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score-tdep.c
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/* Target-dependent code for the S+core architecture, for GDB,
the GNU Debugger.
Copyright (C) 2006-2015 Free Software Foundation, Inc.
Contributed by Qinwei ([email protected])
Contributed by Ching-Peng Lin ([email protected])
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 "defs.h"
#include "inferior.h"
#include "symtab.h"
#include "objfiles.h"
#include "gdbcore.h"
#include "target.h"
#include "arch-utils.h"
#include "regcache.h"
#include "regset.h"
#include "dis-asm.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "trad-frame.h"
#include "dwarf2-frame.h"
#include "score-tdep.h"
#define G_FLD(_i,_ms,_ls) \
((unsigned)((_i) << (31 - (_ms))) >> (31 - (_ms) + (_ls)))
typedef struct{
unsigned long long v;
unsigned long long raw;
unsigned int len;
}inst_t;
struct score_frame_cache
{
CORE_ADDR base;
CORE_ADDR fp;
struct trad_frame_saved_reg *saved_regs;
};
static int target_mach = bfd_mach_score7;
static struct type *
score_register_type (struct gdbarch *gdbarch, int regnum)
{
gdb_assert (regnum >= 0
&& regnum < ((target_mach == bfd_mach_score7)
? SCORE7_NUM_REGS : SCORE3_NUM_REGS));
return builtin_type (gdbarch)->builtin_uint32;
}
static CORE_ADDR
score_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM);
}
static CORE_ADDR
score_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_unsigned (next_frame, SCORE_PC_REGNUM);
}
static const char *
score7_register_name (struct gdbarch *gdbarch, int regnum)
{
const char *score_register_names[] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
"PSR", "COND", "ECR", "EXCPVEC", "CCR",
"EPC", "EMA", "TLBLOCK", "TLBPT", "PEADDR",
"TLBRPT", "PEVN", "PECTX", "LIMPFN", "LDMPFN",
"PREV", "DREG", "PC", "DSAVE", "COUNTER",
"LDCR", "STCR", "CEH", "CEL",
};
gdb_assert (regnum >= 0 && regnum < SCORE7_NUM_REGS);
return score_register_names[regnum];
}
static const char *
score3_register_name (struct gdbarch *gdbarch, int regnum)
{
const char *score_register_names[] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
"PSR", "COND", "ECR", "EXCPVEC", "CCR",
"EPC", "EMA", "PREV", "DREG", "DSAVE",
"COUNTER", "LDCR", "STCR", "CEH", "CEL",
"", "", "PC",
};
gdb_assert (regnum >= 0 && regnum < SCORE3_NUM_REGS);
return score_register_names[regnum];
}
#if WITH_SIM
static int
score_register_sim_regno (struct gdbarch *gdbarch, int regnum)
{
gdb_assert (regnum >= 0
&& regnum < ((target_mach == bfd_mach_score7)
? SCORE7_NUM_REGS : SCORE3_NUM_REGS));
return regnum;
}
#endif
static int
score_print_insn (bfd_vma memaddr, struct disassemble_info *info)
{
if (info->endian == BFD_ENDIAN_BIG)
return print_insn_big_score (memaddr, info);
else
return print_insn_little_score (memaddr, info);
}
static inst_t *
score7_fetch_inst (struct gdbarch *gdbarch, CORE_ADDR addr, gdb_byte *memblock)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
static inst_t inst = { 0, 0, 0 };
gdb_byte buf[SCORE_INSTLEN] = { 0 };
int big;
int ret;
if (target_has_execution && memblock != NULL)
{
/* Fetch instruction from local MEMBLOCK. */
memcpy (buf, memblock, SCORE_INSTLEN);
}
else
{
/* Fetch instruction from target. */
ret = target_read_memory (addr & ~0x3, buf, SCORE_INSTLEN);
if (ret)
{
error (_("Error: target_read_memory in file:%s, line:%d!"),
__FILE__, __LINE__);
return 0;
}
}
inst.raw = extract_unsigned_integer (buf, SCORE_INSTLEN, byte_order);
inst.len = (inst.raw & 0x80008000) ? 4 : 2;
inst.v = ((inst.raw >> 16 & 0x7FFF) << 15) | (inst.raw & 0x7FFF);
big = (byte_order == BFD_ENDIAN_BIG);
if (inst.len == 2)
{
if (big ^ ((addr & 0x2) == 2))
inst.v = G_FLD (inst.v, 29, 15);
else
inst.v = G_FLD (inst.v, 14, 0);
}
return &inst;
}
static inst_t *
score3_adjust_pc_and_fetch_inst (CORE_ADDR *pcptr, int *lenptr,
enum bfd_endian byte_order)
{
static inst_t inst = { 0, 0, 0 };
struct breakplace
{
int break_offset;
int inst_len;
};
/* raw table 1 (column 2, 3, 4)
* 0 1 0 * # 2
* 0 1 1 0 # 3
0 1 1 0 * # 6
table 2 (column 1, 2, 3)
* 0 0 * * # 0, 4
0 1 0 * * # 2
1 1 0 * * # 6
*/
static const struct breakplace bk_table[16] =
{
/* table 1 */
{0, 0},
{0, 0},
{0, 4},
{0, 6},
{0, 0},
{0, 0},
{-2, 6},
{0, 0},
/* table 2 */
{0, 2},
{0, 0},
{-2, 4},
{0, 0},
{0, 2},
{0, 0},
{-4, 6},
{0, 0}
};
#define EXTRACT_LEN 2
CORE_ADDR adjust_pc = *pcptr & ~0x1;
gdb_byte buf[5][EXTRACT_LEN] =
{
{'\0', '\0'},
{'\0', '\0'},
{'\0', '\0'},
{'\0', '\0'},
{'\0', '\0'}
};
int ret;
unsigned int raw;
unsigned int cbits = 0;
int bk_index;
int i, count;
inst.v = 0;
inst.raw = 0;
inst.len = 0;
adjust_pc -= 4;
for (i = 0; i < 5; i++)
{
ret = target_read_memory (adjust_pc + 2 * i, buf[i], EXTRACT_LEN);
if (ret != 0)
{
buf[i][0] = '\0';
buf[i][1] = '\0';
if (i == 2)
error (_("Error: target_read_memory in file:%s, line:%d!"),
__FILE__, __LINE__);
}
raw = extract_unsigned_integer (buf[i], EXTRACT_LEN, byte_order);
cbits = (cbits << 1) | (raw >> 15);
}
adjust_pc += 4;
if (cbits & 0x4)
{
/* table 1 */
cbits = (cbits >> 1) & 0x7;
bk_index = cbits;
}
else
{
/* table 2 */
cbits = (cbits >> 2) & 0x7;
bk_index = cbits + 8;
}
gdb_assert (!((bk_table[bk_index].break_offset == 0)
&& (bk_table[bk_index].inst_len == 0)));
inst.len = bk_table[bk_index].inst_len;
i = (bk_table[bk_index].break_offset + 4) / 2;
count = inst.len / 2;
for (; count > 0; i++, count--)
{
inst.raw = (inst.raw << 16)
| extract_unsigned_integer (buf[i], EXTRACT_LEN, byte_order);
}
switch (inst.len)
{
case 2:
inst.v = inst.raw & 0x7FFF;
break;
case 4:
inst.v = ((inst.raw >> 16 & 0x7FFF) << 15) | (inst.raw & 0x7FFF);
break;
case 6:
inst.v = ((inst.raw >> 32 & 0x7FFF) << 30)
| ((inst.raw >> 16 & 0x7FFF) << 15) | (inst.raw & 0x7FFF);
break;
}
if (pcptr)
*pcptr = adjust_pc + bk_table[bk_index].break_offset;
if (lenptr)
*lenptr = bk_table[bk_index].inst_len;
#undef EXTRACT_LEN
return &inst;
}
static const gdb_byte *
score7_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr,
int *lenptr)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte buf[SCORE_INSTLEN] = { 0 };
int ret;
unsigned int raw;
if ((ret = target_read_memory (*pcptr & ~0x3, buf, SCORE_INSTLEN)) != 0)
{
error (_("Error: target_read_memory in file:%s, line:%d!"),
__FILE__, __LINE__);
}
raw = extract_unsigned_integer (buf, SCORE_INSTLEN, byte_order);
if (byte_order == BFD_ENDIAN_BIG)
{
if (!(raw & 0x80008000))
{
/* 16bits instruction. */
static gdb_byte big_breakpoint16[] = { 0x60, 0x02 };
*pcptr &= ~0x1;
*lenptr = sizeof (big_breakpoint16);
return big_breakpoint16;
}
else
{
/* 32bits instruction. */
static gdb_byte big_breakpoint32[] = { 0x80, 0x00, 0x80, 0x06 };
*pcptr &= ~0x3;
*lenptr = sizeof (big_breakpoint32);
return big_breakpoint32;
}
}
else
{
if (!(raw & 0x80008000))
{
/* 16bits instruction. */
static gdb_byte little_breakpoint16[] = { 0x02, 0x60 };
*pcptr &= ~0x1;
*lenptr = sizeof (little_breakpoint16);
return little_breakpoint16;
}
else
{
/* 32bits instruction. */
static gdb_byte little_breakpoint32[] = { 0x06, 0x80, 0x00, 0x80 };
*pcptr &= ~0x3;
*lenptr = sizeof (little_breakpoint32);
return little_breakpoint32;
}
}
}
static const gdb_byte *
score3_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr,
int *lenptr)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR adjust_pc = *pcptr;
int len;
static gdb_byte score_break_insns[6][6] = {
/* The following three instructions are big endian. */
{ 0x00, 0x20 },
{ 0x80, 0x00, 0x00, 0x06 },
{ 0x80, 0x00, 0x80, 0x00, 0x00, 0x00 },
/* The following three instructions are little endian. */
{ 0x20, 0x00 },
{ 0x00, 0x80, 0x06, 0x00 },
{ 0x00, 0x80, 0x00, 0x80, 0x00, 0x00 }};
gdb_byte *p = NULL;
int index = 0;
score3_adjust_pc_and_fetch_inst (&adjust_pc, &len, byte_order);
index = ((byte_order == BFD_ENDIAN_BIG) ? 0 : 3) + (len / 2 - 1);
p = score_break_insns[index];
*pcptr = adjust_pc;
*lenptr = len;
return p;
}
static CORE_ADDR
score_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
{
CORE_ADDR adjust_pc = bpaddr;
if (target_mach == bfd_mach_score3)
score3_adjust_pc_and_fetch_inst (&adjust_pc, NULL,
gdbarch_byte_order (gdbarch));
else
adjust_pc = align_down (adjust_pc, 2);
return adjust_pc;
}
static CORE_ADDR
score_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
{
return align_down (addr, 16);
}
static void
score_xfer_register (struct regcache *regcache, int regnum, int length,
enum bfd_endian endian, gdb_byte *readbuf,
const gdb_byte *writebuf, int buf_offset)
{
int reg_offset = 0;
gdb_assert (regnum >= 0
&& regnum < ((target_mach == bfd_mach_score7)
? SCORE7_NUM_REGS : SCORE3_NUM_REGS));
switch (endian)
{
case BFD_ENDIAN_BIG:
reg_offset = SCORE_REGSIZE - length;
break;
case BFD_ENDIAN_LITTLE:
reg_offset = 0;
break;
case BFD_ENDIAN_UNKNOWN:
reg_offset = 0;
break;
default:
error (_("Error: score_xfer_register in file:%s, line:%d!"),
__FILE__, __LINE__);
}
if (readbuf != NULL)
regcache_cooked_read_part (regcache, regnum, reg_offset, length,
readbuf + buf_offset);
if (writebuf != NULL)
regcache_cooked_write_part (regcache, regnum, reg_offset, length,
writebuf + buf_offset);
}
static enum return_value_convention
score_return_value (struct gdbarch *gdbarch, struct value *function,
struct type *type, struct regcache *regcache,
gdb_byte * readbuf, const gdb_byte * writebuf)
{
if (TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION
|| TYPE_CODE (type) == TYPE_CODE_ARRAY)
return RETURN_VALUE_STRUCT_CONVENTION;
else
{
int offset;
int regnum;
for (offset = 0, regnum = SCORE_A0_REGNUM;
offset < TYPE_LENGTH (type);
offset += SCORE_REGSIZE, regnum++)
{
int xfer = SCORE_REGSIZE;
if (offset + xfer > TYPE_LENGTH (type))
xfer = TYPE_LENGTH (type) - offset;
score_xfer_register (regcache, regnum, xfer,
gdbarch_byte_order(gdbarch),
readbuf, writebuf, offset);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
}
static struct frame_id
score_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
{
return frame_id_build (get_frame_register_unsigned (this_frame,
SCORE_SP_REGNUM),
get_frame_pc (this_frame));
}
static int
score_type_needs_double_align (struct type *type)
{
enum type_code typecode = TYPE_CODE (type);
if ((typecode == TYPE_CODE_INT && TYPE_LENGTH (type) == 8)
|| (typecode == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8))
return 1;
else if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)
{
int i, n;
n = TYPE_NFIELDS (type);
for (i = 0; i < n; i++)
if (score_type_needs_double_align (TYPE_FIELD_TYPE (type, i)))
return 1;
return 0;
}
return 0;
}
static CORE_ADDR
score_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)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int argnum;
int argreg;
int arglen = 0;
CORE_ADDR stack_offset = 0;
CORE_ADDR addr = 0;
/* Step 1, Save RA. */
regcache_cooked_write_unsigned (regcache, SCORE_RA_REGNUM, bp_addr);
/* Step 2, Make space on the stack for the args. */
struct_addr = align_down (struct_addr, 16);
sp = align_down (sp, 16);
for (argnum = 0; argnum < nargs; argnum++)
arglen += align_up (TYPE_LENGTH (value_type (args[argnum])),
SCORE_REGSIZE);
sp -= align_up (arglen, 16);
argreg = SCORE_BEGIN_ARG_REGNUM;
/* Step 3, Check if struct return then save the struct address to
r4 and increase the stack_offset by 4. */
if (struct_return)
{
regcache_cooked_write_unsigned (regcache, argreg++, struct_addr);
stack_offset += SCORE_REGSIZE;
}
/* Step 4, Load arguments:
If arg length is too long (> 4 bytes), then split the arg and
save every parts. */
for (argnum = 0; argnum < nargs; argnum++)
{
struct value *arg = args[argnum];
struct type *arg_type = check_typedef (value_type (arg));
enum type_code typecode = TYPE_CODE (arg_type);
const gdb_byte *val = value_contents (arg);
int downward_offset = 0;
int odd_sized_struct_p;
int arg_last_part_p = 0;
arglen = TYPE_LENGTH (arg_type);
odd_sized_struct_p = (arglen > SCORE_REGSIZE
&& arglen % SCORE_REGSIZE != 0);
/* If a arg should be aligned to 8 bytes (long long or double),
the value should be put to even register numbers. */
if (score_type_needs_double_align (arg_type))
{
if (argreg & 1)
argreg++;
}
/* If sizeof a block < SCORE_REGSIZE, then Score GCC will chose
the default "downward"/"upward" method:
Example:
struct struc
{
char a; char b; char c;
} s = {'a', 'b', 'c'};
Big endian: s = {X, 'a', 'b', 'c'}
Little endian: s = {'a', 'b', 'c', X}
Where X is a hole. */
if (gdbarch_byte_order(gdbarch) == BFD_ENDIAN_BIG
&& (typecode == TYPE_CODE_STRUCT
|| typecode == TYPE_CODE_UNION)
&& argreg > SCORE_LAST_ARG_REGNUM
&& arglen < SCORE_REGSIZE)
downward_offset += (SCORE_REGSIZE - arglen);
while (arglen > 0)
{
int partial_len = arglen < SCORE_REGSIZE ? arglen : SCORE_REGSIZE;
ULONGEST regval = extract_unsigned_integer (val, partial_len,
byte_order);
/* The last part of a arg should shift left when
gdbarch_byte_order is BFD_ENDIAN_BIG. */
if (byte_order == BFD_ENDIAN_BIG
&& arg_last_part_p == 1
&& (typecode == TYPE_CODE_STRUCT
|| typecode == TYPE_CODE_UNION))
regval <<= ((SCORE_REGSIZE - partial_len) * TARGET_CHAR_BIT);
/* Always increase the stack_offset and save args to stack. */
addr = sp + stack_offset + downward_offset;
write_memory (addr, val, partial_len);
if (argreg <= SCORE_LAST_ARG_REGNUM)
{
regcache_cooked_write_unsigned (regcache, argreg++, regval);
if (arglen > SCORE_REGSIZE && arglen < SCORE_REGSIZE * 2)
arg_last_part_p = 1;
}
val += partial_len;
arglen -= partial_len;
stack_offset += align_up (partial_len, SCORE_REGSIZE);
}
}
/* Step 5, Save SP. */
regcache_cooked_write_unsigned (regcache, SCORE_SP_REGNUM, sp);
return sp;
}
static CORE_ADDR
score7_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
CORE_ADDR cpc = pc;
int iscan = 32, stack_sub = 0;
while (iscan-- > 0)
{
inst_t *inst = score7_fetch_inst (gdbarch, cpc, NULL);
if (!inst)
break;
if ((inst->len == 4) && !stack_sub
&& (G_FLD (inst->v, 29, 25) == 0x1
&& G_FLD (inst->v, 24, 20) == 0x0))
{
/* addi r0, offset */
stack_sub = cpc + SCORE_INSTLEN;
pc = cpc + SCORE_INSTLEN;
}
else if ((inst->len == 4)
&& (G_FLD (inst->v, 29, 25) == 0x0)
&& (G_FLD (inst->v, 24, 20) == 0x2)
&& (G_FLD (inst->v, 19, 15) == 0x0)
&& (G_FLD (inst->v, 14, 10) == 0xF)
&& (G_FLD (inst->v, 9, 0) == 0x56))
{
/* mv r2, r0 */
pc = cpc + SCORE_INSTLEN;
break;
}
else if ((inst->len == 2)
&& (G_FLD (inst->v, 14, 12) == 0x0)
&& (G_FLD (inst->v, 11, 8) == 0x2)
&& (G_FLD (inst->v, 7, 4) == 0x0)
&& (G_FLD (inst->v, 3, 0) == 0x3))
{
/* mv! r2, r0 */
pc = cpc + SCORE16_INSTLEN;
break;
}
else if ((inst->len == 2)
&& ((G_FLD (inst->v, 14, 12) == 3) /* j15 form */
|| (G_FLD (inst->v, 14, 12) == 4) /* b15 form */
|| (G_FLD (inst->v, 14, 12) == 0x0
&& G_FLD (inst->v, 3, 0) == 0x4))) /* br! */
break;
else if ((inst->len == 4)
&& ((G_FLD (inst->v, 29, 25) == 2) /* j32 form */
|| (G_FLD (inst->v, 29, 25) == 4) /* b32 form */
|| (G_FLD (inst->v, 29, 25) == 0x0
&& G_FLD (inst->v, 6, 1) == 0x4))) /* br */
break;
cpc += (inst->len == 2) ? SCORE16_INSTLEN : SCORE_INSTLEN;
}
return pc;
}
static CORE_ADDR
score3_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
CORE_ADDR cpc = pc;
int iscan = 32, stack_sub = 0;
while (iscan-- > 0)
{
inst_t *inst
= score3_adjust_pc_and_fetch_inst (&cpc, NULL,
gdbarch_byte_order (gdbarch));
if (!inst)
break;
if (inst->len == 4 && !stack_sub
&& (G_FLD (inst->v, 29, 25) == 0x1)
&& (G_FLD (inst->v, 19, 17) == 0x0)
&& (G_FLD (inst->v, 24, 20) == 0x0))
{
/* addi r0, offset */
stack_sub = cpc + inst->len;
pc = cpc + inst->len;
}
else if (inst->len == 4
&& (G_FLD (inst->v, 29, 25) == 0x0)
&& (G_FLD (inst->v, 24, 20) == 0x2)
&& (G_FLD (inst->v, 19, 15) == 0x0)
&& (G_FLD (inst->v, 14, 10) == 0xF)
&& (G_FLD (inst->v, 9, 0) == 0x56))
{
/* mv r2, r0 */
pc = cpc + inst->len;
break;
}
else if ((inst->len == 2)
&& (G_FLD (inst->v, 14, 10) == 0x10)
&& (G_FLD (inst->v, 9, 5) == 0x2)
&& (G_FLD (inst->v, 4, 0) == 0x0))
{
/* mv! r2, r0 */
pc = cpc + inst->len;
break;
}
else if (inst->len == 2
&& ((G_FLD (inst->v, 14, 12) == 3) /* b15 form */
|| (G_FLD (inst->v, 14, 12) == 0x0
&& G_FLD (inst->v, 11, 5) == 0x4))) /* br! */
break;
else if (inst->len == 4
&& ((G_FLD (inst->v, 29, 25) == 2) /* j32 form */
|| (G_FLD (inst->v, 29, 25) == 4))) /* b32 form */
break;
cpc += inst->len;
}
return pc;
}
/* Implement the stack_frame_destroyed_p gdbarch method. */
static int
score7_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR cur_pc)
{
inst_t *inst = score7_fetch_inst (gdbarch, cur_pc, NULL);
if (inst->v == 0x23)
return 1; /* mv! r0, r2 */
else if (G_FLD (inst->v, 14, 12) == 0x2
&& G_FLD (inst->v, 3, 0) == 0xa)
return 1; /* pop! */
else if (G_FLD (inst->v, 14, 12) == 0x0
&& G_FLD (inst->v, 7, 0) == 0x34)
return 1; /* br! r3 */
else if (G_FLD (inst->v, 29, 15) == 0x2
&& G_FLD (inst->v, 6, 1) == 0x2b)
return 1; /* mv r0, r2 */
else if (G_FLD (inst->v, 29, 25) == 0x0
&& G_FLD (inst->v, 6, 1) == 0x4
&& G_FLD (inst->v, 19, 15) == 0x3)
return 1; /* br r3 */
else
return 0;
}
/* Implement the stack_frame_destroyed_p gdbarch method. */
static int
score3_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR cur_pc)
{
CORE_ADDR pc = cur_pc;
inst_t *inst
= score3_adjust_pc_and_fetch_inst (&pc, NULL,
gdbarch_byte_order (gdbarch));
if (inst->len == 2
&& (G_FLD (inst->v, 14, 10) == 0x10)
&& (G_FLD (inst->v, 9, 5) == 0x0)
&& (G_FLD (inst->v, 4, 0) == 0x2))
return 1; /* mv! r0, r2 */
else if (inst->len == 4
&& (G_FLD (inst->v, 29, 25) == 0x0)
&& (G_FLD (inst->v, 24, 20) == 0x2)
&& (G_FLD (inst->v, 19, 15) == 0x0)
&& (G_FLD (inst->v, 14, 10) == 0xF)
&& (G_FLD (inst->v, 9, 0) == 0x56))
return 1; /* mv r0, r2 */
else if (inst->len == 2
&& (G_FLD (inst->v, 14, 12) == 0x0)
&& (G_FLD (inst->v, 11, 5) == 0x2))
return 1; /* pop! */
else if (inst->len == 2
&& (G_FLD (inst->v, 14, 12) == 0x0)
&& (G_FLD (inst->v, 11, 7) == 0x0)
&& (G_FLD (inst->v, 6, 5) == 0x2))
return 1; /* rpop! */
else if (inst->len == 2
&& (G_FLD (inst->v, 14, 12) == 0x0)
&& (G_FLD (inst->v, 11, 5) == 0x4)
&& (G_FLD (inst->v, 4, 0) == 0x3))
return 1; /* br! r3 */
else if (inst->len == 4
&& (G_FLD (inst->v, 29, 25) == 0x0)
&& (G_FLD (inst->v, 24, 20) == 0x0)
&& (G_FLD (inst->v, 19, 15) == 0x3)
&& (G_FLD (inst->v, 14, 10) == 0xF)
&& (G_FLD (inst->v, 9, 0) == 0x8))
return 1; /* br r3 */
else
return 0;
}
static gdb_byte *
score7_malloc_and_get_memblock (CORE_ADDR addr, CORE_ADDR size)
{
int ret;
gdb_byte *memblock = NULL;
if (size < 0)
{
error (_("Error: malloc size < 0 in file:%s, line:%d!"),
__FILE__, __LINE__);
return NULL;
}
else if (size == 0)
return NULL;
memblock = xmalloc (size);
memset (memblock, 0, size);
ret = target_read_memory (addr & ~0x3, memblock, size);
if (ret)
{
error (_("Error: target_read_memory in file:%s, line:%d!"),
__FILE__, __LINE__);
return NULL;
}
return memblock;
}
static void
score7_free_memblock (gdb_byte *memblock)
{
xfree (memblock);
}
static void
score7_adjust_memblock_ptr (gdb_byte **memblock, CORE_ADDR prev_pc,
CORE_ADDR cur_pc)
{
if (prev_pc == -1)
{
/* First time call this function, do nothing. */
}
else if (cur_pc - prev_pc == 2 && (cur_pc & 0x3) == 0)
{
/* First 16-bit instruction, then 32-bit instruction. */
*memblock += SCORE_INSTLEN;
}
else if (cur_pc - prev_pc == 4)
{
/* Is 32-bit instruction, increase MEMBLOCK by 4. */
*memblock += SCORE_INSTLEN;
}
}
static void
score7_analyze_prologue (CORE_ADDR startaddr, CORE_ADDR pc,
struct frame_info *this_frame,
struct score_frame_cache *this_cache)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
CORE_ADDR sp;
CORE_ADDR fp;
CORE_ADDR cur_pc = startaddr;
int sp_offset = 0;
int ra_offset = 0;
int fp_offset = 0;
int ra_offset_p = 0;
int fp_offset_p = 0;
int inst_len = 0;
gdb_byte *memblock = NULL;
gdb_byte *memblock_ptr = NULL;
CORE_ADDR prev_pc = -1;
/* Allocate MEMBLOCK if PC - STARTADDR > 0. */
memblock_ptr = memblock =
score7_malloc_and_get_memblock (startaddr, pc - startaddr);
sp = get_frame_register_unsigned (this_frame, SCORE_SP_REGNUM);
fp = get_frame_register_unsigned (this_frame, SCORE_FP_REGNUM);
for (; cur_pc < pc; prev_pc = cur_pc, cur_pc += inst_len)
{
inst_t *inst = NULL;
if (memblock != NULL)
{
/* Reading memory block from target succefully and got all
the instructions(from STARTADDR to PC) needed. */
score7_adjust_memblock_ptr (&memblock, prev_pc, cur_pc);
inst = score7_fetch_inst (gdbarch, cur_pc, memblock);
}
else
{
/* Otherwise, we fetch 4 bytes from target, and GDB also
work correctly. */
inst = score7_fetch_inst (gdbarch, cur_pc, NULL);
}
/* FIXME: make a full-power prologue analyzer. */
if (inst->len == 2)
{
inst_len = SCORE16_INSTLEN;
if (G_FLD (inst->v, 14, 12) == 0x2
&& G_FLD (inst->v, 3, 0) == 0xe)
{
/* push! */
sp_offset += 4;
if (G_FLD (inst->v, 11, 7) == 0x6
&& ra_offset_p == 0)
{
/* push! r3, [r0] */
ra_offset = sp_offset;
ra_offset_p = 1;
}
else if (G_FLD (inst->v, 11, 7) == 0x4
&& fp_offset_p == 0)
{
/* push! r2, [r0] */
fp_offset = sp_offset;
fp_offset_p = 1;
}
}
else if (G_FLD (inst->v, 14, 12) == 0x2
&& G_FLD (inst->v, 3, 0) == 0xa)
{
/* pop! */
sp_offset -= 4;
}
else if (G_FLD (inst->v, 14, 7) == 0xc1
&& G_FLD (inst->v, 2, 0) == 0x0)
{
/* subei! r0, n */
sp_offset += (int) pow (2, G_FLD (inst->v, 6, 3));
}
else if (G_FLD (inst->v, 14, 7) == 0xc0
&& G_FLD (inst->v, 2, 0) == 0x0)
{
/* addei! r0, n */
sp_offset -= (int) pow (2, G_FLD (inst->v, 6, 3));
}
}
else
{
inst_len = SCORE_INSTLEN;
if (G_FLD(inst->v, 29, 25) == 0x3
&& G_FLD(inst->v, 2, 0) == 0x4
&& G_FLD(inst->v, 19, 15) == 0)
{
/* sw rD, [r0, offset]+ */
sp_offset += SCORE_INSTLEN;
if (G_FLD(inst->v, 24, 20) == 0x3)
{
/* rD = r3 */
if (ra_offset_p == 0)
{
ra_offset = sp_offset;
ra_offset_p = 1;
}
}
else if (G_FLD(inst->v, 24, 20) == 0x2)
{
/* rD = r2 */
if (fp_offset_p == 0)
{
fp_offset = sp_offset;
fp_offset_p = 1;
}
}
}
else if (G_FLD(inst->v, 29, 25) == 0x14
&& G_FLD(inst->v, 19,15) == 0)
{
/* sw rD, [r0, offset] */
if (G_FLD(inst->v, 24, 20) == 0x3)
{
/* rD = r3 */
ra_offset = sp_offset - G_FLD(inst->v, 14, 0);
ra_offset_p = 1;
}
else if (G_FLD(inst->v, 24, 20) == 0x2)
{
/* rD = r2 */
fp_offset = sp_offset - G_FLD(inst->v, 14, 0);
fp_offset_p = 1;