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Re: [RFC] Add support for Morpho ms1 processor
- From: Kevin Buettner <kevinb at redhat dot com>
- To: gdb-patches at sources dot redhat dot com
- Date: Thu, 11 Aug 2005 16:53:33 -0700
- Subject: Re: [RFC] Add support for Morpho ms1 processor
- References: <20050603172038.449a41b9@ironwood.lan>
I'm reposting a revised version of the ms1-tdep.c portion of my earlier
patch (since that's where all that's where all the problems were).
Thanks to Daniel and Mark for their earlier comments. I believe I
have addressed all of the earlier concerns. (Except for adding an entry
to MAINTAINERS - I'll address that separately).
Further comments?
Kevin
* ms1-tdep.c: New file.
Index: ms1-tdep.c
===================================================================
RCS file: ms1-tdep.c
diff -N ms1-tdep.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ ms1-tdep.c 11 Aug 2005 23:50:21 -0000
@@ -0,0 +1,1055 @@
+/* Target-dependent code for Morpho ms1 processor, for GDB.
+
+ Copyright 2005 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. */
+
+/* Contributed by Michael Snyder, msnyder@redhat.com. */
+
+#include "defs.h"
+#include "frame.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "symtab.h"
+#include "dis-asm.h"
+#include "arch-utils.h"
+#include "gdbtypes.h"
+#include "gdb_string.h"
+#include "regcache.h"
+#include "reggroups.h"
+#include "gdbcore.h"
+#include "trad-frame.h"
+#include "inferior.h"
+#include "dwarf2-frame.h"
+#include "infcall.h"
+
+enum ms1_arch_constants
+{
+ MS1_MAX_STRUCT_SIZE = 16
+};
+
+enum ms1_gdb_regnums
+{
+ MS1_R0_REGNUM, /* 32 bit regs. */
+ MS1_R1_REGNUM,
+ MS1_1ST_ARGREG = MS1_R1_REGNUM,
+ MS1_R2_REGNUM,
+ MS1_R3_REGNUM,
+ MS1_R4_REGNUM,
+ MS1_LAST_ARGREG = MS1_R4_REGNUM,
+ MS1_R5_REGNUM,
+ MS1_R6_REGNUM,
+ MS1_R7_REGNUM,
+ MS1_R8_REGNUM,
+ MS1_R9_REGNUM,
+ MS1_R10_REGNUM,
+ MS1_R11_REGNUM,
+ MS1_R12_REGNUM,
+ MS1_FP_REGNUM = MS1_R12_REGNUM,
+ MS1_R13_REGNUM,
+ MS1_SP_REGNUM = MS1_R13_REGNUM,
+ MS1_R14_REGNUM,
+ MS1_RA_REGNUM = MS1_R14_REGNUM,
+ MS1_R15_REGNUM,
+ MS1_IRA_REGNUM = MS1_R15_REGNUM,
+ MS1_PC_REGNUM,
+
+ /* Interrupt Enable pseudo-register, exported by SID. */
+ MS1_INT_ENABLE_REGNUM,
+ /* End of CPU regs. */
+
+ MS1_NUM_CPU_REGS,
+
+ /* Co-processor registers. */
+ MS1_COPRO_REGNUM = MS1_NUM_CPU_REGS, /* 16 bit regs. */
+ MS1_CPR0_REGNUM,
+ MS1_CPR1_REGNUM,
+ MS1_CPR2_REGNUM,
+ MS1_CPR3_REGNUM,
+ MS1_CPR4_REGNUM,
+ MS1_CPR5_REGNUM,
+ MS1_CPR6_REGNUM,
+ MS1_CPR7_REGNUM,
+ MS1_CPR8_REGNUM,
+ MS1_CPR9_REGNUM,
+ MS1_CPR10_REGNUM,
+ MS1_CPR11_REGNUM,
+ MS1_CPR12_REGNUM,
+ MS1_CPR13_REGNUM,
+ MS1_CPR14_REGNUM,
+ MS1_CPR15_REGNUM,
+ MS1_BYPA_REGNUM, /* 32 bit regs. */
+ MS1_BYPB_REGNUM,
+ MS1_BYPC_REGNUM,
+ MS1_FLAG_REGNUM,
+ MS1_CONTEXT_REGNUM, /* 38 bits (treat as array of
+ six bytes). */
+ MS1_MAC_REGNUM, /* 32 bits. */
+ MS1_Z1_REGNUM, /* 16 bits. */
+ MS1_Z2_REGNUM, /* 16 bits. */
+ MS1_ICHANNEL_REGNUM, /* 32 bits. */
+ MS1_ISCRAMB_REGNUM, /* 32 bits. */
+ MS1_QSCRAMB_REGNUM, /* 32 bits. */
+ MS1_OUT_REGNUM, /* 16 bits. */
+ MS1_EXMAC_REGNUM, /* 32 bits (8 used). */
+ MS1_QCHANNEL_REGNUM, /* 32 bits. */
+
+ /* Number of real registers. */
+ MS1_NUM_REGS,
+
+ /* Pseudo-registers. */
+ MS1_COPRO_PSEUDOREG_REGNUM = MS1_NUM_REGS,
+ MS1_MAC_PSEUDOREG_REGNUM,
+
+ /* Two pseudo-regs ('coprocessor' and 'mac'). */
+ MS1_NUM_PSEUDO_REGS = 2
+};
+
+/* Return name of register number specified by REGNUM. */
+
+static const char *
+ms1_register_name (int regnum)
+{
+ static char *register_names[] = {
+ /* CPU regs. */
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ "pc", "IE",
+ /* Co-processor regs. */
+ "", /* copro register. */
+ "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
+ "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
+ "bypa", "bypb", "bypc", "flag", "context", "" /* mac. */ , "z1", "z2",
+ "Ichannel", "Iscramb", "Qscramb", "out", "" /* ex-mac. */ , "Qchannel",
+ /* Pseudo-registers. */
+ "coprocessor", "MAC"
+ };
+
+ if (regnum >= 0 &&
+ regnum < sizeof (register_names) / sizeof (register_names[0]))
+ {
+ return register_names[regnum];
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("ms1_register_name: illegal register number %d"), regnum);
+}
+
+/* Given ARCH and a register number specified by REGNUM, return the
+ type of that register. */
+
+static struct type *
+ms1_register_type (struct gdbarch *arch, int regnum)
+{
+ static struct type *void_func_ptr = NULL;
+ static struct type *void_ptr = NULL;
+ static struct type *copro_type;
+
+ if (regnum >= 0 && regnum < MS1_NUM_REGS + MS1_NUM_PSEUDO_REGS)
+ {
+ if (void_func_ptr == NULL)
+ {
+ struct type *temp;
+
+ void_ptr = lookup_pointer_type (builtin_type_void);
+ void_func_ptr =
+ lookup_pointer_type (lookup_function_type (builtin_type_void));
+ temp = create_range_type (NULL, builtin_type_unsigned_int, 0, 1);
+ copro_type = create_array_type (NULL, builtin_type_int16, temp);
+ }
+ switch (regnum)
+ {
+ case MS1_PC_REGNUM:
+ case MS1_RA_REGNUM:
+ case MS1_IRA_REGNUM:
+ return void_func_ptr;
+ case MS1_SP_REGNUM:
+ case MS1_FP_REGNUM:
+ return void_ptr;
+ case MS1_INT_ENABLE_REGNUM:
+ case MS1_ICHANNEL_REGNUM:
+ case MS1_QCHANNEL_REGNUM:
+ case MS1_ISCRAMB_REGNUM:
+ case MS1_QSCRAMB_REGNUM:
+ return builtin_type_int32;
+ case MS1_EXMAC_REGNUM:
+ case MS1_MAC_REGNUM:
+ return builtin_type_uint32;
+ case MS1_BYPA_REGNUM:
+ case MS1_BYPB_REGNUM:
+ case MS1_BYPC_REGNUM:
+ case MS1_Z1_REGNUM:
+ case MS1_Z2_REGNUM:
+ case MS1_OUT_REGNUM:
+ return builtin_type_int16;
+ case MS1_CONTEXT_REGNUM:
+ return builtin_type_long_long;
+ case MS1_COPRO_REGNUM:
+ case MS1_COPRO_PSEUDOREG_REGNUM:
+ return copro_type;
+ case MS1_MAC_PSEUDOREG_REGNUM:
+ if (gdbarch_bfd_arch_info (arch)->mach == bfd_mach_mrisc2)
+ return builtin_type_uint64;
+ else
+ return builtin_type_uint32;
+ case MS1_FLAG_REGNUM:
+ return builtin_type_unsigned_char;
+ default:
+ if (regnum >= MS1_R0_REGNUM && regnum <= MS1_R15_REGNUM)
+ return builtin_type_int32;
+ else if (regnum >= MS1_CPR0_REGNUM && regnum <= MS1_CPR15_REGNUM)
+ return builtin_type_int16;
+ }
+ }
+ internal_error (__FILE__, __LINE__,
+ _("ms1_register_type: illegal register number %d"), regnum);
+}
+
+/* Return true if register REGNUM is a member of the register group
+ specified by GROUP. */
+
+static int
+ms1_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
+{
+ /* Groups of registers that can be displayed via "info reg". */
+ if (group == all_reggroup)
+ return (regnum >= 0
+ && regnum < MS1_NUM_REGS + MS1_NUM_PSEUDO_REGS
+ && ms1_register_name (regnum)[0] != '\0');
+
+ if (group == general_reggroup)
+ return (regnum >= MS1_R0_REGNUM && regnum <= MS1_R15_REGNUM);
+
+ if (group == float_reggroup)
+ return 0; /* No float regs. */
+
+ if (group == vector_reggroup)
+ return 0; /* No vector regs. */
+
+ /* For any that are not handled above. */
+ return default_register_reggroup_p (gdbarch, regnum, group);
+}
+
+/* Return the return value convention used for a given type TYPE.
+ Optionally, fetch or set the return value via READBUF or
+ WRITEBUF respectively using REGCACHE for the register
+ values. */
+
+static enum return_value_convention
+ms1_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, gdb_byte *readbuf,
+ const gdb_byte *writebuf)
+{
+ if (TYPE_LENGTH (type) > 4)
+ {
+ /* Return values > 4 bytes are returned in memory,
+ pointed to by R11. */
+ if (readbuf)
+ {
+ ULONGEST addr;
+
+ regcache_cooked_read_unsigned (regcache, MS1_R11_REGNUM, &addr);
+ read_memory (addr, readbuf, TYPE_LENGTH (type));
+ }
+
+ if (writebuf)
+ {
+ ULONGEST addr;
+
+ regcache_cooked_read_unsigned (regcache, MS1_R11_REGNUM, &addr);
+ write_memory (addr, writebuf, TYPE_LENGTH (type));
+ }
+
+ return RETURN_VALUE_ABI_RETURNS_ADDRESS;
+ }
+ else
+ {
+ if (readbuf)
+ {
+ ULONGEST temp;
+
+ /* Return values of <= 4 bytes are returned in R11. */
+ regcache_cooked_read_unsigned (regcache, MS1_R11_REGNUM, &temp);
+ store_unsigned_integer (readbuf, TYPE_LENGTH (type), temp);
+ }
+
+ if (writebuf)
+ {
+ if (TYPE_LENGTH (type) < 4)
+ {
+ gdb_byte buf[4];
+ /* Add leading zeros to the value. */
+ memset (buf, 0, sizeof (buf));
+ memcpy (buf + sizeof (buf) - TYPE_LENGTH (type),
+ writebuf, TYPE_LENGTH (type));
+ regcache_cooked_write (regcache, MS1_R11_REGNUM, buf);
+ }
+ else /* (TYPE_LENGTH (type) == 4 */
+ regcache_cooked_write (regcache, MS1_R11_REGNUM, writebuf);
+ }
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+}
+
+/* If the input address, PC, is in a function prologue, return the
+ address of the end of the prologue, otherwise return the input
+ address.
+
+ Note: PC is likely to be the function start, since this function
+ is mainly used for advancing a breakpoint to the first line, or
+ stepping to the first line when we have stepped into a function
+ call. */
+
+static CORE_ADDR
+ms1_skip_prologue (CORE_ADDR pc)
+{
+ CORE_ADDR func_addr = 0, func_end = 0;
+ char *func_name;
+ unsigned long instr;
+
+ if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end))
+ {
+ struct symtab_and_line sal;
+ struct symbol *sym;
+
+ /* Found a function. */
+ sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL, NULL);
+ if (sym && SYMBOL_LANGUAGE (sym) != language_asm)
+ {
+ /* Don't use this trick for assembly source files. */
+ sal = find_pc_line (func_addr, 0);
+
+ if (sal.end && sal.end < func_end)
+ {
+ /* Found a line number, use it as end of prologue. */
+ return sal.end;
+ }
+ }
+ }
+
+ /* No function symbol, or no line symbol. Use prologue scanning method. */
+ for (;; pc += 4)
+ {
+ instr = read_memory_unsigned_integer (pc, 4);
+ if (instr == 0x12000000) /* nop */
+ continue;
+ if (instr == 0x12ddc000) /* copy sp into fp */
+ continue;
+ instr >>= 16;
+ if (instr == 0x05dd) /* subi sp, sp, imm */
+ continue;
+ if (instr >= 0x43c0 && instr <= 0x43df) /* push */
+ continue;
+ /* Not an obvious prologue instruction. */
+ break;
+ }
+
+ return pc;
+}
+
+/* The breakpoint instruction must be the same size as the smallest
+ instruction in the instruction set.
+
+ The BP for ms1 is defined as 0x68000000. */
+
+static const unsigned char *
+ms1_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
+{
+ static char breakpoint[] = { 0x68, 0, 0, 0 };
+
+ *bp_size = 4;
+ return breakpoint;
+}
+
+/* Fetch the pseudo registers:
+
+ There are two pseudo-registers:
+ 1) The 'coprocessor' pseudo-register (which mirrors the
+ "real" coprocessor register sent by the target), and
+ 2) The 'MAC' pseudo-register (which represents the union
+ of the original 32 bit target MAC register and the new
+ 8-bit extended-MAC register). */
+
+static void
+ms1_pseudo_register_read (struct gdbarch *gdbarch,
+ struct regcache *regcache, int regno, gdb_byte *buf)
+{
+ switch (regno)
+ {
+ case MS1_COPRO_REGNUM:
+ case MS1_COPRO_PSEUDOREG_REGNUM:
+ regcache_raw_read (regcache, MS1_COPRO_REGNUM, buf);
+ break;
+ case MS1_MAC_REGNUM:
+ case MS1_MAC_PSEUDOREG_REGNUM:
+ if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2)
+ {
+ ULONGEST oldmac = 0, ext_mac = 0;
+ ULONGEST newmac;
+
+ regcache_cooked_read_unsigned (regcache, MS1_MAC_REGNUM, &oldmac);
+ regcache_cooked_read_unsigned (regcache, MS1_EXMAC_REGNUM, &ext_mac);
+ newmac =
+ (oldmac & 0xffffffff) | ((long long) (ext_mac & 0xff) << 32);
+ store_signed_integer (buf, 8, newmac);
+ }
+ else
+ regcache_raw_read (regcache, MS1_MAC_REGNUM, buf);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("ms1_pseudo_register_read: bad reg # (%d)"), regno);
+ break;
+ }
+}
+
+/* Write the pseudo registers:
+
+ Ms1 pseudo-registers are stored directly to the target. The
+ 'coprocessor' register is special, because when it is modified, all
+ the other coprocessor regs must be flushed from the reg cache. */
+
+static void
+ms1_pseudo_register_write (struct gdbarch *gdbarch,
+ struct regcache *regcache,
+ int regno, const gdb_byte *buf)
+{
+ int i;
+
+ switch (regno)
+ {
+ case MS1_COPRO_REGNUM:
+ case MS1_COPRO_PSEUDOREG_REGNUM:
+ regcache_raw_write (regcache, MS1_COPRO_REGNUM, buf);
+ for (i = MS1_NUM_CPU_REGS; i < MS1_NUM_REGS; i++)
+ set_register_cached (i, 0);
+ break;
+ case MS1_MAC_REGNUM:
+ case MS1_MAC_PSEUDOREG_REGNUM:
+ if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2)
+ {
+ /* The 8-byte MAC pseudo-register must be broken down into two
+ 32-byte registers. */
+ unsigned int oldmac, ext_mac;
+ ULONGEST newmac;
+
+ newmac = extract_unsigned_integer (buf, 8);
+ oldmac = newmac & 0xffffffff;
+ ext_mac = (newmac >> 32) & 0xff;
+ regcache_cooked_write_unsigned (regcache, MS1_MAC_REGNUM, oldmac);
+ regcache_cooked_write_unsigned (regcache, MS1_EXMAC_REGNUM, ext_mac);
+ }
+ else
+ regcache_raw_write (regcache, MS1_MAC_REGNUM, buf);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("ms1_pseudo_register_write: bad reg # (%d)"), regno);
+ break;
+ }
+}
+
+static CORE_ADDR
+ms1_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
+{
+ /* Register size is 4 bytes. */
+ return align_down (sp, 4);
+}
+
+/* Implements the "info registers" command. When ``all'' is non-zero,
+ the coprocessor registers will be printed in addition to the rest
+ of the registers. */
+
+static void
+ms1_registers_info (struct gdbarch *gdbarch,
+ struct ui_file *file,
+ struct frame_info *frame, int regnum, int all)
+{
+ if (regnum == -1)
+ {
+ int lim;
+
+ lim = all ? MS1_NUM_REGS : MS1_NUM_CPU_REGS;
+
+ for (regnum = 0; regnum < lim; regnum++)
+ {
+ /* Don't display the Qchannel register since it will be displayed
+ along with Ichannel. (See below.) */
+ if (regnum == MS1_QCHANNEL_REGNUM)
+ continue;
+
+ ms1_registers_info (gdbarch, file, frame, regnum, all);
+
+ /* Display the Qchannel register immediately after Ichannel. */
+ if (regnum == MS1_ICHANNEL_REGNUM)
+ ms1_registers_info (gdbarch, file, frame, MS1_QCHANNEL_REGNUM, all);
+ }
+ }
+ else
+ {
+ if (regnum == MS1_EXMAC_REGNUM)
+ return;
+ else if (regnum == MS1_CONTEXT_REGNUM)
+ {
+ /* Special output handling for 38-bit context register. */
+ unsigned char *buff;
+ unsigned int *bytes, i, regsize;
+
+ regsize = register_size (gdbarch, regnum);
+
+ buff = alloca (regsize);
+ bytes = alloca (regsize * sizeof (*bytes));
+
+ frame_register_read (frame, regnum, buff);
+
+ fputs_filtered (REGISTER_NAME (regnum), file);
+ print_spaces_filtered (15 - strlen (REGISTER_NAME (regnum)), file);
+ fputs_filtered ("0x", file);
+
+ for (i = 0; i < regsize; i++)
+ fprintf_filtered (file, "%02x", (unsigned int)
+ extract_unsigned_integer (buff + i, 1));
+ fputs_filtered ("\t", file);
+ print_longest (file, 'd', 0,
+ extract_unsigned_integer (buff, regsize));
+ fputs_filtered ("\n", file);
+ }
+ else if (regnum == MS1_COPRO_REGNUM
+ || regnum == MS1_COPRO_PSEUDOREG_REGNUM)
+ {
+ /* Special output handling for the 'coprocessor' register. */
+ char *buf;
+
+ buf = alloca (register_size (gdbarch, MS1_COPRO_REGNUM));
+ frame_register_read (frame, MS1_COPRO_REGNUM, buf);
+ /* And print. */
+ regnum = MS1_COPRO_PSEUDOREG_REGNUM;
+ fputs_filtered (REGISTER_NAME (regnum), file);
+ print_spaces_filtered (15 - strlen (REGISTER_NAME (regnum)), file);
+ val_print (register_type (gdbarch, regnum), buf,
+ 0, 0, file, 0, 1, 0, Val_no_prettyprint);
+ fputs_filtered ("\n", file);
+ }
+ else if (regnum == MS1_MAC_REGNUM || regnum == MS1_MAC_PSEUDOREG_REGNUM)
+ {
+ ULONGEST oldmac, ext_mac, newmac;
+ char buf[3 * sizeof (LONGEST)];
+
+ /* Get the two "real" mac registers. */
+ frame_register_read (frame, MS1_MAC_REGNUM, buf);
+ oldmac = extract_unsigned_integer (buf,
+ register_size (gdbarch,
+ MS1_MAC_REGNUM));
+ if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2)
+ {
+ frame_register_read (frame, MS1_EXMAC_REGNUM, buf);
+ ext_mac = extract_unsigned_integer (buf,
+ register_size (gdbarch,
+ MS1_EXMAC_REGNUM));
+ }
+ else
+ ext_mac = 0;
+
+ /* Add them together. */
+ newmac = (oldmac & 0xffffffff) + ((ext_mac & 0xff) << 32);
+
+ /* And print. */
+ regnum = MS1_MAC_PSEUDOREG_REGNUM;
+ fputs_filtered (REGISTER_NAME (regnum), file);
+ print_spaces_filtered (15 - strlen (REGISTER_NAME (regnum)), file);
+ fputs_filtered ("0x", file);
+ print_longest (file, 'x', 0, newmac);
+ fputs_filtered ("\t", file);
+ print_longest (file, 'u', 0, newmac);
+ fputs_filtered ("\n", file);
+ }
+ else
+ default_print_registers_info (gdbarch, file, frame, regnum, all);
+ }
+}
+
+/* Set up the callee's arguments for an inferior function call. The
+ arguments are pushed on the stack or are placed in registers as
+ appropriate. It also sets up the return address (which points to
+ the call dummy breakpoint).
+
+ Returns the updated (and aligned) stack pointer. */
+
+static CORE_ADDR
+ms1_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
+{
+#define wordsize 4
+ char buf[MS1_MAX_STRUCT_SIZE];
+ int argreg = MS1_1ST_ARGREG;
+ int split_param_len = 0;
+ int stack_dest = sp;
+ int slacklen;
+ int typelen;
+ int i, j;
+
+ /* First handle however many args we can fit into MS1_1ST_ARGREG thru
+ MS1_LAST_ARGREG. */
+ for (i = 0; i < nargs && argreg <= MS1_LAST_ARGREG; i++)
+ {
+ const char *val;
+ typelen = TYPE_LENGTH (value_type (args[i]));
+ switch (typelen)
+ {
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ regcache_cooked_write_unsigned (regcache, argreg++,
+ extract_unsigned_integer
+ (value_contents (args[i]),
+ wordsize));
+ break;
+ case 8:
+ case 12:
+ case 16:
+ val = value_contents (args[i]);
+ while (typelen > 0)
+ {
+ if (argreg <= MS1_LAST_ARGREG)
+ {
+ /* This word of the argument is passed in a register. */
+ regcache_cooked_write_unsigned (regcache, argreg++,
+ extract_unsigned_integer
+ (val, wordsize));
+ typelen -= wordsize;
+ val += wordsize;
+ }
+ else
+ {
+ /* Remainder of this arg must be passed on the stack
+ (deferred to do later). */
+ split_param_len = typelen;
+ memcpy (buf, val, typelen);
+ break; /* No more args can be handled in regs. */
+ }
+ }
+ break;
+ default:
+ /* By reverse engineering of gcc output, args bigger than
+ 16 bytes go on the stack, and their address is passed
+ in the argreg. */
+ stack_dest -= typelen;
+ write_memory (stack_dest, value_contents (args[i]), typelen);
+ regcache_cooked_write_unsigned (regcache, argreg++, stack_dest);
+ break;
+ }
+ }
+
+ /* Next, the rest of the arguments go onto the stack, in reverse order. */
+ for (j = nargs - 1; j >= i; j--)
+ {
+ char *val;
+ /* Right-justify the value in an aligned-length buffer. */
+ typelen = TYPE_LENGTH (value_type (args[j]));
+ slacklen = (wordsize - (typelen % wordsize)) % wordsize;
+ val = alloca (typelen + slacklen);
+ memcpy (val, value_contents (args[j]), typelen);
+ memset (val + typelen, 0, slacklen);
+ /* Now write this data to the stack. */
+ stack_dest -= typelen + slacklen;
+ write_memory (stack_dest, val, typelen + slacklen);
+ }
+
+ /* Finally, if a param needs to be split between registers and stack,
+ write the second half to the stack now. */
+ if (split_param_len != 0)
+ {
+ stack_dest -= split_param_len;
+ write_memory (stack_dest, buf, split_param_len);
+ }
+
+ /* Set up return address (provided to us as bp_addr). */
+ regcache_cooked_write_unsigned (regcache, MS1_RA_REGNUM, bp_addr);
+
+ /* Store struct return address, if given. */
+ if (struct_return && struct_addr != 0)
+ regcache_cooked_write_unsigned (regcache, MS1_R11_REGNUM, struct_addr);
+
+ /* Set aside 16 bytes for the callee to save regs 1-4. */
+ stack_dest -= 16;
+
+ /* Update the stack pointer. */
+ regcache_cooked_write_unsigned (regcache, MS1_SP_REGNUM, stack_dest);
+
+ /* And that should do it. Return the new stack pointer. */
+ return stack_dest;
+}
+
+
+/* The 'unwind_cache' data structure. */
+
+struct ms1_unwind_cache
+{
+ /* The previous frame's inner most stack address.
+ Used as this frame ID's stack_addr. */
+ CORE_ADDR prev_sp;
+ CORE_ADDR frame_base;
+ int framesize;
+ int frameless_p;
+
+ /* Table indicating the location of each and every register. */
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+/* Initialize an unwind_cache. Build up the saved_regs table etc. for
+ the frame. */
+
+static struct ms1_unwind_cache *
+ms1_frame_unwind_cache (struct frame_info *next_frame,
+ void **this_prologue_cache)
+{
+ struct gdbarch *gdbarch;
+ struct ms1_unwind_cache *info;
+ CORE_ADDR next_addr, start_addr, end_addr, prologue_end_addr;
+ unsigned long instr, upper_half, delayed_store = 0;
+ int regnum, offset;
+ ULONGEST sp, fp;
+
+ if ((*this_prologue_cache))
+ return (*this_prologue_cache);
+
+ gdbarch = get_frame_arch (next_frame);
+ info = FRAME_OBSTACK_ZALLOC (struct ms1_unwind_cache);
+ (*this_prologue_cache) = info;
+
+ info->prev_sp = 0;
+ info->framesize = 0;
+ info->frame_base = 0;
+ info->frameless_p = 1;
+ info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+ /* Grab the frame-relative values of SP and FP, needed below.
+ The frame_saved_register function will find them on the
+ stack or in the registers as appropriate. */
+ frame_unwind_unsigned_register (next_frame, MS1_SP_REGNUM, &sp);
+ frame_unwind_unsigned_register (next_frame, MS1_FP_REGNUM, &fp);
+
+ start_addr = frame_func_unwind (next_frame);
+
+ /* Return early if GDB couldn't find the function. */
+ if (start_addr == 0)
+ return info;
+
+ end_addr = frame_pc_unwind (next_frame);
+ prologue_end_addr = skip_prologue_using_sal (start_addr);
+ if (end_addr == 0)
+ for (next_addr = start_addr; next_addr < end_addr; next_addr += 4)
+ {
+ instr = get_frame_memory_unsigned (next_frame, next_addr, 4);
+ if (delayed_store) /* previous instr was a push */
+ {
+ upper_half = delayed_store >> 16;
+ regnum = upper_half & 0xf;
+ offset = delayed_store & 0xffff;
+ switch (upper_half & 0xfff0)
+ {
+ case 0x43c0: /* push using frame pointer */
+ info->saved_regs[regnum].addr = offset;
+ break;
+ case 0x43d0: /* push using stack pointer */
+ info->saved_regs[regnum].addr = offset;
+ break;
+ default: /* lint */
+ break;
+ }
+ delayed_store = 0;
+ }
+
+ switch (instr)
+ {
+ case 0x12000000: /* NO-OP */
+ continue;
+ case 0x12ddc000: /* copy sp into fp */
+ info->frameless_p = 0; /* Record that the frame pointer is in use. */
+ continue;
+ default:
+ upper_half = instr >> 16;
+ if (upper_half == 0x05dd || /* subi sp, sp, imm */
+ upper_half == 0x07dd) /* subui sp, sp, imm */
+ {
+ /* Record the frame size. */
+ info->framesize = instr & 0xffff;
+ continue;
+ }
+ if ((upper_half & 0xfff0) == 0x43c0 || /* frame push */
+ (upper_half & 0xfff0) == 0x43d0) /* stack push */
+ {
+ /* Save this instruction, but don't record the
+ pushed register as 'saved' until we see the
+ next instruction. That's because of deferred stores
+ on this target -- GDB won't be able to read the register
+ from the stack until one instruction later. */
+ delayed_store = instr;
+ continue;
+ }
+ /* Not a prologue instruction. Is this the end of the prologue?
+ This is the most difficult decision; when to stop scanning.
+
+ If we have no line symbol, then the best thing we can do
+ is to stop scanning when we encounter an instruction that
+ is not likely to be a part of the prologue.
+
+ But if we do have a line symbol, then we should
+ keep scanning until we reach it (or we reach end_addr). */
+
+ if (prologue_end_addr && (prologue_end_addr > (next_addr + 4)))
+ continue; /* Keep scanning, recording saved_regs etc. */
+ else
+ break; /* Quit scanning: breakpoint can be set here. */
+ }
+ }
+
+ /* Special handling for the "saved" address of the SP:
+ The SP is of course never saved on the stack at all, so
+ by convention what we put here is simply the previous
+ _value_ of the SP (as opposed to an address where the
+ previous value would have been pushed). This will also
+ give us the frame base address. */
+
+ if (info->frameless_p)
+ {
+ info->frame_base = sp + info->framesize;
+ info->prev_sp = sp + info->framesize;
+ }
+ else
+ {
+ info->frame_base = fp + info->framesize;
+ info->prev_sp = fp + info->framesize;
+ }
+ /* Save prev_sp in saved_regs as a value, not as an address. */
+ trad_frame_set_value (info->saved_regs, MS1_SP_REGNUM, info->prev_sp);
+
+ /* Now convert frame offsets to actual addresses (not offsets). */
+ for (regnum = 0; regnum < MS1_NUM_REGS; regnum++)
+ if (trad_frame_addr_p (info->saved_regs, regnum))
+ info->saved_regs[regnum].addr += info->frame_base - info->framesize;
+
+ /* The call instruction moves the caller's PC in the callee's RA reg.
+ Since this is an unwind, do the reverse. Copy the location of RA
+ into PC (the address / regnum) so that a request for PC will be
+ converted into a request for the RA. */
+ info->saved_regs[MS1_PC_REGNUM] = info->saved_regs[MS1_RA_REGNUM];
+
+ return info;
+}
+
+static CORE_ADDR
+ms1_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ ULONGEST pc;
+
+ frame_unwind_unsigned_register (next_frame, MS1_PC_REGNUM, &pc);
+ return pc;
+}
+
+static CORE_ADDR
+ms1_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ ULONGEST sp;
+
+ frame_unwind_unsigned_register (next_frame, MS1_SP_REGNUM, &sp);
+ return sp;
+}
+
+/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
+ dummy frame. The frame ID's base needs to match the TOS value
+ saved by save_dummy_frame_tos(), and the PC match the dummy frame's
+ breakpoint. */
+
+static struct frame_id
+ms1_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ return frame_id_build (ms1_unwind_sp (gdbarch, next_frame),
+ frame_pc_unwind (next_frame));
+}
+
+/* Given a GDB frame, determine the address of the calling function's
+ frame. This will be used to create a new GDB frame struct. */
+
+static void
+ms1_frame_this_id (struct frame_info *next_frame,
+ void **this_prologue_cache, struct frame_id *this_id)
+{
+ struct ms1_unwind_cache *info =
+ ms1_frame_unwind_cache (next_frame, this_prologue_cache);
+
+ if (!(info == NULL || info->prev_sp == 0))
+ {
+ (*this_id) = frame_id_build (info->prev_sp,
+ frame_func_unwind (next_frame));
+ }
+ return;
+}
+
+static void
+ms1_frame_prev_register (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, gdb_byte *bufferp)
+{
+ struct ms1_unwind_cache *info =
+ ms1_frame_unwind_cache (next_frame, this_prologue_cache);
+
+ trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, bufferp);
+}
+
+static CORE_ADDR
+ms1_frame_base_address (struct frame_info *next_frame,
+ void **this_prologue_cache)
+{
+ struct ms1_unwind_cache *info =
+ ms1_frame_unwind_cache (next_frame, this_prologue_cache);
+
+ return info->frame_base;
+}
+
+/* This is a shared interface: the 'frame_unwind' object is what's
+ returned by the 'sniffer' function, and in turn specifies how to
+ get a frame's ID and prev_regs.
+
+ This exports the 'prev_register' and 'this_id' methods. */
+
+static const struct frame_unwind ms1_frame_unwind = {
+ NORMAL_FRAME,
+ ms1_frame_this_id,
+ ms1_frame_prev_register
+};
+
+/* The sniffer is a registered function that identifies our family of
+ frame unwind functions (this_id and prev_register). */
+
+static const struct frame_unwind *
+ms1_frame_sniffer (struct frame_info *next_frame)
+{
+ return &ms1_frame_unwind;
+}
+
+/* Another shared interface: the 'frame_base' object specifies how to
+ unwind a frame and secure the base addresses for frame objects
+ (locals, args). */
+
+static struct frame_base ms1_frame_base = {
+ &ms1_frame_unwind,
+ ms1_frame_base_address,
+ ms1_frame_base_address,
+ ms1_frame_base_address
+};
+
+static struct gdbarch *
+ms1_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch *gdbarch;
+ static void ms1_frame_unwind_init (struct gdbarch *);
+
+ /* Find a candidate among the list of pre-declared architectures. */
+ arches = gdbarch_list_lookup_by_info (arches, &info);
+ if (arches != NULL)
+ return arches->gdbarch;
+
+ /* None found, create a new architecture from the information
+ provided. */
+ gdbarch = gdbarch_alloc (&info, NULL);
+
+ switch (info.byte_order)
+ {
+ case BFD_ENDIAN_BIG:
+ set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_big);
+ set_gdbarch_double_format (gdbarch, &floatformat_ieee_double_big);
+ set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
+ break;
+ case BFD_ENDIAN_LITTLE:
+ set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_little);
+ set_gdbarch_double_format (gdbarch, &floatformat_ieee_double_little);
+ set_gdbarch_long_double_format (gdbarch,
+ &floatformat_ieee_double_little);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ _("ms1_gdbarch_init: bad byte order for float format"));
+ }
+
+ set_gdbarch_register_name (gdbarch, ms1_register_name);
+ set_gdbarch_num_regs (gdbarch, MS1_NUM_REGS);
+ set_gdbarch_num_pseudo_regs (gdbarch, MS1_NUM_PSEUDO_REGS);
+ set_gdbarch_pc_regnum (gdbarch, MS1_PC_REGNUM);
+ set_gdbarch_sp_regnum (gdbarch, MS1_SP_REGNUM);
+ set_gdbarch_pseudo_register_read (gdbarch, ms1_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, ms1_pseudo_register_write);
+ set_gdbarch_skip_prologue (gdbarch, ms1_skip_prologue);
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+ set_gdbarch_breakpoint_from_pc (gdbarch, ms1_breakpoint_from_pc);
+ set_gdbarch_decr_pc_after_break (gdbarch, 0);
+ set_gdbarch_frame_args_skip (gdbarch, 0);
+ set_gdbarch_print_insn (gdbarch, print_insn_ms1);
+ set_gdbarch_register_type (gdbarch, ms1_register_type);
+ set_gdbarch_register_reggroup_p (gdbarch, ms1_register_reggroup_p);
+
+ set_gdbarch_return_value (gdbarch, ms1_return_value);
+ set_gdbarch_sp_regnum (gdbarch, MS1_SP_REGNUM);
+
+ set_gdbarch_frame_align (gdbarch, ms1_frame_align);
+
+ set_gdbarch_print_registers_info (gdbarch, ms1_registers_info);
+
+ set_gdbarch_push_dummy_call (gdbarch, ms1_push_dummy_call);
+
+ /* Target builtin data types. */
+ set_gdbarch_short_bit (gdbarch, 16);
+ set_gdbarch_int_bit (gdbarch, 32);
+ set_gdbarch_long_bit (gdbarch, 32);
+ set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_float_bit (gdbarch, 32);
+ set_gdbarch_double_bit (gdbarch, 64);
+ set_gdbarch_long_double_bit (gdbarch, 64);
+ set_gdbarch_ptr_bit (gdbarch, 32);
+
+ /* Register the DWARF 2 sniffer first, and then the traditional prologue
+ based sniffer. */
+ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, ms1_frame_sniffer);
+ frame_base_set_default (gdbarch, &ms1_frame_base);
+
+ /* Register the 'unwind_pc' method. */
+ set_gdbarch_unwind_pc (gdbarch, ms1_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, ms1_unwind_sp);
+
+ /* Methods for saving / extracting a dummy frame's ID.
+ The ID's stack address must match the SP value returned by
+ PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */
+ set_gdbarch_unwind_dummy_id (gdbarch, ms1_unwind_dummy_id);
+
+ return gdbarch;
+}
+
+void
+_initialize_ms1_tdep (void)
+{
+ register_gdbarch_init (bfd_arch_ms1, ms1_gdbarch_init);
+}