| /* Target-dependent code for the S+core architecture, for GDB, |
| the GNU Debugger. |
| |
| Copyright (C) 2006, 2007, 2008 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 *this_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 (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 < SCORE_NUM_REGS); |
| return score_register_names[regnum]; |
| } |
| |
| static int |
| score_register_sim_regno (struct gdbarch *gdbarch, 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 (info->endian == 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 (struct gdbarch *gdbarch, 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 (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 *func_type, |
| 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) |
| { |
| 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); |
| |
| /* The last part of a arg should shift left when |
| gdbarch_byte_order is BFD_ENDIAN_BIG. */ |
| if (gdbarch_byte_order (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 (struct gdbarch *gdbarch, 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 (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 (struct gdbarch *gdbarch, CORE_ADDR pc) |
| { |
| CORE_ADDR cpc = pc; |
| int iscan = 32, stack_sub = 0; |
| while (iscan-- > 0) |
| { |
| inst_t *inst = score_fetch_inst (gdbarch, 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 (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; |
| } |
| |
| static void |
| score_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; |
| |
| 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 = 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. */ |
| score_adjust_memblock_ptr (&memblock, prev_pc, cur_pc); |
| inst = score_fetch_inst (gdbarch, cur_pc, memblock); |
| } |
| else |
| { |
| /* Otherwise, we fetch 4 bytes from target, and GDB also |
| work correctly. */ |
| inst = score_fetch_inst (gdbarch, 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 (gdbarch, 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 *this_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 (this_frame); |
| |
| /* Analyze the prologue. */ |
| { |
| const CORE_ADDR pc = get_frame_pc (this_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, this_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 *this_frame, void **this_cache, |
| struct frame_id *this_id) |
| { |
| struct score_frame_cache *info = score_make_prologue_cache (this_frame, |
| this_cache); |
| (*this_id) = frame_id_build (info->base, get_frame_func (this_frame)); |
| } |
| |
| static struct value * |
| score_prologue_prev_register (struct frame_info *this_frame, |
| void **this_cache, int regnum) |
| { |
| struct score_frame_cache *info = score_make_prologue_cache (this_frame, |
| this_cache); |
| return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum); |
| } |
| |
| static const struct frame_unwind score_prologue_unwind = |
| { |
| NORMAL_FRAME, |
| score_prologue_this_id, |
| score_prologue_prev_register, |
| NULL, |
| default_frame_sniffer |
| }; |
| |
| static CORE_ADDR |
| score_prologue_frame_base_address (struct frame_info *this_frame, |
| void **this_cache) |
| { |
| struct score_frame_cache *info = |
| score_make_prologue_cache (this_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 *this_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_dummy_id (gdbarch, score_dummy_id); |
| set_gdbarch_push_dummy_call (gdbarch, score_push_dummy_call); |
| |
| /* Normal frame hooks. */ |
| dwarf2_append_unwinders (gdbarch); |
| frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer); |
| frame_unwind_append_unwinder (gdbarch, &score_prologue_unwind); |
| 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); |
| } |
