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[Qemu-ppc] [PATCH] linux-user, ppc: mftbl can be used by user applicatio
From: |
Laurent Vivier |
Subject: |
[Qemu-ppc] [PATCH] linux-user, ppc: mftbl can be used by user application |
Date: |
Fri, 26 Jun 2015 10:24:37 +0200 |
In qemu-linux-user, when calling gethostbyname2(),
it was hanging in .__res_nmkquery.
(gdb) bt
0 in .__res_nmkquery () from /lib64/libresolv.so.2
1 in .__libc_res_nquery () from /lib64/libresolv.so.2
2 in .__libc_res_nsearch () from /lib64/libresolv.so.2
3 in ._nss_dns_gethostbyname3_r () from /lib64/libnss_dns.so.2
4 in ._nss_dns_gethostbyname2_r () from /lib64/libnss_dns.so.2
5 in .gethostbyname2_r () from /lib64/libc.so.6
6 in .gethostbyname2 () from /lib64/libc.so.6
.__res_nmkquery() is:
...
do { RANDOM_BITS (randombits); } while ((randombits & 0xffff) == 0);
...
<.__res_nmkquery+112>: mftbl r11
<.__res_nmkquery+116>: clrlwi r10,r11,16
<.__res_nmkquery+120>: cmpwi cr7,r10,0
<.__res_nmkquery+124>: beq cr7,<.__res_nmkquery+112>
but as mftbl (Move From Time Base Lower) is not implemented,
r11 is always 0, so we have an infinite loop.
This patch fills the Time Base register with cpu_get_real_ticks().
Signed-off-by: Laurent Vivier <address@hidden>
---
linux-user/main.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/linux-user/main.c b/linux-user/main.c
index 47ab017..9879370 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -1424,8 +1424,7 @@ void cpu_loop (CPUSPARCState *env)
#ifdef TARGET_PPC
static inline uint64_t cpu_ppc_get_tb(CPUPPCState *env)
{
- /* TO FIX */
- return 0;
+ return cpu_get_real_ticks();
}
uint64_t cpu_ppc_load_tbl(CPUPPCState *env)
--
2.4.3
- [Qemu-ppc] [PATCH] linux-user, ppc: mftbl can be used by user application,
Laurent Vivier <=