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d45963c2b2
Add missing include. 2019-03-25 Alan Hayward <alan.hayward@arm.com> * s390-linux-nat.c: Add include.
1083 lines
32 KiB
C
1083 lines
32 KiB
C
/* S390 native-dependent code for GDB, the GNU debugger.
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Copyright (C) 2001-2019 Free Software Foundation, Inc.
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Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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for IBM Deutschland Entwicklung GmbH, IBM Corporation.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "regcache.h"
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#include "inferior.h"
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#include "target.h"
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#include "linux-nat.h"
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#include "auxv.h"
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#include "gregset.h"
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#include "regset.h"
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#include "nat/linux-ptrace.h"
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#include "gdbcmd.h"
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#include "s390-tdep.h"
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#include "s390-linux-tdep.h"
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#include "elf/common.h"
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#include <asm/ptrace.h>
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#include "nat/gdb_ptrace.h"
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#include <asm/types.h>
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#include <sys/procfs.h>
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#include <sys/ucontext.h>
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#include <elf.h>
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#include <algorithm>
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#include "inf-ptrace.h"
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#include "linux-tdep.h"
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/* Per-thread arch-specific data. */
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struct arch_lwp_info
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{
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/* Non-zero if the thread's PER info must be re-written. */
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int per_info_changed;
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};
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static int have_regset_last_break = 0;
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static int have_regset_system_call = 0;
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static int have_regset_tdb = 0;
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static int have_regset_vxrs = 0;
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static int have_regset_gs = 0;
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/* Register map for 32-bit executables running under a 64-bit
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kernel. */
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#ifdef __s390x__
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static const struct regcache_map_entry s390_64_regmap_gregset[] =
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{
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/* Skip PSWM and PSWA, since they must be handled specially. */
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{ 2, REGCACHE_MAP_SKIP, 8 },
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{ 1, S390_R0_UPPER_REGNUM, 4 }, { 1, S390_R0_REGNUM, 4 },
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{ 1, S390_R1_UPPER_REGNUM, 4 }, { 1, S390_R1_REGNUM, 4 },
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{ 1, S390_R2_UPPER_REGNUM, 4 }, { 1, S390_R2_REGNUM, 4 },
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{ 1, S390_R3_UPPER_REGNUM, 4 }, { 1, S390_R3_REGNUM, 4 },
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{ 1, S390_R4_UPPER_REGNUM, 4 }, { 1, S390_R4_REGNUM, 4 },
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{ 1, S390_R5_UPPER_REGNUM, 4 }, { 1, S390_R5_REGNUM, 4 },
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{ 1, S390_R6_UPPER_REGNUM, 4 }, { 1, S390_R6_REGNUM, 4 },
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{ 1, S390_R7_UPPER_REGNUM, 4 }, { 1, S390_R7_REGNUM, 4 },
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{ 1, S390_R8_UPPER_REGNUM, 4 }, { 1, S390_R8_REGNUM, 4 },
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{ 1, S390_R9_UPPER_REGNUM, 4 }, { 1, S390_R9_REGNUM, 4 },
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{ 1, S390_R10_UPPER_REGNUM, 4 }, { 1, S390_R10_REGNUM, 4 },
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{ 1, S390_R11_UPPER_REGNUM, 4 }, { 1, S390_R11_REGNUM, 4 },
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{ 1, S390_R12_UPPER_REGNUM, 4 }, { 1, S390_R12_REGNUM, 4 },
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{ 1, S390_R13_UPPER_REGNUM, 4 }, { 1, S390_R13_REGNUM, 4 },
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{ 1, S390_R14_UPPER_REGNUM, 4 }, { 1, S390_R14_REGNUM, 4 },
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{ 1, S390_R15_UPPER_REGNUM, 4 }, { 1, S390_R15_REGNUM, 4 },
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{ 16, S390_A0_REGNUM, 4 },
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{ 1, REGCACHE_MAP_SKIP, 4 }, { 1, S390_ORIG_R2_REGNUM, 4 },
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{ 0 }
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};
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static const struct regset s390_64_gregset =
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{
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s390_64_regmap_gregset,
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regcache_supply_regset,
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regcache_collect_regset
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};
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#define S390_PSWM_OFFSET 0
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#define S390_PSWA_OFFSET 8
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#endif
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/* PER-event mask bits and PER control bits (CR9). */
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#define PER_BIT(n) (1UL << (63 - (n)))
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#define PER_EVENT_BRANCH PER_BIT (32)
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#define PER_EVENT_IFETCH PER_BIT (33)
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#define PER_EVENT_STORE PER_BIT (34)
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#define PER_EVENT_NULLIFICATION PER_BIT (39)
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#define PER_CONTROL_BRANCH_ADDRESS PER_BIT (40)
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#define PER_CONTROL_SUSPENSION PER_BIT (41)
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#define PER_CONTROL_ALTERATION PER_BIT (42)
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class s390_linux_nat_target final : public linux_nat_target
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{
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public:
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/* Add our register access methods. */
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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/* Add our watchpoint methods. */
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int can_use_hw_breakpoint (enum bptype, int, int) override;
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int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *)
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override;
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int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *)
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override;
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int region_ok_for_hw_watchpoint (CORE_ADDR, int) override;
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bool stopped_by_watchpoint () override;
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int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
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struct expression *) override;
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int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
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struct expression *) override;
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/* Detect target architecture. */
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const struct target_desc *read_description () override;
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int auxv_parse (gdb_byte **readptr,
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gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
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override;
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/* Override linux_nat_target low methods. */
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void low_new_thread (struct lwp_info *lp) override;
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void low_delete_thread (struct arch_lwp_info *lp) override;
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void low_prepare_to_resume (struct lwp_info *lp) override;
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void low_new_fork (struct lwp_info *parent, pid_t child_pid) override;
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void low_forget_process (pid_t pid) override;
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};
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static s390_linux_nat_target the_s390_linux_nat_target;
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/* Fill GDB's register array with the general-purpose register values
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in *REGP.
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When debugging a 32-bit executable running under a 64-bit kernel,
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we have to fix up the 64-bit registers we get from the kernel to
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make them look like 32-bit registers. */
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void
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supply_gregset (struct regcache *regcache, const gregset_t *regp)
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{
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#ifdef __s390x__
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struct gdbarch *gdbarch = regcache->arch ();
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if (gdbarch_ptr_bit (gdbarch) == 32)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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ULONGEST pswm, pswa;
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gdb_byte buf[4];
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regcache_supply_regset (&s390_64_gregset, regcache, -1,
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regp, sizeof (gregset_t));
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pswm = extract_unsigned_integer ((const gdb_byte *) regp
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+ S390_PSWM_OFFSET, 8, byte_order);
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pswa = extract_unsigned_integer ((const gdb_byte *) regp
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+ S390_PSWA_OFFSET, 8, byte_order);
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store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000);
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regcache->raw_supply (S390_PSWM_REGNUM, buf);
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store_unsigned_integer (buf, 4, byte_order,
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(pswa & 0x7fffffff) | (pswm & 0x80000000));
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regcache->raw_supply (S390_PSWA_REGNUM, buf);
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return;
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}
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#endif
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regcache_supply_regset (&s390_gregset, regcache, -1, regp,
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sizeof (gregset_t));
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*REGP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno)
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{
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#ifdef __s390x__
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struct gdbarch *gdbarch = regcache->arch ();
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if (gdbarch_ptr_bit (gdbarch) == 32)
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{
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regcache_collect_regset (&s390_64_gregset, regcache, regno,
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regp, sizeof (gregset_t));
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if (regno == -1
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|| regno == S390_PSWM_REGNUM || regno == S390_PSWA_REGNUM)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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ULONGEST pswa, pswm;
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gdb_byte buf[4];
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gdb_byte *pswm_p = (gdb_byte *) regp + S390_PSWM_OFFSET;
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gdb_byte *pswa_p = (gdb_byte *) regp + S390_PSWA_OFFSET;
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pswm = extract_unsigned_integer (pswm_p, 8, byte_order);
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if (regno == -1 || regno == S390_PSWM_REGNUM)
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{
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pswm &= 0x80000000;
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regcache->raw_collect (S390_PSWM_REGNUM, buf);
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pswm |= (extract_unsigned_integer (buf, 4, byte_order)
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& 0xfff7ffff) << 32;
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}
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if (regno == -1 || regno == S390_PSWA_REGNUM)
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{
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regcache->raw_collect (S390_PSWA_REGNUM, buf);
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pswa = extract_unsigned_integer (buf, 4, byte_order);
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pswm ^= (pswm ^ pswa) & 0x80000000;
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pswa &= 0x7fffffff;
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store_unsigned_integer (pswa_p, 8, byte_order, pswa);
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}
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store_unsigned_integer (pswm_p, 8, byte_order, pswm);
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}
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return;
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}
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#endif
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regcache_collect_regset (&s390_gregset, regcache, regno, regp,
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sizeof (gregset_t));
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}
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/* Fill GDB's register array with the floating-point register values
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in *REGP. */
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void
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supply_fpregset (struct regcache *regcache, const fpregset_t *regp)
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{
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regcache_supply_regset (&s390_fpregset, regcache, -1, regp,
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sizeof (fpregset_t));
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*REGP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno)
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{
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regcache_collect_regset (&s390_fpregset, regcache, regno, regp,
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sizeof (fpregset_t));
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}
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/* Find the TID for the current inferior thread to use with ptrace. */
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static int
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s390_inferior_tid (void)
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{
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/* GNU/Linux LWP ID's are process ID's. */
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int tid = inferior_ptid.lwp ();
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if (tid == 0)
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tid = inferior_ptid.pid (); /* Not a threaded program. */
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return tid;
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}
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/* Fetch all general-purpose registers from process/thread TID and
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store their values in GDB's register cache. */
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static void
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fetch_regs (struct regcache *regcache, int tid)
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{
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gregset_t regs;
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ptrace_area parea;
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parea.len = sizeof (regs);
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parea.process_addr = (addr_t) ®s;
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parea.kernel_addr = offsetof (struct user_regs_struct, psw);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
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perror_with_name (_("Couldn't get registers"));
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supply_gregset (regcache, (const gregset_t *) ®s);
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}
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/* Store all valid general-purpose registers in GDB's register cache
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into the process/thread specified by TID. */
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static void
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store_regs (const struct regcache *regcache, int tid, int regnum)
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{
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gregset_t regs;
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ptrace_area parea;
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parea.len = sizeof (regs);
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parea.process_addr = (addr_t) ®s;
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parea.kernel_addr = offsetof (struct user_regs_struct, psw);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
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perror_with_name (_("Couldn't get registers"));
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fill_gregset (regcache, ®s, regnum);
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if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0)
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perror_with_name (_("Couldn't write registers"));
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}
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/* Fetch all floating-point registers from process/thread TID and store
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their values in GDB's register cache. */
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static void
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fetch_fpregs (struct regcache *regcache, int tid)
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{
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fpregset_t fpregs;
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ptrace_area parea;
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parea.len = sizeof (fpregs);
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parea.process_addr = (addr_t) &fpregs;
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parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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supply_fpregset (regcache, (const fpregset_t *) &fpregs);
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}
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/* Store all valid floating-point registers in GDB's register cache
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into the process/thread specified by TID. */
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static void
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store_fpregs (const struct regcache *regcache, int tid, int regnum)
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{
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fpregset_t fpregs;
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ptrace_area parea;
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parea.len = sizeof (fpregs);
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parea.process_addr = (addr_t) &fpregs;
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parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
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if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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fill_fpregset (regcache, &fpregs, regnum);
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if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0)
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perror_with_name (_("Couldn't write floating point status"));
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}
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/* Fetch all registers in the kernel's register set whose number is
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REGSET_ID, whose size is REGSIZE, and whose layout is described by
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REGSET, from process/thread TID and store their values in GDB's
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register cache. */
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static void
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fetch_regset (struct regcache *regcache, int tid,
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int regset_id, int regsize, const struct regset *regset)
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{
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void *buf = alloca (regsize);
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struct iovec iov;
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iov.iov_base = buf;
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iov.iov_len = regsize;
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if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0)
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{
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if (errno == ENODATA)
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regcache_supply_regset (regset, regcache, -1, NULL, regsize);
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else
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perror_with_name (_("Couldn't get register set"));
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}
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else
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regcache_supply_regset (regset, regcache, -1, buf, regsize);
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}
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/* Store all registers in the kernel's register set whose number is
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REGSET_ID, whose size is REGSIZE, and whose layout is described by
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REGSET, from GDB's register cache back to process/thread TID. */
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static void
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store_regset (struct regcache *regcache, int tid,
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int regset_id, int regsize, const struct regset *regset)
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{
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void *buf = alloca (regsize);
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struct iovec iov;
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iov.iov_base = buf;
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iov.iov_len = regsize;
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if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0)
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perror_with_name (_("Couldn't get register set"));
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regcache_collect_regset (regset, regcache, -1, buf, regsize);
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if (ptrace (PTRACE_SETREGSET, tid, (long) regset_id, (long) &iov) < 0)
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perror_with_name (_("Couldn't set register set"));
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}
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/* Check whether the kernel provides a register set with number REGSET
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of size REGSIZE for process/thread TID. */
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static int
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check_regset (int tid, int regset, int regsize)
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{
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void *buf = alloca (regsize);
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struct iovec iov;
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iov.iov_base = buf;
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iov.iov_len = regsize;
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if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) >= 0
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|| errno == ENODATA)
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return 1;
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return 0;
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}
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/* Fetch register REGNUM from the child process. If REGNUM is -1, do
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this for all registers. */
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void
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s390_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
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{
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pid_t tid = get_ptrace_pid (regcache->ptid ());
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if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
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fetch_regs (regcache, tid);
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if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum))
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fetch_fpregs (regcache, tid);
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if (have_regset_last_break)
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if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM)
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fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8,
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(gdbarch_ptr_bit (regcache->arch ()) == 32
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? &s390_last_break_regset : &s390x_last_break_regset));
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if (have_regset_system_call)
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if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM)
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fetch_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4,
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&s390_system_call_regset);
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if (have_regset_tdb)
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if (regnum == -1 || S390_IS_TDBREGSET_REGNUM (regnum))
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fetch_regset (regcache, tid, NT_S390_TDB, s390_sizeof_tdbregset,
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&s390_tdb_regset);
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if (have_regset_vxrs)
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{
|
|
if (regnum == -1 || (regnum >= S390_V0_LOWER_REGNUM
|
|
&& regnum <= S390_V15_LOWER_REGNUM))
|
|
fetch_regset (regcache, tid, NT_S390_VXRS_LOW, 16 * 8,
|
|
&s390_vxrs_low_regset);
|
|
if (regnum == -1 || (regnum >= S390_V16_REGNUM
|
|
&& regnum <= S390_V31_REGNUM))
|
|
fetch_regset (regcache, tid, NT_S390_VXRS_HIGH, 16 * 16,
|
|
&s390_vxrs_high_regset);
|
|
}
|
|
|
|
if (have_regset_gs)
|
|
{
|
|
if (regnum == -1 || (regnum >= S390_GSD_REGNUM
|
|
&& regnum <= S390_GSEPLA_REGNUM))
|
|
fetch_regset (regcache, tid, NT_S390_GS_CB, 4 * 8,
|
|
&s390_gs_regset);
|
|
if (regnum == -1 || (regnum >= S390_BC_GSD_REGNUM
|
|
&& regnum <= S390_BC_GSEPLA_REGNUM))
|
|
fetch_regset (regcache, tid, NT_S390_GS_BC, 4 * 8,
|
|
&s390_gsbc_regset);
|
|
}
|
|
}
|
|
|
|
/* Store register REGNUM back into the child process. If REGNUM is
|
|
-1, do this for all registers. */
|
|
void
|
|
s390_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
|
|
{
|
|
pid_t tid = get_ptrace_pid (regcache->ptid ());
|
|
|
|
if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
|
|
store_regs (regcache, tid, regnum);
|
|
|
|
if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum))
|
|
store_fpregs (regcache, tid, regnum);
|
|
|
|
/* S390_LAST_BREAK_REGNUM is read-only. */
|
|
|
|
if (have_regset_system_call)
|
|
if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM)
|
|
store_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4,
|
|
&s390_system_call_regset);
|
|
|
|
if (have_regset_vxrs)
|
|
{
|
|
if (regnum == -1 || (regnum >= S390_V0_LOWER_REGNUM
|
|
&& regnum <= S390_V15_LOWER_REGNUM))
|
|
store_regset (regcache, tid, NT_S390_VXRS_LOW, 16 * 8,
|
|
&s390_vxrs_low_regset);
|
|
if (regnum == -1 || (regnum >= S390_V16_REGNUM
|
|
&& regnum <= S390_V31_REGNUM))
|
|
store_regset (regcache, tid, NT_S390_VXRS_HIGH, 16 * 16,
|
|
&s390_vxrs_high_regset);
|
|
}
|
|
}
|
|
|
|
|
|
/* Hardware-assisted watchpoint handling. */
|
|
|
|
/* For each process we maintain a list of all currently active
|
|
watchpoints, in order to properly handle watchpoint removal.
|
|
|
|
The only thing we actually need is the total address space area
|
|
spanned by the watchpoints. */
|
|
|
|
typedef struct watch_area
|
|
{
|
|
CORE_ADDR lo_addr;
|
|
CORE_ADDR hi_addr;
|
|
} s390_watch_area;
|
|
|
|
DEF_VEC_O (s390_watch_area);
|
|
|
|
/* Hardware debug state. */
|
|
|
|
struct s390_debug_reg_state
|
|
{
|
|
VEC_s390_watch_area *watch_areas;
|
|
VEC_s390_watch_area *break_areas;
|
|
};
|
|
|
|
/* Per-process data. */
|
|
|
|
struct s390_process_info
|
|
{
|
|
struct s390_process_info *next;
|
|
pid_t pid;
|
|
struct s390_debug_reg_state state;
|
|
};
|
|
|
|
static struct s390_process_info *s390_process_list = NULL;
|
|
|
|
/* Find process data for process PID. */
|
|
|
|
static struct s390_process_info *
|
|
s390_find_process_pid (pid_t pid)
|
|
{
|
|
struct s390_process_info *proc;
|
|
|
|
for (proc = s390_process_list; proc; proc = proc->next)
|
|
if (proc->pid == pid)
|
|
return proc;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Add process data for process PID. Returns newly allocated info
|
|
object. */
|
|
|
|
static struct s390_process_info *
|
|
s390_add_process (pid_t pid)
|
|
{
|
|
struct s390_process_info *proc = XCNEW (struct s390_process_info);
|
|
|
|
proc->pid = pid;
|
|
proc->next = s390_process_list;
|
|
s390_process_list = proc;
|
|
|
|
return proc;
|
|
}
|
|
|
|
/* Get data specific info for process PID, creating it if necessary.
|
|
Never returns NULL. */
|
|
|
|
static struct s390_process_info *
|
|
s390_process_info_get (pid_t pid)
|
|
{
|
|
struct s390_process_info *proc;
|
|
|
|
proc = s390_find_process_pid (pid);
|
|
if (proc == NULL)
|
|
proc = s390_add_process (pid);
|
|
|
|
return proc;
|
|
}
|
|
|
|
/* Get hardware debug state for process PID. */
|
|
|
|
static struct s390_debug_reg_state *
|
|
s390_get_debug_reg_state (pid_t pid)
|
|
{
|
|
return &s390_process_info_get (pid)->state;
|
|
}
|
|
|
|
/* Called whenever GDB is no longer debugging process PID. It deletes
|
|
data structures that keep track of hardware debug state. */
|
|
|
|
void
|
|
s390_linux_nat_target::low_forget_process (pid_t pid)
|
|
{
|
|
struct s390_process_info *proc, **proc_link;
|
|
|
|
proc = s390_process_list;
|
|
proc_link = &s390_process_list;
|
|
|
|
while (proc != NULL)
|
|
{
|
|
if (proc->pid == pid)
|
|
{
|
|
VEC_free (s390_watch_area, proc->state.watch_areas);
|
|
VEC_free (s390_watch_area, proc->state.break_areas);
|
|
*proc_link = proc->next;
|
|
xfree (proc);
|
|
return;
|
|
}
|
|
|
|
proc_link = &proc->next;
|
|
proc = *proc_link;
|
|
}
|
|
}
|
|
|
|
/* linux_nat_new_fork hook. */
|
|
|
|
void
|
|
s390_linux_nat_target::low_new_fork (struct lwp_info *parent, pid_t child_pid)
|
|
{
|
|
pid_t parent_pid;
|
|
struct s390_debug_reg_state *parent_state;
|
|
struct s390_debug_reg_state *child_state;
|
|
|
|
/* NULL means no watchpoint has ever been set in the parent. In
|
|
that case, there's nothing to do. */
|
|
if (lwp_arch_private_info (parent) == NULL)
|
|
return;
|
|
|
|
/* GDB core assumes the child inherits the watchpoints/hw breakpoints of
|
|
the parent. So copy the debug state from parent to child. */
|
|
|
|
parent_pid = parent->ptid.pid ();
|
|
parent_state = s390_get_debug_reg_state (parent_pid);
|
|
child_state = s390_get_debug_reg_state (child_pid);
|
|
|
|
child_state->watch_areas = VEC_copy (s390_watch_area,
|
|
parent_state->watch_areas);
|
|
child_state->break_areas = VEC_copy (s390_watch_area,
|
|
parent_state->break_areas);
|
|
}
|
|
|
|
/* Dump PER state. */
|
|
|
|
static void
|
|
s390_show_debug_regs (int tid, const char *where)
|
|
{
|
|
per_struct per_info;
|
|
ptrace_area parea;
|
|
|
|
parea.len = sizeof (per_info);
|
|
parea.process_addr = (addr_t) &per_info;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, per_info);
|
|
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea, 0) < 0)
|
|
perror_with_name (_("Couldn't retrieve debug regs"));
|
|
|
|
debug_printf ("PER (debug) state for %d -- %s\n"
|
|
" cr9-11: %lx %lx %lx\n"
|
|
" start, end: %lx %lx\n"
|
|
" code/ATMID: %x address: %lx PAID: %x\n",
|
|
tid,
|
|
where,
|
|
per_info.control_regs.words.cr[0],
|
|
per_info.control_regs.words.cr[1],
|
|
per_info.control_regs.words.cr[2],
|
|
per_info.starting_addr,
|
|
per_info.ending_addr,
|
|
per_info.lowcore.words.perc_atmid,
|
|
per_info.lowcore.words.address,
|
|
per_info.lowcore.words.access_id);
|
|
}
|
|
|
|
bool
|
|
s390_linux_nat_target::stopped_by_watchpoint ()
|
|
{
|
|
struct s390_debug_reg_state *state
|
|
= s390_get_debug_reg_state (inferior_ptid.pid ());
|
|
per_lowcore_bits per_lowcore;
|
|
ptrace_area parea;
|
|
|
|
if (show_debug_regs)
|
|
s390_show_debug_regs (s390_inferior_tid (), "stop");
|
|
|
|
/* Speed up common case. */
|
|
if (VEC_empty (s390_watch_area, state->watch_areas))
|
|
return false;
|
|
|
|
parea.len = sizeof (per_lowcore);
|
|
parea.process_addr = (addr_t) & per_lowcore;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, per_info.lowcore);
|
|
if (ptrace (PTRACE_PEEKUSR_AREA, s390_inferior_tid (), &parea, 0) < 0)
|
|
perror_with_name (_("Couldn't retrieve watchpoint status"));
|
|
|
|
bool result = (per_lowcore.perc_storage_alteration == 1
|
|
&& per_lowcore.perc_store_real_address == 0);
|
|
|
|
if (result)
|
|
{
|
|
/* Do not report this watchpoint again. */
|
|
memset (&per_lowcore, 0, sizeof (per_lowcore));
|
|
if (ptrace (PTRACE_POKEUSR_AREA, s390_inferior_tid (), &parea, 0) < 0)
|
|
perror_with_name (_("Couldn't clear watchpoint status"));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Each time before resuming a thread, update its PER info. */
|
|
|
|
void
|
|
s390_linux_nat_target::low_prepare_to_resume (struct lwp_info *lp)
|
|
{
|
|
int tid;
|
|
pid_t pid = ptid_of_lwp (lp).pid ();
|
|
|
|
per_struct per_info;
|
|
ptrace_area parea;
|
|
|
|
CORE_ADDR watch_lo_addr = (CORE_ADDR)-1, watch_hi_addr = 0;
|
|
unsigned ix;
|
|
s390_watch_area *area;
|
|
struct arch_lwp_info *lp_priv = lwp_arch_private_info (lp);
|
|
struct s390_debug_reg_state *state = s390_get_debug_reg_state (pid);
|
|
int step = lwp_is_stepping (lp);
|
|
|
|
/* Nothing to do if there was never any PER info for this thread. */
|
|
if (lp_priv == NULL)
|
|
return;
|
|
|
|
/* If PER info has changed, update it. When single-stepping, disable
|
|
hardware breakpoints (if any). Otherwise we're done. */
|
|
if (!lp_priv->per_info_changed)
|
|
{
|
|
if (!step || VEC_empty (s390_watch_area, state->break_areas))
|
|
return;
|
|
}
|
|
|
|
lp_priv->per_info_changed = 0;
|
|
|
|
tid = ptid_of_lwp (lp).lwp ();
|
|
if (tid == 0)
|
|
tid = pid;
|
|
|
|
parea.len = sizeof (per_info);
|
|
parea.process_addr = (addr_t) & per_info;
|
|
parea.kernel_addr = offsetof (struct user_regs_struct, per_info);
|
|
|
|
/* Clear PER info, but adjust the single_step field (used by older
|
|
kernels only). */
|
|
memset (&per_info, 0, sizeof (per_info));
|
|
per_info.single_step = (step != 0);
|
|
|
|
if (!VEC_empty (s390_watch_area, state->watch_areas))
|
|
{
|
|
for (ix = 0;
|
|
VEC_iterate (s390_watch_area, state->watch_areas, ix, area);
|
|
ix++)
|
|
{
|
|
watch_lo_addr = std::min (watch_lo_addr, area->lo_addr);
|
|
watch_hi_addr = std::max (watch_hi_addr, area->hi_addr);
|
|
}
|
|
|
|
/* Enable storage-alteration events. */
|
|
per_info.control_regs.words.cr[0] |= (PER_EVENT_STORE
|
|
| PER_CONTROL_ALTERATION);
|
|
}
|
|
|
|
if (!VEC_empty (s390_watch_area, state->break_areas))
|
|
{
|
|
/* Don't install hardware breakpoints while single-stepping, since
|
|
our PER settings (e.g. the nullification bit) might then conflict
|
|
with the kernel's. But re-install them afterwards. */
|
|
if (step)
|
|
lp_priv->per_info_changed = 1;
|
|
else
|
|
{
|
|
for (ix = 0;
|
|
VEC_iterate (s390_watch_area, state->break_areas, ix, area);
|
|
ix++)
|
|
{
|
|
watch_lo_addr = std::min (watch_lo_addr, area->lo_addr);
|
|
watch_hi_addr = std::max (watch_hi_addr, area->hi_addr);
|
|
}
|
|
|
|
/* If there's just one breakpoint, enable instruction-fetching
|
|
nullification events for the breakpoint address (fast).
|
|
Otherwise stop after any instruction within the PER area and
|
|
after any branch into it (slow). */
|
|
if (watch_hi_addr == watch_lo_addr)
|
|
per_info.control_regs.words.cr[0] |= (PER_EVENT_NULLIFICATION
|
|
| PER_EVENT_IFETCH);
|
|
else
|
|
{
|
|
/* The PER area must include the instruction before the
|
|
first breakpoint address. */
|
|
watch_lo_addr = watch_lo_addr > 6 ? watch_lo_addr - 6 : 0;
|
|
per_info.control_regs.words.cr[0]
|
|
|= (PER_EVENT_BRANCH
|
|
| PER_EVENT_IFETCH
|
|
| PER_CONTROL_BRANCH_ADDRESS);
|
|
}
|
|
}
|
|
}
|
|
per_info.starting_addr = watch_lo_addr;
|
|
per_info.ending_addr = watch_hi_addr;
|
|
|
|
if (ptrace (PTRACE_POKEUSR_AREA, tid, &parea, 0) < 0)
|
|
perror_with_name (_("Couldn't modify watchpoint status"));
|
|
|
|
if (show_debug_regs)
|
|
s390_show_debug_regs (tid, "resume");
|
|
}
|
|
|
|
/* Mark the PER info as changed, so the next resume will update it. */
|
|
|
|
static void
|
|
s390_mark_per_info_changed (struct lwp_info *lp)
|
|
{
|
|
if (lwp_arch_private_info (lp) == NULL)
|
|
lwp_set_arch_private_info (lp, XCNEW (struct arch_lwp_info));
|
|
|
|
lwp_arch_private_info (lp)->per_info_changed = 1;
|
|
}
|
|
|
|
/* When attaching to a new thread, mark its PER info as changed. */
|
|
|
|
void
|
|
s390_linux_nat_target::low_new_thread (struct lwp_info *lp)
|
|
{
|
|
s390_mark_per_info_changed (lp);
|
|
}
|
|
|
|
/* Function to call when a thread is being deleted. */
|
|
|
|
void
|
|
s390_linux_nat_target::low_delete_thread (struct arch_lwp_info *arch_lwp)
|
|
{
|
|
xfree (arch_lwp);
|
|
}
|
|
|
|
/* Iterator callback for s390_refresh_per_info. */
|
|
|
|
static int
|
|
s390_refresh_per_info_cb (struct lwp_info *lp)
|
|
{
|
|
s390_mark_per_info_changed (lp);
|
|
|
|
if (!lwp_is_stopped (lp))
|
|
linux_stop_lwp (lp);
|
|
return 0;
|
|
}
|
|
|
|
/* Make sure that threads are stopped and mark PER info as changed. */
|
|
|
|
static int
|
|
s390_refresh_per_info (void)
|
|
{
|
|
ptid_t pid_ptid = ptid_t (current_lwp_ptid ().pid ());
|
|
|
|
iterate_over_lwps (pid_ptid, s390_refresh_per_info_cb);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
s390_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len,
|
|
enum target_hw_bp_type type,
|
|
struct expression *cond)
|
|
{
|
|
s390_watch_area area;
|
|
struct s390_debug_reg_state *state
|
|
= s390_get_debug_reg_state (inferior_ptid.pid ());
|
|
|
|
area.lo_addr = addr;
|
|
area.hi_addr = addr + len - 1;
|
|
VEC_safe_push (s390_watch_area, state->watch_areas, &area);
|
|
|
|
return s390_refresh_per_info ();
|
|
}
|
|
|
|
int
|
|
s390_linux_nat_target::remove_watchpoint (CORE_ADDR addr, int len,
|
|
enum target_hw_bp_type type,
|
|
struct expression *cond)
|
|
{
|
|
unsigned ix;
|
|
s390_watch_area *area;
|
|
struct s390_debug_reg_state *state
|
|
= s390_get_debug_reg_state (inferior_ptid.pid ());
|
|
|
|
for (ix = 0;
|
|
VEC_iterate (s390_watch_area, state->watch_areas, ix, area);
|
|
ix++)
|
|
{
|
|
if (area->lo_addr == addr && area->hi_addr == addr + len - 1)
|
|
{
|
|
VEC_unordered_remove (s390_watch_area, state->watch_areas, ix);
|
|
return s390_refresh_per_info ();
|
|
}
|
|
}
|
|
|
|
fprintf_unfiltered (gdb_stderr,
|
|
"Attempt to remove nonexistent watchpoint.\n");
|
|
return -1;
|
|
}
|
|
|
|
/* Implement the "can_use_hw_breakpoint" target_ops method. */
|
|
|
|
int
|
|
s390_linux_nat_target::can_use_hw_breakpoint (enum bptype type,
|
|
int cnt, int othertype)
|
|
{
|
|
if (type == bp_hardware_watchpoint || type == bp_hardware_breakpoint)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Implement the "insert_hw_breakpoint" target_ops method. */
|
|
|
|
int
|
|
s390_linux_nat_target::insert_hw_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
s390_watch_area area;
|
|
struct s390_debug_reg_state *state;
|
|
|
|
area.lo_addr = bp_tgt->placed_address = bp_tgt->reqstd_address;
|
|
area.hi_addr = area.lo_addr;
|
|
state = s390_get_debug_reg_state (inferior_ptid.pid ());
|
|
VEC_safe_push (s390_watch_area, state->break_areas, &area);
|
|
|
|
return s390_refresh_per_info ();
|
|
}
|
|
|
|
/* Implement the "remove_hw_breakpoint" target_ops method. */
|
|
|
|
int
|
|
s390_linux_nat_target::remove_hw_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
unsigned ix;
|
|
struct watch_area *area;
|
|
struct s390_debug_reg_state *state;
|
|
|
|
state = s390_get_debug_reg_state (inferior_ptid.pid ());
|
|
for (ix = 0;
|
|
VEC_iterate (s390_watch_area, state->break_areas, ix, area);
|
|
ix++)
|
|
{
|
|
if (area->lo_addr == bp_tgt->placed_address)
|
|
{
|
|
VEC_unordered_remove (s390_watch_area, state->break_areas, ix);
|
|
return s390_refresh_per_info ();
|
|
}
|
|
}
|
|
|
|
fprintf_unfiltered (gdb_stderr,
|
|
"Attempt to remove nonexistent breakpoint.\n");
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
s390_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int cnt)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
s390_target_wordsize (void)
|
|
{
|
|
int wordsize = 4;
|
|
|
|
/* Check for 64-bit inferior process. This is the case when the host is
|
|
64-bit, and in addition bit 32 of the PSW mask is set. */
|
|
#ifdef __s390x__
|
|
long pswm;
|
|
|
|
errno = 0;
|
|
pswm = (long) ptrace (PTRACE_PEEKUSER, s390_inferior_tid (), PT_PSWMASK, 0);
|
|
if (errno == 0 && (pswm & 0x100000000ul) != 0)
|
|
wordsize = 8;
|
|
#endif
|
|
|
|
return wordsize;
|
|
}
|
|
|
|
int
|
|
s390_linux_nat_target::auxv_parse (gdb_byte **readptr,
|
|
gdb_byte *endptr, CORE_ADDR *typep,
|
|
CORE_ADDR *valp)
|
|
{
|
|
int sizeof_auxv_field = s390_target_wordsize ();
|
|
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
|
|
gdb_byte *ptr = *readptr;
|
|
|
|
if (endptr == ptr)
|
|
return 0;
|
|
|
|
if (endptr - ptr < sizeof_auxv_field * 2)
|
|
return -1;
|
|
|
|
*typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
|
|
ptr += sizeof_auxv_field;
|
|
*valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order);
|
|
ptr += sizeof_auxv_field;
|
|
|
|
*readptr = ptr;
|
|
return 1;
|
|
}
|
|
|
|
const struct target_desc *
|
|
s390_linux_nat_target::read_description ()
|
|
{
|
|
int tid = s390_inferior_tid ();
|
|
|
|
have_regset_last_break
|
|
= check_regset (tid, NT_S390_LAST_BREAK, 8);
|
|
have_regset_system_call
|
|
= check_regset (tid, NT_S390_SYSTEM_CALL, 4);
|
|
|
|
/* If GDB itself is compiled as 64-bit, we are running on a machine in
|
|
z/Architecture mode. If the target is running in 64-bit addressing
|
|
mode, report s390x architecture. If the target is running in 31-bit
|
|
addressing mode, but the kernel supports using 64-bit registers in
|
|
that mode, report s390 architecture with 64-bit GPRs. */
|
|
#ifdef __s390x__
|
|
{
|
|
CORE_ADDR hwcap = linux_get_hwcap (current_top_target ());
|
|
|
|
have_regset_tdb = (hwcap & HWCAP_S390_TE)
|
|
&& check_regset (tid, NT_S390_TDB, s390_sizeof_tdbregset);
|
|
|
|
have_regset_vxrs = (hwcap & HWCAP_S390_VX)
|
|
&& check_regset (tid, NT_S390_VXRS_LOW, 16 * 8)
|
|
&& check_regset (tid, NT_S390_VXRS_HIGH, 16 * 16);
|
|
|
|
have_regset_gs = (hwcap & HWCAP_S390_GS)
|
|
&& check_regset (tid, NT_S390_GS_CB, 4 * 8)
|
|
&& check_regset (tid, NT_S390_GS_BC, 4 * 8);
|
|
|
|
if (s390_target_wordsize () == 8)
|
|
return (have_regset_gs ? tdesc_s390x_gs_linux64 :
|
|
have_regset_vxrs ?
|
|
(have_regset_tdb ? tdesc_s390x_tevx_linux64 :
|
|
tdesc_s390x_vx_linux64) :
|
|
have_regset_tdb ? tdesc_s390x_te_linux64 :
|
|
have_regset_system_call ? tdesc_s390x_linux64v2 :
|
|
have_regset_last_break ? tdesc_s390x_linux64v1 :
|
|
tdesc_s390x_linux64);
|
|
|
|
if (hwcap & HWCAP_S390_HIGH_GPRS)
|
|
return (have_regset_gs ? tdesc_s390_gs_linux64 :
|
|
have_regset_vxrs ?
|
|
(have_regset_tdb ? tdesc_s390_tevx_linux64 :
|
|
tdesc_s390_vx_linux64) :
|
|
have_regset_tdb ? tdesc_s390_te_linux64 :
|
|
have_regset_system_call ? tdesc_s390_linux64v2 :
|
|
have_regset_last_break ? tdesc_s390_linux64v1 :
|
|
tdesc_s390_linux64);
|
|
}
|
|
#endif
|
|
|
|
/* If GDB itself is compiled as 31-bit, or if we're running a 31-bit inferior
|
|
on a 64-bit kernel that does not support using 64-bit registers in 31-bit
|
|
mode, report s390 architecture with 32-bit GPRs. */
|
|
return (have_regset_system_call? tdesc_s390_linux32v2 :
|
|
have_regset_last_break? tdesc_s390_linux32v1 :
|
|
tdesc_s390_linux32);
|
|
}
|
|
|
|
void
|
|
_initialize_s390_nat (void)
|
|
{
|
|
/* Register the target. */
|
|
linux_target = &the_s390_linux_nat_target;
|
|
add_inf_child_target (&the_s390_linux_nat_target);
|
|
|
|
/* A maintenance command to enable showing the PER state. */
|
|
add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
|
|
&show_debug_regs, _("\
|
|
Set whether to show the PER (debug) hardware state."), _("\
|
|
Show whether to show the PER (debug) hardware state."), _("\
|
|
Use \"on\" to enable, \"off\" to disable.\n\
|
|
If enabled, the PER state is shown after it is changed by GDB,\n\
|
|
and when the inferior triggers a breakpoint or watchpoint."),
|
|
NULL,
|
|
NULL,
|
|
&maintenance_set_cmdlist,
|
|
&maintenance_show_cmdlist);
|
|
}
|