+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+/*
+ * HISTORY
+ * $Log: db_trace.c,v $
+ * Revision 1.1 1992/03/25 21:42:05 pace
+ * Initial revision
+ *
+ * Revision 2.6 91/02/05 17:11:21 mrt
+ * Changed to new Mach copyright
+ * [91/02/01 17:31:32 mrt]
+ *
+ * Revision 2.5 91/01/09 19:55:27 rpd
+ * Fixed stack tracing for threads without kernel stacks.
+ * [91/01/09 rpd]
+ *
+ * Revision 2.4 91/01/08 15:10:22 rpd
+ * Reorganized the pcb.
+ * [90/12/11 rpd]
+ *
+ * Revision 2.3 90/11/05 14:27:07 rpd
+ * If we can not guess the number of args to a function, use 5 vs 0.
+ * [90/11/02 rvb]
+ *
+ * Revision 2.2 90/08/27 21:56:20 dbg
+ * Import db_sym.h.
+ * [90/08/21 dbg]
+ * Fix includes.
+ * [90/08/08 dbg]
+ * Created from rvb's code for new debugger.
+ * [90/07/11 dbg]
+ *
+ */
+#include "param.h"
+#include "proc.h"
+#include <machine/db_machdep.h>
+
+#include <ddb/db_access.h>
+#include <ddb/db_sym.h>
+#include <ddb/db_variables.h>
+
+/*
+ * Machine register set.
+ */
+struct db_variable db_regs[] = {
+ "cs", (int *)&ddb_regs.tf_cs, FCN_NULL,
+ "ds", (int *)&ddb_regs.tf_ds, FCN_NULL,
+ "es", (int *)&ddb_regs.tf_es, FCN_NULL,
+#if 0
+ "fs", (int *)&ddb_regs.tf_fs, FCN_NULL,
+ "gs", (int *)&ddb_regs.tf_gs, FCN_NULL,
+#endif
+ "ss", (int *)&ddb_regs.tf_ss, FCN_NULL,
+ "eax", (int *)&ddb_regs.tf_eax, FCN_NULL,
+ "ecx", (int *)&ddb_regs.tf_ecx, FCN_NULL,
+ "edx", (int *)&ddb_regs.tf_edx, FCN_NULL,
+ "ebx", (int *)&ddb_regs.tf_ebx, FCN_NULL,
+ "esp", (int *)&ddb_regs.tf_esp,FCN_NULL,
+ "ebp", (int *)&ddb_regs.tf_ebp, FCN_NULL,
+ "esi", (int *)&ddb_regs.tf_esi, FCN_NULL,
+ "edi", (int *)&ddb_regs.tf_edi, FCN_NULL,
+ "eip", (int *)&ddb_regs.tf_eip, FCN_NULL,
+ "efl", (int *)&ddb_regs.tf_eflags, FCN_NULL,
+};
+struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
+
+/*
+ * Stack trace.
+ */
+#define INKERNEL(va) (((vm_offset_t)(va)) >= VM_MIN_KERNEL_ADDRESS)
+
+struct i386_frame {
+ struct i386_frame *f_frame;
+ int f_retaddr;
+ int f_arg0;
+};
+
+#define TRAP 1
+#define INTERRUPT 2
+
+db_addr_t db_trap_symbol_value = 0;
+db_addr_t db_kdintr_symbol_value = 0;
+boolean_t db_trace_symbols_found = FALSE;
+
+void
+db_find_trace_symbols()
+{
+ db_expr_t value;
+ if (db_value_of_name("_trap", &value))
+ db_trap_symbol_value = (db_addr_t) value;
+ if (db_value_of_name("_kdintr", &value))
+ db_kdintr_symbol_value = (db_addr_t) value;
+ db_trace_symbols_found = TRUE;
+}
+
+/*
+ * Figure out how many arguments were passed into the frame at "fp".
+ */
+int
+db_numargs(fp)
+ struct i386_frame *fp;
+{
+ int *argp;
+ int inst;
+ int args;
+ extern char etext[];
+
+ argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE);
+ if (argp < (int *)VM_MIN_KERNEL_ADDRESS || argp > (int *)etext)
+ args = 5;
+ else {
+ inst = db_get_value((int)argp, 4, FALSE);
+ if ((inst & 0xff) == 0x59) /* popl %ecx */
+ args = 1;
+ else if ((inst & 0xffff) == 0xc483) /* addl %n, %esp */
+ args = ((inst >> 16) & 0xff) / 4;
+ else
+ args = 5;
+ }
+ return (args);
+}
+
+/*
+ * Figure out the next frame up in the call stack.
+ * For trap(), we print the address of the faulting instruction and
+ * proceed with the calling frame. We return the ip that faulted.
+ * If the trap was caused by jumping through a bogus pointer, then
+ * the next line in the backtrace will list some random function as
+ * being called. It should get the argument list correct, though.
+ * It might be possible to dig out from the next frame up the name
+ * of the function that faulted, but that could get hairy.
+ */
+void
+db_nextframe(fp, ip, argp, is_trap)
+ struct i386_frame **fp; /* in/out */
+ db_addr_t *ip; /* out */
+ int *argp; /* in */
+ int is_trap; /* in */
+{
+ struct i386_saved_state *saved_regs;
+
+ if (is_trap == 0) {
+ *ip = (db_addr_t)
+ db_get_value((int) &(*fp)->f_retaddr, 4, FALSE);
+ *fp = (struct i386_frame *)
+ db_get_value((int) &(*fp)->f_frame, 4, FALSE);
+ } else {
+ /*
+ * We know that trap() has 1 argument and we know that
+ * it is an (int *).
+ */
+ saved_regs = (struct i386_saved_state *)
+ db_get_value((int)argp, 4, FALSE);
+ db_printf("--- trap (number %d) ---\n",
+ saved_regs->tf_trapno & 0xffff);
+ db_printsym(saved_regs->tf_eip, DB_STGY_XTRN);
+ db_printf(":\n");
+ *fp = (struct i386_frame *)saved_regs->tf_ebp;
+ *ip = (db_addr_t)saved_regs->tf_eip;
+ }
+
+}
+
+void
+db_stack_trace_cmd(addr, have_addr, count, modif)
+ db_expr_t addr;
+ boolean_t have_addr;
+ db_expr_t count;
+ char *modif;
+{
+ struct i386_frame *frame, *lastframe;
+ int *argp;
+ db_addr_t callpc;
+ int is_trap;
+ boolean_t kernel_only = TRUE;
+ boolean_t trace_thread = FALSE;
+
+ if (!db_trace_symbols_found)
+ db_find_trace_symbols();
+
+ {
+ register char *cp = modif;
+ register char c;
+
+ while ((c = *cp++) != 0) {
+ if (c == 't')
+ trace_thread = TRUE;
+ if (c == 'u')
+ kernel_only = FALSE;
+ }
+ }
+
+ if (count == -1)
+ count = 65535;
+
+ if (!have_addr) {
+ frame = (struct i386_frame *)ddb_regs.tf_ebp;
+ callpc = (db_addr_t)ddb_regs.tf_eip;
+ }
+ else if (trace_thread) {
+ printf ("db_trace.c: can't trace thread\n");
+ }
+ else {
+ frame = (struct i386_frame *)addr;
+ callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE);
+ }
+
+ lastframe = 0;
+ while (count-- && frame != 0) {
+ register int narg;
+ char * name;
+ db_expr_t offset;
+
+ if (INKERNEL((int)frame) && callpc == db_trap_symbol_value) {
+ narg = 1;
+ is_trap = TRAP;
+ }
+ else
+ if (INKERNEL((int)frame) && callpc == db_kdintr_symbol_value) {
+ is_trap = INTERRUPT;
+ narg = 0;
+ }
+ else {
+ is_trap = 0;
+ narg = db_numargs(frame);
+ }
+
+ db_find_sym_and_offset(callpc, &name, &offset);
+ db_printf("%s(", name);
+
+ argp = &frame->f_arg0;
+ while (narg) {
+ db_printf("%x", db_get_value((int)argp, 4, FALSE));
+ argp++;
+ if (--narg != 0)
+ db_printf(",");
+ }
+ db_printf(") at ");
+ db_printsym(callpc, DB_STGY_XTRN);
+ db_printf("\n");
+
+ lastframe = frame;
+ db_nextframe(&frame, &callpc, &frame->f_arg0, is_trap);
+
+ if (frame == 0) {
+ /* end of chain */
+ break;
+ }
+ if (INKERNEL((int)frame)) {
+ /* staying in kernel */
+ if (frame <= lastframe) {
+ db_printf("Bad frame pointer: 0x%x\n", frame);
+ break;
+ }
+ }
+ else if (INKERNEL((int)lastframe)) {
+ /* switch from user to kernel */
+ if (kernel_only)
+ break; /* kernel stack only */
+ }
+ else {
+ /* in user */
+ if (frame <= lastframe) {
+ db_printf("Bad frame pointer: 0x%x\n", frame);
+ break;
+ }
+ }
+ }
+}
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