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117 lines
3.3 KiB
117 lines
3.3 KiB
4 months ago
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/* Fetch live process registers from TID.
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Copyright (C) 2013 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdlib.h>
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#if defined(__powerpc__) && defined(__linux__)
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# include <sys/ptrace.h>
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# include <asm/ptrace.h>
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# include <sys/user.h>
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#endif
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#include "system.h"
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#define BACKEND ppc_
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#include "libebl_CPU.h"
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bool
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ppc_dwarf_to_regno (Ebl *ebl __attribute__ ((unused)), unsigned *regno)
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{
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switch (*regno)
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{
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case 108:
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// LR uses both 65 and 108 numbers, there is no consistency for it.
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*regno = 65;
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return true;
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case 0 ... 107:
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case 109 ... (114 - 1) -1:
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return true;
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case 1200 ... 1231:
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*regno = *regno - 1200 + (114 - 1);
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return true;
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default:
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return false;
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}
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abort ();
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}
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__typeof (ppc_dwarf_to_regno)
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ppc64_dwarf_to_regno
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__attribute__ ((alias ("ppc_dwarf_to_regno")));
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bool
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ppc_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
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ebl_tid_registers_t *setfunc __attribute__ ((unused)),
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void *arg __attribute__ ((unused)))
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{
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#if !defined(__powerpc__) || !defined(__linux__)
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return false;
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#else /* __powerpc__ */
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union
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{
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struct pt_regs r;
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long l[sizeof (struct pt_regs) / sizeof (long)];
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}
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user_regs;
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eu_static_assert (sizeof (struct pt_regs) % sizeof (long) == 0);
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/* PTRACE_GETREGS is EIO on kernel-2.6.18-308.el5.ppc64. */
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errno = 0;
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for (unsigned regno = 0; regno < sizeof (user_regs) / sizeof (long);
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regno++)
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{
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user_regs.l[regno] = ptrace (PTRACE_PEEKUSER, tid,
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(void *) (uintptr_t) (regno
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* sizeof (long)),
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NULL);
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if (errno != 0)
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return false;
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}
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#define GPRS (sizeof (user_regs.r.gpr) / sizeof (*user_regs.r.gpr))
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Dwarf_Word dwarf_regs[GPRS];
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for (unsigned gpr = 0; gpr < GPRS; gpr++)
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dwarf_regs[gpr] = user_regs.r.gpr[gpr];
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if (! setfunc (0, GPRS, dwarf_regs, arg))
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return false;
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dwarf_regs[0] = user_regs.r.link;
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// LR uses both 65 and 108 numbers, there is no consistency for it.
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if (! setfunc (65, 1, dwarf_regs, arg))
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return false;
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/* Registers like msr, ctr, xer, dar, dsisr etc. are probably irrelevant
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for CFI. */
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dwarf_regs[0] = user_regs.r.nip;
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return setfunc (-1, 1, dwarf_regs, arg);
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#endif /* __powerpc__ */
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}
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__typeof (ppc_set_initial_registers_tid)
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ppc64_set_initial_registers_tid
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__attribute__ ((alias ("ppc_set_initial_registers_tid")));
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