f540b1065a
``changes'' are actually not changes at all, but CVS sometimes has trouble telling the difference. This also includes support for second-directory compiles. This is not quite complete yet, as `config' doesn't yet do the right thing. You can still make it work trivially, however, by doing the following: rm /sys/compile mkdir /usr/obj/sys/compile ln -s M-. /sys/compile cd /sys/i386/conf config MYKERNEL cd ../../compile/MYKERNEL ln -s /sys @ rm machine ln -s @/i386/include machine make depend make
241 lines
4.9 KiB
C
241 lines
4.9 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: db_interface.c,v 1.7 1994/05/25 08:53:13 rgrimes Exp $
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*/
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/*
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* Interface to new debugger.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <ddb/ddb.h>
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#include <sys/reboot.h>
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/* #include <vm/vm_statistics.h> */
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#include <vm/pmap.h>
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#include <setjmp.h>
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int db_active = 0;
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db_regs_t ddb_regs;
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/*
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* Received keyboard interrupt sequence.
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*/
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void
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kdb_kbd_trap(regs)
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struct i386_saved_state *regs;
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{
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if (db_active == 0 && (boothowto & RB_KDB)) {
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printf("\n\nkernel: keyboard interrupt\n");
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kdb_trap(-1, 0, regs);
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}
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}
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/*
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* kdb_trap - field a TRACE or BPT trap
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*/
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static jmp_buf *db_nofault = 0;
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int
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kdb_trap(type, code, regs)
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int type, code;
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register struct i386_saved_state *regs;
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{
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#if 0
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if ((boothowto&RB_KDB) == 0)
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return(0);
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#endif
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switch (type) {
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case T_BPTFLT /* T_INT3 */: /* breakpoint */
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case T_KDBTRAP /* T_WATCHPOINT */: /* watchpoint */
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case T_PRIVINFLT /* T_DEBUG */: /* single_step */
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case -1: /* keyboard interrupt */
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break;
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default:
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kdbprinttrap(type, code);
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if (db_nofault) {
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jmp_buf *no_fault = db_nofault;
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db_nofault = 0;
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longjmp(*no_fault, 1);
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}
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}
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/* Should switch to kdb`s own stack here. */
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ddb_regs = *regs;
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if ((regs->tf_cs & 0x3) == 0) {
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/*
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* Kernel mode - esp and ss not saved
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*/
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ddb_regs.tf_esp = (int)®s->tf_esp; /* kernel stack pointer */
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#if 0
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ddb_regs.ss = KERNEL_DS;
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#endif
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asm(" movw %%ss,%%ax; movl %%eax,%0 "
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: "=g" (ddb_regs.tf_ss)
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:
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: "ax");
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}
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db_active++;
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cnpollc(TRUE);
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db_trap(type, code);
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cnpollc(FALSE);
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db_active--;
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regs->tf_eip = ddb_regs.tf_eip;
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regs->tf_eflags = ddb_regs.tf_eflags;
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regs->tf_eax = ddb_regs.tf_eax;
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regs->tf_ecx = ddb_regs.tf_ecx;
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regs->tf_edx = ddb_regs.tf_edx;
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regs->tf_ebx = ddb_regs.tf_ebx;
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if (regs->tf_cs & 0x3) {
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/*
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* user mode - saved esp and ss valid
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*/
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regs->tf_esp = ddb_regs.tf_esp; /* user stack pointer */
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regs->tf_ss = ddb_regs.tf_ss & 0xffff; /* user stack segment */
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}
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regs->tf_ebp = ddb_regs.tf_ebp;
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regs->tf_esi = ddb_regs.tf_esi;
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regs->tf_edi = ddb_regs.tf_edi;
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regs->tf_es = ddb_regs.tf_es & 0xffff;
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regs->tf_cs = ddb_regs.tf_cs & 0xffff;
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regs->tf_ds = ddb_regs.tf_ds & 0xffff;
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#if 0
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regs->tf_fs = ddb_regs.tf_fs & 0xffff;
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regs->tf_gs = ddb_regs.tf_gs & 0xffff;
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#endif
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return (1);
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}
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/*
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* Print trap reason.
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*/
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void
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kdbprinttrap(type, code)
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int type, code;
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{
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printf("kernel: ");
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printf("type %d", type);
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printf(" trap, code=%x\n", code);
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}
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/*
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* Read bytes from kernel address space for debugger.
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*/
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extern jmp_buf db_jmpbuf;
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void
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db_read_bytes(addr, size, data)
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vm_offset_t addr;
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register int size;
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register char *data;
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{
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register char *src;
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db_nofault = &db_jmpbuf;
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src = (char *)addr;
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while (--size >= 0)
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*data++ = *src++;
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db_nofault = 0;
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}
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/*
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* Write bytes to kernel address space for debugger.
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*/
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void
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db_write_bytes(addr, size, data)
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vm_offset_t addr;
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register int size;
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register char *data;
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{
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register char *dst;
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register pt_entry_t *ptep0 = 0;
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pt_entry_t oldmap0 = { 0 };
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vm_offset_t addr1;
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register pt_entry_t *ptep1 = 0;
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pt_entry_t oldmap1 = { 0 };
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extern char etext;
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db_nofault = &db_jmpbuf;
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if (addr >= VM_MIN_KERNEL_ADDRESS &&
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addr <= (vm_offset_t)&etext)
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{
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ptep0 = pmap_pte(kernel_pmap, addr);
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oldmap0 = *ptep0;
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*(int *)ptep0 |= /* INTEL_PTE_WRITE */ PG_RW;
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addr1 = i386_trunc_page(addr + size - 1);
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if (i386_trunc_page(addr) != addr1) {
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/* data crosses a page boundary */
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ptep1 = pmap_pte(kernel_pmap, addr1);
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oldmap1 = *ptep1;
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*(int *)ptep1 |= /* INTEL_PTE_WRITE */ PG_RW;
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}
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tlbflush();
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}
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dst = (char *)addr;
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while (--size >= 0)
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*dst++ = *data++;
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db_nofault = 0;
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if (ptep0) {
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*ptep0 = oldmap0;
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if (ptep1) {
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*ptep1 = oldmap1;
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}
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tlbflush();
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}
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}
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void
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Debugger (msg)
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const char *msg;
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{
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asm ("int $3");
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}
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