2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
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5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
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12 * the documentation and/or other materials provided with the
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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33 * Mach Operating System
34 * Copyright (c) 1991,1990 Carnegie Mellon University
35 * All Rights Reserved.
37 * Permission to use, copy, modify and distribute this software and its
38 * documentation is hereby granted, provided that both the copyright
39 * notice and this permission notice appear in all copies of the
40 * software, derivative works or modified versions, and any portions
41 * thereof, and that both notices appear in supporting documentation.
43 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
44 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
45 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
47 * Carnegie Mellon requests users of this software to return to
49 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
50 * School of Computer Science
51 * Carnegie Mellon University
52 * Pittsburgh PA 15213-3890
54 * any improvements or extensions that they make and grant Carnegie the
55 * rights to redistribute these changes.
57 * $FreeBSD: src/sys/i386/i386/db_interface.c,v 1.48.2.1 2000/07/07 00:38:46 obrien Exp $
58 * $DragonFly: src/sys/platform/pc64/amd64/db_interface.c,v 1.3 2008/08/29 17:07:10 dillon Exp $
62 * Interface to new debugger.
64 #include <sys/param.h>
65 #include <sys/systm.h>
66 #include <sys/reboot.h>
68 #include <sys/thread.h>
70 #include <machine/cpu.h>
71 #include <machine/smp.h>
72 #include <machine/globaldata.h>
73 #include <machine/md_var.h>
80 #include <sys/thread2.h>
84 static jmp_buf *db_nofault = 0;
85 extern jmp_buf db_jmpbuf;
87 extern void gdb_handle_exception (db_regs_t *, int, int);
92 static jmp_buf db_global_jmpbuf;
93 static int db_global_jmpbuf_valid;
96 #define rss() ({u_short ss; __asm __volatile("mov %%ss,%0" : "=r" (ss)); ss;})
100 * kdb_trap - field a TRACE or BPT trap
103 kdb_trap(int type, int code, struct amd64_saved_state *regs)
105 volatile int ddb_mode = !(boothowto & RB_GDB);
108 * XXX try to do nothing if the console is in graphics mode.
109 * Handle trace traps (and hardware breakpoints...) by ignoring
110 * them except for forgetting about them. Return 0 for other
111 * traps to say that we haven't done anything. The trap handler
112 * will usually panic. We should handle breakpoint traps for
113 * our breakpoints by disarming our breakpoints and fixing up
116 if (cons_unavail && ddb_mode) {
117 if (type == T_TRCTRAP) {
118 regs->tf_rflags &= ~PSL_T;
125 case T_BPTFLT: /* breakpoint */
126 case T_TRCTRAP: /* debug exception */
131 * XXX this is almost useless now. In most cases,
132 * trap_fatal() has already printed a much more verbose
133 * message. However, it is dangerous to print things in
134 * trap_fatal() - kprintf() might be reentered and trap.
135 * The debugger should be given control first.
138 db_printf("kernel: type %d trap, code=%x\n", type, code);
141 jmp_buf *no_fault = db_nofault;
143 longjmp(*no_fault, 1);
148 * This handles unexpected traps in ddb commands, including calls to
149 * non-ddb functions. db_nofault only applies to memory accesses by
150 * internal ddb commands.
152 if (db_global_jmpbuf_valid)
153 longjmp(db_global_jmpbuf, 1);
156 * XXX We really should switch to a local stack here.
162 db_printf("\nCPU%d stopping CPUs: 0x%08x\n",
163 mycpu->gd_cpuid, mycpu->gd_other_cpus);
165 /* We stop all CPUs except ourselves (obviously) */
166 stop_cpus(mycpu->gd_other_cpus);
168 db_printf(" stopped\n");
171 setjmp(db_global_jmpbuf);
172 db_global_jmpbuf_valid = TRUE;
174 /* vcons_set_mode(1); */
180 gdb_handle_exception(&ddb_regs, type, code);
182 /* vcons_set_mode(0); */
183 db_global_jmpbuf_valid = FALSE;
186 db_printf("\nCPU%d restarting CPUs: 0x%08x\n",
187 mycpu->gd_cpuid, stopped_cpus);
189 /* Restart all the CPUs we previously stopped */
190 if (stopped_cpus != mycpu->gd_other_cpus) {
191 db_printf("whoa, other_cpus: 0x%08x, stopped_cpus: 0x%08x\n",
192 mycpu->gd_other_cpus, stopped_cpus);
193 panic("stop_cpus() failed");
195 restart_cpus(stopped_cpus);
197 db_printf(" restarted\n");
201 regs->tf_rip = ddb_regs.tf_rip;
202 regs->tf_rflags = ddb_regs.tf_rflags;
203 regs->tf_rax = ddb_regs.tf_rax;
204 regs->tf_rcx = ddb_regs.tf_rcx;
205 regs->tf_rdx = ddb_regs.tf_rdx;
206 regs->tf_rbx = ddb_regs.tf_rbx;
208 regs->tf_rsp = ddb_regs.tf_rsp;
209 regs->tf_ss = ddb_regs.tf_ss & 0xffff;
211 regs->tf_rbp = ddb_regs.tf_rbp;
212 regs->tf_rsi = ddb_regs.tf_rsi;
213 regs->tf_rdi = ddb_regs.tf_rdi;
215 regs->tf_r8 = ddb_regs.tf_r8;
216 regs->tf_r9 = ddb_regs.tf_r9;
217 regs->tf_r10 = ddb_regs.tf_r10;
218 regs->tf_r11 = ddb_regs.tf_r11;
219 regs->tf_r12 = ddb_regs.tf_r12;
220 regs->tf_r13 = ddb_regs.tf_r13;
221 regs->tf_r14 = ddb_regs.tf_r14;
222 regs->tf_r15 = ddb_regs.tf_r15;
224 /* regs->tf_es = ddb_regs.tf_es & 0xffff; */
225 /* regs->tf_fs = ddb_regs.tf_fs & 0xffff; */
226 /* regs->tf_gs = ddb_regs.tf_gs & 0xffff; */
227 regs->tf_cs = ddb_regs.tf_cs & 0xffff;
228 /* regs->tf_ds = ddb_regs.tf_ds & 0xffff; */
233 * Read bytes from kernel address space for debugger.
236 db_read_bytes(vm_offset_t addr, size_t size, char *data)
240 db_nofault = &db_jmpbuf;
250 * Write bytes to kernel address space for debugger.
253 db_write_bytes(vm_offset_t addr, size_t size, char *data)
257 vpte_t *ptep0 = NULL;
260 vpte_t *ptep1 = NULL;
264 db_nofault = &db_jmpbuf;
266 if (addr > trunc_page((vm_offset_t)btext) - size &&
267 addr < round_page((vm_offset_t)etext)) {
269 ptep0 = pmap_kpte(addr);
273 /* Map another page if the data crosses a page boundary. */
274 if ((*ptep0 & PG_PS) == 0) {
275 addr1 = trunc_page(addr + size - 1);
276 if (trunc_page(addr) != addr1) {
277 ptep1 = pmap_kpte(addr1);
282 addr1 = trunc_4mpage(addr + size - 1);
283 if (trunc_4mpage(addr) != addr1) {
284 ptep1 = pmap_kpte(addr1);
314 * The debugger sometimes needs to know the actual KVM address represented
315 * by the instruction pointer, stack pointer, or base pointer. Normally
316 * the actual KVM address is simply the contents of the register. However,
317 * if the debugger is entered from the BIOS or VM86 we need to figure out
318 * the offset from the segment register.
321 PC_REGS(db_regs_t *regs)
323 return(regs->tf_rip);
327 SP_REGS(db_regs_t *regs)
329 return(regs->tf_rsp);
333 BP_REGS(db_regs_t *regs)
335 return(regs->tf_rbp);
340 * Move this to machdep.c and allow it to be called if any debugger is
344 Debugger(const char *msg)
346 static volatile u_char in_Debugger;
350 * Do nothing if the console is in graphics mode. This is
351 * OK if the call is for the debugger hotkey but not if the call
352 * is a weak form of panicing.
354 if (cons_unavail && !(boothowto & RB_GDB))
359 db_printf("Debugger(\"%s\")\n", msg);