it appers that either i386das and i386inst are misnamed, or they
are listed incorrectly in /sys/src/libmach/8db.c. since at least [v7]db
follow the same pattern, i'm pretty sure the header file is wrong.
also i believe the setting of errstr() in i386das and i386inst is incorrect.
(for a demonstration, try asm(stackaddress) on a running 386 executable.
you'll get a few bytes of unprintable garbage.)
- erik
Machdata i386mach =
{
{0xCC, 0, 0, 0}, /* break point: INT 3 */
1, /* break point size */
leswab, /* convert short to local byte order */
leswal, /* convert long to local byte order */
leswav, /* convert vlong to local byte order */
i386trace, /* C traceback */
i386frame, /* frame finder */
i386excep, /* print exception */
0, /* breakpoint fixup */
leieeesftos, /* single precision float printer */
leieeedftos, /* double precision float printer */
i386foll, /* following addresses */
>> i386inst, /* print instruction */
>> i386das, /* dissembler */
i386instlen, /* instruction size calculation */
};
yet
/sys/include/mach.h:202,219
struct Machdata { /* Machine-dependent debugger support */
uchar bpinst[4]; /* break point instr. */
short bpsize; /* size of break point instr. */
ushort (*swab)(ushort); /* ushort to local byte order */
ulong (*swal)(ulong); /* ulong to local byte order */
uvlong (*swav)(uvlong); /* uvlong to local byte order */
int (*ctrace)(Map*, uvlong, uvlong, uvlong, Tracer); /* C traceback
*/
uvlong (*findframe)(Map*, uvlong, uvlong, uvlong, uvlong);/* frame
finder */
char* (*excep)(Map*, Rgetter); /* last exception */
ulong (*bpfix)(uvlong); /* breakpoint fixup */
int (*sftos)(char*, int, void*); /* single precision float */
int (*dftos)(char*, int, void*); /* double precision float */
int (*foll)(Map*, uvlong, Rgetter, uvlong*);/* follow set */
>> int (*das)(Map*, uvlong, char, char*, int); /* symbolic disassembly
>> */
>> int (*hexinst)(Map*, uvlong, char*, int); /* hex disassembly */
int (*instsize)(Map*, uvlong); /* instruction size */
};
