86 lines
1.4 KiB
C
86 lines
1.4 KiB
C
/*
|
|
* syscall.c for mdb
|
|
*/
|
|
#include "mdb.h"
|
|
#ifdef SYSCALLS_SUPPORT
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/ptrace.h>
|
|
#include "proto.h"
|
|
|
|
#define SYSCALL_NAME "__sendrec"
|
|
#ifdef __i386
|
|
#define SYSCALL_OFFSET 0xF
|
|
#define SYSCALL_OLD 0x21CD
|
|
#else
|
|
#define SYSCALL_OFFSET 0xE
|
|
#define SYSCALL_OLD 0x20CD
|
|
#endif
|
|
|
|
PRIVATE long intaddr;
|
|
|
|
PUBLIC void start_syscall(addr)
|
|
long addr;
|
|
{
|
|
long old;
|
|
|
|
syscalls = FALSE;
|
|
|
|
if ( addr == 0 ) {
|
|
intaddr = symbolvalue( SYSCALL_NAME, TRUE );
|
|
if ( intaddr == 0 )
|
|
return;
|
|
intaddr += SYSCALL_OFFSET;
|
|
}
|
|
else {
|
|
intaddr = addr;
|
|
Printf("Using %lx as syscall address\n",addr);
|
|
}
|
|
|
|
old = breakpt(intaddr,"\n");
|
|
|
|
/* Check instruction */
|
|
if ( (old & 0xFFFF) == SYSCALL_OLD)
|
|
syscalls = TRUE;
|
|
|
|
}
|
|
|
|
PUBLIC void do_syscall(addr)
|
|
long addr;
|
|
{
|
|
unsigned reg_ax,reg_bx;
|
|
|
|
if ( addr != intaddr ) return;
|
|
|
|
Printf("syscall to ");
|
|
|
|
reg_ax = get_reg(curpid,reg_addr("AX"));
|
|
|
|
switch (reg_ax) {
|
|
case 0: Printf(" MM ");
|
|
break;
|
|
case 1: Printf(" FS ");
|
|
break;
|
|
case 2: Printf(" INET ");
|
|
break;
|
|
default: Printf("Invalid dest = %d", reg_ax);
|
|
exit(0);
|
|
}
|
|
|
|
|
|
reg_bx = get_reg(curpid,reg_addr("BX"));
|
|
decode_message(reg_bx);
|
|
|
|
/* Single step */
|
|
tstart(T_STEP, 0, 0, 1);
|
|
|
|
/* Check return code */
|
|
reg_ax = get_reg(curpid,reg_addr("AX"));
|
|
if ( reg_ax != 0 )
|
|
Printf("syscall failed AX=%d\n",reg_ax);
|
|
else
|
|
decode_result();
|
|
}
|
|
|
|
#endif /* SYSCALLS_SUPPORT */
|