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Use enums for human-readable exception information. 

Changes to $_siginfo type to this:

(gdb) pt $_siginfo
type = struct EXCEPTION_RECORD {
    enum ExceptionCode ExceptionCode;
    DWORD ExceptionFlags;
    struct EXCEPTION_RECORD *ExceptionRecord;
    PVOID ExceptionAddress;
    DWORD NumberParameters;
    union {
        ULONG_PTR ExceptionInformation[15];
        struct {...} AccessViolationInformation;
    };
}
(gdb) pt $_siginfo.ExceptionCode
type = enum ExceptionCode {FATAL_APP_EXIT = 1073741845,
    DBG_CONTROL_C = 1073807365, DBG_CONTROL_BREAK = 1073807368,
    DATATYPE_MISALIGNMENT = 2147483650, BREAKPOINT, SINGLE_STEP,
    ACCESS_VIOLATION = 3221225477, IN_PAGE_ERROR,
    ILLEGAL_INSTRUCTION = 3221225501, NONCONTINUABLE_EXCEPTION = 3221225509,
    INVALID_DISPOSITION, ARRAY_BOUNDS_EXCEEDED = 3221225612,
    FLOAT_DENORMAL_OPERAND, FLOAT_DIVIDE_BY_ZERO, FLOAT_INEXACT_RESULT,
    FLOAT_INVALID_OPERATION, FLOAT_OVERFLOW, FLOAT_STACK_CHECK,
    FLOAT_UNDERFLOW, INTEGER_DIVIDE_BY_ZERO, INTEGER_OVERFLOW,
    PRIV_INSTRUCTION, STACK_OVERFLOW = 3221225725, FAST_FAIL = 3221226505}
(gdb) pt $_siginfo.AccessViolationInformation
type = struct {
    enum ViolationType Type;
    PVOID Address;
}
(gdb) pt $_siginfo.AccessViolationInformation.Type
type = enum ViolationType {READ_ACCESS_VIOLATION, WRITE_ACCESS_VIOLATION,
    DATA_EXECUTION_PREVENTION_VIOLATION = 8}

Which makes it easier to understand the reason of the exception:

(gdb) p $_siginfo
$1 = {
  ExceptionCode = ACCESS_VIOLATION,
  ExceptionFlags = 0,
  ExceptionRecord = 0x0,
  ExceptionAddress = 0x401632 <main+18>,
  NumberParameters = 2,
  {
    ExceptionInformation = {1, 291, 0 <repeats 13 times>},
    AccessViolationInformation = {
      Type = WRITE_ACCESS_VIOLATION,
      Address = 0x123
    }
  }
}

gdb/ChangeLog:

2020-02-09  Hannes Domani  <ssbssa@yahoo.de>

	* windows-tdep.c (struct enum_value_name): New struct.
	(create_enum): New function.
	(windows_get_siginfo_type): Create and use enum types.
This commit is contained in:
Hannes Domani 2020-01-17 15:50:58 +01:00
parent 7928d571c5
commit 6bafc8451e
2 changed files with 102 additions and 6 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2020-02-09 Hannes Domani <ssbssa@yahoo.de>
* windows-tdep.c (struct enum_value_name): New struct.
(create_enum): New function.
(windows_get_siginfo_type): Create and use enum types.
2020-02-09 Hannes Domani <ssbssa@yahoo.de>
* NEWS: Mention $_siginfo support for Windows.

102
gdb/windows-tdep.c
View File

@ -680,6 +680,71 @@ windows_gdb_signal_to_target (struct gdbarch *gdbarch, enum gdb_signal signal)
return -1;
}
struct enum_value_name
{
uint32_t value;
const char *name;
};
/* Allocate a TYPE_CODE_ENUM type structure with its named values. */
static struct type *
create_enum (struct gdbarch *gdbarch, int bit, const char *name,
const struct enum_value_name *values, int count)
{
struct type *type;
int i;
type = arch_type (gdbarch, TYPE_CODE_ENUM, bit, name);
TYPE_NFIELDS (type) = count;
TYPE_FIELDS (type) = (struct field *)
TYPE_ZALLOC (type, sizeof (struct field) * count);
TYPE_UNSIGNED (type) = 1;
for (i = 0; i < count; i++)
{
TYPE_FIELD_NAME (type, i) = values[i].name;
SET_FIELD_ENUMVAL (TYPE_FIELD (type, i), values[i].value);
}
return type;
}
static const struct enum_value_name exception_values[] =
{
{ 0x40000015, "FATAL_APP_EXIT" },
{ 0x40010005, "DBG_CONTROL_C" },
{ 0x40010008, "DBG_CONTROL_BREAK" },
{ 0x80000002, "DATATYPE_MISALIGNMENT" },
{ 0x80000003, "BREAKPOINT" },
{ 0x80000004, "SINGLE_STEP" },
{ 0xC0000005, "ACCESS_VIOLATION" },
{ 0xC0000006, "IN_PAGE_ERROR" },
{ 0xC000001D, "ILLEGAL_INSTRUCTION" },
{ 0xC0000025, "NONCONTINUABLE_EXCEPTION" },
{ 0xC0000026, "INVALID_DISPOSITION" },
{ 0xC000008C, "ARRAY_BOUNDS_EXCEEDED" },
{ 0xC000008D, "FLOAT_DENORMAL_OPERAND" },
{ 0xC000008E, "FLOAT_DIVIDE_BY_ZERO" },
{ 0xC000008F, "FLOAT_INEXACT_RESULT" },
{ 0xC0000090, "FLOAT_INVALID_OPERATION" },
{ 0xC0000091, "FLOAT_OVERFLOW" },
{ 0xC0000092, "FLOAT_STACK_CHECK" },
{ 0xC0000093, "FLOAT_UNDERFLOW" },
{ 0xC0000094, "INTEGER_DIVIDE_BY_ZERO" },
{ 0xC0000095, "INTEGER_OVERFLOW" },
{ 0xC0000096, "PRIV_INSTRUCTION" },
{ 0xC00000FD, "STACK_OVERFLOW" },
{ 0xC0000409, "FAST_FAIL" },
};
static const struct enum_value_name violation_values[] =
{
{ 0, "READ_ACCESS_VIOLATION" },
{ 1, "WRITE_ACCESS_VIOLATION" },
{ 8, "DATA_EXECUTION_PREVENTION_VIOLATION" },
};
/* Implement the "get_siginfo_type" gdbarch method. */
static struct type *
@ -687,7 +752,8 @@ windows_get_siginfo_type (struct gdbarch *gdbarch)
{
struct windows_gdbarch_data *windows_gdbarch_data;
struct type *dword_type, *pvoid_type, *ulongptr_type;
struct type *siginfo_ptr_type, *siginfo_type;
struct type *code_enum, *violation_enum;
struct type *violation_type, *para_type, *siginfo_ptr_type, *siginfo_type;
windows_gdbarch_data = get_windows_gdbarch_data (gdbarch);
if (windows_gdbarch_data->siginfo_type != NULL)
@ -700,12 +766,38 @@ windows_get_siginfo_type (struct gdbarch *gdbarch)
ulongptr_type = arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
1, "ULONG_PTR");
/* ExceptionCode value names */
code_enum = create_enum (gdbarch, gdbarch_int_bit (gdbarch),
"ExceptionCode", exception_values,
ARRAY_SIZE (exception_values));
/* ACCESS_VIOLATION type names */
violation_enum = create_enum (gdbarch, gdbarch_ptr_bit (gdbarch),
"ViolationType", violation_values,
ARRAY_SIZE (violation_values));
/* ACCESS_VIOLATION information */
violation_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
append_composite_type_field (violation_type, "Type", violation_enum);
append_composite_type_field (violation_type, "Address", pvoid_type);
/* Unnamed union of the documented field ExceptionInformation,
and the alternative AccessViolationInformation (which displays
human-readable values for ExceptionCode ACCESS_VIOLATION). */
para_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
append_composite_type_field (para_type, "ExceptionInformation",
lookup_array_range_type (ulongptr_type, 0, 14));
append_composite_type_field (para_type, "AccessViolationInformation",
violation_type);
siginfo_type = arch_composite_type (gdbarch, "EXCEPTION_RECORD",
TYPE_CODE_STRUCT);
siginfo_ptr_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
NULL, siginfo_type);
append_composite_type_field (siginfo_type, "ExceptionCode", dword_type);
/* ExceptionCode is documented as type DWORD, but here a helper
enum type is used instead to display a human-readable value. */
append_composite_type_field (siginfo_type, "ExceptionCode", code_enum);
append_composite_type_field (siginfo_type, "ExceptionFlags", dword_type);
append_composite_type_field (siginfo_type, "ExceptionRecord",
siginfo_ptr_type);
@ -713,10 +805,8 @@ windows_get_siginfo_type (struct gdbarch *gdbarch)
pvoid_type);
append_composite_type_field (siginfo_type, "NumberParameters", dword_type);
/* The 64-bit variant needs some padding. */
append_composite_type_field_aligned (siginfo_type, "ExceptionInformation",
lookup_array_range_type (ulongptr_type,
0, 14),
TYPE_LENGTH (ulongptr_type));
append_composite_type_field_aligned (siginfo_type, "",
para_type, TYPE_LENGTH (ulongptr_type));
windows_gdbarch_data->siginfo_type = siginfo_type;