1b71de8ea4
inferior_fp_registers by reading them from the inferior before modifying and writing them back. Fixes unexplainable inferior FP exceptions after calls to the inferior or setting of floating point registers. * mips-tdep.c (mips_skip_prologue): Skip move of argument register to register which is generated by gcc-2.4.
303 lines
9.9 KiB
C
303 lines
9.9 KiB
C
/* Functions specific to running gdb native on a Sun 4 running sunos4.
|
|
Copyright (C) 1989, 1992, 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 "target.h"
|
|
|
|
#include <signal.h>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/wait.h>
|
|
#include <machine/reg.h>
|
|
|
|
/* We don't store all registers immediately when requested, since they
|
|
get sent over in large chunks anyway. Instead, we accumulate most
|
|
of the changes and send them over once. "deferred_stores" keeps
|
|
track of which sets of registers we have locally-changed copies of,
|
|
so we only need send the groups that have changed. */
|
|
|
|
#define INT_REGS 1
|
|
#define STACK_REGS 2
|
|
#define FP_REGS 4
|
|
|
|
/* Fetch one or more registers from the inferior. REGNO == -1 to get
|
|
them all. We actually fetch more than requested, when convenient,
|
|
marking them as valid so we won't fetch them again. */
|
|
|
|
void
|
|
fetch_inferior_registers (regno)
|
|
int regno;
|
|
{
|
|
struct regs inferior_registers;
|
|
struct fp_status inferior_fp_registers;
|
|
int i;
|
|
|
|
/* We should never be called with deferred stores, because a prerequisite
|
|
for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh. */
|
|
if (deferred_stores) abort();
|
|
|
|
DO_DEFERRED_STORES;
|
|
|
|
/* Global and Out regs are fetched directly, as well as the control
|
|
registers. If we're getting one of the in or local regs,
|
|
and the stack pointer has not yet been fetched,
|
|
we have to do that first, since they're found in memory relative
|
|
to the stack pointer. */
|
|
if (regno < O7_REGNUM /* including -1 */
|
|
|| regno >= Y_REGNUM
|
|
|| (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
|
|
{
|
|
if (0 != ptrace (PTRACE_GETREGS, inferior_pid,
|
|
(PTRACE_ARG3_TYPE) &inferior_registers, 0))
|
|
perror("ptrace_getregs");
|
|
|
|
registers[REGISTER_BYTE (0)] = 0;
|
|
memcpy (®isters[REGISTER_BYTE (1)], &inferior_registers.r_g1,
|
|
15 * REGISTER_RAW_SIZE (G0_REGNUM));
|
|
*(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
|
|
*(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
|
|
*(int *)®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
|
|
*(int *)®isters[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
|
|
|
|
for (i = G0_REGNUM; i <= O7_REGNUM; i++)
|
|
register_valid[i] = 1;
|
|
register_valid[Y_REGNUM] = 1;
|
|
register_valid[PS_REGNUM] = 1;
|
|
register_valid[PC_REGNUM] = 1;
|
|
register_valid[NPC_REGNUM] = 1;
|
|
/* If we don't set these valid, read_register_bytes() rereads
|
|
all the regs every time it is called! FIXME. */
|
|
register_valid[WIM_REGNUM] = 1; /* Not true yet, FIXME */
|
|
register_valid[TBR_REGNUM] = 1; /* Not true yet, FIXME */
|
|
register_valid[FPS_REGNUM] = 1; /* Not true yet, FIXME */
|
|
register_valid[CPS_REGNUM] = 1; /* Not true yet, FIXME */
|
|
}
|
|
|
|
/* Floating point registers */
|
|
if (regno == -1 || (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
|
|
{
|
|
if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid,
|
|
(PTRACE_ARG3_TYPE) &inferior_fp_registers,
|
|
0))
|
|
perror("ptrace_getfpregs");
|
|
memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
|
|
sizeof inferior_fp_registers.fpu_fr);
|
|
/* bcopy (&inferior_fp_registers.Fpu_fsr,
|
|
®isters[REGISTER_BYTE (FPS_REGNUM)],
|
|
sizeof (FPU_FSR_TYPE)); FIXME??? -- gnu@cyg */
|
|
for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
|
|
register_valid[i] = 1;
|
|
register_valid[FPS_REGNUM] = 1;
|
|
}
|
|
|
|
/* These regs are saved on the stack by the kernel. Only read them
|
|
all (16 ptrace calls!) if we really need them. */
|
|
if (regno == -1)
|
|
{
|
|
target_xfer_memory (*(CORE_ADDR*)®isters[REGISTER_BYTE (SP_REGNUM)],
|
|
®isters[REGISTER_BYTE (L0_REGNUM)],
|
|
16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
|
|
for (i = L0_REGNUM; i <= I7_REGNUM; i++)
|
|
register_valid[i] = 1;
|
|
}
|
|
else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
|
|
{
|
|
CORE_ADDR sp = *(CORE_ADDR*)®isters[REGISTER_BYTE (SP_REGNUM)];
|
|
i = REGISTER_BYTE (regno);
|
|
if (register_valid[regno])
|
|
printf("register %d valid and read\n", regno);
|
|
target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
|
|
®isters[i], REGISTER_RAW_SIZE (regno), 0);
|
|
register_valid[regno] = 1;
|
|
}
|
|
}
|
|
|
|
/* 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 (regno)
|
|
int regno;
|
|
{
|
|
struct regs inferior_registers;
|
|
struct fp_status inferior_fp_registers;
|
|
int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
|
|
|
|
/* First decide which pieces of machine-state we need to modify.
|
|
Default for regno == -1 case is all pieces. */
|
|
if (regno >= 0)
|
|
if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
|
|
{
|
|
wanna_store = FP_REGS;
|
|
}
|
|
else
|
|
{
|
|
if (regno == SP_REGNUM)
|
|
wanna_store = INT_REGS + STACK_REGS;
|
|
else if (regno < L0_REGNUM || regno > I7_REGNUM)
|
|
wanna_store = INT_REGS;
|
|
else
|
|
wanna_store = STACK_REGS;
|
|
}
|
|
|
|
/* See if we're forcing the stores to happen now, or deferring. */
|
|
if (regno == -2)
|
|
{
|
|
wanna_store = deferred_stores;
|
|
deferred_stores = 0;
|
|
}
|
|
else
|
|
{
|
|
if (wanna_store == STACK_REGS)
|
|
{
|
|
/* Fall through and just store one stack reg. If we deferred
|
|
it, we'd have to store them all, or remember more info. */
|
|
}
|
|
else
|
|
{
|
|
deferred_stores |= wanna_store;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (wanna_store & STACK_REGS)
|
|
{
|
|
CORE_ADDR sp = *(CORE_ADDR *)®isters[REGISTER_BYTE (SP_REGNUM)];
|
|
|
|
if (regno < 0 || regno == SP_REGNUM)
|
|
{
|
|
if (!register_valid[L0_REGNUM+5]) abort();
|
|
target_xfer_memory (sp,
|
|
®isters[REGISTER_BYTE (L0_REGNUM)],
|
|
16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
|
|
}
|
|
else
|
|
{
|
|
if (!register_valid[regno]) abort();
|
|
target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
|
|
®isters[REGISTER_BYTE (regno)],
|
|
REGISTER_RAW_SIZE (regno), 1);
|
|
}
|
|
|
|
}
|
|
|
|
if (wanna_store & INT_REGS)
|
|
{
|
|
if (!register_valid[G1_REGNUM]) abort();
|
|
|
|
memcpy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (G1_REGNUM)],
|
|
15 * REGISTER_RAW_SIZE (G1_REGNUM));
|
|
|
|
inferior_registers.r_ps =
|
|
*(int *)®isters[REGISTER_BYTE (PS_REGNUM)];
|
|
inferior_registers.r_pc =
|
|
*(int *)®isters[REGISTER_BYTE (PC_REGNUM)];
|
|
inferior_registers.r_npc =
|
|
*(int *)®isters[REGISTER_BYTE (NPC_REGNUM)];
|
|
inferior_registers.r_y =
|
|
*(int *)®isters[REGISTER_BYTE (Y_REGNUM)];
|
|
|
|
if (0 != ptrace (PTRACE_SETREGS, inferior_pid,
|
|
(PTRACE_ARG3_TYPE) &inferior_registers, 0))
|
|
perror("ptrace_setregs");
|
|
}
|
|
|
|
if (wanna_store & FP_REGS)
|
|
{
|
|
if (!register_valid[FP0_REGNUM+9]) abort();
|
|
/* Initialize inferior_fp_registers members that gdb doesn't set
|
|
by reading them from the inferior. */
|
|
if (0 !=
|
|
ptrace (PTRACE_GETFPREGS, inferior_pid,
|
|
(PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
|
|
perror("ptrace_getfpregs");
|
|
memcpy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)],
|
|
sizeof inferior_fp_registers.fpu_fr);
|
|
|
|
/* memcpy (&inferior_fp_registers.Fpu_fsr,
|
|
®isters[REGISTER_BYTE (FPS_REGNUM)], sizeof (FPU_FSR_TYPE));
|
|
****/
|
|
if (0 !=
|
|
ptrace (PTRACE_SETFPREGS, inferior_pid,
|
|
(PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
|
|
perror("ptrace_setfpregs");
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
|
|
char *core_reg_sect;
|
|
unsigned core_reg_size;
|
|
int which;
|
|
unsigned int ignore; /* reg addr, unused in this version */
|
|
{
|
|
|
|
if (which == 0) {
|
|
|
|
/* Integer registers */
|
|
|
|
#define gregs ((struct regs *)core_reg_sect)
|
|
/* G0 *always* holds 0. */
|
|
*(int *)®isters[REGISTER_BYTE (0)] = 0;
|
|
|
|
/* The globals and output registers. */
|
|
memcpy (®isters[REGISTER_BYTE (G1_REGNUM)], &gregs->r_g1,
|
|
15 * REGISTER_RAW_SIZE (G1_REGNUM));
|
|
*(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
|
|
*(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
|
|
*(int *)®isters[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
|
|
*(int *)®isters[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
|
|
|
|
/* My best guess at where to get the locals and input
|
|
registers is exactly where they usually are, right above
|
|
the stack pointer. If the core dump was caused by a bus error
|
|
from blowing away the stack pointer (as is possible) then this
|
|
won't work, but it's worth the try. */
|
|
{
|
|
int sp;
|
|
|
|
sp = *(int *)®isters[REGISTER_BYTE (SP_REGNUM)];
|
|
if (0 != target_read_memory (sp, ®isters[REGISTER_BYTE (L0_REGNUM)],
|
|
16 * REGISTER_RAW_SIZE (L0_REGNUM)))
|
|
{
|
|
/* fprintf so user can still use gdb */
|
|
fprintf (stderr,
|
|
"Couldn't read input and local registers from core file\n");
|
|
}
|
|
}
|
|
} else if (which == 2) {
|
|
|
|
/* Floating point registers */
|
|
|
|
#define fpuregs ((struct fpu *) core_reg_sect)
|
|
if (core_reg_size >= sizeof (struct fpu))
|
|
{
|
|
memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], fpuregs->fpu_regs,
|
|
sizeof (fpuregs->fpu_regs));
|
|
memcpy (®isters[REGISTER_BYTE (FPS_REGNUM)], &fpuregs->fpu_fsr,
|
|
sizeof (FPU_FSR_TYPE));
|
|
}
|
|
else
|
|
fprintf (stderr, "Couldn't read float regs from core file\n");
|
|
}
|
|
}
|
|
|