![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
260 lines
6 KiB
C
260 lines
6 KiB
C
/* debug-stub.c: debug-mode stub
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/serial_reg.h>
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#include <asm/system.h>
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#include <asm/serial-regs.h>
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#include <asm/timer-regs.h>
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#include <asm/irc-regs.h>
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#include <asm/gdb-stub.h>
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#include "gdb-io.h"
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/* CPU board CON5 */
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#define __UART0(X) (*(volatile uint8_t *)(UART0_BASE + (UART_##X)))
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#define LSR_WAIT_FOR0(STATE) \
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do { \
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} while (!(__UART0(LSR) & UART_LSR_##STATE))
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#define FLOWCTL_QUERY0(LINE) ({ __UART0(MSR) & UART_MSR_##LINE; })
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#define FLOWCTL_CLEAR0(LINE) do { __UART0(MCR) &= ~UART_MCR_##LINE; } while (0)
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#define FLOWCTL_SET0(LINE) do { __UART0(MCR) |= UART_MCR_##LINE; } while (0)
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#define FLOWCTL_WAIT_FOR0(LINE) \
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do { \
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gdbstub_do_rx(); \
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} while(!FLOWCTL_QUERY(LINE))
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static void __init debug_stub_init(void);
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extern asmlinkage void __break_hijack_kernel_event(void);
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extern asmlinkage void __break_hijack_kernel_event_breaks_here(void);
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/*****************************************************************************/
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/*
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* debug mode handler stub
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* - we come here with the CPU in debug mode and with exceptions disabled
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* - handle debugging services for userspace
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*/
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asmlinkage void debug_stub(void)
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{
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unsigned long hsr0;
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int type = 0;
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static u8 inited = 0;
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if (!inited) {
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debug_stub_init();
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type = -1;
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inited = 1;
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}
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hsr0 = __get_HSR(0);
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if (hsr0 & HSR0_ETMD)
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__set_HSR(0, hsr0 & ~HSR0_ETMD);
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/* disable single stepping */
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__debug_regs->dcr &= ~DCR_SE;
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/* kernel mode can propose an exception be handled in debug mode by jumping to a special
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* location */
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if (__debug_frame->pc == (unsigned long) __break_hijack_kernel_event_breaks_here) {
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/* replace the debug frame with the kernel frame and discard
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* the top kernel context */
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*__debug_frame = *__frame;
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__frame = __debug_frame->next_frame;
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__debug_regs->brr = (__debug_frame->tbr & TBR_TT) << 12;
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__debug_regs->brr |= BRR_EB;
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}
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if (__debug_frame->pc == (unsigned long) __debug_bug_trap + 4) {
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__debug_frame->pc = __debug_frame->lr;
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type = __debug_frame->gr8;
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}
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#ifdef CONFIG_GDBSTUB
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gdbstub(type);
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#endif
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if (hsr0 & HSR0_ETMD)
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__set_HSR(0, __get_HSR(0) | HSR0_ETMD);
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} /* end debug_stub() */
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/*****************************************************************************/
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/*
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* debug stub initialisation
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*/
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static void __init debug_stub_init(void)
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{
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__set_IRR(6, 0xff000000); /* map ERRs to NMI */
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__set_IITMR(1, 0x20000000); /* ERR0/1, UART0/1 IRQ detect levels */
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asm volatile(" movgs gr0,ibar0 \n"
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" movgs gr0,ibar1 \n"
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" movgs gr0,ibar2 \n"
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" movgs gr0,ibar3 \n"
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" movgs gr0,dbar0 \n"
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" movgs gr0,dbmr00 \n"
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" movgs gr0,dbmr01 \n"
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" movgs gr0,dbdr00 \n"
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" movgs gr0,dbdr01 \n"
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" movgs gr0,dbar1 \n"
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" movgs gr0,dbmr10 \n"
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" movgs gr0,dbmr11 \n"
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" movgs gr0,dbdr10 \n"
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" movgs gr0,dbdr11 \n"
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);
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/* deal with debugging stub initialisation and initial pause */
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if (__debug_frame->pc == (unsigned long) __debug_stub_init_break)
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__debug_frame->pc = (unsigned long) start_kernel;
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/* enable the debug events we want to trap */
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__debug_regs->dcr = DCR_EBE;
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#ifdef CONFIG_GDBSTUB
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gdbstub_init();
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#endif
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__clr_MASK_all();
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__clr_MASK(15);
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__clr_RC(15);
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} /* end debug_stub_init() */
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/*****************************************************************************/
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/*
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* kernel "exit" trap for gdb stub
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*/
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void debug_stub_exit(int status)
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{
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#ifdef CONFIG_GDBSTUB
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gdbstub_exit(status);
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#endif
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} /* end debug_stub_exit() */
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/*****************************************************************************/
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/*
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* send string to serial port
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*/
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void debug_to_serial(const char *p, int n)
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{
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char ch;
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for (; n > 0; n--) {
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ch = *p++;
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FLOWCTL_SET0(DTR);
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LSR_WAIT_FOR0(THRE);
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// FLOWCTL_WAIT_FOR(CTS);
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if (ch == 0x0a) {
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__UART0(TX) = 0x0d;
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mb();
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LSR_WAIT_FOR0(THRE);
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// FLOWCTL_WAIT_FOR(CTS);
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}
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__UART0(TX) = ch;
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mb();
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FLOWCTL_CLEAR0(DTR);
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}
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} /* end debug_to_serial() */
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/*****************************************************************************/
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/*
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* send string to serial port
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*/
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void debug_to_serial2(const char *fmt, ...)
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{
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va_list va;
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char buf[64];
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int n;
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va_start(va, fmt);
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n = vsprintf(buf, fmt, va);
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va_end(va);
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debug_to_serial(buf, n);
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} /* end debug_to_serial2() */
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/*****************************************************************************/
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/*
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* set up the ttyS0 serial port baud rate timers
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*/
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void __init console_set_baud(unsigned baud)
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{
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unsigned value, high, low;
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u8 lcr;
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/* work out the divisor to give us the nearest higher baud rate */
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value = __serial_clock_speed_HZ / 16 / baud;
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/* determine the baud rate range */
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high = __serial_clock_speed_HZ / 16 / value;
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low = __serial_clock_speed_HZ / 16 / (value + 1);
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/* pick the nearest bound */
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if (low + (high - low) / 2 > baud)
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value++;
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lcr = __UART0(LCR);
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__UART0(LCR) |= UART_LCR_DLAB;
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mb();
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__UART0(DLL) = value & 0xff;
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__UART0(DLM) = (value >> 8) & 0xff;
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mb();
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__UART0(LCR) = lcr;
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mb();
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} /* end console_set_baud() */
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/*****************************************************************************/
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/*
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*
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*/
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int __init console_get_baud(void)
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{
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unsigned value;
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u8 lcr;
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lcr = __UART0(LCR);
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__UART0(LCR) |= UART_LCR_DLAB;
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mb();
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value = __UART0(DLM) << 8;
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value |= __UART0(DLL);
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__UART0(LCR) = lcr;
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mb();
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return value;
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} /* end console_get_baud() */
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/*****************************************************************************/
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/*
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* display BUG() info
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*/
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#ifndef CONFIG_NO_KERNEL_MSG
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void __debug_bug_printk(const char *file, unsigned line)
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{
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printk("kernel BUG at %s:%d!\n", file, line);
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} /* end __debug_bug_printk() */
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#endif
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