1 // SPDX-License-Identifier: GPL-2.0-only
7  * Copyright (C) 2000-2001 VERITAS Software Corporation.
8  * Copyright (C) 2002-2004 Timesys Corporation
9  * Copyright (C) 2003-2004 Amit S. Kale <[email protected]>
11  * Copyright (C) 2004-2006 Tom Rini <[email protected]>
12  * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
13  * Copyright (C) 2005-2009 Wind River Systems, Inc.
49 					sizeof(unsigned long) - 1) /
59 	int ret = -1;  in gdbstub_read_wait()
81 	int ret = dbg_io_ops->read_char();  in gdbstub_read_wait()
83 		ret = dbg_io_ops->read_char();  in gdbstub_read_wait()
87 /* scan for the sequence $<data>#<checksum> */
105 		xmitcsum = -1;  in get_packet()
112 		while (count < (BUFMAX - 1)) {  in get_packet()
127 				dbg_io_ops->write_char('-');  in get_packet()
130 				dbg_io_ops->write_char('+');  in get_packet()
131 			if (dbg_io_ops->flush)  in get_packet()
132 				dbg_io_ops->flush();  in get_packet()
139  * Send the packet in buffer.
152 		dbg_io_ops->write_char('$');  in put_packet()
157 			dbg_io_ops->write_char(ch);  in put_packet()
162 		dbg_io_ops->write_char('#');  in put_packet()
163 		dbg_io_ops->write_char(hex_asc_hi(checksum));  in put_packet()
164 		dbg_io_ops->write_char(hex_asc_lo(checksum));  in put_packet()
165 		if (dbg_io_ops->flush)  in put_packet()
166 			dbg_io_ops->flush();  in put_packet()
181 		 * the packet being sent, and stop trying to send this  in put_packet()
185 			dbg_io_ops->write_char('-');  in put_packet()
186 			if (dbg_io_ops->flush)  in put_packet()
187 				dbg_io_ops->flush();  in put_packet()
207 	/* Fill and send buffers... */  in gdbstub_msg_write()
212 		if ((len << 1) > (BUFMAX - 2))  in gdbstub_msg_write()
213 			wcount = (BUFMAX - 2) >> 1;  in gdbstub_msg_write()
224 		len -= wcount;  in gdbstub_msg_write()
253 		count--;  in kgdb_mem2hex()
276 	tmp_hex = tmp_raw - 1;  in kgdb_hex2mem()
278 		tmp_raw--;  in kgdb_hex2mem()
279 		*tmp_raw = hex_to_bin(*tmp_hex--);  in kgdb_hex2mem()
280 		*tmp_raw |= hex_to_bin(*tmp_hex--) << 4;  in kgdb_hex2mem()
298 	if (**ptr == '-') {  in kgdb_hex2long()
313 		*long_val = -*long_val;  in kgdb_hex2long()
320  * 0x7d escaped with 0x7d. Return -EFAULT on failure or 0 on success.
328 	while (count-- > 0) {  in kgdb_ebin2mem()
385 	return -EINVAL;  in write_mem_msg()
390 	error = -error;  in error_packet()
433 	 * Non-positive TIDs are remapped to the cpu shadow information  in getthread()
435 	if (tid == 0 || tid == -1)  in getthread()
436 		tid = -atomic_read(&kgdb_active) - 2;  in getthread()
437 	if (tid < -1 && tid > -NR_CPUS - 2) {  in getthread()
438 		if (kgdb_info[-tid - 2].task)  in getthread()
439 			return kgdb_info[-tid - 2].task;  in getthread()
441 			return idle_task(-tid - 2);  in getthread()
451 	 * but is nicely RCU locked - hence is a pretty resilient  in getthread()
460  * CPU shadow threads are mapped to -CPU - 2
467 	return -raw_smp_processor_id() - 2;  in shadow_pid()
482 	 * we clear out our breakpoints now in case  in gdb_cmd_status()
488 	hex_byte_pack(&remcom_out_buffer[1], ks->signo);  in gdb_cmd_status()
499 		thread = kgdb_info[ks->cpu].task;  in gdb_get_regs_helper()
500 		local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;  in gdb_get_regs_helper()
547 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_setregs()
549 		gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);  in gdb_cmd_setregs()
566 			error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_memread()
568 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_memread()
584 static char *gdb_hex_reg_helper(int regnum, char *out)  in gdb_hex_reg_helper()  argument
591 	return kgdb_mem2hex((char *)gdb_regs + offset, out,  in gdb_hex_reg_helper()
603 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_reg_get()
620 	    !dbg_get_reg(regnum, gdb_regs, ks->linux_regs)) {  in gdb_cmd_reg_set()
621 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_reg_set()
632 	dbg_set_reg(regnum, gdb_regs, ks->linux_regs);  in gdb_cmd_reg_set()
717 				ks->thr_query = 0;  in gdb_cmd_query()
718 				int_to_threadref(thref, -cpu - 2);  in gdb_cmd_query()
726 			if (i >= ks->thr_query && !finished) {  in gdb_cmd_query()
727 				int_to_threadref(thref, p->pid);  in gdb_cmd_query()
730 				ks->thr_query++;  in gdb_cmd_query()
731 				if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)  in gdb_cmd_query()
737 		*(--ptr) = '\0';  in gdb_cmd_query()
743 		ks->threadid = shadow_pid(current->pid);  in gdb_cmd_query()
744 		int_to_threadref(thref, ks->threadid);  in gdb_cmd_query()
751 		ks->threadid = 0;  in gdb_cmd_query()
753 		kgdb_hex2long(&ptr, &ks->threadid);  in gdb_cmd_query()
754 		if (!getthread(ks->linux_regs, ks->threadid)) {  in gdb_cmd_query()
755 			error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_query()
758 		if ((int)ks->threadid > 0) {  in gdb_cmd_query()
759 			kgdb_mem2hex(getthread(ks->linux_regs,  in gdb_cmd_query()
760 					ks->threadid)->comm,  in gdb_cmd_query()
766 					(int)(-ks->threadid - 2));  in gdb_cmd_query()
817 		kgdb_hex2long(&ptr, &ks->threadid);  in gdb_cmd_task()
818 		thread = getthread(ks->linux_regs, ks->threadid);  in gdb_cmd_task()
819 		if (!thread && ks->threadid > 0) {  in gdb_cmd_task()
820 			error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_task()
824 		ks->kgdb_usethreadid = ks->threadid;  in gdb_cmd_task()
829 		kgdb_hex2long(&ptr, &ks->threadid);  in gdb_cmd_task()
830 		if (!ks->threadid) {  in gdb_cmd_task()
833 			thread = getthread(ks->linux_regs, ks->threadid);  in gdb_cmd_task()
834 			if (!thread && ks->threadid > 0) {  in gdb_cmd_task()
835 				error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_task()
851 	kgdb_hex2long(&ptr, &ks->threadid);  in gdb_cmd_thread()
852 	thread = getthread(ks->linux_regs, ks->threadid);  in gdb_cmd_thread()
856 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_thread()
863 	 * Since GDB-5.3, it's been drafted that '0' is a software  in gdb_cmd_break()
891 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_break()
895 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_break()
900 		error_packet(remcom_out_buffer, -EINVAL);  in gdb_cmd_break()
910 			(int)length, *bpt_type - '0');  in gdb_cmd_break()
913 			(int) length, *bpt_type - '0');  in gdb_cmd_break()
929 		ks->pass_exception = 1;  in gdb_cmd_exception_pass()
934 		ks->pass_exception = 1;  in gdb_cmd_exception_pass()
948 	return -1;  in gdb_cmd_exception_pass()
961 	kgdb_usethread = kgdb_info[ks->cpu].task;  in gdb_serial_stub()
962 	ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);  in gdb_serial_stub()
963 	ks->pass_exception = 0;  in gdb_serial_stub()
972 		ptr = hex_byte_pack(ptr, ks->signo);  in gdb_serial_stub()
974 		int_to_threadref(thref, shadow_pid(current->pid));  in gdb_serial_stub()
983 		/* Clear the out buffer. */  in gdb_serial_stub()
995 		case 'G': /* set the value of the CPU registers - return OK */  in gdb_serial_stub()
1058 				error_packet(remcom_out_buffer, -EINVAL);  in gdb_serial_stub()
1064 			error = kgdb_arch_handle_exception(ks->ex_vector,  in gdb_serial_stub()
1065 						ks->signo,  in gdb_serial_stub()
1066 						ks->err_code,  in gdb_serial_stub()
1069 						ks->linux_regs);  in gdb_serial_stub()
1087 	if (ks->pass_exception)  in gdb_serial_stub()
1098 		error = kgdb_arch_handle_exception(ks->ex_vector,  in gdbstub_state()
1099 						   ks->signo,  in gdbstub_state()
1100 						   ks->err_code,  in gdbstub_state()
1103 						   ks->linux_regs);  in gdbstub_state()
1115 	dbg_io_ops->write_char('+');  in gdbstub_state()
1121  * gdbstub_exit - Send an exit message to GDB
1140 	dbg_io_ops->write_char('$');  in gdbstub_exit()
1146 		dbg_io_ops->write_char(ch);  in gdbstub_exit()
1149 	dbg_io_ops->write_char('#');  in gdbstub_exit()
1150 	dbg_io_ops->write_char(hex_asc_hi(checksum));  in gdbstub_exit()
1151 	dbg_io_ops->write_char(hex_asc_lo(checksum));  in gdbstub_exit()
1154 	if (dbg_io_ops->flush)  in gdbstub_exit()
1155 		dbg_io_ops->flush();  in gdbstub_exit()