diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c')
-rw-r--r-- | gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c | 802 |
1 files changed, 0 insertions, 802 deletions
diff --git a/gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c b/gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c deleted file mode 100644 index 323f751..0000000 --- a/gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c +++ /dev/null @@ -1,802 +0,0 @@ -/* Native-dependent code for BSD Unix running on i386's, for GDB. - Copyright 1988, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. - - $FreeBSD$ -*/ - -#include <sys/types.h> -#include <sys/param.h> -#include <signal.h> -#include <sys/user.h> -#include <machine/reg.h> -#include <machine/frame.h> -#include <sys/ptrace.h> - -#include "defs.h" -#include "symtab.h" - -/* this table must line up with REGISTER_NAMES in tm-i386v.h */ -/* symbols like 'tEAX' come from <machine/reg.h> */ -static int tregmap[] = -{ - tEAX, tECX, tEDX, tEBX, - tESP, tEBP, tESI, tEDI, - tEIP, tEFLAGS, tCS, tSS, - tDS, tES, tSS, tSS, /* lies: no fs or gs */ -}; - -/* blockend is the value of u.u_ar0, and points to the - place where ES is stored. */ - -int -i386_register_u_addr (blockend, regnum) - int blockend; - int regnum; -{ - return (blockend + 4 * tregmap[regnum]); -} - - -#define fpstate save87 -#define U_FPSTATE(u) u.u_pcb.pcb_savefpu - -static void -i387_to_double (from, to) - char *from; - char *to; -{ - long *lp; - /* push extended mode on 387 stack, then pop in double mode - * - * first, set exception masks so no error is generated - - * number will be rounded to inf or 0, if necessary - */ - asm ("pushl %eax"); /* grab a stack slot */ - asm ("fstcw (%esp)"); /* get 387 control word */ - asm ("movl (%esp),%eax"); /* save old value */ - asm ("orl $0x3f,%eax"); /* mask all exceptions */ - asm ("pushl %eax"); - asm ("fldcw (%esp)"); /* load new value into 387 */ - - asm ("movl 8(%ebp),%eax"); - asm ("fldt (%eax)"); /* push extended number on 387 stack */ - asm ("fwait"); - asm ("movl 12(%ebp),%eax"); - asm ("fstpl (%eax)"); /* pop double */ - asm ("fwait"); - - asm ("popl %eax"); /* flush modified control word */ - asm ("fnclex"); /* clear exceptions */ - asm ("fldcw (%esp)"); /* restore original control word */ - asm ("popl %eax"); /* flush saved copy */ -} - -#if 0 -static void -double_to_i387 (from, to) - char *from; - char *to; -{ - /* push double mode on 387 stack, then pop in extended mode - * no errors are possible because every 64-bit pattern - * can be converted to an extended - */ - asm ("movl 8(%ebp),%eax"); - asm ("fldl (%eax)"); - asm ("fwait"); - asm ("movl 12(%ebp),%eax"); - asm ("fstpt (%eax)"); - asm ("fwait"); -} -#endif - -struct env387 -{ - unsigned short control; - unsigned short r0; - unsigned short status; - unsigned short r1; - unsigned short tag; - unsigned short r2; - unsigned long eip; - unsigned short code_seg; - unsigned short opcode; - unsigned long operand; - unsigned short operand_seg; - unsigned short r3; - unsigned char regs[8][10]; -}; - -/* static */ void -print_387_control_word (control) -unsigned int control; -{ - printf ("control 0x%04x: ", control); - printf ("compute to "); - switch ((control >> 8) & 3) - { - case 0: printf ("24 bits; "); break; - case 1: printf ("(bad); "); break; - case 2: printf ("53 bits; "); break; - case 3: printf ("64 bits; "); break; - } - printf ("round "); - switch ((control >> 10) & 3) - { - case 0: printf ("NEAREST; "); break; - case 1: printf ("DOWN; "); break; - case 2: printf ("UP; "); break; - case 3: printf ("CHOP; "); break; - } - if (control & 0x3f) - { - printf ("mask:"); - if (control & 0x0001) printf (" INVALID"); - if (control & 0x0002) printf (" DENORM"); - if (control & 0x0004) printf (" DIVZ"); - if (control & 0x0008) printf (" OVERF"); - if (control & 0x0010) printf (" UNDERF"); - if (control & 0x0020) printf (" LOS"); - printf (";"); - } - printf ("\n"); - if (control & 0xe080) printf ("warning: reserved bits on 0x%x\n", - control & 0xe080); -} - -/* static */ void -print_387_status_word (status) - unsigned int status; -{ - printf ("status 0x%04x: ", status); - if (status & 0xff) - { - printf ("exceptions:"); - if (status & 0x0001) printf (" INVALID"); - if (status & 0x0002) printf (" DENORM"); - if (status & 0x0004) printf (" DIVZ"); - if (status & 0x0008) printf (" OVERF"); - if (status & 0x0010) printf (" UNDERF"); - if (status & 0x0020) printf (" LOS"); - if (status & 0x0040) printf (" FPSTACK"); - printf ("; "); - } - printf ("flags: %d%d%d%d; ", - (status & 0x4000) != 0, - (status & 0x0400) != 0, - (status & 0x0200) != 0, - (status & 0x0100) != 0); - - printf ("top %d\n", (status >> 11) & 7); -} - -static void -print_387_status (status, ep) - unsigned short status; - struct env387 *ep; -{ - int i; - int bothstatus; - int top; - int fpreg; - unsigned char *p; - - bothstatus = ((status != 0) && (ep->status != 0)); - if (status != 0) - { - if (bothstatus) - printf ("u: "); - print_387_status_word ((unsigned int)status); - } - - if (ep->status != 0) - { - if (bothstatus) - printf ("e: "); - print_387_status_word ((unsigned int)ep->status); - } - - print_387_control_word ((unsigned int)ep->control); - printf ("opcode 0x%x; ", ep->opcode); - printf ("pc 0x%x:0x%x; ", ep->code_seg, ep->eip); - printf ("operand 0x%x:0x%x\n", ep->operand_seg, ep->operand); - - top = (ep->status >> 11) & 7; - - printf (" regno tag msb lsb value\n"); - for (fpreg = 7; fpreg >= 0; fpreg--) - { - int st_regno; - double val; - - /* The physical regno `fpreg' is only relevant as an index into the - * tag word. Logical `%st' numbers are required for indexing ep->regs. - */ - st_regno = (fpreg + 8 - top) & 7; - - printf ("%%st(%d) %s ", st_regno, fpreg == top ? "=>" : " "); - - switch ((ep->tag >> (fpreg * 2)) & 3) - { - case 0: printf ("valid "); break; - case 1: printf ("zero "); break; - case 2: printf ("trap "); break; - case 3: printf ("empty "); break; - } - for (i = 9; i >= 0; i--) - printf ("%02x", ep->regs[st_regno][i]); - - i387_to_double (ep->regs[st_regno], (char *)&val); - printf (" %g\n", val); - } -} - -void -i386_float_info () -{ - struct user u; /* just for address computations */ - int i; - /* fpstate defined in <sys/user.h> */ - struct fpstate *fpstatep; - char buf[sizeof (struct fpstate) + 2 * sizeof (int)]; - unsigned int uaddr; - char fpvalid; - unsigned int rounded_addr; - unsigned int rounded_size; - /*extern int corechan;*/ - int skip; - extern int inferior_pid; - - uaddr = (char *)&U_FPSTATE(u) - (char *)&u; - if (inferior_pid) - { - int *ip; - - rounded_addr = uaddr & -sizeof (int); - rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) + - sizeof (int) - 1) / sizeof (int); - skip = uaddr - rounded_addr; - - ip = (int *)buf; - for (i = 0; i < rounded_size; i++) - { - *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0); - rounded_addr += sizeof (int); - } - } - else - { -#if 1 - printf("float info: can't do a core file (yet)\n"); - return; -#else - if (lseek (corechan, uaddr, 0) < 0) - perror_with_name ("seek on core file"); - if (myread (corechan, buf, sizeof (struct fpstate)) < 0) - perror_with_name ("read from core file"); - skip = 0; -#endif - } - - fpstatep = (struct fpstate *)(buf + skip); - print_387_status (fpstatep->sv_ex_sw, (struct env387 *)fpstatep); -} - -#ifdef SETUP_ARBITRARY_FRAME -FRAME -setup_arbitrary_frame (numargs, args) -int numargs; -unsigned int *args; -{ - if (numargs > 2) - error ("Too many args in frame specification"); - return create_new_frame ((CORE_ADDR)args[0], (CORE_ADDR)args[1]); -} -#endif - -#ifdef KERNEL_DEBUG -#include <sys/proc.h> -#include <sys/stat.h> -#include <sys/fcntl.h> -#include <sys/sysctl.h> -#include <unistd.h> - -#include <vm/vm.h> -#include <vm/vm_param.h> - -#include <machine/vmparam.h> -#include <machine/pcb.h> -#include <machine/frame.h> - -#define KERNOFF ((unsigned)KERNBASE) -#define INKERNEL(x) ((x) >= KERNOFF) - -static CORE_ADDR sbr; -static CORE_ADDR curpcb; -static CORE_ADDR kstack; -static int found_pcb; -static int devmem; -static int kfd; -static struct pcb pcb; -int read_pcb (int, CORE_ADDR); -static CORE_ADDR kvtophys (int, CORE_ADDR); -static physrd(int, u_int, char*, int); - -extern CORE_ADDR ksym_lookup(const char *); - -/* 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 */ -kvm_open (efile, cfile, sfile, perm, errout) -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; - CORE_ADDR addr; - int cfd; - - if ((cfd = open(cfile, perm, 0)) < 0) - return (cfd); - - fstat(cfd, &stb); - if ((stb.st_mode & S_IFMT) == S_IFCHR && stb.st_rdev == makedev(2, 0)) { - devmem = 1; - kfd = open ("/dev/kmem", perm, 0); - } - - physrd(cfd, ksym_lookup("IdlePTD") - KERNOFF, (char*)&sbr, sizeof sbr); - printf("IdlePTD %x\n", sbr); - curpcb = ksym_lookup("curpcb") - KERNOFF; - physrd(cfd, curpcb, (char*)&curpcb, sizeof curpcb); - kstack = ksym_lookup("kstack"); - - found_pcb = 1; /* for vtophys */ - if (!devmem) - read_pcb(cfd, ksym_lookup("dumppcb") - KERNOFF); - else - read_pcb(cfd, kvtophys(cfd, kstack)); - - return (cfd); -} - -kvm_close (fd) -{ - return (close (fd)); -} - -kvm_write(core_kd, memaddr, myaddr, len) -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 */ -} - -kvm_read(core_kd, memaddr, myaddr, len) -CORE_ADDR memaddr; -char *myaddr; -{ - return (kernel_core_file_hook (core_kd, memaddr, myaddr, len)); -} - -kvm_uread(core_kd, p, memaddr, myaddr, len) -register struct proc *p; -CORE_ADDR memaddr; -char *myaddr; -{ - register char *cp; - char procfile[MAXPATHLEN]; - ssize_t amount; - int fd; - - if (devmem) { - cp = myaddr; - - 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); - } - - while (len > 0) { - if (lseek(fd, 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; - } - 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 - */ -int -kvm_proclist (cfd, pid, p, cnt) -int cfd, pid, *cnt; -struct proc *p; -{ - struct proc lp; - - for (; p != NULL; p = lp.p_list.le_next) { - if (!kvm_read(cfd, (CORE_ADDR)p, (char *)&lp, sizeof (lp))) - return (0); - if (lp.p_pid != pid) - continue; - kp.kp_eproc.e_paddr = p; - *cnt = 1; - return (1); - } - *cnt = 0; - return (0); -} - -/* - * try to do what kvm_deadprocs in libkvm would do - */ -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); -} - -/* - * try to do what kvm_getprocs in libkvm would do - */ -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 -physrd(cfd, addr, dat, len) -u_int addr; -char *dat; -{ - if (lseek(cfd, (off_t)addr, L_SET) == -1) - return (-1); - return (read(cfd, dat, len)); -} - -static CORE_ADDR -kvtophys (fd, addr) -CORE_ADDR addr; -{ - CORE_ADDR v; - unsigned int pte; - static CORE_ADDR PTD = -1; - CORE_ADDR current_ptd; -#ifdef DEBUG_KVTOPHYS - CORE_ADDR oldaddr = addr; -#endif - - /* - * If we're looking at the kernel stack, - * munge the address to refer to the user space mapping instead; - * that way we get the requested process's kstack, not the running one. - */ - /* - * this breaks xlating user addresses from a crash dump so only - * do it for a "live" kernel. - */ - if (devmem && addr >= kstack && addr < kstack + ctob(UPAGES)) - addr = (addr - kstack) + curpcb; - - /* - * 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); - - /* - * 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); -#ifdef DEBUG_KVTOPHYS - printf("vtophys(%x) -> %x\n", oldaddr, addr); -#endif - return (addr); -} - -read_pcb (fd, uaddr) -CORE_ADDR uaddr; -{ - int i; - int *pcb_regs = (int *)&pcb; - int eip; - 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); - } - printf("current pcb at %#x\n", uaddr); - - /* - * get the register values out of the sys pcb and - * store them where `read_register' will find them. - */ - for (i = 0; i < 8; ++i) - supply_register(i, &pcb_regs[i+10]); - supply_register(8, &pcb_regs[8]); /* eip */ - supply_register(9, &pcb_regs[9]); /* eflags */ - for (i = 10; i < 13; ++i) /* cs, ss, ds */ - supply_register(i, &pcb_regs[i+9]); - supply_register(13, &pcb_regs[18]); /* es */ - for (i = 14; i < 16; ++i) /* fs, gs */ - supply_register(i, &pcb_regs[i+8]); - -#if 0 /* doesn't work ??? */ - /* Hmm... */ - if (target_read_memory(pcb_regs[5+10]+4, &eip, sizeof eip, 0)) - error("Cannot read PC."); - supply_register(8, &eip); /* eip */ -#endif - - /* 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. - */ -kernel_core_file_hook(fd, addr, buf, len) - 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); -#ifdef DEBUG_KCFH -if(!INKERNEL(addr)) -fprintf(stderr,"addr 0x%x, paddr 0x%x\n", addr, paddr); -#endif - if (paddr == ~0) { - bzero(buf, 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) { - bzero(cp, len); - return (cp - buf); - } - cp += cc; - addr += cc; - len -= cc; - } - return (cp - buf); -} - -/* - * 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), "calltrap") == 0) - frametype = tf_trap; - else if (strncmp (SYMBOL_NAME(sym), "Xresume", 7) == 0) - frametype = tf_interrupt; - else if (strcmp (SYMBOL_NAME(sym), "Xsyscall") == 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 - } -} - -CORE_ADDR -fbsd_kern_frame_chain (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), "calltrap") == 0) - frametype = tf_trap; - else if (strncmp (SYMBOL_NAME(sym), "Xresume", 7) == 0) - frametype = tf_interrupt; - else if (strcmp (SYMBOL_NAME(sym), "_Xsyscall") == 0) - frametype = tf_syscall; - } - - switch (frametype) { - case tf_normal: - return (read_memory_integer (fr->frame, 4)); - -#define oEBP offsetof(struct trapframe, tf_ebp) - - case tf_trap: - return (read_memory_integer (fr->frame + 8 + oEBP, 4)); - - case tf_interrupt: - return (read_memory_integer (fr->frame + 16 + oEBP, 4)); - - case tf_syscall: - return (read_memory_integer (fr->frame + 8 + oEBP, 4)); -#undef oEBP - } -} - -#endif /* KERNEL_DEBUG */ |