_out_buffer, riscv_gdb_stub_cpuxml);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static inline void kgdb_arch_update_addr(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 					 char *remcom_in_buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	ptr = &remcom_in_buffer[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	if (kgdb_hex2long(&ptr, &addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		regs->epc = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) int kgdb_arch_handle_exception(int vector, int signo, int err_code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			       char *remcom_in_buffer, char *remcom_out_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			       struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	undo_single_step(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	switch (remcom_in_buffer[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	case 'c':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	case 'D':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	case 'k':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		if (remcom_in_buffer[0] == 'c')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 			kgdb_arch_update_addr(regs, remcom_in_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	case 's':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		kgdb_arch_update_addr(regs, remcom_in_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		err = do_single_step(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static int kgdb_riscv_kgdbbreak(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	if (stepped_address == addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		return KGDB_SW_SINGLE_STEP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if (atomic_read(&kgdb_setting_breakpoint))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		if (addr == (unsigned long)&kgdb_compiled_break)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 			return KGDB_COMPILED_BREAK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	return kgdb_has_hit_break(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static int kgdb_riscv_notify(struct notifier_block *self, unsigned long cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 			     void *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	struct die_args *args = (struct die_args *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	struct pt_regs *regs = args->regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	if (user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	type = kgdb_riscv_kgdbbreak(regs->epc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (type == NOT_KGDB_BREAK && cmd == DIE_TRAP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	if (kgdb_handle_exception(type == KGDB_SW_SINGLE_STEP ? 0 : 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 				  args->signr, cmd, regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	if (type == KGDB_COMPILED_BREAK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		regs->epc += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	return NOTIFY_STOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static struct notifier_block kgdb_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	.notifier_call = kgdb_riscv_notify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) int kgdb_arch_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	register_die_notifier(&kgdb_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) void kgdb_arch_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	unregister_die_notifier(&kgdb_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)  * Global data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) #ifdef CONFIG_RISCV_ISA_C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) const struct kgdb_arch arch_kgdb_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	.gdb_bpt_instr = {0x02, 0x90},	/* c.ebreak */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) const struct kgdb_arch arch_kgdb_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	.gdb_bpt_instr = {0x73, 0x00, 0x10, 0x00},	/* ebreak */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) #endif