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[PATCH] target/hppa: Fix proberi instruction emulation for linux-user

From: Helge Deller
Subject: [PATCH] target/hppa: Fix proberi instruction emulation for linux-user
Date: Tue, 16 Aug 2022 09:58:14 +0200

The proberi assembler instruction checks the read/write access rights
for the page of a given address and shall return a value of 1 if the
test succeeds and a value of 0 on failure in the target register.

But when run in linux-user mode, qemu currently simply returns the
return code of page_check_range() which returns 0 on success and -1 on
failure, which is the opposite of what proberi should return.

Fix it by checking the return code of page_check_range() and return the
expected return value.

The easiest way to reproduce the issue is by running
"/lib/ld.so.1 --version" in a chroot which fails without this patch.
At startup of ld.so the __canonicalize_funcptr_for_compare() function is
used to resolve the function address out of a function descriptor, which
fails because proberi (due to the wrong return code) seems to indicate
that the given address isn't accessible.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/target/hppa/op_helper.c b/target/hppa/op_helper.c
index cd304f051e..fbd80e4248 100644
--- a/target/hppa/op_helper.c
+++ b/target/hppa/op_helper.c
@@ -170,7 +170,7 @@ target_ureg HELPER(probe)(CPUHPPAState *env, target_ulong 
                           uint32_t level, uint32_t want)
-    return page_check_range(addr, 1, want);
+    return (page_check_range(addr, 1, want) == 0) ? 1 : 0;
     int prot, excp;
     hwaddr phys;

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