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linux-user: Fix endianess of aarch64 signal trampoline 

Since for aarch64 the signal trampoline is synthesized directly into the
signal frame we need to make sure the instructions end up little-endian.
Otherwise the wrong endianness will cause a SIGILL upon return from the
signal handler on big-endian targets.

Signed-off-by: Michael Weiser <michael.weiser@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20171220212308.12614-4-michael.weiser@gmx.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Michael Weiser 2018-01-11 13:25:31 +00:00 committed by Peter Maydell
parent cb3aa5fea1
commit 50f22fa60d
1 changed files with 7 additions and 3 deletions
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10
linux-user/signal.c
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@ -1599,9 +1599,13 @@ static void target_setup_frame(int usig, struct target_sigaction *ka,
if (ka->sa_flags & TARGET_SA_RESTORER) { if (ka->sa_flags & TARGET_SA_RESTORER) {
return_addr = ka->sa_restorer; return_addr = ka->sa_restorer;
} else { } else {
/* mov x8,#__NR_rt_sigreturn; svc #0 */ /*
__put_user(0xd2801168, &frame->tramp[0]); * mov x8,#__NR_rt_sigreturn; svc #0
__put_user(0xd4000001, &frame->tramp[1]); * Since these are instructions they need to be put as little-endian
* regardless of target default or current CPU endianness.
*/
__put_user_e(0xd2801168, &frame->tramp[0], le);
__put_user_e(0xd4000001, &frame->tramp[1], le);
return_addr = frame_addr + offsetof(struct target_rt_sigframe, tramp); return_addr = frame_addr + offsetof(struct target_rt_sigframe, tramp);
} }
env->xregs[0] = usig; env->xregs[0] = usig;