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- /* Motorola m68k native support for GNU/Linux.
- Copyright (C) 1996-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "frame.h"
- #include "inferior.h"
- #include "language.h"
- #include "gdbcore.h"
- #include "regcache.h"
- #include "target.h"
- #include "linux-nat.h"
- #include "gdbarch.h"
- #include "m68k-tdep.h"
- #include <sys/dir.h>
- #include <signal.h>
- #include "nat/gdb_ptrace.h"
- #include <sys/user.h>
- #include <sys/ioctl.h>
- #include <fcntl.h>
- #include <sys/procfs.h>
- #ifdef HAVE_SYS_REG_H
- #include <sys/reg.h>
- #endif
- #include <sys/file.h>
- #include <sys/stat.h>
- #include "floatformat.h"
- /* Prototypes for supply_gregset etc. */
- #include "gregset.h"
- /* Defines ps_err_e, struct ps_prochandle. */
- #include "gdb_proc_service.h"
- #include "inf-ptrace.h"
- #ifndef PTRACE_GET_THREAD_AREA
- #define PTRACE_GET_THREAD_AREA 25
- #endif
- class m68k_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;
- };
- static m68k_linux_nat_target the_m68k_linux_nat_target;
- /* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
- static const int regmap[] =
- {
- PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
- PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
- PT_SR, PT_PC,
- /* PT_FP0, ..., PT_FP7 */
- 21, 24, 27, 30, 33, 36, 39, 42,
- /* PT_FPCR, PT_FPSR, PT_FPIAR */
- 45, 46, 47
- };
- /* Which ptrace request retrieves which registers?
- These apply to the corresponding SET requests as well. */
- #define NUM_GREGS (18)
- #define MAX_NUM_REGS (NUM_GREGS + 11)
- static int
- getregs_supplies (int regno)
- {
- return 0 <= regno && regno < NUM_GREGS;
- }
- static int
- getfpregs_supplies (int regno)
- {
- return M68K_FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM;
- }
- /* Does the current host support the GETREGS request? */
- static int have_ptrace_getregs =
- #ifdef HAVE_PTRACE_GETREGS
- 1
- #else
- 0
- #endif
- ;
- /* Fetching registers directly from the U area, one at a time. */
- /* Fetch one register. */
- static void
- fetch_register (struct regcache *regcache, int regno)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- long regaddr, val;
- int i;
- gdb_byte buf[M68K_MAX_REGISTER_SIZE];
- pid_t tid = get_ptrace_pid (regcache->ptid ());
- regaddr = 4 * regmap[regno];
- for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
- {
- errno = 0;
- val = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
- memcpy (&buf[i], &val, sizeof (long));
- regaddr += sizeof (long);
- if (errno != 0)
- error (_("Couldn't read register %s (#%d): %s."),
- gdbarch_register_name (gdbarch, regno),
- regno, safe_strerror (errno));
- }
- regcache->raw_supply (regno, buf);
- }
- /* Fetch register values from the inferior.
- If REGNO is negative, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
- static void
- old_fetch_inferior_registers (struct regcache *regcache, int regno)
- {
- if (regno >= 0)
- {
- fetch_register (regcache, regno);
- }
- else
- {
- for (regno = 0;
- regno < gdbarch_num_regs (regcache->arch ());
- regno++)
- {
- fetch_register (regcache, regno);
- }
- }
- }
- /* Store one register. */
- static void
- store_register (const struct regcache *regcache, int regno)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- long regaddr, val;
- int i;
- gdb_byte buf[M68K_MAX_REGISTER_SIZE];
- pid_t tid = get_ptrace_pid (regcache->ptid ());
- regaddr = 4 * regmap[regno];
- /* Put the contents of regno into a local buffer. */
- regcache->raw_collect (regno, buf);
- /* Store the local buffer into the inferior a chunk at the time. */
- for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
- {
- errno = 0;
- memcpy (&val, &buf[i], sizeof (long));
- ptrace (PTRACE_POKEUSER, tid, regaddr, val);
- regaddr += sizeof (long);
- if (errno != 0)
- error (_("Couldn't write register %s (#%d): %s."),
- gdbarch_register_name (gdbarch, regno),
- regno, safe_strerror (errno));
- }
- }
- /* Store our register values back into the inferior.
- If REGNO is negative, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
- static void
- old_store_inferior_registers (const struct regcache *regcache, int regno)
- {
- if (regno >= 0)
- {
- store_register (regcache, regno);
- }
- else
- {
- for (regno = 0;
- regno < gdbarch_num_regs (regcache->arch ());
- regno++)
- {
- store_register (regcache, regno);
- }
- }
- }
- /* Given a pointer to a general register set in /proc format
- (elf_gregset_t *), unpack the register contents and supply
- them as gdb's idea of the current register values. */
- void
- supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
- int regi;
- for (regi = M68K_D0_REGNUM;
- regi <= gdbarch_sp_regnum (gdbarch);
- regi++)
- regcache->raw_supply (regi, ®p[regmap[regi]]);
- regcache->raw_supply (gdbarch_ps_regnum (gdbarch), ®p[PT_SR]);
- regcache->raw_supply (gdbarch_pc_regnum (gdbarch), ®p[PT_PC]);
- }
- /* Fill register REGNO (if it is a general-purpose register) in
- *GREGSETPS with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
- void
- fill_gregset (const struct regcache *regcache,
- elf_gregset_t *gregsetp, int regno)
- {
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
- int i;
- for (i = 0; i < NUM_GREGS; i++)
- if (regno == -1 || regno == i)
- regcache->raw_collect (i, regp + regmap[i]);
- }
- #ifdef HAVE_PTRACE_GETREGS
- /* Fetch all general-purpose registers from process/thread TID and
- store their values in GDB's register array. */
- static void
- fetch_regs (struct regcache *regcache, int tid)
- {
- elf_gregset_t regs;
- if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
- {
- if (errno == EIO)
- {
- /* The kernel we're running on doesn't support the GETREGS
- request. Reset `have_ptrace_getregs'. */
- have_ptrace_getregs = 0;
- return;
- }
- perror_with_name (_("Couldn't get registers"));
- }
- supply_gregset (regcache, (const elf_gregset_t *) ®s);
- }
- /* Store all valid general-purpose registers in GDB's register array
- into the process/thread specified by TID. */
- static void
- store_regs (const struct regcache *regcache, int tid, int regno)
- {
- elf_gregset_t regs;
- if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
- perror_with_name (_("Couldn't get registers"));
- fill_gregset (regcache, ®s, regno);
- if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
- perror_with_name (_("Couldn't write registers"));
- }
- #else
- static void fetch_regs (struct regcache *regcache, int tid)
- {
- }
- static void store_regs (const struct regcache *regcache, int tid, int regno)
- {
- }
- #endif
- /* Transfering floating-point registers between GDB, inferiors and cores. */
- /* What is the address of fpN within the floating-point register set F? */
- #define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
- /* Fill GDB's register array with the floating-point register values in
- *FPREGSETP. */
- void
- supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- int regi;
- for (regi = gdbarch_fp0_regnum (gdbarch);
- regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++)
- regcache->raw_supply
- (regi, FPREG_ADDR (fpregsetp, regi - gdbarch_fp0_regnum (gdbarch)));
- regcache->raw_supply (M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
- regcache->raw_supply (M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
- regcache->raw_supply (M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
- }
- /* Fill register REGNO (if it is a floating-point register) in
- *FPREGSETP with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
- void
- fill_fpregset (const struct regcache *regcache,
- elf_fpregset_t *fpregsetp, int regno)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- int i;
- /* Fill in the floating-point registers. */
- for (i = gdbarch_fp0_regnum (gdbarch);
- i < gdbarch_fp0_regnum (gdbarch) + 8; i++)
- if (regno == -1 || regno == i)
- regcache->raw_collect
- (i, FPREG_ADDR (fpregsetp, i - gdbarch_fp0_regnum (gdbarch)));
- /* Fill in the floating-point control registers. */
- for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
- if (regno == -1 || regno == i)
- regcache->raw_collect (i, &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
- }
- #ifdef HAVE_PTRACE_GETREGS
- /* Fetch all floating-point registers from process/thread TID and store
- thier values in GDB's register array. */
- static void
- fetch_fpregs (struct regcache *regcache, int tid)
- {
- elf_fpregset_t fpregs;
- if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
- perror_with_name (_("Couldn't get floating point status"));
- supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
- }
- /* Store all valid floating-point registers in GDB's register array
- into the process/thread specified by TID. */
- static void
- store_fpregs (const struct regcache *regcache, int tid, int regno)
- {
- elf_fpregset_t fpregs;
- if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
- perror_with_name (_("Couldn't get floating point status"));
- fill_fpregset (regcache, &fpregs, regno);
- if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
- perror_with_name (_("Couldn't write floating point status"));
- }
- #else
- static void fetch_fpregs (struct regcache *regcache, int tid)
- {
- }
- static void store_fpregs (const struct regcache *regcache, int tid, int regno)
- {
- }
- #endif
- /* Transferring arbitrary registers between GDB and inferior. */
- /* Fetch register REGNO from the child process. If REGNO is -1, do
- this for all registers (including the floating point and SSE
- registers). */
- void
- m68k_linux_nat_target::fetch_registers (struct regcache *regcache, int regno)
- {
- pid_t tid;
- /* Use the old method of peeking around in `struct user' if the
- GETREGS request isn't available. */
- if (! have_ptrace_getregs)
- {
- old_fetch_inferior_registers (regcache, regno);
- return;
- }
- tid = get_ptrace_pid (regcache->ptid ());
- /* Use the PTRACE_GETFPXREGS request whenever possible, since it
- transfers more registers in one system call, and we'll cache the
- results. But remember that fetch_fpxregs can fail, and return
- zero. */
- if (regno == -1)
- {
- fetch_regs (regcache, tid);
- /* The call above might reset `have_ptrace_getregs'. */
- if (! have_ptrace_getregs)
- {
- old_fetch_inferior_registers (regcache, -1);
- return;
- }
- fetch_fpregs (regcache, tid);
- return;
- }
- if (getregs_supplies (regno))
- {
- fetch_regs (regcache, tid);
- return;
- }
- if (getfpregs_supplies (regno))
- {
- fetch_fpregs (regcache, tid);
- return;
- }
- internal_error (__FILE__, __LINE__,
- _("Got request for bad register number %d."), regno);
- }
- /* Store register REGNO back into the child process. If REGNO is -1,
- do this for all registers (including the floating point and SSE
- registers). */
- void
- m68k_linux_nat_target::store_registers (struct regcache *regcache, int regno)
- {
- pid_t tid;
- /* Use the old method of poking around in `struct user' if the
- SETREGS request isn't available. */
- if (! have_ptrace_getregs)
- {
- old_store_inferior_registers (regcache, regno);
- return;
- }
- tid = get_ptrace_pid (regcache->ptid ());
- /* Use the PTRACE_SETFPREGS requests whenever possible, since it
- transfers more registers in one system call. But remember that
- store_fpregs can fail, and return zero. */
- if (regno == -1)
- {
- store_regs (regcache, tid, regno);
- store_fpregs (regcache, tid, regno);
- return;
- }
- if (getregs_supplies (regno))
- {
- store_regs (regcache, tid, regno);
- return;
- }
- if (getfpregs_supplies (regno))
- {
- store_fpregs (regcache, tid, regno);
- return;
- }
- internal_error (__FILE__, __LINE__,
- _("Got request to store bad register number %d."), regno);
- }
- /* Fetch the thread-local storage pointer for libthread_db. */
- ps_err_e
- ps_get_thread_area (struct ps_prochandle *ph,
- lwpid_t lwpid, int idx, void **base)
- {
- if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) < 0)
- return PS_ERR;
- /* IDX is the bias from the thread pointer to the beginning of the
- thread descriptor. It has to be subtracted due to implementation
- quirks in libthread_db. */
- *base = (char *) *base - idx;
- return PS_OK;
- }
- void _initialize_m68k_linux_nat ();
- void
- _initialize_m68k_linux_nat ()
- {
- /* Register the target. */
- linux_target = &the_m68k_linux_nat_target;
- add_inf_child_target (&the_m68k_linux_nat_target);
- }
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