diff options
author | gallatin <gallatin@FreeBSD.org> | 1999-06-21 15:00:15 +0000 |
---|---|---|
committer | gallatin <gallatin@FreeBSD.org> | 1999-06-21 15:00:15 +0000 |
commit | 8055b17e857c6c26d1b2e5424eae88fe9b25c031 (patch) | |
tree | 82175b6f94b5d9f3b419f37660df47c76c22e13b /gnu | |
parent | f31af56e7f778f4838e1223e36c75c45b5795ebd (diff) | |
download | FreeBSD-src-8055b17e857c6c26d1b2e5424eae88fe9b25c031.zip FreeBSD-src-8055b17e857c6c26d1b2e5424eae88fe9b25c031.tar.gz |
Live & postmortem kernel debugging support for the alpha platform.
This was modeled after NetBSD's kernel debugging support.
Reviewed by: Doug Rabson <dfr@nlsystems.com>
Diffstat (limited to 'gnu')
-rw-r--r-- | gnu/usr.bin/binutils/gdb/Makefile.alpha | 5 | ||||
-rw-r--r-- | gnu/usr.bin/binutils/gdb/alpha/freebsd-nat.c | 27 | ||||
-rw-r--r-- | gnu/usr.bin/binutils/gdb/alpha/kvm-fbsd.c | 435 | ||||
-rw-r--r-- | gnu/usr.bin/binutils/gdb/alpha/nm.h | 23 | ||||
-rw-r--r-- | gnu/usr.bin/binutils/gdb/alpha/tm.h | 4 |
5 files changed, 492 insertions, 2 deletions
diff --git a/gnu/usr.bin/binutils/gdb/Makefile.alpha b/gnu/usr.bin/binutils/gdb/Makefile.alpha index 54a09ee..dc46c3a 100644 --- a/gnu/usr.bin/binutils/gdb/Makefile.alpha +++ b/gnu/usr.bin/binutils/gdb/Makefile.alpha @@ -1,7 +1,8 @@ # -# $Id$ +# $Id: Makefile.alpha,v 1.1 1999/05/02 11:31:55 dfr Exp $ # -XSRCS+= freebsd-nat.c alpha-tdep.c +XSRCS+= freebsd-nat.c alpha-tdep.c kvm-fbsd.c +LDADD+= -lkvm .PATH: ${.CURDIR}/alpha diff --git a/gnu/usr.bin/binutils/gdb/alpha/freebsd-nat.c b/gnu/usr.bin/binutils/gdb/alpha/freebsd-nat.c index 1bc8790..0cc1792 100644 --- a/gnu/usr.bin/binutils/gdb/alpha/freebsd-nat.c +++ b/gnu/usr.bin/binutils/gdb/alpha/freebsd-nat.c @@ -144,3 +144,30 @@ supply_fpregset (fp) supply_register (regno + 32, (char *)&fp->fpr_regs[regno]); } #endif /* HAVE_FPREGSET_T */ + +/* + * Get registers from a kernel crash dump or live kernel. + * Called by kvm-fbsd.c:get_kcore_registers(). + */ +fetch_kcore_registers (pcbp) + struct pcb *pcbp; +{ + + /* First clear out any garbage. */ + memset(registers, '\0', REGISTER_BYTES); + + /* SP */ + *(long *) ®isters[REGISTER_BYTE (SP_REGNUM)] = + pcbp->pcb_hw.apcb_ksp; + + /* S0 through S6 */ + memcpy (®isters[REGISTER_BYTE (S0_REGNUM)], + &pcbp->pcb_context[0], 7 * sizeof(long)); + + /* PC */ + *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)] = + pcbp->pcb_context[7]; + + registers_fetched (); +} + diff --git a/gnu/usr.bin/binutils/gdb/alpha/kvm-fbsd.c b/gnu/usr.bin/binutils/gdb/alpha/kvm-fbsd.c new file mode 100644 index 0000000..5c28908 --- /dev/null +++ b/gnu/usr.bin/binutils/gdb/alpha/kvm-fbsd.c @@ -0,0 +1,435 @@ +/* Kernel core dump functions below target vector, for GDB. + Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995 + Free Software Foundation, Inc. + +This file is part of GDB. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +/* + * This works like "remote" but, you use it like this: + * target kcore /dev/mem + * or + * target kcore /var/crash/host/core.0 + * + * This way makes it easy to short-circut the whole bfd monster, + * and direct the inferior stuff to our libkvm implementation. + */ + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/proc.h> +#include <sys/user.h> +#include <errno.h> +#include <signal.h> +#include <fcntl.h> +#include <kvm.h> + +#include "defs.h" +#include "gdb_string.h" +#include "frame.h" /* required by inferior.h */ +#include "inferior.h" +#include "symtab.h" +#include "command.h" +#include "bfd.h" +#include "target.h" +#include "gdbcore.h" + +static void +kcore_files_info PARAMS ((struct target_ops *)); + +static void +kcore_close PARAMS ((int)); + +static void +get_kcore_registers PARAMS ((int)); + +static int +xfer_mem PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *)); + +static int +xfer_umem PARAMS ((CORE_ADDR, char *, int, int)); + +static char *core_file; +static kvm_t *core_kd; +static struct pcb cur_pcb; + +static struct target_ops kcore_ops; +int kernel_writablecore; + +/* + * Read the "thing" at kernel address 'addr' into the space pointed to + * by point. The length of the "thing" is determined by the type of p. + * Result is non-zero if transfer fails. + */ +#define kvread(addr, p) \ +(target_read_memory((CORE_ADDR)(addr), (char *)(p), sizeof(*(p)))) + + +CORE_ADDR +ksym_lookup(name) + const char *name; +{ + struct minimal_symbol *sym; + + sym = lookup_minimal_symbol(name, NULL, NULL); + if (sym == NULL) + error("kernel symbol `%s' not found.", name); + + return SYMBOL_VALUE_ADDRESS(sym); +} + +/* + * Provide the address of an initial PCB to use. + * If this is a crash dump, try for "dumppcb". + * If no "dumppcb" or it's /dev/mem, use proc0. + * Return the core address of the PCB we found. + */ +static CORE_ADDR +initial_pcb() +{ + struct minimal_symbol *sym; + CORE_ADDR addr; + void *val; + + /* Make sure things are open... */ + if (!core_kd || !core_file) + return (0); + + /* If this is NOT /dev/mem try for dumppcb. */ + if (strncmp(core_file, "/dev/", 5)) { + sym = lookup_minimal_symbol("dumppcb", NULL, NULL); + if (sym != NULL) { + addr = SYMBOL_VALUE_ADDRESS(sym); + return (addr); + } + } + + /* + * OK, just use proc0pcb. Note that curproc might + * not exist, and if it does, it will point to gdb. + * Therefore, just use proc0 and let the user set + * some other context if they care about it. + */ + addr = ksym_lookup("proc0paddr"); + if (kvread(addr, &val)) { + error("cannot read proc0paddr pointer at %x\n", addr); + val = 0; + } + + return ((CORE_ADDR)val); +} + +/* + * Set the current context to that of the PCB struct + * at the system address passed. + */ +static int +set_context(addr) + CORE_ADDR addr; +{ + + if (kvread(addr, &cur_pcb)) + error("cannot read pcb at %#x", addr); + + /* Fetch all registers from core file */ + target_fetch_registers (-1); + + /* Now, set up the frame cache, and print the top of stack */ + flush_cached_frames(); + set_current_frame (create_new_frame (read_fp (), read_pc ())); + select_frame (get_current_frame (), 0); + return (0); +} + +/* Discard all vestiges of any previous core file and mark data and stack + spaces as empty. */ + +/* ARGSUSED */ +static void +kcore_close (quitting) + int quitting; +{ + + inferior_pid = 0; /* Avoid confusion from thread stuff */ + + if (core_kd) { + kvm_close(core_kd); + free(core_file); + core_file = NULL; + core_kd = NULL; + } +} + +/* This routine opens and sets up the core file bfd. */ + +static void +kcore_open (filename, from_tty) + char *filename; /* the core file */ + int from_tty; +{ + kvm_t *kd; + const char *p; + struct cleanup *old_chain; + char buf[256], *cp; + int ontop; + CORE_ADDR addr; + + target_preopen (from_tty); + + /* The exec file is required for symbols. */ + if (exec_bfd == NULL) + error("No kernel exec file specified"); + + if (core_kd) { + error ("No core file specified." + " (Use `detach' to stop debugging a core file.)"); + return; + } + + if (!filename) { + error ("No core file specified."); + return; + } + + filename = tilde_expand (filename); + if (filename[0] != '/') { + cp = concat (current_directory, "/", filename, NULL); + free (filename); + filename = cp; + } + + old_chain = make_cleanup (free, filename); + + kd = kvm_open (bfd_get_filename(exec_bfd), filename, NULL, + kernel_writablecore ? O_RDWR: O_RDONLY, 0); + if (kd == NULL) { + perror_with_name (filename); + return; + } + + /* Looks semi-reasonable. Toss the old core file and work on the new. */ + + discard_cleanups (old_chain); /* Don't free filename any more */ + core_file = filename; + unpush_target (&kcore_ops); + ontop = !push_target (&kcore_ops); + + /* Note unpush_target (above) calls kcore_close. */ + core_kd = kd; + + /* print out the panic string if there is one */ + if (kvread(ksym_lookup("panicstr"), &addr) == 0 && + addr != 0 && + target_read_memory(addr, buf, sizeof(buf)) == 0) { + + for (cp = buf; cp < &buf[sizeof(buf)] && *cp; cp++) + if (!isascii(*cp) || (!isprint(*cp) && !isspace(*cp))) + *cp = '?'; + *cp = '\0'; + if (buf[0] != '\0') + printf_filtered("panic: %s\n", buf); + } + + if (!ontop) { + warning ( +"you won't be able to access this core file until you terminate\n\ +your %s; do ``info files''", target_longname); + return; + } + + /* Now, set up process context, and print the top of stack */ + (void)set_context(initial_pcb()); + print_stack_frame (selected_frame, selected_frame_level, 1); +} + +static void +kcore_detach (args, from_tty) + char *args; + int from_tty; +{ + if (args) + error ("Too many arguments"); + unpush_target (&kcore_ops); + reinit_frame_cache (); + if (from_tty) + printf_filtered ("No kernel core file now.\n"); +} + +/* Get the registers out of a core file. This is the machine- + independent part. Fetch_core_registers is the machine-dependent + part, typically implemented in the xm-file for each architecture. */ + +/* We just get all the registers, so we don't use regno. */ + +/* ARGSUSED */ +static void +get_kcore_registers (regno) + int regno; +{ + + /* + * XXX - Only read the pcb when set_context() is called. + * When looking at a live kernel this may be a problem, + * but the user can do another "proc" or "pcb" command to + * grab a new copy of the pcb... + */ + + /* + * Zero out register set then fill in the ones we know about. + */ + fetch_kcore_registers (&cur_pcb); +} + +static void +kcore_files_info (t) + struct target_ops *t; +{ + printf_filtered ("\t`%s'\n", core_file); +} + +/* If mourn is being called in all the right places, this could be say + `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */ + +static int +ignore (addr, contents) + CORE_ADDR addr; + char *contents; +{ + return 0; +} + +static int +xfer_kmem (memaddr, myaddr, len, write, target) + CORE_ADDR memaddr; + char *myaddr; + int len; + int write; + struct target_ops *target; +{ + int n; + +#if 0 /* XXX */ + if (it is a user address) + return xfer_umem(memaddr, myaddr, len, write); +#endif + + if (core_kd == NULL) + return 0; + + if (write) + n = kvm_write(core_kd, memaddr, myaddr, len); + else + n = kvm_read (core_kd, memaddr, myaddr, len) ; + if (n < 0) { + fprintf_unfiltered (gdb_stderr, "can not access 0x%x, %s\n", + memaddr, kvm_geterr(core_kd)); + n = 0; + } + + return n; +} + +#if 0 /* XXX */ +static int +xfer_umem (memaddr, myaddr, len, write) + CORE_ADDR memaddr; + char *myaddr; + int len; + int write; /* ignored */ +{ + int n; + struct proc proc; + + if (kvread(cur_proc, &proc)) + error("cannot read proc at %#x", cur_proc); + n = kvm_uread(core_kd, &proc, memaddr, myaddr, len) ; + + if (n < 0) + return 0; + return n; +} +#endif + +static void +set_proc_cmd(arg) + char *arg; +{ + CORE_ADDR addr; + void *val; + + if (!arg) + error_no_arg("proc address for the new context"); + + if (core_kd == NULL) + error("no kernel core file"); + + addr = (CORE_ADDR)parse_and_eval_address(arg); + + /* Read the PCB address in proc structure. */ + addr += (int) &((struct proc *)0)->p_addr; + if (kvread(addr, &val)) + error("cannot read u area ptr"); + + if (set_context((CORE_ADDR)val)) + error("invalid proc address"); +} + +static void +set_pcb_cmd(arg) + char *arg; +{ + CORE_ADDR addr; + void *val; + + if (!arg) + error_no_arg("pcb address for the new context"); + + if (core_kd == NULL) + error("no kernel core file"); + + addr = (CORE_ADDR)parse_and_eval_address(arg); + + if (set_context(addr)) + error("invalid pcb address"); +} + + + +void +_initialize_kcorelow() +{ + kcore_ops.to_shortname = "kcore"; + kcore_ops.to_longname = "Kernel core dump file"; + kcore_ops.to_doc = + "Use a core file as a target. Specify the filename of the core file."; + kcore_ops.to_open = kcore_open; + kcore_ops.to_close = kcore_close; + kcore_ops.to_attach = find_default_attach; + kcore_ops.to_detach = kcore_detach; + kcore_ops.to_fetch_registers = get_kcore_registers; + kcore_ops.to_xfer_memory = xfer_kmem; + kcore_ops.to_files_info = kcore_files_info; + kcore_ops.to_create_inferior = find_default_create_inferior; + kcore_ops.to_stratum = kcore_stratum; + kcore_ops.to_has_memory = 1; + kcore_ops.to_has_stack = 1; + kcore_ops.to_has_registers = 1; + kcore_ops.to_magic = OPS_MAGIC; + + add_target (&kcore_ops); + add_com ("proc", class_obscure, set_proc_cmd, "Set current process context"); +} diff --git a/gnu/usr.bin/binutils/gdb/alpha/nm.h b/gnu/usr.bin/binutils/gdb/alpha/nm.h index b5a8b65..5aaa8a2 100644 --- a/gnu/usr.bin/binutils/gdb/alpha/nm.h +++ b/gnu/usr.bin/binutils/gdb/alpha/nm.h @@ -69,3 +69,26 @@ extern CORE_ADDR alpha_u_regs_offset(); extern int kernel_debugging; extern int kernel_writablecore; + +#define ADDITIONAL_OPTIONS \ + {"kernel", no_argument, &kernel_debugging, 1}, \ + {"k", no_argument, &kernel_debugging, 1}, \ + {"wcore", no_argument, &kernel_writablecore, 1}, \ + {"w", no_argument, &kernel_writablecore, 1}, + +#define ADDITIONAL_OPTION_HELP \ + "\ + --kernel Enable kernel debugging.\n\ + --wcore Make core file writable (only works for /dev/mem).\n\ + This option only works while debugging a kernel !!\n\ +" + +#define DEFAULT_PROMPT kernel_debugging?"(kgdb) ":"(gdb) " + +/* misuse START_PROGRESS to test whether we're running as kgdb */ +/* START_PROGRESS is called at the top of main */ +#undef START_PROGRESS +#define START_PROGRESS(STR,N) \ + if (!strcmp(STR, "kgdb")) \ + kernel_debugging = 1; + diff --git a/gnu/usr.bin/binutils/gdb/alpha/tm.h b/gnu/usr.bin/binutils/gdb/alpha/tm.h index a0667a5..5d48664 100644 --- a/gnu/usr.bin/binutils/gdb/alpha/tm.h +++ b/gnu/usr.bin/binutils/gdb/alpha/tm.h @@ -22,6 +22,10 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #define TM_FREEBSDALPHA_H #include "alpha/tm-alpha.h" +#ifndef S0_REGNUM +#define S0_REGNUM (T7_REGNUM+1) +#endif + /* Number of traps that happen between exec'ing the shell to run an inferior, and when we finally get to the inferior code. This is 2 |