diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb5/i386/kvm-fbsd.c')
| -rw-r--r-- | gnu/usr.bin/binutils/gdb5/i386/kvm-fbsd.c | 995 |
1 files changed, 0 insertions, 995 deletions
diff --git a/gnu/usr.bin/binutils/gdb5/i386/kvm-fbsd.c b/gnu/usr.bin/binutils/gdb5/i386/kvm-fbsd.c deleted file mode 100644 index 9f2d69d..0000000 --- a/gnu/usr.bin/binutils/gdb5/i386/kvm-fbsd.c +++ /dev/null @@ -1,995 +0,0 @@ -/* Live and postmortem kernel debugging functions for FreeBSD. - Copyright 1996 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. */ - -/* $FreeBSD$ */ - -#include "defs.h" - -#include <errno.h> -#include <signal.h> -#include <fcntl.h> -#include <paths.h> -#include <sys/sysctl.h> -#include <sys/param.h> -#include <sys/time.h> -#include <sys/proc.h> -#include <sys/user.h> -#include "frame.h" /* required by inferior.h */ -#include "inferior.h" -#include "symtab.h" -#include "symfile.h" -#include "objfiles.h" -#include "command.h" -#include "bfd.h" -#include "target.h" -#include "gdbcore.h" -#include <sys/stat.h> -#include <unistd.h> -#include <vm/vm.h> -#include <vm/vm_param.h> - -#include <machine/vmparam.h> -#include <machine/pcb.h> -#include <machine/tss.h> -#include <machine/frame.h> -#include <machine/globaldata.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 kcore_xfer_kmem PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *)); - -static int xfer_umem PARAMS ((CORE_ADDR, char *, int, int)); - -static CORE_ADDR ksym_lookup PARAMS ((const char *)); - -static int read_pcb PARAMS ((int, CORE_ADDR)); - -static struct proc * curProc PARAMS ((void)); - -static int set_proc_context PARAMS ((CORE_ADDR paddr)); - -static void kcore_open PARAMS ((char *filename, int from_tty)); - -static void kcore_detach PARAMS ((char *args, int from_tty)); - -static void set_proc_cmd PARAMS ((char *arg, int from_tty)); - -static void set_cpu_cmd PARAMS ((char *arg, int from_tty)); - -static CORE_ADDR kvtophys PARAMS ((int, CORE_ADDR)); - -static int physrd PARAMS ((int, u_int, char*, int)); - -static int kvm_open PARAMS ((const char *efile, char *cfile, char *sfile, - int perm, char *errout)); - -static int kvm_close PARAMS ((int fd)); - -static int kvm_write PARAMS ((int core_kd, CORE_ADDR memaddr, - char *myaddr, int len)); - -static int kvm_read PARAMS ((int core_kd, CORE_ADDR memaddr, - char *myaddr, int len)); - -static int kvm_uread PARAMS ((int core_kd, struct proc *p, - CORE_ADDR memaddr, char *myaddr, - int len)); - -static int kernel_core_file_hook PARAMS ((int fd, CORE_ADDR addr, - char *buf, int len)); - -static CORE_ADDR kvm_getpcpu PARAMS ((int cfd, int cpuid)); - -static struct kinfo_proc * kvm_getprocs PARAMS ((int cfd, int op, - CORE_ADDR proc, int *cnt)); - -extern struct target_ops kcore_ops; /* Forward decl */ - -/* Non-zero means we are debugging a kernel core file */ -int kernel_debugging = 0; -int kernel_writablecore = 0; - -static char *core_file; -static int core_kd = -1; -static struct proc *cur_proc; -static CORE_ADDR kernel_start; - -static CORE_ADDR pcpu; -#define PCPU_OFFSET(name) \ - offsetof(struct globaldata, gd_ ## name) - -/* - * Symbol names of kernel entry points. Use special frames. - */ -#define KSYM_TRAP "calltrap" -#define KSYM_INTERRUPT "Xresume" -#define KSYM_SYSCALL "Xsyscall" - -/* - * 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)))) - - - -/* - * The following is FreeBSD-specific hackery to decode special frames - * and elide the assembly-language stub. This could be made faster by - * defining a frame_type field in the machine-dependent frame information, - * but we don't think that's too important right now. - */ -enum frametype { tf_normal, tf_trap, tf_interrupt, tf_syscall }; - -CORE_ADDR -fbsd_kern_frame_saved_pc (fr) -struct frame_info *fr; -{ - struct minimal_symbol *sym; - CORE_ADDR this_saved_pc; - enum frametype frametype; - - this_saved_pc = read_memory_integer (fr->frame + 4, 4); - sym = lookup_minimal_symbol_by_pc (this_saved_pc); - frametype = tf_normal; - if (sym != NULL) { - if (strcmp (SYMBOL_NAME(sym), KSYM_TRAP) == 0) - frametype = tf_trap; - else if (strncmp (SYMBOL_NAME(sym), KSYM_INTERRUPT, 7) == 0) - frametype = tf_interrupt; - else if (strcmp (SYMBOL_NAME(sym), KSYM_SYSCALL) == 0) - frametype = tf_syscall; - } - - switch (frametype) { - case tf_normal: - return (this_saved_pc); - -#define oEIP offsetof(struct trapframe, tf_eip) - - case tf_trap: - return (read_memory_integer (fr->frame + 8 + oEIP, 4)); - - case tf_interrupt: - return (read_memory_integer (fr->frame + 16 + oEIP, 4)); - - case tf_syscall: - return (read_memory_integer (fr->frame + 8 + oEIP, 4)); -#undef oEIP - } -} - -static 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); -} - -static struct proc * -curProc () -{ - struct proc *p; - CORE_ADDR addr = pcpu + PCPU_OFFSET (curproc); - - if (kvread (addr, &p)) - error ("cannot read proc pointer at %x\n", addr); - return p; -} - -/* - * Set the process context to that of the proc structure at - * system address paddr. - */ -static int -set_proc_context (paddr) - CORE_ADDR paddr; -{ - struct proc p; - - if (paddr < kernel_start) - return (1); - - cur_proc = (struct proc *)paddr; -#ifdef notyet - set_kernel_boundaries (cur_proc); -#endif - - /* 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 = -1; - } -} - -/* This routine opens and sets up the core file bfd */ - -static void -kcore_open (filename, from_tty) - char *filename; - int from_tty; -{ - const char *p; - struct cleanup *old_chain; - char buf[256], *cp; - int ontop; - CORE_ADDR addr; - struct pcb pcb; - - target_preopen (from_tty); - - unpush_target (&kcore_ops); - - if (!filename) - { - /*error (core_kd?*/ - error ( (core_kd >= 0)? - "No core file specified. (Use `detach' to stop debugging a core file.)" - : "No core file specified."); - } - - filename = tilde_expand (filename); - if (filename[0] != '/') - { - cp = concat (current_directory, "/", filename, NULL); - free (filename); - filename = cp; - } - - old_chain = make_cleanup (free, filename); - - /* - * gdb doesn't really do anything if the exec-file couldn't - * be opened (in that case exec_bfd is NULL). Usually that's - * no big deal, but kvm_open needs the exec-file's name, - * which results in dereferencing a NULL pointer, a real NO-NO ! - * So, check here if the open of the exec-file succeeded. - */ - if (exec_bfd == NULL) /* the open failed */ - error ("kgdb could not open the exec-file, please check the name you used !"); - - core_kd = kvm_open (exec_bfd->filename, filename, NULL, - kernel_writablecore? O_RDWR : O_RDONLY, "kgdb: "); - if (core_kd < 0) - perror_with_name (filename); - - /* 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; - ontop = !push_target (&kcore_ops); - - kernel_start = bfd_get_start_address (exec_bfd); /* XXX */ - - /* 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 ("panicstr: %s\n", buf); - } - - /* Print all the panic messages if possible. */ - if (symfile_objfile != NULL) - { - printf ("panic messages:\n---\n"); - snprintf (buf, sizeof buf, - "/sbin/dmesg -N %s -M %s | \ - /usr/bin/awk '/^(panic:|Fatal trap) / { printing = 1 } \ - { if (printing) print $0 }'", - symfile_objfile->name, filename); - fflush(stdout); - system (buf); - printf ("---\n"); - } - - 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; - } - - /* we may need this later */ - cur_proc = (struct proc *)curProc (); - /* 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); - 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; -{ - struct user *uaddr; - - /* find the pcb for the current process */ - if (cur_proc == NULL || kvread (&cur_proc->p_addr, &uaddr)) - error ("cannot read u area ptr for proc at %#x", cur_proc); - if (read_pcb (core_kd, (CORE_ADDR)&uaddr->u_pcb) < 0) - error ("cannot read pcb at %#x", &uaddr->u_pcb); -} - -static void -kcore_files_info (t) - struct target_ops *t; -{ - printf ("\t`%s'\n", core_file); -} - -static int -kcore_xfer_kmem (memaddr, myaddr, len, write, target) - CORE_ADDR memaddr; - char *myaddr; - int len; - int write; - struct target_ops *target; -{ - int ns; - int nu; - - if (memaddr >= (CORE_ADDR)VM_MAXUSER_ADDRESS) - nu = 0; - else - { - nu = xfer_umem (memaddr, myaddr, len, write); - if (nu <= 0) - return (0); - if (nu == len) - return (nu); - memaddr += nu; - if (memaddr != (CORE_ADDR)VM_MAXUSER_ADDRESS) - return (nu); - myaddr += nu; - len -= nu; - } - - ns = (write ? kvm_write : kvm_read) (core_kd, memaddr, myaddr, len); - if (ns < 0) - ns = 0; - - return (nu + ns); -} - -static int -xfer_umem (memaddr, myaddr, len, write) - CORE_ADDR memaddr; - char *myaddr; - int len; - int write; /* ignored */ -{ - int n; - struct proc proc; - - if (cur_proc == NULL || 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; -} - -#define KERNOFF ((unsigned)KERNBASE) -#define INKERNEL(x) ((x) >= KERNOFF) - -static CORE_ADDR sbr; -static CORE_ADDR curpcb; -static int found_pcb; -static int devmem; -static int kfd; -static struct pcb pcb; - -static void -set_proc_cmd (arg, from_tty) - char *arg; - int from_tty; -{ - CORE_ADDR paddr; - struct kinfo_proc *kp; - int cnt = 0; - - if (!arg) - error_no_arg ("proc address for new current process"); - if (!kernel_debugging) - error ("not debugging kernel"); - - paddr = (CORE_ADDR)parse_and_eval_address (arg); - /* assume it's a proc pointer if it's in the kernel */ - if (paddr >= kernel_start) { - if (set_proc_context(paddr)) - error("invalid proc address"); - } else { - kp = kvm_getprocs(core_kd, KERN_PROC_PID, paddr, &cnt); - if (!cnt) - error("invalid pid"); - if (set_proc_context((CORE_ADDR)kp->ki_paddr)) - error("invalid proc address"); - } -} - -static void -set_cpu_cmd (arg, from_tty) - char *arg; - int from_tty; -{ - CORE_ADDR paddr; - CORE_ADDR pcaddr; - struct kinfo_proc *kp; - int cpu, cfd; - - if (!arg) - error_no_arg ("cpu number"); - if (!kernel_debugging) - error ("not debugging kernel"); - - cfd = core_kd; - cpu = (int)parse_and_eval_address (arg); - if ((pcaddr = kvm_getpcpu (cfd, cpu)) == NULL) - error ("cpu number out of range"); - - pcpu = pcaddr; - curpcb = kvtophys(cfd, pcpu + PCPU_OFFSET (curpcb)); - physrd (cfd, curpcb, (char*)&curpcb, sizeof curpcb); - - if (!devmem) - paddr = ksym_lookup ("dumppcb") - KERNOFF; - else - paddr = kvtophys (cfd, curpcb); - read_pcb (cfd, paddr); - printf ("initial pcb at %lx\n", (unsigned long)paddr); - - if ((cur_proc = curProc())) - 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); - print_stack_frame (selected_frame, selected_frame_level, 1); -} - -/* substitutes for the stuff in libkvm which doesn't work */ -/* most of this was taken from the old kgdb */ - -/* we don't need all this stuff, but the call should look the same */ - -static int -kvm_open (efile, cfile, sfile, perm, errout) - const char *efile; - char *cfile; - char *sfile; /* makes this kvm_open more compatible to the one in libkvm */ - int perm; - char *errout; /* makes this kvm_open more compatible to the one in libkvm */ -{ - struct stat stb; - int cfd; - CORE_ADDR paddr; - - if ((cfd = open (cfile, perm, 0)) < 0) - return (cfd); - - if ((pcpu = kvm_getpcpu (cfd, 0)) == NULL) - return (-1); - - fstat (cfd, &stb); - if ((stb.st_mode & S_IFMT) == S_IFCHR - && stb.st_rdev == makedev (2, 0)) - { - devmem = 1; - kfd = open (_PATH_KMEM, perm, 0); - } - - physrd (cfd, ksym_lookup ("IdlePTD") - KERNOFF, (char*)&sbr, sizeof sbr); - printf ("IdlePTD %lu\n", (unsigned long)sbr); - curpcb = kvtophys(cfd, pcpu + PCPU_OFFSET (curpcb)); - physrd (cfd, curpcb, (char*)&curpcb, sizeof curpcb); - - found_pcb = 1; /* for vtophys */ - if (!devmem) - paddr = ksym_lookup ("dumppcb") - KERNOFF; - else - paddr = kvtophys (cfd, curpcb); - read_pcb (cfd, paddr); - printf ("initial pcb at %lx\n", (unsigned long)paddr); - - return (cfd); -} - -static int -kvm_close (fd) - int fd; -{ - return (close (fd)); -} - -static int -kvm_write (core_kd, memaddr, myaddr, len) - int core_kd; - CORE_ADDR memaddr; - char *myaddr; -{ - int cc; - - if (devmem) - { - if (kfd > 0) - { - /* - * Just like kvm_read, only we write. - */ - errno = 0; - if (lseek (kfd, (off_t)memaddr, 0) < 0 - && errno != 0) - { - error ("kvm_write:invalid address (%x)", memaddr); - return (0); - } - cc = write (kfd, myaddr, len); - if (cc < 0) - { - error ("kvm_write:write failed"); - return (0); - } - else if (cc < len) - error ("kvm_write:short write"); - return (cc); - } - else - return (0); - } - else - { - printf ("kvm_write not implemented for dead kernels\n"); - return (0); - } - /* NOTREACHED */ -} - -static int -kvm_read (core_kd, memaddr, myaddr, len) - int core_kd; - CORE_ADDR memaddr; - char *myaddr; -{ - return (kernel_core_file_hook (core_kd, memaddr, myaddr, len)); -} - -static int -kvm_uread (core_kd, p, memaddr, myaddr, len) - int core_kd; - register struct proc *p; - CORE_ADDR memaddr; - char *myaddr; - int len; -{ - register char *cp; - char procfile[MAXPATHLEN]; - ssize_t amount; - int fd; - - if (devmem) - { - sprintf (procfile, "/proc/%d/mem", p->p_pid); - fd = open (procfile, O_RDONLY, 0); - if (fd < 0) - { - error ("cannot open %s", procfile); - close (fd); - return (0); - } - - cp = myaddr; - while (len > 0) - { - errno = 0; - if (lseek (fd, (off_t)memaddr, 0) == -1 && errno != 0) - { - error ("invalid address (%x) in %s", memaddr, procfile); - break; - } - amount = read (fd, cp, len); - if (amount < 0) - { - error ("error reading %s", procfile); - break; - } - if (amount == 0) - { - error ("EOF reading %s", procfile); - break; - } - cp += amount; - memaddr += amount; - len -= amount; - } - - close (fd); - return ((ssize_t) (cp - myaddr)); - } - else - return (kernel_core_file_hook (core_kd, memaddr, myaddr, len)); -} - -static struct kinfo_proc kp; - -/* - * try to do what kvm_proclist in libkvm would do - */ -static int -kvm_proclist (cfd, pid, p, cnt) -int cfd, pid, *cnt; -struct proc *p; -{ - struct proc lp; - - for (; p != NULL; p = LIST_NEXT(&lp, p_list)) { - if (!kvm_read(cfd, (CORE_ADDR)p, (char *)&lp, sizeof (lp))) - return (0); - if (lp.p_pid != pid) - continue; - kp.ki_paddr = p; - *cnt = 1; - return (1); - } - *cnt = 0; - return (0); -} - -/* - * try to do what kvm_deadprocs in libkvm would do - */ -static struct kinfo_proc * -kvm_deadprocs (cfd, pid, cnt) -int cfd, pid, *cnt; -{ - CORE_ADDR allproc, zombproc; - struct proc *p; - - allproc = ksym_lookup("allproc"); - if (kvm_read(cfd, allproc, (char *)&p, sizeof (p)) == 0) - return (NULL); - kvm_proclist (cfd, pid, p, cnt); - if (!*cnt) { - zombproc = ksym_lookup("zombproc"); - if (kvm_read(cfd, zombproc, (char *)&p, sizeof (p)) == 0) - return (NULL); - kvm_proclist (cfd, pid, p, cnt); - } - return (&kp); -} - -static CORE_ADDR -kvm_getpcpu (cfd, cpuid) -int cfd, cpuid; -{ - SLIST_HEAD(, globaldata) pcpu_head; - struct globaldata lgd; - struct globaldata *gd; - - physrd (cfd, ksym_lookup ("cpuhead") - KERNOFF, (char*)&pcpu_head, - sizeof pcpu_head); - gd = SLIST_FIRST (&pcpu_head); - for (; gd != NULL; gd = SLIST_NEXT (&lgd, gd_allcpu)) - { - kvm_read (cfd, (CORE_ADDR)gd, (char*)&lgd, sizeof lgd); - if (lgd.gd_cpuid == cpuid) - break; - } - - return ((CORE_ADDR)gd); -} - -/* - * try to do what kvm_getprocs in libkvm would do - */ -static struct kinfo_proc * -kvm_getprocs (cfd, op, proc, cnt) -int cfd, op, *cnt; -CORE_ADDR proc; -{ - int mib[4], size; - - *cnt = 0; - /* assume it's a pid */ - if (devmem) { /* "live" kernel, use sysctl */ - mib[0] = CTL_KERN; - mib[1] = KERN_PROC; - mib[2] = KERN_PROC_PID; - mib[3] = (int)proc; - size = sizeof (kp); - if (sysctl (mib, 4, &kp, &size, NULL, 0) < 0) { - perror("sysctl"); - *cnt = 0; - return (NULL); - } - if (!size) - *cnt = 0; - else - *cnt = 1; - return (&kp); - } else - return (kvm_deadprocs (cfd, (int)proc, cnt)); -} - -static int -physrd (cfd, addr, dat, len) - int cfd; - u_int addr; - char *dat; - int len; -{ - if (lseek (cfd, (off_t)addr, L_SET) == -1) - return (-1); - return (read (cfd, dat, len)); -} - -static CORE_ADDR -kvtophys (fd, addr) - int fd; - CORE_ADDR addr; -{ - CORE_ADDR v; - unsigned int pte; - static CORE_ADDR PTD = -1; - CORE_ADDR current_ptd; - - /* - * We may no longer have a linear system page table... - * - * Here's the scoop. IdlePTD contains the physical address - * of a page table directory that always maps the kernel. - * IdlePTD is in memory that is mapped 1-to-1, so we can - * find it easily given its 'virtual' address from ksym_lookup(). - * For hysterical reasons, the value of IdlePTD is stored in sbr. - * - * To look up a kernel address, we first convert it to a 1st-level - * address and look it up in IdlePTD. This gives us the physical - * address of a page table page; we extract the 2nd-level part of - * VA and read the 2nd-level pte. Finally, we add the offset part - * of the VA into the physical address from the pte and return it. - * - * User addresses are a little more complicated. If we don't have - * a current PCB from read_pcb(), we use PTD, which is the (fixed) - * virtual address of the current ptd. Since it's NOT in 1-to-1 - * kernel space, we must look it up using IdlePTD. If we do have - * a pcb, we get the ptd from pcb_ptd. - */ - - if (INKERNEL (addr)) - current_ptd = sbr; - else if (found_pcb == 0) - { - if (PTD == -1) - PTD = kvtophys (fd, ksym_lookup ("PTD")); - current_ptd = PTD; - } - else - current_ptd = pcb.pcb_cr3; - - /* - * Read the first-level page table (ptd). - */ - v = current_ptd + ( (unsigned)addr >> PDRSHIFT) * sizeof pte; - if (physrd (fd, v, (char *)&pte, sizeof pte) < 0 || (pte&PG_V) == 0) - return (~0); - - if (pte & PG_PS) - { - /* - * No second-level page table; ptd describes one 4MB page. - * (We assume that the kernel wouldn't set PG_PS without enabling - * it cr0, and that the kernel doesn't support 36-bit physical - * addresses). - */ -#define PAGE4M_MASK (NBPDR - 1) -#define PG_FRAME4M (~PAGE4M_MASK) - addr = (pte & PG_FRAME4M) + (addr & PAGE4M_MASK); - } - else - { - /* - * Read the second-level page table. - */ - v = (pte&PG_FRAME) + ((addr >> PAGE_SHIFT)&(NPTEPG-1)) * sizeof pte; - if (physrd (fd, v, (char *) &pte, sizeof (pte)) < 0 || (pte&PG_V) == 0) - return (~0); - - addr = (pte & PG_FRAME) + (addr & PAGE_MASK); - } -#if 0 - printf ("vtophys (%x) -> %x\n", oldaddr, addr); -#endif - return (addr); -} - -static int -read_pcb (fd, uaddr) - int fd; - CORE_ADDR uaddr; -{ - int i; - int noreg; - CORE_ADDR nuaddr = uaddr; - - /* need this for the `proc' command to work */ - if (INKERNEL(uaddr)) - nuaddr = kvtophys(fd, uaddr); - - if (physrd (fd, nuaddr, (char *)&pcb, sizeof pcb) < 0) - { - error ("cannot read pcb at %x\n", uaddr); - return (-1); - } - - /* - * get the register values out of the sys pcb and - * store them where `read_register' will find them. - */ - /* - * XXX many registers aren't available. - * XXX for the non-core case, the registers are stale - they are for - * the last context switch to the debugger. - * XXX gcc's register numbers aren't all #defined in tm-i386.h. - */ - noreg = 0; - for (i = 0; i < 3; ++i) /* eax,ecx,edx */ - supply_register (i, (char *)&noreg); - supply_register (3, (char *)&pcb.pcb_ebx); - supply_register (SP_REGNUM, (char *)&pcb.pcb_esp); - supply_register (FP_REGNUM, (char *)&pcb.pcb_ebp); - supply_register (6, (char *)&pcb.pcb_esi); - supply_register (7, (char *)&pcb.pcb_edi); - supply_register (PC_REGNUM, (char *)&pcb.pcb_eip); - for (i = 9; i < 14; ++i) /* eflags, cs, ss, ds, es, fs */ - supply_register (i, (char *)&noreg); - supply_register (15, (char *)&pcb.pcb_gs); - - /* XXX 80387 registers? */ -} - -/* - * read len bytes from kernel virtual address 'addr' into local - * buffer 'buf'. Return numbert of bytes if read ok, 0 otherwise. On read - * errors, portion of buffer not read is zeroed. - */ - -static int -kernel_core_file_hook (fd, addr, buf, len) - int fd; - CORE_ADDR addr; - char *buf; - int len; -{ - int i; - CORE_ADDR paddr; - register char *cp; - int cc; - - cp = buf; - - while (len > 0) - { - paddr = kvtophys (fd, addr); - if (paddr == ~0) - { - memset (buf, '\000', len); - break; - } - /* we can't read across a page boundary */ - i = min (len, PAGE_SIZE - (addr & PAGE_MASK)); - if ( (cc = physrd (fd, paddr, cp, i)) <= 0) - { - memset (cp, '\000', len); - return (cp - buf); - } - cp += cc; - addr += cc; - len -= cc; - } - return (cp - buf); -} - -static struct target_ops kcore_ops; - -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 = kcore_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"); - add_com ("cpu", class_obscure, set_cpu_cmd, "Set current cpu"); -} |
