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