[RFC PATCH 3/8] readelf: emit simple to parse line .debug_line data
From: Jason Wessel
Date: Fri Apr 20 2012 - 17:30:13 EST
A quiet option was added so as to emit only the following data when
running readelf. Example:
scripts/readelf -q --debug-dump=line vmlinux
[...]
sched.c:45 0xffffffff81011e79
sched.c:49 0xffffffff81011e80
It is important to leave the original printfs behind as they are
required in order to debug problems related to parsing the debug line
data.
Signed-off-by: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
---
scripts/readelf.c | 218 ++++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 164 insertions(+), 54 deletions(-)
diff --git a/scripts/readelf.c b/scripts/readelf.c
index 6ed944f..228de30 100644
--- a/scripts/readelf.c
+++ b/scripts/readelf.c
@@ -236,6 +236,7 @@ Elf_Internal_Shdr *section_headers;
Elf_Internal_Shdr *symtab_shndx_hdr;
int show_name;
int do_dump;
+int do_quiet;
int do_wide;
int do_debug_lines;
int is_32bit_elf;
@@ -605,6 +606,7 @@ usage ()
fprintf (stdout, " Options are:\n\
--debug-dump=line Display the contents of DWARF2 debug sections\n");
fprintf (stdout, "\
+ -q Only emit line number data\n\
-W --wide Allow output width to exceed 80 characters\n\
-H --help Display this information\n");
@@ -653,7 +655,7 @@ parse_args (argc, argv)
usage ();
while ((c = getopt_long
- (argc, argv, "WH", options, NULL)) != EOF)
+ (argc, argv, "qWH", options, NULL)) != EOF)
{
switch (c)
@@ -665,6 +667,10 @@ parse_args (argc, argv)
usage ();
break;
+ case 'q':
+ do_quiet = 1;
+ break;
+
case OPTION_DEBUG_DUMP:
do_dump++;
{
@@ -1006,6 +1012,7 @@ process_extended_line_op (data, is_stmt, pointer_size)
unsigned int len;
unsigned char *name;
unsigned long adr;
+ unsigned long val;
len = read_leb128 (data, & bytes_read, 0);
data += bytes_read;
@@ -1019,38 +1026,55 @@ process_extended_line_op (data, is_stmt, pointer_size)
len += bytes_read;
op_code = *data++;
- printf (" Extended opcode %d: ", op_code);
+ if (!do_quiet)
+ printf (" Extended opcode %d: ", op_code);
switch (op_code)
{
case DW_LNE_end_sequence:
- printf ("End of Sequence\n\n");
+ if (!do_quiet)
+ printf ("End of Sequence\n\n");
reset_state_machine (is_stmt);
break;
case DW_LNE_set_address:
adr = byte_get (data, pointer_size);
- printf ("set Address to 0x%lx\n", adr);
+ if (!do_quiet)
+ printf ("set Address to 0x%lx\n", adr);
state_machine_regs.address = adr;
break;
case DW_LNE_define_file:
- printf (" define new File Table entry\n");
- printf (" Entry\tDir\tTime\tSize\tName\n");
+ if (!do_quiet)
+ {
+ printf (" define new File Table entry\n");
+ printf (" Entry\tDir\tTime\tSize\tName\n");
+ }
- printf (" %d\t", ++state_machine_regs.last_file_entry);
+ ++state_machine_regs.last_file_entry;
+ if (!do_quiet)
+ printf (" %d\t", state_machine_regs.last_file_entry);
name = data;
data += strlen ((char *) data) + 1;
- printf ("%lu\t", read_leb128 (data, & bytes_read, 0));
+ val = read_leb128 (data, & bytes_read, 0);
+ if (!do_quiet)
+ printf ("%lu\t", val);
data += bytes_read;
- printf ("%lu\t", read_leb128 (data, & bytes_read, 0));
+ val = read_leb128 (data, & bytes_read, 0);
+ if (!do_quiet)
+ printf ("%lu\t", val);
data += bytes_read;
- printf ("%lu\t", read_leb128 (data, & bytes_read, 0));
- printf ("%s\n\n", name);
+ val = read_leb128 (data, & bytes_read, 0);
+ if (!do_quiet)
+ {
+ printf ("%lu\t", val);
+ printf ("%s\n\n", name);
+ }
break;
default:
- printf ("UNKNOWN: length %d\n", len - bytes_read);
+ if (!do_quiet)
+ printf ("UNKNOWN: length %d\n", len - bytes_read);
break;
}
@@ -1074,11 +1098,15 @@ display_debug_lines (section, start, file)
unsigned char *data = start;
unsigned char *end = start + section->sh_size;
unsigned char *end_of_sequence;
+ unsigned int max_ftable = 0;
+ unsigned char **ftable = NULL;
+
int i;
int offset_size;
int initial_length_size;
- printf ("\nDump of debug contents of section %s:\n\n",
+ if (!do_quiet)
+ printf ("\nDump of debug contents of section %s:\n\n",
SECTION_NAME (section));
while (data < end)
@@ -1136,14 +1164,17 @@ display_debug_lines (section, start, file)
info.li_line_base <<= 24;
info.li_line_base >>= 24;
- printf (" Length: %ld\n", info.li_length);
- printf (" DWARF Version: %d\n", info.li_version);
- printf (" Prologue Length: %d\n", info.li_prologue_length);
- printf (" Minimum Instruction Length: %d\n", info.li_min_insn_length);
- printf (" Initial value of 'is_stmt': %d\n", info.li_default_is_stmt);
- printf (" Line Base: %d\n", info.li_line_base);
- printf (" Line Range: %d\n", info.li_line_range);
- printf (" Opcode Base: %d\n", info.li_opcode_base);
+ if (!do_quiet)
+ {
+ printf (" Length: %ld\n", info.li_length);
+ printf (" DWARF Version: %d\n", info.li_version);
+ printf (" Prologue Length: %d\n", info.li_prologue_length);
+ printf (" Minimum Instruction Length: %d\n", info.li_min_insn_length);
+ printf (" Initial value of 'is_stmt': %d\n", info.li_default_is_stmt);
+ printf (" Line Base: %d\n", info.li_line_base);
+ printf (" Line Range: %d\n", info.li_line_range);
+ printf (" Opcode Base: %d\n", info.li_opcode_base);
+ }
end_of_sequence = data + info.li_length + initial_length_size;
@@ -1152,23 +1183,30 @@ display_debug_lines (section, start, file)
/* Display the contents of the Opcodes table. */
standard_opcodes = hdrptr;
- printf ("\n Opcodes:\n");
+ if (!do_quiet) {
+ printf ("\n Opcodes:\n");
- for (i = 1; i < info.li_opcode_base; i++)
- printf (" Opcode %d has %d args\n", i, standard_opcodes[i - 1]);
+ for (i = 1; i < info.li_opcode_base; i++)
+ printf (" Opcode %d has %d args\n", i, standard_opcodes[i - 1]);
+ }
/* Display the contents of the Directory table. */
data = standard_opcodes + info.li_opcode_base - 1;
if (*data == 0)
- printf ("\n The Directory Table is empty.\n");
+ {
+ if (!do_quiet)
+ printf ("\n The Directory Table is empty.\n");
+ }
else
{
- printf ("\n The Directory Table:\n");
+ if (!do_quiet)
+ printf ("\n The Directory Table:\n");
while (*data != 0)
{
- printf (" %s\n", data);
+ if (!do_quiet)
+ printf (" %s\n", data);
data += strlen ((char *) data) + 1;
}
@@ -1177,31 +1215,81 @@ display_debug_lines (section, start, file)
/* Skip the NUL at the end of the table. */
data++;
+ if (ftable)
+ {
+ while (max_ftable)
+ {
+ max_ftable--;
+ free(ftable[max_ftable]);
+ }
+ free(ftable);
+ ftable = NULL;
+ }
+ max_ftable = 0;
/* Display the contents of the File Name table. */
if (*data == 0)
- printf ("\n The File Name Table is empty.\n");
+ {
+ if (!do_quiet)
+ printf ("\n The File Name Table is empty.\n");
+ }
else
{
- printf ("\n The File Name Table:\n");
- printf (" Entry\tDir\tTime\tSize\tName\n");
+ unsigned char *data_reset = data;
+ if (!do_quiet)
+ {
+ printf ("\n The File Name Table:\n");
+ printf (" Entry\tDir\tTime\tSize\tName\n");
+ }
while (*data != 0)
{
unsigned char *name;
int bytes_read;
+ unsigned long ret;
- printf (" %d\t", ++state_machine_regs.last_file_entry);
+ max_ftable++;
+ if (!do_quiet)
+ printf (" %d\t", ++state_machine_regs.last_file_entry);
name = data;
data += strlen ((char *) data) + 1;
- printf ("%lu\t", read_leb128 (data, & bytes_read, 0));
+ ret = read_leb128 (data, & bytes_read, 0);
+ if (!do_quiet)
+ printf ("%lu\t", ret);
+ data += bytes_read;
+ ret = read_leb128 (data, & bytes_read, 0);
+ if (!do_quiet)
+ printf ("%lu\t", ret);
+ data += bytes_read;
+ ret = read_leb128 (data, & bytes_read, 0);
+ if (!do_quiet)
+ printf ("%lu\t", ret);
+ data += bytes_read;
+ if (!do_quiet)
+ printf ("%s\n", name);
+ }
+ /* Allocate file table array */
+ ftable = malloc(sizeof(char *) * max_ftable);
+ data = data_reset;
+ max_ftable = 0;
+ while (*data != 0)
+ {
+ int bytes_read;
+
+ ftable[max_ftable] = (unsigned char *)strdup((char *)data);
+ if (!ftable[max_ftable])
+ abort();
+ max_ftable++;
+
+ data += strlen ((char *) data) + 1;
+
+ read_leb128 (data, & bytes_read, 0);
data += bytes_read;
- printf ("%lu\t", read_leb128 (data, & bytes_read, 0));
+ read_leb128 (data, & bytes_read, 0);
data += bytes_read;
- printf ("%lu\t", read_leb128 (data, & bytes_read, 0));
+ read_leb128 (data, & bytes_read, 0);
data += bytes_read;
- printf ("%s\n", name);
}
}
@@ -1209,7 +1297,8 @@ display_debug_lines (section, start, file)
data++;
/* Now display the statements. */
- printf ("\n Line Number Statements:\n");
+ if (!do_quiet)
+ printf ("\n Line Number Statements:\n");
while (data < end_of_sequence)
@@ -1225,12 +1314,17 @@ display_debug_lines (section, start, file)
op_code -= info.li_opcode_base;
adv = (op_code / info.li_line_range) * info.li_min_insn_length;
state_machine_regs.address += adv;
- printf (" Special opcode %d: advance Address by %d to 0x%lx",
+ if (!do_quiet)
+ printf (" Special opcode %d: advance Address by %d to 0x%lx",
op_code, adv, state_machine_regs.address);
adv = (op_code % info.li_line_range) + info.li_line_base;
state_machine_regs.line += adv;
- printf (" and Line by %d to %d\n",
+ if (!do_quiet)
+ printf (" and Line by %d to %d\n",
adv, state_machine_regs.line);
+ if (do_quiet)
+ printf("%s:%u 0x%lx\n", ftable[state_machine_regs.file - 1],
+state_machine_regs.line, state_machine_regs.address);
}
else switch (op_code)
{
@@ -1240,14 +1334,16 @@ display_debug_lines (section, start, file)
break;
case DW_LNS_copy:
- printf (" Copy\n");
+ if (!do_quiet)
+ printf (" Copy\n");
break;
case DW_LNS_advance_pc:
adv = info.li_min_insn_length * read_leb128 (data, & bytes_read, 0);
data += bytes_read;
state_machine_regs.address += adv;
- printf (" Advance PC by %d to %lx\n", adv,
+ if (!do_quiet)
+ printf (" Advance PC by %d to %lx\n", adv,
state_machine_regs.address);
break;
@@ -1255,14 +1351,16 @@ display_debug_lines (section, start, file)
adv = read_leb128 (data, & bytes_read, 1);
data += bytes_read;
state_machine_regs.line += adv;
- printf (" Advance Line by %d to %d\n", adv,
+ if (!do_quiet)
+ printf (" Advance Line by %d to %d\n", adv,
state_machine_regs.line);
break;
case DW_LNS_set_file:
adv = read_leb128 (data, & bytes_read, 0);
data += bytes_read;
- printf (" Set File Name to entry %d in the File Name Table\n",
+ if (!do_quiet)
+ printf (" Set File Name to entry %d in the File Name Table\n",
adv);
state_machine_regs.file = adv;
break;
@@ -1270,19 +1368,22 @@ display_debug_lines (section, start, file)
case DW_LNS_set_column:
adv = read_leb128 (data, & bytes_read, 0);
data += bytes_read;
- printf (" Set column to %d\n", adv);
+ if (!do_quiet)
+ printf (" Set column to %d\n", adv);
state_machine_regs.column = adv;
break;
case DW_LNS_negate_stmt:
adv = state_machine_regs.is_stmt;
adv = ! adv;
- printf (" Set is_stmt to %d\n", adv);
+ if (!do_quiet)
+ printf (" Set is_stmt to %d\n", adv);
state_machine_regs.is_stmt = adv;
break;
case DW_LNS_set_basic_block:
- printf (" Set basic block\n");
+ if (!do_quiet)
+ printf (" Set basic block\n");
state_machine_regs.basic_block = 1;
break;
@@ -1290,7 +1391,8 @@ display_debug_lines (section, start, file)
adv = (((255 - info.li_opcode_base) / info.li_line_range)
* info.li_min_insn_length);
state_machine_regs.address += adv;
- printf (" Advance PC by constant %d to 0x%lx\n", adv,
+ if (!do_quiet)
+ printf (" Advance PC by constant %d to 0x%lx\n", adv,
state_machine_regs.address);
break;
@@ -1298,40 +1400,48 @@ display_debug_lines (section, start, file)
adv = byte_get (data, 2);
data += 2;
state_machine_regs.address += adv;
- printf (" Advance PC by fixed size amount %d to 0x%lx\n",
+ if (!do_quiet)
+ printf (" Advance PC by fixed size amount %d to 0x%lx\n",
adv, state_machine_regs.address);
break;
case DW_LNS_set_prologue_end:
- printf (" Set prologue_end to true\n");
+ if (!do_quiet)
+ printf (" Set prologue_end to true\n");
break;
case DW_LNS_set_epilogue_begin:
- printf (" Set epilogue_begin to true\n");
+ if (!do_quiet)
+ printf (" Set epilogue_begin to true\n");
break;
case DW_LNS_set_isa:
adv = read_leb128 (data, & bytes_read, 0);
data += bytes_read;
- printf (" Set ISA to %d\n", adv);
+ if (!do_quiet)
+ printf (" Set ISA to %d\n", adv);
break;
default:
- printf (" Unknown opcode %d with operands: ", op_code);
+ if (!do_quiet)
+ printf (" Unknown opcode %d with operands: ", op_code);
{
int i;
for (i = standard_opcodes[op_code - 1]; i > 0 ; --i)
{
- printf ("0x%lx%s", read_leb128 (data, &bytes_read, 0),
+ if (!do_quiet)
+ printf ("0x%lx%s", read_leb128 (data, &bytes_read, 0),
i == 1 ? "" : ", ");
data += bytes_read;
}
- putchar ('\n');
+ if (!do_quiet)
+ putchar ('\n');
}
break;
}
}
- putchar ('\n');
+ if (!do_quiet)
+ putchar ('\n');
}
return 1;
--
1.7.10
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