gistfile1.txt

$ uname -a
SunOS t1000-a 5.11 tribblix-m20.6 sun4v sparc SUNW,Sun-Fire-T1000
$ mach
sparc
$ make
gcc -g -O2 -std=c99 -D_ASM_INLINES -D__EXTENSIONS__ -c  mblk.c
gcc -g -O2 -std=c99 -D_ASM_INLINES -D__EXTENSIONS__ -c  old_sum.c
gcc -g -O2 -std=c99 -D_ASM_INLINES -D__EXTENSIONS__ -c  new_sum.c
gcc -D_ASM_INLINES -D__EXTENSIONS__ -g -O2 -std=c99 -o mblk mblk.o old_sum.o new_sum.o
/opt/onbld/bin/$(mach)/ctfconvert mblk
$ ./mblk 
Offset = 0
    Single mblk: old=0x3246 new=0x3246 OK
     Chain mblk: old=0x3246 new=0x3246 OK

Offset = 4
    Single mblk: old=0x13a2 new=0x13a2 OK
     Chain mblk: old=0x13a2 new=0x13a2 OK

Offset = 14
    Single mblk: old=0xaf11 new=0xaf11 OK
     Chain mblk: old=0xaf11 new=0xaf11 OK

Offset = 16
    Single mblk: old=0xd744 new=0xd744 OK
     Chain mblk: old=0xd744 new=0xd744 OK

Unaligned pointer test:

Offset = 0
    Single mblk: old=0x45a7 new=0x45a7 OK
     Chain mblk: old=0x45a7 new=0x45a7 OK

Offset = 4
    Single mblk: old=0xa14f new=0xa14f OK
     Chain mblk: old=0xa14f new=0xa14f OK

Offset = 14
    Single mblk: old=0x10d8 new=0x10d8 OK
     Chain mblk: old=0x10d8 new=0x10d8 OK

Offset = 16
    Single mblk: old=0x44a5 new=0x44a5 OK
     Chain mblk: old=0x44a5 new=0x44a5 OK