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mt-tdep.c
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/* Target-dependent code for Morpho mt processor, for GDB.
Copyright (C) 2005-2015 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/>. */
/* Contributed by Michael Snyder, [email protected]. */
#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 "regcache.h"
#include "reggroups.h"
#include "gdbcore.h"
#include "trad-frame.h"
#include "inferior.h"
#include "dwarf2-frame.h"
#include "infcall.h"
#include "language.h"
#include "valprint.h"
enum mt_arch_constants
{
MT_MAX_STRUCT_SIZE = 16
};
enum mt_gdb_regnums
{
MT_R0_REGNUM, /* 32 bit regs. */
MT_R1_REGNUM,
MT_1ST_ARGREG = MT_R1_REGNUM,
MT_R2_REGNUM,
MT_R3_REGNUM,
MT_R4_REGNUM,
MT_LAST_ARGREG = MT_R4_REGNUM,
MT_R5_REGNUM,
MT_R6_REGNUM,
MT_R7_REGNUM,
MT_R8_REGNUM,
MT_R9_REGNUM,
MT_R10_REGNUM,
MT_R11_REGNUM,
MT_R12_REGNUM,
MT_FP_REGNUM = MT_R12_REGNUM,
MT_R13_REGNUM,
MT_SP_REGNUM = MT_R13_REGNUM,
MT_R14_REGNUM,
MT_RA_REGNUM = MT_R14_REGNUM,
MT_R15_REGNUM,
MT_IRA_REGNUM = MT_R15_REGNUM,
MT_PC_REGNUM,
/* Interrupt Enable pseudo-register, exported by SID. */
MT_INT_ENABLE_REGNUM,
/* End of CPU regs. */
MT_NUM_CPU_REGS,
/* Co-processor registers. */
MT_COPRO_REGNUM = MT_NUM_CPU_REGS, /* 16 bit regs. */
MT_CPR0_REGNUM,
MT_CPR1_REGNUM,
MT_CPR2_REGNUM,
MT_CPR3_REGNUM,
MT_CPR4_REGNUM,
MT_CPR5_REGNUM,
MT_CPR6_REGNUM,
MT_CPR7_REGNUM,
MT_CPR8_REGNUM,
MT_CPR9_REGNUM,
MT_CPR10_REGNUM,
MT_CPR11_REGNUM,
MT_CPR12_REGNUM,
MT_CPR13_REGNUM,
MT_CPR14_REGNUM,
MT_CPR15_REGNUM,
MT_BYPA_REGNUM, /* 32 bit regs. */
MT_BYPB_REGNUM,
MT_BYPC_REGNUM,
MT_FLAG_REGNUM,
MT_CONTEXT_REGNUM, /* 38 bits (treat as array of
six bytes). */
MT_MAC_REGNUM, /* 32 bits. */
MT_Z1_REGNUM, /* 16 bits. */
MT_Z2_REGNUM, /* 16 bits. */
MT_ICHANNEL_REGNUM, /* 32 bits. */
MT_ISCRAMB_REGNUM, /* 32 bits. */
MT_QSCRAMB_REGNUM, /* 32 bits. */
MT_OUT_REGNUM, /* 16 bits. */
MT_EXMAC_REGNUM, /* 32 bits (8 used). */
MT_QCHANNEL_REGNUM, /* 32 bits. */
MT_ZI2_REGNUM, /* 16 bits. */
MT_ZQ2_REGNUM, /* 16 bits. */
MT_CHANNEL2_REGNUM, /* 32 bits. */
MT_ISCRAMB2_REGNUM, /* 32 bits. */
MT_QSCRAMB2_REGNUM, /* 32 bits. */
MT_QCHANNEL2_REGNUM, /* 32 bits. */
/* Number of real registers. */
MT_NUM_REGS,
/* Pseudo-registers. */
MT_COPRO_PSEUDOREG_REGNUM = MT_NUM_REGS,
MT_MAC_PSEUDOREG_REGNUM,
MT_COPRO_PSEUDOREG_ARRAY,
MT_COPRO_PSEUDOREG_DIM_1 = 2,
MT_COPRO_PSEUDOREG_DIM_2 = 8,
/* The number of pseudo-registers for each coprocessor. These
include the real coprocessor registers, the pseudo-registe for
the coprocessor number, and the pseudo-register for the MAC. */
MT_COPRO_PSEUDOREG_REGS = MT_NUM_REGS - MT_NUM_CPU_REGS + 2,
/* The register number of the MAC, relative to a given coprocessor. */
MT_COPRO_PSEUDOREG_MAC_REGNUM = MT_COPRO_PSEUDOREG_REGS - 1,
/* Two pseudo-regs ('coprocessor' and 'mac'). */
MT_NUM_PSEUDO_REGS = 2 + (MT_COPRO_PSEUDOREG_REGS
* MT_COPRO_PSEUDOREG_DIM_1
* MT_COPRO_PSEUDOREG_DIM_2)
};
/* The tdep structure. */
struct gdbarch_tdep
{
/* ISA-specific types. */
struct type *copro_type;
};
/* Return name of register number specified by REGNUM. */
static const char *
mt_register_name (struct gdbarch *gdbarch, int regnum)
{
static const char *const 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",
"zi2", "zq2", "Ichannel2", "Iscramb2", "Qscramb2", "Qchannel2",
/* Pseudo-registers. */
"coprocessor", "MAC"
};
static const char *array_names[MT_COPRO_PSEUDOREG_REGS
* MT_COPRO_PSEUDOREG_DIM_1
* MT_COPRO_PSEUDOREG_DIM_2];
if (regnum < 0)
return "";
if (regnum < ARRAY_SIZE (register_names))
return register_names[regnum];
if (array_names[regnum - MT_COPRO_PSEUDOREG_ARRAY])
return array_names[regnum - MT_COPRO_PSEUDOREG_ARRAY];
{
char *name;
const char *stub;
unsigned dim_1;
unsigned dim_2;
unsigned index;
regnum -= MT_COPRO_PSEUDOREG_ARRAY;
index = regnum % MT_COPRO_PSEUDOREG_REGS;
dim_2 = (regnum / MT_COPRO_PSEUDOREG_REGS) % MT_COPRO_PSEUDOREG_DIM_2;
dim_1 = ((regnum / MT_COPRO_PSEUDOREG_REGS / MT_COPRO_PSEUDOREG_DIM_2)
% MT_COPRO_PSEUDOREG_DIM_1);
if (index == MT_COPRO_PSEUDOREG_MAC_REGNUM)
stub = register_names[MT_MAC_PSEUDOREG_REGNUM];
else if (index >= MT_NUM_REGS - MT_CPR0_REGNUM)
stub = "";
else
stub = register_names[index + MT_CPR0_REGNUM];
if (!*stub)
{
array_names[regnum] = stub;
return stub;
}
name = xmalloc (30);
sprintf (name, "copro_%d_%d_%s", dim_1, dim_2, stub);
array_names[regnum] = name;
return name;
}
}
/* Return the type of a coprocessor register. */
static struct type *
mt_copro_register_type (struct gdbarch *arch, int regnum)
{
switch (regnum)
{
case MT_INT_ENABLE_REGNUM:
case MT_ICHANNEL_REGNUM:
case MT_QCHANNEL_REGNUM:
case MT_ISCRAMB_REGNUM:
case MT_QSCRAMB_REGNUM:
return builtin_type (arch)->builtin_int32;
case MT_BYPA_REGNUM:
case MT_BYPB_REGNUM:
case MT_BYPC_REGNUM:
case MT_Z1_REGNUM:
case MT_Z2_REGNUM:
case MT_OUT_REGNUM:
case MT_ZI2_REGNUM:
case MT_ZQ2_REGNUM:
return builtin_type (arch)->builtin_int16;
case MT_EXMAC_REGNUM:
case MT_MAC_REGNUM:
return builtin_type (arch)->builtin_uint32;
case MT_CONTEXT_REGNUM:
return builtin_type (arch)->builtin_long_long;
case MT_FLAG_REGNUM:
return builtin_type (arch)->builtin_unsigned_char;
default:
if (regnum >= MT_CPR0_REGNUM && regnum <= MT_CPR15_REGNUM)
return builtin_type (arch)->builtin_int16;
else if (regnum == MT_CPR0_REGNUM + MT_COPRO_PSEUDOREG_MAC_REGNUM)
{
if (gdbarch_bfd_arch_info (arch)->mach == bfd_mach_mrisc2
|| gdbarch_bfd_arch_info (arch)->mach == bfd_mach_ms2)
return builtin_type (arch)->builtin_uint64;
else
return builtin_type (arch)->builtin_uint32;
}
else
return builtin_type (arch)->builtin_uint32;
}
}
/* Given ARCH and a register number specified by REGNUM, return the
type of that register. */
static struct type *
mt_register_type (struct gdbarch *arch, int regnum)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (arch);
if (regnum >= 0 && regnum < MT_NUM_REGS + MT_NUM_PSEUDO_REGS)
{
switch (regnum)
{
case MT_PC_REGNUM:
case MT_RA_REGNUM:
case MT_IRA_REGNUM:
return builtin_type (arch)->builtin_func_ptr;
case MT_SP_REGNUM:
case MT_FP_REGNUM:
return builtin_type (arch)->builtin_data_ptr;
case MT_COPRO_REGNUM:
case MT_COPRO_PSEUDOREG_REGNUM:
if (tdep->copro_type == NULL)
{
struct type *elt = builtin_type (arch)->builtin_int16;
tdep->copro_type = lookup_array_range_type (elt, 0, 1);
}
return tdep->copro_type;
case MT_MAC_PSEUDOREG_REGNUM:
return mt_copro_register_type (arch,
MT_CPR0_REGNUM
+ MT_COPRO_PSEUDOREG_MAC_REGNUM);
default:
if (regnum >= MT_R0_REGNUM && regnum <= MT_R15_REGNUM)
return builtin_type (arch)->builtin_int32;
else if (regnum < MT_COPRO_PSEUDOREG_ARRAY)
return mt_copro_register_type (arch, regnum);
else
{
regnum -= MT_COPRO_PSEUDOREG_ARRAY;
regnum %= MT_COPRO_PSEUDOREG_REGS;
regnum += MT_CPR0_REGNUM;
return mt_copro_register_type (arch, regnum);
}
}
}
internal_error (__FILE__, __LINE__,
_("mt_register_type: illegal register number %d"), regnum);
}
/* Return true if register REGNUM is a member of the register group
specified by GROUP. */
static int
mt_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 < MT_NUM_REGS + MT_NUM_PSEUDO_REGS
&& mt_register_name (gdbarch, regnum)[0] != '\0');
if (group == general_reggroup)
return (regnum >= MT_R0_REGNUM && regnum <= MT_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
mt_return_value (struct gdbarch *gdbarch, struct value *function,
struct type *type, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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, MT_R11_REGNUM, &addr);
read_memory (addr, readbuf, TYPE_LENGTH (type));
}
if (writebuf)
{
ULONGEST addr;
regcache_cooked_read_unsigned (regcache, MT_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, MT_R11_REGNUM, &temp);
store_unsigned_integer (readbuf, TYPE_LENGTH (type),
byte_order, 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, MT_R11_REGNUM, buf);
}
else /* (TYPE_LENGTH (type) == 4 */
regcache_cooked_write (regcache, MT_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
mt_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR func_addr = 0, func_end = 0;
const 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).symbol;
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, byte_order);
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 (BREAK).
The BP for ms2 is defined as 0x69000000 (illegal). */
static const gdb_byte *
mt_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr,
int *bp_size)
{
static gdb_byte ms1_breakpoint[] = { 0x68, 0, 0, 0 };
static gdb_byte ms2_breakpoint[] = { 0x69, 0, 0, 0 };
*bp_size = 4;
if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2)
return ms2_breakpoint;
return ms1_breakpoint;
}
/* Select the correct coprocessor register bank. Return the pseudo
regnum we really want to read. */
static int
mt_select_coprocessor (struct gdbarch *gdbarch,
struct regcache *regcache, int regno)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
unsigned index, base;
gdb_byte copro[4];
/* Get the copro pseudo regnum. */
regcache_raw_read (regcache, MT_COPRO_REGNUM, copro);
base = ((extract_signed_integer (&copro[0], 2, byte_order)
* MT_COPRO_PSEUDOREG_DIM_2)
+ extract_signed_integer (&copro[2], 2, byte_order));
regno -= MT_COPRO_PSEUDOREG_ARRAY;
index = regno % MT_COPRO_PSEUDOREG_REGS;
regno /= MT_COPRO_PSEUDOREG_REGS;
if (base != regno)
{
/* Select the correct coprocessor register bank. Invalidate the
coprocessor register cache. */
unsigned ix;
store_signed_integer (&copro[0], 2, byte_order,
regno / MT_COPRO_PSEUDOREG_DIM_2);
store_signed_integer (&copro[2], 2, byte_order,
regno % MT_COPRO_PSEUDOREG_DIM_2);
regcache_raw_write (regcache, MT_COPRO_REGNUM, copro);
/* We must flush the cache, as it is now invalid. */
for (ix = MT_NUM_CPU_REGS; ix != MT_NUM_REGS; ix++)
regcache_invalidate (regcache, ix);
}
return index;
}
/* Fetch the pseudo registers:
There are two regular 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).
Additionally there is an array of coprocessor registers which track
the coprocessor registers for each coprocessor. */
static enum register_status
mt_pseudo_register_read (struct gdbarch *gdbarch,
struct regcache *regcache, int regno, gdb_byte *buf)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
switch (regno)
{
case MT_COPRO_REGNUM:
case MT_COPRO_PSEUDOREG_REGNUM:
return regcache_raw_read (regcache, MT_COPRO_REGNUM, buf);
case MT_MAC_REGNUM:
case MT_MAC_PSEUDOREG_REGNUM:
if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2
|| gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2)
{
enum register_status status;
ULONGEST oldmac = 0, ext_mac = 0;
ULONGEST newmac;
status = regcache_cooked_read_unsigned (regcache, MT_MAC_REGNUM, &oldmac);
if (status != REG_VALID)
return status;
regcache_cooked_read_unsigned (regcache, MT_EXMAC_REGNUM, &ext_mac);
if (status != REG_VALID)
return status;
newmac =
(oldmac & 0xffffffff) | ((long long) (ext_mac & 0xff) << 32);
store_signed_integer (buf, 8, byte_order, newmac);
return REG_VALID;
}
else
return regcache_raw_read (regcache, MT_MAC_REGNUM, buf);
break;
default:
{
unsigned index = mt_select_coprocessor (gdbarch, regcache, regno);
if (index == MT_COPRO_PSEUDOREG_MAC_REGNUM)
return mt_pseudo_register_read (gdbarch, regcache,
MT_MAC_PSEUDOREG_REGNUM, buf);
else if (index < MT_NUM_REGS - MT_CPR0_REGNUM)
return regcache_raw_read (regcache, index + MT_CPR0_REGNUM, buf);
else
/* ??? */
return REG_VALID;
}
break;
}
}
/* Write the pseudo registers:
Mt 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
mt_pseudo_register_write (struct gdbarch *gdbarch,
struct regcache *regcache,
int regno, const gdb_byte *buf)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int i;
switch (regno)
{
case MT_COPRO_REGNUM:
case MT_COPRO_PSEUDOREG_REGNUM:
regcache_raw_write (regcache, MT_COPRO_REGNUM, buf);
for (i = MT_NUM_CPU_REGS; i < MT_NUM_REGS; i++)
regcache_invalidate (regcache, i);
break;
case MT_MAC_REGNUM:
case MT_MAC_PSEUDOREG_REGNUM:
if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2
|| gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2)
{
/* 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, byte_order);
oldmac = newmac & 0xffffffff;
ext_mac = (newmac >> 32) & 0xff;
regcache_cooked_write_unsigned (regcache, MT_MAC_REGNUM, oldmac);
regcache_cooked_write_unsigned (regcache, MT_EXMAC_REGNUM, ext_mac);
}
else
regcache_raw_write (regcache, MT_MAC_REGNUM, buf);
break;
default:
{
unsigned index = mt_select_coprocessor (gdbarch, regcache, regno);
if (index == MT_COPRO_PSEUDOREG_MAC_REGNUM)
mt_pseudo_register_write (gdbarch, regcache,
MT_MAC_PSEUDOREG_REGNUM, buf);
else if (index < MT_NUM_REGS - MT_CPR0_REGNUM)
regcache_raw_write (regcache, index + MT_CPR0_REGNUM, buf);
}
break;
}
}
static CORE_ADDR
mt_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
mt_registers_info (struct gdbarch *gdbarch,
struct ui_file *file,
struct frame_info *frame, int regnum, int all)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
if (regnum == -1)
{
int lim;
lim = all ? MT_NUM_REGS : MT_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 == MT_QCHANNEL_REGNUM)
continue;
mt_registers_info (gdbarch, file, frame, regnum, all);
/* Display the Qchannel register immediately after Ichannel. */
if (regnum == MT_ICHANNEL_REGNUM)
mt_registers_info (gdbarch, file, frame, MT_QCHANNEL_REGNUM, all);
}
}
else
{
if (regnum == MT_EXMAC_REGNUM)
return;
else if (regnum == MT_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 = XALLOCAVEC (unsigned int, regsize);
deprecated_frame_register_read (frame, regnum, buff);
fputs_filtered (gdbarch_register_name
(gdbarch, regnum), file);
print_spaces_filtered (15 - strlen (gdbarch_register_name
(gdbarch, regnum)),
file);
fputs_filtered ("0x", file);
for (i = 0; i < regsize; i++)
fprintf_filtered (file, "%02x", (unsigned int)
extract_unsigned_integer (buff + i, 1, byte_order));
fputs_filtered ("\t", file);
print_longest (file, 'd', 0,
extract_unsigned_integer (buff, regsize, byte_order));
fputs_filtered ("\n", file);
}
else if (regnum == MT_COPRO_REGNUM
|| regnum == MT_COPRO_PSEUDOREG_REGNUM)
{
/* Special output handling for the 'coprocessor' register. */
gdb_byte *buf;
struct value_print_options opts;
buf = alloca (register_size (gdbarch, MT_COPRO_REGNUM));
deprecated_frame_register_read (frame, MT_COPRO_REGNUM, buf);
/* And print. */
regnum = MT_COPRO_PSEUDOREG_REGNUM;
fputs_filtered (gdbarch_register_name (gdbarch, regnum),
file);
print_spaces_filtered (15 - strlen (gdbarch_register_name
(gdbarch, regnum)),
file);
get_no_prettyformat_print_options (&opts);
opts.deref_ref = 1;
val_print (register_type (gdbarch, regnum), buf,
0, 0, file, 0, NULL,
&opts, current_language);
fputs_filtered ("\n", file);
}
else if (regnum == MT_MAC_REGNUM || regnum == MT_MAC_PSEUDOREG_REGNUM)
{
ULONGEST oldmac, ext_mac, newmac;
gdb_byte buf[3 * sizeof (LONGEST)];
/* Get the two "real" mac registers. */
deprecated_frame_register_read (frame, MT_MAC_REGNUM, buf);
oldmac = extract_unsigned_integer
(buf, register_size (gdbarch, MT_MAC_REGNUM), byte_order);
if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2
|| gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2)
{
deprecated_frame_register_read (frame, MT_EXMAC_REGNUM, buf);
ext_mac = extract_unsigned_integer
(buf, register_size (gdbarch, MT_EXMAC_REGNUM), byte_order);
}
else
ext_mac = 0;
/* Add them together. */
newmac = (oldmac & 0xffffffff) + ((ext_mac & 0xff) << 32);
/* And print. */
regnum = MT_MAC_PSEUDOREG_REGNUM;
fputs_filtered (gdbarch_register_name (gdbarch, regnum),
file);
print_spaces_filtered (15 - strlen (gdbarch_register_name
(gdbarch, 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
mt_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
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte buf[MT_MAX_STRUCT_SIZE];
int argreg = MT_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 MT_1ST_ARGREG thru
MT_LAST_ARGREG. */
for (i = 0; i < nargs && argreg <= MT_LAST_ARGREG; i++)
{
const gdb_byte *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, byte_order));
break;
case 8:
case 12:
case 16:
val = value_contents (args[i]);
while (typelen > 0)
{
if (argreg <= MT_LAST_ARGREG)
{
/* This word of the argument is passed in a register. */
regcache_cooked_write_unsigned (regcache, argreg++,
extract_unsigned_integer
(val, wordsize, byte_order));
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--)
{
gdb_byte *val;
struct cleanup *back_to;
const gdb_byte *contents = value_contents (args[j]);
/* Right-justify the value in an aligned-length buffer. */
typelen = TYPE_LENGTH (value_type (args[j]));
slacklen = (wordsize - (typelen % wordsize)) % wordsize;
val = xmalloc (typelen + slacklen);
back_to = make_cleanup (xfree, val);
memcpy (val, contents, typelen);
memset (val + typelen, 0, slacklen);
/* Now write this data to the stack. */
stack_dest -= typelen + slacklen;
write_memory (stack_dest, val, typelen + slacklen);
do_cleanups (back_to);
}
/* 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, MT_RA_REGNUM, bp_addr);
/* Store struct return address, if given. */
if (struct_return && struct_addr != 0)
regcache_cooked_write_unsigned (regcache, MT_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, MT_SP_REGNUM, stack_dest);
/* And that should do it. Return the new stack pointer. */
return stack_dest;
}
/* The 'unwind_cache' data structure. */
struct mt_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 mt_unwind_cache *
mt_frame_unwind_cache (struct frame_info *this_frame,
void **this_prologue_cache)
{
struct gdbarch *gdbarch;
struct mt_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 (this_frame);
info = FRAME_OBSTACK_ZALLOC (struct mt_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 (this_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. */
sp = get_frame_register_unsigned (this_frame, MT_SP_REGNUM);
fp = get_frame_register_unsigned (this_frame, MT_FP_REGNUM);
start_addr = get_frame_func (this_frame);
/* Return early if GDB couldn't find the function. */
if (start_addr == 0)
return info;
end_addr = get_frame_pc (this_frame);
prologue_end_addr = skip_prologue_using_sal (gdbarch, start_addr);
if (end_addr == 0)
for (next_addr = start_addr; next_addr < end_addr; next_addr += 4)
{
instr = get_frame_memory_unsigned (this_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.