347 lines
8.7 KiB
C
347 lines
8.7 KiB
C
/* Low level Alpha interface, for GDB when running native.
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Copyright 1993, 1995 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., 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 "target.h"
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#include <sys/ptrace.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/proc.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include <string.h>
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static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
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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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#define oi(name) \
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offsetof(struct md_coredump, md_tf.tf_regs[__CONCAT(FRAME_,name)])
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#define of(num) \
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offsetof(struct md_coredump, md_fpstate.fpr_regs[num])
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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 int addr;
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int bad_reg = -1;
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int regoff[NUM_REGS] = {
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oi(V0), oi(T0), oi(T1), oi(T2), oi(T3), oi(T4), oi(T5), oi(T6),
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oi(T7), oi(S0), oi(S1), oi(S2), oi(S3), oi(S4), oi(S5), oi(S6),
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oi(A0), oi(A1), oi(A2), oi(A3), oi(A4), oi(A5), oi(T8), oi(T9),
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oi(T10), oi(T11), oi(RA), oi(T12), oi(AT), oi(GP), oi(SP), -1,
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of(0), of(1), of(2), of(3), of(4), of(5), of(6), of(7),
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of(8), of(9), of(10), of(11), of(12), of(13), of(14), of(15),
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of(16), of(17), of(18), of(19), of(20), of(21), of(22), of(23),
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of(24), of(25), of(26), of(27), of(28), of(29), of(30), of(31),
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oi(PC), -1,
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};
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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 = regoff[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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register_t
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rrf_to_register(regno, reg, fpreg)
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int regno;
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struct reg *reg;
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struct fpreg *fpreg;
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{
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if (regno < 0)
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abort();
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else if (regno < FP0_REGNUM)
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return (reg->r_regs[regno]);
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else if (regno == PC_REGNUM)
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return (reg->r_regs[R_ZERO]);
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else if (regno >= FP0_REGNUM)
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return (fpreg->fpr_regs[regno - FP0_REGNUM]);
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else
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abort();
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}
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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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struct reg reg;
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struct fpreg fpreg;
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register_t regval;
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char *rp;
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ptrace(PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE)®, 0);
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ptrace(PT_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE)&fpreg, 0);
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if (regno < 0) {
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for (regno = 0; regno < NUM_REGS; regno++) {
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if (CANNOT_FETCH_REGISTER (regno))
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rp = zerobuf;
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else {
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regval = rrf_to_register(regno, ®, &fpreg);
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rp = (char *)®val;
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}
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supply_register(regno, rp);
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}
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} else {
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if (CANNOT_FETCH_REGISTER (regno))
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rp = zerobuf;
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else {
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regval = rrf_to_register(regno, ®, &fpreg);
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rp = (char *)®val;
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}
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supply_register(regno, rp);
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}
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}
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void
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register_into_rrf(val, regno, reg, fpreg)
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register_t val;
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int regno;
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struct reg *reg;
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struct fpreg *fpreg;
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{
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if (regno < 0)
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abort();
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else if (regno < FP0_REGNUM)
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reg->r_regs[regno] = val;
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else if (regno == PC_REGNUM)
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reg->r_regs[R_ZERO] = val;
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else if (regno >= FP0_REGNUM)
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fpreg->fpr_regs[regno - FP0_REGNUM] = val;
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else
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abort();
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}
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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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struct reg reg;
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struct fpreg fpreg;
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register_t regval;
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if (regno < 0) {
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for (regno = 0; regno < NUM_REGS; regno++) {
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if (CANNOT_STORE_REGISTER (regno))
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continue;
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if (REGISTER_RAW_SIZE (regno) != sizeof regval)
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abort();
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memcpy(®val, ®isters[REGISTER_BYTE (regno)],
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REGISTER_RAW_SIZE (regno));
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register_into_rrf(regval, regno, ®, &fpreg);
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}
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} else {
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ptrace(PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE)®, 0);
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ptrace(PT_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE)&fpreg, 0);
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memcpy(®val, ®isters[REGISTER_BYTE (regno)],
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REGISTER_RAW_SIZE (regno));
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register_into_rrf(regval, regno, ®, &fpreg);
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}
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ptrace(PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE)®, 0);
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ptrace(PT_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE)&fpreg, 0);
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}
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void
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child_resume (pid, step, signal)
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int pid;
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int step;
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enum target_signal signal;
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{
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errno = 0;
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if (pid == -1)
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/* Resume all threads. */
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/* I think this only gets used in the non-threaded case, where "resume
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all threads" and "resume inferior_pid" are the same. */
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pid = inferior_pid;
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/* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
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it was. (If GDB wanted it to start some other way, we have already
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written a new PC value to the child.)
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If this system does not support PT_STEP, a higher level function will
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have called single_step() to transmute the step request into a
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continue request (by setting breakpoints on all possible successor
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instructions), so we don't have to worry about that here. */
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if (step)
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abort();
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else
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ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1,
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target_signal_to_host (signal));
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if (errno)
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perror_with_name ("ptrace");
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}
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/*
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* kernel_u_size() is not helpful on NetBSD because
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* the "u" struct is NOT in the core dump file.
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*/
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#ifdef FETCH_KCORE_REGISTERS
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/*
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* Get registers from a kernel crash dump or live kernel.
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* Called by kcore-nbsd.c:get_kcore_registers().
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*/
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fetch_kcore_registers (pcbp)
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struct pcb *pcbp;
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{
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int regno;
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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switch (regno)
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{
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case SP_REGNUM:
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supply_register (regno, (char *)&pcbp->pcb_hw.apcb_ksp);
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break;
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case PC_REGNUM:
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supply_register (regno, (char *)&pcbp->pcb_context[7]);
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break;
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case S0_REGNUM:
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case S0_REGNUM+1:
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case S0_REGNUM+2:
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case S0_REGNUM+3:
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case S0_REGNUM+4:
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case S0_REGNUM+5:
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case S0_REGNUM+6:
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supply_register (regno,
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(char *)&pcbp->pcb_context[regno - S0_REGNUM]);
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break;
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default:
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supply_register (regno, zerobuf);
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break;
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}
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}
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}
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#endif /* FETCH_KCORE_REGISTERS */
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void
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clear_regs()
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{
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int regno;
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for (regno = 0; regno < NUM_REGS; regno++)
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supply_register(regno, zerobuf);
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}
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static struct core_fns alphanbsd_core_fns =
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{
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bfd_target_ecoff_flavour,
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fetch_core_registers,
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NULL
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};
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static struct core_fns alphanbsd_elf_core_fns =
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{
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bfd_target_elf_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_alphanbsd ()
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{
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add_core_fns (&alphanbsd_core_fns);
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add_core_fns (&alphanbsd_elf_core_fns);
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}
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