/* Native-dependent code for GNU/Linux on MIPS processors.
- Copyright (C) 2001-2014 Free Software Foundation, Inc.
+ Copyright (C) 2001-2021 Free Software Foundation, Inc.
This file is part of GDB.
#include "mips-tdep.h"
#include "target.h"
#include "regcache.h"
-#include "linux-nat.h"
+#include "linux-nat-trad.h"
#include "mips-linux-tdep.h"
#include "target-descriptions.h"
#include "gregset.h"
#include <sgidefs.h>
-#include <sys/ptrace.h>
+#include "nat/gdb_ptrace.h"
#include <asm/ptrace.h>
+#include "inf-ptrace.h"
#include "nat/mips-linux-watch.h"
-#include "features/mips-linux.c"
-#include "features/mips-dsp-linux.c"
-#include "features/mips64-linux.c"
-#include "features/mips64-dsp-linux.c"
-
#ifndef PTRACE_GET_THREAD_AREA
#define PTRACE_GET_THREAD_AREA 25
#endif
-/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
- we'll clear this and use PTRACE_PEEKUSER instead. */
-static int have_ptrace_regsets = 1;
+class mips_linux_nat_target final : public linux_nat_trad_target
+{
+public:
+ /* Add our register access methods. */
+ void fetch_registers (struct regcache *, int) override;
+ void store_registers (struct regcache *, int) override;
+
+ void close () override;
+
+ int can_use_hw_breakpoint (enum bptype, int, int) override;
+
+ int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
+ struct expression *) override;
-/* Saved function pointers to fetch and store a single register using
- PTRACE_PEEKUSER and PTRACE_POKEUSER. */
+ int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
+ struct expression *) override;
-static void (*super_fetch_registers) (struct target_ops *,
- struct regcache *, int);
-static void (*super_store_registers) (struct target_ops *,
- struct regcache *, int);
+ bool stopped_by_watchpoint () override;
-static void (*super_close) (struct target_ops *);
+ bool stopped_data_address (CORE_ADDR *) override;
+
+ int region_ok_for_hw_watchpoint (CORE_ADDR, int) override;
+
+ const struct target_desc *read_description () override;
+
+protected:
+ /* Override linux_nat_trad_target methods. */
+ CORE_ADDR register_u_offset (struct gdbarch *gdbarch,
+ int regno, int store_p) override;
+
+ /* Override linux_nat_target low methods. */
+ void low_new_thread (struct lwp_info *lp) override;
+
+private:
+ /* Helpers. See definitions. */
+ void mips64_regsets_store_registers (struct regcache *regcache,
+ int regno);
+ void mips64_regsets_fetch_registers (struct regcache *regcache,
+ int regno);
+};
+
+static mips_linux_nat_target the_mips_linux_nat_target;
+
+/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
+ we'll clear this and use PTRACE_PEEKUSER instead. */
+static int have_ptrace_regsets = 1;
/* Map gdb internal register number to ptrace ``address''.
These ``addresses'' are normally defined in <asm/ptrace.h>.
if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))
error (_("Bogon register number %d."), regno);
+ /* On n32 we can't access 64-bit registers via PTRACE_PEEKUSR
+ or PTRACE_POKEUSR. */
+ if (register_size (gdbarch, regno) > sizeof (PTRACE_TYPE_RET))
+ return (CORE_ADDR) -1;
+
if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
regaddr = regno;
else if ((regno >= mips_regnum (gdbarch)->fp0)
/* Fetch the thread-local storage pointer for libthread_db. */
ps_err_e
-ps_get_thread_area (const struct ps_prochandle *ph,
- lwpid_t lwpid, int idx, void **base)
+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;
void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
- if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
+ if (mips_isa_regsize (regcache->arch ()) == 4)
mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
else
mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regno)
{
- if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
+ if (mips_isa_regsize (regcache->arch ()) == 4)
mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
else
mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
{
- if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
- mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
- else
- mips64_supply_fpregset (regcache,
- (const mips64_elf_fpregset_t *) fpregsetp);
+ mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
}
void
fill_fpregset (const struct regcache *regcache,
gdb_fpregset_t *fpregsetp, int regno)
{
- if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)
- mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
- else
- mips64_fill_fpregset (regcache,
- (mips64_elf_fpregset_t *) fpregsetp, regno);
+ mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
}
/* Fetch REGNO (or all registers if REGNO == -1) from the target
using PTRACE_GETREGS et al. */
-static void
-mips64_linux_regsets_fetch_registers (struct target_ops *ops,
- struct regcache *regcache, int regno)
+void
+mips_linux_nat_target::mips64_regsets_fetch_registers
+ (struct regcache *regcache, int regno)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch *gdbarch = regcache->arch ();
int is_fp, is_dsp;
int have_dsp;
int regi;
else
is_dsp = 0;
- tid = ptid_get_lwp (inferior_ptid);
- if (tid == 0)
- tid = ptid_get_pid (inferior_ptid);
+ tid = get_ptrace_pid (regcache->ptid ());
if (regno == -1 || (!is_fp && !is_dsp))
{
}
if (is_dsp)
- super_fetch_registers (ops, regcache, regno);
+ linux_nat_trad_target::fetch_registers (regcache, regno);
else if (regno == -1 && have_dsp)
{
for (regi = mips_regnum (gdbarch)->dspacc;
regi < mips_regnum (gdbarch)->dspacc + 6;
regi++)
- super_fetch_registers (ops, regcache, regi);
- super_fetch_registers (ops, regcache, mips_regnum (gdbarch)->dspctl);
+ linux_nat_trad_target::fetch_registers (regcache, regi);
+ linux_nat_trad_target::fetch_registers (regcache,
+ mips_regnum (gdbarch)->dspctl);
}
}
/* Store REGNO (or all registers if REGNO == -1) to the target
using PTRACE_SETREGS et al. */
-static void
-mips64_linux_regsets_store_registers (struct target_ops *ops,
- struct regcache *regcache, int regno)
+void
+mips_linux_nat_target::mips64_regsets_store_registers
+ (struct regcache *regcache, int regno)
{
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch *gdbarch = regcache->arch ();
int is_fp, is_dsp;
int have_dsp;
int regi;
else
is_dsp = 0;
- tid = ptid_get_lwp (inferior_ptid);
- if (tid == 0)
- tid = ptid_get_pid (inferior_ptid);
+ tid = get_ptrace_pid (regcache->ptid ());
if (regno == -1 || (!is_fp && !is_dsp))
{
}
if (is_dsp)
- super_store_registers (ops, regcache, regno);
+ linux_nat_trad_target::store_registers (regcache, regno);
else if (regno == -1 && have_dsp)
{
for (regi = mips_regnum (gdbarch)->dspacc;
regi < mips_regnum (gdbarch)->dspacc + 6;
regi++)
- super_store_registers (ops, regcache, regi);
- super_store_registers (ops, regcache, mips_regnum (gdbarch)->dspctl);
+ linux_nat_trad_target::store_registers (regcache, regi);
+ linux_nat_trad_target::store_registers (regcache,
+ mips_regnum (gdbarch)->dspctl);
}
}
/* Fetch REGNO (or all registers if REGNO == -1) from the target
using any working method. */
-static void
-mips64_linux_fetch_registers (struct target_ops *ops,
- struct regcache *regcache, int regnum)
+void
+mips_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
- mips64_linux_regsets_fetch_registers (ops, regcache, regnum);
+ mips64_regsets_fetch_registers (regcache, regnum);
/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
back to PTRACE_PEEKUSER. */
if (!have_ptrace_regsets)
- super_fetch_registers (ops, regcache, regnum);
+ {
+ linux_nat_trad_target::fetch_registers (regcache, regnum);
+
+ /* Fill the inaccessible zero register with zero. */
+ if (regnum == MIPS_ZERO_REGNUM || regnum == -1)
+ regcache->raw_supply_zeroed (MIPS_ZERO_REGNUM);
+ }
}
/* Store REGNO (or all registers if REGNO == -1) to the target
using any working method. */
-static void
-mips64_linux_store_registers (struct target_ops *ops,
- struct regcache *regcache, int regnum)
+void
+mips_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
{
/* Unless we already know that PTRACE_GETREGS does not work, try it. */
if (have_ptrace_regsets)
- mips64_linux_regsets_store_registers (ops, regcache, regnum);
+ mips64_regsets_store_registers (regcache, regnum);
/* If we know, or just found out, that PTRACE_GETREGS does not work, fall
back to PTRACE_PEEKUSER. */
if (!have_ptrace_regsets)
- super_store_registers (ops, regcache, regnum);
+ linux_nat_trad_target::store_registers (regcache, regnum);
}
/* Return the address in the core dump or inferior of register
REGNO. */
-static CORE_ADDR
-mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
+CORE_ADDR
+mips_linux_nat_target::register_u_offset (struct gdbarch *gdbarch,
+ int regno, int store_p)
{
if (mips_abi_regsize (gdbarch) == 8)
return mips64_linux_register_addr (gdbarch, regno, store_p);
return mips_linux_register_addr (gdbarch, regno, store_p);
}
-static const struct target_desc *
-mips_linux_read_description (struct target_ops *ops)
+const struct target_desc *
+mips_linux_nat_target::read_description ()
{
static int have_dsp = -1;
if (have_dsp < 0)
{
- int tid;
-
- tid = ptid_get_lwp (inferior_ptid);
- if (tid == 0)
- tid = ptid_get_pid (inferior_ptid);
+ int tid = get_ptrace_pid (inferior_ptid);
errno = 0;
ptrace (PTRACE_PEEKUSER, tid, DSP_CONTROL, 0);
/* Target to_can_use_hw_breakpoint implementation. Return 1 if we can
handle the specified watch type. */
-static int
-mips_linux_can_use_hw_breakpoint (struct target_ops *self,
- int type, int cnt, int ot)
+int
+mips_linux_nat_target::can_use_hw_breakpoint (enum bptype type,
+ int cnt, int ot)
{
int i;
uint32_t wanted_mask, irw_mask;
- if (!mips_linux_read_watch_registers (ptid_get_lwp (inferior_ptid),
+ if (!mips_linux_read_watch_registers (inferior_ptid.lwp (),
&watch_readback,
&watch_readback_valid, 0))
return 0;
stopped by watchpoint. The watchhi R and W bits indicate the watch
register triggered. */
-static int
-mips_linux_stopped_by_watchpoint (struct target_ops *ops)
+bool
+mips_linux_nat_target::stopped_by_watchpoint ()
{
int n;
int num_valid;
- if (!mips_linux_read_watch_registers (ptid_get_lwp (inferior_ptid),
+ if (!mips_linux_read_watch_registers (inferior_ptid.lwp (),
&watch_readback,
&watch_readback_valid, 1))
- return 0;
+ return false;
num_valid = mips_linux_watch_get_num_valid (&watch_readback);
for (n = 0; n < MAX_DEBUG_REGISTER && n < num_valid; n++)
if (mips_linux_watch_get_watchhi (&watch_readback, n) & (R_MASK | W_MASK))
- return 1;
+ return true;
- return 0;
+ return false;
}
/* Target to_stopped_data_address implementation. Set the address
where the watch triggered (if known). Return 1 if the address was
known. */
-static int
-mips_linux_stopped_data_address (struct target_ops *t, CORE_ADDR *paddr)
+bool
+mips_linux_nat_target::stopped_data_address (CORE_ADDR *paddr)
{
/* On mips we don't know the low order 3 bits of the data address,
so we must return false. */
- return 0;
+ return false;
}
/* Target to_region_ok_for_hw_watchpoint implementation. Return 1 if
the specified region can be covered by the watch registers. */
-static int
-mips_linux_region_ok_for_hw_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len)
+int
+mips_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
{
struct pt_watch_regs dummy_regs;
int i;
- if (!mips_linux_read_watch_registers (ptid_get_lwp (inferior_ptid),
+ if (!mips_linux_read_watch_registers (inferior_ptid.lwp (),
&watch_readback,
&watch_readback_valid, 0))
return 0;
ALL_LWPS (lp)
{
- tid = ptid_get_lwp (lp->ptid);
- if (ptrace (PTRACE_SET_WATCH_REGS, tid, &watch_mirror) == -1)
+ tid = lp->ptid.lwp ();
+ if (ptrace (PTRACE_SET_WATCH_REGS, tid, &watch_mirror, NULL) == -1)
perror_with_name (_("Couldn't write debug register"));
}
return 0;
}
-/* linux_nat new_thread implementation. Write the mirrored watch
- register values for the new thread. */
+/* linux_nat_target::low_new_thread implementation. Write the
+ mirrored watch register values for the new thread. */
-static void
-mips_linux_new_thread (struct lwp_info *lp)
+void
+mips_linux_nat_target::low_new_thread (struct lwp_info *lp)
{
- int tid;
+ long tid = lp->ptid.lwp ();
- if (!mips_linux_read_watch_registers (ptid_get_lwp (inferior_ptid),
+ if (!mips_linux_read_watch_registers (tid,
&watch_readback,
&watch_readback_valid, 0))
return;
- tid = ptid_get_lwp (lp->ptid);
- if (ptrace (PTRACE_SET_WATCH_REGS, tid, &watch_mirror) == -1)
+ if (ptrace (PTRACE_SET_WATCH_REGS, tid, &watch_mirror, NULL) == -1)
perror_with_name (_("Couldn't write debug register"));
}
/* Target to_insert_watchpoint implementation. Try to insert a new
watch. Return zero on success. */
-static int
-mips_linux_insert_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len, int type,
- struct expression *cond)
+int
+mips_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len,
+ enum target_hw_bp_type type,
+ struct expression *cond)
{
struct pt_watch_regs regs;
struct mips_watchpoint *new_watch;
struct mips_watchpoint **pw;
- int i;
int retval;
- if (!mips_linux_read_watch_registers (ptid_get_lwp (inferior_ptid),
+ if (!mips_linux_read_watch_registers (inferior_ptid.lwp (),
&watch_readback,
&watch_readback_valid, 0))
return -1;
return -1;
/* It fit. Stick it on the end of the list. */
- new_watch = (struct mips_watchpoint *)
- xmalloc (sizeof (struct mips_watchpoint));
+ new_watch = XNEW (struct mips_watchpoint);
new_watch->addr = addr;
new_watch->len = len;
new_watch->type = type;
/* Target to_remove_watchpoint implementation. Try to remove a watch.
Return zero on success. */
-static int
-mips_linux_remove_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len, int type,
- struct expression *cond)
+int
+mips_linux_nat_target::remove_watchpoint (CORE_ADDR addr, int len,
+ enum target_hw_bp_type type,
+ struct expression *cond)
{
int retval;
int deleted_one;
/* Target to_close implementation. Free any watches and call the
super implementation. */
-static void
-mips_linux_close (struct target_ops *self)
+void
+mips_linux_nat_target::close ()
{
struct mips_watchpoint *w;
struct mips_watchpoint *nw;
}
current_watches = NULL;
- if (super_close)
- super_close (self);
+ linux_nat_trad_target::close ();
}
-void _initialize_mips_linux_nat (void);
-
+void _initialize_mips_linux_nat ();
void
-_initialize_mips_linux_nat (void)
+_initialize_mips_linux_nat ()
{
- struct target_ops *t;
-
add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
&show_debug_regs, _("\
Set whether to show variables that mirror the mips debug registers."), _("\
&maintenance_set_cmdlist,
&maintenance_show_cmdlist);
- t = linux_trad_target (mips_linux_register_u_offset);
-
- super_close = t->to_close;
- t->to_close = mips_linux_close;
-
- super_fetch_registers = t->to_fetch_registers;
- super_store_registers = t->to_store_registers;
-
- t->to_fetch_registers = mips64_linux_fetch_registers;
- t->to_store_registers = mips64_linux_store_registers;
-
- t->to_can_use_hw_breakpoint = mips_linux_can_use_hw_breakpoint;
- t->to_remove_watchpoint = mips_linux_remove_watchpoint;
- t->to_insert_watchpoint = mips_linux_insert_watchpoint;
- t->to_stopped_by_watchpoint = mips_linux_stopped_by_watchpoint;
- t->to_stopped_data_address = mips_linux_stopped_data_address;
- t->to_region_ok_for_hw_watchpoint = mips_linux_region_ok_for_hw_watchpoint;
-
- t->to_read_description = mips_linux_read_description;
-
- linux_nat_add_target (t);
- linux_nat_set_new_thread (t, mips_linux_new_thread);
-
- /* Initialize the standard target descriptions. */
- initialize_tdesc_mips_linux ();
- initialize_tdesc_mips_dsp_linux ();
- initialize_tdesc_mips64_linux ();
- initialize_tdesc_mips64_dsp_linux ();
+ linux_target = &the_mips_linux_nat_target;
+ add_inf_child_target (&the_mips_linux_nat_target);
}
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