/* Low level DECstation interface to ptrace, for GDB when running native. Copyright 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1999, 2000, 2001 Free Software Foundation, Inc. Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. 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. */ #include "defs.h" #include "inferior.h" #include "gdbcore.h" #include "regcache.h" #include <sys/ptrace.h> #include <sys/types.h> #include <sys/param.h> #include <sys/user.h> #undef JB_S0 #undef JB_S1 #undef JB_S2 #undef JB_S3 #undef JB_S4 #undef JB_S5 #undef JB_S6 #undef JB_S7 #undef JB_SP #undef JB_S8 #undef JB_PC #undef JB_SR #undef NJBREGS #include <setjmp.h> /* For JB_XXX. */ /* Size of elements in jmpbuf */ #define JB_ELEMENT_SIZE 4 /* Map gdb internal register number to ptrace ``address''. These ``addresses'' are defined in DECstation <sys/ptrace.h> */ static int register_ptrace_addr (int regno) { return (regno < 32 ? GPR_BASE + regno : regno == mips_regnum (current_gdbarch)->pc ? PC : regno == mips_regnum (current_gdbarch)->cause ? CAUSE : regno == mips_regnum (current_gdbarch)->hi ? MMHI : regno == mips_regnum (current_gdbarch)->lo ? MMLO : regno == mips_regnum (current_gdbarch)->fp_control_status ? FPC_CSR : regno == mips_regnum (current_gdbarch)->fp_implementation_revision ? FPC_EIR : regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) : 0); } static void fetch_core_registers (char *, unsigned, int, CORE_ADDR); /* Get all registers from the inferior */ void fetch_inferior_registers (int regno) { unsigned int regaddr; char buf[MAX_REGISTER_SIZE]; int i; char zerobuf[MAX_REGISTER_SIZE]; memset (zerobuf, 0, MAX_REGISTER_SIZE); deprecated_registers_fetched (); for (regno = 1; regno < NUM_REGS; regno++) { regaddr = register_ptrace_addr (regno); for (i = 0; i < DEPRECATED_REGISTER_RAW_SIZE (regno); i += sizeof (int)) { *(int *) &buf[i] = ptrace (PT_READ_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) regaddr, 0); regaddr += sizeof (int); } supply_register (regno, buf); } supply_register (ZERO_REGNUM, zerobuf); /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ supply_register (DEPRECATED_FP_REGNUM, zerobuf); } /* Store our register values back into the inferior. If REGNO is -1, do this for all registers. Otherwise, REGNO specifies which register (so we can save time). */ void store_inferior_registers (int regno) { unsigned int regaddr; char buf[80]; if (regno > 0) { if (regno == ZERO_REGNUM || regno == PS_REGNUM || regno == mips_regnum (current_gdbarch)->badvaddr || regno == mips_regnum (current_gdbarch)->cause || regno == mips_regnum (current_gdbarch)->fp_implementation_revision || regno == DEPRECATED_FP_REGNUM || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM)) return; regaddr = register_ptrace_addr (regno); errno = 0; ptrace (PT_WRITE_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) regaddr, read_register (regno)); if (errno != 0) { sprintf (buf, "writing register number %d", regno); perror_with_name (buf); } } else { for (regno = 0; regno < NUM_REGS; regno++) store_inferior_registers (regno); } } /* Figure out where the longjmp will land. We expect the first arg to be a pointer to the jmp_buf structure from which we extract the pc (JB_PC) that we will land at. The pc is copied into PC. This routine returns true on success. */ int get_longjmp_target (CORE_ADDR *pc) { CORE_ADDR jb_addr; char *buf; buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); jb_addr = read_register (A0_REGNUM); if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) return 0; *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); return 1; } /* Extract the register values out of the core file and store them where `read_register' will find them. CORE_REG_SECT points to the register values themselves, read into memory. CORE_REG_SIZE is the size of that area. WHICH says which set of registers we are handling (0 = int, 2 = float on machines where they are discontiguous). REG_ADDR is the offset from u.u_ar0 to the register values relative to core_reg_sect. This is used with old-fashioned core files to locate the registers in a large upage-plus-stack ".reg" section. Original upage address X is at location core_reg_sect+x+reg_addr. */ static void fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, CORE_ADDR reg_addr) { int regno; unsigned int addr; int bad_reg = -1; reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ char zerobuf[MAX_REGISTER_SIZE]; memset (zerobuf, 0, MAX_REGISTER_SIZE); /* If u.u_ar0 was an absolute address in the core file, relativize it now, so we can use it as an offset into core_reg_sect. When we're done, "register 0" will be at core_reg_sect+reg_ptr, and we can use register_addr to offset to the other registers. If this is a modern core file without a upage, reg_ptr will be zero and this is all a big NOP. */ if (reg_ptr > core_reg_size) #ifdef KERNEL_U_ADDR reg_ptr -= KERNEL_U_ADDR; #else error ("Old mips core file can't be processed on this machine."); #endif for (regno = 0; regno < NUM_REGS; regno++) { addr = register_addr (regno, reg_ptr); if (addr >= core_reg_size) { if (bad_reg < 0) bad_reg = regno; } else { supply_register (regno, core_reg_sect + addr); } } if (bad_reg >= 0) { error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); } supply_register (ZERO_REGNUM, zerobuf); /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */ supply_register (DEPRECATED_FP_REGNUM, zerobuf); } /* Return the address in the core dump or inferior of register REGNO. BLOCKEND is the address of the end of the user structure. */ CORE_ADDR register_addr (int regno, CORE_ADDR blockend) { CORE_ADDR addr; if (regno < 0 || regno >= NUM_REGS) error ("Invalid register number %d.", regno); REGISTER_U_ADDR (addr, blockend, regno); return addr; } /* Register that we are able to handle mips core file formats. FIXME: is this really bfd_target_unknown_flavour? */ static struct core_fns mips_core_fns = { bfd_target_unknown_flavour, /* core_flavour */ default_check_format, /* check_format */ default_core_sniffer, /* core_sniffer */ fetch_core_registers, /* core_read_registers */ NULL /* next */ }; void _initialize_core_mips (void) { add_core_fns (&mips_core_fns); }