#3337 sdcdb crashes upon setting bp

[rofl0r]

using 4.2.0 rc2
sdcdb crashes upon entering: b main

gdb --args /opt/sdcc/bin/sdcdb -mz80 hello.com
(gdb) r
SDCDB 0.9. Copyright (C) 1999 Sandeep Dutta (sandeep.dutta@usa.net)
Type ? for help
WARNING: SDCDB is EXPERIMENTAL.
(sdcdb) b main

Program received signal SIGSEGV, Segmentation fault.
0x0000000000408f14 in setBPatModLine (mod=0x0, line=0, bpType=4 '\004')
    at cmd.c:396
396     cmd.c: No such file or directory.
(gdb) bt
#0  0x0000000000408f14 in setBPatModLine (mod=0x0, line=0, bpType=4 '\004')
#1  0x000000000040ad2e in commonSetUserBp (s=0x6235a2 <cmdbuff+2> "main", 
    cctxt=0x629c60, bpType=4 '\004') at cmd.c:1163
#2  0x000000000040ad8c in cmdSetUserBp (s=0x6235a1 <cmdbuff+1> " main", 
    cctxt=0x629c60) at cmd.c:1186
#3  0x000000000040324c in interpretCmd (s=0x6235a0 <cmdbuff> "b main")
    at sdcdb.c:1036
#4  0x000000000040351e in commandLoop (cmdfile=0x7ffff7ffb1e0 <__stdin_FILE>)
    at sdcdb.c:1650
#5  0x000000000040467d in main (argc=3, argv=0x7fffffffeb58) at sdcdb.c:2121

hello.com was produced like this:

/* the first function is the entry point, do not remove this */
void _start(void) __naked{
        __asm;
        ld sp, #0xff00
        add ix, sp
        jp _main
        __endasm;
}

/* arg1 comes in hl */
void puts(const char *const str) __sdcccall(1)
{
  str;
  __asm
    ex de, hl
    ld c,#9
    call 5
  __endasm;
}
int main()
{
  puts("Hello world$");
  return 0;
}

makefile:

CC=sdcc
CFLAGS=-mz80 --code-loc 0x100 --no-std-crt0 --debug

hello.com:

%.ihx: %.c
        $(CC) $(CFLAGS) $< 

%.com: %.ihx
        objcopy -Iihex -Obinary $< $@
        test -e $*.cdb && mv $*.cdb $*.com.cdb
        echo $<

%.rel: %.s
        sdasz80 -o $<

clean:
        rm -rf *.sym *.rel *.lk *.lst *.noi *.map *.cdb hello.com