| /* Disassemble support for GDB. |
| |
| Copyright (C) 2000-2005, 2007-2012 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/>. */ |
| |
| #include "defs.h" |
| #include "target.h" |
| #include "value.h" |
| #include "ui-out.h" |
| #include "gdb_string.h" |
| #include "disasm.h" |
| #include "gdbcore.h" |
| #include "dis-asm.h" |
| |
| /* Disassemble functions. |
| FIXME: We should get rid of all the duplicate code in gdb that does |
| the same thing: disassemble_command() and the gdbtk variation. */ |
| |
| /* This Structure is used to store line number information. |
| We need a different sort of line table from the normal one cuz we can't |
| depend upon implicit line-end pc's for lines to do the |
| reordering in this function. */ |
| |
| struct dis_line_entry |
| { |
| int line; |
| CORE_ADDR start_pc; |
| CORE_ADDR end_pc; |
| }; |
| |
| /* Like target_read_memory, but slightly different parameters. */ |
| static int |
| dis_asm_read_memory (bfd_vma memaddr, gdb_byte *myaddr, unsigned int len, |
| struct disassemble_info *info) |
| { |
| return target_read_memory (memaddr, myaddr, len); |
| } |
| |
| /* Like memory_error with slightly different parameters. */ |
| static void |
| dis_asm_memory_error (int status, bfd_vma memaddr, |
| struct disassemble_info *info) |
| { |
| memory_error (status, memaddr); |
| } |
| |
| /* Like print_address with slightly different parameters. */ |
| static void |
| dis_asm_print_address (bfd_vma addr, struct disassemble_info *info) |
| { |
| struct gdbarch *gdbarch = info->application_data; |
| |
| print_address (gdbarch, addr, info->stream); |
| } |
| |
| static int |
| compare_lines (const void *mle1p, const void *mle2p) |
| { |
| struct dis_line_entry *mle1, *mle2; |
| int val; |
| |
| mle1 = (struct dis_line_entry *) mle1p; |
| mle2 = (struct dis_line_entry *) mle2p; |
| |
| /* End of sequence markers have a line number of 0 but don't want to |
| be sorted to the head of the list, instead sort by PC. */ |
| if (mle1->line == 0 || mle2->line == 0) |
| { |
| val = mle1->start_pc - mle2->start_pc; |
| if (val == 0) |
| val = mle1->line - mle2->line; |
| } |
| else |
| { |
| val = mle1->line - mle2->line; |
| if (val == 0) |
| val = mle1->start_pc - mle2->start_pc; |
| } |
| return val; |
| } |
| |
| static int |
| dump_insns (struct gdbarch *gdbarch, struct ui_out *uiout, |
| struct disassemble_info * di, |
| CORE_ADDR low, CORE_ADDR high, |
| int how_many, int flags, struct ui_file *stb) |
| { |
| int num_displayed = 0; |
| CORE_ADDR pc; |
| |
| /* parts of the symbolic representation of the address */ |
| int unmapped; |
| int offset; |
| int line; |
| struct cleanup *ui_out_chain; |
| |
| for (pc = low; pc < high;) |
| { |
| char *filename = NULL; |
| char *name = NULL; |
| |
| QUIT; |
| if (how_many >= 0) |
| { |
| if (num_displayed >= how_many) |
| break; |
| else |
| num_displayed++; |
| } |
| ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL); |
| ui_out_text (uiout, pc_prefix (pc)); |
| ui_out_field_core_addr (uiout, "address", gdbarch, pc); |
| |
| if (!build_address_symbolic (gdbarch, pc, 0, &name, &offset, &filename, |
| &line, &unmapped)) |
| { |
| /* We don't care now about line, filename and |
| unmapped. But we might in the future. */ |
| ui_out_text (uiout, " <"); |
| if ((flags & DISASSEMBLY_OMIT_FNAME) == 0) |
| ui_out_field_string (uiout, "func-name", name); |
| ui_out_text (uiout, "+"); |
| ui_out_field_int (uiout, "offset", offset); |
| ui_out_text (uiout, ">:\t"); |
| } |
| else |
| ui_out_text (uiout, ":\t"); |
| |
| if (filename != NULL) |
| xfree (filename); |
| if (name != NULL) |
| xfree (name); |
| |
| ui_file_rewind (stb); |
| if (flags & DISASSEMBLY_RAW_INSN) |
| { |
| CORE_ADDR old_pc = pc; |
| bfd_byte data; |
| int status; |
| const char *spacer = ""; |
| |
| /* Build the opcodes using a temporary stream so we can |
| write them out in a single go for the MI. */ |
| struct ui_file *opcode_stream = mem_fileopen (); |
| struct cleanup *cleanups = |
| make_cleanup_ui_file_delete (opcode_stream); |
| |
| pc += gdbarch_print_insn (gdbarch, pc, di); |
| for (;old_pc < pc; old_pc++) |
| { |
| status = (*di->read_memory_func) (old_pc, &data, 1, di); |
| if (status != 0) |
| (*di->memory_error_func) (status, old_pc, di); |
| fprintf_filtered (opcode_stream, "%s%02x", |
| spacer, (unsigned) data); |
| spacer = " "; |
| } |
| ui_out_field_stream (uiout, "opcodes", opcode_stream); |
| ui_out_text (uiout, "\t"); |
| |
| do_cleanups (cleanups); |
| } |
| else |
| pc += gdbarch_print_insn (gdbarch, pc, di); |
| ui_out_field_stream (uiout, "inst", stb); |
| ui_file_rewind (stb); |
| do_cleanups (ui_out_chain); |
| ui_out_text (uiout, "\n"); |
| } |
| return num_displayed; |
| } |
| |
| /* The idea here is to present a source-O-centric view of a |
| function to the user. This means that things are presented |
| in source order, with (possibly) out of order assembly |
| immediately following. */ |
| |
| static void |
| do_mixed_source_and_assembly (struct gdbarch *gdbarch, struct ui_out *uiout, |
| struct disassemble_info *di, int nlines, |
| struct linetable_entry *le, |
| CORE_ADDR low, CORE_ADDR high, |
| struct symtab *symtab, |
| int how_many, int flags, struct ui_file *stb) |
| { |
| int newlines = 0; |
| struct dis_line_entry *mle; |
| struct symtab_and_line sal; |
| int i; |
| int out_of_order = 0; |
| int next_line = 0; |
| int num_displayed = 0; |
| struct cleanup *ui_out_chain; |
| struct cleanup *ui_out_tuple_chain = make_cleanup (null_cleanup, 0); |
| struct cleanup *ui_out_list_chain = make_cleanup (null_cleanup, 0); |
| |
| mle = (struct dis_line_entry *) alloca (nlines |
| * sizeof (struct dis_line_entry)); |
| |
| /* Copy linetable entries for this function into our data |
| structure, creating end_pc's and setting out_of_order as |
| appropriate. */ |
| |
| /* First, skip all the preceding functions. */ |
| |
| for (i = 0; i < nlines - 1 && le[i].pc < low; i++); |
| |
| /* Now, copy all entries before the end of this function. */ |
| |
| for (; i < nlines - 1 && le[i].pc < high; i++) |
| { |
| if (le[i].line == le[i + 1].line && le[i].pc == le[i + 1].pc) |
| continue; /* Ignore duplicates. */ |
| |
| /* Skip any end-of-function markers. */ |
| if (le[i].line == 0) |
| continue; |
| |
| mle[newlines].line = le[i].line; |
| if (le[i].line > le[i + 1].line) |
| out_of_order = 1; |
| mle[newlines].start_pc = le[i].pc; |
| mle[newlines].end_pc = le[i + 1].pc; |
| newlines++; |
| } |
| |
| /* If we're on the last line, and it's part of the function, |
| then we need to get the end pc in a special way. */ |
| |
| if (i == nlines - 1 && le[i].pc < high) |
| { |
| mle[newlines].line = le[i].line; |
| mle[newlines].start_pc = le[i].pc; |
| sal = find_pc_line (le[i].pc, 0); |
| mle[newlines].end_pc = sal.end; |
| newlines++; |
| } |
| |
| /* Now, sort mle by line #s (and, then by addresses within |
| lines). */ |
| |
| if (out_of_order) |
| qsort (mle, newlines, sizeof (struct dis_line_entry), compare_lines); |
| |
| /* Now, for each line entry, emit the specified lines (unless |
| they have been emitted before), followed by the assembly code |
| for that line. */ |
| |
| ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns"); |
| |
| for (i = 0; i < newlines; i++) |
| { |
| /* Print out everything from next_line to the current line. */ |
| if (mle[i].line >= next_line) |
| { |
| if (next_line != 0) |
| { |
| /* Just one line to print. */ |
| if (next_line == mle[i].line) |
| { |
| ui_out_tuple_chain |
| = make_cleanup_ui_out_tuple_begin_end (uiout, |
| "src_and_asm_line"); |
| print_source_lines (symtab, next_line, mle[i].line + 1, 0); |
| } |
| else |
| { |
| /* Several source lines w/o asm instructions associated. */ |
| for (; next_line < mle[i].line; next_line++) |
| { |
| struct cleanup *ui_out_list_chain_line; |
| struct cleanup *ui_out_tuple_chain_line; |
| |
| ui_out_tuple_chain_line |
| = make_cleanup_ui_out_tuple_begin_end (uiout, |
| "src_and_asm_line"); |
| print_source_lines (symtab, next_line, next_line + 1, |
| 0); |
| ui_out_list_chain_line |
| = make_cleanup_ui_out_list_begin_end (uiout, |
| "line_asm_insn"); |
| do_cleanups (ui_out_list_chain_line); |
| do_cleanups (ui_out_tuple_chain_line); |
| } |
| /* Print the last line and leave list open for |
| asm instructions to be added. */ |
| ui_out_tuple_chain |
| = make_cleanup_ui_out_tuple_begin_end (uiout, |
| "src_and_asm_line"); |
| print_source_lines (symtab, next_line, mle[i].line + 1, 0); |
| } |
| } |
| else |
| { |
| ui_out_tuple_chain |
| = make_cleanup_ui_out_tuple_begin_end (uiout, |
| "src_and_asm_line"); |
| print_source_lines (symtab, mle[i].line, mle[i].line + 1, 0); |
| } |
| |
| next_line = mle[i].line + 1; |
| ui_out_list_chain |
| = make_cleanup_ui_out_list_begin_end (uiout, "line_asm_insn"); |
| } |
| |
| num_displayed += dump_insns (gdbarch, uiout, di, |
| mle[i].start_pc, mle[i].end_pc, |
| how_many, flags, stb); |
| |
| /* When we've reached the end of the mle array, or we've seen the last |
| assembly range for this source line, close out the list/tuple. */ |
| if (i == (newlines - 1) || mle[i + 1].line > mle[i].line) |
| { |
| do_cleanups (ui_out_list_chain); |
| do_cleanups (ui_out_tuple_chain); |
| ui_out_tuple_chain = make_cleanup (null_cleanup, 0); |
| ui_out_list_chain = make_cleanup (null_cleanup, 0); |
| ui_out_text (uiout, "\n"); |
| } |
| if (how_many >= 0 && num_displayed >= how_many) |
| break; |
| } |
| do_cleanups (ui_out_chain); |
| } |
| |
| |
| static void |
| do_assembly_only (struct gdbarch *gdbarch, struct ui_out *uiout, |
| struct disassemble_info * di, |
| CORE_ADDR low, CORE_ADDR high, |
| int how_many, int flags, struct ui_file *stb) |
| { |
| int num_displayed = 0; |
| struct cleanup *ui_out_chain; |
| |
| ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns"); |
| |
| num_displayed = dump_insns (gdbarch, uiout, di, low, high, how_many, |
| flags, stb); |
| |
| do_cleanups (ui_out_chain); |
| } |
| |
| /* Initialize the disassemble info struct ready for the specified |
| stream. */ |
| |
| static int ATTRIBUTE_PRINTF (2, 3) |
| fprintf_disasm (void *stream, const char *format, ...) |
| { |
| va_list args; |
| |
| va_start (args, format); |
| vfprintf_filtered (stream, format, args); |
| va_end (args); |
| /* Something non -ve. */ |
| return 0; |
| } |
| |
| static struct disassemble_info |
| gdb_disassemble_info (struct gdbarch *gdbarch, struct ui_file *file) |
| { |
| struct disassemble_info di; |
| |
| init_disassemble_info (&di, file, fprintf_disasm); |
| di.flavour = bfd_target_unknown_flavour; |
| di.memory_error_func = dis_asm_memory_error; |
| di.print_address_func = dis_asm_print_address; |
| /* NOTE: cagney/2003-04-28: The original code, from the old Insight |
| disassembler had a local optomization here. By default it would |
| access the executable file, instead of the target memory (there |
| was a growing list of exceptions though). Unfortunately, the |
| heuristic was flawed. Commands like "disassemble &variable" |
| didn't work as they relied on the access going to the target. |
| Further, it has been supperseeded by trust-read-only-sections |
| (although that should be superseeded by target_trust..._p()). */ |
| di.read_memory_func = dis_asm_read_memory; |
| di.arch = gdbarch_bfd_arch_info (gdbarch)->arch; |
| di.mach = gdbarch_bfd_arch_info (gdbarch)->mach; |
| di.endian = gdbarch_byte_order (gdbarch); |
| di.endian_code = gdbarch_byte_order_for_code (gdbarch); |
| di.application_data = gdbarch; |
| disassemble_init_for_target (&di); |
| return di; |
| } |
| |
| void |
| gdb_disassembly (struct gdbarch *gdbarch, struct ui_out *uiout, |
| char *file_string, int flags, int how_many, |
| CORE_ADDR low, CORE_ADDR high) |
| { |
| struct ui_file *stb = mem_fileopen (); |
| struct cleanup *cleanups = make_cleanup_ui_file_delete (stb); |
| struct disassemble_info di = gdb_disassemble_info (gdbarch, stb); |
| /* To collect the instruction outputted from opcodes. */ |
| struct symtab *symtab = NULL; |
| struct linetable_entry *le = NULL; |
| int nlines = -1; |
| |
| /* Assume symtab is valid for whole PC range. */ |
| symtab = find_pc_symtab (low); |
| |
| if (symtab != NULL && symtab->linetable != NULL) |
| { |
| /* Convert the linetable to a bunch of my_line_entry's. */ |
| le = symtab->linetable->item; |
| nlines = symtab->linetable->nitems; |
| } |
| |
| if (!(flags & DISASSEMBLY_SOURCE) || nlines <= 0 |
| || symtab == NULL || symtab->linetable == NULL) |
| do_assembly_only (gdbarch, uiout, &di, low, high, how_many, flags, stb); |
| |
| else if (flags & DISASSEMBLY_SOURCE) |
| do_mixed_source_and_assembly (gdbarch, uiout, &di, nlines, le, low, |
| high, symtab, how_many, flags, stb); |
| |
| do_cleanups (cleanups); |
| gdb_flush (gdb_stdout); |
| } |
| |
| /* Print the instruction at address MEMADDR in debugged memory, |
| on STREAM. Returns the length of the instruction, in bytes, |
| and, if requested, the number of branch delay slot instructions. */ |
| |
| int |
| gdb_print_insn (struct gdbarch *gdbarch, CORE_ADDR memaddr, |
| struct ui_file *stream, int *branch_delay_insns) |
| { |
| struct disassemble_info di; |
| int length; |
| |
| di = gdb_disassemble_info (gdbarch, stream); |
| length = gdbarch_print_insn (gdbarch, memaddr, &di); |
| if (branch_delay_insns) |
| { |
| if (di.insn_info_valid) |
| *branch_delay_insns = di.branch_delay_insns; |
| else |
| *branch_delay_insns = 0; |
| } |
| return length; |
| } |
| |
| static void |
| do_ui_file_delete (void *arg) |
| { |
| ui_file_delete (arg); |
| } |
| |
| /* Return the length in bytes of the instruction at address MEMADDR in |
| debugged memory. */ |
| |
| int |
| gdb_insn_length (struct gdbarch *gdbarch, CORE_ADDR addr) |
| { |
| static struct ui_file *null_stream = NULL; |
| |
| /* Dummy file descriptor for the disassembler. */ |
| if (!null_stream) |
| { |
| null_stream = ui_file_new (); |
| make_final_cleanup (do_ui_file_delete, null_stream); |
| } |
| |
| return gdb_print_insn (gdbarch, addr, null_stream, NULL); |
| } |
| |
| /* fprintf-function for gdb_buffered_insn_length. This function is a |
| nop, we don't want to print anything, we just want to compute the |
| length of the insn. */ |
| |
| static int ATTRIBUTE_PRINTF (2, 3) |
| gdb_buffered_insn_length_fprintf (void *stream, const char *format, ...) |
| { |
| return 0; |
| } |
| |
| /* Initialize a struct disassemble_info for gdb_buffered_insn_length. */ |
| |
| static void |
| gdb_buffered_insn_length_init_dis (struct gdbarch *gdbarch, |
| struct disassemble_info *di, |
| const gdb_byte *insn, int max_len, |
| CORE_ADDR addr) |
| { |
| init_disassemble_info (di, NULL, gdb_buffered_insn_length_fprintf); |
| |
| /* init_disassemble_info installs buffer_read_memory, etc. |
| so we don't need to do that here. |
| The cast is necessary until disassemble_info is const-ified. */ |
| di->buffer = (gdb_byte *) insn; |
| di->buffer_length = max_len; |
| di->buffer_vma = addr; |
| |
| di->arch = gdbarch_bfd_arch_info (gdbarch)->arch; |
| di->mach = gdbarch_bfd_arch_info (gdbarch)->mach; |
| di->endian = gdbarch_byte_order (gdbarch); |
| di->endian_code = gdbarch_byte_order_for_code (gdbarch); |
| |
| disassemble_init_for_target (di); |
| } |
| |
| /* Return the length in bytes of INSN. MAX_LEN is the size of the |
| buffer containing INSN. */ |
| |
| int |
| gdb_buffered_insn_length (struct gdbarch *gdbarch, |
| const gdb_byte *insn, int max_len, CORE_ADDR addr) |
| { |
| struct disassemble_info di; |
| |
| gdb_buffered_insn_length_init_dis (gdbarch, &di, insn, max_len, addr); |
| |
| return gdbarch_print_insn (gdbarch, addr, &di); |
| } |