329 lines
10 KiB
C
329 lines
10 KiB
C
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/* Native-dependent code for SPARC.
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Copyright (C) 2003-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "target.h"
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#include <signal.h>
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#include <sys/ptrace.h>
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#include "gdbsupport/gdb_wait.h"
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#ifdef HAVE_MACHINE_REG_H
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#include <machine/reg.h>
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#endif
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#include "sparc-tdep.h"
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#include "sparc-nat.h"
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#include "inf-ptrace.h"
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/* With some trickery we can use the code in this file for most (if
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not all) ptrace(2) based SPARC systems, which includes SunOS 4,
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GNU/Linux and the various SPARC BSD's.
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First, we need a data structure for use with ptrace(2). SunOS has
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`struct regs' and `struct fp_status' in <machine/reg.h>. BSD's
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have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux
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has the same structures as SunOS 4, but they're in <asm/reg.h>,
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which is a kernel header. As a general rule we avoid including
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GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t'
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and a `fpregset_t' that are equivalent to `struct regs' and `struct
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fp_status' in <sys/ucontext.h>, which is automatically included by
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<signal.h>. Settling on using the `gregset_t' and `fpregset_t'
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typedefs, providing them for the other systems, therefore solves
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the puzzle. */
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#ifdef HAVE_MACHINE_REG_H
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#ifdef HAVE_STRUCT_REG
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typedef struct reg gregset_t;
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typedef struct fpreg fpregset_t;
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#else
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typedef struct regs gregset_t;
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typedef struct fp_status fpregset_t;
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#endif
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#endif
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/* Second, we need to remap the BSD ptrace(2) requests to their SunOS
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equivalents. GNU/Linux already follows SunOS here. */
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#ifndef PTRACE_GETREGS
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#define PTRACE_GETREGS PT_GETREGS
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#endif
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#ifndef PTRACE_SETREGS
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#define PTRACE_SETREGS PT_SETREGS
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#endif
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#ifndef PTRACE_GETFPREGS
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#define PTRACE_GETFPREGS PT_GETFPREGS
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#endif
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#ifndef PTRACE_SETFPREGS
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#define PTRACE_SETFPREGS PT_SETFPREGS
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#endif
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/* Register set description. */
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const struct sparc_gregmap *sparc_gregmap;
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const struct sparc_fpregmap *sparc_fpregmap;
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void (*sparc_supply_gregset) (const struct sparc_gregmap *,
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struct regcache *, int , const void *);
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void (*sparc_collect_gregset) (const struct sparc_gregmap *,
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const struct regcache *, int, void *);
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void (*sparc_supply_fpregset) (const struct sparc_fpregmap *,
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struct regcache *, int , const void *);
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void (*sparc_collect_fpregset) (const struct sparc_fpregmap *,
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const struct regcache *, int , void *);
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int (*sparc_gregset_supplies_p) (struct gdbarch *, int);
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int (*sparc_fpregset_supplies_p) (struct gdbarch *, int);
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/* Determine whether `gregset_t' contains register REGNUM. */
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int
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sparc32_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
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{
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/* Integer registers. */
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if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
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|| (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
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|| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
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|| (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
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return 1;
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/* Control registers. */
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if (regnum == SPARC32_PC_REGNUM
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|| regnum == SPARC32_NPC_REGNUM
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|| regnum == SPARC32_PSR_REGNUM
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|| regnum == SPARC32_Y_REGNUM)
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return 1;
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return 0;
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}
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/* Determine whether `fpregset_t' contains register REGNUM. */
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int
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sparc32_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
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{
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/* Floating-point registers. */
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if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
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return 1;
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/* Control registers. */
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if (regnum == SPARC32_FSR_REGNUM)
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return 1;
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return 0;
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}
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/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
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for all registers (including the floating-point registers). */
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void
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sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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pid_t pid;
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/* NOTE: cagney/2002-12-03: This code assumes that the currently
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selected light weight processes' registers can be written
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directly into the selected thread's register cache. This works
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fine when given an 1:1 LWP:thread model (such as found on
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GNU/Linux) but will, likely, have problems when used on an N:1
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(userland threads) or N:M (userland multiple LWP) model. In the
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case of the latter two, the LWP's registers do not necessarily
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belong to the selected thread (the LWP could be in the middle of
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executing the thread switch code).
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These functions should instead be parameterized with an explicit
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object (struct regcache, struct thread_info?) into which the LWPs
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registers can be written. */
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pid = get_ptrace_pid (regcache->ptid ());
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if (regnum == SPARC_G0_REGNUM)
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{
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gdb_byte zero[8] = { 0 };
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regcache->raw_supply (SPARC_G0_REGNUM, &zero);
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return;
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}
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if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
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{
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gregset_t regs;
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if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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sparc_supply_gregset (sparc_gregmap, regcache, -1, ®s);
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum))
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{
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fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs);
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}
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}
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void
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sparc_store_inferior_registers (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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pid_t pid;
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/* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers
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about threaded assumptions. */
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pid = get_ptrace_pid (regcache->ptid ());
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if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
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{
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gregset_t regs;
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if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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sparc_collect_gregset (sparc_gregmap, regcache, regnum, ®s);
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if (ptrace (PTRACE_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't write registers"));
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/* Deal with the stack regs. */
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if (regnum == -1 || regnum == SPARC_SP_REGNUM
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|| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM))
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{
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ULONGEST sp;
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regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
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sparc_collect_rwindow (regcache, sp, regnum);
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}
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if (regnum != -1)
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return;
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}
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if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum))
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{
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fpregset_t fpregs, saved_fpregs;
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if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating-point registers"));
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memcpy (&saved_fpregs, &fpregs, sizeof (fpregs));
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sparc_collect_fpregset (sparc_fpregmap, regcache, regnum, &fpregs);
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/* Writing the floating-point registers will fail on NetBSD with
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EINVAL if the inferior process doesn't have an FPU state
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(i.e. if it didn't use the FPU yet). Therefore we don't try
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to write the registers if nothing changed. */
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if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0)
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{
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if (ptrace (PTRACE_SETFPREGS, pid,
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't write floating-point registers"));
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}
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if (regnum != -1)
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return;
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}
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}
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/* Implement the to_xfer_partial target_ops method for
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TARGET_OBJECT_WCOOKIE. Fetch StackGhost Per-Process XOR cookie. */
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enum target_xfer_status
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sparc_xfer_wcookie (enum target_object object,
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const char *annex, gdb_byte *readbuf,
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const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len)
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{
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unsigned long wcookie = 0;
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char *buf = (char *)&wcookie;
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gdb_assert (object == TARGET_OBJECT_WCOOKIE);
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gdb_assert (readbuf && writebuf == NULL);
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if (offset == sizeof (unsigned long))
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return TARGET_XFER_EOF; /* Signal EOF. */
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if (offset > sizeof (unsigned long))
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return TARGET_XFER_E_IO;
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#ifdef PT_WCOOKIE
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/* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're
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running on an OpenBSD release that uses StackGhost (3.1 or
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later). Since release 3.6, OpenBSD uses a fully randomized
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cookie. */
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{
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int pid = inferior_ptid.pid ();
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/* Sanity check. The proper type for a cookie is register_t, but
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we can't assume that this type exists on all systems supported
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by the code in this file. */
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gdb_assert (sizeof (wcookie) == sizeof (register_t));
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/* Fetch the cookie. */
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if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1)
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{
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if (errno != EINVAL)
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perror_with_name (_("Couldn't get StackGhost cookie"));
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/* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later,
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the request wasn't implemented until after OpenBSD 3.4. If
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the kernel doesn't support the PT_WCOOKIE request, assume
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we're running on a kernel that uses non-randomized cookies. */
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wcookie = 0x3;
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}
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}
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#endif /* PT_WCOOKIE */
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if (len > sizeof (unsigned long) - offset)
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len = sizeof (unsigned long) - offset;
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memcpy (readbuf, buf + offset, len);
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*xfered_len = (ULONGEST) len;
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return TARGET_XFER_OK;
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}
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void
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_initialize_sparc_nat (void)
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{
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/* Default to using SunOS 4 register sets. */
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if (sparc_gregmap == NULL)
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sparc_gregmap = &sparc32_sunos4_gregmap;
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if (sparc_fpregmap == NULL)
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sparc_fpregmap = &sparc32_sunos4_fpregmap;
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if (sparc_supply_gregset == NULL)
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sparc_supply_gregset = sparc32_supply_gregset;
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if (sparc_collect_gregset == NULL)
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sparc_collect_gregset = sparc32_collect_gregset;
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if (sparc_supply_fpregset == NULL)
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sparc_supply_fpregset = sparc32_supply_fpregset;
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if (sparc_collect_fpregset == NULL)
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sparc_collect_fpregset = sparc32_collect_fpregset;
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if (sparc_gregset_supplies_p == NULL)
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sparc_gregset_supplies_p = sparc32_gregset_supplies_p;
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if (sparc_fpregset_supplies_p == NULL)
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sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p;
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}
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