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binutils-gdb/gdb/gdbserver/linux-ppc-low.c

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/* GNU/Linux/PowerPC specific low level interface, for the remote server for
GDB.
Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2007, 2008
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "linux-low.h"
#include <elf.h>
#include <asm/ptrace.h>
/* These are in <asm/cputable.h> in current kernels. */
#define PPC_FEATURE_HAS_VSX 0x00000080
#define PPC_FEATURE_HAS_ALTIVEC 0x10000000
#define PPC_FEATURE_HAS_SPE 0x00800000
static unsigned long ppc_hwcap;
/* Defined in auto-generated file powerpc-32l.c. */
void init_registers_powerpc_32l (void);
/* Defined in auto-generated file powerpc-altivec32l.c. */
void init_registers_powerpc_altivec32l (void);
/* Defined in auto-generated file powerpc-vsx32l.c. */
void init_registers_powerpc_vsx32l (void);
/* Defined in auto-generated file powerpc-e500l.c. */
void init_registers_powerpc_e500l (void);
/* Defined in auto-generated file powerpc-64l.c. */
void init_registers_powerpc_64l (void);
/* Defined in auto-generated file powerpc-altivec64l.c. */
void init_registers_powerpc_altivec64l (void);
/* Defined in auto-generated file powerpc-vsx64l.c. */
void init_registers_powerpc_vsx64l (void);
#define ppc_num_regs 73
/* This sometimes isn't defined. */
#ifndef PT_ORIG_R3
#define PT_ORIG_R3 34
#endif
#ifndef PT_TRAP
#define PT_TRAP 40
#endif
#ifdef __powerpc64__
/* We use a constant for FPSCR instead of PT_FPSCR, because
many shipped PPC64 kernels had the wrong value in ptrace.h. */
static int ppc_regmap[] =
{PT_R0 * 8, PT_R1 * 8, PT_R2 * 8, PT_R3 * 8,
PT_R4 * 8, PT_R5 * 8, PT_R6 * 8, PT_R7 * 8,
PT_R8 * 8, PT_R9 * 8, PT_R10 * 8, PT_R11 * 8,
PT_R12 * 8, PT_R13 * 8, PT_R14 * 8, PT_R15 * 8,
PT_R16 * 8, PT_R17 * 8, PT_R18 * 8, PT_R19 * 8,
PT_R20 * 8, PT_R21 * 8, PT_R22 * 8, PT_R23 * 8,
PT_R24 * 8, PT_R25 * 8, PT_R26 * 8, PT_R27 * 8,
PT_R28 * 8, PT_R29 * 8, PT_R30 * 8, PT_R31 * 8,
PT_FPR0*8, PT_FPR0*8 + 8, PT_FPR0*8+16, PT_FPR0*8+24,
PT_FPR0*8+32, PT_FPR0*8+40, PT_FPR0*8+48, PT_FPR0*8+56,
PT_FPR0*8+64, PT_FPR0*8+72, PT_FPR0*8+80, PT_FPR0*8+88,
PT_FPR0*8+96, PT_FPR0*8+104, PT_FPR0*8+112, PT_FPR0*8+120,
PT_FPR0*8+128, PT_FPR0*8+136, PT_FPR0*8+144, PT_FPR0*8+152,
PT_FPR0*8+160, PT_FPR0*8+168, PT_FPR0*8+176, PT_FPR0*8+184,
PT_FPR0*8+192, PT_FPR0*8+200, PT_FPR0*8+208, PT_FPR0*8+216,
PT_FPR0*8+224, PT_FPR0*8+232, PT_FPR0*8+240, PT_FPR0*8+248,
PT_NIP * 8, PT_MSR * 8, PT_CCR * 8, PT_LNK * 8,
PT_CTR * 8, PT_XER * 8, PT_FPR0*8 + 256,
PT_ORIG_R3 * 8, PT_TRAP * 8 };
#else
/* Currently, don't check/send MQ. */
static int ppc_regmap[] =
{PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4,
PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4,
PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4,
PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4,
PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4,
PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4,
PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4,
PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4,
PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24,
PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56,
PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88,
PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120,
PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152,
PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184,
PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216,
PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248,
PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4,
PT_CTR * 4, PT_XER * 4, PT_FPSCR * 4,
PT_ORIG_R3 * 4, PT_TRAP * 4
};
static int ppc_regmap_e500[] =
{PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4,
PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4,
PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4,
PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4,
PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4,
PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4,
PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4,
PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
-1, -1, -1, -1,
PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4,
PT_CTR * 4, PT_XER * 4, -1,
PT_ORIG_R3 * 4, PT_TRAP * 4
};
#endif
static int
ppc_cannot_store_register (int regno)
{
#ifndef __powerpc64__
/* Some kernels do not allow us to store fpscr. */
if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE) && regno == find_regno ("fpscr"))
return 2;
#endif
/* Some kernels do not allow us to store orig_r3 or trap. */
if (regno == find_regno ("orig_r3")
|| regno == find_regno ("trap"))
return 2;
return 0;
}
static int
ppc_cannot_fetch_register (int regno)
{
return 0;
}
static void
ppc_collect_ptrace_register (int regno, char *buf)
{
int size = register_size (regno);
memset (buf, 0, sizeof (long));
if (size < sizeof (long))
collect_register (regno, buf + sizeof (long) - size);
else
collect_register (regno, buf);
}
static void
ppc_supply_ptrace_register (int regno, const char *buf)
{
int size = register_size (regno);
if (size < sizeof (long))
supply_register (regno, buf + sizeof (long) - size);
else
supply_register (regno, buf);
}
static CORE_ADDR
ppc_get_pc (void)
{
if (register_size (0) == 4)
{
unsigned int pc;
collect_register_by_name ("pc", &pc);
return (CORE_ADDR) pc;
}
else
{
unsigned long pc;
collect_register_by_name ("pc", &pc);
return (CORE_ADDR) pc;
}
}
static void
ppc_set_pc (CORE_ADDR pc)
{
if (register_size (0) == 4)
{
unsigned int newpc = pc;
supply_register_by_name ("pc", &newpc);
}
else
{
unsigned long newpc = pc;
supply_register_by_name ("pc", &newpc);
}
}
static int
ppc_get_hwcap (unsigned long *valp)
{
int wordsize = register_size (0);
unsigned char *data = alloca (2 * wordsize);
int offset = 0;
while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
{
if (wordsize == 4)
{
unsigned int *data_p = (unsigned int *)data;
if (data_p[0] == AT_HWCAP)
{
*valp = data_p[1];
return 1;
}
}
else
{
unsigned long *data_p = (unsigned long *)data;
if (data_p[0] == AT_HWCAP)
{
*valp = data_p[1];
return 1;
}
}
offset += 2 * wordsize;
}
*valp = 0;
return 0;
}
static void
ppc_arch_setup (void)
{
#ifdef __powerpc64__
long msr;
/* On a 64-bit host, assume 64-bit inferior process with no
AltiVec registers. Reset ppc_hwcap to ensure that the
collect_register call below does not fail. */
init_registers_powerpc_64l ();
ppc_hwcap = 0;
/* Only if the high bit of the MSR is set, we actually have
a 64-bit inferior. */
collect_register_by_name ("msr", &msr);
if (msr < 0)
{
ppc_get_hwcap (&ppc_hwcap);
if (ppc_hwcap & PPC_FEATURE_HAS_VSX)
init_registers_powerpc_vsx64l ();
else if (ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC)
init_registers_powerpc_altivec64l ();
return;
}
#endif
/* OK, we have a 32-bit inferior. */
init_registers_powerpc_32l ();
ppc_get_hwcap (&ppc_hwcap);
if (ppc_hwcap & PPC_FEATURE_HAS_VSX)
init_registers_powerpc_vsx32l ();
else if (ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC)
init_registers_powerpc_altivec32l ();
/* On 32-bit machines, check for SPE registers.
Set the low target's regmap field as appropriately. */
#ifndef __powerpc64__
the_low_target.regmap = ppc_regmap;
if (ppc_hwcap & PPC_FEATURE_HAS_SPE)
{
init_registers_powerpc_e500l ();
the_low_target.regmap = ppc_regmap_e500;
}
#endif
}
/* Correct in either endianness.
This instruction is "twge r2, r2", which GDB uses as a software
breakpoint. */
static const unsigned int ppc_breakpoint = 0x7d821008;
#define ppc_breakpoint_len 4
static int
ppc_breakpoint_at (CORE_ADDR where)
{
unsigned int insn;
(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
if (insn == ppc_breakpoint)
return 1;
/* If necessary, recognize more trap instructions here. GDB only uses the
one. */
return 0;
}
/* Provide only a fill function for the general register set. ps_lgetregs
will use this for NPTL support. */
static void ppc_fill_gregset (void *buf)
{
int i;
for (i = 0; i < 32; i++)
ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);
for (i = 64; i < 70; i++)
ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);
for (i = 71; i < 73; i++)
ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);
}
#ifndef PTRACE_GETVSXREGS
#define PTRACE_GETVSXREGS 27
#define PTRACE_SETVSXREGS 28
#endif
#define SIZEOF_VSXREGS 32*8
static void
ppc_fill_vsxregset (void *buf)
{
int i, base;
char *regset = buf;
if (!(ppc_hwcap & PPC_FEATURE_HAS_VSX))
return;
base = find_regno ("vs0h");
for (i = 0; i < 32; i++)
collect_register (base + i, &regset[i * 8]);
}
static void
ppc_store_vsxregset (const void *buf)
{
int i, base;
const char *regset = buf;
if (!(ppc_hwcap & PPC_FEATURE_HAS_VSX))
return;
base = find_regno ("vs0h");
for (i = 0; i < 32; i++)
supply_register (base + i, &regset[i * 8]);
}
#ifndef PTRACE_GETVRREGS
#define PTRACE_GETVRREGS 18
#define PTRACE_SETVRREGS 19
#endif
#define SIZEOF_VRREGS 33*16+4
static void
ppc_fill_vrregset (void *buf)
{
int i, base;
char *regset = buf;
if (!(ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC))
return;
base = find_regno ("vr0");
for (i = 0; i < 32; i++)
collect_register (base + i, &regset[i * 16]);
collect_register_by_name ("vscr", &regset[32 * 16 + 12]);
collect_register_by_name ("vrsave", &regset[33 * 16]);
}
static void
ppc_store_vrregset (const void *buf)
{
int i, base;
const char *regset = buf;
if (!(ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC))
return;
base = find_regno ("vr0");
for (i = 0; i < 32; i++)
supply_register (base + i, &regset[i * 16]);
supply_register_by_name ("vscr", &regset[32 * 16 + 12]);
supply_register_by_name ("vrsave", &regset[33 * 16]);
}
#ifndef PTRACE_GETEVRREGS
#define PTRACE_GETEVRREGS 20
#define PTRACE_SETEVRREGS 21
#endif
struct gdb_evrregset_t
{
unsigned long evr[32];
unsigned long long acc;
unsigned long spefscr;
};
static void
ppc_fill_evrregset (void *buf)
{
int i, ev0;
struct gdb_evrregset_t *regset = buf;
if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE))
return;
ev0 = find_regno ("ev0h");
for (i = 0; i < 32; i++)
collect_register (ev0 + i, &regset->evr[i]);
collect_register_by_name ("acc", &regset->acc);
collect_register_by_name ("spefscr", &regset->spefscr);
}
static void
ppc_store_evrregset (const void *buf)
{
int i, ev0;
const struct gdb_evrregset_t *regset = buf;
if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE))
return;
ev0 = find_regno ("ev0h");
for (i = 0; i < 32; i++)
supply_register (ev0 + i, &regset->evr[i]);
supply_register_by_name ("acc", &regset->acc);
supply_register_by_name ("spefscr", &regset->spefscr);
}
struct regset_info target_regsets[] = {
/* List the extra register sets before GENERAL_REGS. That way we will
fetch them every time, but still fall back to PTRACE_PEEKUSER for the
general registers. Some kernels support these, but not the newer
PPC_PTRACE_GETREGS. */
{ PTRACE_GETVSXREGS, PTRACE_SETVSXREGS, SIZEOF_VSXREGS, EXTENDED_REGS,
ppc_fill_vsxregset, ppc_store_vsxregset },
{ PTRACE_GETVRREGS, PTRACE_SETVRREGS, SIZEOF_VRREGS, EXTENDED_REGS,
ppc_fill_vrregset, ppc_store_vrregset },
{ PTRACE_GETEVRREGS, PTRACE_SETEVRREGS, 32 * 4 + 8 + 4, EXTENDED_REGS,
ppc_fill_evrregset, ppc_store_evrregset },
{ 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL },
{ 0, 0, -1, -1, NULL, NULL }
};
struct linux_target_ops the_low_target = {
ppc_arch_setup,
ppc_num_regs,
ppc_regmap,
ppc_cannot_fetch_register,
ppc_cannot_store_register,
ppc_get_pc,
ppc_set_pc,
(const unsigned char *) &ppc_breakpoint,
ppc_breakpoint_len,
NULL,
0,
ppc_breakpoint_at,
NULL,
NULL,
NULL,
NULL,
ppc_collect_ptrace_register,
ppc_supply_ptrace_register,
};
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