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- /* S390 native-dependent code for GDB, the GNU debugger.
- Copyright (C) 2001-2022 Free Software Foundation, Inc.
- Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
- 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 "regcache.h"
- #include "inferior.h"
- #include "target.h"
- #include "linux-nat.h"
- #include "auxv.h"
- #include "gregset.h"
- #include "regset.h"
- #include "nat/linux-ptrace.h"
- #include "gdbcmd.h"
- #include "gdbarch.h"
- #include "s390-tdep.h"
- #include "s390-linux-tdep.h"
- #include "elf/common.h"
- #include <asm/ptrace.h>
- #include "nat/gdb_ptrace.h"
- #include <asm/types.h>
- #include <sys/procfs.h>
- #include <sys/ucontext.h>
- #include <elf.h>
- #include <algorithm>
- #include "inf-ptrace.h"
- #include "linux-tdep.h"
- /* Per-thread arch-specific data. */
- struct arch_lwp_info
- {
- /* Non-zero if the thread's PER info must be re-written. */
- int per_info_changed;
- };
- static int have_regset_last_break = 0;
- static int have_regset_system_call = 0;
- static int have_regset_tdb = 0;
- static int have_regset_vxrs = 0;
- static int have_regset_gs = 0;
- /* Register map for 32-bit executables running under a 64-bit
- kernel. */
- #ifdef __s390x__
- static const struct regcache_map_entry s390_64_regmap_gregset[] =
- {
- /* Skip PSWM and PSWA, since they must be handled specially. */
- { 2, REGCACHE_MAP_SKIP, 8 },
- { 1, S390_R0_UPPER_REGNUM, 4 }, { 1, S390_R0_REGNUM, 4 },
- { 1, S390_R1_UPPER_REGNUM, 4 }, { 1, S390_R1_REGNUM, 4 },
- { 1, S390_R2_UPPER_REGNUM, 4 }, { 1, S390_R2_REGNUM, 4 },
- { 1, S390_R3_UPPER_REGNUM, 4 }, { 1, S390_R3_REGNUM, 4 },
- { 1, S390_R4_UPPER_REGNUM, 4 }, { 1, S390_R4_REGNUM, 4 },
- { 1, S390_R5_UPPER_REGNUM, 4 }, { 1, S390_R5_REGNUM, 4 },
- { 1, S390_R6_UPPER_REGNUM, 4 }, { 1, S390_R6_REGNUM, 4 },
- { 1, S390_R7_UPPER_REGNUM, 4 }, { 1, S390_R7_REGNUM, 4 },
- { 1, S390_R8_UPPER_REGNUM, 4 }, { 1, S390_R8_REGNUM, 4 },
- { 1, S390_R9_UPPER_REGNUM, 4 }, { 1, S390_R9_REGNUM, 4 },
- { 1, S390_R10_UPPER_REGNUM, 4 }, { 1, S390_R10_REGNUM, 4 },
- { 1, S390_R11_UPPER_REGNUM, 4 }, { 1, S390_R11_REGNUM, 4 },
- { 1, S390_R12_UPPER_REGNUM, 4 }, { 1, S390_R12_REGNUM, 4 },
- { 1, S390_R13_UPPER_REGNUM, 4 }, { 1, S390_R13_REGNUM, 4 },
- { 1, S390_R14_UPPER_REGNUM, 4 }, { 1, S390_R14_REGNUM, 4 },
- { 1, S390_R15_UPPER_REGNUM, 4 }, { 1, S390_R15_REGNUM, 4 },
- { 16, S390_A0_REGNUM, 4 },
- { 1, REGCACHE_MAP_SKIP, 4 }, { 1, S390_ORIG_R2_REGNUM, 4 },
- { 0 }
- };
- static const struct regset s390_64_gregset =
- {
- s390_64_regmap_gregset,
- regcache_supply_regset,
- regcache_collect_regset
- };
- #define S390_PSWM_OFFSET 0
- #define S390_PSWA_OFFSET 8
- #endif
- /* PER-event mask bits and PER control bits (CR9). */
- #define PER_BIT(n) (1UL << (63 - (n)))
- #define PER_EVENT_BRANCH PER_BIT (32)
- #define PER_EVENT_IFETCH PER_BIT (33)
- #define PER_EVENT_STORE PER_BIT (34)
- #define PER_EVENT_NULLIFICATION PER_BIT (39)
- #define PER_CONTROL_BRANCH_ADDRESS PER_BIT (40)
- #define PER_CONTROL_SUSPENSION PER_BIT (41)
- #define PER_CONTROL_ALTERATION PER_BIT (42)
- class s390_linux_nat_target final : public linux_nat_target
- {
- public:
- /* Add our register access methods. */
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- /* Add our watchpoint methods. */
- int can_use_hw_breakpoint (enum bptype, int, int) override;
- int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *)
- override;
- int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *)
- override;
- int region_ok_for_hw_watchpoint (CORE_ADDR, int) override;
- bool stopped_by_watchpoint () override;
- int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
- struct expression *) override;
- int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
- struct expression *) override;
- /* Detect target architecture. */
- const struct target_desc *read_description () override;
- int auxv_parse (gdb_byte **readptr,
- gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
- override;
- /* Override linux_nat_target low methods. */
- void low_new_thread (struct lwp_info *lp) override;
- void low_delete_thread (struct arch_lwp_info *lp) override;
- void low_prepare_to_resume (struct lwp_info *lp) override;
- void low_new_fork (struct lwp_info *parent, pid_t child_pid) override;
- void low_forget_process (pid_t pid) override;
- };
- static s390_linux_nat_target the_s390_linux_nat_target;
- /* Fill GDB's register array with the general-purpose register values
- in *REGP.
- When debugging a 32-bit executable running under a 64-bit kernel,
- we have to fix up the 64-bit registers we get from the kernel to
- make them look like 32-bit registers. */
- void
- supply_gregset (struct regcache *regcache, const gregset_t *regp)
- {
- #ifdef __s390x__
- struct gdbarch *gdbarch = regcache->arch ();
- if (gdbarch_ptr_bit (gdbarch) == 32)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- ULONGEST pswm, pswa;
- gdb_byte buf[4];
- regcache_supply_regset (&s390_64_gregset, regcache, -1,
- regp, sizeof (gregset_t));
- pswm = extract_unsigned_integer ((const gdb_byte *) regp
- + S390_PSWM_OFFSET, 8, byte_order);
- pswa = extract_unsigned_integer ((const gdb_byte *) regp
- + S390_PSWA_OFFSET, 8, byte_order);
- store_unsigned_integer (buf, 4, byte_order, (pswm >> 32) | 0x80000);
- regcache->raw_supply (S390_PSWM_REGNUM, buf);
- store_unsigned_integer (buf, 4, byte_order,
- (pswa & 0x7fffffff) | (pswm & 0x80000000));
- regcache->raw_supply (S390_PSWA_REGNUM, buf);
- return;
- }
- #endif
- regcache_supply_regset (&s390_gregset, regcache, -1, regp,
- sizeof (gregset_t));
- }
- /* Fill register REGNO (if it is a general-purpose register) in
- *REGP with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
- void
- fill_gregset (const struct regcache *regcache, gregset_t *regp, int regno)
- {
- #ifdef __s390x__
- struct gdbarch *gdbarch = regcache->arch ();
- if (gdbarch_ptr_bit (gdbarch) == 32)
- {
- regcache_collect_regset (&s390_64_gregset, regcache, regno,
- regp, sizeof (gregset_t));
- if (regno == -1
- || regno == S390_PSWM_REGNUM || regno == S390_PSWA_REGNUM)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- ULONGEST pswa, pswm;
- gdb_byte buf[4];
- gdb_byte *pswm_p = (gdb_byte *) regp + S390_PSWM_OFFSET;
- gdb_byte *pswa_p = (gdb_byte *) regp + S390_PSWA_OFFSET;
- pswm = extract_unsigned_integer (pswm_p, 8, byte_order);
- if (regno == -1 || regno == S390_PSWM_REGNUM)
- {
- pswm &= 0x80000000;
- regcache->raw_collect (S390_PSWM_REGNUM, buf);
- pswm |= (extract_unsigned_integer (buf, 4, byte_order)
- & 0xfff7ffff) << 32;
- }
- if (regno == -1 || regno == S390_PSWA_REGNUM)
- {
- regcache->raw_collect (S390_PSWA_REGNUM, buf);
- pswa = extract_unsigned_integer (buf, 4, byte_order);
- pswm ^= (pswm ^ pswa) & 0x80000000;
- pswa &= 0x7fffffff;
- store_unsigned_integer (pswa_p, 8, byte_order, pswa);
- }
- store_unsigned_integer (pswm_p, 8, byte_order, pswm);
- }
- return;
- }
- #endif
- regcache_collect_regset (&s390_gregset, regcache, regno, regp,
- sizeof (gregset_t));
- }
- /* Fill GDB's register array with the floating-point register values
- in *REGP. */
- void
- supply_fpregset (struct regcache *regcache, const fpregset_t *regp)
- {
- regcache_supply_regset (&s390_fpregset, regcache, -1, regp,
- sizeof (fpregset_t));
- }
- /* Fill register REGNO (if it is a general-purpose register) in
- *REGP with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
- void
- fill_fpregset (const struct regcache *regcache, fpregset_t *regp, int regno)
- {
- regcache_collect_regset (&s390_fpregset, regcache, regno, regp,
- sizeof (fpregset_t));
- }
- /* Find the TID for the current inferior thread to use with ptrace. */
- static int
- s390_inferior_tid (void)
- {
- /* GNU/Linux LWP ID's are process ID's. */
- int tid = inferior_ptid.lwp ();
- if (tid == 0)
- tid = inferior_ptid.pid (); /* Not a threaded program. */
- return tid;
- }
- /* Fetch all general-purpose registers from process/thread TID and
- store their values in GDB's register cache. */
- static void
- fetch_regs (struct regcache *regcache, int tid)
- {
- gregset_t regs;
- ptrace_area parea;
- parea.len = sizeof (regs);
- parea.process_addr = (addr_t) ®s;
- parea.kernel_addr = offsetof (struct user_regs_struct, psw);
- if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
- perror_with_name (_("Couldn't get registers"));
- supply_gregset (regcache, (const gregset_t *) ®s);
- }
- /* Store all valid general-purpose registers in GDB's register cache
- into the process/thread specified by TID. */
- static void
- store_regs (const struct regcache *regcache, int tid, int regnum)
- {
- gregset_t regs;
- ptrace_area parea;
- parea.len = sizeof (regs);
- parea.process_addr = (addr_t) ®s;
- parea.kernel_addr = offsetof (struct user_regs_struct, psw);
- if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
- perror_with_name (_("Couldn't get registers"));
- fill_gregset (regcache, ®s, regnum);
- if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0)
- perror_with_name (_("Couldn't write registers"));
- }
- /* Fetch all floating-point registers from process/thread TID and store
- their values in GDB's register cache. */
- static void
- fetch_fpregs (struct regcache *regcache, int tid)
- {
- fpregset_t fpregs;
- ptrace_area parea;
- parea.len = sizeof (fpregs);
- parea.process_addr = (addr_t) &fpregs;
- parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
- if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
- perror_with_name (_("Couldn't get floating point status"));
- supply_fpregset (regcache, (const fpregset_t *) &fpregs);
- }
- /* Store all valid floating-point registers in GDB's register cache
- into the process/thread specified by TID. */
- static void
- store_fpregs (const struct regcache *regcache, int tid, int regnum)
- {
- fpregset_t fpregs;
- ptrace_area parea;
- parea.len = sizeof (fpregs);
- parea.process_addr = (addr_t) &fpregs;
- parea.kernel_addr = offsetof (struct user_regs_struct, fp_regs);
- if (ptrace (PTRACE_PEEKUSR_AREA, tid, (long) &parea, 0) < 0)
- perror_with_name (_("Couldn't get floating point status"));
- fill_fpregset (regcache, &fpregs, regnum);
- if (ptrace (PTRACE_POKEUSR_AREA, tid, (long) &parea, 0) < 0)
- perror_with_name (_("Couldn't write floating point status"));
- }
- /* Fetch all registers in the kernel's register set whose number is
- REGSET_ID, whose size is REGSIZE, and whose layout is described by
- REGSET, from process/thread TID and store their values in GDB's
- register cache. */
- static void
- fetch_regset (struct regcache *regcache, int tid,
- int regset_id, int regsize, const struct regset *regset)
- {
- void *buf = alloca (regsize);
- struct iovec iov;
- iov.iov_base = buf;
- iov.iov_len = regsize;
- if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0)
- {
- if (errno == ENODATA)
- regcache_supply_regset (regset, regcache, -1, NULL, regsize);
- else
- perror_with_name (_("Couldn't get register set"));
- }
- else
- regcache_supply_regset (regset, regcache, -1, buf, regsize);
- }
- /* Store all registers in the kernel's register set whose number is
- REGSET_ID, whose size is REGSIZE, and whose layout is described by
- REGSET, from GDB's register cache back to process/thread TID. */
- static void
- store_regset (struct regcache *regcache, int tid,
- int regset_id, int regsize, const struct regset *regset)
- {
- void *buf = alloca (regsize);
- struct iovec iov;
- iov.iov_base = buf;
- iov.iov_len = regsize;
- if (ptrace (PTRACE_GETREGSET, tid, (long) regset_id, (long) &iov) < 0)
- perror_with_name (_("Couldn't get register set"));
- regcache_collect_regset (regset, regcache, -1, buf, regsize);
- if (ptrace (PTRACE_SETREGSET, tid, (long) regset_id, (long) &iov) < 0)
- perror_with_name (_("Couldn't set register set"));
- }
- /* Check whether the kernel provides a register set with number REGSET
- of size REGSIZE for process/thread TID. */
- static int
- check_regset (int tid, int regset, int regsize)
- {
- void *buf = alloca (regsize);
- struct iovec iov;
- iov.iov_base = buf;
- iov.iov_len = regsize;
- if (ptrace (PTRACE_GETREGSET, tid, (long) regset, (long) &iov) >= 0
- || errno == ENODATA)
- return 1;
- return 0;
- }
- /* Fetch register REGNUM from the child process. If REGNUM is -1, do
- this for all registers. */
- void
- s390_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
- {
- pid_t tid = get_ptrace_pid (regcache->ptid ());
- if (regnum == -1 || S390_IS_GREGSET_REGNUM (regnum))
- fetch_regs (regcache, tid);
- if (regnum == -1 || S390_IS_FPREGSET_REGNUM (regnum))
- fetch_fpregs (regcache, tid);
- if (have_regset_last_break)
- if (regnum == -1 || regnum == S390_LAST_BREAK_REGNUM)
- fetch_regset (regcache, tid, NT_S390_LAST_BREAK, 8,
- (gdbarch_ptr_bit (regcache->arch ()) == 32
- ? &s390_last_break_regset : &s390x_last_break_regset));
- if (have_regset_system_call)
- if (regnum == -1 || regnum == S390_SYSTEM_CALL_REGNUM)
- fetch_regset (regcache, tid, NT_S390_SYSTEM_CALL, 4,
- &s390_system_call_regset);
- if (have_regset_tdb)
- if (regnum == -1 || S390_IS_TDBREGSET_REGNUM (regnum))
- fetch_regset (regcache, tid, NT_S390_TDB, s390_sizeof_tdbregset,
- &s390_tdb_regset);
- if (have_regset_vxrs)
- {
- 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. */
- struct watch_area
- {
- CORE_ADDR lo_addr;
- CORE_ADDR hi_addr;
- };
- /* Hardware debug state. */
- struct s390_debug_reg_state
- {
- std::vector<watch_area> watch_areas;
- std::vector<watch_area> break_areas;
- };
- /* Per-process data. */
- struct s390_process_info
- {
- struct s390_process_info *next = nullptr;
- pid_t pid = 0;
- 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 = new 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)
- {
- *proc_link = proc->next;
- delete 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 = parent_state->watch_areas;
- child_state->break_areas = 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 (state->watch_areas.empty ())
- 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;
- 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 || state->break_areas.empty ())
- 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 (!state->watch_areas.empty ())
- {
- for (const auto &area : state->watch_areas)
- {
- 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 (!state->break_areas.empty ())
- {
- /* 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 (const auto &area : state->break_areas)
- {
- 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)
- {
- 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;
- state->watch_areas.push_back (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;
- struct s390_debug_reg_state *state
- = s390_get_debug_reg_state (inferior_ptid.pid ());
- for (ix = 0; ix < state->watch_areas.size (); ix++)
- {
- watch_area &area = state->watch_areas[ix];
- if (area.lo_addr == addr && area.hi_addr == addr + len - 1)
- {
- unordered_remove (state->watch_areas, ix);
- return s390_refresh_per_info ();
- }
- }
- gdb_printf (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)
- {
- 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 ());
- state->break_areas.push_back (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 s390_debug_reg_state *state;
- state = s390_get_debug_reg_state (inferior_ptid.pid ());
- for (ix = 0; state->break_areas.size (); ix++)
- {
- watch_area &area = state->break_areas[ix];
- if (area.lo_addr == bp_tgt->placed_address)
- {
- unordered_remove (state->break_areas, ix);
- return s390_refresh_per_info ();
- }
- }
- gdb_printf (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 = inferior_ptid.pid ();
- 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_inferior ()->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
- _initialize_s390_nat ()
- {
- /* 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);
- }
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