238 lines
6.6 KiB
C
238 lines
6.6 KiB
C
/* Low level DECstation interface to ptrace, for GDB when running native.
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Copyright 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
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Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
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and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
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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., 675 Mass Ave, Cambridge, MA 02139, 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 <sys/ptrace.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#undef JB_S0
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#undef JB_S1
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#undef JB_S2
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#undef JB_S3
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#undef JB_S4
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#undef JB_S5
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#undef JB_S6
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#undef JB_S7
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#undef JB_SP
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#undef JB_S8
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#undef JB_PC
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#undef JB_SR
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#undef NJBREGS
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#include <setjmp.h> /* For JB_XXX. */
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/* Size of elements in jmpbuf */
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#define JB_ELEMENT_SIZE 4
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/* Map gdb internal register number to ptrace ``address''.
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These ``addresses'' are defined in DECstation <sys/ptrace.h> */
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#define REGISTER_PTRACE_ADDR(regno) \
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(regno < 32 ? GPR_BASE + regno \
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: regno == PC_REGNUM ? PC \
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: regno == CAUSE_REGNUM ? CAUSE \
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: regno == HI_REGNUM ? MMHI \
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: regno == LO_REGNUM ? MMLO \
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: regno == FCRCS_REGNUM ? FPC_CSR \
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: regno == FCRIR_REGNUM ? FPC_EIR \
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: regno >= FP0_REGNUM ? FPR_BASE + (regno - FP0_REGNUM) \
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: 0)
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static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
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/* Get all registers from the inferior */
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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register unsigned int regaddr;
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char buf[MAX_REGISTER_RAW_SIZE];
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register int i;
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registers_fetched ();
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for (regno = 1; regno < NUM_REGS; regno++)
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{
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regaddr = REGISTER_PTRACE_ADDR (regno);
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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{
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*(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid,
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(PTRACE_ARG3_TYPE) regaddr, 0);
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regaddr += sizeof (int);
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}
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supply_register (regno, buf);
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}
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supply_register (ZERO_REGNUM, zerobuf);
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/* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
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supply_register (FP_REGNUM, zerobuf);
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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void
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store_inferior_registers (regno)
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int regno;
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{
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register unsigned int regaddr;
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char buf[80];
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if (regno == 0)
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return;
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if (regno > 0)
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{
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regaddr = REGISTER_PTRACE_ADDR (regno);
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errno = 0;
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ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
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read_register (regno));
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if (errno != 0)
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{
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sprintf (buf, "writing register number %d", regno);
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perror_with_name (buf);
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}
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}
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else
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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if (regno == ZERO_REGNUM || regno == PS_REGNUM
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|| regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM
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|| regno == FCRIR_REGNUM || regno == FP_REGNUM
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|| (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))
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continue;
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regaddr = REGISTER_PTRACE_ADDR (regno);
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errno = 0;
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ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
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read_register (regno));
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if (errno != 0)
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{
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sprintf (buf, "writing all regs, number %d", regno);
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perror_with_name (buf);
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}
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}
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}
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}
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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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jb_addr = read_register(A0_REGNUM);
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if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, pc,
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sizeof(CORE_ADDR)))
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return 0;
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SWAP_TARGET_AND_HOST(pc, 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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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 unsigned int addr;
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int bad_reg = -1;
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register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */
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/* If u.u_ar0 was an absolute address in the core file, relativize it now,
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so we can use it as an offset into core_reg_sect. When we're done,
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"register 0" will be at core_reg_sect+reg_ptr, and we can use
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register_addr to offset to the other registers. If this is a modern
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core file without a upage, reg_ptr will be zero and this is all a big
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NOP. */
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if (reg_ptr > core_reg_size)
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#ifdef KERNEL_U_ADDR
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reg_ptr -= KERNEL_U_ADDR;
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#else
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error ("Old mips core file can't be processed on this machine.");
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#endif
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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addr = register_addr (regno, reg_ptr);
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if (addr >= core_reg_size) {
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if (bad_reg < 0)
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bad_reg = regno;
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} else {
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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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supply_register (ZERO_REGNUM, zerobuf);
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/* Frame ptr reg must appear to be 0; it is faked by stack handling code. */
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supply_register (FP_REGNUM, zerobuf);
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}
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/* Return the address in the core dump or inferior of register REGNO.
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BLOCKEND is the address of the end of the user structure. */
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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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int addr;
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if (regno < 0 || regno >= NUM_REGS)
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error ("Invalid register number %d.", regno);
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REGISTER_U_ADDR (addr, blockend, regno);
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return addr;
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}
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