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- /* Low level Alpha interface, for GDB when running native.
- Copyright 1993, 1995 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. */
-
- #include "defs.h"
- #include "inferior.h"
- #include "gdbcore.h"
- #include "target.h"
- #include <sys/ptrace.h>
- #include <machine/reg.h>
-
- /* Size of elements in jmpbuf */
-
- #define JB_ELEMENT_SIZE 8
-
- /* The definition for JB_PC in machine/reg.h is wrong.
- And we can't get at the correct definition in setjmp.h as it is
- not always available (eg. if _POSIX_SOURCE is defined which is the
- default). As the defintion is unlikely to change (see comment
- in <setjmp.h>, define the correct value here. */
-
- #undef JB_PC
- #define JB_PC 2
-
- /* 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 (pc)
- CORE_ADDR *pc;
- {
- CORE_ADDR jb_addr;
- char raw_buffer[MAX_REGISTER_RAW_SIZE];
-
- jb_addr = read_register(A0_REGNUM);
-
- if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, raw_buffer,
- sizeof(CORE_ADDR)))
- return 0;
-
- *pc = extract_address (raw_buffer, sizeof(CORE_ADDR));
- 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.
- */
-
- void
- fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
- char *core_reg_sect;
- unsigned core_reg_size;
- int which;
- unsigned reg_addr;
- {
- register int regno;
- register int addr;
- int bad_reg = -1;
-
- /* Table to map a gdb regnum to an index in the core register section.
- The floating point register values are garbage in OSF/1.2 core files. */
- static int core_reg_mapping[NUM_REGS] =
- {
- #define EFL (EF_SIZE / 8)
- EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
- EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
- EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
- EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
- EFL+0, EFL+1, EFL+2, EFL+3, EFL+4, EFL+5, EFL+6, EFL+7,
- EFL+8, EFL+9, EFL+10, EFL+11, EFL+12, EFL+13, EFL+14, EFL+15,
- EFL+16, EFL+17, EFL+18, EFL+19, EFL+20, EFL+21, EFL+22, EFL+23,
- EFL+24, EFL+25, EFL+26, EFL+27, EFL+28, EFL+29, EFL+30, EFL+31,
- EF_PC, -1
- };
- static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
-
- for (regno = 0; regno < NUM_REGS; regno++)
- {
- if (CANNOT_FETCH_REGISTER (regno))
- {
- supply_register (regno, zerobuf);
- continue;
- }
- addr = 8 * core_reg_mapping[regno];
- if (addr < 0 || 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.", reg_names[bad_reg]);
- }
- }
-
- /* Map gdb internal register number to a ptrace ``address''.
- These ``addresses'' are defined in <sys/ptrace.h> */
-
- #define REGISTER_PTRACE_ADDR(regno) \
- (regno < FP0_REGNUM ? GPR_BASE + (regno) \
- : regno == PC_REGNUM ? PC \
- : regno >= FP0_REGNUM ? FPR_BASE + ((regno) - FP0_REGNUM) \
- : 0)
-
- /* Return the ptrace ``address'' of register REGNO. */
-
- unsigned int
- register_addr (regno, blockend)
- int regno;
- int blockend;
- {
- return REGISTER_PTRACE_ADDR (regno);
- }
-
- #ifdef USE_PROC_FS
- #include <sys/procfs.h>
-
- /*
- * See the comment in m68k-tdep.c regarding the utility of these functions.
- */
-
- void
- supply_gregset (gregsetp)
- gregset_t *gregsetp;
- {
- register int regi;
- register long *regp = gregsetp->regs;
-
- for (regi = 0; regi < 31; regi++)
- supply_register (regi, (char *)(regp + regi));
-
- supply_register (PC_REGNUM, (char *)(regp + 31));
- }
-
- void
- fill_gregset (gregsetp, regno)
- gregset_t *gregsetp;
- int regno;
- {
- int regi;
- register long *regp = gregsetp->regs;
-
- for (regi = 0; regi < 31; regi++)
- if ((regno == -1) || (regno == regi))
- *(regp + regi) = *(long *) ®isters[REGISTER_BYTE (regi)];
-
- if ((regno == -1) || (regno == PC_REGNUM))
- *(regp + 31) = *(long *) ®isters[REGISTER_BYTE (PC_REGNUM)];
- }
-
- /*
- * Now we do the same thing for floating-point registers.
- * Again, see the comments in m68k-tdep.c.
- */
-
- void
- supply_fpregset (fpregsetp)
- fpregset_t *fpregsetp;
- {
- register int regi;
- register long *regp = fpregsetp->regs;
-
- for (regi = 0; regi < 32; regi++)
- supply_register (regi + FP0_REGNUM, (char *)(regp + regi));
- }
-
- void
- fill_fpregset (fpregsetp, regno)
- fpregset_t *fpregsetp;
- int regno;
- {
- int regi;
- register long *regp = fpregsetp->regs;
-
- for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
- {
- if ((regno == -1) || (regno == regi))
- {
- *(regp + regi - FP0_REGNUM) =
- *(long *) ®isters[REGISTER_BYTE (regi)];
- }
- }
- }
- #endif
-