~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/frv/kernel/gdb-io.c

Version: ~ [ linux-5.4 ] ~ [ linux-5.3.13 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.86 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.156 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.203 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.202 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* gdb-io.c: FR403 GDB stub I/O
  2  *
  3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/string.h>
 13 #include <linux/kernel.h>
 14 #include <linux/signal.h>
 15 #include <linux/sched.h>
 16 #include <linux/mm.h>
 17 #include <linux/console.h>
 18 #include <linux/init.h>
 19 #include <linux/serial_reg.h>
 20 
 21 #include <asm/pgtable.h>
 22 #include <asm/irc-regs.h>
 23 #include <asm/timer-regs.h>
 24 #include <asm/gdb-stub.h>
 25 #include "gdb-io.h"
 26 
 27 #ifdef CONFIG_GDBSTUB_UART0
 28 #define __UART(X) (*(volatile uint8_t *)(UART0_BASE + (UART_##X)))
 29 #define __UART_IRR_NMI 0xff0f0000
 30 #else /* CONFIG_GDBSTUB_UART1 */
 31 #define __UART(X) (*(volatile uint8_t *)(UART1_BASE + (UART_##X)))
 32 #define __UART_IRR_NMI 0xfff00000
 33 #endif
 34 
 35 #define LSR_WAIT_FOR(STATE)                     \
 36 do {                                            \
 37         gdbstub_do_rx();                        \
 38 } while (!(__UART(LSR) & UART_LSR_##STATE))
 39 
 40 #define FLOWCTL_QUERY(LINE)     ({ __UART(MSR) & UART_MSR_##LINE; })
 41 #define FLOWCTL_CLEAR(LINE)     do { __UART(MCR) &= ~UART_MCR_##LINE; mb(); } while (0)
 42 #define FLOWCTL_SET(LINE)       do { __UART(MCR) |= UART_MCR_##LINE;  mb(); } while (0)
 43 
 44 #define FLOWCTL_WAIT_FOR(LINE)                  \
 45 do {                                            \
 46         gdbstub_do_rx();                        \
 47 } while(!FLOWCTL_QUERY(LINE))
 48 
 49 /*****************************************************************************/
 50 /*
 51  * initialise the GDB stub
 52  * - called with PSR.ET==0, so can't incur external interrupts
 53  */
 54 void gdbstub_io_init(void)
 55 {
 56         /* set up the serial port */
 57         __UART(LCR) = UART_LCR_WLEN8; /* 1N8 */
 58         __UART(FCR) =
 59                 UART_FCR_ENABLE_FIFO |
 60                 UART_FCR_CLEAR_RCVR |
 61                 UART_FCR_CLEAR_XMIT |
 62                 UART_FCR_TRIGGER_1;
 63 
 64         FLOWCTL_CLEAR(DTR);
 65         FLOWCTL_SET(RTS);
 66 
 67 //      gdbstub_set_baud(115200);
 68 
 69         /* we want to get serial receive interrupts */
 70         __UART(IER) = UART_IER_RDI | UART_IER_RLSI;
 71         mb();
 72 
 73         __set_IRR(6, __UART_IRR_NMI);   /* map ERRs and UARTx to NMI */
 74 
 75 } /* end gdbstub_io_init() */
 76 
 77 /*****************************************************************************/
 78 /*
 79  * set up the GDB stub serial port baud rate timers
 80  */
 81 void gdbstub_set_baud(unsigned baud)
 82 {
 83         unsigned value, high, low;
 84         u8 lcr;
 85 
 86         /* work out the divisor to give us the nearest higher baud rate */
 87         value = __serial_clock_speed_HZ / 16 / baud;
 88 
 89         /* determine the baud rate range */
 90         high = __serial_clock_speed_HZ / 16 / value;
 91         low = __serial_clock_speed_HZ / 16 / (value + 1);
 92 
 93         /* pick the nearest bound */
 94         if (low + (high - low) / 2 > baud)
 95                 value++;
 96 
 97         lcr = __UART(LCR);
 98         __UART(LCR) |= UART_LCR_DLAB;
 99         mb();
100         __UART(DLL) = value & 0xff;
101         __UART(DLM) = (value >> 8) & 0xff;
102         mb();
103         __UART(LCR) = lcr;
104         mb();
105 
106 } /* end gdbstub_set_baud() */
107 
108 /*****************************************************************************/
109 /*
110  * receive characters into the receive FIFO
111  */
112 void gdbstub_do_rx(void)
113 {
114         unsigned ix, nix;
115 
116         ix = gdbstub_rx_inp;
117 
118         while (__UART(LSR) & UART_LSR_DR) {
119                 nix = (ix + 2) & 0xfff;
120                 if (nix == gdbstub_rx_outp)
121                         break;
122 
123                 gdbstub_rx_buffer[ix++] = __UART(LSR);
124                 gdbstub_rx_buffer[ix++] = __UART(RX);
125                 ix = nix;
126         }
127 
128         gdbstub_rx_inp = ix;
129 
130         __clr_RC(15);
131         __clr_IRL();
132 
133 } /* end gdbstub_do_rx() */
134 
135 /*****************************************************************************/
136 /*
137  * wait for a character to come from the debugger
138  */
139 int gdbstub_rx_char(unsigned char *_ch, int nonblock)
140 {
141         unsigned ix;
142         u8 ch, st;
143 
144         *_ch = 0xff;
145 
146         if (gdbstub_rx_unget) {
147                 *_ch = gdbstub_rx_unget;
148                 gdbstub_rx_unget = 0;
149                 return 0;
150         }
151 
152  try_again:
153         gdbstub_do_rx();
154 
155         /* pull chars out of the buffer */
156         ix = gdbstub_rx_outp;
157         if (ix == gdbstub_rx_inp) {
158                 if (nonblock)
159                         return -EAGAIN;
160                 //watchdog_alert_counter = 0;
161                 goto try_again;
162         }
163 
164         st = gdbstub_rx_buffer[ix++];
165         ch = gdbstub_rx_buffer[ix++];
166         gdbstub_rx_outp = ix & 0x00000fff;
167 
168         if (st & UART_LSR_BI) {
169                 gdbstub_proto("### GDB Rx Break Detected ###\n");
170                 return -EINTR;
171         }
172         else if (st & (UART_LSR_FE|UART_LSR_OE|UART_LSR_PE)) {
173                 gdbstub_io("### GDB Rx Error (st=%02x) ###\n",st);
174                 return -EIO;
175         }
176         else {
177                 gdbstub_io("### GDB Rx %02x (st=%02x) ###\n",ch,st);
178                 *_ch = ch & 0x7f;
179                 return 0;
180         }
181 
182 } /* end gdbstub_rx_char() */
183 
184 /*****************************************************************************/
185 /*
186  * send a character to the debugger
187  */
188 void gdbstub_tx_char(unsigned char ch)
189 {
190         FLOWCTL_SET(DTR);
191         LSR_WAIT_FOR(THRE);
192 //      FLOWCTL_WAIT_FOR(CTS);
193 
194         if (ch == 0x0a) {
195                 __UART(TX) = 0x0d;
196                 mb();
197                 LSR_WAIT_FOR(THRE);
198 //              FLOWCTL_WAIT_FOR(CTS);
199         }
200         __UART(TX) = ch;
201         mb();
202 
203         FLOWCTL_CLEAR(DTR);
204 } /* end gdbstub_tx_char() */
205 
206 /*****************************************************************************/
207 /*
208  * send a character to the debugger
209  */
210 void gdbstub_tx_flush(void)
211 {
212         LSR_WAIT_FOR(TEMT);
213         LSR_WAIT_FOR(THRE);
214         FLOWCTL_CLEAR(DTR);
215 } /* end gdbstub_tx_flush() */
216 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp