um: Fetch registers only for signals which need them (3c6ac61b) · Commits · 戴 / test

UML userspace fetches siginfo and passes it to signal handlers in UML. This is needed only for some of the signals, because key handlers like SIGIO make no use of this variable. Signed-off-by:

Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by:

Richard Weinberger <richard@nod.at>

arch/um/os-Linux/skas/process.c

+14 −1

Original line number	Diff line number	Diff line
		@@ -400,7 +400,20 @@ void userspace(struct uml_pt_regs regs, unsigned long aux_fp_regs)
		if (WIFSTOPPED(status)) {
		int sig = WSTOPSIG(status);

		/* These signal handlers need the si argument.
		* The SIGIO and SIGALARM handlers which constitute the
		* majority of invocations, do not use it.
		*/
		switch (sig) {
		case SIGSEGV:
		case SIGTRAP:
		case SIGILL:
		case SIGBUS:
		case SIGFPE:
		case SIGWINCH:
		ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si);
		break;
		}

		switch (sig) {
		case SIGSEGV:

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