Hi Bob
(copying this to leaf-devel)
Sorry, I was too fast, I did not look into the i386 code but the one in
x86_64
Am 03.05.2017 um 20:03 schrieb Robert K Coffman Jr. -Info From Data Corp.:
Eric,
IRC user ddrown confirmed the x64 patch I mentioned earlier seems to fix
the issue on i386 as well. I'm not really sure what to do with that
information. Is it possible to patch Leaf with it?
https://gist.github.com/ddrown/15e943b8fe1da398320b0c0518c95554
I don't know. It looks like the RESTORE2 macro is extended with a nop
operator in this patch. This looks like assembly code.
...
This is i386...
#define RESTORE(name, syscall) RESTORE2(name, syscall)
#ifdef __NR_rt_sigaction
/* The return code for realtime-signals. */
# define RESTORE2(name, syscall) \
__asm__ ( \
".text\n" \
"__" #name ":\n"\
" movl$" #syscall ", %eax\n" \
" int $0x80\n"\
);
RESTORE(restore_rt, __NR_rt_sigreturn)
#endif
#ifdef __NR_sigreturn
/* For the boring old signals. */
# undef RESTORE2
# define RESTORE2(name, syscall) \
__asm__ ( \
".text\n" \
"__" #name ":\n"\
" popl%eax\n" \
" movl$" #syscall ", %eax\n" \
" int $0x80\n"\
);
RESTORE(restore, __NR_sigreturn)
#endif
and this is x86_64
#define RESTORE(name, syscall) RESTORE2(name, syscall)
#define RESTORE2(name, syscall) \
__asm__ ( \
"nop\n" \
".text\n" \
"__" #name ":\n"\
" movq$" #syscall ", %rax\n" \
" syscall\n" \
);
#ifdef __NR_rt_sigaction
/* The return code for realtime-signals. */
RESTORE(restore_rt, __NR_rt_sigreturn)
#endif
#ifdef __NR_sigreturn
RESTORE(restore, __NR_sigreturn)
#endif
So in i386 the patch appears to be possible, if it is necessary I don't
know as it looks like the nop operator could be used to make the
assembly code align to instruction size. The nop operator is already in
the x86_64 code.
I have not followed uClibc development. I am wondering what their
position is on this issue.
cheers
ET
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