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33 * Mach Operating System
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57 * $FreeBSD: src/sys/i386/i386/db_interface.c,v 1.48.2.1 2000/07/07 00:38:46 obrien Exp $
61 * Interface to new debugger.
63 #include <sys/param.h>
64 #include <sys/systm.h>
65 #include <sys/reboot.h>
67 #include <sys/thread.h>
69 #include <machine/cpu.h>
70 #include <machine/smp.h>
71 #include <machine/globaldata.h>
72 #include <machine/md_var.h>
79 #include <sys/thread2.h>
83 static jmp_buf *db_nofault = 0;
84 extern jmp_buf db_jmpbuf;
86 extern void gdb_handle_exception (db_regs_t *, int, int);
91 static jmp_buf db_global_jmpbuf;
92 static int db_global_jmpbuf_valid;
95 #define rss() ({u_short ss; __asm __volatile("mov %%ss,%0" : "=r" (ss)); ss;})
99 * kdb_trap - field a TRACE or BPT trap
102 kdb_trap(int type, int code, struct x86_64_saved_state *regs)
104 volatile int ddb_mode = !(boothowto & RB_GDB);
107 * XXX try to do nothing if the console is in graphics mode.
108 * Handle trace traps (and hardware breakpoints...) by ignoring
109 * them except for forgetting about them. Return 0 for other
110 * traps to say that we haven't done anything. The trap handler
111 * will usually panic. We should handle breakpoint traps for
112 * our breakpoints by disarming our breakpoints and fixing up
115 if (cons_unavail && ddb_mode) {
116 if (type == T_TRCTRAP) {
117 regs->tf_rflags &= ~PSL_T;
124 case T_BPTFLT: /* breakpoint */
125 case T_TRCTRAP: /* debug exception */
130 * XXX this is almost useless now. In most cases,
131 * trap_fatal() has already printed a much more verbose
132 * message. However, it is dangerous to print things in
133 * trap_fatal() - kprintf() might be reentered and trap.
134 * The debugger should be given control first.
137 db_printf("kernel: type %d trap, code=%x\n", type, code);
140 jmp_buf *no_fault = db_nofault;
142 longjmp(*no_fault, 1);
147 * This handles unexpected traps in ddb commands, including calls to
148 * non-ddb functions. db_nofault only applies to memory accesses by
149 * internal ddb commands.
151 if (db_global_jmpbuf_valid)
152 longjmp(db_global_jmpbuf, 1);
155 * XXX We really should switch to a local stack here.
161 db_printf("\nCPU%d stopping CPUs: 0x%08x\n",
162 mycpu->gd_cpuid, mycpu->gd_other_cpus);
164 /* We stop all CPUs except ourselves (obviously) */
165 stop_cpus(mycpu->gd_other_cpus);
167 db_printf(" stopped\n");
170 setjmp(db_global_jmpbuf);
171 db_global_jmpbuf_valid = TRUE;
173 /* vcons_set_mode(1); */
179 gdb_handle_exception(&ddb_regs, type, code);
181 /* vcons_set_mode(0); */
182 db_global_jmpbuf_valid = FALSE;
185 db_printf("\nCPU%d restarting CPUs: 0x%08x\n",
186 mycpu->gd_cpuid, stopped_cpus);
188 /* Restart all the CPUs we previously stopped */
189 if (stopped_cpus != mycpu->gd_other_cpus) {
190 db_printf("whoa, other_cpus: 0x%08x, stopped_cpus: 0x%08x\n",
191 mycpu->gd_other_cpus, stopped_cpus);
192 panic("stop_cpus() failed");
194 restart_cpus(stopped_cpus);
196 db_printf(" restarted\n");
200 regs->tf_rip = ddb_regs.tf_rip;
201 regs->tf_rflags = ddb_regs.tf_rflags;
202 regs->tf_rax = ddb_regs.tf_rax;
203 regs->tf_rcx = ddb_regs.tf_rcx;
204 regs->tf_rdx = ddb_regs.tf_rdx;
205 regs->tf_rbx = ddb_regs.tf_rbx;
207 regs->tf_rsp = ddb_regs.tf_rsp;
208 regs->tf_ss = ddb_regs.tf_ss & 0xffff;
210 regs->tf_rbp = ddb_regs.tf_rbp;
211 regs->tf_rsi = ddb_regs.tf_rsi;
212 regs->tf_rdi = ddb_regs.tf_rdi;
214 regs->tf_r8 = ddb_regs.tf_r8;
215 regs->tf_r9 = ddb_regs.tf_r9;
216 regs->tf_r10 = ddb_regs.tf_r10;
217 regs->tf_r11 = ddb_regs.tf_r11;
218 regs->tf_r12 = ddb_regs.tf_r12;
219 regs->tf_r13 = ddb_regs.tf_r13;
220 regs->tf_r14 = ddb_regs.tf_r14;
221 regs->tf_r15 = ddb_regs.tf_r15;
223 /* regs->tf_es = ddb_regs.tf_es & 0xffff; */
224 /* regs->tf_fs = ddb_regs.tf_fs & 0xffff; */
225 /* regs->tf_gs = ddb_regs.tf_gs & 0xffff; */
226 regs->tf_cs = ddb_regs.tf_cs & 0xffff;
227 /* regs->tf_ds = ddb_regs.tf_ds & 0xffff; */
232 * Read bytes from kernel address space for debugger.
235 db_read_bytes(vm_offset_t addr, size_t size, char *data)
239 db_nofault = &db_jmpbuf;
249 * Write bytes to kernel address space for debugger.
252 db_write_bytes(vm_offset_t addr, size_t size, char *data)
256 vpte_t *ptep0 = NULL;
259 vpte_t *ptep1 = NULL;
263 db_nofault = &db_jmpbuf;
265 if (addr > trunc_page((vm_offset_t)btext) - size &&
266 addr < round_page((vm_offset_t)etext)) {
268 ptep0 = pmap_kpte(addr);
272 /* Map another page if the data crosses a page boundary. */
273 if ((*ptep0 & PG_PS) == 0) {
274 addr1 = trunc_page(addr + size - 1);
275 if (trunc_page(addr) != addr1) {
276 ptep1 = pmap_kpte(addr1);
281 addr1 = trunc_4mpage(addr + size - 1);
282 if (trunc_4mpage(addr) != addr1) {
283 ptep1 = pmap_kpte(addr1);
313 * The debugger sometimes needs to know the actual KVM address represented
314 * by the instruction pointer, stack pointer, or base pointer. Normally
315 * the actual KVM address is simply the contents of the register. However,
316 * if the debugger is entered from the BIOS or VM86 we need to figure out
317 * the offset from the segment register.
320 PC_REGS(db_regs_t *regs)
322 return(regs->tf_rip);
326 SP_REGS(db_regs_t *regs)
328 return(regs->tf_rsp);
332 BP_REGS(db_regs_t *regs)
334 return(regs->tf_rbp);
339 * Move this to machdep.c and allow it to be called if any debugger is
343 Debugger(const char *msg)
345 static volatile u_char in_Debugger;
349 * Do nothing if the console is in graphics mode. This is
350 * OK if the call is for the debugger hotkey but not if the call
351 * is a weak form of panicing.
353 if (cons_unavail && !(boothowto & RB_GDB))
358 db_printf("Debugger(\"%s\")\n", msg);