-/* Functions specific to running gdb native on a SPARC running SunOS4.
- Copyright 1989, 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
+/* Native-dependent code for SPARC.
+
+ Copyright (C) 2003-2020 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
+#include "regcache.h"
#include "target.h"
-#include "gdbcore.h"
#include <signal.h>
#include <sys/ptrace.h>
-#include <sys/wait.h>
-#ifdef __linux__
-#include <asm/reg.h>
-#else
+#include "gdbsupport/gdb_wait.h"
+#ifdef HAVE_MACHINE_REG_H
#include <machine/reg.h>
#endif
-#include <sys/user.h>
-/* We don't store all registers immediately when requested, since they
- get sent over in large chunks anyway. Instead, we accumulate most
- of the changes and send them over once. "deferred_stores" keeps
- track of which sets of registers we have locally-changed copies of,
- so we only need send the groups that have changed. */
+#include "sparc-tdep.h"
+#include "sparc-nat.h"
+#include "inf-ptrace.h"
+
+/* With some trickery we can use the code in this file for most (if
+ not all) ptrace(2) based SPARC systems, which includes SunOS 4,
+ GNU/Linux and the various SPARC BSD's.
+
+ First, we need a data structure for use with ptrace(2). SunOS has
+ `struct regs' and `struct fp_status' in <machine/reg.h>. BSD's
+ have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux
+ has the same structures as SunOS 4, but they're in <asm/reg.h>,
+ which is a kernel header. As a general rule we avoid including
+ GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t'
+ and a `fpregset_t' that are equivalent to `struct regs' and `struct
+ fp_status' in <sys/ucontext.h>, which is automatically included by
+ <signal.h>. Settling on using the `gregset_t' and `fpregset_t'
+ typedefs, providing them for the other systems, therefore solves
+ the puzzle. */
+
+#ifdef HAVE_MACHINE_REG_H
+#ifdef HAVE_STRUCT_REG
+typedef struct reg gregset_t;
+typedef struct fpreg fpregset_t;
+#else
+typedef struct regs gregset_t;
+typedef struct fp_status fpregset_t;
+#endif
+#endif
-#define INT_REGS 1
-#define STACK_REGS 2
-#define FP_REGS 4
+/* Second, we need to remap the BSD ptrace(2) requests to their SunOS
+ equivalents. GNU/Linux already follows SunOS here. */
-static void
-fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));
+#ifndef PTRACE_GETREGS
+#define PTRACE_GETREGS PT_GETREGS
+#endif
-/* Fetch one or more registers from the inferior. REGNO == -1 to get
- them all. We actually fetch more than requested, when convenient,
- marking them as valid so we won't fetch them again. */
+#ifndef PTRACE_SETREGS
+#define PTRACE_SETREGS PT_SETREGS
+#endif
-void
-fetch_inferior_registers (regno)
- int regno;
+#ifndef PTRACE_GETFPREGS
+#define PTRACE_GETFPREGS PT_GETFPREGS
+#endif
+
+#ifndef PTRACE_SETFPREGS
+#define PTRACE_SETFPREGS PT_SETFPREGS
+#endif
+
+static PTRACE_TYPE_RET
+gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr)
{
- struct regs inferior_registers;
- struct fp_status inferior_fp_registers;
- int i;
-
- /* We should never be called with deferred stores, because a prerequisite
- for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh. */
- if (deferred_stores)
- abort ();
-
- DO_DEFERRED_STORES;
-
- /* Global and Out regs are fetched directly, as well as the control
- registers. If we're getting one of the in or local regs,
- and the stack pointer has not yet been fetched,
- we have to do that first, since they're found in memory relative
- to the stack pointer. */
- if (regno < O7_REGNUM /* including -1 */
- || regno >= Y_REGNUM
- || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
- {
- if (0 != ptrace (PTRACE_GETREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) & inferior_registers, 0))
- perror ("ptrace_getregs");
-
- registers[REGISTER_BYTE (0)] = 0;
- memcpy (®isters[REGISTER_BYTE (1)], &inferior_registers.r_g1,
- 15 * REGISTER_RAW_SIZE (G0_REGNUM));
- *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
- *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
- *(int *) ®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
- *(int *) ®isters[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
-
- for (i = G0_REGNUM; i <= O7_REGNUM; i++)
- register_valid[i] = 1;
- register_valid[Y_REGNUM] = 1;
- register_valid[PS_REGNUM] = 1;
- register_valid[PC_REGNUM] = 1;
- register_valid[NPC_REGNUM] = 1;
- /* If we don't set these valid, read_register_bytes() rereads
- all the regs every time it is called! FIXME. */
- register_valid[WIM_REGNUM] = 1; /* Not true yet, FIXME */
- register_valid[TBR_REGNUM] = 1; /* Not true yet, FIXME */
- register_valid[CPS_REGNUM] = 1; /* Not true yet, FIXME */
- }
+#ifdef __NetBSD__
+ /* Support for NetBSD threads: unlike other ptrace implementations in this
+ file, NetBSD requires that we pass both the pid and lwp. */
+ return ptrace (request, ptid.pid (), addr, ptid.lwp ());
+#else
+ pid_t pid = get_ptrace_pid (ptid);
+ return ptrace (request, pid, addr, 0);
+#endif
+}
- /* Floating point registers */
- if (regno == -1 ||
- regno == FPS_REGNUM ||
- (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
- {
- if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) & inferior_fp_registers,
- 0))
- perror ("ptrace_getfpregs");
- memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
- sizeof inferior_fp_registers.fpu_fr);
- memcpy (®isters[REGISTER_BYTE (FPS_REGNUM)],
- &inferior_fp_registers.Fpu_fsr,
- sizeof (FPU_FSR_TYPE));
- for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++)
- register_valid[i] = 1;
- register_valid[FPS_REGNUM] = 1;
- }
+/* Register set description. */
+const struct sparc_gregmap *sparc_gregmap;
+const struct sparc_fpregmap *sparc_fpregmap;
+void (*sparc_supply_gregset) (const struct sparc_gregmap *,
+ struct regcache *, int , const void *);
+void (*sparc_collect_gregset) (const struct sparc_gregmap *,
+ const struct regcache *, int, void *);
+void (*sparc_supply_fpregset) (const struct sparc_fpregmap *,
+ struct regcache *, int , const void *);
+void (*sparc_collect_fpregset) (const struct sparc_fpregmap *,
+ const struct regcache *, int , void *);
+int (*sparc_gregset_supplies_p) (struct gdbarch *, int);
+int (*sparc_fpregset_supplies_p) (struct gdbarch *, int);
+
+/* Determine whether `gregset_t' contains register REGNUM. */
- /* These regs are saved on the stack by the kernel. Only read them
- all (16 ptrace calls!) if we really need them. */
- if (regno == -1)
- {
- target_read_memory (*(CORE_ADDR *) & registers[REGISTER_BYTE (SP_REGNUM)],
- ®isters[REGISTER_BYTE (L0_REGNUM)],
- 16 * REGISTER_RAW_SIZE (L0_REGNUM));
- for (i = L0_REGNUM; i <= I7_REGNUM; i++)
- register_valid[i] = 1;
- }
- else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
- {
- CORE_ADDR sp = *(CORE_ADDR *) & registers[REGISTER_BYTE (SP_REGNUM)];
- i = REGISTER_BYTE (regno);
- if (register_valid[regno])
- printf_unfiltered ("register %d valid and read\n", regno);
- target_read_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
- ®isters[i], REGISTER_RAW_SIZE (regno));
- register_valid[regno] = 1;
- }
+int
+sparc32_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
+{
+ /* Integer registers. */
+ if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
+ || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
+ || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
+ || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
+ return 1;
+
+ /* Control registers. */
+ if (regnum == SPARC32_PC_REGNUM
+ || regnum == SPARC32_NPC_REGNUM
+ || regnum == SPARC32_PSR_REGNUM
+ || regnum == SPARC32_Y_REGNUM)
+ return 1;
+
+ return 0;
+}
+
+/* Determine whether `fpregset_t' contains register REGNUM. */
+
+int
+sparc32_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
+{
+ /* Floating-point registers. */
+ if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
+ return 1;
+
+ /* Control registers. */
+ if (regnum == SPARC32_FSR_REGNUM)
+ return 1;
+
+ return 0;
}
-/* Store our register values back into the inferior.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
+/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
+ for all registers (including the floating-point registers). */
void
-store_inferior_registers (regno)
- int regno;
+sparc_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
- struct regs inferior_registers;
- struct fp_status inferior_fp_registers;
- int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
-
- /* First decide which pieces of machine-state we need to modify.
- Default for regno == -1 case is all pieces. */
- if (regno >= 0)
- if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
- {
- wanna_store = FP_REGS;
- }
- else
- {
- if (regno == SP_REGNUM)
- wanna_store = INT_REGS + STACK_REGS;
- else if (regno < L0_REGNUM || regno > I7_REGNUM)
- wanna_store = INT_REGS;
- else if (regno == FPS_REGNUM)
- wanna_store = FP_REGS;
- else
- wanna_store = STACK_REGS;
- }
+ struct gdbarch *gdbarch = regcache->arch ();
+ ptid_t ptid = regcache->ptid ();
- /* See if we're forcing the stores to happen now, or deferring. */
- if (regno == -2)
- {
- wanna_store = deferred_stores;
- deferred_stores = 0;
- }
- else
+ if (regnum == SPARC_G0_REGNUM)
{
- if (wanna_store == STACK_REGS)
- {
- /* Fall through and just store one stack reg. If we deferred
- it, we'd have to store them all, or remember more info. */
- }
- else
- {
- deferred_stores |= wanna_store;
- return;
- }
+ gdb_byte zero[8] = { 0 };
+
+ regcache->raw_supply (SPARC_G0_REGNUM, &zero);
+ return;
}
- if (wanna_store & STACK_REGS)
+ if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
{
- CORE_ADDR sp = *(CORE_ADDR *) & registers[REGISTER_BYTE (SP_REGNUM)];
+ gregset_t regs;
- if (regno < 0 || regno == SP_REGNUM)
- {
- if (!register_valid[L0_REGNUM + 5])
- abort ();
- target_write_memory (sp,
- ®isters[REGISTER_BYTE (L0_REGNUM)],
- 16 * REGISTER_RAW_SIZE (L0_REGNUM));
- }
- else
- {
- if (!register_valid[regno])
- abort ();
- target_write_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
- ®isters[REGISTER_BYTE (regno)],
- REGISTER_RAW_SIZE (regno));
- }
+ if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1)
+ perror_with_name (_("Couldn't get registers"));
+ sparc_supply_gregset (sparc_gregmap, regcache, -1, ®s);
+ if (regnum != -1)
+ return;
}
- if (wanna_store & INT_REGS)
+ if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum))
{
- if (!register_valid[G1_REGNUM])
- abort ();
-
- memcpy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (G1_REGNUM)],
- 15 * REGISTER_RAW_SIZE (G1_REGNUM));
-
- inferior_registers.r_ps =
- *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)];
- inferior_registers.r_pc =
- *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
- inferior_registers.r_npc =
- *(int *) ®isters[REGISTER_BYTE (NPC_REGNUM)];
- inferior_registers.r_y =
- *(int *) ®isters[REGISTER_BYTE (Y_REGNUM)];
-
- if (0 != ptrace (PTRACE_SETREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) & inferior_registers, 0))
- perror ("ptrace_setregs");
- }
+ fpregset_t fpregs;
- if (wanna_store & FP_REGS)
- {
- if (!register_valid[FP0_REGNUM + 9])
- abort ();
- memcpy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)],
- sizeof inferior_fp_registers.fpu_fr);
- memcpy (&inferior_fp_registers.Fpu_fsr,
- ®isters[REGISTER_BYTE (FPS_REGNUM)], sizeof (FPU_FSR_TYPE));
- if (0 !=
- ptrace (PTRACE_SETFPREGS, inferior_pid,
- (PTRACE_ARG3_TYPE) & inferior_fp_registers, 0))
- perror ("ptrace_setfpregs");
+ if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs);
}
}
-
-static void
-fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
- char *core_reg_sect;
- unsigned core_reg_size;
- int which;
- CORE_ADDR ignore; /* reg addr, unused in this version */
+void
+sparc_store_inferior_registers (struct regcache *regcache, int regnum)
{
+ struct gdbarch *gdbarch = regcache->arch ();
+ ptid_t ptid = regcache->ptid ();
- if (which == 0)
+ if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
{
+ gregset_t regs;
- /* Integer registers */
-
-#define gregs ((struct regs *)core_reg_sect)
- /* G0 *always* holds 0. */
- *(int *) ®isters[REGISTER_BYTE (0)] = 0;
-
- /* The globals and output registers. */
- memcpy (®isters[REGISTER_BYTE (G1_REGNUM)], &gregs->r_g1,
- 15 * REGISTER_RAW_SIZE (G1_REGNUM));
- *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
- *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
- *(int *) ®isters[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
- *(int *) ®isters[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
-
- /* My best guess at where to get the locals and input
- registers is exactly where they usually are, right above
- the stack pointer. If the core dump was caused by a bus error
- from blowing away the stack pointer (as is possible) then this
- won't work, but it's worth the try. */
- {
- int sp;
-
- sp = *(int *) ®isters[REGISTER_BYTE (SP_REGNUM)];
- if (0 != target_read_memory (sp, ®isters[REGISTER_BYTE (L0_REGNUM)],
- 16 * REGISTER_RAW_SIZE (L0_REGNUM)))
- {
- /* fprintf_unfiltered so user can still use gdb */
- fprintf_unfiltered (gdb_stderr,
- "Couldn't read input and local registers from core file\n");
- }
- }
+ if (gdb_ptrace (PTRACE_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ sparc_collect_gregset (sparc_gregmap, regcache, regnum, ®s);
+
+ if (gdb_ptrace (PTRACE_SETREGS, ptid, (PTRACE_TYPE_ARG3) ®s) == -1)
+ perror_with_name (_("Couldn't write registers"));
+
+ /* Deal with the stack regs. */
+ if (regnum == -1 || regnum == SPARC_SP_REGNUM
+ || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM))
+ {
+ ULONGEST sp;
+
+ regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
+ sparc_collect_rwindow (regcache, sp, regnum);
+ }
+
+ if (regnum != -1)
+ return;
}
- else if (which == 2)
+
+ if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum))
{
+ fpregset_t fpregs, saved_fpregs;
- /* Floating point registers */
+ if (gdb_ptrace (PTRACE_GETFPREGS, ptid, (PTRACE_TYPE_ARG3) &fpregs) == -1)
+ perror_with_name (_("Couldn't get floating-point registers"));
-#define fpuregs ((struct fpu *) core_reg_sect)
- if (core_reg_size >= sizeof (struct fpu))
+ memcpy (&saved_fpregs, &fpregs, sizeof (fpregs));
+ sparc_collect_fpregset (sparc_fpregmap, regcache, regnum, &fpregs);
+
+ /* Writing the floating-point registers will fail on NetBSD with
+ EINVAL if the inferior process doesn't have an FPU state
+ (i.e. if it didn't use the FPU yet). Therefore we don't try
+ to write the registers if nothing changed. */
+ if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0)
{
- memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], fpuregs->fpu_regs,
- sizeof (fpuregs->fpu_regs));
- memcpy (®isters[REGISTER_BYTE (FPS_REGNUM)], &fpuregs->fpu_fsr,
- sizeof (FPU_FSR_TYPE));
+ if (gdb_ptrace (PTRACE_SETFPREGS, ptid,
+ (PTRACE_TYPE_ARG3) &fpregs) == -1)
+ perror_with_name (_("Couldn't write floating-point registers"));
}
- else
- fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
+
+ if (regnum != -1)
+ return;
}
}
-int
-kernel_u_size ()
-{
- return (sizeof (struct user));
-}
\f
+/* Implement the to_xfer_partial target_ops method for
+ TARGET_OBJECT_WCOOKIE. Fetch StackGhost Per-Process XOR cookie. */
+
+enum target_xfer_status
+sparc_xfer_wcookie (enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len)
+{
+ unsigned long wcookie = 0;
+ char *buf = (char *)&wcookie;
+
+ gdb_assert (object == TARGET_OBJECT_WCOOKIE);
+ gdb_assert (readbuf && writebuf == NULL);
+
+ if (offset == sizeof (unsigned long))
+ return TARGET_XFER_EOF; /* Signal EOF. */
+ if (offset > sizeof (unsigned long))
+ return TARGET_XFER_E_IO;
+
+#ifdef PT_WCOOKIE
+ /* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're
+ running on an OpenBSD release that uses StackGhost (3.1 or
+ later). Since release 3.6, OpenBSD uses a fully randomized
+ cookie. */
+ {
+ int pid = inferior_ptid.pid ();
+
+ /* Sanity check. The proper type for a cookie is register_t, but
+ we can't assume that this type exists on all systems supported
+ by the code in this file. */
+ gdb_assert (sizeof (wcookie) == sizeof (register_t));
+
+ /* Fetch the cookie. */
+ if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1)
+ {
+ if (errno != EINVAL)
+ perror_with_name (_("Couldn't get StackGhost cookie"));
+
+ /* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later,
+ the request wasn't implemented until after OpenBSD 3.4. If
+ the kernel doesn't support the PT_WCOOKIE request, assume
+ we're running on a kernel that uses non-randomized cookies. */
+ wcookie = 0x3;
+ }
+ }
+#endif /* PT_WCOOKIE */
-/* Register that we are able to handle sparc core file formats.
- FIXME: is this really bfd_target_unknown_flavour? */
+ if (len > sizeof (unsigned long) - offset)
+ len = sizeof (unsigned long) - offset;
-static struct core_fns sparc_core_fns =
-{
- bfd_target_unknown_flavour,
- fetch_core_registers,
- NULL
-};
+ memcpy (readbuf, buf + offset, len);
+ *xfered_len = (ULONGEST) len;
+ return TARGET_XFER_OK;
+}
+\f
+void _initialize_sparc_nat ();
void
-_initialize_core_sparc ()
+_initialize_sparc_nat ()
{
- add_core_fns (&sparc_core_fns);
+ /* Default to using SunOS 4 register sets. */
+ if (sparc_gregmap == NULL)
+ sparc_gregmap = &sparc32_sunos4_gregmap;
+ if (sparc_fpregmap == NULL)
+ sparc_fpregmap = &sparc32_sunos4_fpregmap;
+ if (sparc_supply_gregset == NULL)
+ sparc_supply_gregset = sparc32_supply_gregset;
+ if (sparc_collect_gregset == NULL)
+ sparc_collect_gregset = sparc32_collect_gregset;
+ if (sparc_supply_fpregset == NULL)
+ sparc_supply_fpregset = sparc32_supply_fpregset;
+ if (sparc_collect_fpregset == NULL)
+ sparc_collect_fpregset = sparc32_collect_fpregset;
+ if (sparc_gregset_supplies_p == NULL)
+ sparc_gregset_supplies_p = sparc32_gregset_supplies_p;
+ if (sparc_fpregset_supplies_p == NULL)
+ sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p;
}
projects / deliverable / binutils-gdb.git / blobdiff