[rfa] MIPS/Linux, take 3

[rfa] MIPS/Linux, take 3

[Daniel Jacobowitz]

Nothing surprising here; just the last style fixes and NEWS entry that
were asked for.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

2001-07-06  Daniel Jacobowitz  <drow@mvista.com>

	* mips-linux-tdep.c: New file.
	* mips-linux-nat.c: New file.
	* config/mips/linux.mh: New file.
	* config/mips/linux.mt: New file.
	* config/mips/xm-linux.h: New file.
	* config/mips/nm-linux.h: New file.
	* config/mips/tm-linux.h: New file.
	* configure.host: Recognize mips*-*-linux.
	* configure.tgt: Likewise.
	* NEWS: Mention mips*-*-linux port.

Index: gdb/mips-linux-tdep.c
===================================================================
RCS file: N/A
diff -u /dev/null gdb/mips-linux-tdep.c
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/mips-linux-tdep.c	Wed Jul  4 16:33:13 2001
@@ -0,0 +1,313 @@
+/* Target-dependent code for Linux/MIPS.
+   Copyright 1996, 2001 Free Software Foundation, Inc.
+
+   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
+   Rutgers University CAIP Research Center.
+
+   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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "target.h"
+#include "solib-svr4.h"
+
+/* Copied from <asm/elf.h>.  */
+#define ELF_NGREG       45
+#define ELF_NFPREG      33
+
+typedef unsigned char elf_greg_t[4];
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef unsigned char elf_fpreg_t[8];
+typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
+
+/* 0 - 31 are integer registers, 32 - 63 are fp registers.  */
+#define FPR_BASE        32
+#define PC              64
+#define CAUSE           65
+#define BADVADDR        66
+#define MMHI            67
+#define MMLO            68
+#define FPC_CSR         69
+#define FPC_EIR         70
+
+#define EF_REG0			6
+#define EF_REG31		37
+#define EF_LO			38
+#define EF_HI			39
+#define EF_CP0_EPC		40
+#define EF_CP0_BADVADDR		41
+#define EF_CP0_STATUS		42
+#define EF_CP0_CAUSE		43
+
+#define EF_SIZE			180
+
+/* Figure out where the longjmp will land.
+   We expect the first arg to be a pointer to the jmp_buf structure from
+   which we extract the pc (JB_PC) that we will land at.  The pc is copied
+   into PC.  This routine returns 1 on success.  */
+
+int
+get_longjmp_target (CORE_ADDR *pc)
+{
+  CORE_ADDR jb_addr;
+  char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+
+  jb_addr = read_register (A0_REGNUM);
+
+  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
+			  TARGET_PTR_BIT / TARGET_CHAR_BIT))
+    return 0;
+
+  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+
+  return 1;
+}
+
+/* Unpack an elf_gregset_t into GDB's register cache.  */
+
+void 
+supply_gregset (elf_gregset_t *gregsetp)
+{
+  int regi;
+  elf_greg_t *regp = *gregsetp;
+  static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+
+  for (regi = EF_REG0; regi <= EF_REG31; regi++)
+    supply_register ((regi - EF_REG0), (char *)(regp + regi));
+
+  supply_register (LO_REGNUM, (char *)(regp + EF_LO));
+  supply_register (HI_REGNUM, (char *)(regp + EF_HI));
+
+  supply_register (PC_REGNUM, (char *)(regp + EF_CP0_EPC));
+  supply_register (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR));
+  supply_register (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
+  supply_register (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE));
+
+  /* Fill inaccessible registers with zero.  */
+  supply_register (FP_REGNUM, zerobuf);
+  supply_register (UNUSED_REGNUM, zerobuf);
+  for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
+    supply_register (regi, zerobuf);
+}
+
+/* Pack our registers (or one register) into an elf_gregset_t.  */
+
+void
+fill_gregset (elf_gregset_t *gregsetp, int regno)
+{
+  int regi;
+  elf_greg_t *regp = *gregsetp;
+
+  memset ((char *) regp, 0, sizeof (elf_gregset_t));
+
+#define fill(regp, regi, offset)			\
+	  memcpy((char *)((regp) + (offset)),		\
+		 &registers[REGISTER_BYTE (regi)],	\
+		 sizeof (elf_greg_t))
+
+  for (regi = EF_REG0; regi <= EF_REG31; regi++)
+    fill (regp, regi - EF_REG0, regi);
+
+  fill (regp, LO_REGNUM, EF_LO);
+  fill (regp, HI_REGNUM, EF_HI);
+
+  fill (regp, PC_REGNUM, EF_CP0_EPC);
+  fill (regp, BADVADDR_REGNUM, EF_CP0_BADVADDR);
+  fill (regp, PS_REGNUM, EF_CP0_STATUS);
+  fill (regp, CAUSE_REGNUM, EF_CP0_CAUSE);
+#undef fill
+}
+
+/* Likewise, unpack an elf_fpregset_t.  */
+
+void
+supply_fpregset (elf_fpregset_t *fpregsetp)
+{
+  register int regi;
+  static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+
+  for (regi = 0; regi < 32; regi++)
+    supply_register (FP0_REGNUM + regi,
+		     (char *)(*fpregsetp + regi));
+
+  supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32));
+
+  /* FIXME: how can we supply FCRIR_REGNUM?  The ABI doesn't tell us. */
+  supply_register (FCRIR_REGNUM, zerobuf);
+}
+
+/* Likewise, pack one or all floating point registers into an
+   elf_fpregset_t.  */
+
+void
+fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
+{
+  int regi;
+  char *from, *to;
+
+  for (regi = 0; regi < 32; regi++)
+    {
+      if ((regno == -1) || (regno == FP0_REGNUM + regi))
+	{
+	  from = (char *) &registers[REGISTER_BYTE (regi + FP0_REGNUM)];
+	  to = (char *) (*fpregsetp + regi);
+	  memcpy (to, from, REGISTER_RAW_SIZE (regi));
+	}
+    }
+
+  if ((regno == -1) || (regno == FCRCS_REGNUM))
+    {
+      from = (char *) &registers[REGISTER_BYTE (FCRCS_REGNUM)];
+      to = (char *) (*fpregsetp + 32);
+      memcpy (to, from, REGISTER_RAW_SIZE (FCRCS_REGNUM));
+    }
+}
+
+/* Map gdb internal register number to ptrace ``address''.
+   These ``addresses'' are defined in <asm/ptrace.h>.  */
+
+#define REGISTER_PTRACE_ADDR(regno)		\
+   (regno < 32 ? 		regno  		\
+  : (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) ?		\
+				FPR_BASE + (regno - FP0_REGNUM)	\
+  : regno == PC_REGNUM ?	PC		\
+  : regno == CAUSE_REGNUM ?	CAUSE		\
+  : regno == BADVADDR_REGNUM ?	BADVADDR	\
+  : regno == LO_REGNUM ?	MMLO		\
+  : regno == HI_REGNUM ?	MMHI		\
+  : regno == FCRCS_REGNUM ?	FPC_CSR		\
+  : regno == FCRIR_REGNUM ?	FPC_EIR		\
+  : 0)
+
+/* Return the ptrace ``address'' of register REGNO.  */
+
+CORE_ADDR
+register_addr (int regno, CORE_ADDR blockend)
+{
+  int regaddr;
+
+  if (regno < 0 || regno >= NUM_REGS)
+    error ("Bogon register number %d.", regno);
+
+  regaddr = REGISTER_PTRACE_ADDR (regno);
+
+  if (regno != 0 && regaddr == 0)
+    error ("Unknowable register number %d.", regno);
+
+  return regaddr;
+}
+
+static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
+
+void _initialize_core_regset (void);
+
+/*  Use a local version of this function to get the correct types for
+    regsets, until multi-arch core support is ready.  */
+
+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;
+
+  if (which == 0)
+    {
+      if (core_reg_size != sizeof (gregset))
+	{
+	  warning ("wrong size gregset struct in core file");
+	}
+      else
+	{
+	  memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
+	  supply_gregset (&gregset);
+	}
+    }
+  else if (which == 2)
+    {
+      if (core_reg_size != sizeof (fpregset))
+	{
+	  warning ("wrong size fpregset struct in core file");
+	}
+      else
+	{
+	  memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
+	  supply_fpregset (&fpregset);
+	}
+    }
+}
+
+/* Register that we are able to handle ELF file formats using standard
+   procfs "regset" structures.  */
+
+static struct core_fns regset_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_core_regset ()
+{
+  add_core_fns (&regset_core_fns);
+}
+
+
+/* Fetch (and possibly build) an appropriate link_map_offsets
+   structure for native Linux/MIPS targets using the struct offsets
+   defined in link.h (but without actual reference to that file).
+
+   This makes it possible to access Linux/MIPS shared libraries from a
+   GDB that was not built on an Linux/MIPS host (for cross debugging).  */
+
+struct link_map_offsets *
+mips_linux_svr4_fetch_link_map_offsets (void)
+{ 
+  static struct link_map_offsets lmo;
+  static struct link_map_offsets *lmp = NULL;
+
+  if (lmp == NULL)
+    { 
+      lmp = &lmo;
+
+      lmo.r_debug_size = 8;	/* The actual size is 20 bytes, but
+				   this is all we need.  */
+      lmo.r_map_offset = 4;
+      lmo.r_map_size   = 4;
+
+      lmo.link_map_size = 20;
+
+      lmo.l_addr_offset = 0;
+      lmo.l_addr_size   = 4;
+
+      lmo.l_name_offset = 4;
+      lmo.l_name_size   = 4;
+
+      lmo.l_next_offset = 12;
+      lmo.l_next_size   = 4;
+
+      lmo.l_prev_offset = 16;
+      lmo.l_prev_size   = 4;
+    }
+
+  return lmp;
+}
Index: gdb/mips-linux-nat.c
===================================================================
RCS file: N/A
diff -u /dev/null gdb/mips-linux-nat.c
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/mips-linux-nat.c	Wed Jul  4 15:46:03 2001
@@ -0,0 +1,33 @@
+/* Native-dependent code for Linux/MIPS.
+   Copyright 1996, 2001 Free Software Foundation, Inc.
+
+   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
+   Rutgers University CAIP Research Center.
+
+   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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sys/user.h>
+
+/* Return the size of the user struct.  */
+
+int
+kernel_u_size (void)
+{
+  return (sizeof (struct user));
+}
+  
Index: gdb/config/mips/xm-linux.h
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/xm-linux.h
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/xm-linux.h	Wed Jul  4 16:27:53 2001
@@ -0,0 +1,43 @@
+/* Host definitions for Linux/MIPS.
+   Copyright 1996, 2001 Free Software Foundation, Inc.
+
+   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
+   Rutgers University CAIP Research Center.
+
+   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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef XM_MIPSLINUX_H
+#define XM_MIPSLINUX_H
+
+#ifndef HOST_BYTE_ORDER
+#include <endian.h>
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define HOST_BYTE_ORDER BIG_ENDIAN
+#else
+#define HOST_BYTE_ORDER LITTLE_ENDIAN
+#endif
+#endif
+
+#define HAVE_TERMIOS
+
+#define NEED_POSIX_SETPGID
+
+/* Need R_OK etc, but USG isn't defined.  */
+#include <unistd.h>
+
+#endif /* XM_MIPSLINUX_H */
Index: gdb/config/mips/tm-linux.h
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/tm-linux.h
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/tm-linux.h	Thu Jul  5 15:59:13 2001
@@ -0,0 +1,93 @@
+/* Target-dependent definitions for Linux/MIPS.
+   Copyright 1996, 2001 Free Software Foundation, Inc.
+
+   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
+   Rutgers University CAIP Research Center.
+
+   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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef TM_MIPSLINUX_H
+#define TM_MIPSLINUX_H
+
+#include "mips/tm-mips.h"
+
+/* We don't want to inherit tm-mips.h's shared library trampoline code.  */
+
+#undef IN_SOLIB_CALL_TRAMPOLINE
+#undef IN_SOLIB_RETURN_TRAMPOLINE
+#undef SKIP_TRAMPOLINE_CODE
+#undef IGNORE_HELPER_CALL
+
+/* FIXME: Do not include "tm-linux.h", because we do not want the host's
+   <signal.h>.  Instead, copy the non-signal bits for now.  */
+
+/* We need this file for the SOLIB_TRAMPOLINE stuff.  */
+
+#include "tm-sysv4.h"
+
+/* We define SVR4_SHARED_LIBS unconditionally, on the assumption that
+   link.h is available on all linux platforms.  For I386 and SH3/4,
+   we hard-code the information rather than use link.h anyway (for
+   the benefit of cross-debugging).  We may move to doing that for
+   other architectures as well.  */
+
+#define SVR4_SHARED_LIBS
+#include "solib.h"              /* Support for shared libraries.  */
+
+/* End from "tm-linux.h".  */
+
+/* There's an E_MIPS_ABI_O32 flag in e_flags, but we don't use it - in
+   fact, using it may violate the o32 ABI.  */
+
+#define MIPS_DEFAULT_ABI MIPS_ABI_O32
+
+/* Linux/MIPS has __SIGRTMAX == 127.  */
+
+#define REALTIME_LO 32
+#define REALTIME_HI 128
+
+/* Use target_specific function to define link map offsets.  */
+
+extern struct link_map_offsets *mips_linux_svr4_fetch_link_map_offsets (void);
+#define SVR4_FETCH_LINK_MAP_OFFSETS() \
+  mips_linux_svr4_fetch_link_map_offsets ()
+
+/* Details about jmp_buf.  */
+
+#define JB_ELEMENT_SIZE 4
+#define JB_PC 0
+
+/* Figure out where the longjmp will land.  Slurp the arguments out of the
+   stack.  We expect the first arg to be a pointer to the jmp_buf structure
+   from which we extract the pc (JB_PC) that we will land at.  The pc is
+   copied into ADDR.  This routine returns 1 on success.  */
+
+#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
+extern int get_longjmp_target (CORE_ADDR *);
+
+/* We do single stepping in software.  */
+
+#define SOFTWARE_SINGLE_STEP_P() 1
+#define SOFTWARE_SINGLE_STEP(sig,bp_p) mips_software_single_step (sig, bp_p)
+
+/* FIXME: This still needs to be implemented.  */
+
+#undef  IN_SIGTRAMP
+#define IN_SIGTRAMP(pc, name)	(0)
+
+#endif /* TM_MIPSLINUX_H */
Index: gdb/config/mips/nm-linux.h
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/nm-linux.h
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/nm-linux.h	Fri Jul  6 14:02:28 2001
@@ -0,0 +1,83 @@
+/* Native-dependent definitions for Linux/MIPS.
+   Copyright 1996, 2001 Free Software Foundation, Inc.
+
+   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
+   Rutgers University CAIP Research Center.
+
+   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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef NM_MIPSLINUX_H
+#define NM_MIPSLINUX_H
+
+#define MIPS_GNULINUX_TARGET
+
+#include "nm-linux.h"
+
+/* Return sizeof user struct to callers in less machine dependent
+   routines.  */
+
+extern int kernel_u_size (void);
+#define KERNEL_U_SIZE kernel_u_size()
+
+/* ptrace register ``addresses'' are absolute.  */
+
+#define U_REGS_OFFSET 0
+
+/* ptrace transfers longs, and expects addresses as longs.  */
+
+#define PTRACE_ARG3_TYPE long
+#define PTRACE_XFER_TYPE long
+
+#define REGISTER_U_ADDR(addr, blockend, regno) \
+  (addr) = mips_register_addr ((regno),(blockend))
+
+/* Pseudo registers can not be read.  ptrace does not provide a way to
+   read (or set) PS_REGNUM, and there's no point in reading or setting
+   ZERO_REGNUM.  We also can not set BADVADDR, CAUSE, or FCRIR via
+   ptrace().  These macros only apply to the ptrace() code, as kgdb
+   has different restrictions.  */
+
+#define CANNOT_FETCH_REGISTER(regno) \
+  ((regno) >= FP_REGNUM \
+   || (regno) == PS_REGNUM \
+   || (regno) == ZERO_REGNUM)
+#define CANNOT_STORE_REGISTER(regno) \
+  ((regno) >= FP_REGNUM \
+   || (regno) == PS_REGNUM \
+   || (regno) == ZERO_REGNUM \
+   || (regno) == BADVADDR_REGNUM \
+   || (regno) == CAUSE_REGNUM \
+   || (regno) == FCRIR_REGNUM)
+
+/* FIXME: This should be moved to ../nm-linux.h once we have converted all
+   Linux targets to use the new threads stuff (without the #undef of
+   course).  */
+
+extern int lin_lwp_prepare_to_proceed (void);
+#undef PREPARE_TO_PROCEED
+#define PREPARE_TO_PROCEED(select_it) lin_lwp_prepare_to_proceed ()
+
+extern void lin_lwp_attach_lwp (ptid_t ptid, int verbose);
+#define ATTACH_LWP(ptid, verbose) lin_lwp_attach_lwp ((ptid), (verbose))
+
+#include <signal.h>
+
+extern void lin_thread_get_thread_signals (sigset_t *mask);
+#define GET_THREAD_SIGNALS(mask) lin_thread_get_thread_signals (mask)
+
+#endif /* NM_MIPSLINUX_H */
Index: gdb/config/mips/linux.mh
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/linux.mh
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/linux.mh	Wed Jul  4 16:05:51 2001
@@ -0,0 +1,8 @@
+# Host: Linux/MIPS
+XDEPFILES=
+XM_FILE= xm-linux.h
+NAT_FILE= nm-linux.h
+NATDEPFILES= infptrace.o inftarg.o fork-child.o mips-linux-nat.o \
+	thread-db.o lin-lwp.o proc-service.o
+
+LOADLIBES = -ldl -rdynamic
Index: gdb/config/mips/linux.mt
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/linux.mt
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/linux.mt	Wed Jul  4 16:06:00 2001
@@ -0,0 +1,9 @@
+# Target: Linux/MIPS
+TDEPFILES= mips-tdep.o mips-linux-tdep.o corelow.o \
+	solib.o solib-svr4.o
+TM_FILE= tm-linux.h
+
+GDBSERVER_DEPFILES= low-linux.o
+
+SIM_OBS = remote-sim.o
+SIM = ../sim/mips/libsim.a
Index: gdb/NEWS
===================================================================
RCS file: /cvs/src/src/gdb/NEWS,v
retrieving revision 1.26
diff -u -r1.26 NEWS
--- gdb/NEWS	2001/06/28 19:04:10	1.26
+++ gdb/NEWS	2001/07/06 22:08:43
@@ -14,6 +14,7 @@
 
 Alpha FreeBSD					alpha*-*-freebsd*
 x86 FreeBSD 3.x and 4.x				i[3456]86*-freebsd[34]*
+MIPS Linux					mips{,el}-*-linux*
 
 * New targets
 
Index: gdb/configure.host
===================================================================
RCS file: /cvs/src/src/gdb/configure.host,v
retrieving revision 1.22
diff -u -r1.22 configure.host
--- gdb/configure.host	2001/06/15 19:23:45	1.22
+++ gdb/configure.host	2001/07/06 22:08:43
@@ -16,6 +16,7 @@
 i[3456]86*)		gdb_host_cpu=i386 ;;
 m68*)			gdb_host_cpu=m68k ;;
 m88*)			gdb_host_cpu=m88k ;;
+mips*)			gdb_host_cpu=mips ;;
 powerpc*)		gdb_host_cpu=powerpc ;;
 sparc64)		gdb_host_cpu=sparc ;;
 s390*)			gdb_host_cpu=s390 ;;
@@ -118,6 +119,7 @@
 mips-sgi-irix5*)	gdb_host=irix5 ;;
 mips-sgi-irix6*)	gdb_host=irix6 ;;
 mips-sony-*)		gdb_host=news-mips ;;
+mips*-*-linux*)		gdb_host=linux ;;
 mips-*-mach3*)		gdb_host=mipsm3 ;;
 mips-*-sysv4*)		gdb_host=mipsv4 ;;
 mips-*-sysv*)		gdb_host=riscos ;;
Index: gdb/configure.tgt
===================================================================
RCS file: /cvs/src/src/gdb/configure.tgt,v
retrieving revision 1.30
diff -u -r1.30 configure.tgt
--- gdb/configure.tgt	2001/06/15 19:23:45	1.30
+++ gdb/configure.tgt	2001/07/06 22:08:43
@@ -211,6 +211,7 @@
 mips*-sgi-irix6*)	gdb_target=irix6 ;;
 mips*-sgi-*)		gdb_target=irix3 ;;
 mips*-sony-*)		gdb_target=bigmips ;;
+mips*-*-linux*)		gdb_target=linux ;;
 mips*-*-mach3*)		gdb_target=mipsm3 ;;
 mips*-*-sysv4*)		gdb_target=mipsv4 ;;
 mips*-*-sysv*)		gdb_target=bigmips ;;

Re: [rfa] MIPS/Linux, take 3

[Andrew Cagney]

Daniel, see attached.  One big glitch, copyright, sigh.

	Andrew
From fnasser@cygnus.com Mon Jul 09 13:25:00 2001
From: Fernando Nasser <fnasser@cygnus.com>
To: Michael Snyder <msnyder@cygnus.com>
Cc: gdb-patches@sources.redhat.com
Subject: Re: [PATCH RFA] ending-run.exp
Date: Mon, 09 Jul 2001 13:25:00 -0000
Message-id: <3B4A132E.AA2DE377@cygnus.com>
References: <3B40EB11.A026F84D@cygnus.com>
X-SW-Source: 2001-07/msg00205.html
Content-length: 995

Michael Snyder wrote:
> 
> This script seems to expect that, if you step past the return from main,
> you will end up in some sort of "start" function.
> 
> Can anyone think of any reason why "Program exited normally" is not
> a legitimate output to see after stepping past the return from main?
> 

Sorry for the delay, I was on vacation.

Well, main() is normally called from inside crt0  from some sort of "start" function.  When you step past the return from main you should return to the frame above main, i.e., to after the call to main inside the "start" function in crt0.

If it is not stopping there it is either a bug or some new situation that did not use to exist.

I don't think we should accept "Program exited normally" until we understand a little bit more of what is actually happening when we get this message.

Regards,
Fernando

-- 
Fernando Nasser
Red Hat - Toronto                       E-Mail:  fnasser@redhat.com
2323 Yonge Street, Suite #300
Toronto, Ontario   M4P 2C9

Re: [rfa] MIPS/Linux, take 3

[Daniel Jacobowitz]

I've tried three times now to get a response from David about this,
without a word of response.  What I will do at this stage is rewrite
the last remaining bits.  The bulk of what you see here is not David's
code any longer; I only left the contributed notice out of courtesy,
since I was basing my work on his.  I'll repost the patch with the very
few remaining pieces and the notices removed.  That's legitimate, by my
understanding - right?

On Mon, Jul 09, 2001 at 03:04:27PM -0400, Andrew Cagney wrote:
> > 2001-07-06  Daniel Jacobowitz  <drow@mvista.com>
> > 
> > 	* mips-linux-tdep.c: New file.
> > 	* mips-linux-nat.c: New file.
> > 	* config/mips/linux.mh: New file.
> > 	* config/mips/linux.mt: New file.
> > 	* config/mips/xm-linux.h: New file.
> > 	* config/mips/nm-linux.h: New file.
> > 	* config/mips/tm-linux.h: New file.
> > 	* configure.host: Recognize mips*-*-linux.
> 
> To be pedantic, mips*-*-linux*.

Sure.  Just the changelog is wrong.

> > --- /dev/null	Wed Dec 31 16:00:00 1969
> > +++ gdb/mips-linux-tdep.c	Wed Jul  4 16:33:13 2001
> > @@ -0,0 +1,313 @@
> > +/* Target-dependent code for Linux/MIPS.
> > +   Copyright 1996, 2001 Free Software Foundation, Inc.
> > +
> > +   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
> > +   Rutgers University CAIP Research Center.
> 
> Um, there isn't anything showing that Rutgers University disclaimed
> work by David S. Miller back in '96.  Rutgers Uni does have several
> other disclaimers on file.  Daniel, could you please you dig a little
> bit more into the history of these files.
> 
> Sigh.

See above.

> > +/* Copied from <asm/elf.h>.  */
> > +#define ELF_NGREG       45
> > +#define ELF_NFPREG      33
> 
> Strongly recommend using enum's for this.  Check what Michael Snyder
> did to the SPARC. He says that he never looked back.
> 
> > +/* 0 - 31 are integer registers, 32 - 63 are fp registers.  */
> > +#define FPR_BASE        32
> > +#define PC              64
> > +#define CAUSE           65
> > +#define BADVADDR        66
> > +#define MMHI            67
> > +#define MMLO            68
> > +#define FPC_CSR         69
> > +#define FPC_EIR         70
> 
> You may want to name space proof these with some sort of prefix? Don't
> know.

As the headers say, I just copied these from kernel headers; the
functions using them used to be in the -nat file and include the kernel
headers.  I'll look into improving how this is handled later, but for
now I'd prefer to leave the names as they are.

> > +    supply_register ((regi - EF_REG0), (char *)(regp + regi));
> 
> Just FYI, you don't need the cast and in general people are removing
> them.

OK, I'll kill it.  Thanks.

> > +#define fill(regp, regi, offset)			\
> > +	  memcpy((char *)((regp) + (offset)),		\
> > +		 &registers[REGISTER_BYTE (regi)],	\
> > +		 sizeof (elf_greg_t))
> 
> Hmm, this technique has become the norm in this code :-/

Alas :)  I'll clean up these functions as soon as I get a chance;
they're a little obtuse.

> > +	  from = (char *) &registers[REGISTER_BYTE (regi + FP0_REGNUM)];
> > +	  to = (char *) (*fpregsetp + regi);
> 
> This is pretty good code, at least someone can step through it and see
> what exactly it is doing.  (Is the cast avoidable?).

Ditto.

> > +/* Map gdb internal register number to ptrace ``address''.
> > +   These ``addresses'' are defined in <asm/ptrace.h>.  */
> > +
> > +#define REGISTER_PTRACE_ADDR(regno)		\
> > +   (regno < 32 ? 		regno  		\
> > +  : (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) ?		\
> > +				FPR_BASE + (regno - FP0_REGNUM)	\
> > +  : regno == PC_REGNUM ?	PC		\
> > +  : regno == CAUSE_REGNUM ?	CAUSE		\
> > +  : regno == BADVADDR_REGNUM ?	BADVADDR	\
> > +  : regno == LO_REGNUM ?	MMLO		\
> > +  : regno == HI_REGNUM ?	MMHI		\
> > +  : regno == FCRCS_REGNUM ?	FPC_CSR		\
> > +  : regno == FCRIR_REGNUM ?	FPC_EIR		\
> > +  : 0)
> 
> Could you please change this to a function.

Certainly.

> > +void
> > +_initialize_core_regset ()
> > +{
> > +  add_core_fns (&regset_core_fns);
> > +}
> 
> Can you please change the function name to
> _initialize_mips_linux_tdep() to match the .c file and move it to the
> bottom.

Ditto.

> > Index: gdb/mips-linux-nat.c
> > ===================================================================
> > RCS file: N/A
> > diff -u /dev/null gdb/mips-linux-nat.c
> > --- /dev/null	Wed Dec 31 16:00:00 1969
> > +++ gdb/mips-linux-nat.c	Wed Jul  4 15:46:03 2001
> 
> I would suggest deleting this file and then committing something based
> on ppc-linux-nat.c.  The result of doing that is approved.

Given the contents of this file (byte for byte identical to the parts
of ppc-linux-nat that are relevant) that's easy enough.

> > Index: gdb/config/mips/xm-linux.h
> > ===================================================================
> > RCS file: N/A
> > diff -u /dev/null gdb/config/mips/xm-linux.h
> > --- /dev/null	Wed Dec 31 16:00:00 1969
> > +++ gdb/config/mips/xm-linux.h	Wed Jul  4 16:27:53 2001
> 
> > +   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
> > +   Rutgers University CAIP Research Center.
> 
> Again suggest deleting this file and implementing something based on
> config/powerpc/xm-linux.h.  The result of doing that is approved.

As above, easy enough.  Will do.

> > +#ifndef HOST_BYTE_ORDER
> > +#include <endian.h>
> > +#if __BYTE_ORDER == __BIG_ENDIAN
> > +#define HOST_BYTE_ORDER BIG_ENDIAN
> > +#else
> > +#define HOST_BYTE_ORDER LITTLE_ENDIAN
> > +#endif
> > +#endif
> 
> I'm working on it :-)

If anything was ever screaming for autoconf... :)

> > +#define HAVE_TERMIOS
> 
> Is this needed?

I'll double-check.  It's in every other xm-linux.h.

> > Index: gdb/config/mips/tm-linux.h
> > ===================================================================
> > RCS file: N/A
> > diff -u /dev/null gdb/config/mips/tm-linux.h
> > --- /dev/null	Wed Dec 31 16:00:00 1969
> > +++ gdb/config/mips/tm-linux.h	Thu Jul  5 15:59:13 2001
> > @@ -0,0 +1,93 @@
> 
> > +   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
> > +   Rutgers University CAIP Research Center.
> 
> See above about copyright.  Otherwize approved (but see below).
> 
> > +#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
> > +extern int get_longjmp_target (CORE_ADDR *);
> 
> If this is a mips specific function then this should be called
> mips_get_longjmp_target().

I'll correct that.

> > Index: gdb/config/mips/nm-linux.h
> > ===================================================================
> > RCS file: N/A
> > diff -u /dev/null gdb/config/mips/nm-linux.h
> > --- /dev/null	Wed Dec 31 16:00:00 1969
> > +++ gdb/config/mips/nm-linux.h	Fri Jul  6 14:02:28 2001
> > @@ -0,0 +1,83 @@
> 
> > +   Originally contributed by David S. Miller (davem@caip.rutgers.edu) at
> > +   Rutgers University CAIP Research Center.
> 
> Appart from the copyright problem, approved (but see below).
> 
> > +#define CANNOT_FETCH_REGISTER(regno) \
> > +  ((regno) >= FP_REGNUM \
> > +   || (regno) == PS_REGNUM \
> > +   || (regno) == ZERO_REGNUM)
> > +#define CANNOT_STORE_REGISTER(regno) \
> > +  ((regno) >= FP_REGNUM \
> > +   || (regno) == PS_REGNUM \
> > +   || (regno) == ZERO_REGNUM \
> > +   || (regno) == BADVADDR_REGNUM \
> > +   || (regno) == CAUSE_REGNUM \
> > +   || (regno) == FCRIR_REGNUM)
> 
> Please change this to a function.

Will do.

> > Index: gdb/config/mips/linux.mh
> > Index: gdb/config/mips/linux.mt
> 
> Both approved.
> 
> 
> > Index: gdb/NEWS
> > ===================================================================
> > RCS file: /cvs/src/src/gdb/NEWS,v
> > retrieving revision 1.26
> > diff -u -r1.26 NEWS
> > --- gdb/NEWS	2001/06/28 19:04:10	1.26
> > +++ gdb/NEWS	2001/07/06 22:08:43
> > @@ -14,6 +14,7 @@
> >  
> >  Alpha FreeBSD					alpha*-*-freebsd*
> >  x86 FreeBSD 3.x and 4.x				i[3456]86*-freebsd[34]*
> > +MIPS Linux					mips{,el}-*-linux*
> 
> Suggest using just ``mips*-*-linux''.  To be pedantic,
> mipseb-unknown-linux-gnu is also accepted.

That makes sense.  Sure.

> OK with me, news items don't need approval.
> 
> > Index: gdb/configure.host
> 
> OK with me, configury changes don't need approval.
> 
> > Index: gdb/configure.tgt
> 
> OK with me, configury changes don't need approval.
> 
> 	Andrew


-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

Re: [rfa] MIPS/Linux, take 3

[Daniel Jacobowitz]

On Mon, Jul 09, 2001 at 03:04:27PM -0400, Andrew Cagney wrote:
> > +    supply_register ((regi - EF_REG0), (char *)(regp + regi));
> 
> Just FYI, you don't need the cast and in general people are removing
> them.

I don't get it.  What do you mean by "don't need the cast"?  I get a
warning without it.


-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

Re: [rfa] MIPS/Linux, take 3

[Andrew Cagney]

> On Mon, Jul 09, 2001 at 03:04:27PM -0400, Andrew Cagney wrote:
> 
>> > +    supply_register ((regi - EF_REG0), (char *)(regp + regi));
> 
>> 
>> Just FYI, you don't need the cast and in general people are removing
>> them.
> 
> 
> I don't get it.  What do you mean by "don't need the cast"?  I get a
> warning without it.


Grumph, sorry, never mind.

regcache.h:extern void supply_register (int regnum, char *val);

Feel motivated enough to file a PR against it?

	Andrew

Re: [rfa] MIPS/Linux, take 3

[Daniel Jacobowitz]

Here's a version of the patch with all outstanding issues resolved -
copyright included; I punted and rewrote most of the remaining bits. 
This should be mostly OK, but I'd appreciate a last eyeballing of it
before I commit.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

2001-07-10  Daniel Jacobowitz  <drow@mvista.com>

	* mips-linux-tdep.c: New file.
	* mips-linux-nat.c: New file.
	* config/mips/linux.mh: New file.
	* config/mips/linux.mt: New file.
	* config/mips/xm-linux.h: New file.
	* config/mips/nm-linux.h: New file.
	* config/mips/tm-linux.h: New file.
	* configure.host: Recognize mips*-*-linux*.
	* configure.tgt: Likewise.
	* NEWS: Mention mips*-*-linux* port.

Index: gdb/mips-linux-tdep.c
===================================================================
RCS file: N/A
diff -u /dev/null gdb/mips-linux-tdep.c
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/mips-linux-tdep.c	Tue Jul 10 12:18:23 2001
@@ -0,0 +1,344 @@
+/* Target-dependent code for Linux/MIPS.
+   Copyright 2001 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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "gdbcore.h"
+#include "target.h"
+#include "solib-svr4.h"
+
+/* Copied from <asm/elf.h>.  */
+#define ELF_NGREG       45
+#define ELF_NFPREG      33
+
+typedef unsigned char elf_greg_t[4];
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef unsigned char elf_fpreg_t[8];
+typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
+
+/* 0 - 31 are integer registers, 32 - 63 are fp registers.  */
+#define FPR_BASE        32
+#define PC              64
+#define CAUSE           65
+#define BADVADDR        66
+#define MMHI            67
+#define MMLO            68
+#define FPC_CSR         69
+#define FPC_EIR         70
+
+#define EF_REG0			6
+#define EF_REG31		37
+#define EF_LO			38
+#define EF_HI			39
+#define EF_CP0_EPC		40
+#define EF_CP0_BADVADDR		41
+#define EF_CP0_STATUS		42
+#define EF_CP0_CAUSE		43
+
+#define EF_SIZE			180
+
+/* Figure out where the longjmp will land.
+   We expect the first arg to be a pointer to the jmp_buf structure from
+   which we extract the pc (JB_PC) that we will land at.  The pc is copied
+   into PC.  This routine returns 1 on success.  */
+
+int
+mips_linux_get_longjmp_target (CORE_ADDR *pc)
+{
+  CORE_ADDR jb_addr;
+  char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
+
+  jb_addr = read_register (A0_REGNUM);
+
+  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
+			  TARGET_PTR_BIT / TARGET_CHAR_BIT))
+    return 0;
+
+  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+
+  return 1;
+}
+
+/* Unpack an elf_gregset_t into GDB's register cache.  */
+
+void 
+supply_gregset (elf_gregset_t *gregsetp)
+{
+  int regi;
+  elf_greg_t *regp = *gregsetp;
+  static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+
+  for (regi = EF_REG0; regi <= EF_REG31; regi++)
+    supply_register ((regi - EF_REG0), (char *)(regp + regi));
+
+  supply_register (LO_REGNUM, (char *)(regp + EF_LO));
+  supply_register (HI_REGNUM, (char *)(regp + EF_HI));
+
+  supply_register (PC_REGNUM, (char *)(regp + EF_CP0_EPC));
+  supply_register (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR));
+  supply_register (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
+  supply_register (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE));
+
+  /* Fill inaccessible registers with zero.  */
+  supply_register (FP_REGNUM, zerobuf);
+  supply_register (UNUSED_REGNUM, zerobuf);
+  for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
+    supply_register (regi, zerobuf);
+}
+
+/* Pack our registers (or one register) into an elf_gregset_t.  */
+
+void
+fill_gregset (elf_gregset_t *gregsetp, int regno)
+{
+  int regaddr, regi;
+  elf_greg_t *regp = *gregsetp;
+  void *src, *dst;
+
+  if (regno == -1)
+    {
+      memset (regp, 0, sizeof (elf_gregset_t));
+      for (regi = 0; regi < 32; regi++)
+        fill_gregset (gregsetp, regi);
+      fill_gregset (gregsetp, LO_REGNUM);
+      fill_gregset (gregsetp, HI_REGNUM);
+      fill_gregset (gregsetp, PC_REGNUM);
+      fill_gregset (gregsetp, BADVADDR_REGNUM);
+      fill_gregset (gregsetp, PS_REGNUM);
+      fill_gregset (gregsetp, CAUSE_REGNUM);
+
+      return;
+   }
+
+  if (regno < 32)
+    {
+      src = &registers[REGISTER_BYTE (regno)];
+      dst = regp + regno + EF_REG0;
+      memcpy (dst, src, sizeof (elf_greg_t));
+      return;
+    }
+
+  regaddr = -1;
+  switch (regno)
+    {
+      case LO_REGNUM:
+	regaddr = EF_LO;
+	break;
+      case HI_REGNUM:
+	regaddr = EF_HI;
+	break;
+      case PC_REGNUM:
+	regaddr = EF_CP0_EPC;
+	break;
+      case BADVADDR_REGNUM:
+	regaddr = EF_CP0_BADVADDR;
+	break;
+      case PS_REGNUM:
+	regaddr = EF_CP0_STATUS;
+	break;
+      case CAUSE_REGNUM:
+	regaddr = EF_CP0_CAUSE;
+	break;
+    }
+
+  if (regaddr != -1)
+    {
+      src = &registers[REGISTER_BYTE (regno)];
+      dst = regp + regaddr;
+      memcpy (dst, src, sizeof (elf_greg_t));
+    }
+}
+
+/* Likewise, unpack an elf_fpregset_t.  */
+
+void
+supply_fpregset (elf_fpregset_t *fpregsetp)
+{
+  register int regi;
+  static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+
+  for (regi = 0; regi < 32; regi++)
+    supply_register (FP0_REGNUM + regi,
+		     (char *)(*fpregsetp + regi));
+
+  supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32));
+
+  /* FIXME: how can we supply FCRIR_REGNUM?  The ABI doesn't tell us. */
+  supply_register (FCRIR_REGNUM, zerobuf);
+}
+
+/* Likewise, pack one or all floating point registers into an
+   elf_fpregset_t.  */
+
+void
+fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
+{
+  char *from, *to;
+
+  if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
+    {
+      from = (char *) &registers[REGISTER_BYTE (regno)];
+      to = (char *) (*fpregsetp + regno - FP0_REGNUM);
+      memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM));
+    }
+  else if (regno == FCRCS_REGNUM)
+    {
+      from = (char *) &registers[REGISTER_BYTE (regno)];
+      to = (char *) (*fpregsetp + 32);
+      memcpy (to, from, REGISTER_RAW_SIZE (regno));
+    }
+  else if (regno == -1)
+    {
+      int regi;
+
+      for (regi = 0; regi < 32; regi++)
+	fill_fpregset (fpregsetp, FP0_REGNUM + regi);
+      fill_fpregset(fpregsetp, FCRCS_REGNUM);
+    }
+}
+
+/* Map gdb internal register number to ptrace ``address''.
+   These ``addresses'' are normally defined in <asm/ptrace.h>.  */
+
+CORE_ADDR
+register_addr (int regno, CORE_ADDR blockend)
+{
+  int regaddr;
+
+  if (regno < 0 || regno >= NUM_REGS)
+    error ("Bogon register number %d.", regno);
+
+  if (regno < 32)
+    regaddr = regno;
+  else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
+    regaddr = FPR_BASE + (regno - FP0_REGNUM);
+  else if (regno == PC_REGNUM)
+    regaddr = PC;
+  else if (regno == CAUSE_REGNUM)
+    regaddr = CAUSE;
+  else if (regno == BADVADDR_REGNUM)
+    regaddr = BADVADDR;
+  else if (regno == LO_REGNUM)
+    regaddr = MMLO;
+  else if (regno == HI_REGNUM)
+    regaddr = MMHI;
+  else if (regno == FCRCS_REGNUM)
+    regaddr = FPC_CSR;
+  else if (regno == FCRIR_REGNUM)
+    regaddr = FPC_EIR;
+  else
+    error ("Unknowable register number %d.", regno);
+
+  return regaddr;
+}
+
+/*  Use a local version of this function to get the correct types for
+    regsets, until multi-arch core support is ready.  */
+
+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;
+
+  if (which == 0)
+    {
+      if (core_reg_size != sizeof (gregset))
+	{
+	  warning ("wrong size gregset struct in core file");
+	}
+      else
+	{
+	  memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
+	  supply_gregset (&gregset);
+	}
+    }
+  else if (which == 2)
+    {
+      if (core_reg_size != sizeof (fpregset))
+	{
+	  warning ("wrong size fpregset struct in core file");
+	}
+      else
+	{
+	  memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
+	  supply_fpregset (&fpregset);
+	}
+    }
+}
+
+/* Register that we are able to handle ELF file formats using standard
+   procfs "regset" structures.  */
+
+static struct core_fns regset_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 */
+};
+
+/* Fetch (and possibly build) an appropriate link_map_offsets
+   structure for native Linux/MIPS targets using the struct offsets
+   defined in link.h (but without actual reference to that file).
+
+   This makes it possible to access Linux/MIPS shared libraries from a
+   GDB that was not built on an Linux/MIPS host (for cross debugging).  */
+
+struct link_map_offsets *
+mips_linux_svr4_fetch_link_map_offsets (void)
+{ 
+  static struct link_map_offsets lmo;
+  static struct link_map_offsets *lmp = NULL;
+
+  if (lmp == NULL)
+    { 
+      lmp = &lmo;
+
+      lmo.r_debug_size = 8;	/* The actual size is 20 bytes, but
+				   this is all we need.  */
+      lmo.r_map_offset = 4;
+      lmo.r_map_size   = 4;
+
+      lmo.link_map_size = 20;
+
+      lmo.l_addr_offset = 0;
+      lmo.l_addr_size   = 4;
+
+      lmo.l_name_offset = 4;
+      lmo.l_name_size   = 4;
+
+      lmo.l_next_offset = 12;
+      lmo.l_next_size   = 4;
+
+      lmo.l_prev_offset = 16;
+      lmo.l_prev_size   = 4;
+    }
+
+  return lmp;
+}
+
+void
+_initialize_mips_linux_tdep ()
+{
+  add_core_fns (&regset_core_fns);
+}
Index: gdb/mips-linux-nat.c
===================================================================
RCS file: N/A
diff -u /dev/null gdb/mips-linux-nat.c
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/mips-linux-nat.c	Mon Jul  9 17:32:55 2001
@@ -0,0 +1,58 @@
+/* Native-dependent code for Linux/MIPS.
+   Copyright 2001 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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+
+/* Pseudo registers can not be read.  ptrace does not provide a way to
+   read (or set) PS_REGNUM, and there's no point in reading or setting
+   ZERO_REGNUM.  We also can not set BADVADDR, CAUSE, or FCRIR via
+   ptrace().  */
+
+int
+mips_linux_cannot_fetch_register (int regno)
+{
+  if (regno >= FP_REGNUM)
+    return 1;
+  else if (regno == PS_REGNUM)
+    return 1;
+  else if (regno == ZERO_REGNUM)
+    return 1;
+  else
+    return 0;
+}
+
+int
+mips_linux_cannot_store_register (int regno)
+{
+  if (regno >= FP_REGNUM)
+    return 1;
+  else if (regno == PS_REGNUM)
+    return 1;
+  else if (regno == ZERO_REGNUM)
+    return 1;
+  else if (regno == BADVADDR_REGNUM)
+    return 1;
+  else if (regno == CAUSE_REGNUM)
+    return 1;
+  else if (regno == FCRIR_REGNUM)
+    return 1;
+  else
+    return 0;
+}
Index: gdb/config/mips/xm-linux.h
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/xm-linux.h
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/xm-linux.h	Mon Jul  9 17:40:09 2001
@@ -0,0 +1,36 @@
+/* Host definitions for Linux/MIPS.
+   Copyright 2001 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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef XM_MIPSLINUX_H
+#define XM_MIPSLINUX_H
+
+#ifndef HOST_BYTE_ORDER
+#include <endian.h>
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define HOST_BYTE_ORDER BIG_ENDIAN
+#else
+#define HOST_BYTE_ORDER LITTLE_ENDIAN
+#endif
+#endif
+
+/* Need R_OK etc, but USG isn't defined.  */
+#include <unistd.h>
+
+#endif /* XM_MIPSLINUX_H */
Index: gdb/config/mips/tm-linux.h
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/tm-linux.h
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/tm-linux.h	Mon Jul  9 16:18:21 2001
@@ -0,0 +1,90 @@
+/* Target-dependent definitions for Linux/MIPS.
+   Copyright 2001 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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef TM_MIPSLINUX_H
+#define TM_MIPSLINUX_H
+
+#include "mips/tm-mips.h"
+
+/* We don't want to inherit tm-mips.h's shared library trampoline code.  */
+
+#undef IN_SOLIB_CALL_TRAMPOLINE
+#undef IN_SOLIB_RETURN_TRAMPOLINE
+#undef SKIP_TRAMPOLINE_CODE
+#undef IGNORE_HELPER_CALL
+
+/* FIXME: Do not include "tm-linux.h", because we do not want the host's
+   <signal.h>.  Instead, copy the non-signal bits for now.  */
+
+/* We need this file for the SOLIB_TRAMPOLINE stuff.  */
+
+#include "tm-sysv4.h"
+
+/* We define SVR4_SHARED_LIBS unconditionally, on the assumption that
+   link.h is available on all linux platforms.  For I386 and SH3/4,
+   we hard-code the information rather than use link.h anyway (for
+   the benefit of cross-debugging).  We may move to doing that for
+   other architectures as well.  */
+
+#define SVR4_SHARED_LIBS
+#include "solib.h"              /* Support for shared libraries.  */
+
+/* End from "tm-linux.h".  */
+
+/* There's an E_MIPS_ABI_O32 flag in e_flags, but we don't use it - in
+   fact, using it may violate the o32 ABI.  */
+
+#define MIPS_DEFAULT_ABI MIPS_ABI_O32
+
+/* Linux/MIPS has __SIGRTMAX == 127.  */
+
+#define REALTIME_LO 32
+#define REALTIME_HI 128
+
+/* Use target_specific function to define link map offsets.  */
+
+extern struct link_map_offsets *mips_linux_svr4_fetch_link_map_offsets (void);
+#define SVR4_FETCH_LINK_MAP_OFFSETS() \
+  mips_linux_svr4_fetch_link_map_offsets ()
+
+/* Details about jmp_buf.  */
+
+#define JB_ELEMENT_SIZE 4
+#define JB_PC 0
+
+/* Figure out where the longjmp will land.  Slurp the arguments out of the
+   stack.  We expect the first arg to be a pointer to the jmp_buf structure
+   from which we extract the pc (JB_PC) that we will land at.  The pc is
+   copied into ADDR.  This routine returns 1 on success.  */
+
+#define GET_LONGJMP_TARGET(ADDR) mips_linux_get_longjmp_target(ADDR)
+extern int mips_linux_get_longjmp_target (CORE_ADDR *);
+
+/* We do single stepping in software.  */
+
+#define SOFTWARE_SINGLE_STEP_P() 1
+#define SOFTWARE_SINGLE_STEP(sig,bp_p) mips_software_single_step (sig, bp_p)
+
+/* FIXME: This still needs to be implemented.  */
+
+#undef  IN_SIGTRAMP
+#define IN_SIGTRAMP(pc, name)	(0)
+
+#endif /* TM_MIPSLINUX_H */
Index: gdb/config/mips/nm-linux.h
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/nm-linux.h
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/nm-linux.h	Mon Jul  9 17:34:26 2001
@@ -0,0 +1,66 @@
+/* Native-dependent definitions for Linux/MIPS.
+   Copyright 1996, 2001 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
+   (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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef NM_MIPSLINUX_H
+#define NM_MIPSLINUX_H
+
+#define MIPS_GNULINUX_TARGET
+
+#include "nm-linux.h"
+
+/* Return sizeof user struct to callers in less machine dependent
+   routines.  Hard coded for cross-compilation friendliness. */
+
+#define KERNEL_U_SIZE 504
+
+/* ptrace register ``addresses'' are absolute.  */
+
+#define U_REGS_OFFSET 0
+
+/* ptrace transfers longs, and expects addresses as longs.  */
+
+#define PTRACE_ARG3_TYPE long
+#define PTRACE_XFER_TYPE long
+
+#define REGISTER_U_ADDR(addr, blockend, regno) \
+  (addr) = mips_register_addr ((regno),(blockend))
+
+int mips_linux_cannot_fetch_register (int regno);
+int mips_linux_cannot_store_register (int regno);
+#define CANNOT_FETCH_REGISTER(regno) mips_linux_cannot_fetch_register (regno)
+#define CANNOT_STORE_REGISTER(regno) mips_linux_cannot_store_register (regno)
+
+/* FIXME: This should be moved to ../nm-linux.h once we have converted all
+   Linux targets to use the new threads stuff (without the #undef of
+   course).  */
+
+extern int lin_lwp_prepare_to_proceed (void);
+#undef PREPARE_TO_PROCEED
+#define PREPARE_TO_PROCEED(select_it) lin_lwp_prepare_to_proceed ()
+
+extern void lin_lwp_attach_lwp (ptid_t ptid, int verbose);
+#define ATTACH_LWP(ptid, verbose) lin_lwp_attach_lwp ((ptid), (verbose))
+
+#include <signal.h>
+
+extern void lin_thread_get_thread_signals (sigset_t *mask);
+#define GET_THREAD_SIGNALS(mask) lin_thread_get_thread_signals (mask)
+
+#endif /* NM_MIPSLINUX_H */
Index: gdb/config/mips/linux.mh
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/linux.mh
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/linux.mh	Mon Jul  9 20:24:23 2001
@@ -0,0 +1,8 @@
+# Host: Linux/MIPS
+XDEPFILES=
+XM_FILE= xm-linux.h
+NAT_FILE= nm-linux.h
+NATDEPFILES= infptrace.o inftarg.o fork-child.o mips-linux-nat.o \
+	thread-db.o lin-lwp.o proc-service.o
+
+LOADLIBES = -ldl -rdynamic
Index: gdb/config/mips/linux.mt
===================================================================
RCS file: N/A
diff -u /dev/null gdb/config/mips/linux.mt
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ gdb/config/mips/linux.mt	Wed Jul  4 16:06:00 2001
@@ -0,0 +1,9 @@
+# Target: Linux/MIPS
+TDEPFILES= mips-tdep.o mips-linux-tdep.o corelow.o \
+	solib.o solib-svr4.o
+TM_FILE= tm-linux.h
+
+GDBSERVER_DEPFILES= low-linux.o
+
+SIM_OBS = remote-sim.o
+SIM = ../sim/mips/libsim.a
Index: gdb/NEWS
===================================================================
RCS file: /cvs/src/src/gdb/NEWS,v
retrieving revision 1.26
diff -u -r1.26 NEWS
--- gdb/NEWS	2001/06/28 19:04:10	1.26
+++ gdb/NEWS	2001/07/10 19:30:09
@@ -14,6 +14,7 @@
 
 Alpha FreeBSD					alpha*-*-freebsd*
 x86 FreeBSD 3.x and 4.x				i[3456]86*-freebsd[34]*
+MIPS Linux					mips*-*-linux*
 
 * New targets
 
Index: gdb/configure.host
===================================================================
RCS file: /cvs/src/src/gdb/configure.host,v
retrieving revision 1.22
diff -u -r1.22 configure.host
--- gdb/configure.host	2001/06/15 19:23:45	1.22
+++ gdb/configure.host	2001/07/10 19:30:10
@@ -16,6 +16,7 @@
 i[3456]86*)		gdb_host_cpu=i386 ;;
 m68*)			gdb_host_cpu=m68k ;;
 m88*)			gdb_host_cpu=m88k ;;
+mips*)			gdb_host_cpu=mips ;;
 powerpc*)		gdb_host_cpu=powerpc ;;
 sparc64)		gdb_host_cpu=sparc ;;
 s390*)			gdb_host_cpu=s390 ;;
@@ -118,6 +119,7 @@
 mips-sgi-irix5*)	gdb_host=irix5 ;;
 mips-sgi-irix6*)	gdb_host=irix6 ;;
 mips-sony-*)		gdb_host=news-mips ;;
+mips*-*-linux*)		gdb_host=linux ;;
 mips-*-mach3*)		gdb_host=mipsm3 ;;
 mips-*-sysv4*)		gdb_host=mipsv4 ;;
 mips-*-sysv*)		gdb_host=riscos ;;
Index: gdb/configure.tgt
===================================================================
RCS file: /cvs/src/src/gdb/configure.tgt,v
retrieving revision 1.30
diff -u -r1.30 configure.tgt
--- gdb/configure.tgt	2001/06/15 19:23:45	1.30
+++ gdb/configure.tgt	2001/07/10 19:30:10
@@ -211,6 +211,7 @@
 mips*-sgi-irix6*)	gdb_target=irix6 ;;
 mips*-sgi-*)		gdb_target=irix3 ;;
 mips*-sony-*)		gdb_target=bigmips ;;
+mips*-*-linux*)		gdb_target=linux ;;
 mips*-*-mach3*)		gdb_target=mipsm3 ;;
 mips*-*-sysv4*)		gdb_target=mipsv4 ;;
 mips*-*-sysv*)		gdb_target=bigmips ;;

Re: [rfa] MIPS/Linux, take 3

[Daniel Jacobowitz]

On Tue, Jul 10, 2001 at 03:50:53PM -0400, Andrew Cagney wrote:
> > On Mon, Jul 09, 2001 at 03:04:27PM -0400, Andrew Cagney wrote:
> > 
> >> > +    supply_register ((regi - EF_REG0), (char *)(regp + regi));
> > 
> >> 
> >> Just FYI, you don't need the cast and in general people are removing
> >> them.
> > 
> > 
> > I don't get it.  What do you mean by "don't need the cast"?  I get a
> > warning without it.
> 
> 
> Grumph, sorry, never mind.
> 
> regcache.h:extern void supply_register (int regnum, char *val);
> 
> Feel motivated enough to file a PR against it?

Sure.  I'm still not entirely clear what the right thing to do is,
though.  Play with void* instead?  It's hard to say what type the
incoming data should really be, if not char*.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

Re: [rfa] MIPS/Linux, take 3

[Andrew Cagney]

FYI,

I'd suggest sorting any remaining issues after this is committed (yes ok 
to commit).

	Andrew

Re: [rfa] MIPS/Linux, take 3

[Daniel Jacobowitz]

On Tue, Jul 10, 2001 at 04:27:02PM -0400, Andrew Cagney wrote:
> FYI,
> 
> I'd suggest sorting any remaining issues after this is committed (yes ok 
> to commit).

My feelings exactly.  Committed.

The only massive issue is gdbserver.  Since the latest multi-arch work,
it no longer comes anywhere near building, and I'm not really sure what
to do about that without bloating it distressingly.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer