244 lines
6.4 KiB
C
244 lines
6.4 KiB
C
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/* Low level Alpha interface, for GDB when running native.
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Copyright 1993, 1995, 1996 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <sys/user.h>
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/* Size of elements in jmpbuf */
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#define JB_ELEMENT_SIZE 8
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/* The definition for JB_PC in machine/reg.h is wrong.
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And we can't get at the correct definition in setjmp.h as it is
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not always available (eg. if _POSIX_SOURCE is defined which is the
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default). As the defintion is unlikely to change (see comment
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in <setjmp.h>, define the correct value here. */
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#undef JB_PC
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#define JB_PC 2
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/* Figure out where the longjmp will land.
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We expect the first arg to be a pointer to the jmp_buf structure from which
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we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
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This routine returns true on success. */
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int
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get_longjmp_target (pc)
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CORE_ADDR *pc;
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{
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CORE_ADDR jb_addr;
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char raw_buffer[MAX_REGISTER_RAW_SIZE];
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jb_addr = read_register(A0_REGNUM);
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if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
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sizeof(CORE_ADDR)))
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return 0;
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*pc = extract_address (raw_buffer, sizeof(CORE_ADDR));
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return 1;
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}
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/* Extract the register values out of the core file and store
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them where `read_register' will find them.
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CORE_REG_SECT points to the register values themselves, read into memory.
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CORE_REG_SIZE is the size of that area.
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WHICH says which set of registers we are handling (0 = int, 2 = float
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on machines where they are discontiguous).
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REG_ADDR is the offset from u.u_ar0 to the register values relative to
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core_reg_sect. This is used with old-fashioned core files to
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locate the registers in a large upage-plus-stack ".reg" section.
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Original upage address X is at location core_reg_sect+x+reg_addr.
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*/
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static void
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fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
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char *core_reg_sect;
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unsigned core_reg_size;
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int which;
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unsigned reg_addr;
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{
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register int regno;
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register int addr;
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int bad_reg = -1;
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/* Table to map a gdb regnum to an index in the core register section.
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The floating point register values are garbage in OSF/1.2 core files. */
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static int core_reg_mapping[NUM_REGS] =
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{
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#define EFL (EF_SIZE / 8)
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EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
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EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
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EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
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EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
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EFL+0, EFL+1, EFL+2, EFL+3, EFL+4, EFL+5, EFL+6, EFL+7,
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EFL+8, EFL+9, EFL+10, EFL+11, EFL+12, EFL+13, EFL+14, EFL+15,
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EFL+16, EFL+17, EFL+18, EFL+19, EFL+20, EFL+21, EFL+22, EFL+23,
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EFL+24, EFL+25, EFL+26, EFL+27, EFL+28, EFL+29, EFL+30, EFL+31,
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EF_PC, -1
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};
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static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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if (CANNOT_FETCH_REGISTER (regno))
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{
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supply_register (regno, zerobuf);
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continue;
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}
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addr = 8 * core_reg_mapping[regno];
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if (addr < 0 || addr >= core_reg_size)
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{
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if (bad_reg < 0)
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bad_reg = regno;
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}
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else
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{
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supply_register (regno, core_reg_sect + addr);
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}
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}
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if (bad_reg >= 0)
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{
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error ("Register %s not found in core file.", reg_names[bad_reg]);
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}
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}
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/* Map gdb internal register number to a ptrace ``address''.
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These ``addresses'' are defined in <sys/ptrace.h> */
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#define REGISTER_PTRACE_ADDR(regno) \
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(regno < FP0_REGNUM ? GPR_BASE + (regno) \
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: regno == PC_REGNUM ? PC \
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: regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \
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: 0)
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/* Return the ptrace ``address'' of register REGNO. */
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unsigned int
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register_addr (regno, blockend)
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int regno;
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int blockend;
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{
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return REGISTER_PTRACE_ADDR (regno);
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}
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int
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kernel_u_size ()
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{
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return (sizeof (struct user));
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}
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#ifdef USE_PROC_FS
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#include <sys/procfs.h>
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/*
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* See the comment in m68k-tdep.c regarding the utility of these functions.
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*/
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void
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supply_gregset (gregsetp)
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gregset_t *gregsetp;
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{
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register int regi;
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register long *regp = gregsetp->regs;
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static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
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for (regi = 0; regi < 31; regi++)
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supply_register (regi, (char *)(regp + regi));
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supply_register (PC_REGNUM, (char *)(regp + 31));
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/* Fill inaccessible registers with zero. */
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supply_register (ZERO_REGNUM, zerobuf);
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supply_register (FP_REGNUM, zerobuf);
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}
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void
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fill_gregset (gregsetp, regno)
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gregset_t *gregsetp;
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int regno;
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{
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int regi;
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register long *regp = gregsetp->regs;
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for (regi = 0; regi < 31; regi++)
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if ((regno == -1) || (regno == regi))
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*(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)];
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if ((regno == -1) || (regno == PC_REGNUM))
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*(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)];
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}
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/*
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* Now we do the same thing for floating-point registers.
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* Again, see the comments in m68k-tdep.c.
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*/
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void
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supply_fpregset (fpregsetp)
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fpregset_t *fpregsetp;
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{
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register int regi;
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register long *regp = fpregsetp->regs;
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for (regi = 0; regi < 32; regi++)
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supply_register (regi + FP0_REGNUM, (char *)(regp + regi));
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}
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void
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fill_fpregset (fpregsetp, regno)
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fpregset_t *fpregsetp;
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int regno;
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{
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int regi;
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register long *regp = fpregsetp->regs;
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for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
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{
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if ((regno == -1) || (regno == regi))
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{
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*(regp + regi - FP0_REGNUM) =
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*(long *) ®isters[REGISTER_BYTE (regi)];
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}
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}
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}
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#endif
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/* Register that we are able to handle alpha core file formats. */
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static struct core_fns alpha_core_fns =
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{
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bfd_target_aout_flavour,
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fetch_core_registers,
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NULL
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};
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void
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_initialize_core_alpha ()
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{
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add_core_fns (&alpha_core_fns);
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}
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