[unix-history] / usr / src / contrib / mprof / PORT-NOTES


From Jeffrey Hsu on the port of mprof to the MIPS:
Date: 8/90

    mprof.c
      added some #includes for mips compiler stuff
      created global int variable intloc for use by assembly language routines
      mips traverses the stack differently
      call pdrinit in mprof_startup to read in symbol table
      used __Argv as alternative to making the application stash argv in some
	global somewhere
      dynamically set mp_root_address to an address between __start and main
      added routines pdrinit, getpdr, getretaddr to handle stack traces
      I assume the frame register is 29 and the return address is in 31.

    mpfilt.c
      pretty much the same code as mprof.c to read in the symbol table
      added code to read in structures and typedefs
	pretty hairy
    -> note:  mpheader is a typedef not a structure
	mprof only screens out types, in mpf_intern_type
	so you may see a mpheader under the size 8 bin
	but you can fix that using the same mechanism in mpf_intern_typedef

    mprof.h
      define CRT0_ADDRESS to dummy value

    Makefile
      mostly like sun4
      changed ASFLAGS to take out sun stuff
      changed the way the library was created
	Is there some reason for copying libc.a rather than creating a separate
	library?  The user will have to change his command line in either case.

    md.s
      added routines to get reg 29 and 31
      note: calling the routine to get reg 31 changes reg 31,
	    so we're not really getting reg 31, but the pc at the time we
	    call reg 31
	    all this is accounted for in the code

    mpattach.c
      added check for realloc w/ null pointer, not really mips specific
	advantages:  some applications can now run w/o modification
	disadvantages:  if you use this feature, the direct allocation table
	    will show realloc as a caller of malloc and your leak table may
	    have realloc as the last function to call malloc
      added mips to the #if check for redefining exit
Commit	Line	Data
5718e5f3 C	1
	2	From Jeffrey Hsu on the port of mprof to the MIPS:
	3	Date: 8/90
	4
	5	mprof.c
	6	added some #includes for mips compiler stuff
	7	created global int variable intloc for use by assembly language routines
	8	mips traverses the stack differently
	9	call pdrinit in mprof_startup to read in symbol table
	10	used __Argv as alternative to making the application stash argv in some
	11	global somewhere
	12	dynamically set mp_root_address to an address between __start and main
	13	added routines pdrinit, getpdr, getretaddr to handle stack traces
	14	I assume the frame register is 29 and the return address is in 31.
	15
	16	mpfilt.c
	17	pretty much the same code as mprof.c to read in the symbol table
	18	added code to read in structures and typedefs
	19	pretty hairy
	20	-> note: mpheader is a typedef not a structure
	21	mprof only screens out types, in mpf_intern_type
	22	so you may see a mpheader under the size 8 bin
	23	but you can fix that using the same mechanism in mpf_intern_typedef
	24
	25	mprof.h
	26	define CRT0_ADDRESS to dummy value
	27
	28	Makefile
	29	mostly like sun4
	30	changed ASFLAGS to take out sun stuff
	31	changed the way the library was created
	32	Is there some reason for copying libc.a rather than creating a separate
	33	library? The user will have to change his command line in either case.
	34
	35	md.s
	36	added routines to get reg 29 and 31
	37	note: calling the routine to get reg 31 changes reg 31,
	38	so we're not really getting reg 31, but the pc at the time we
	39	call reg 31
	40	all this is accounted for in the code
	41
	42	mpattach.c
	43	added check for realloc w/ null pointer, not really mips specific
	44	advantages: some applications can now run w/o modification
	45	disadvantages: if you use this feature, the direct allocation table
	46	will show realloc as a caller of malloc and your leak table may
	47	have realloc as the last function to call malloc
	48	added mips to the #if check for redefining exit