Allow PPC users to select which PPC/RS6000 variant they're debugging

at run-time.  At the moment, the only thing this affects is the
set of registers visible.
* config/rs6000/tm-rs6000.h (REGISTER_NAME): Define this as a call
to the function rs6000_register_name.
(rs6000_register_name): Include extern decl.
(NUM_REGS): Bump to 183.  What's the right way to do this?
(FIRST_UISA_SP_REGNUM, LAST_UISA_SP_REGNUM): Renamed from
FIRST_SP_REGNUM, LAST_SP_REGNUM.
(REGISTER_BYTES): Recompute this.
* rs6000-tdep.c: Renamed all uses of FIRST_SP_REGNUM and
LAST_SP_REGNUM to FIRST_UISA_SP_REGNUM and LAST_UISA_SP_REGNUM, with
some concomitant formatting changes.
#include "gdbcmd.h", so we can define commands here.
(struct variant): New structure.
(COMMON_UISA_REG_NAMES, PPC_UISA_SPR_NAMES, PPC_SEGMENT_REG_NAMES,
PPC_32_OEA_SPR_NAMES, num_registers): New macros.
(register_names_rs6000, register_names_uisa, register_names_403,
register_names_403GC, register_names_505, register_names_860,
register_names_601, register_names_602, register_names_603,
register_names_604, register_names_750, variants): New variables.
(rs6000_register_name, install_variant, find_variant_by_name,
install_variant_by_name, list_variants, show_current_variant,
set_processor, show_processor): New functions.
(_initialize_rs6000_tdep): Define new commands `set processor' and
`show processor', and call install_variant_by_name to set the
default variant.
* rs6000-nat.c: Renamed all uses of FIRST_SP_REGNUM and
LAST_SP_REGNUM to FIRST_UISA_SP_REGNUM and LAST_UISA_SP_REGNUM, with
some concomitant formatting changes.
* configure.in: Accept the `--with-cpu' flag, to specify a default
processor variant.
* acconfig.h: Provide a blurb for TARGET_CPU_DEFAULT, which is set
by configure's `--with-cpu' flag.
* config.in, configure: Regenerated.

1 files changed, 381 insertions, 2 deletions

diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index d851c77..2323158 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -24,6 +24,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #include "symtab.h"
 #include "target.h"
 #include "gdbcore.h"
+#include "gdbcmd.h"
 #include "symfile.h"
 #include "objfiles.h"
 #include "xcoffsolib.h"
@@ -595,7 +596,7 @@ push_dummy_frame ()
   /* so far, 32*2 + 32 words = 384 bytes have been written. 
      7 extra registers in our register set: pc, ps, cnd, lr, cnt, xer, mq */
 
-  for (ii=1; ii <= (LAST_SP_REGNUM-FIRST_SP_REGNUM+1); ++ii) {
+  for (ii=1; ii <= (LAST_UISA_SP_REGNUM-FIRST_UISA_SP_REGNUM+1); ++ii) {
     write_memory (sp-384-(ii*4), 
 		  &registers[REGISTER_BYTE (FPLAST_REGNUM + ii)], 4);
   }
@@ -647,7 +648,7 @@ pop_dummy_frame ()
   }
 
   /* restore the rest of the registers. */
-  for (ii=1; ii <=(LAST_SP_REGNUM-FIRST_SP_REGNUM+1); ++ii)
+  for (ii=1; ii <=(LAST_UISA_SP_REGNUM-FIRST_UISA_SP_REGNUM+1); ++ii)
     read_memory (sp-384-(ii*4),
     		&registers[REGISTER_BYTE (FPLAST_REGNUM + ii)], 4);
 
@@ -1409,6 +1410,351 @@ get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
 #endif
 
 
+
+/* Handling the various PowerPC/RS6000 variants.  */
+
+
+/* The arrays here called register_names_MUMBLE hold names that 
+   the rs6000_register_name function returns.
+
+   For each family of PPC variants, I've tried to isolate out the
+   common registers and put them up front, so that as long as you get
+   the general family right, GDB will correctly identify the registers
+   common to that family.  The common register sets are:
+
+   For the 60x family: hid0 hid1 iabr dabr pir
+
+   For the 505 and 860 family: eie eid nri
+
+   For the 403 and 403GC: icdbdr esr dear evpr cdbcr tsr tcr pit tbhi
+	tblo srr2 srr3 dbsr dbcr iac1 iac2 dac1 dac2 dccr iccr pbl1
+	pbu1 pbl2 pbu2
+
+   Most of these register groups aren't anything formal.  I arrived at
+   them by looking at the registers that occurred in more than one
+   processor.  */
+
+/* UISA register names common across all architectures, including POWER.  */
+
+#define COMMON_UISA_REG_NAMES \
+  /*  0 */ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",  \
+  /*  8 */ "r8", "r9", "r10","r11","r12","r13","r14","r15", \
+  /* 16 */ "r16","r17","r18","r19","r20","r21","r22","r23", \
+  /* 24 */ "r24","r25","r26","r27","r28","r29","r30","r31", \
+  /* 32 */ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",  \
+  /* 40 */ "f8", "f9", "f10","f11","f12","f13","f14","f15", \
+  /* 48 */ "f16","f17","f18","f19","f20","f21","f22","f23", \
+  /* 56 */ "f24","f25","f26","f27","f28","f29","f30","f31", \
+  /* 64 */ "pc", "ps"
+
+/* UISA-level SPR names for PowerPC.  */
+#define PPC_UISA_SPR_NAMES \
+  /* 66 */ "cr",  "lr", "ctr", "xer", ""
+
+/* Segment register names, for PowerPC.  */
+#define PPC_SEGMENT_REG_NAMES \
+  /* 71 */ "sr0", "sr1", "sr2",  "sr3",  "sr4",  "sr5",  "sr6",  "sr7", \
+  /* 79 */ "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15"
+
+/* OEA SPR names for 32-bit PowerPC implementations.
+   The blank space is for "asr", which is only present on 64-bit
+   implementations.  */
+#define PPC_32_OEA_SPR_NAMES \
+  /*  87 */ "pvr", \
+  /*  88 */ "ibat0u", "ibat0l", "ibat1u", "ibat1l", \
+  /*  92 */ "ibat2u", "ibat2l", "ibat3u", "ibat3l", \
+  /*  96 */ "dbat0u", "dbat0l", "dbat1u", "dbat1l", \
+  /* 100 */ "dbat2u", "dbat2l", "dbat3u", "dbat3l", \
+  /* 104 */ "sdr1", "", "dar", "dsisr", "sprg0", "sprg1", "sprg2", "sprg3",\
+  /* 112 */ "srr0", "srr1", "tbl", "tbu", "dec", "dabr", "ear"
+
+/* For the RS6000, we only cover user-level SPR's.  */
+char *register_names_rs6000[] =
+{
+  COMMON_UISA_REG_NAMES,
+  /* 66 */ "cnd", "lr", "cnt", "xer", "mq"
+};
+
+/* a UISA-only view of the PowerPC.  */
+char *register_names_uisa[] =
+{
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES
+};
+
+char *register_names_403[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "icdbdr", "esr", "dear", "evpr", "cdbcr", "tsr", "tcr", "pit", 
+  /* 127 */ "tbhi", "tblo", "srr2", "srr3", "dbsr", "dbcr", "iac1", "iac2", 
+  /* 135 */ "dac1", "dac2", "dccr", "iccr", "pbl1", "pbu1", "pbl2", "pbu2"
+};
+
+char *register_names_403GC[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "icdbdr", "esr", "dear", "evpr", "cdbcr", "tsr", "tcr", "pit", 
+  /* 127 */ "tbhi", "tblo", "srr2", "srr3", "dbsr", "dbcr", "iac1", "iac2", 
+  /* 135 */ "dac1", "dac2", "dccr", "iccr", "pbl1", "pbu1", "pbl2", "pbu2", 
+  /* 143 */ "zpr", "pid", "sgr", "dcwr", "tbhu", "tblu"
+};
+
+char *register_names_505[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "eie", "eid", "nri"
+};
+
+char *register_names_860[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "eie", "eid", "nri", "cmpa", "cmpb", "cmpc", "cmpd", "icr", 
+  /* 127 */ "der", "counta", "countb", "cmpe", "cmpf", "cmpg", "cmph", 
+  /* 134 */ "lctrl1", "lctrl2", "ictrl", "bar", "ic_cst", "ic_adr", "ic_dat", 
+  /* 141 */ "dc_cst", "dc_adr", "dc_dat", "dpdr", "dpir", "immr", "mi_ctr", 
+  /* 148 */ "mi_ap", "mi_epn", "mi_twc", "mi_rpn", "md_ctr", "m_casid", 
+  /* 154 */ "md_ap", "md_epn", "md_twb", "md_twc", "md_rpn", "m_tw", 
+  /* 160 */ "mi_dbcam", "mi_dbram0", "mi_dbram1", "md_dbcam", "md_dbram0", 
+  /* 165 */ "md_dbram1"
+};
+
+/* Note that the 601 has different register numbers for reading and
+   writing RTCU and RTCL.  However, how one reads and writes a
+   register is the stub's problem.  */
+char *register_names_601[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "hid0", "hid1", "iabr", "dabr", "pir", "mq", "rtcu", 
+  /* 126 */ "rtcl"
+};
+
+char *register_names_602[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "hid0", "hid1", "iabr", "", "", "tcr", "ibr", "esassr", "sebr", 
+  /* 128 */ "ser", "sp", "lt"
+};
+
+char *register_names_603[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "hid0", "hid1", "iabr", "", "", "dmiss", "dcmp", "hash1", 
+  /* 127 */ "hash2", "imiss", "icmp", "rpa"
+};
+
+char *register_names_604[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "hid0", "hid1", "iabr", "dabr", "pir", "mmcr0", "pmc1", "pmc2", 
+  /* 127 */ "sia", "sda"
+};
+
+char *register_names_750[] =
+{ 
+  COMMON_UISA_REG_NAMES,
+  PPC_UISA_SPR_NAMES,
+  PPC_SEGMENT_REG_NAMES,
+  PPC_32_OEA_SPR_NAMES,
+  /* 119 */ "hid0", "hid1", "iabr", "dabr", "", "ummcr0", "upmc1", "upmc2", 
+  /* 127 */ "usia", "ummcr1", "upmc3", "upmc4", "mmcr0", "pmc1", "pmc2", 
+  /* 134 */ "sia", "mmcr1", "pmc3", "pmc4", "l2cr", "ictc", "thrm1", "thrm2", 
+  /* 142 */ "thrm3"
+};
+
+
+/* Information about a particular processor variant.  */
+struct variant
+{
+  /* Name of this variant.  */
+  char *name;
+
+  /* English description of the variant.  */
+  char *description;
+
+  /* Table of register names; registers[R] is the name of the register
+     number R.  */
+  int num_registers;
+  char **registers;
+};
+
+#define num_registers(list) (sizeof (list) / sizeof((list)[0]))
+
+
+/* Information in this table comes from the following web sites:
+   IBM:       http://www.chips.ibm.com:80/products/embedded/
+   Motorola:  http://www.mot.com/SPS/PowerPC/
+
+   I'm sure I've got some of the variant descriptions not quite right.
+   Please report any inaccuracies you find to GDB's maintainer.
+
+   If you add entries to this table, please be sure to allow the new
+   value as an argument to the --with-cpu flag, in configure.in.  */
+
+static struct variant
+variants[] =
+{
+  { "ppc-uisa", "PowerPC UISA - a PPC processor as viewed by user-level code",
+    num_registers (register_names_uisa),   register_names_uisa },
+  { "rs6000", "IBM RS6000 (\"POWER\") architecture, user-level view",
+    num_registers (register_names_rs6000), register_names_rs6000 },
+  { "403", "IBM PowerPC 403",
+    num_registers (register_names_403),   register_names_403 },
+  { "403GC", "IBM PowerPC 403GC",
+    num_registers (register_names_403GC), register_names_403GC },
+  { "505", "Motorola PowerPC 505",
+    num_registers (register_names_505),   register_names_505 },
+  { "860", "Motorola PowerPC 860 or 850",
+    num_registers (register_names_860),   register_names_860 },
+  { "601", "Motorola PowerPC 601",
+    num_registers (register_names_601),   register_names_601 },
+  { "602", "Motorola PowerPC 602",
+    num_registers (register_names_602),   register_names_602 },
+  { "603", "Motorola/IBM PowerPC 603 or 603e",
+    num_registers (register_names_603),   register_names_603 },
+  { "604", "Motorola PowerPC 604 or 604e",
+    num_registers (register_names_604),   register_names_604 },
+  { "750", "Motorola/IBM PowerPC 750 or 750",
+    num_registers (register_names_750),   register_names_750 },
+  { 0, 0, 0, 0 }
+};
+
+
+static struct variant *current_variant;
+
+char *
+rs6000_register_name (int i)
+{
+  if (i < 0 || i >= NUM_REGS)
+    error ("GDB bug: rs6000-tdep.c (rs6000_register_name): strange register number");
+
+  return ((i < current_variant->num_registers)
+	  ? current_variant->registers[i]
+	  : "");
+}
+
+
+static void
+install_variant (struct variant *v)
+{
+  current_variant = v;
+}
+
+
+/* Look up the variant named NAME in the `variants' table.  Return a
+   pointer to the struct variant, or null if we couldn't find it.  */
+static struct variant *
+find_variant_by_name (char *name)
+{
+  int i;
+  
+  for (i = 0; variants[i].name; i++)
+    if (! strcmp (name, variants[i].name))
+      return &variants[i];
+
+  return 0;
+}
+
+
+/* Install the PPC/RS6000 variant named NAME in the `variants' table.
+   Return zero if we installed it successfully, or a non-zero value if
+   we couldn't do it.
+
+   This might be useful to code outside this file, which doesn't want
+   to depend on the exact indices of the entries in the `variants'
+   table.  Just make it non-static if you want that.  */
+static int
+install_variant_by_name (char *name)
+{
+  struct variant *v = find_variant_by_name (name);
+
+  if (v)
+    {
+      install_variant (v);
+      return 0;
+    }
+  else
+    return 1;
+}
+
+
+static void
+list_variants ()
+{
+  int i;
+
+  printf_filtered ("GDB knows about the following PowerPC and RS6000 variants:\n");
+
+  for (i = 0; variants[i].name; i++)
+    printf_filtered ("  %-8s  %s\n",
+		     variants[i].name, variants[i].description);
+}
+
+
+static void
+show_current_variant ()
+{
+  printf_filtered ("PowerPC / RS6000 processor variant is set to `%s'.\n",
+		   current_variant->name);
+}
+
+
+static void
+set_processor (char *arg, int from_tty)
+{
+  int i;
+
+  if (! arg || arg[0] == '\0')
+    {
+      list_variants ();
+      return;
+    }
+
+  if (install_variant_by_name (arg))
+    {
+      error_begin ();
+      fprintf_filtered (gdb_stderr,
+			"`%s' is not a recognized PowerPC / RS6000 variant name.\n\n", arg);
+      list_variants ();
+      return_to_top_level (RETURN_ERROR);
+    }
+
+  show_current_variant ();
+}
+
+static void
+show_processor (char *arg, int from_tty)
+{
+  show_current_variant ();
+}
+
+
+
+/* Initialization code.  */
+
 void
 _initialize_rs6000_tdep ()
 {
@@ -1418,4 +1764,37 @@ _initialize_rs6000_tdep ()
 #else
   tm_print_insn = print_insn_rs6000;
 #endif
+
+  /* I don't think we should use the set/show command arrangement
+     here, because the way that's implemented makes it hard to do the
+     error checking we want in a reasonable way.  So we just add them
+     as two separate commands.  */
+  add_cmd ("processor", class_support, set_processor,
+	   "`set processor NAME' sets the PowerPC/RS6000 variant to NAME.\n\
+If you set this, GDB will know about the special-purpose registers that are\n\
+available on the given variant.\n\
+Type `set processor' alone for a list of recognized variant names.",
+	   &setlist);
+  add_cmd ("processor", class_support, show_processor,
+	   "Show the variant of the PowerPC or RS6000 processor in use.\n\
+Use `set processor' to change this.",
+	   &showlist);
+
+  /* Set the current PPC processor variant.  */
+  {
+    int status = 1;
+
+#ifdef TARGET_CPU_DEFAULT
+    status = install_variant_by_name (TARGET_CPU_DEFAULT);
+#endif
+
+    if (status)
+      {
+#ifdef GDB_TARGET_POWERPC
+	install_variant_by_name ("ppc-uisa");
+#else
+	install_variant_by_name ("rs6000");
+#endif
+      }
+  }
 }