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binutils-gdb/gdb/xtensa-linux-nat.c
Joel Brobecker 4a94e36819 Automatic Copyright Year update after running gdb/copyright.py 
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as per GDB's Start of New Year Procedure.

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performed by the script.
2022-01-01 19:13:23 +04:00

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/* Xtensa GNU/Linux native support.
Copyright (C) 2007-2022 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 "gdbcore.h"
#include "regcache.h"
#include "target.h"
#include "linux-nat.h"
#include <sys/types.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include "gdbsupport/gdb_wait.h"
#include <fcntl.h>
#include <sys/procfs.h>
#include "nat/gdb_ptrace.h"
#include <asm/ptrace.h>
#include "gregset.h"
#include "xtensa-tdep.h"
/* Defines ps_err_e, struct ps_prochandle. */
#include "gdb_proc_service.h"
/* Extended register set depends on hardware configs.
Keeping these definitions separately allows to introduce
hardware-specific overlays. */
#include "xtensa-xtregs.c"
class xtensa_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 xtensa_linux_nat_target the_xtensa_linux_nat_target;
void
fill_gregset (const struct regcache *regcache,
gdb_gregset_t *gregsetp, int regnum)
{
int i;
xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
struct gdbarch *gdbarch = regcache->arch ();
xtensa_gdbarch_tdep *tdep = (xtensa_gdbarch_tdep *) gdbarch_tdep (gdbarch);
if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
regcache->raw_collect (gdbarch_pc_regnum (gdbarch), &regs->pc);
if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
regcache->raw_collect (gdbarch_ps_regnum (gdbarch), &regs->ps);
if (regnum == tdep->wb_regnum || regnum == -1)
regcache->raw_collect (tdep->wb_regnum,
&regs->windowbase);
if (regnum == tdep->ws_regnum || regnum == -1)
regcache->raw_collect (tdep->ws_regnum,
&regs->windowstart);
if (regnum == tdep->lbeg_regnum || regnum == -1)
regcache->raw_collect (tdep->lbeg_regnum,
&regs->lbeg);
if (regnum == tdep->lend_regnum || regnum == -1)
regcache->raw_collect (tdep->lend_regnum,
&regs->lend);
if (regnum == tdep->lcount_regnum || regnum == -1)
regcache->raw_collect (tdep->lcount_regnum,
&regs->lcount);
if (regnum == tdep->sar_regnum || regnum == -1)
regcache->raw_collect (tdep->sar_regnum,
&regs->sar);
if (regnum == tdep->threadptr_regnum || regnum == -1)
regcache->raw_collect (tdep->threadptr_regnum,
&regs->threadptr);
if (regnum >=tdep->ar_base
&& regnum < tdep->ar_base
+ tdep->num_aregs)
regcache->raw_collect (regnum,
&regs->ar[regnum - tdep->ar_base]);
else if (regnum == -1)
{
for (i = 0; i < tdep->num_aregs; ++i)
regcache->raw_collect (tdep->ar_base + i,
&regs->ar[i]);
}
if (regnum >= tdep->a0_base
&& regnum < tdep->a0_base + C0_NREGS)
regcache->raw_collect (regnum,
&regs->ar[(4 * regs->windowbase + regnum
- tdep->a0_base)
% tdep->num_aregs]);
else if (regnum == -1)
{
for (i = 0; i < C0_NREGS; ++i)
regcache->raw_collect (tdep->a0_base + i,
(&regs->ar[(4 * regs->windowbase + i)
% tdep->num_aregs]));
}
}
static void
supply_gregset_reg (struct regcache *regcache,
const gdb_gregset_t *gregsetp, int regnum)
{
int i;
xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
struct gdbarch *gdbarch = regcache->arch ();
xtensa_gdbarch_tdep *tdep = (xtensa_gdbarch_tdep *) gdbarch_tdep (gdbarch);
if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
regcache->raw_supply (gdbarch_pc_regnum (gdbarch), &regs->pc);
if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
regcache->raw_supply (gdbarch_ps_regnum (gdbarch), &regs->ps);
if (regnum == tdep->wb_regnum || regnum == -1)
regcache->raw_supply (tdep->wb_regnum,
&regs->windowbase);
if (regnum == tdep->ws_regnum || regnum == -1)
regcache->raw_supply (tdep->ws_regnum,
&regs->windowstart);
if (regnum == tdep->lbeg_regnum || regnum == -1)
regcache->raw_supply (tdep->lbeg_regnum,
&regs->lbeg);
if (regnum == tdep->lend_regnum || regnum == -1)
regcache->raw_supply (tdep->lend_regnum,
&regs->lend);
if (regnum == tdep->lcount_regnum || regnum == -1)
regcache->raw_supply (tdep->lcount_regnum,
&regs->lcount);
if (regnum == tdep->sar_regnum || regnum == -1)
regcache->raw_supply (tdep->sar_regnum,
&regs->sar);
if (regnum == tdep->threadptr_regnum || regnum == -1)
regcache->raw_supply (tdep->threadptr_regnum,
&regs->threadptr);
if (regnum >=tdep->ar_base
&& regnum < tdep->ar_base
+ tdep->num_aregs)
regcache->raw_supply (regnum,
&regs->ar[regnum - tdep->ar_base]);
else if (regnum == -1)
{
for (i = 0; i < tdep->num_aregs; ++i)
regcache->raw_supply (tdep->ar_base + i,
&regs->ar[i]);
}
if (regnum >= tdep->a0_base
&& regnum < tdep->a0_base + C0_NREGS)
regcache->raw_supply (regnum,
&regs->ar[(4 * regs->windowbase + regnum
- tdep->a0_base)
% tdep->num_aregs]);
else if (regnum == -1)
{
for (i = 0; i < C0_NREGS; ++i)
regcache->raw_supply (tdep->a0_base + i,
&regs->ar[(4 * regs->windowbase + i)
% tdep->num_aregs]);
}
}
void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
supply_gregset_reg (regcache, gregsetp, -1);
}
void
fill_fpregset (const struct regcache *regcache,
gdb_fpregset_t *fpregsetp, int regnum)
{
return;
}
void
supply_fpregset (struct regcache *regcache,
const gdb_fpregset_t *fpregsetp)
{
return;
}
/* Fetch greg-register(s) from process/thread TID
and store value(s) in GDB's register array. */
static void
fetch_gregs (struct regcache *regcache, int regnum)
{
int tid = regcache->ptid ().lwp ();
gdb_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
{
perror_with_name (_("Couldn't get registers"));
return;
}
supply_gregset_reg (regcache, &regs, regnum);
}
/* Store greg-register(s) in GDB's register
array into the process/thread specified by TID. */
static void
store_gregs (struct regcache *regcache, int regnum)
{
int tid = regcache->ptid ().lwp ();
gdb_gregset_t regs;
if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
{
perror_with_name (_("Couldn't get registers"));
return;
}
fill_gregset (regcache, &regs, regnum);
if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
{
perror_with_name (_("Couldn't write registers"));
return;
}
}
static int xtreg_lo;
static int xtreg_high;
/* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
interface provides special requests for this. */
static void
fetch_xtregs (struct regcache *regcache, int regnum)
{
int tid = regcache->ptid ().lwp ();
const xtensa_regtable_t *ptr;
char xtregs [XTENSA_ELF_XTREG_SIZE];
if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
perror_with_name (_("Couldn't get extended registers"));
for (ptr = xtensa_regmap_table; ptr->name; ptr++)
if (regnum == ptr->gdb_regnum || regnum == -1)
regcache->raw_supply (ptr->gdb_regnum, xtregs + ptr->ptrace_offset);
}
static void
store_xtregs (struct regcache *regcache, int regnum)
{
int tid = regcache->ptid ().lwp ();
const xtensa_regtable_t *ptr;
char xtregs [XTENSA_ELF_XTREG_SIZE];
if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
perror_with_name (_("Couldn't get extended registers"));
for (ptr = xtensa_regmap_table; ptr->name; ptr++)
if (regnum == ptr->gdb_regnum || regnum == -1)
regcache->raw_collect (ptr->gdb_regnum, xtregs + ptr->ptrace_offset);
if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
perror_with_name (_("Couldn't write extended registers"));
}
void
xtensa_linux_nat_target::fetch_registers (struct regcache *regcache,
int regnum)
{
if (regnum == -1)
{
fetch_gregs (regcache, regnum);
fetch_xtregs (regcache, regnum);
}
else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
fetch_gregs (regcache, regnum);
else
fetch_xtregs (regcache, regnum);
}
void
xtensa_linux_nat_target::store_registers (struct regcache *regcache,
int regnum)
{
if (regnum == -1)
{
store_gregs (regcache, regnum);
store_xtregs (regcache, regnum);
}
else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
store_gregs (regcache, regnum);
else
store_xtregs (regcache, regnum);
}
/* Called by libthread_db. */
ps_err_e
ps_get_thread_area (struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
xtensa_elf_gregset_t regs;
if (ptrace (PTRACE_GETREGS, lwpid, NULL, &regs) != 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 = (void *) ((char *) regs.threadptr - idx);
return PS_OK;
}
void _initialize_xtensa_linux_nat ();
void
_initialize_xtensa_linux_nat ()
{
const xtensa_regtable_t *ptr;
/* Calculate the number range for extended registers. */
xtreg_lo = 1000000000;
xtreg_high = -1;
for (ptr = xtensa_regmap_table; ptr->name; ptr++)
{
if (ptr->gdb_regnum < xtreg_lo)
xtreg_lo = ptr->gdb_regnum;
if (ptr->gdb_regnum > xtreg_high)
xtreg_high = ptr->gdb_regnum;
}
linux_target = &the_xtensa_linux_nat_target;
add_inf_child_target (&the_xtensa_linux_nat_target);
}
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