From d760a3490fc1b670b97637f7331c337e02402555 Mon Sep 17 00:00:00 2001 From: obrien Date: Wed, 10 Jul 2002 06:58:25 +0000 Subject: Stop trying to reimplement libkvm on i386. Instead use it directly and consistently on all platforms. Submitted by: gallatin --- gnu/usr.bin/binutils/gdb/kvm-fbsd.c | 1246 ++++++++++++----------------------- 1 file changed, 422 insertions(+), 824 deletions(-) (limited to 'gnu/usr.bin') diff --git a/gnu/usr.bin/binutils/gdb/kvm-fbsd.c b/gnu/usr.bin/binutils/gdb/kvm-fbsd.c index e9250ed..14f557b 100644 --- a/gnu/usr.bin/binutils/gdb/kvm-fbsd.c +++ b/gnu/usr.bin/binutils/gdb/kvm-fbsd.c @@ -1,5 +1,6 @@ -/* Live and postmortem kernel debugging functions for FreeBSD. - Copyright 1996 Free Software Foundation, Inc. +/* 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. @@ -15,22 +16,36 @@ 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. */ +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ /* $FreeBSD$ */ -#include "defs.h" +/* + * 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 -#include -#include -#include -#include -#include #include #include #include #include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "defs.h" +#include "gdb_string.h" #include "frame.h" /* required by inferior.h */ #include "inferior.h" #include "symtab.h" @@ -40,333 +55,263 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "target.h" #include "gdbcore.h" -#include -#include -#include -#include - -#include -#include -#ifdef __i386__ -#include -#endif -#include - -#define _KERNEL -#include -#undef _KERNEL - -#include - -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 mem_attrib *attrib, 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 void +kcore_files_info PARAMS ((struct target_ops *)); -static int kvm_read PARAMS ((int core_kd, CORE_ADDR memaddr, - char *myaddr, int len)); +static void +kcore_close PARAMS ((int)); -static int kvm_uread PARAMS ((int core_kd, struct proc *p, - CORE_ADDR memaddr, char *myaddr, - int len)); +static void +get_kcore_registers PARAMS ((int)); -static int kernel_core_file_hook PARAMS ((int fd, CORE_ADDR addr, - char *buf, int len)); +static int +xfer_mem PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *)); -static CORE_ADDR kvm_getpcpu PARAMS ((int cfd, int cpuid)); +static int +xfer_umem PARAMS ((CORE_ADDR, char *, int, int)); -static struct kinfo_proc * kvm_getprocs PARAMS ((int cfd, int op, - CORE_ADDR proc, int *cnt)); +static char *core_file; +static kvm_t *core_kd; +static struct pcb cur_pcb; +static struct kinfo_proc *cur_proc; -extern struct target_ops kcore_ops; /* Forward decl */ +static struct target_ops kcore_ops; -/* Non-zero means we are debugging a kernel core file */ int kernel_debugging; int kernel_writablecore; -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 pcpu, pc_ ## name) - -/* - * Symbol names of kernel entry points. Use special frames. - */ -#define KSYM_TRAP "calltrap" -#define KSYM_INTR "Xintr" -#define KSYM_FASTINTR "Xfastintr" -#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)))) +(target_read_memory((CORE_ADDR)(addr), (char *)(p), sizeof(*(p)))) + +static CORE_ADDR +ksym_kernbase() +{ + static CORE_ADDR kernbase; + struct minimal_symbol *sym; + if (kernbase == 0) + { + sym = lookup_minimal_symbol ("kernbase", NULL, NULL); + if (sym == NULL) { + kernbase = KERNBASE; + } else { + kernbase = SYMBOL_VALUE_ADDRESS (sym); + } + } + return kernbase; +} +#define KERNOFF (ksym_kernbase()) +#define INKERNEL(x) ((x) >= KERNOFF) -/* - * 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; +ksym_lookup(name) + const char *name; { - 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_INTR, - strlen(KSYM_INTR)) == 0 || strncmp (SYMBOL_NAME(sym), - KSYM_FASTINTR, strlen(KSYM_FASTINTR)) == 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); -#ifdef __i386__ -#define oEIP offsetof(struct trapframe, tf_eip) - - case tf_trap: - return (read_memory_integer (fr->frame + 8 + oEIP, 4)); + struct minimal_symbol *sym; - case tf_interrupt: - return (read_memory_integer (fr->frame + 12 + oEIP, 4)); + sym = lookup_minimal_symbol(name, NULL, NULL); + if (sym == NULL) + error("kernel symbol `%s' not found.", name); - case tf_syscall: - return (read_memory_integer (fr->frame + 8 + oEIP, 4)); -#undef oEIP -#endif - } + 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 -ksym_lookup (name) -const char *name; +initial_pcb() { - struct minimal_symbol *sym; + 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, _PATH_DEV, sizeof _PATH_DEV - 1)) { + sym = lookup_minimal_symbol("dumppcb", NULL, NULL); + if (sym != NULL) { + addr = SYMBOL_VALUE_ADDRESS(sym); + return (addr); + } + } - sym = lookup_minimal_symbol (name, NULL, NULL); - if (sym == NULL) - error ("kernel symbol `%s' not found.", name); + /* + * OK, just use thread0's pcb. 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("thread0"); + if (kvread(addr, &val)) { + error("cannot read thread0 pointer at %x\n", addr); + val = 0; + } else { + /* Read the PCB address in thread structure. */ + addr += offsetof(struct thread, td_pcb); + if (kvread(addr, &val)) { + error("cannot read thread0->td_pcb pointer at %x\n", addr); + val = 0; + } + } - return SYMBOL_VALUE_ADDRESS (sym); -} + cur_proc = 0; /* thread0 is wholly in the kernel and cur_proc is + * only used for reading user mem, so no point + * in setting this up */ + -static struct proc * -curProc () -{ - struct proc *p; - struct thread *td; - CORE_ADDR addr = pcpu + PCPU_OFFSET (curthread); - - if (kvread (addr, &td)) - error ("cannot read thread pointer at %x\n", addr); - addr = (CORE_ADDR)td + offsetof(struct thread, td_proc); - if (kvread (addr, &p)) - error ("cannot read proc pointer at %x\n", addr); - return p; + return ((CORE_ADDR)val); } /* - * Set the process context to that of the proc structure at - * system address paddr. + * Set the current context to that of the PCB struct + * at the system address passed. */ static int -set_proc_context (paddr) - CORE_ADDR paddr; +set_context(addr) + CORE_ADDR addr; { - struct proc p; + CORE_ADDR procaddr = 0; - if (paddr < kernel_start) - return (1); - - cur_proc = (struct proc *)paddr; -#ifdef notyet - set_kernel_boundaries (cur_proc); -#endif + 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 (); + 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. */ +/* 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_ptid = null_ptid; /* Avoid confusion from thread stuff */ - if (core_kd) - { - kvm_close (core_kd); - free (core_file); - core_file = NULL; - core_kd = -1; - } + 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 */ +/* This routine opens and sets up the core file bfd. */ static void kcore_open (filename, from_tty) - char *filename; + 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; - struct pcb pcb; target_preopen (from_tty); - unpush_target (&kcore_ops); + /* The exec file is required for symbols. */ + if (exec_bfd == NULL) + error("No kernel exec file specified"); - 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."); - } + 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; - } + 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) + 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. */ + /* Looks semi-reasonable. Toss the old core file and work on the new. */ - discard_cleanups (old_chain); /* Don't free filename any more */ + discard_cleanups (old_chain); /* Don't free filename any more */ core_file = filename; + unpush_target (&kcore_ops); ontop = !push_target (&kcore_ops); - kernel_start = bfd_get_start_address (exec_bfd); /* XXX */ + /* 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 ("panicstr: %s\n", buf); - } + 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); + } /* 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); + "/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\ + 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; - } + 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); + /* 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); } @@ -383,37 +328,68 @@ kcore_detach (args, 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. */ +#ifdef __alpha__ -/* We just get all the registers, so we don't use regno. */ -/* ARGSUSED */ -static void -get_kcore_registers (regno) - int regno; +#include "alpha/tm-alpha.h" +#ifndef S0_REGNUM +#define S0_REGNUM (T7_REGNUM+1) +#endif + + +fetch_kcore_registers (pcbp) + struct pcb *pcbp; { - struct pcb *pcbaddr; - struct thread *mainthread; - - /* find the pcb for the current process */ - if (cur_proc == NULL) - error ("get_kcore_registers no proc"); - if (kvread (&TAILQ_FIRST(&cur_proc->p_threads), &mainthread)) /* XXXKSE */ - error ("cannot read main thread for proc at %#x", cur_proc); - if (kvread (&mainthread->td_pcb, &pcbaddr)) /* XXXKSE */ - error ("cannot read pcb pointer for proc at %#x", cur_proc); - if (read_pcb (core_kd, (CORE_ADDR)pcbaddr) < 0) - error ("cannot read pcb at %#x", pcbaddr); + + /* 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 (); } -static void -kcore_files_info (t) - struct target_ops *t; + +CORE_ADDR +fbsd_kern_frame_saved_pc (fi) +struct frame_info *fi; { - printf ("\t`%s'\n", core_file); + struct minimal_symbol *sym; + CORE_ADDR this_saved_pc; + + this_saved_pc = alpha_frame_saved_pc (fi); + + sym = lookup_minimal_symbol_by_pc (this_saved_pc); + + if (sym != NULL && + (strcmp (SYMBOL_NAME(sym), "XentArith") == 0 || + strcmp (SYMBOL_NAME(sym), "XentIF") == 0 || + strcmp (SYMBOL_NAME(sym), "XentInt") == 0 || + strcmp (SYMBOL_NAME(sym), "XentMM") == 0 || + strcmp (SYMBOL_NAME(sym), "XentSys") == 0 || + strcmp (SYMBOL_NAME(sym), "XentUna") == 0 || + strcmp (SYMBOL_NAME(sym), "XentRestart") == 0)) { + return (read_memory_integer (fi->frame + 32 * 8, 8)); + } else { + return (this_saved_pc); + } } +#endif /* __alpha__ */ + +#ifdef __i386__ + + + static CORE_ADDR ksym_maxuseraddr() { @@ -432,627 +408,250 @@ ksym_maxuseraddr() return maxuseraddr; } -static int -kcore_xfer_kmem (memaddr, myaddr, len, write, attrib, target) - CORE_ADDR memaddr; - char *myaddr; - int len; - int write; - struct mem_attrib *attrib; - struct target_ops *target; -{ - int ns; - int nu; - - if (memaddr >= ksym_maxuseraddr()) - nu = 0; - else - { - nu = xfer_umem (memaddr, myaddr, len, write); - if (nu <= 0) - return (0); - if (nu == len) - return (nu); - memaddr += nu; - if (memaddr != ksym_maxuseraddr()) - 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; +/* + * Symbol names of kernel entry points. Use special frames. + */ +#define KSYM_TRAP "calltrap" +#define KSYM_INTR "Xintr" +#define KSYM_FASTINTR "Xfastintr" +#define KSYM_SYSCALL "Xsyscall" - 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; -} +/* + * 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 }; -static CORE_ADDR -ksym_kernbase() +CORE_ADDR +fbsd_kern_frame_saved_pc (fr) +struct frame_info *fr; { - static CORE_ADDR kernbase; - struct minimal_symbol *sym; + struct minimal_symbol *sym; + CORE_ADDR this_saved_pc; + enum frametype frametype; - if (kernbase == 0) - { - sym = lookup_minimal_symbol ("kernbase", NULL, NULL); - if (sym == NULL) { - kernbase = KERNBASE; - } else { - kernbase = SYMBOL_VALUE_ADDRESS (sym); - } - } - return kernbase; -} + 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_INTR, + strlen(KSYM_INTR)) == 0 || strncmp (SYMBOL_NAME(sym), + KSYM_FASTINTR, strlen(KSYM_FASTINTR)) == 0) + frametype = tf_interrupt; + else if (strcmp (SYMBOL_NAME(sym), KSYM_SYSCALL) == 0) + frametype = tf_syscall; + } -#define KERNOFF (ksym_kernbase()) -#define INKERNEL(x) ((x) >= KERNOFF) + switch (frametype) { + case tf_normal: + return (this_saved_pc); +#define oEIP offsetof(struct trapframe, tf_eip) -static CORE_ADDR sbr; -static CORE_ADDR curpcb; -static int found_pcb; -static int devmem; -static int kfd; -static struct pcb pcb; + case tf_trap: + return (read_memory_integer (fr->frame + 8 + oEIP, 4)); -static void -set_proc_cmd (arg, from_tty) - char *arg; - int from_tty; -{ - CORE_ADDR paddr; - struct kinfo_proc *kp; - int cnt = 0; + case tf_interrupt: + return (read_memory_integer (fr->frame + 12 + oEIP, 4)); - 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"); - } + case tf_syscall: + return (read_memory_integer (fr->frame + 8 + oEIP, 4)); +#undef oEIP + } } -static void -set_cpu_cmd (arg, from_tty) - char *arg; - int from_tty; +static int +fetch_kcore_registers (struct pcb *pcb) { - 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"); + int i; + int noreg; - pcpu = pcaddr; - curpcb = kvtophys(cfd, pcpu + PCPU_OFFSET (curpcb)); - physrd (cfd, curpcb, (char*)&curpcb, sizeof curpcb); + /* + * 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); - 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); + 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); - if ((cur_proc = curProc())) - target_fetch_registers (-1); + for (i = 9; i < 14; ++i) /* eflags, cs, ss, ds, es, fs */ + supply_register (i, (char *)&noreg); + supply_register (15, (char *)&pcb->pcb_gs); - /* 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); + /* XXX 80387 registers? */ } -/* 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; +#endif /* __i386__ */ - 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); - } +/* 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. */ - physrd (cfd, ksym_lookup ("IdlePTD") - KERNOFF, (char*)&sbr, sizeof sbr); - printf ("IdlePTD at physical address 0x%08lx\n", (unsigned long)sbr); - curpcb = kvtophys(cfd, pcpu + PCPU_OFFSET (curpcb)); - physrd (cfd, curpcb, (char*)&curpcb, sizeof curpcb); +/* We just get all the registers, so we don't use regno. */ - 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 physical address 0x%08lx\n", (unsigned long)paddr); +/* ARGSUSED */ +static void +get_kcore_registers (regno) + int regno; +{ - return (cfd); -} + /* + * 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... + */ -static int -kvm_close (fd) - int fd; -{ - return (close (fd)); + /* + * Zero out register set then fill in the ones we know about. + */ + fetch_kcore_registers (&cur_pcb); } -static int -kvm_write (core_kd, memaddr, myaddr, len) - int core_kd; - CORE_ADDR memaddr; - char *myaddr; +static void +kcore_files_info (t) + struct target_ops *t; { - 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 */ + 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 -kvm_read (core_kd, memaddr, myaddr, len) - int core_kd; - CORE_ADDR memaddr; - char *myaddr; +ignore (addr, contents) + CORE_ADDR addr; + char *contents; { - return (kernel_core_file_hook (core_kd, memaddr, myaddr, len)); + return 0; } static int -kvm_uread (core_kd, p, memaddr, myaddr, len) - int core_kd; - register struct proc *p; - CORE_ADDR memaddr; - char *myaddr; - int len; +xfer_kmem (memaddr, myaddr, len, write, target) + CORE_ADDR memaddr; + char *myaddr; + int len; + int write; + struct target_ops *target; { - register char *cp; - char procfile[MAXPATHLEN]; - ssize_t amount; - int fd; + int n; - 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; + if (!INKERNEL(memaddr)) + return xfer_umem(memaddr, myaddr, len, write); -/* - * 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); -} + if (core_kd == NULL) + 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); + 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 (&kp); -} -static CORE_ADDR -kvm_getpcpu (cfd, cpuid) -int cfd, cpuid; -{ - SLIST_HEAD(, pcpu) pcpu_head; - struct pcpu lpc; - struct pcpu *pc; - - physrd (cfd, ksym_lookup ("cpuhead") - KERNOFF, (char*)&pcpu_head, - sizeof pcpu_head); - pc = SLIST_FIRST (&pcpu_head); - for (; pc != NULL; pc = SLIST_NEXT (&lpc, pc_allcpu)) - { - kvm_read (cfd, (CORE_ADDR)pc, (char*)&lpc, sizeof lpc); - if (lpc.pc_cpuid == cpuid) - break; - } - - return ((CORE_ADDR)pc); + return n; } -/* - * 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; +xfer_umem (memaddr, myaddr, len, write) + CORE_ADDR memaddr; + char *myaddr; + int len; + int write; /* ignored */ { - CORE_ADDR v; - unsigned int pte; - static CORE_ADDR PTD = -1; - CORE_ADDR current_ptd; + int n = 0; - /* - * 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 (cur_proc == 0) { + error("---Can't read userspace from dump, or kernel process---\n"); + return 0; + } - if (INKERNEL (addr)) - current_ptd = sbr; - else if (found_pcb == 0) - { - if (PTD == -1) - PTD = kvtophys (fd, ksym_lookup ("PTD")); - current_ptd = PTD; - } + if (write) + error("kvm_uwrite unimplemented\n"); else -#ifdef __i386__ - current_ptd = pcb.pcb_cr3; -#else - assert(0); -#endif - - /* - * Read the first-level page table (ptd). - */ -#ifdef __i386__ - v = current_ptd + ( (unsigned)addr >> PDRSHIFT) * sizeof pte; -#else - v = current_ptd + ( (unsigned)addr ) * sizeof pte; -#endif - if (physrd (fd, v, (char *)&pte, sizeof pte) < 0 || (pte&PG_V) == 0) - return (~0); + n = kvm_uread(core_kd, cur_proc, memaddr, myaddr, len) ; -#ifdef __i386__ - if (pte & PG_PS) -#else - if (pte ) -#endif - { - /* - * 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). - */ -#ifdef __i386__ -#define PAGE4M_MASK (NBPDR - 1) -#else -#define PAGE4M_MASK 0 -#endif -#define PG_FRAME4M (~PAGE4M_MASK) - addr = (pte & PG_FRAME4M) + (addr & PAGE4M_MASK); - } - else - { - /* - * Read the second-level page table. - */ -#ifdef __i386__ - v = (pte&PG_FRAME) + ((addr >> PAGE_SHIFT)&(NPTEPG-1)) * sizeof pte; -#else - v = (pte ) + ((addr >> PAGE_SHIFT)&(NPTEPG-1)) * sizeof pte; -#endif - if (physrd (fd, v, (char *) &pte, sizeof (pte)) < 0 || (pte&PG_V) == 0) - return (~0); + if (n < 0) + return 0; -#ifdef __i386__ - addr = (pte & PG_FRAME) + (addr & PAGE_MASK); -#else - addr = (pte ) + (addr & PAGE_MASK); -#endif - } -#if 0 - printf ("vtophys (%x) -> %x\n", oldaddr, addr); -#endif - return (addr); + return n; } -static int -read_pcb (fd, uaddr) - int fd; - CORE_ADDR uaddr; +static void +set_proc_cmd(arg) + char *arg; { - 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); -#ifdef __i386__ - 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); -#endif - for (i = 9; i < 14; ++i) /* eflags, cs, ss, ds, es, fs */ - supply_register (i, (char *)&noreg); -#ifdef __i386__ - supply_register (15, (char *)&pcb.pcb_gs); -#endif - - /* XXX 80387 registers? */ -} + CORE_ADDR addr, pid_addr, first_td; + void *val; + struct kinfo_proc *kp; + int cnt; + pid_t pid; -/* - * 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. - */ + 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); + + if (!INKERNEL(addr)) { + kp = kvm_getprocs(core_kd, KERN_PROC_PID, addr, &cnt); + if (!cnt) { + error("invalid pid"); + } + addr = (CORE_ADDR)kp->ki_paddr; + cur_proc = kp; + } else { + /* update cur_proc */ + pid_addr = addr + offsetof(struct proc, p_pid); + if (kvread(pid_addr, &pid)) + error("cannot read pid ptr"); + cur_proc = kvm_getprocs(core_kd, KERN_PROC_PID, pid, &cnt); + if (!cnt) { + error("invalid pid"); + } + } -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; + /* Find the first thread in the process XXXKSE */ + addr += offsetof(struct proc, p_threads.tqh_first); + if (kvread(addr, &first_td)) + error("cannot read thread ptr"); - cp = buf; + /* Read the PCB address in thread structure. */ + addr = first_td + offsetof(struct thread, td_pcb); + if (kvread(addr, &val)) + error("cannot read pcb ptr"); - 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); + /* Read the PCB address in proc structure. */ + if (set_context((CORE_ADDR)val)) + error("invalid proc address"); } -static struct target_ops kcore_ops; void _initialize_kcorelow() @@ -1066,7 +665,7 @@ _initialize_kcorelow() 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_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; @@ -1077,5 +676,4 @@ _initialize_kcorelow() 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"); } -- cgit v1.1