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[Qemu-devel] [PATCH] linux-user: SPARC "rd %tick" can be used by user ap
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] [PATCH] linux-user: SPARC "rd %tick" can be used by user application |
Date: |
Mon, 28 May 2018 21:48:12 +0200 |
we have the same problem decribed in 7d6b1daedd
("linux-user, ppc: mftbl can be used by user application")
for ppc in the case of sparc.
When we use an application trying to resolve a name, it hangs in
0x00000000ff5dd40c: rd %tick, %o5
0x00000000ff5dd410: srlx %o5, 0x20, %o4
0x00000000ff5dd414: btst %o5, %g4
0x00000000ff5dd418: be %icc, 0xff5dd40c
because %tick is staying at 0.
As QEMU_CLOCK_VIRTUAL is not available in linux-user mode,
simply use cpu_get_host_ticks() instead.
Signed-off-by: Laurent Vivier <address@hidden>
---
target/sparc/helper.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/target/sparc/helper.c b/target/sparc/helper.c
index 1d854890b4..46232788c8 100644
--- a/target/sparc/helper.c
+++ b/target/sparc/helper.c
@@ -67,7 +67,9 @@ uint64_t helper_tick_get_count(CPUSPARCState *env, void
*opaque, int mem_idx)
return cpu_tick_get_count(timer);
#else
- return 0;
+ /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist.
+ Just pass through the host cpu clock ticks. */
+ return cpu_get_host_ticks();
#endif
}
--
2.14.3
- [Qemu-devel] [PATCH] linux-user: SPARC "rd %tick" can be used by user application,
Laurent Vivier <=