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From 2112c9ded01ddd08f0e31e5ce23eecac6c04e8c4 Mon Sep 17 00:00:00 2001
From: David Holsgrove <david.holsgrove@petalogix.com>
Date: Mon, 6 Feb 2012 10:28:29 +1000
Subject: [PATCH 06/16] [Patch, microblaze]: Add initial port of linux
 gdbserver

add gdb_proc_service_h to gdbserver microblaze-linux

gdbserver needs to initialise the microblaze registers

other archs use this step to run a *_arch_setup() to carry out all
architecture specific setup - may need to add in future

 * add linux-ptrace.o to gdbserver configure
 * gdb/configure.tgt: Set build_gdbserver=yes
 * Update breakpoint opcode
 * fix segfault on connecting gdbserver
 * add microblaze_linux_memory_remove_breakpoint
 * add set_solib_svr4_fetch_link_map_offsets
 * add set_gdbarch_fetch_tls_load_module_address
 * Force reading of r0 as 0, prevent stores

Signed-off-by: David Holsgrove <david.holsgrove@petalogix.com>
Signed-off-by: Nathan Rossi <nathan.rossi@petalogix.com>
Upstream-Status: Pending
---
 gdb/configure.host                   |   3 +
 gdb/configure.tgt                    |   1 +
 gdb/gdbserver/Makefile.in            |   4 +
 gdb/gdbserver/configure.srv          |   6 +
 gdb/gdbserver/linux-microblaze-low.c | 228 +++++++++++++++++++++++++++++++++++
 gdb/microblaze-linux-tdep.c          |  25 +++-
 gdb/microblaze-tdep.c                |  45 ++++++-
 gdb/microblaze-tdep.h                |   3 +-
 gdb/regformats/reg-microblaze.dat    |  39 ++++++
 9 files changed, 348 insertions(+), 6 deletions(-)
 create mode 100644 gdb/gdbserver/linux-microblaze-low.c
 create mode 100644 gdb/regformats/reg-microblaze.dat

diff --git a/gdb/configure.host b/gdb/configure.host
index 15a8288..76cc5fe 100644
--- a/gdb/configure.host
+++ b/gdb/configure.host
@@ -59,6 +59,7 @@ i[34567]86*)		gdb_host_cpu=i386 ;;
 m68*)			gdb_host_cpu=m68k ;;
 m88*)			gdb_host_cpu=m88k ;;
 mips*)			gdb_host_cpu=mips ;;
+microblaze*)		gdb_host_cpu=microblaze ;;
 powerpc* | rs6000)	gdb_host_cpu=powerpc ;;
 sparcv9 | sparc64)	gdb_host_cpu=sparc ;;
 s390*)			gdb_host_cpu=s390 ;;
@@ -133,6 +134,8 @@ mips*-*-netbsd* | mips*-*-knetbsd*-gnu)
 			gdb_host=nbsd ;;
 mips64*-*-openbsd*)	gdb_host=obsd64 ;;
 
+microblaze*-*linux*)    gdb_host=linux ;;
+
 powerpc-*-aix* | rs6000-*-* | powerpc64-*-aix*)
 			gdb_host=aix ;;
 powerpc*-*-freebsd*)	gdb_host=fbsd ;;
diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index 9297c56..3a7951a 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -343,6 +343,7 @@ microblaze*-linux-*|microblaze*-*-linux*)
 	gdb_target_obs="microblaze-tdep.o microblaze-linux-tdep.o microblaze-rom.o glibc-tdep.o \
 			monitor.o dsrec.o solib-svr4.o symfile-mem.o linux-tdep.o"
 	gdb_sim=../sim/microblaze/libsim.a
+	build_gdbserver=yes
 	;;
 microblaze*-*-*)
 	# Target: Xilinx MicroBlaze running standalone
diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index f773fa2..a11ace1 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -148,6 +148,7 @@ SFILES=	$(srcdir)/gdbreplay.c $(srcdir)/inferiors.c $(srcdir)/dll.c \
 	$(srcdir)/linux-ia64-low.c $(srcdir)/linux-low.c \
 	$(srcdir)/linux-m32r-low.c \
 	$(srcdir)/linux-m68k-low.c $(srcdir)/linux-mips-low.c \
+	$(srcdir)/linux-microblaze-low.c \
 	$(srcdir)/linux-nios2-low.c \
 	$(srcdir)/linux-ppc-low.c \
 	$(srcdir)/linux-s390-low.c \
@@ -329,6 +330,7 @@ clean:
 	rm -f arm-with-iwmmxt.c
 	rm -f arm-with-vfpv2.c arm-with-vfpv3.c arm-with-neon.c
 	rm -f mips-linux.c mips64-linux.c
+	rm -f microblaze-linux.c
 	rm -f nios2-linux.c
 	rm -f powerpc-32.c powerpc-32l.c powerpc-64l.c powerpc-e500l.c
 	rm -f powerpc-altivec32l.c powerpc-cell32l.c powerpc-vsx32l.c
@@ -612,6 +614,8 @@ reg-m68k.c : $(srcdir)/../regformats/reg-m68k.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-m68k.dat reg-m68k.c
 reg-cf.c : $(srcdir)/../regformats/reg-cf.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-cf.dat reg-cf.c
+microblaze-linux.c : $(srcdir)/../regformats/reg-microblaze.dat $(regdat_sh)
+	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/reg-microblaze.dat microblaze-linux.c
 mips-linux.c : $(srcdir)/../regformats/mips-linux.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/mips-linux.dat mips-linux.c
 mips-dsp-linux.c : $(srcdir)/../regformats/mips-dsp-linux.dat $(regdat_sh)
diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index cc4f53d..359c756 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -198,6 +198,12 @@ case "${target}" in
 			srv_linux_usrregs=yes
 			srv_linux_thread_db=yes
 			;;
+  microblaze*-*-linux*)	srv_regobj=microblaze-linux.o
+			srv_tgtobj="$srv_linux_obj linux-microblaze-low.o"
+			srv_linux_usrregs=yes
+			srv_linux_regsets=yes
+			srv_linux_thread_db=yes
+			;;
   nios2*-*-linux*)	srv_regobj="nios2-linux.o"
 			srv_tgtobj="$srv_linux_obj linux-nios2-low.o"
 			srv_xmlfiles="nios2-linux.xml"
diff --git a/gdb/gdbserver/linux-microblaze-low.c b/gdb/gdbserver/linux-microblaze-low.c
new file mode 100644
index 0000000..279df9f
--- /dev/null
+++ b/gdb/gdbserver/linux-microblaze-low.c
@@ -0,0 +1,228 @@
+/* GNU/Linux/Microblaze specific low level interface, for the remote server for
+   GDB.
+   Copyright (C) 1995-2013 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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#include "server.h"
+#include "linux-low.h"
+
+#include <asm/ptrace.h>
+#include <sys/procfs.h>
+#include <sys/ptrace.h>
+
+#include "gdb_proc_service.h"
+
+static int microblaze_regmap[] =
+ {PT_GPR(0),     PT_GPR(1),     PT_GPR(2),     PT_GPR(3),
+  PT_GPR(4),     PT_GPR(5),     PT_GPR(6),     PT_GPR(7),
+  PT_GPR(8),     PT_GPR(9),     PT_GPR(10),    PT_GPR(11),
+  PT_GPR(12),    PT_GPR(13),    PT_GPR(14),    PT_GPR(15),
+  PT_GPR(16),    PT_GPR(17),    PT_GPR(18),    PT_GPR(19),
+  PT_GPR(20),    PT_GPR(21),    PT_GPR(22),    PT_GPR(23),
+  PT_GPR(24),    PT_GPR(25),    PT_GPR(26),    PT_GPR(27),
+  PT_GPR(28),    PT_GPR(29),    PT_GPR(30),    PT_GPR(31),
+  PT_PC,         PT_MSR,        PT_EAR,        PT_ESR,
+  PT_FSR
+  };
+
+#define microblaze_num_regs (sizeof microblaze_regmap / sizeof microblaze_regmap[0])
+
+/* Defined in auto-generated file microblaze-linux.c.  */
+void init_registers_microblaze (void);
+extern const struct target_desc *tdesc_microblaze;
+
+static int
+microblaze_cannot_store_register (int regno)
+{
+  if (microblaze_regmap[regno] == -1 || regno == 0)
+    return 1;
+
+  return 0;
+}
+
+static int
+microblaze_cannot_fetch_register (int regno)
+{
+  return 0;
+}
+
+static CORE_ADDR
+microblaze_get_pc (struct regcache *regcache)
+{
+  unsigned long pc;
+
+  collect_register_by_name (regcache, "pc", &pc);
+  return (CORE_ADDR) pc;
+}
+
+static void
+microblaze_set_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+  unsigned long newpc = pc;
+
+  supply_register_by_name (regcache, "pc", &newpc);
+}
+
+/* dbtrap insn */
+/* brki r16, 0x18; */
+static const unsigned long microblaze_breakpoint = 0xba0c0018;
+#define microblaze_breakpoint_len 4
+
+static int
+microblaze_breakpoint_at (CORE_ADDR where)
+{
+  unsigned long insn;
+
+  (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
+  if (insn == microblaze_breakpoint)
+    return 1;
+  /* If necessary, recognize more trap instructions here.  GDB only uses the
+     one.  */
+  return 0;
+}
+
+static CORE_ADDR
+microblaze_reinsert_addr (struct regcache *regcache)
+{
+  unsigned long pc;
+  collect_register_by_name (regcache, "r15", &pc);
+  return pc;
+}
+
+#ifdef HAVE_PTRACE_GETREGS
+
+static void
+microblaze_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
+{
+  int size = register_size (regcache->tdesc, regno);
+
+  memset (buf, 0, sizeof (long));
+
+  if (size < sizeof (long))
+    collect_register (regcache, regno, buf + sizeof (long) - size);
+  else
+    collect_register (regcache, regno, buf);
+}
+
+static void
+microblaze_supply_ptrace_register (struct regcache *regcache,
+			    int regno, const char *buf)
+{
+  int size = register_size (regcache->tdesc, regno);
+
+  if (regno == 0) {
+    unsigned long regbuf_0 = 0;
+    /* clobbering r0 so that it is always 0 as enforced by hardware */
+    supply_register (regcache, regno, (const char*)&regbuf_0);
+  } else {
+      if (size < sizeof (long))
+        supply_register (regcache, regno, buf + sizeof (long) - size);
+      else
+        supply_register (regcache, regno, buf);
+  }
+}
+
+/* Provide only a fill function for the general register set.  ps_lgetregs
+   will use this for NPTL support.  */
+
+static void microblaze_fill_gregset (struct regcache *regcache, void *buf)
+{
+  int i;
+
+  for (i = 0; i < 32; i++)
+    microblaze_collect_ptrace_register (regcache, i, (char *) buf + microblaze_regmap[i]);
+}
+
+static void
+microblaze_store_gregset (struct regcache *regcache, const void *buf)
+{
+  int i;
+
+  for (i = 0; i < 32; i++)
+    supply_register (regcache, i, (char *) buf + microblaze_regmap[i]);
+}
+
+#endif /* HAVE_PTRACE_GETREGS */
+
+static struct regset_info microblaze_regsets[] = {
+#ifdef HAVE_PTRACE_GETREGS
+  { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), GENERAL_REGS, microblaze_fill_gregset, microblaze_store_gregset },
+  { 0, 0, 0, -1, -1, NULL, NULL },
+#endif /* HAVE_PTRACE_GETREGS */
+  { 0, 0, 0, -1, -1, NULL, NULL }
+};
+
+static struct regsets_info microblaze_regsets_info =
+  {
+    microblaze_regsets, /* regsets */
+    0, /* num_regsets */
+    NULL, /* disabled_regsets */
+  };
+
+static struct usrregs_info microblaze_usrregs_info =
+  {
+    microblaze_num_regs,
+    microblaze_regmap,
+  };
+
+static struct regs_info regs_info =
+  {
+    NULL, /* regset_bitmap */
+    &microblaze_usrregs_info,
+    &microblaze_regsets_info
+  };
+
+static const struct regs_info *
+microblaze_regs_info (void)
+{
+  return &regs_info;
+}
+
+static void
+microblaze_arch_setup (void)
+{
+  current_process ()->tdesc = tdesc_microblaze;
+}
+
+struct linux_target_ops the_low_target = {
+  microblaze_arch_setup,
+  microblaze_regs_info,
+  microblaze_cannot_fetch_register,
+  microblaze_cannot_store_register,
+  NULL, /* fetch_register */
+  microblaze_get_pc,
+  microblaze_set_pc,
+  (const unsigned char *) &microblaze_breakpoint,
+  microblaze_breakpoint_len,
+  microblaze_reinsert_addr,
+  0,
+  microblaze_breakpoint_at,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  microblaze_collect_ptrace_register,
+  microblaze_supply_ptrace_register,
+};
+
+void
+initialize_low_arch (void)
+{
+  init_registers_microblaze ();
+
+  initialize_regsets_info (&microblaze_regsets_info);
+}
\ No newline at end of file
diff --git a/gdb/microblaze-linux-tdep.c b/gdb/microblaze-linux-tdep.c
index 7e6b61b..cf58e21 100644
--- a/gdb/microblaze-linux-tdep.c
+++ b/gdb/microblaze-linux-tdep.c
@@ -38,6 +38,22 @@
 #include "tramp-frame.h"
 #include "linux-tdep.h"
 
+static int microblaze_debug_flag = 0;
+
+static void
+microblaze_debug (const char *fmt, ...)
+{
+  if (microblaze_debug_flag)
+    {
+       va_list args;
+
+       va_start (args, fmt);
+       printf_unfiltered ("MICROBLAZE LINUX: ");
+       vprintf_unfiltered (fmt, args);
+       va_end (args);
+    }
+}
+
 static int
 microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, 
 					   struct bp_target_info *bp_tgt)
@@ -47,20 +63,27 @@ microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch,
   int val;
   int bplen;
   gdb_byte old_contents[BREAKPOINT_MAX];
+  struct cleanup *cleanup;
 
   /* Determine appropriate breakpoint contents and size for this address.  */
   bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen);
   if (bp == NULL)
     error (_("Software breakpoints not implemented for this target."));
 
+  /* Make sure we see the memory breakpoints.  */
+  cleanup = make_show_memory_breakpoints_cleanup (1);
   val = target_read_memory (addr, old_contents, bplen);
 
   /* If our breakpoint is no longer at the address, this means that the
      program modified the code on us, so it is wrong to put back the
      old value.  */
   if (val == 0 && memcmp (bp, old_contents, bplen) == 0)
-    val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen);
+  {
+      val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen);
+      microblaze_debug ("microblaze_linux_memory_remove_breakpoint writing back to memory at addr 0x%lx\n", addr);
+  }
 
+  do_cleanups (cleanup);
   return val;
 }
 
diff --git a/gdb/microblaze-tdep.c b/gdb/microblaze-tdep.c
index 50b68d2..1c6dbfe 100644
--- a/gdb/microblaze-tdep.c
+++ b/gdb/microblaze-tdep.c
@@ -164,6 +164,39 @@ microblaze_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
   return sp;
 }
 
+static int
+microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch,
+				    struct bp_target_info *bp_tgt)
+{
+  CORE_ADDR addr = bp_tgt->placed_address;
+  const unsigned char *bp;
+  int val;
+  int bplen;
+  gdb_byte old_contents[BREAKPOINT_MAX];
+  struct cleanup *cleanup;
+
+  /* Determine appropriate breakpoint contents and size for this address.  */
+  bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen);
+  if (bp == NULL)
+    error (_("Software breakpoints not implemented for this target."));
+
+  /* Make sure we see the memory breakpoints.  */
+  cleanup = make_show_memory_breakpoints_cleanup (1);
+  val = target_read_memory (addr, old_contents, bplen);
+
+  /* If our breakpoint is no longer at the address, this means that the
+     program modified the code on us, so it is wrong to put back the
+     old value.  */
+  if (val == 0 && memcmp (bp, old_contents, bplen) == 0)
+  {
+    val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen);
+    microblaze_debug ("microblaze_linux_memory_remove_breakpoint writing back to memory at addr 0x%lx\n", addr);
+  }
+
+  do_cleanups (cleanup);
+  return val;
+}
+
 static const gdb_byte *
 microblaze_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pc, 
 			       int *len)
@@ -291,8 +324,8 @@ microblaze_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc,
 
   for (addr = func_addr; addr < stop; addr += INST_WORD_SIZE)
     {
-     //insn = microblaze_fetch_instruction (addr);
-      insn = insn_block[(addr - func_addr) / INST_WORD_SIZE];
+      insn = microblaze_fetch_instruction (addr);
+      //insn = insn_block[(addr - func_addr) / INST_WORD_SIZE];
       op = microblaze_decode_insn (insn, &rd, &ra, &rb, &imm);
       microblaze_debug ("%s %08lx op=%x r%d r%d imm=%d\n", paddress (gdbarch, addr), insn, op, rd, ra, imm);
 
@@ -724,13 +757,15 @@ microblaze_software_single_step (struct frame_info *frame)
 	  rb = get_frame_register_unsigned (frame, lrb);
 	else
 	  rb = 0;
+
 	stepbreaks[1].address = microblaze_get_target_address (insn, immfound, imm, pc, ra, rb, &targetvalid, &unconditionalbranch);
-        microblaze_debug ("single-step uncondbr=%d targetvalid=%d target=%x\n", unconditionalbranch, targetvalid, stepbreaks[1].address);
+	microblaze_debug ("single-step uncondbr=%d targetvalid=%d target=%x\n", unconditionalbranch, targetvalid, stepbreaks[1].address);
+
 	if (unconditionalbranch)
 	  stepbreaks[0].valid = FALSE; /* This is a unconditional branch: will not come to the next address */
 	if (targetvalid && (stepbreaks[0].valid == FALSE ||
 			    (stepbreaks[0].address != stepbreaks[1].address))
-	                && (stepbreaks[1].address != pc)) {
+			&& (stepbreaks[1].address != pc)) {
 	  stepbreaks[1].valid = TRUE;
 	} else {
 	  stepbreaks[1].valid = FALSE;
@@ -900,6 +935,8 @@ microblaze_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   /* Stack grows downward.  */
   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
 
+  set_gdbarch_memory_remove_breakpoint (gdbarch, microblaze_linux_memory_remove_breakpoint);
+
   set_gdbarch_breakpoint_from_pc (gdbarch, microblaze_breakpoint_from_pc);
   set_gdbarch_software_single_step (gdbarch, microblaze_software_single_step);
 
diff --git a/gdb/microblaze-tdep.h b/gdb/microblaze-tdep.h
index fec24b9..98aa0f5 100644
--- a/gdb/microblaze-tdep.h
+++ b/gdb/microblaze-tdep.h
@@ -129,7 +129,8 @@ enum microblaze_regnum
 
 /* MICROBLAZE_BREAKPOINT defines the breakpoint that should be used.
    Only used for native debugging.  */
-#define MICROBLAZE_BREAKPOINT {0xb9, 0xcc, 0x00, 0x60}
+#define MICROBLAZE_BREAKPOINT {0xba, 0x0c, 0x00, 0x18}
+#define MICROBLAZE_BREAKPOINT_LE {0x18, 0x00, 0x0c, 0xba}
 
 extern void microblaze_supply_gregset (const struct microblaze_gregset *gregset,
                                     struct regcache *regcache,
diff --git a/gdb/regformats/reg-microblaze.dat b/gdb/regformats/reg-microblaze.dat
new file mode 100644
index 0000000..a5dd0a0
--- /dev/null
+++ b/gdb/regformats/reg-microblaze.dat
@@ -0,0 +1,39 @@
+name:microblaze
+expedite:r1,pc
+32:r0
+32:r1
+32:r2
+32:r3
+32:r4
+32:r5
+32:r6
+32:r7
+32:r8
+32:r9
+32:r10
+32:r11
+32:r12
+32:r13
+32:r14
+32:r15
+32:r16
+32:r17
+32:r18
+32:r19
+32:r20
+32:r21
+32:r22
+32:r23
+32:r24
+32:r25
+32:r26
+32:r27
+32:r28
+32:r29
+32:r30
+32:r31
+32:pc
+32:msr
+32:ear
+32:esr
+32:fsr
-- 
1.9.0