darlinghq/darling-gdb
1
0
Fork 0
mirror of https://github.com/darlinghq/darling-gdb.git synced 2024-12-03 17:51:57 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
8d00578918
darling-gdb/gdb/score-tdep.c
Joel Brobecker a9762ec78a Switch the license of all .c files to GPLv3. 
Switch the license of all .h files to GPLv3.
        Switch the license of all .cc files to GPLv3.
2007-08-23 18:08:50 +00:00

1083 lines
31 KiB
C
Raw Blame History

/* Target-dependent code for the S+core architecture, for GDB,
the GNU Debugger.
Copyright (C) 2006, 2007 Free Software Foundation, Inc.
Contributed by Qinwei (qinwei@sunnorth.com.cn)
Contributed by Ching-Peng Lin (cplin@sunplus.com)
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 "gdb_assert.h"
#include "inferior.h"
#include "symtab.h"
#include "objfiles.h"
#include "gdbcore.h"
#include "target.h"
#include "arch-utils.h"
#include "regcache.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) (((_i) << (31 - (_ms))) >> (31 - (_ms) + (_ls)))
#define RM_PBITS(_raw) ((G_FLD(_raw, 31, 16) << 15) | G_FLD(_raw, 14, 0))
typedef struct{
unsigned int v;
unsigned int raw;
char is15;
}inst_t;
struct score_frame_cache
{
CORE_ADDR base;
CORE_ADDR fp;
struct trad_frame_saved_reg *saved_regs;
};
#if 0
/* If S+core GCC will generate these instructions in the prologue:
lw rx, imm1
addi rx, -imm2
mv! r2, rx
then .pdr section is used. */
#define P_SIZE 8
#define PI_SYM 0
#define PI_R_MSK 1
#define PI_R_OFF 2
#define PI_R_LEF 4
#define PI_F_OFF 5
#define PI_F_REG 6
#define PI_RAREG 7
typedef struct frame_extra_info
{
CORE_ADDR p_frame;
unsigned int pdr[P_SIZE];
} extra_info_t;
struct obj_priv
{
bfd_size_type size;
char *contents;
};
static bfd *the_bfd;
static int
score_compare_pdr_entries (const void *a, const void *b)
{
CORE_ADDR lhs = bfd_get_32 (the_bfd, (bfd_byte *) a);
CORE_ADDR rhs = bfd_get_32 (the_bfd, (bfd_byte *) b);
if (lhs < rhs)
return -1;
else if (lhs == rhs)
return 0;
else
return 1;
}
static void
score_analyze_pdr_section (CORE_ADDR startaddr, CORE_ADDR pc,
struct frame_info *next_frame,
struct score_frame_cache *this_cache)
{
struct symbol *sym;
struct obj_section *sec;
extra_info_t *fci_ext;
CORE_ADDR leaf_ra_stack_addr = -1;
gdb_assert (startaddr <= pc);
gdb_assert (this_cache != NULL);
fci_ext = frame_obstack_zalloc (sizeof (extra_info_t));
if ((sec = find_pc_section (pc)) == NULL)
{
error ("Error: Can't find section in file:%s, line:%d!",
__FILE__, __LINE__);
return;
}
/* Anylyze .pdr section and get coresponding fields. */
{
static struct obj_priv *priv = NULL;
if (priv == NULL)
{
asection *bfdsec;
priv = obstack_alloc (&sec->objfile->objfile_obstack,
sizeof (struct obj_priv));
if ((bfdsec = bfd_get_section_by_name (sec->objfile->obfd, ".pdr")))
{
priv->size = bfd_section_size (sec->objfile->obfd, bfdsec);
priv->contents = obstack_alloc (&sec->objfile->objfile_obstack,
priv->size);
bfd_get_section_contents (sec->objfile->obfd, bfdsec,
priv->contents, 0, priv->size);
the_bfd = sec->objfile->obfd;
qsort (priv->contents, priv->size / 32, 32,
score_compare_pdr_entries);
the_bfd = NULL;
}
else
priv->size = 0;
}
if (priv->size != 0)
{
int low = 0, mid, high = priv->size / 32;
char *ptr;
do
{
CORE_ADDR pdr_pc;
mid = (low + high) / 2;
ptr = priv->contents + mid * 32;
pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr);
pdr_pc += ANOFFSET (sec->objfile->section_offsets,
SECT_OFF_TEXT (sec->objfile));
if (pdr_pc == startaddr)
break;
if (pdr_pc > startaddr)
high = mid;
else
low = mid + 1;
}
while (low != high);
if (low != high)
{
gdb_assert (bfd_get_32 (sec->objfile->obfd, ptr) == startaddr);
#define EXT_PDR(_pi) bfd_get_32(sec->objfile->obfd, ptr+((_pi)<<2))
fci_ext->pdr[PI_SYM] = EXT_PDR (PI_SYM);
fci_ext->pdr[PI_R_MSK] = EXT_PDR (PI_R_MSK);
fci_ext->pdr[PI_R_OFF] = EXT_PDR (PI_R_OFF);
fci_ext->pdr[PI_R_LEF] = EXT_PDR (PI_R_LEF);
fci_ext->pdr[PI_F_OFF] = EXT_PDR (PI_F_OFF);
fci_ext->pdr[PI_F_REG] = EXT_PDR (PI_F_REG);
fci_ext->pdr[PI_RAREG] = EXT_PDR (PI_RAREG);
#undef EXT_PDR
}
}
}
}
#endif
#if 0
/* Open these functions if build with simulator. */
int
score_target_can_use_watch (int type, int cnt, int othertype)
{
if (strcmp (current_target.to_shortname, "sim") == 0)
{
return soc_gh_can_use_watch (type, cnt);
}
else
{
return (*current_target.to_can_use_hw_breakpoint) (type, cnt, othertype);
}
}
int
score_stopped_by_watch (void)
{
if (strcmp (current_target.to_shortname, "sim") == 0)
{
return soc_gh_stopped_by_watch ();
}
else
{
return (*current_target.to_stopped_by_watchpoint) ();
}
}
int
score_target_insert_watchpoint (CORE_ADDR addr, int len, int type)
{
if (strcmp (current_target.to_shortname, "sim") == 0)
{
return soc_gh_add_watch (addr, len, type);
}
else
{
return (*current_target.to_insert_watchpoint) (addr, len, type);
}
}
int
score_target_remove_watchpoint (CORE_ADDR addr, int len, int type)
{
if (strcmp (current_target.to_shortname, "sim") == 0)
{
return soc_gh_del_watch (addr, len, type);
}
else
{
return (*current_target.to_remove_watchpoint) (addr, len, type);
}
}
int
score_target_insert_hw_breakpoint (struct bp_target_info * bp_tgt)
{
if (strcmp (current_target.to_shortname, "sim") == 0)
{
return soc_gh_add_hardbp (bp_tgt->placed_address);
}
else
{
return (*current_target.to_insert_hw_breakpoint) (bp_tgt);
}
}
int
score_target_remove_hw_breakpoint (struct bp_target_info * bp_tgt)
{
if (strcmp (current_target.to_shortname, "sim") == 0)
{
return soc_gh_del_hardbp (bp_tgt->placed_address);
}
else
{
return (*current_target.to_remove_hw_breakpoint) (bp_tgt);
}
}
#endif
static struct type *
score_register_type (struct gdbarch *gdbarch, int regnum)
{
gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS);
return builtin_type_uint32;
}
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 CORE_ADDR
score_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM);
}
static const char *
score_register_name (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 < SCORE_NUM_REGS);
return score_register_names[regnum];
}
static int
score_register_sim_regno (int regnum)
{
gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS);
return regnum;
}
static int
score_print_insn (bfd_vma memaddr, struct disassemble_info *info)
{
if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
return print_insn_big_score (memaddr, info);
else
return print_insn_little_score (memaddr, info);
}
static const gdb_byte *
score_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
{
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);
if (gdbarch_byte_order (current_gdbarch) == 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 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 < SCORE_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 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 (current_gdbarch),
readbuf, writebuf, offset);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
}
static struct frame_id
score_unwind_dummy_id (struct gdbarch *gdbarch,
struct frame_info *next_frame)
{
return frame_id_build (
frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM),
frame_pc_unwind (next_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)
{
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 (current_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);
/* The last part of a arg should shift left when
gdbarch_byte_order is BFD_ENDIAN_BIG. */
if (gdbarch_byte_order (current_gdbarch) == 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 char *
score_malloc_and_get_memblock (CORE_ADDR addr, CORE_ADDR size)
{
int ret;
char *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 = (char *) 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
score_free_memblock (char *memblock)
{
xfree (memblock);
}
static void
score_adjust_memblock_ptr (char **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 inst_t *
score_fetch_inst (CORE_ADDR addr, char *memblock)
{
static inst_t inst = { 0, 0 };
char 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);
inst.is15 = !(inst.raw & 0x80008000);
inst.v = RM_PBITS (inst.raw);
big = (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG);
if (inst.is15)
{
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 CORE_ADDR
score_skip_prologue (CORE_ADDR pc)
{
CORE_ADDR cpc = pc;
int iscan = 32, stack_sub = 0;
while (iscan-- > 0)
{
inst_t *inst = score_fetch_inst (cpc, NULL);
if (!inst)
break;
if (!inst->is15 && !stack_sub
&& (G_FLD (inst->v, 29, 25) == 0x1
&& G_FLD (inst->v, 24, 20) == 0x0))
{
/* addi r0, offset */
pc = stack_sub = cpc + SCORE_INSTLEN;
}
else if (!inst->is15
&& inst->v == RM_PBITS (0x8040bc56))
{
/* mv r2, r0 */
pc = cpc + SCORE_INSTLEN;
break;
}
else if (inst->is15
&& inst->v == RM_PBITS (0x0203))
{
/* mv! r2, r0 */
pc = cpc + SCORE16_INSTLEN;
break;
}
else if (inst->is15
&& ((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->is15
&& ((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->is15 ? SCORE16_INSTLEN : SCORE_INSTLEN;
}
return pc;
}
static int
score_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR cur_pc)
{
inst_t *inst = score_fetch_inst (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;
}
static void
score_analyze_prologue (CORE_ADDR startaddr, CORE_ADDR pc,
struct frame_info *next_frame,
struct score_frame_cache *this_cache)
{
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;
char *memblock = NULL;
char *memblock_ptr = NULL;
CORE_ADDR prev_pc = -1;
/* Allocate MEMBLOCK if PC - STARTADDR > 0. */
memblock_ptr = memblock =
score_malloc_and_get_memblock (startaddr, pc - startaddr);
sp = frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM);
fp = frame_unwind_register_unsigned (next_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. */
score_adjust_memblock_ptr (&memblock, prev_pc, cur_pc);
inst = score_fetch_inst (cur_pc, memblock);
}
else
{
/* Otherwise, we fetch 4 bytes from target, and GDB also
work correctly. */
inst = score_fetch_inst (cur_pc, NULL);
}
if (inst->is15 == 1)
{
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, 15) == 0xc60
&& G_FLD (inst->v, 2, 0) == 0x4)
{
/* sw r3, [r0, offset]+ */
sp_offset += SCORE_INSTLEN;
if (ra_offset_p == 0)
{
ra_offset = sp_offset;
ra_offset_p = 1;
}
}
if (G_FLD (inst->v, 29, 15) == 0xc40
&& G_FLD (inst->v, 2, 0) == 0x4)
{
/* sw r2, [r0, offset]+ */
sp_offset += SCORE_INSTLEN;
if (fp_offset_p == 0)
{
fp_offset = sp_offset;
fp_offset_p = 1;
}
}
else if (G_FLD (inst->v, 29, 15) == 0x1c60
&& G_FLD (inst->v, 2, 0) == 0x0)
{
/* lw r3, [r0]+, 4 */
sp_offset -= SCORE_INSTLEN;
ra_offset_p = 1;
}
else if (G_FLD (inst->v, 29, 15) == 0x1c40
&& G_FLD (inst->v, 2, 0) == 0x0)
{
/* lw r2, [r0]+, 4 */
sp_offset -= SCORE_INSTLEN;
fp_offset_p = 1;
}
else if (G_FLD (inst->v, 29, 17) == 0x100
&& G_FLD (inst->v, 0, 0) == 0x0)
{
/* addi r0, -offset */
sp_offset += 65536 - G_FLD (inst->v, 16, 1);
}
else if (G_FLD (inst->v, 29, 17) == 0x110
&& G_FLD (inst->v, 0, 0) == 0x0)
{
/* addi r2, offset */
if (pc - cur_pc > 4)
{
unsigned int save_v = inst->v;
inst_t *inst2 =
score_fetch_inst (cur_pc + SCORE_INSTLEN, NULL);
if (inst2->v == 0x23)
{
/* mv! r0, r2 */
sp_offset -= G_FLD (save_v, 16, 1);
}
}
}
}
}
/* Save RA. */
if (ra_offset_p == 1)
{
if (this_cache->saved_regs[SCORE_PC_REGNUM].addr == -1)
this_cache->saved_regs[SCORE_PC_REGNUM].addr =
sp + sp_offset - ra_offset;
}
else
{
this_cache->saved_regs[SCORE_PC_REGNUM] =
this_cache->saved_regs[SCORE_RA_REGNUM];
}
/* Save FP. */
if (fp_offset_p == 1)
{
if (this_cache->saved_regs[SCORE_FP_REGNUM].addr == -1)
this_cache->saved_regs[SCORE_FP_REGNUM].addr =
sp + sp_offset - fp_offset;
}
/* Save SP and FP. */
this_cache->base = sp + sp_offset;
this_cache->fp = fp;
/* Don't forget to free MEMBLOCK if we allocated it. */
if (memblock_ptr != NULL)
score_free_memblock (memblock_ptr);
}
static struct score_frame_cache *
score_make_prologue_cache (struct frame_info *next_frame, void **this_cache)
{
struct score_frame_cache *cache;
if ((*this_cache) != NULL)
return (*this_cache);
cache = FRAME_OBSTACK_ZALLOC (struct score_frame_cache);
(*this_cache) = cache;
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
/* Analyze the prologue. */
{
const CORE_ADDR pc = frame_pc_unwind (next_frame);
CORE_ADDR start_addr;
find_pc_partial_function (pc, NULL, &start_addr, NULL);
if (start_addr == 0)
return cache;
score_analyze_prologue (start_addr, pc, next_frame, *this_cache);
}
/* Save SP. */
trad_frame_set_value (cache->saved_regs, SCORE_SP_REGNUM, cache->base);
return (*this_cache);
}
static void
score_prologue_this_id (struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct score_frame_cache *info = score_make_prologue_cache (next_frame,
this_cache);
(*this_id) = frame_id_build (info->base,
frame_func_unwind (next_frame, NORMAL_FRAME));
}
static void
score_prologue_prev_register (struct frame_info *next_frame,
void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR * addrp,
int *realnump, gdb_byte * valuep)
{
struct score_frame_cache *info = score_make_prologue_cache (next_frame,
this_cache);
trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind score_prologue_unwind =
{
NORMAL_FRAME,
score_prologue_this_id,
score_prologue_prev_register
};
static const struct frame_unwind *
score_prologue_sniffer (struct frame_info *next_frame)
{
return &score_prologue_unwind;
}
static CORE_ADDR
score_prologue_frame_base_address (struct frame_info *next_frame,
void **this_cache)
{
struct score_frame_cache *info =
score_make_prologue_cache (next_frame, this_cache);
return info->fp;
}
static const struct frame_base score_prologue_frame_base =
{
&score_prologue_unwind,
score_prologue_frame_base_address,
score_prologue_frame_base_address,
score_prologue_frame_base_address,
};
static const struct frame_base *
score_prologue_frame_base_sniffer (struct frame_info *next_frame)
{
return &score_prologue_frame_base;
}
static struct gdbarch *
score_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch *gdbarch;
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
{
return (arches->gdbarch);
}
gdbarch = gdbarch_alloc (&info, 0);
set_gdbarch_short_bit (gdbarch, 16);
set_gdbarch_int_bit (gdbarch, 32);
set_gdbarch_float_bit (gdbarch, 32);
set_gdbarch_double_bit (gdbarch, 64);
set_gdbarch_long_double_bit (gdbarch, 64);
set_gdbarch_register_sim_regno (gdbarch, score_register_sim_regno);
set_gdbarch_pc_regnum (gdbarch, SCORE_PC_REGNUM);
set_gdbarch_sp_regnum (gdbarch, SCORE_SP_REGNUM);
set_gdbarch_num_regs (gdbarch, SCORE_NUM_REGS);
set_gdbarch_register_name (gdbarch, score_register_name);
set_gdbarch_breakpoint_from_pc (gdbarch, score_breakpoint_from_pc);
set_gdbarch_register_type (gdbarch, score_register_type);
set_gdbarch_frame_align (gdbarch, score_frame_align);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_unwind_pc (gdbarch, score_unwind_pc);
set_gdbarch_unwind_sp (gdbarch, score_unwind_sp);
set_gdbarch_print_insn (gdbarch, score_print_insn);
set_gdbarch_skip_prologue (gdbarch, score_skip_prologue);
set_gdbarch_in_function_epilogue_p (gdbarch, score_in_function_epilogue_p);
/* Watchpoint hooks. */
set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1);
/* Dummy frame hooks. */
set_gdbarch_return_value (gdbarch, score_return_value);
set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
set_gdbarch_unwind_dummy_id (gdbarch, score_unwind_dummy_id);
set_gdbarch_push_dummy_call (gdbarch, score_push_dummy_call);
/* Normal frame hooks. */
frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
frame_unwind_append_sniffer (gdbarch, score_prologue_sniffer);
frame_base_append_sniffer (gdbarch, score_prologue_frame_base_sniffer);
return gdbarch;
}
extern initialize_file_ftype _initialize_score_tdep;
void
_initialize_score_tdep (void)
{
gdbarch_register (bfd_arch_score, score_gdbarch_init, NULL);
}
Reference in New Issue View Git Blame Copy Permalink