32-bit:
Use ANSI C compiler.
CC = /usr/abiccs/bin/cc
64-bit:
Use the 64-bit ANSI C compiler.
CC = /usr/ccs64/bin/cc
AR = /usr/ccs64/bin/ar
3. ELF file format
*** Caution: The following information is empirical. ***
32-bit:
ELF file has a unique format. (See a.out(4) and end(3C).)
&_start
: text segment
&etext
DATASTART
: data segment (initialized)
&edata
DATASTART2
: data segment (uninitialized)
&end
Here, DATASTART and DATASTART2 are macros of GC, and are defined as
the following equations. (See include/private/gcconfig.h.)
The algorithm for DATASTART is similar with the function
GC_SysVGetDataStart() in os_dep.c.
GC has to check addresses both between DATASTART and &edata, and
between DATASTART2 and &end. If a program accesses between &etext
and DATASTART, or between &edata and DATASTART2, the segmentation
error occurs and the program stops.
If a program is statically linked, there is not a gap between
&edata and DATASTART2. The global symbol &_DYNAMIC_LINKING is used
for the detection.
64-bit:
ELF file has a simple format. (See end(3C).)
_ftext
: text segment
_etext
_fdata = DATASTART
: data segment (initialized)
_edata
_fbss
: data segment (uninitialized)
_end = DATAEND
--
Hironori SAKAMOTO
When using the new "configure; make" build process, please
run configure with the --disable-shared option. "Make check" does not
yet pass with dynamic libraries. The reasons for that are not yet
understood. (HB, paraphrasing message from Hironori SAKAMOTO.)
