-/* Motorola m68k native support for Linux
- Copyright (C) 1996,1998 Free Software Foundation, Inc.
+/* Motorola m68k native support for GNU/Linux.
+
+ Copyright 1996, 1998, 2000, 2001, 2002 Free Software Foundation,
+ Inc.
This file is part of GDB.
#include "inferior.h"
#include "language.h"
#include "gdbcore.h"
+#include "gdb_string.h"
+#include "regcache.h"
-#ifdef USG
-#include <sys/types.h>
-#endif
+#include "m68k-tdep.h"
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
+#include <sys/ptrace.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/procfs.h>
+#ifdef HAVE_SYS_REG_H
+#include <sys/reg.h>
+#endif
+
#include <sys/file.h>
#include "gdb_stat.h"
#include "target.h"
\f
-
-/* This table must line up with REGISTER_NAMES in tm-m68k.h */
+/* This table must line up with REGISTER_NAME in "m68k-tdep.c". */
static const int regmap[] =
{
PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
45, 46, 47
};
+/* Which ptrace request retrieves which registers?
+ These apply to the corresponding SET requests as well. */
+#define NUM_GREGS (18)
+#define MAX_NUM_REGS (NUM_GREGS + 11)
+
+int
+getregs_supplies (int regno)
+{
+ return 0 <= regno && regno < NUM_GREGS;
+}
+
+int
+getfpregs_supplies (int regno)
+{
+ return FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM;
+}
+
+/* Does the current host support the GETREGS request? */
+int have_ptrace_getregs =
+#ifdef HAVE_PTRACE_GETREGS
+ 1
+#else
+ 0
+#endif
+;
+
+\f
+
/* BLOCKEND is the value of u.u_ar0, and points to the place where GS
is stored. */
int
-m68k_linux_register_u_addr (blockend, regnum)
- int blockend;
- int regnum;
+m68k_linux_register_u_addr (int blockend, int regnum)
{
return (blockend + 4 * regmap[regnum]);
}
+\f
+
+/* Fetching registers directly from the U area, one at a time. */
+
+/* FIXME: This duplicates code from `inptrace.c'. The problem is that we
+ define FETCH_INFERIOR_REGISTERS since we want to use our own versions
+ of {fetch,store}_inferior_registers that use the GETREGS request. This
+ means that the code in `infptrace.c' is #ifdef'd out. But we need to
+ fall back on that code when GDB is running on top of a kernel that
+ doesn't support the GETREGS request. */
+
+#ifndef PT_READ_U
+#define PT_READ_U PTRACE_PEEKUSR
+#endif
+#ifndef PT_WRITE_U
+#define PT_WRITE_U PTRACE_POKEUSR
+#endif
+
+/* Default the type of the ptrace transfer to int. */
+#ifndef PTRACE_XFER_TYPE
+#define PTRACE_XFER_TYPE int
+#endif
+
+/* Fetch one register. */
+
+static void
+fetch_register (int regno)
+{
+ /* This isn't really an address. But ptrace thinks of it as one. */
+ CORE_ADDR regaddr;
+ char mess[128]; /* For messages */
+ int i;
+ unsigned int offset; /* Offset of registers within the u area. */
+ char buf[MAX_REGISTER_SIZE];
+ int tid;
+
+ if (CANNOT_FETCH_REGISTER (regno))
+ {
+ memset (buf, '\0', register_size (current_gdbarch, regno)); /* Supply zeroes */
+ regcache_raw_supply (current_regcache, regno, buf);
+ return;
+ }
+
+ /* Overload thread id onto process id */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
+
+ offset = U_REGS_OFFSET;
+
+ regaddr = register_addr (regno, offset);
+ for (i = 0; i < register_size (current_gdbarch, regno);
+ i += sizeof (PTRACE_XFER_TYPE))
+ {
+ errno = 0;
+ *(PTRACE_XFER_TYPE *) &buf[i] = ptrace (PT_READ_U, tid,
+ (PTRACE_ARG3_TYPE) regaddr, 0);
+ regaddr += sizeof (PTRACE_XFER_TYPE);
+ if (errno != 0)
+ {
+ sprintf (mess, "reading register %s (#%d)",
+ REGISTER_NAME (regno), regno);
+ perror_with_name (mess);
+ }
+ }
+ regcache_raw_supply (current_regcache, regno, buf);
+}
+
+/* Fetch register values from the inferior.
+ If REGNO is negative, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
+
+void
+old_fetch_inferior_registers (int regno)
+{
+ if (regno >= 0)
+ {
+ fetch_register (regno);
+ }
+ else
+ {
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ fetch_register (regno);
+ }
+ }
+}
+
+/* Store one register. */
+
+static void
+store_register (int regno)
+{
+ /* This isn't really an address. But ptrace thinks of it as one. */
+ CORE_ADDR regaddr;
+ char mess[128]; /* For messages */
+ int i;
+ unsigned int offset; /* Offset of registers within the u area. */
+ int tid;
+ char buf[MAX_REGISTER_SIZE];
-/* Given a pointer to a general register set in /proc format (gregset_t *),
- unpack the register contents and supply them as gdb's idea of the current
- register values. */
+ if (CANNOT_STORE_REGISTER (regno))
+ {
+ return;
+ }
+
+ /* Overload thread id onto process id */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
+
+ offset = U_REGS_OFFSET;
+
+ regaddr = register_addr (regno, offset);
+
+ /* Put the contents of regno into a local buffer */
+ regcache_raw_collect (current_regcache, regno, buf);
+
+ /* Store the local buffer into the inferior a chunk at the time. */
+ for (i = 0; i < register_size (current_gdbarch, regno);
+ i += sizeof (PTRACE_XFER_TYPE))
+ {
+ errno = 0;
+ ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
+ *(PTRACE_XFER_TYPE *) (buf + i));
+ regaddr += sizeof (PTRACE_XFER_TYPE);
+ if (errno != 0)
+ {
+ sprintf (mess, "writing register %s (#%d)",
+ REGISTER_NAME (regno), regno);
+ perror_with_name (mess);
+ }
+ }
+}
+
+/* Store our register values back into the inferior.
+ If REGNO is negative, do this for all registers.
+ Otherwise, REGNO specifies which register (so we can save time). */
+
+void
+old_store_inferior_registers (int regno)
+{
+ if (regno >= 0)
+ {
+ store_register (regno);
+ }
+ else
+ {
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ store_register (regno);
+ }
+ }
+}
+\f
+/* Given a pointer to a general register set in /proc format
+ (elf_gregset_t *), unpack the register contents and supply
+ them as gdb's idea of the current register values. */
/* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
#include "gregset.h"
void
-supply_gregset (gregsetp)
- gregset_t *gregsetp;
+supply_gregset (elf_gregset_t *gregsetp)
{
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
int regi;
- for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++)
- supply_register (regi, (char *) (*gregsetp + regmap[regi]));
- supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));
- supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));
+ for (regi = M68K_D0_REGNUM; regi <= SP_REGNUM; regi++)
+ regcache_raw_supply (current_regcache, regi, (char *) ®p[regmap[regi]]);
+ regcache_raw_supply (current_regcache, PS_REGNUM, (char *) ®p[PT_SR]);
+ regcache_raw_supply (current_regcache, PC_REGNUM, (char *) ®p[PT_PC]);
+}
+
+/* Fill register REGNO (if it is a general-purpose register) in
+ *GREGSETPS with the value in GDB's register array. If REGNO is -1,
+ do this for all registers. */
+void
+fill_gregset (elf_gregset_t *gregsetp, int regno)
+{
+ elf_greg_t *regp = (elf_greg_t *) gregsetp;
+ int i;
+
+ for (i = 0; i < NUM_GREGS; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (current_regcache, i, regp + regmap[i]);
+}
+
+#ifdef HAVE_PTRACE_GETREGS
+
+/* Fetch all general-purpose registers from process/thread TID and
+ store their values in GDB's register array. */
+
+static void
+fetch_regs (int tid)
+{
+ elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
+ {
+ if (errno == EIO)
+ {
+ /* The kernel we're running on doesn't support the GETREGS
+ request. Reset `have_ptrace_getregs'. */
+ have_ptrace_getregs = 0;
+ return;
+ }
+
+ perror_with_name (_("Couldn't get registers"));
+ }
+
+ supply_gregset (®s);
+}
+
+/* Store all valid general-purpose registers in GDB's register array
+ into the process/thread specified by TID. */
+
+static void
+store_regs (int tid, int regno)
+{
+ elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name (_("Couldn't get registers"));
+
+ fill_gregset (®s, regno);
+
+ if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
+ perror_with_name (_("Couldn't write registers"));
}
-/* Given a pointer to a floating point register set in /proc format
- (fpregset_t *), unpack the register contents and supply them as gdb's
- idea of the current floating point register values. */
+#else
+
+static void fetch_regs (int tid) {}
+static void store_regs (int tid, int regno) {}
+
+#endif
+
+\f
+/* Transfering floating-point registers between GDB, inferiors and cores. */
+
+/* What is the address of fpN within the floating-point register set F? */
+#define FPREG_ADDR(f, n) ((char *) &(f)->fpregs[(n) * 3])
+
+/* Fill GDB's register array with the floating-point register values in
+ *FPREGSETP. */
void
-supply_fpregset (fpregsetp)
- fpregset_t *fpregsetp;
+supply_fpregset (elf_fpregset_t *fpregsetp)
{
int regi;
- for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
- supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);
- supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);
- supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);
- supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);
+ for (regi = FP0_REGNUM; regi < FP0_REGNUM + 8; regi++)
+ regcache_raw_supply (current_regcache, regi,
+ FPREG_ADDR (fpregsetp, regi - FP0_REGNUM));
+ regcache_raw_supply (current_regcache, M68K_FPC_REGNUM,
+ (char *) &fpregsetp->fpcntl[0]);
+ regcache_raw_supply (current_regcache, M68K_FPS_REGNUM,
+ (char *) &fpregsetp->fpcntl[1]);
+ regcache_raw_supply (current_regcache, M68K_FPI_REGNUM,
+ (char *) &fpregsetp->fpcntl[2]);
}
+/* Fill register REGNO (if it is a floating-point register) in
+ *FPREGSETP with the value in GDB's register array. If REGNO is -1,
+ do this for all registers. */
+
+void
+fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
+{
+ int i;
+
+ /* Fill in the floating-point registers. */
+ for (i = FP0_REGNUM; i < FP0_REGNUM + 8; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (current_regcache, i,
+ FPREG_ADDR (fpregsetp, i - FP0_REGNUM));
+
+ /* Fill in the floating-point control registers. */
+ for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
+ if (regno == -1 || regno == i)
+ regcache_raw_collect (current_regcache, i,
+ (char *) &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
+}
+
+#ifdef HAVE_PTRACE_GETREGS
+
+/* Fetch all floating-point registers from process/thread TID and store
+ thier values in GDB's register array. */
+
+static void
+fetch_fpregs (int tid)
+{
+ elf_fpregset_t fpregs;
+
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ supply_fpregset (&fpregs);
+}
+
+/* Store all valid floating-point registers in GDB's register array
+ into the process/thread specified by TID. */
+
+static void
+store_fpregs (int tid, int regno)
+{
+ elf_fpregset_t fpregs;
+
+ if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ fill_fpregset (&fpregs, regno);
+
+ if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
+ perror_with_name (_("Couldn't write floating point status"));
+}
+
+#else
+
+static void fetch_fpregs (int tid) {}
+static void store_fpregs (int tid, int regno) {}
+
#endif
+
+#endif
+\f
+/* Transferring arbitrary registers between GDB and inferior. */
+
+/* Fetch register REGNO from the child process. If REGNO is -1, do
+ this for all registers (including the floating point and SSE
+ registers). */
+
+void
+fetch_inferior_registers (int regno)
+{
+ int tid;
+
+ /* Use the old method of peeking around in `struct user' if the
+ GETREGS request isn't available. */
+ if (! have_ptrace_getregs)
+ {
+ old_fetch_inferior_registers (regno);
+ return;
+ }
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+
+ /* Use the PTRACE_GETFPXREGS request whenever possible, since it
+ transfers more registers in one system call, and we'll cache the
+ results. But remember that fetch_fpxregs can fail, and return
+ zero. */
+ if (regno == -1)
+ {
+ fetch_regs (tid);
+
+ /* The call above might reset `have_ptrace_getregs'. */
+ if (! have_ptrace_getregs)
+ {
+ old_fetch_inferior_registers (-1);
+ return;
+ }
+
+ fetch_fpregs (tid);
+ return;
+ }
+
+ if (getregs_supplies (regno))
+ {
+ fetch_regs (tid);
+ return;
+ }
+
+ if (getfpregs_supplies (regno))
+ {
+ fetch_fpregs (tid);
+ return;
+ }
+
+ internal_error (__FILE__, __LINE__,
+ _("Got request for bad register number %d."), regno);
+}
+
+/* Store register REGNO back into the child process. If REGNO is -1,
+ do this for all registers (including the floating point and SSE
+ registers). */
+void
+store_inferior_registers (int regno)
+{
+ int tid;
+
+ /* Use the old method of poking around in `struct user' if the
+ SETREGS request isn't available. */
+ if (! have_ptrace_getregs)
+ {
+ old_store_inferior_registers (regno);
+ return;
+ }
+
+ /* GNU/Linux LWP ID's are process ID's. */
+ tid = TIDGET (inferior_ptid);
+ if (tid == 0)
+ tid = PIDGET (inferior_ptid); /* Not a threaded program. */
+
+ /* Use the PTRACE_SETFPREGS requests whenever possible, since it
+ transfers more registers in one system call. But remember that
+ store_fpregs can fail, and return zero. */
+ if (regno == -1)
+ {
+ store_regs (tid, regno);
+ store_fpregs (tid, regno);
+ return;
+ }
+
+ if (getregs_supplies (regno))
+ {
+ store_regs (tid, regno);
+ return;
+ }
+
+ if (getfpregs_supplies (regno))
+ {
+ store_fpregs (tid, regno);
+ return;
+ }
+
+ internal_error (__FILE__, __LINE__,
+ _("Got request to store bad register number %d."), regno);
+}
+\f
+/* Interpreting register set info found in core files. */
+
+/* Provide registers to GDB from a core file.
+
+ (We can't use the generic version of this function in
+ core-regset.c, because we need to use elf_gregset_t instead of
+ gregset_t.)
+
+ CORE_REG_SECT points to an array of bytes, which are the contents
+ of a `note' from a core file which BFD thinks might contain
+ register contents. CORE_REG_SIZE is its size.
+
+ WHICH says which register set corelow suspects this is:
+ 0 --- the general-purpose register set, in elf_gregset_t format
+ 2 --- the floating-point register set, in elf_fpregset_t format
+
+ REG_ADDR isn't used on GNU/Linux. */
+
+static void
+fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
+ int which, CORE_ADDR reg_addr)
+{
+ elf_gregset_t gregset;
+ elf_fpregset_t fpregset;
+
+ switch (which)
+ {
+ case 0:
+ if (core_reg_size != sizeof (gregset))
+ warning (_("Wrong size gregset in core file."));
+ else
+ {
+ memcpy (&gregset, core_reg_sect, sizeof (gregset));
+ supply_gregset (&gregset);
+ }
+ break;
+
+ case 2:
+ if (core_reg_size != sizeof (fpregset))
+ warning (_("Wrong size fpregset in core file."));
+ else
+ {
+ memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
+ supply_fpregset (&fpregset);
+ }
+ break;
+
+ default:
+ /* We've covered all the kinds of registers we know about here,
+ so this must be something we wouldn't know what to do with
+ anyway. Just ignore it. */
+ break;
+ }
+}
\f
int
-kernel_u_size ()
+kernel_u_size (void)
{
return (sizeof (struct user));
}
\f
-/* Return non-zero if PC points into the signal trampoline. */
+/* Register that we are able to handle GNU/Linux ELF core file
+ formats. */
-int
-in_sigtramp (pc)
- CORE_ADDR pc;
-{
- CORE_ADDR sp;
- char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
- int insn;
-
- sp = read_register (SP_REGNUM);
- if (pc - 2 < sp)
- return 0;
-
- if (read_memory_nobpt (pc, buf, sizeof (buf)))
- return 0;
- insn = extract_unsigned_integer (buf, sizeof (buf));
- if (insn == 0xdefc /* addaw #,sp */
- || insn == 0x7077 /* moveq #119,d0 */
- || insn == 0x4e40 /* trap #0 */
- || insn == 0x203c /* movel #,d0 */ )
- return 1;
-
- if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
- return 0;
- insn = extract_unsigned_integer (buf, sizeof (buf));
- if (insn == 0xdefc /* addaw #,sp */
- || insn == 0x7077 /* moveq #119,d0 */
- || insn == 0x4e40 /* trap #0 */
- || insn == 0x203c /* movel #,d0 */ )
- return 1;
-
- return 0;
+static struct core_fns linux_elf_core_fns =
+{
+ bfd_target_elf_flavour, /* core_flavour */
+ default_check_format, /* check_format */
+ default_core_sniffer, /* core_sniffer */
+ fetch_core_registers, /* core_read_registers */
+ NULL /* next */
+};
+
+void
+_initialize_m68k_linux_nat (void)
+{
+ deprecated_add_core_fns (&linux_elf_core_fns);
}
projects / binutils.git / blobdiff