Currently, get_scno does *much* more than get syscall no.
It checks for post-execve SIGTRAP. It checks for changes
in personality. It retrieves params on entry and registers on exit.
Worse still, it is different in different architectures: for example,
for AVR32 regs are fetched in get_scno(),
On Mon, 2011-08-22 at 12:21 +0200, Denys Vlasenko wrote:
1. Duplicate get_scno into identical get_scno_on_sysenter,
get_scno_on_sysexit functions. Call them in syscall enter and syscall
exit, correspondingly.
diff -d -urpN strace.0/defs.h strace.1/defs.h
--- strace.0/defs.h 2011-08-21
On Mon, 2011-08-22 at 12:21 +0200, Denys Vlasenko wrote:
2. Remove if (entering(tcp)) / if (exiting(tcp)) conditionals from both
functions, since now we know that they are always true or false there.
diff -d -urpN strace.1/syscall.c strace.2/syscall.c
--- strace.1/syscall.c 2011-08-22
On Mon, 2011-08-22 at 12:21 +0200, Denys Vlasenko wrote:
3. Remove scno retrieval code in get_scno_on_sysexit, since we don't
save it anyway. This is the first real logic change which should make
strace faster: for example, on x64 ORIG_EAX is no longer read in each
syscall exit.
diff -d -urpN
On Mon, 2011-08-22 at 12:21 +0200, Denys Vlasenko wrote:
4. Another speedup: on x86, EAX read on syscall entry is also not
necessary if we know that post-execve SIGTRAP is disabled by
PTRACE_O_TRACEEXEC ptrace option. This patch (a) moves EAX retrieval
from syscall_fixup to
On Mon, 2011-08-22 at 12:21 +0200, Denys Vlasenko wrote:
5. Move post-execve SIGTRAP from get_scno_on_sysenter (multitude of
places on many architectures) to a single location in
trace_syscall_entering. This loosens the logic for some arches, since
many of them had additional checks such as
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