/* Target-dependent code for the SPARC for GDB, the GNU debugger. Copyright 1986, 1987, 1989, 1991 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. */ /* * This is the target dependent code for an hp300 running BSD. */ #define __sys_stdtypes_h /* XXX defeat sun types file */ #include <sys/param.h> #include <stdio.h> #include "defs.h" #include "frame.h" #include "inferior.h" #include "obstack.h" #include "target.h" #include "ieee-float.h" #include <sys/ptrace.h> #include "gdbcore.h" #ifdef KERNELDEBUG #include <kvm.h> #include <sys/dir.h> #include <sys/user.h> #include <signal.h> #include <sys/ioctl.h> #include <fcntl.h> extern int kernel_debugging; CORE_ADDR ksym_lookup(); /* * Read the "thing" at address 'addr' into the space pointed to by P. * The length of the "thing" is determined by the type of P. * Result is non-zero if transfer fails. */ #define READMEM(addr, p) \ (target_read_memory((CORE_ADDR)(addr), (char *)(p), sizeof(*(p)))) #endif #ifdef KERNELDEBUG /* * The code below implements kernel debugging of crashdumps (or /dev/kmem) * or remote systems (via a serial link). For remote kernels, the remote * context does most the work, so there is very little to do -- we just * manage the kernel stack boundaries so we know where to stop a backtrace. * * The crashdump/kmem (kvm) support is a bit more grungy, but thanks to * libkvm (see kcore.c) not too bad. The main work is kvm_fetch_registers * which sucks the register state out of the current processes pcb. * There is a command that let's you set the current process -- hopefully, * to something that's blocked (in the live kernel case). */ /* XXX For misc_function_vector. */ #include "symtab.h" /* * Address ranges for the current process' kernel stack (fixed). */ static CORE_ADDR kernstack_top; static CORE_ADDR kernstack_bottom; static struct pcb *cpcb; void set_curproc(); /* * Return true if ADDR is a valid stack address according to the * current boundaries (which are determined by the currently running * user process). */ int inside_kernstack(addr) CORE_ADDR addr; { if (cpcb == 0) set_curproc(); return (addr > kernstack_bottom && addr < kernstack_top); } /* * (re-)set the variables that make inside_kernstack() work. */ void set_kernel_boundaries(p) struct pcb *p; { static CORE_ADDR kstack; if (kstack == 0) kstack = ksym_lookup("kstack"); kernstack_bottom = kstack; kernstack_top = kstack + UPAGES * NBPG; } /* * Return the current proc. masterprocp points to * current proc which points to current u area. */ struct pcb * fetch_cpcb() { struct pcb *p; static CORE_ADDR addr; if (addr == 0) addr = ksym_lookup("curpcb"); if (READMEM(addr, &p)) error("cannot read curpcb pointer at 0x%x\n", addr); return (p); } /* * Called from remote_wait, after the remote kernel has stopped. * Look up the current proc, and set up boundaries. * This is for active kernels only. */ void set_curproc() { cpcb = fetch_cpcb(); set_kernel_boundaries(cpcb); } /* * All code below is exclusively for support of kernel core files. */ /* * Fetch registers from a crashdump or /dev/kmem. */ static void kvm_fetch_registers(p) struct pcb *p; { int i; u_long v; struct pcb pcb; /* find the pcb for the current process */ if (READMEM(p, &pcb)) error("cannot read pcb at 0x%x", p); /* * Invalidate all the registers then fill in the ones we know about. */ registers_changed(); for (i = 2; i <= 7; ++i) supply_register(i, (char *)&pcb.pcb_regs[i - 2]); for (i = 10; i <= 15; ++i) supply_register(i, (char *)&pcb.pcb_regs[i - 4]); v = pcb.pcb_ps; supply_register(PS_REGNUM, (char *)&v); /* PC is on top of the stack */ if (READMEM(pcb.pcb_regs[11], &v) == 0) supply_register(PC_REGNUM, (char *)&v); } /* * Set the process context to that of the proc structure at * system address paddr. Read in the register state. */ int set_procaddr(paddr) CORE_ADDR paddr; { struct pcb *ppcb; if (paddr == 0) cpcb = fetch_cpcb(); else { struct proc *p = (struct proc *)paddr; if ((unsigned)p < KERNBASE) return (1); if (READMEM(&p->p_addr, &ppcb)) error("cannot read p_addr at 0x%x", &p->p_addr); cpcb = ppcb; } /* * Need to find current u area to get kernel stack and pcb * where "panic" saved registers. * (libkvm also needs to know current u area to get user * address space mapping). */ set_kernel_boundaries(cpcb); kvm_fetch_registers(cpcb); return (0); } /* * Get the registers out of a crashdump or /dev/kmem. * XXX This somehow belongs in kcore.c. * * We just get all the registers, so we don't use regno. */ /* ARGSUSED */ void kernel_core_registers (regno) int regno; { if (cpcb == 0) (void)set_procaddr(0); else kvm_fetch_registers(cpcb); } /* * XXX We intercept memory transfers since we must translate * fixed kernel stack addresses into per-process kernel addresses. */ int Xkernel_xfer_memory(addr, cp, len, write, target) CORE_ADDR addr; char *cp; int len; int write; struct target_ops *target; { if (cpcb && inside_kernstack(addr)) addr = addr - kernstack_bottom + (CORE_ADDR)cpcb; return kernel_xfer_memory(addr, cp, len, write, target); } #endif