From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Wed, 3 Aug 2016 07:55:23 +0000 (+1000)
Subject: ppc: Fix catching some segfaults in user mode
X-Git-Tag: v2.8.0-rc0~155^2~8
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ba4a8df83f474be1ba02510f960e5224f29d229c;p=qemu-xen-unstable.git

ppc: Fix catching some segfaults in user mode

The usermode "translate" code generates an error code value that
has the "is_write" bit set, which causes our switch/case to miss
and display "Invalid segfault errno" and a spurrious second state
dump. Fix it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---

diff --git a/linux-user/main.c b/linux-user/main.c
index d112834644..32070a4a0f 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -1656,6 +1656,7 @@ void cpu_loop(CPUPPCState *env)
             /* XXX: check this. Seems bugged */
             switch (env->error_code & 0xFF000000) {
             case 0x40000000:
+            case 0x42000000:
                 info.si_signo = TARGET_SIGSEGV;
                 info.si_errno = 0;
                 info.si_code = TARGET_SEGV_MAPERR;