| /* Disassemble support for GDB. |
| |
| Copyright 2000, 2001, 2002, 2003 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "target.h" |
| #include "value.h" |
| #include "ui-out.h" |
| #include "gdb_string.h" |
| |
| #include "disasm.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; |
| }; |
| |
| /* This variable determines where memory used for disassembly is read from. */ |
| int gdb_disassemble_from_exec = -1; |
| |
| /* This is the memory_read_func for gdb_disassemble when we are |
| disassembling from the exec file. */ |
| static int |
| gdb_dis_asm_read_memory (bfd_vma memaddr, bfd_byte * myaddr, |
| unsigned int len, disassemble_info * info) |
| { |
| extern struct target_ops exec_ops; |
| int res; |
| |
| errno = 0; |
| res = xfer_memory (memaddr, myaddr, len, 0, 0, &exec_ops); |
| |
| if (res == len) |
| return 0; |
| else if (errno == 0) |
| return EIO; |
| else |
| return errno; |
| } |
| |
| 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; |
| |
| val = mle1->line - mle2->line; |
| |
| if (val != 0) |
| return val; |
| |
| return mle1->start_pc - mle2->start_pc; |
| } |
| |
| static int |
| dump_insns (struct ui_out *uiout, disassemble_info * di, |
| CORE_ADDR low, CORE_ADDR high, |
| int how_many, struct ui_stream *stb) |
| { |
| int num_displayed = 0; |
| CORE_ADDR pc; |
| |
| /* parts of the symbolic representation of the address */ |
| int unmapped; |
| char *filename = NULL; |
| char *name = NULL; |
| int offset; |
| int line; |
| struct cleanup *ui_out_chain; |
| |
| for (pc = low; pc < high;) |
| { |
| 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_field_core_addr (uiout, "address", pc); |
| |
| if (!build_address_symbolic (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, " <"); |
| ui_out_field_string (uiout, "func-name", name); |
| ui_out_text (uiout, "+"); |
| ui_out_field_int (uiout, "offset", offset); |
| ui_out_text (uiout, ">:\t"); |
| } |
| if (filename != NULL) |
| xfree (filename); |
| if (name != NULL) |
| xfree (name); |
| |
| ui_file_rewind (stb->stream); |
| pc += TARGET_PRINT_INSN (pc, di); |
| ui_out_field_stream (uiout, "inst", stb); |
| ui_file_rewind (stb->stream); |
| 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 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, struct ui_stream *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; |
| CORE_ADDR pc; |
| int num_displayed = 0; |
| struct cleanup *ui_out_chain; |
| |
| 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++) |
| { |
| struct cleanup *ui_out_tuple_chain = NULL; |
| struct cleanup *ui_out_list_chain = NULL; |
| int close_list = 1; |
| |
| /* 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"); |
| /* Don't close the list if the lines are not in order. */ |
| if (i < (newlines - 1) && mle[i + 1].line <= mle[i].line) |
| close_list = 0; |
| } |
| |
| num_displayed += dump_insns (uiout, di, mle[i].start_pc, mle[i].end_pc, |
| how_many, stb); |
| if (close_list) |
| { |
| do_cleanups (ui_out_list_chain); |
| do_cleanups (ui_out_tuple_chain); |
| ui_out_text (uiout, "\n"); |
| close_list = 0; |
| } |
| if (how_many >= 0) |
| if (num_displayed >= how_many) |
| break; |
| } |
| do_cleanups (ui_out_chain); |
| } |
| |
| |
| static void |
| do_assembly_only (struct ui_out *uiout, disassemble_info * di, |
| CORE_ADDR low, CORE_ADDR high, |
| int how_many, struct ui_stream *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 (uiout, di, low, high, how_many, stb); |
| |
| do_cleanups (ui_out_chain); |
| } |
| |
| void |
| gdb_disassembly (struct ui_out *uiout, |
| char *file_string, |
| int line_num, |
| int mixed_source_and_assembly, |
| int how_many, CORE_ADDR low, CORE_ADDR high) |
| { |
| static disassemble_info di; |
| static int di_initialized; |
| /* To collect the instruction outputted from opcodes. */ |
| static struct ui_stream *stb = NULL; |
| struct symtab *symtab = NULL; |
| struct linetable_entry *le = NULL; |
| int nlines = -1; |
| |
| if (!di_initialized) |
| { |
| /* We don't add a cleanup for this, because the allocation of |
| the stream is done once only for each gdb run, and we need to |
| keep it around until the end. Hopefully there won't be any |
| errors in the init code below, that make this function bail |
| out. */ |
| stb = ui_out_stream_new (uiout); |
| INIT_DISASSEMBLE_INFO_NO_ARCH (di, stb->stream, |
| (fprintf_ftype) fprintf_unfiltered); |
| di.flavour = bfd_target_unknown_flavour; |
| di.memory_error_func = dis_asm_memory_error; |
| di.print_address_func = dis_asm_print_address; |
| di_initialized = 1; |
| } |
| |
| di.mach = TARGET_PRINT_INSN_INFO->mach; |
| if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| di.endian = BFD_ENDIAN_BIG; |
| else |
| di.endian = BFD_ENDIAN_LITTLE; |
| |
| /* If gdb_disassemble_from_exec == -1, then we use the following heuristic to |
| determine whether or not to do disassembly from target memory or from the |
| exec file: |
| |
| If we're debugging a local process, read target memory, instead of the |
| exec file. This makes disassembly of functions in shared libs work |
| correctly. Also, read target memory if we are debugging native threads. |
| |
| Else, we're debugging a remote process, and should disassemble from the |
| exec file for speed. However, this is no good if the target modifies its |
| code (for relocation, or whatever). */ |
| |
| if (gdb_disassemble_from_exec == -1) |
| { |
| if (strcmp (target_shortname, "child") == 0 |
| || strcmp (target_shortname, "procfs") == 0 |
| || strcmp (target_shortname, "vxprocess") == 0 |
| || strstr (target_shortname, "-threads") != NULL) |
| gdb_disassemble_from_exec = 0; /* It's a child process, read inferior mem */ |
| else |
| gdb_disassemble_from_exec = 1; /* It's remote, read the exec file */ |
| } |
| |
| if (gdb_disassemble_from_exec) |
| di.read_memory_func = gdb_dis_asm_read_memory; |
| else |
| di.read_memory_func = dis_asm_read_memory; |
| |
| /* 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 (!mixed_source_and_assembly || nlines <= 0 |
| || symtab == NULL || symtab->linetable == NULL) |
| do_assembly_only (uiout, &di, low, high, how_many, stb); |
| |
| else if (mixed_source_and_assembly) |
| do_mixed_source_and_assembly (uiout, &di, nlines, le, low, |
| high, symtab, how_many, stb); |
| |
| gdb_flush (gdb_stdout); |
| } |