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Diffstat (limited to 'gdb/disasm.c')
| -rw-r--r-- | gdb/disasm.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/gdb/disasm.c b/gdb/disasm.c new file mode 100644 index 0000000..8ce9a15 --- /dev/null +++ b/gdb/disasm.c @@ -0,0 +1,374 @@ +/* Disassemble support for GDB. + Copyright 2000, 2001, 2002 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 PTR mle1p, const PTR 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; + + for (pc = low; pc < high;) + { + QUIT; + if (how_many >= 0) + { + if (num_displayed >= how_many) + break; + else + num_displayed++; + } + ui_out_tuple_begin (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); + ui_out_tuple_end (uiout); + 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; + + 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_list_begin (uiout, "asm_insns"); + + for (i = 0; i < newlines; i++) + { + 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_begin (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++) + { + ui_out_tuple_begin (uiout, "src_and_asm_line"); + print_source_lines (symtab, next_line, next_line + 1, + 0); + ui_out_list_begin (uiout, "line_asm_insn"); + ui_out_list_end (uiout); + ui_out_tuple_end (uiout); + } + /* Print the last line and leave list open for + asm instructions to be added. */ + ui_out_tuple_begin (uiout, "src_and_asm_line"); + print_source_lines (symtab, next_line, mle[i].line + 1, 0); + } + } + else + { + ui_out_tuple_begin (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_begin (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) + { + ui_out_list_end (uiout); + ui_out_tuple_end (uiout); + ui_out_text (uiout, "\n"); + close_list = 0; + } + if (how_many >= 0) + if (num_displayed >= how_many) + break; + } + ui_out_list_end (uiout); +} + + +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; + + ui_out_list_begin (uiout, "asm_insns"); + + num_displayed = dump_insns (uiout, di, low, high, how_many, stb); + + ui_out_list_end (uiout); +} + +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); +} |