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linux-user/s390x: Use the guest pointer for the sigreturn stub

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When setting up the pointer for the sigreturn stub in the return
address register (r14) we currently use the host frame address instead
of the guest frame address.

Note: This only caused problems if Qemu has been built with
--disable-pie (as it is in distros nowadays). Otherwise guest_base
defaults to 0 hiding the actual problem.

Signed-off-by: Andreas Krebbel <krebbel@linux.ibm.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210324185128.63971-1-krebbel@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Andreas Krebbel 2021-03-24 19:51:28 +01:00 • committed by Laurent Vivier
parent 9e2e9fe3df
commit 23fff7a17f
1 changed files with 3 additions and 2 deletions
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5
linux-user/s390x/signal.c
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@ -211,9 +211,10 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa_flags & TARGET_SA_RESTORER) {
env->regs[14] = (unsigned long) ka->sa_restorer | PSW_ADDR_AMODE;
env->regs[14] = ka->sa_restorer | PSW_ADDR_AMODE;
} else {
env->regs[14] = (unsigned long) frame->retcode | PSW_ADDR_AMODE;
env->regs[14] = (frame_addr + offsetof(typeof(*frame), retcode))
| PSW_ADDR_AMODE;
__put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
(uint16_t *)(frame->retcode));
}