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s390-linux-tdep.c
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/* Target-dependent code for GDB, the GNU debugger.
Copyright (C) 2001-2015 Free Software Foundation, Inc.
Contributed by D.J. Barrow ([email protected],[email protected])
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
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 "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "inferior.h"
#include "infrun.h"
#include "symtab.h"
#include "target.h"
#include "gdbcore.h"
#include "gdbcmd.h"
#include "objfiles.h"
#include "floatformat.h"
#include "regcache.h"
#include "trad-frame.h"
#include "frame-base.h"
#include "frame-unwind.h"
#include "dwarf2-frame.h"
#include "reggroups.h"
#include "regset.h"
#include "value.h"
#include "dis-asm.h"
#include "solib-svr4.h"
#include "prologue-value.h"
#include "linux-tdep.h"
#include "s390-linux-tdep.h"
#include "auxv.h"
#include "xml-syscall.h"
#include "stap-probe.h"
#include "ax.h"
#include "ax-gdb.h"
#include "user-regs.h"
#include "cli/cli-utils.h"
#include <ctype.h>
#include "elf/common.h"
#include "elf/s390.h"
#include "elf-bfd.h"
#include "features/s390-linux32.c"
#include "features/s390-linux32v1.c"
#include "features/s390-linux32v2.c"
#include "features/s390-linux64.c"
#include "features/s390-linux64v1.c"
#include "features/s390-linux64v2.c"
#include "features/s390-te-linux64.c"
#include "features/s390-vx-linux64.c"
#include "features/s390-tevx-linux64.c"
#include "features/s390x-linux64.c"
#include "features/s390x-linux64v1.c"
#include "features/s390x-linux64v2.c"
#include "features/s390x-te-linux64.c"
#include "features/s390x-vx-linux64.c"
#include "features/s390x-tevx-linux64.c"
#define XML_SYSCALL_FILENAME_S390 "syscalls/s390-linux.xml"
#define XML_SYSCALL_FILENAME_S390X "syscalls/s390x-linux.xml"
enum s390_abi_kind
{
ABI_LINUX_S390,
ABI_LINUX_ZSERIES
};
enum s390_vector_abi_kind
{
S390_VECTOR_ABI_NONE,
S390_VECTOR_ABI_128
};
/* The tdep structure. */
struct gdbarch_tdep
{
/* ABI version. */
enum s390_abi_kind abi;
/* Vector ABI. */
enum s390_vector_abi_kind vector_abi;
/* Pseudo register numbers. */
int gpr_full_regnum;
int pc_regnum;
int cc_regnum;
int v0_full_regnum;
int have_linux_v1;
int have_linux_v2;
int have_tdb;
};
/* ABI call-saved register information. */
static int
s390_register_call_saved (struct gdbarch *gdbarch, int regnum)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
switch (tdep->abi)
{
case ABI_LINUX_S390:
if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
|| regnum == S390_F4_REGNUM || regnum == S390_F6_REGNUM
|| regnum == S390_A0_REGNUM)
return 1;
break;
case ABI_LINUX_ZSERIES:
if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
|| (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM)
|| (regnum >= S390_A0_REGNUM && regnum <= S390_A1_REGNUM))
return 1;
break;
}
return 0;
}
static int
s390_cannot_store_register (struct gdbarch *gdbarch, int regnum)
{
/* The last-break address is read-only. */
return regnum == S390_LAST_BREAK_REGNUM;
}
static void
s390_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
/* Set special SYSTEM_CALL register to 0 to prevent the kernel from
messing with the PC we just installed, if we happen to be within
an interrupted system call that the kernel wants to restart.
Note that after we return from the dummy call, the SYSTEM_CALL and
ORIG_R2 registers will be automatically restored, and the kernel
continues to restart the system call at this point. */
if (register_size (gdbarch, S390_SYSTEM_CALL_REGNUM) > 0)
regcache_cooked_write_unsigned (regcache, S390_SYSTEM_CALL_REGNUM, 0);
}
/* DWARF Register Mapping. */
static const short s390_dwarf_regmap[] =
{
/* 0-15: General Purpose Registers. */
S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
/* 16-31: Floating Point Registers / Vector Registers 0-15. */
S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
/* 32-47: Control Registers (not mapped). */
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
/* 48-63: Access Registers. */
S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
/* 64-65: Program Status Word. */
S390_PSWM_REGNUM,
S390_PSWA_REGNUM,
/* 66-67: Reserved. */
-1, -1,
/* 68-83: Vector Registers 16-31. */
S390_V16_REGNUM, S390_V18_REGNUM, S390_V20_REGNUM, S390_V22_REGNUM,
S390_V17_REGNUM, S390_V19_REGNUM, S390_V21_REGNUM, S390_V23_REGNUM,
S390_V24_REGNUM, S390_V26_REGNUM, S390_V28_REGNUM, S390_V30_REGNUM,
S390_V25_REGNUM, S390_V27_REGNUM, S390_V29_REGNUM, S390_V31_REGNUM,
/* End of "official" DWARF registers. The remainder of the map is
for GDB internal use only. */
/* GPR Lower Half Access. */
S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
};
enum { s390_dwarf_reg_r0l = ARRAY_SIZE (s390_dwarf_regmap) - 16 };
/* Convert DWARF register number REG to the appropriate register
number used by GDB. */
static int
s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
int gdb_reg = -1;
/* In a 32-on-64 debug scenario, debug info refers to the full
64-bit GPRs. Note that call frame information still refers to
the 32-bit lower halves, because s390_adjust_frame_regnum uses
special register numbers to access GPRs. */
if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)
return tdep->gpr_full_regnum + reg;
if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
gdb_reg = s390_dwarf_regmap[reg];
if (tdep->v0_full_regnum == -1)
{
if (gdb_reg >= S390_V16_REGNUM && gdb_reg <= S390_V31_REGNUM)
gdb_reg = -1;
}
else
{
if (gdb_reg >= S390_F0_REGNUM && gdb_reg <= S390_F15_REGNUM)
gdb_reg = gdb_reg - S390_F0_REGNUM + tdep->v0_full_regnum;
}
return gdb_reg;
}
/* Translate a .eh_frame register to DWARF register, or adjust a
.debug_frame register. */
static int
s390_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)
{
/* See s390_dwarf_reg_to_regnum for comments. */
return (num >= 0 && num < 16) ? num + s390_dwarf_reg_r0l : num;
}
/* Pseudo registers. */
static int
regnum_is_gpr_full (struct gdbarch_tdep *tdep, int regnum)
{
return (tdep->gpr_full_regnum != -1
&& regnum >= tdep->gpr_full_regnum
&& regnum <= tdep->gpr_full_regnum + 15);
}
/* Check whether REGNUM indicates a full vector register (v0-v15).
These pseudo-registers are composed of f0-f15 and v0l-v15l. */
static int
regnum_is_vxr_full (struct gdbarch_tdep *tdep, int regnum)
{
return (tdep->v0_full_regnum != -1
&& regnum >= tdep->v0_full_regnum
&& regnum <= tdep->v0_full_regnum + 15);
}
/* Return the name of register REGNO. Return the empty string for
registers that shouldn't be visible. */
static const char *
s390_register_name (struct gdbarch *gdbarch, int regnum)
{
if (regnum >= S390_V0_LOWER_REGNUM
&& regnum <= S390_V15_LOWER_REGNUM)
return "";
return tdesc_register_name (gdbarch, regnum);
}
static const char *
s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
if (regnum == tdep->pc_regnum)
return "pc";
if (regnum == tdep->cc_regnum)
return "cc";
if (regnum_is_gpr_full (tdep, regnum))
{
static const char *full_name[] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
};
return full_name[regnum - tdep->gpr_full_regnum];
}
if (regnum_is_vxr_full (tdep, regnum))
{
static const char *full_name[] = {
"v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7",
"v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15"
};
return full_name[regnum - tdep->v0_full_regnum];
}
internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
static struct type *
s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
if (regnum == tdep->pc_regnum)
return builtin_type (gdbarch)->builtin_func_ptr;
if (regnum == tdep->cc_regnum)
return builtin_type (gdbarch)->builtin_int;
if (regnum_is_gpr_full (tdep, regnum))
return builtin_type (gdbarch)->builtin_uint64;
if (regnum_is_vxr_full (tdep, regnum))
return tdesc_find_type (gdbarch, "vec128");
internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
static enum register_status
s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
int regnum, gdb_byte *buf)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int regsize = register_size (gdbarch, regnum);
ULONGEST val;
if (regnum == tdep->pc_regnum)
{
enum register_status status;
status = regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
if (status == REG_VALID)
{
if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
val &= 0x7fffffff;
store_unsigned_integer (buf, regsize, byte_order, val);
}
return status;
}
if (regnum == tdep->cc_regnum)
{
enum register_status status;
status = regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
if (status == REG_VALID)
{
if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
val = (val >> 12) & 3;
else
val = (val >> 44) & 3;
store_unsigned_integer (buf, regsize, byte_order, val);
}
return status;
}
if (regnum_is_gpr_full (tdep, regnum))
{
enum register_status status;
ULONGEST val_upper;
regnum -= tdep->gpr_full_regnum;
status = regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
if (status == REG_VALID)
status = regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
&val_upper);
if (status == REG_VALID)
{
val |= val_upper << 32;
store_unsigned_integer (buf, regsize, byte_order, val);
}
return status;
}
if (regnum_is_vxr_full (tdep, regnum))
{
enum register_status status;
regnum -= tdep->v0_full_regnum;
status = regcache_raw_read (regcache, S390_F0_REGNUM + regnum, buf);
if (status == REG_VALID)
status = regcache_raw_read (regcache,
S390_V0_LOWER_REGNUM + regnum, buf + 8);
return status;
}
internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
static void
s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
int regnum, const gdb_byte *buf)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int regsize = register_size (gdbarch, regnum);
ULONGEST val, psw;
if (regnum == tdep->pc_regnum)
{
val = extract_unsigned_integer (buf, regsize, byte_order);
if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
{
regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
val = (psw & 0x80000000) | (val & 0x7fffffff);
}
regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, val);
return;
}
if (regnum == tdep->cc_regnum)
{
val = extract_unsigned_integer (buf, regsize, byte_order);
regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
val = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
else
val = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, val);
return;
}
if (regnum_is_gpr_full (tdep, regnum))
{
regnum -= tdep->gpr_full_regnum;
val = extract_unsigned_integer (buf, regsize, byte_order);
regcache_raw_write_unsigned (regcache, S390_R0_REGNUM + regnum,
val & 0xffffffff);
regcache_raw_write_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
val >> 32);
return;
}
if (regnum_is_vxr_full (tdep, regnum))
{
regnum -= tdep->v0_full_regnum;
regcache_raw_write (regcache, S390_F0_REGNUM + regnum, buf);
regcache_raw_write (regcache, S390_V0_LOWER_REGNUM + regnum, buf + 8);
return;
}
internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
/* 'float' values are stored in the upper half of floating-point
registers, even though we are otherwise a big-endian platform. The
same applies to a 'float' value within a vector. */
static struct value *
s390_value_from_register (struct gdbarch *gdbarch, struct type *type,
int regnum, struct frame_id frame_id)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
struct value *value = default_value_from_register (gdbarch, type,
regnum, frame_id);
check_typedef (type);
if ((regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM
&& TYPE_LENGTH (type) < 8)
|| regnum_is_vxr_full (tdep, regnum)
|| (regnum >= S390_V16_REGNUM && regnum <= S390_V31_REGNUM))
set_value_offset (value, 0);
return value;
}
/* Register groups. */
static int
s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
struct reggroup *group)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* We usually save/restore the whole PSW, which includes PC and CC.
However, some older gdbservers may not support saving/restoring
the whole PSW yet, and will return an XML register description
excluding those from the save/restore register groups. In those
cases, we still need to explicitly save/restore PC and CC in order
to push or pop frames. Since this doesn't hurt anything if we
already save/restore the whole PSW (it's just redundant), we add
PC and CC at this point unconditionally. */
if (group == save_reggroup || group == restore_reggroup)
return regnum == tdep->pc_regnum || regnum == tdep->cc_regnum;
if (group == vector_reggroup)
return regnum_is_vxr_full (tdep, regnum);
if (group == general_reggroup && regnum_is_vxr_full (tdep, regnum))
return 0;
return default_register_reggroup_p (gdbarch, regnum, group);
}
/* Maps for register sets. */
static const struct regcache_map_entry s390_gregmap[] =
{
{ 1, S390_PSWM_REGNUM },
{ 1, S390_PSWA_REGNUM },
{ 16, S390_R0_REGNUM },
{ 16, S390_A0_REGNUM },
{ 1, S390_ORIG_R2_REGNUM },
{ 0 }
};
static const struct regcache_map_entry s390_fpregmap[] =
{
{ 1, S390_FPC_REGNUM, 8 },
{ 16, S390_F0_REGNUM, 8 },
{ 0 }
};
static const struct regcache_map_entry s390_regmap_upper[] =
{
{ 16, S390_R0_UPPER_REGNUM, 4 },
{ 0 }
};
static const struct regcache_map_entry s390_regmap_last_break[] =
{
{ 1, REGCACHE_MAP_SKIP, 4 },
{ 1, S390_LAST_BREAK_REGNUM, 4 },
{ 0 }
};
static const struct regcache_map_entry s390x_regmap_last_break[] =
{
{ 1, S390_LAST_BREAK_REGNUM, 8 },
{ 0 }
};
static const struct regcache_map_entry s390_regmap_system_call[] =
{
{ 1, S390_SYSTEM_CALL_REGNUM, 4 },
{ 0 }
};
static const struct regcache_map_entry s390_regmap_tdb[] =
{
{ 1, S390_TDB_DWORD0_REGNUM, 8 },
{ 1, S390_TDB_ABORT_CODE_REGNUM, 8 },
{ 1, S390_TDB_CONFLICT_TOKEN_REGNUM, 8 },
{ 1, S390_TDB_ATIA_REGNUM, 8 },
{ 12, REGCACHE_MAP_SKIP, 8 },
{ 16, S390_TDB_R0_REGNUM, 8 },
{ 0 }
};
static const struct regcache_map_entry s390_regmap_vxrs_low[] =
{
{ 16, S390_V0_LOWER_REGNUM, 8 },
{ 0 }
};
static const struct regcache_map_entry s390_regmap_vxrs_high[] =
{
{ 16, S390_V16_REGNUM, 16 },
{ 0 }
};
/* Supply the TDB regset. Like regcache_supply_regset, but invalidate
the TDB registers unless the TDB format field is valid. */
static void
s390_supply_tdb_regset (const struct regset *regset, struct regcache *regcache,
int regnum, const void *regs, size_t len)
{
ULONGEST tdw;
enum register_status ret;
int i;
regcache_supply_regset (regset, regcache, regnum, regs, len);
ret = regcache_cooked_read_unsigned (regcache, S390_TDB_DWORD0_REGNUM, &tdw);
if (ret != REG_VALID || (tdw >> 56) != 1)
regcache_supply_regset (regset, regcache, regnum, NULL, len);
}
const struct regset s390_gregset = {
s390_gregmap,
regcache_supply_regset,
regcache_collect_regset
};
const struct regset s390_fpregset = {
s390_fpregmap,
regcache_supply_regset,
regcache_collect_regset
};
static const struct regset s390_upper_regset = {
s390_regmap_upper,
regcache_supply_regset,
regcache_collect_regset
};
const struct regset s390_last_break_regset = {
s390_regmap_last_break,
regcache_supply_regset,
regcache_collect_regset
};
const struct regset s390x_last_break_regset = {
s390x_regmap_last_break,
regcache_supply_regset,
regcache_collect_regset
};
const struct regset s390_system_call_regset = {
s390_regmap_system_call,
regcache_supply_regset,
regcache_collect_regset
};
const struct regset s390_tdb_regset = {
s390_regmap_tdb,
s390_supply_tdb_regset,
regcache_collect_regset
};
const struct regset s390_vxrs_low_regset = {
s390_regmap_vxrs_low,
regcache_supply_regset,
regcache_collect_regset
};
const struct regset s390_vxrs_high_regset = {
s390_regmap_vxrs_high,
regcache_supply_regset,
regcache_collect_regset
};
/* Iterate over supported core file register note sections. */
static void
s390_iterate_over_regset_sections (struct gdbarch *gdbarch,
iterate_over_regset_sections_cb *cb,
void *cb_data,
const struct regcache *regcache)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
const int gregset_size = (tdep->abi == ABI_LINUX_S390 ?
s390_sizeof_gregset : s390x_sizeof_gregset);
cb (".reg", gregset_size, &s390_gregset, NULL, cb_data);
cb (".reg2", s390_sizeof_fpregset, &s390_fpregset, NULL, cb_data);
if (tdep->abi == ABI_LINUX_S390 && tdep->gpr_full_regnum != -1)
cb (".reg-s390-high-gprs", 16 * 4, &s390_upper_regset,
"s390 GPR upper halves", cb_data);
if (tdep->have_linux_v1)
cb (".reg-s390-last-break", 8,
(gdbarch_ptr_bit (gdbarch) == 32
? &s390_last_break_regset : &s390x_last_break_regset),
"s930 last-break address", cb_data);
if (tdep->have_linux_v2)
cb (".reg-s390-system-call", 4, &s390_system_call_regset,
"s390 system-call", cb_data);
/* If regcache is set, we are in "write" (gcore) mode. In this
case, don't iterate over the TDB unless its registers are
available. */
if (tdep->have_tdb
&& (regcache == NULL
|| REG_VALID == regcache_register_status (regcache,
S390_TDB_DWORD0_REGNUM)))
cb (".reg-s390-tdb", s390_sizeof_tdbregset, &s390_tdb_regset,
"s390 TDB", cb_data);
if (tdep->v0_full_regnum != -1)
{
cb (".reg-s390-vxrs-low", 16 * 8, &s390_vxrs_low_regset,
"s390 vector registers 0-15 lower half", cb_data);
cb (".reg-s390-vxrs-high", 16 * 16, &s390_vxrs_high_regset,
"s390 vector registers 16-31", cb_data);
}
}
static const struct target_desc *
s390_core_read_description (struct gdbarch *gdbarch,
struct target_ops *target, bfd *abfd)
{
asection *section = bfd_get_section_by_name (abfd, ".reg");
CORE_ADDR hwcap = 0;
int high_gprs, v1, v2, te, vx;
target_auxv_search (target, AT_HWCAP, &hwcap);
if (!section)
return NULL;
high_gprs = (bfd_get_section_by_name (abfd, ".reg-s390-high-gprs")
!= NULL);
v1 = (bfd_get_section_by_name (abfd, ".reg-s390-last-break") != NULL);
v2 = (bfd_get_section_by_name (abfd, ".reg-s390-system-call") != NULL);
vx = (hwcap & HWCAP_S390_VX);
te = (hwcap & HWCAP_S390_TE);
switch (bfd_section_size (abfd, section))
{
case s390_sizeof_gregset:
if (high_gprs)
return (te && vx ? tdesc_s390_tevx_linux64 :
vx ? tdesc_s390_vx_linux64 :
te ? tdesc_s390_te_linux64 :
v2 ? tdesc_s390_linux64v2 :
v1 ? tdesc_s390_linux64v1 : tdesc_s390_linux64);
else
return (v2 ? tdesc_s390_linux32v2 :
v1 ? tdesc_s390_linux32v1 : tdesc_s390_linux32);
case s390x_sizeof_gregset:
return (te && vx ? tdesc_s390x_tevx_linux64 :
vx ? tdesc_s390x_vx_linux64 :
te ? tdesc_s390x_te_linux64 :
v2 ? tdesc_s390x_linux64v2 :
v1 ? tdesc_s390x_linux64v1 : tdesc_s390x_linux64);
default:
return NULL;
}
}
/* Decoding S/390 instructions. */
/* Named opcode values for the S/390 instructions we recognize. Some
instructions have their opcode split across two fields; those are the
op1_* and op2_* enums. */
enum
{
op1_lhi = 0xa7, op2_lhi = 0x08,
op1_lghi = 0xa7, op2_lghi = 0x09,
op1_lgfi = 0xc0, op2_lgfi = 0x01,
op_lr = 0x18,
op_lgr = 0xb904,
op_l = 0x58,
op1_ly = 0xe3, op2_ly = 0x58,
op1_lg = 0xe3, op2_lg = 0x04,
op_lm = 0x98,
op1_lmy = 0xeb, op2_lmy = 0x98,
op1_lmg = 0xeb, op2_lmg = 0x04,
op_st = 0x50,
op1_sty = 0xe3, op2_sty = 0x50,
op1_stg = 0xe3, op2_stg = 0x24,
op_std = 0x60,
op_stm = 0x90,
op1_stmy = 0xeb, op2_stmy = 0x90,
op1_stmg = 0xeb, op2_stmg = 0x24,
op1_aghi = 0xa7, op2_aghi = 0x0b,
op1_ahi = 0xa7, op2_ahi = 0x0a,
op1_agfi = 0xc2, op2_agfi = 0x08,
op1_afi = 0xc2, op2_afi = 0x09,
op1_algfi= 0xc2, op2_algfi= 0x0a,
op1_alfi = 0xc2, op2_alfi = 0x0b,
op_ar = 0x1a,
op_agr = 0xb908,
op_a = 0x5a,
op1_ay = 0xe3, op2_ay = 0x5a,
op1_ag = 0xe3, op2_ag = 0x08,
op1_slgfi= 0xc2, op2_slgfi= 0x04,
op1_slfi = 0xc2, op2_slfi = 0x05,
op_sr = 0x1b,
op_sgr = 0xb909,
op_s = 0x5b,
op1_sy = 0xe3, op2_sy = 0x5b,
op1_sg = 0xe3, op2_sg = 0x09,
op_nr = 0x14,
op_ngr = 0xb980,
op_la = 0x41,
op1_lay = 0xe3, op2_lay = 0x71,
op1_larl = 0xc0, op2_larl = 0x00,
op_basr = 0x0d,
op_bas = 0x4d,
op_bcr = 0x07,
op_bc = 0x0d,
op_bctr = 0x06,
op_bctgr = 0xb946,
op_bct = 0x46,
op1_bctg = 0xe3, op2_bctg = 0x46,
op_bxh = 0x86,
op1_bxhg = 0xeb, op2_bxhg = 0x44,
op_bxle = 0x87,
op1_bxleg= 0xeb, op2_bxleg= 0x45,
op1_bras = 0xa7, op2_bras = 0x05,
op1_brasl= 0xc0, op2_brasl= 0x05,
op1_brc = 0xa7, op2_brc = 0x04,
op1_brcl = 0xc0, op2_brcl = 0x04,
op1_brct = 0xa7, op2_brct = 0x06,
op1_brctg= 0xa7, op2_brctg= 0x07,
op_brxh = 0x84,
op1_brxhg= 0xec, op2_brxhg= 0x44,
op_brxle = 0x85,
op1_brxlg= 0xec, op2_brxlg= 0x45,
op_svc = 0x0a,
};
/* Read a single instruction from address AT. */
#define S390_MAX_INSTR_SIZE 6
static int
s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
{
static int s390_instrlen[] = { 2, 4, 4, 6 };
int instrlen;
if (target_read_memory (at, &instr[0], 2))
return -1;
instrlen = s390_instrlen[instr[0] >> 6];
if (instrlen > 2)
{
if (target_read_memory (at + 2, &instr[2], instrlen - 2))
return -1;
}
return instrlen;
}
/* The functions below are for recognizing and decoding S/390
instructions of various formats. Each of them checks whether INSN
is an instruction of the given format, with the specified opcodes.
If it is, it sets the remaining arguments to the values of the
instruction's fields, and returns a non-zero value; otherwise, it
returns zero.
These functions' arguments appear in the order they appear in the
instruction, not in the machine-language form. So, opcodes always
come first, even though they're sometimes scattered around the
instructions. And displacements appear before base and extension
registers, as they do in the assembly syntax, not at the end, as
they do in the machine language. */
static int
is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
{
if (insn[0] == op1 && (insn[1] & 0xf) == op2)
{
*r1 = (insn[1] >> 4) & 0xf;
/* i2 is a 16-bit signed quantity. */
*i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
return 1;
}
else
return 0;
}
static int
is_ril (bfd_byte *insn, int op1, int op2,
unsigned int *r1, int *i2)
{
if (insn[0] == op1 && (insn[1] & 0xf) == op2)
{
*r1 = (insn[1] >> 4) & 0xf;
/* i2 is a signed quantity. If the host 'int' is 32 bits long,
no sign extension is necessary, but we don't want to assume
that. */
*i2 = (((insn[2] << 24)
| (insn[3] << 16)
| (insn[4] << 8)
| (insn[5])) ^ 0x80000000) - 0x80000000;
return 1;
}
else
return 0;
}
static int
is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
{
if (insn[0] == op)
{
*r1 = (insn[1] >> 4) & 0xf;
*r2 = insn[1] & 0xf;
return 1;
}
else
return 0;
}
static int
is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
{
if (((insn[0] << 8) | insn[1]) == op)
{
/* Yes, insn[3]. insn[2] is unused in RRE format. */
*r1 = (insn[3] >> 4) & 0xf;
*r2 = insn[3] & 0xf;
return 1;
}
else
return 0;
}
static int
is_rs (bfd_byte *insn, int op,
unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
{
if (insn[0] == op)
{
*r1 = (insn[1] >> 4) & 0xf;
*r3 = insn[1] & 0xf;
*b2 = (insn[2] >> 4) & 0xf;
*d2 = ((insn[2] & 0xf) << 8) | insn[3];
return 1;
}
else
return 0;
}
static int
is_rsy (bfd_byte *insn, int op1, int op2,
unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
{
if (insn[0] == op1
&& insn[5] == op2)
{
*r1 = (insn[1] >> 4) & 0xf;
*r3 = insn[1] & 0xf;
*b2 = (insn[2] >> 4) & 0xf;
/* The 'long displacement' is a 20-bit signed integer. */
*d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
^ 0x80000) - 0x80000;
return 1;
}
else
return 0;
}
static int
is_rsi (bfd_byte *insn, int op,
unsigned int *r1, unsigned int *r3, int *i2)
{
if (insn[0] == op)
{
*r1 = (insn[1] >> 4) & 0xf;
*r3 = insn[1] & 0xf;
/* i2 is a 16-bit signed quantity. */
*i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
return 1;
}
else
return 0;
}
static int
is_rie (bfd_byte *insn, int op1, int op2,
unsigned int *r1, unsigned int *r3, int *i2)
{
if (insn[0] == op1
&& insn[5] == op2)
{
*r1 = (insn[1] >> 4) & 0xf;
*r3 = insn[1] & 0xf;
/* i2 is a 16-bit signed quantity. */
*i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
return 1;
}
else
return 0;