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binutils-gdb/gdb/gdbserver/linux-s390-low.c

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/* GNU/Linux S/390 specific low level interface, for the remote server
for GDB.
Copyright (C) 2001-2014 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/>. */
/* This file is used for both 31-bit and 64-bit S/390 systems. */
#include "server.h"
#include "linux-low.h"
#include "elf/common.h"
#include <asm/ptrace.h>
#include <sys/ptrace.h>
#include <sys/uio.h>
#include <elf.h>
#ifndef HWCAP_S390_HIGH_GPRS
#define HWCAP_S390_HIGH_GPRS 512
#endif
#ifndef HWCAP_S390_TE
#define HWCAP_S390_TE 1024
#endif
#ifndef PTRACE_GETREGSET
#define PTRACE_GETREGSET 0x4204
#endif
#ifndef PTRACE_SETREGSET
#define PTRACE_SETREGSET 0x4205
#endif
/* Defined in auto-generated file s390-linux32.c. */
void init_registers_s390_linux32 (void);
extern const struct target_desc *tdesc_s390_linux32;
/* Defined in auto-generated file s390-linux32v1.c. */
void init_registers_s390_linux32v1 (void);
extern const struct target_desc *tdesc_s390_linux32v1;
/* Defined in auto-generated file s390-linux32v2.c. */
void init_registers_s390_linux32v2 (void);
extern const struct target_desc *tdesc_s390_linux32v2;
/* Defined in auto-generated file s390-linux64.c. */
void init_registers_s390_linux64 (void);
extern const struct target_desc *tdesc_s390_linux64;
/* Defined in auto-generated file s390-linux64v1.c. */
void init_registers_s390_linux64v1 (void);
extern const struct target_desc *tdesc_s390_linux64v1;
/* Defined in auto-generated file s390-linux64v2.c. */
void init_registers_s390_linux64v2 (void);
extern const struct target_desc *tdesc_s390_linux64v2;
/* Defined in auto-generated file s390-te-linux64.c. */
void init_registers_s390_te_linux64 (void);
extern const struct target_desc *tdesc_s390_te_linux64;
/* Defined in auto-generated file s390x-linux64.c. */
void init_registers_s390x_linux64 (void);
extern const struct target_desc *tdesc_s390x_linux64;
/* Defined in auto-generated file s390x-linux64v1.c. */
void init_registers_s390x_linux64v1 (void);
extern const struct target_desc *tdesc_s390x_linux64v1;
/* Defined in auto-generated file s390x-linux64v2.c. */
void init_registers_s390x_linux64v2 (void);
extern const struct target_desc *tdesc_s390x_linux64v2;
/* Defined in auto-generated file s390x-te-linux64.c. */
void init_registers_s390x_te_linux64 (void);
extern const struct target_desc *tdesc_s390x_te_linux64;
#define s390_num_regs 52
static int s390_regmap[] = {
PT_PSWMASK, PT_PSWADDR,
PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
PT_FPC,
#ifndef __s390x__
PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
#else
PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
#endif
PT_ORIGGPR2,
};
#ifdef __s390x__
#define s390_num_regs_3264 68
static int s390_regmap_3264[] = {
PT_PSWMASK, PT_PSWADDR,
PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1,
PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5,
PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9,
PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13,
PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
PT_FPC,
PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
PT_ORIGGPR2,
};
#endif
static int
s390_cannot_fetch_register (int regno)
{
return 0;
}
static int
s390_cannot_store_register (int regno)
{
return 0;
}
static void
s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
{
int size = register_size (regcache->tdesc, regno);
if (size < sizeof (long))
{
const struct regs_info *regs_info = (*the_low_target.regs_info) ();
struct usrregs_info *usr = regs_info->usrregs;
int regaddr = usr->regmap[regno];
memset (buf, 0, sizeof (long));
if ((regno ^ 1) < usr->num_regs
&& usr->regmap[regno ^ 1] == regaddr)
{
collect_register (regcache, regno & ~1, buf);
collect_register (regcache, (regno & ~1) + 1,
buf + sizeof (long) - size);
}
else if (regaddr == PT_PSWMASK)
{
/* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying
the basic addressing mode bit from the PSW address. */
char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
collect_register (regcache, regno, buf);
collect_register (regcache, regno ^ 1, addr);
buf[1] &= ~0x8;
buf[size] |= (addr[0] & 0x80);
}
else if (regaddr == PT_PSWADDR)
{
/* Convert 4-byte PSW address to 8 bytes by clearing the addressing
mode bit (which gets copied to the PSW mask instead). */
collect_register (regcache, regno, buf + sizeof (long) - size);
buf[sizeof (long) - size] &= ~0x80;
}
else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
|| regaddr == PT_ORIGGPR2)
collect_register (regcache, regno, buf + sizeof (long) - size);
else
collect_register (regcache, regno, buf);
}
else
collect_register (regcache, regno, buf);
}
static void
s390_supply_ptrace_register (struct regcache *regcache,
int regno, const char *buf)
{
int size = register_size (regcache->tdesc, regno);
if (size < sizeof (long))
{
const struct regs_info *regs_info = (*the_low_target.regs_info) ();
struct usrregs_info *usr = regs_info->usrregs;
int regaddr = usr->regmap[regno];
if ((regno ^ 1) < usr->num_regs
&& usr->regmap[regno ^ 1] == regaddr)
{
supply_register (regcache, regno & ~1, buf);
supply_register (regcache, (regno & ~1) + 1,
buf + sizeof (long) - size);
}
else if (regaddr == PT_PSWMASK)
{
/* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying
the basic addressing mode into the PSW address. */
char *mask = alloca (size);
char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
memcpy (mask, buf, size);
mask[1] |= 0x8;
supply_register (regcache, regno, mask);
collect_register (regcache, regno ^ 1, addr);
addr[0] &= ~0x80;
addr[0] |= (buf[size] & 0x80);
supply_register (regcache, regno ^ 1, addr);
}
else if (regaddr == PT_PSWADDR)
{
/* Convert 8-byte PSW address to 4 bytes by truncating, but
keeping the addressing mode bit (which was set from the mask). */
char *addr = alloca (size);
char amode;
collect_register (regcache, regno, addr);
amode = addr[0] & 0x80;
memcpy (addr, buf + sizeof (long) - size, size);
addr[0] &= ~0x80;
addr[0] |= amode;
supply_register (regcache, regno, addr);
}
else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
|| regaddr == PT_ORIGGPR2)
supply_register (regcache, regno, buf + sizeof (long) - size);
else
supply_register (regcache, regno, buf);
}
else
supply_register (regcache, regno, buf);
}
/* Provide only a fill function for the general register set. ps_lgetregs
will use this for NPTL support. */
static void
s390_fill_gregset (struct regcache *regcache, void *buf)
{
int i;
const struct regs_info *regs_info = (*the_low_target.regs_info) ();
struct usrregs_info *usr = regs_info->usrregs;
for (i = 0; i < usr->num_regs; i++)
{
if (usr->regmap[i] < PT_PSWMASK
|| usr->regmap[i] > PT_ACR15)
continue;
s390_collect_ptrace_register (regcache, i,
(char *) buf + usr->regmap[i]);
}
}
/* Fill and store functions for extended register sets. */
static void
s390_fill_last_break (struct regcache *regcache, void *buf)
{
/* Last break address is read-only. */
}
static void
s390_store_last_break (struct regcache *regcache, const void *buf)
{
const char *p;
p = (const char *) buf + 8 - register_size (regcache->tdesc, 0);
supply_register_by_name (regcache, "last_break", p);
}
static void
s390_fill_system_call (struct regcache *regcache, void *buf)
{
collect_register_by_name (regcache, "system_call", buf);
}
static void
s390_store_system_call (struct regcache *regcache, const void *buf)
{
supply_register_by_name (regcache, "system_call", buf);
}
static struct regset_info s390_regsets[] = {
{ 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
/* Last break address is read-only; do not attempt PTRACE_SETREGSET. */
{ PTRACE_GETREGSET, PTRACE_GETREGSET, NT_S390_LAST_BREAK, 0,
EXTENDED_REGS, s390_fill_last_break, s390_store_last_break },
{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
{ 0, 0, 0, -1, -1, NULL, NULL }
};
static const unsigned char s390_breakpoint[] = { 0, 1 };
#define s390_breakpoint_len 2
static CORE_ADDR
s390_get_pc (struct regcache *regcache)
{
if (register_size (regcache->tdesc, 0) == 4)
{
unsigned int pswa;
collect_register_by_name (regcache, "pswa", &pswa);
return pswa & 0x7fffffff;
}
else
{
unsigned long pc;
collect_register_by_name (regcache, "pswa", &pc);
return pc;
}
}
static void
s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
{
if (register_size (regcache->tdesc, 0) == 4)
{
unsigned int pswa;
collect_register_by_name (regcache, "pswa", &pswa);
pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff);
supply_register_by_name (regcache, "pswa", &pswa);
}
else
{
unsigned long pc = newpc;
supply_register_by_name (regcache, "pswa", &pc);
}
}
#ifdef __s390x__
static unsigned long
s390_get_hwcap (const struct target_desc *tdesc)
{
int wordsize = register_size (tdesc, 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)
return data_p[1];
}
else
{
unsigned long *data_p = (unsigned long *)data;
if (data_p[0] == AT_HWCAP)
return data_p[1];
}
offset += 2 * wordsize;
}
return 0;
}
#endif
static int
s390_check_regset (int pid, int regset, int regsize)
{
gdb_byte *buf = alloca (regsize);
struct iovec iov;
iov.iov_base = buf;
iov.iov_len = regsize;
if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) >= 0
|| errno == ENODATA)
return 1;
return 0;
}
#ifdef __s390x__
/* For a 31-bit inferior, whether the kernel supports using the full
64-bit GPRs. */
static int have_hwcap_s390_high_gprs = 0;
#endif
static void
s390_arch_setup (void)
{
const struct target_desc *tdesc;
struct regset_info *regset;
/* Check whether the kernel supports extra register sets. */
int pid = pid_of (current_inferior);
int have_regset_last_break
= s390_check_regset (pid, NT_S390_LAST_BREAK, 8);
int have_regset_system_call
= s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4);
int have_regset_tdb = s390_check_regset (pid, NT_S390_TDB, 256);
/* Assume 31-bit inferior process. */
if (have_regset_system_call)
tdesc = tdesc_s390_linux32v2;
else if (have_regset_last_break)
tdesc = tdesc_s390_linux32v1;
else
tdesc = tdesc_s390_linux32;
/* On a 64-bit host, check the low bit of the (31-bit) PSWM
-- if this is one, we actually have a 64-bit inferior. */
#ifdef __s390x__
{
unsigned int pswm;
struct regcache *regcache = new_register_cache (tdesc);
fetch_inferior_registers (regcache, find_regno (tdesc, "pswm"));
collect_register_by_name (regcache, "pswm", &pswm);
free_register_cache (regcache);
if (pswm & 1)
{
if (have_regset_tdb)
have_regset_tdb =
(s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_TE) != 0;
if (have_regset_tdb)
tdesc = tdesc_s390x_te_linux64;
else if (have_regset_system_call)
tdesc = tdesc_s390x_linux64v2;
else if (have_regset_last_break)
tdesc = tdesc_s390x_linux64v1;
else
tdesc = tdesc_s390x_linux64;
}
/* For a 31-bit inferior, check whether the kernel supports
using the full 64-bit GPRs. */
else if (s390_get_hwcap (tdesc) & HWCAP_S390_HIGH_GPRS)
{
have_hwcap_s390_high_gprs = 1;
if (have_regset_tdb)
have_regset_tdb = (s390_get_hwcap (tdesc) & HWCAP_S390_TE) != 0;
if (have_regset_tdb)
tdesc = tdesc_s390_te_linux64;
else if (have_regset_system_call)
tdesc = tdesc_s390_linux64v2;
else if (have_regset_last_break)
tdesc = tdesc_s390_linux64v1;
else
tdesc = tdesc_s390_linux64;
}
}
#endif
/* Update target_regsets according to available register sets. */
for (regset = s390_regsets; regset->fill_function != NULL; regset++)
if (regset->get_request == PTRACE_GETREGSET)
switch (regset->nt_type)
{
case NT_S390_LAST_BREAK:
regset->size = have_regset_last_break? 8 : 0;
break;
case NT_S390_SYSTEM_CALL:
regset->size = have_regset_system_call? 4 : 0;
break;
case NT_S390_TDB:
regset->size = have_regset_tdb ? 256 : 0;
default:
break;
}
current_process ()->tdesc = tdesc;
}
static int
s390_breakpoint_at (CORE_ADDR pc)
{
unsigned char c[s390_breakpoint_len];
read_inferior_memory (pc, c, s390_breakpoint_len);
return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
}
static struct usrregs_info s390_usrregs_info =
{
s390_num_regs,
s390_regmap,
};
static struct regsets_info s390_regsets_info =
{
s390_regsets, /* regsets */
0, /* num_regsets */
NULL, /* disabled_regsets */
};
static struct regs_info regs_info =
{
NULL, /* regset_bitmap */
&s390_usrregs_info,
&s390_regsets_info
};
#ifdef __s390x__
static struct usrregs_info s390_usrregs_info_3264 =
{
s390_num_regs_3264,
s390_regmap_3264
};
static struct regsets_info s390_regsets_info_3264 =
{
s390_regsets, /* regsets */
0, /* num_regsets */
NULL, /* disabled_regsets */
};
static struct regs_info regs_info_3264 =
{
NULL, /* regset_bitmap */
&s390_usrregs_info_3264,
&s390_regsets_info_3264
};
#endif
static const struct regs_info *
s390_regs_info (void)
{
#ifdef __s390x__
if (have_hwcap_s390_high_gprs)
{
const struct target_desc *tdesc = current_process ()->tdesc;
if (register_size (tdesc, 0) == 4)
return &regs_info_3264;
}
#endif
return &regs_info;
}
struct linux_target_ops the_low_target = {
s390_arch_setup,
s390_regs_info,
s390_cannot_fetch_register,
s390_cannot_store_register,
NULL, /* fetch_register */
s390_get_pc,
s390_set_pc,
s390_breakpoint,
s390_breakpoint_len,
NULL,
s390_breakpoint_len,
s390_breakpoint_at,
NULL,
NULL,
NULL,
NULL,
s390_collect_ptrace_register,
s390_supply_ptrace_register,
};
void
initialize_low_arch (void)
{
/* Initialize the Linux target descriptions. */
init_registers_s390_linux32 ();
init_registers_s390_linux32v1 ();
init_registers_s390_linux32v2 ();
init_registers_s390_linux64 ();
init_registers_s390_linux64v1 ();
init_registers_s390_linux64v2 ();
init_registers_s390_te_linux64 ();
init_registers_s390x_linux64 ();
init_registers_s390x_linux64v1 ();
init_registers_s390x_linux64v2 ();
init_registers_s390x_te_linux64 ();
initialize_regsets_info (&s390_regsets_info);
#ifdef __s390x__
initialize_regsets_info (&s390_regsets_info_3264);
#endif
}
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