I already did the skeleton ☺
We have a C file (not included in builds - as in producing .o results)
which looks like:
[elsewhere in our foo.h file]
struct abc {
float h[6];
int a[32];
long b;
double c;
};
[asm-offsets.c]
#include <foo.h>
...
#define EMIT_OFFSET(name, type, field) \
unsigned long __offsetof_ ## name = (unsigned long) &(((type *) 0)->field)
EMIT_OFFSET(abc_a, struct abc, a);
EMIT_OFFSET(abc_b, struct abc, b);
EMIT_OFFSET(abc_c, struct abc, c);
...
Then we have a perl script (Yay!) like this:
https://gist.github.com/dlibenzi/a31c823a0c8adedd66ab
That we run as:
$ gen_offsets -i asm-offsets.c -o somewhere/generated/asm-offset.h
x86_64-ucb-akaros-gcc -Isomewhere -Dsomething ...
That will use gcc-S to generate an asm file, than the Perl script
parses it and create the H file.
On Fri, Dec 4, 2015 at 11:28 AM, Barret Rhoden <[email protected]> wrote:
> On 2015-12-04 at 10:47 "'Davide Libenzi' via Akaros"
> <[email protected]> wrote:
> > I didn't say do it like exactly Linux ☺
> > Let me take a look ...
>
> just don't go nuts with it. =) trapentry and all of the asm related
> to context switches are delicate things. you just happened to see some
> of it in this diff. =)
>
> barret
>
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