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Diffstat (limited to 'contrib/gdb/gdb/disasm.c')
| -rw-r--r-- | contrib/gdb/gdb/disasm.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/disasm.c b/contrib/gdb/gdb/disasm.c new file mode 100644 index 0000000..3cde2ea --- /dev/null +++ b/contrib/gdb/gdb/disasm.c @@ -0,0 +1,395 @@ +/* Disassemble support for GDB. + + Copyright 2000, 2001, 2002, 2003, 2004 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" +#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, bfd_byte *myaddr, unsigned int len, + struct disassemble_info *info) +{ + return target_read_memory (memaddr, (char *) 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) +{ + print_address (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; + + 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, struct 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; + 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_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"); + } + else + 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; + 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 (uiout, di, mle[i].start_pc, mle[i].end_pc, + how_many, 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 ui_out *uiout, struct 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); +} + +/* Initialize the disassemble info struct ready for the specified + stream. */ + +static int +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); + return di; +} + +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) +{ + struct ui_stream *stb = ui_out_stream_new (uiout); + struct cleanup *cleanups = make_cleanup_ui_out_stream_delete (stb); + struct disassemble_info di = gdb_disassemble_info (current_gdbarch, stb->stream); + /* 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 (!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); + + do_cleanups (cleanups); + gdb_flush (gdb_stdout); +} + +/* Print the instruction at address MEMADDR in debugged memory, + on STREAM. Returns length of the instruction, in bytes. */ + +int +gdb_print_insn (CORE_ADDR memaddr, struct ui_file *stream) +{ + struct disassemble_info di = gdb_disassemble_info (current_gdbarch, stream); + return TARGET_PRINT_INSN (memaddr, &di); +} |
